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[emacs.git] / src / window.c
blob562f471de36f0d6248350933264a69823790b5de
1 /* Window creation, deletion and examination for GNU Emacs.
2 Does not include redisplay.
3 Copyright (C) 1985, 1986, 1987, 1993, 1994, 1995, 1996, 1997, 1998, 2000,
4 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
6 This file is part of GNU Emacs.
8 GNU Emacs is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
11 any later version.
13 GNU Emacs is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GNU Emacs; see the file COPYING. If not, write to
20 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
23 #include <config.h>
24 #include "lisp.h"
25 #include "buffer.h"
26 #include "keyboard.h"
27 #include "keymap.h"
28 #include "frame.h"
29 #include "window.h"
30 #include "commands.h"
31 #include "indent.h"
32 #include "termchar.h"
33 #include "disptab.h"
34 #include "dispextern.h"
35 #include "blockinput.h"
36 #include "intervals.h"
38 #ifdef HAVE_X_WINDOWS
39 #include "xterm.h"
40 #endif /* HAVE_X_WINDOWS */
41 #ifdef WINDOWSNT
42 #include "w32term.h"
43 #endif
44 #ifdef MSDOS
45 #include "msdos.h"
46 #endif
47 #ifdef MAC_OS
48 #include "macterm.h"
49 #endif
52 Lisp_Object Qwindowp, Qwindow_live_p, Qwindow_configuration_p;
53 Lisp_Object Qscroll_up, Qscroll_down;
54 Lisp_Object Qwindow_size_fixed;
55 extern Lisp_Object Qleft_margin, Qright_margin;
57 static int displayed_window_lines P_ ((struct window *));
58 static struct window *decode_window P_ ((Lisp_Object));
59 static int count_windows P_ ((struct window *));
60 static int get_leaf_windows P_ ((struct window *, struct window **, int));
61 static void window_scroll P_ ((Lisp_Object, int, int, int));
62 static void window_scroll_pixel_based P_ ((Lisp_Object, int, int, int));
63 static void window_scroll_line_based P_ ((Lisp_Object, int, int, int));
64 static int window_min_size_1 P_ ((struct window *, int));
65 static int window_min_size P_ ((struct window *, int, int, int *));
66 static void size_window P_ ((Lisp_Object, int, int, int, int, int));
67 static int freeze_window_start P_ ((struct window *, void *));
68 static int window_fixed_size_p P_ ((struct window *, int, int));
69 static void enlarge_window P_ ((Lisp_Object, int, int));
70 static Lisp_Object window_list P_ ((void));
71 static int add_window_to_list P_ ((struct window *, void *));
72 static int candidate_window_p P_ ((Lisp_Object, Lisp_Object, Lisp_Object,
73 Lisp_Object));
74 static Lisp_Object next_window P_ ((Lisp_Object, Lisp_Object,
75 Lisp_Object, int));
76 static void decode_next_window_args P_ ((Lisp_Object *, Lisp_Object *,
77 Lisp_Object *));
78 static int foreach_window_1 P_ ((struct window *,
79 int (* fn) (struct window *, void *),
80 void *));
81 static Lisp_Object window_list_1 P_ ((Lisp_Object, Lisp_Object, Lisp_Object));
83 /* This is the window in which the terminal's cursor should
84 be left when nothing is being done with it. This must
85 always be a leaf window, and its buffer is selected by
86 the top level editing loop at the end of each command.
88 This value is always the same as
89 FRAME_SELECTED_WINDOW (selected_frame). */
91 Lisp_Object selected_window;
93 /* A list of all windows for use by next_window and Fwindow_list.
94 Functions creating or deleting windows should invalidate this cache
95 by setting it to nil. */
97 Lisp_Object Vwindow_list;
99 /* The mini-buffer window of the selected frame.
100 Note that you cannot test for mini-bufferness of an arbitrary window
101 by comparing against this; but you can test for mini-bufferness of
102 the selected window. */
104 Lisp_Object minibuf_window;
106 /* Non-nil means it is the window whose mode line should be
107 shown as the selected window when the minibuffer is selected. */
109 Lisp_Object minibuf_selected_window;
111 /* Non-nil means it is the window for C-M-v to scroll
112 when the mini-buffer is selected. */
114 Lisp_Object Vminibuf_scroll_window;
116 /* Non-nil means this is the buffer whose window C-M-v should scroll. */
118 Lisp_Object Vother_window_scroll_buffer;
120 /* Non-nil means it's function to call to display temp buffers. */
122 Lisp_Object Vtemp_buffer_show_function;
124 /* Non-zero means line and page scrolling on tall lines (with images)
125 does partial scrolling by modifying window-vscroll. */
127 int auto_window_vscroll_p;
129 /* Non-zero means to use mode-line-inactive face in all windows but the
130 selected-window and the minibuffer-scroll-window when the
131 minibuffer is active. */
132 int mode_line_in_non_selected_windows;
134 /* If a window gets smaller than either of these, it is removed. */
136 EMACS_INT window_min_height;
137 EMACS_INT window_min_width;
139 /* Nonzero implies Fdisplay_buffer should create windows. */
141 int pop_up_windows;
143 /* Nonzero implies make new frames for Fdisplay_buffer. */
145 int pop_up_frames;
147 /* Nonzero means reuse existing frames for displaying buffers. */
149 int display_buffer_reuse_frames;
151 /* Non-nil means use this function instead of default */
153 Lisp_Object Vpop_up_frame_function;
155 /* Function to call to handle Fdisplay_buffer. */
157 Lisp_Object Vdisplay_buffer_function;
159 /* Non-nil means that Fdisplay_buffer should even the heights of windows. */
161 Lisp_Object Veven_window_heights;
163 /* List of buffer *names* for buffers that should have their own frames. */
165 Lisp_Object Vspecial_display_buffer_names;
167 /* List of regexps for buffer names that should have their own frames. */
169 Lisp_Object Vspecial_display_regexps;
171 /* Function to pop up a special frame. */
173 Lisp_Object Vspecial_display_function;
175 /* List of buffer *names* for buffers to appear in selected window. */
177 Lisp_Object Vsame_window_buffer_names;
179 /* List of regexps for buffer names to appear in selected window. */
181 Lisp_Object Vsame_window_regexps;
183 /* Hook run at end of temp_output_buffer_show. */
185 Lisp_Object Qtemp_buffer_show_hook;
187 /* Fdisplay_buffer always splits the largest window
188 if that window is more than this high. */
190 EMACS_INT split_height_threshold;
192 /* Number of lines of continuity in scrolling by screenfuls. */
194 EMACS_INT next_screen_context_lines;
196 /* Incremented for each window created. */
198 static int sequence_number;
200 /* Nonzero after init_window_once has finished. */
202 static int window_initialized;
204 /* Hook to run when window config changes. */
206 Lisp_Object Qwindow_configuration_change_hook;
207 Lisp_Object Vwindow_configuration_change_hook;
209 /* Non-nil means scroll commands try to put point
210 at the same screen height as previously. */
212 Lisp_Object Vscroll_preserve_screen_position;
214 /* Incremented by 1 whenever a window is deleted. */
216 int window_deletion_count;
218 /* Used by the function window_scroll_pixel_based */
220 static int window_scroll_pixel_based_preserve_y;
222 #if 0 /* This isn't used anywhere. */
223 /* Nonzero means we can split a frame even if it is "unsplittable". */
224 static int inhibit_frame_unsplittable;
225 #endif /* 0 */
227 extern EMACS_INT scroll_margin;
229 extern Lisp_Object Qwindow_scroll_functions, Vwindow_scroll_functions;
231 DEFUN ("windowp", Fwindowp, Swindowp, 1, 1, 0,
232 doc: /* Returns t if OBJECT is a window. */)
233 (object)
234 Lisp_Object object;
236 return WINDOWP (object) ? Qt : Qnil;
239 DEFUN ("window-live-p", Fwindow_live_p, Swindow_live_p, 1, 1, 0,
240 doc: /* Returns t if OBJECT is a window which is currently visible. */)
241 (object)
242 Lisp_Object object;
244 return WINDOW_LIVE_P (object) ? Qt : Qnil;
247 Lisp_Object
248 make_window ()
250 Lisp_Object val;
251 register struct window *p;
253 p = allocate_window ();
254 ++sequence_number;
255 XSETFASTINT (p->sequence_number, sequence_number);
256 XSETFASTINT (p->left_col, 0);
257 XSETFASTINT (p->top_line, 0);
258 XSETFASTINT (p->total_lines, 0);
259 XSETFASTINT (p->total_cols, 0);
260 XSETFASTINT (p->hscroll, 0);
261 XSETFASTINT (p->min_hscroll, 0);
262 p->orig_top_line = p->orig_total_lines = Qnil;
263 p->start = Fmake_marker ();
264 p->pointm = Fmake_marker ();
265 XSETFASTINT (p->use_time, 0);
266 p->frame = Qnil;
267 p->display_table = Qnil;
268 p->dedicated = Qnil;
269 p->pseudo_window_p = 0;
270 bzero (&p->cursor, sizeof (p->cursor));
271 bzero (&p->last_cursor, sizeof (p->last_cursor));
272 bzero (&p->phys_cursor, sizeof (p->phys_cursor));
273 p->desired_matrix = p->current_matrix = 0;
274 p->nrows_scale_factor = p->ncols_scale_factor = 1;
275 p->phys_cursor_type = -1;
276 p->phys_cursor_width = -1;
277 p->must_be_updated_p = 0;
278 XSETFASTINT (p->window_end_vpos, 0);
279 XSETFASTINT (p->window_end_pos, 0);
280 p->window_end_valid = Qnil;
281 p->vscroll = 0;
282 XSETWINDOW (val, p);
283 XSETFASTINT (p->last_point, 0);
284 p->frozen_window_start_p = 0;
285 p->last_cursor_off_p = p->cursor_off_p = 0;
286 p->left_margin_cols = Qnil;
287 p->right_margin_cols = Qnil;
288 p->left_fringe_width = Qnil;
289 p->right_fringe_width = Qnil;
290 p->fringes_outside_margins = Qnil;
291 p->scroll_bar_width = Qnil;
292 p->vertical_scroll_bar_type = Qt;
294 Vwindow_list = Qnil;
295 return val;
298 DEFUN ("selected-window", Fselected_window, Sselected_window, 0, 0, 0,
299 doc: /* Return the window that the cursor now appears in and commands apply to. */)
302 return selected_window;
305 DEFUN ("minibuffer-window", Fminibuffer_window, Sminibuffer_window, 0, 1, 0,
306 doc: /* Return the window used now for minibuffers.
307 If the optional argument FRAME is specified, return the minibuffer window
308 used by that frame. */)
309 (frame)
310 Lisp_Object frame;
312 if (NILP (frame))
313 frame = selected_frame;
314 CHECK_LIVE_FRAME (frame);
315 return FRAME_MINIBUF_WINDOW (XFRAME (frame));
318 DEFUN ("window-minibuffer-p", Fwindow_minibuffer_p, Swindow_minibuffer_p, 0, 1, 0,
319 doc: /* Returns non-nil if WINDOW is a minibuffer window.
320 WINDOW defaults to the selected window. */)
321 (window)
322 Lisp_Object window;
324 struct window *w = decode_window (window);
325 return MINI_WINDOW_P (w) ? Qt : Qnil;
329 DEFUN ("pos-visible-in-window-p", Fpos_visible_in_window_p,
330 Spos_visible_in_window_p, 0, 3, 0,
331 doc: /* Return non-nil if position POS is currently on the frame in WINDOW.
332 Return nil if that position is scrolled vertically out of view.
333 If a character is only partially visible, nil is returned, unless the
334 optional argument PARTIALLY is non-nil.
335 If POS is only out of view because of horizontal scrolling, return non-nil.
336 If POS is t, it specifies the position of the last visible glyph in WINDOW.
337 POS defaults to point in WINDOW; WINDOW defaults to the selected window.
339 If POS is visible, return t if PARTIALLY is nil; if PARTIALLY is non-nil,
340 return value is a list of 2 or 6 elements (X Y [RTOP RBOT ROWH VPOS]),
341 where X and Y are the pixel coordinates relative to the top left corner
342 of the window. The remaining elements are omitted if the character after
343 POS is fully visible; otherwise, RTOP and RBOT are the number of pixels
344 off-window at the top and bottom of the row, ROWH is the height of the
345 display row, and VPOS is the row number (0-based) containing POS. */)
346 (pos, window, partially)
347 Lisp_Object pos, window, partially;
349 register struct window *w;
350 register int posint;
351 register struct buffer *buf;
352 struct text_pos top;
353 Lisp_Object in_window = Qnil;
354 int rtop, rbot, rowh, vpos, fully_p = 1;
355 int x, y;
357 w = decode_window (window);
358 buf = XBUFFER (w->buffer);
359 SET_TEXT_POS_FROM_MARKER (top, w->start);
361 if (EQ (pos, Qt))
362 posint = -1;
363 else if (!NILP (pos))
365 CHECK_NUMBER_COERCE_MARKER (pos);
366 posint = XINT (pos);
368 else if (w == XWINDOW (selected_window))
369 posint = PT;
370 else
371 posint = XMARKER (w->pointm)->charpos;
373 /* If position is above window start or outside buffer boundaries,
374 or if window start is out of range, position is not visible. */
375 if ((EQ (pos, Qt)
376 || (posint >= CHARPOS (top) && posint <= BUF_ZV (buf)))
377 && CHARPOS (top) >= BUF_BEGV (buf)
378 && CHARPOS (top) <= BUF_ZV (buf)
379 && pos_visible_p (w, posint, &x, &y, &rtop, &rbot, &rowh, &vpos)
380 && (fully_p = !rtop && !rbot, (!NILP (partially) || fully_p)))
381 in_window = Qt;
383 if (!NILP (in_window) && !NILP (partially))
385 Lisp_Object part = Qnil;
386 if (!fully_p)
387 part = list4 (make_number (rtop), make_number (rbot),
388 make_number (rowh), make_number (vpos));
389 in_window = Fcons (make_number (x),
390 Fcons (make_number (y), part));
393 return in_window;
396 DEFUN ("window-line-height", Fwindow_line_height,
397 Swindow_line_height, 0, 2, 0,
398 doc: /* Return height in pixels of text line LINE in window WINDOW.
399 If WINDOW is nil or omitted, use selected window.
401 Return height of current line if LINE is omitted or nil. Return height of
402 header or mode line if LINE is `header-line' and `mode-line'.
403 Otherwise, LINE is a text line number starting from 0. A negative number
404 counts from the end of the window.
406 Value is a list (HEIGHT VPOS YPOS OFFBOT), where HEIGHT is the height
407 in pixels of the visible part of the line, VPOS and YPOS are the
408 vertical position in lines and pixels of the line, relative to the top
409 of the first text line, and OFFBOT is the number of off-window pixels at
410 the bottom of the text line. If there are off-window pixels at the top
411 of the (first) text line, YPOS is negative.
413 Return nil if window display is not up-to-date. In that case, use
414 `pos-visible-in-window-p' to obtain the information. */)
415 (line, window)
416 Lisp_Object line, window;
418 register struct window *w;
419 register struct buffer *b;
420 struct glyph_row *row, *end_row;
421 int max_y, crop, i, n;
423 w = decode_window (window);
425 if (noninteractive
426 || w->pseudo_window_p)
427 return Qnil;
429 CHECK_BUFFER (w->buffer);
430 b = XBUFFER (w->buffer);
432 /* Fail if current matrix is not up-to-date. */
433 if (NILP (w->window_end_valid)
434 || current_buffer->clip_changed
435 || current_buffer->prevent_redisplay_optimizations_p
436 || XFASTINT (w->last_modified) < BUF_MODIFF (b)
437 || XFASTINT (w->last_overlay_modified) < BUF_OVERLAY_MODIFF (b))
438 return Qnil;
440 if (NILP (line))
442 i = w->cursor.vpos;
443 if (i < 0 || i >= w->current_matrix->nrows
444 || (row = MATRIX_ROW (w->current_matrix, i), !row->enabled_p))
445 return Qnil;
446 max_y = window_text_bottom_y (w);
447 goto found_row;
450 if (EQ (line, Qheader_line))
452 if (!WINDOW_WANTS_HEADER_LINE_P (w))
453 return Qnil;
454 row = MATRIX_HEADER_LINE_ROW (w->current_matrix);
455 if (!row->enabled_p)
456 return Qnil;
457 return list4 (make_number (row->height),
458 make_number (0), make_number (0),
459 make_number (0));
462 if (EQ (line, Qmode_line))
464 row = MATRIX_MODE_LINE_ROW (w->current_matrix);
465 if (!row->enabled_p)
466 return Qnil;
467 return list4 (make_number (row->height),
468 make_number (0), /* not accurate */
469 make_number (WINDOW_HEADER_LINE_HEIGHT (w)
470 + window_text_bottom_y (w)),
471 make_number (0));
474 CHECK_NUMBER (line);
475 n = XINT (line);
477 row = MATRIX_FIRST_TEXT_ROW (w->current_matrix);
478 end_row = MATRIX_BOTTOM_TEXT_ROW (w->current_matrix, w);
479 max_y = window_text_bottom_y (w);
480 i = 0;
482 while ((n < 0 || i < n)
483 && row <= end_row && row->enabled_p
484 && row->y + row->height < max_y)
485 row++, i++;
487 if (row > end_row || !row->enabled_p)
488 return Qnil;
490 if (++n < 0)
492 if (-n > i)
493 return Qnil;
494 row += n;
495 i += n;
498 found_row:
499 crop = max (0, (row->y + row->height) - max_y);
500 return list4 (make_number (row->height + min (0, row->y) - crop),
501 make_number (i),
502 make_number (row->y),
503 make_number (crop));
508 static struct window *
509 decode_window (window)
510 register Lisp_Object window;
512 if (NILP (window))
513 return XWINDOW (selected_window);
515 CHECK_LIVE_WINDOW (window);
516 return XWINDOW (window);
519 static struct window *
520 decode_any_window (window)
521 register Lisp_Object window;
523 if (NILP (window))
524 return XWINDOW (selected_window);
526 CHECK_WINDOW (window);
527 return XWINDOW (window);
530 DEFUN ("window-buffer", Fwindow_buffer, Swindow_buffer, 0, 1, 0,
531 doc: /* Return the buffer that WINDOW is displaying.
532 WINDOW defaults to the selected window. */)
533 (window)
534 Lisp_Object window;
536 return decode_window (window)->buffer;
539 DEFUN ("window-height", Fwindow_height, Swindow_height, 0, 1, 0,
540 doc: /* Return the number of lines in WINDOW (including its mode line).
541 WINDOW defaults to the selected window. */)
542 (window)
543 Lisp_Object window;
545 return decode_any_window (window)->total_lines;
548 DEFUN ("window-width", Fwindow_width, Swindow_width, 0, 1, 0,
549 doc: /* Return the number of display columns in WINDOW.
550 This is the width that is usable columns available for text in WINDOW.
551 If you want to find out how many columns WINDOW takes up,
552 use (let ((edges (window-edges))) (- (nth 2 edges) (nth 0 edges))). */)
553 (window)
554 Lisp_Object window;
556 return make_number (window_box_text_cols (decode_any_window (window)));
559 DEFUN ("window-hscroll", Fwindow_hscroll, Swindow_hscroll, 0, 1, 0,
560 doc: /* Return the number of columns by which WINDOW is scrolled from left margin.
561 WINDOW defaults to the selected window. */)
562 (window)
563 Lisp_Object window;
565 return decode_window (window)->hscroll;
568 DEFUN ("set-window-hscroll", Fset_window_hscroll, Sset_window_hscroll, 2, 2, 0,
569 doc: /* Set number of columns WINDOW is scrolled from left margin to NCOL.
570 Return NCOL. NCOL should be zero or positive.
572 Note that if `automatic-hscrolling' is non-nil, you cannot scroll the
573 window so that the location of point moves off-window. */)
574 (window, ncol)
575 Lisp_Object window, ncol;
577 struct window *w = decode_window (window);
578 int hscroll;
580 CHECK_NUMBER (ncol);
581 hscroll = max (0, XINT (ncol));
583 /* Prevent redisplay shortcuts when changing the hscroll. */
584 if (XINT (w->hscroll) != hscroll)
585 XBUFFER (w->buffer)->prevent_redisplay_optimizations_p = 1;
587 w->hscroll = make_number (hscroll);
588 return ncol;
591 DEFUN ("window-redisplay-end-trigger", Fwindow_redisplay_end_trigger,
592 Swindow_redisplay_end_trigger, 0, 1, 0,
593 doc: /* Return WINDOW's redisplay end trigger value.
594 WINDOW defaults to the selected window.
595 See `set-window-redisplay-end-trigger' for more information. */)
596 (window)
597 Lisp_Object window;
599 return decode_window (window)->redisplay_end_trigger;
602 DEFUN ("set-window-redisplay-end-trigger", Fset_window_redisplay_end_trigger,
603 Sset_window_redisplay_end_trigger, 2, 2, 0,
604 doc: /* Set WINDOW's redisplay end trigger value to VALUE.
605 VALUE should be a buffer position (typically a marker) or nil.
606 If it is a buffer position, then if redisplay in WINDOW reaches a position
607 beyond VALUE, the functions in `redisplay-end-trigger-functions' are called
608 with two arguments: WINDOW, and the end trigger value.
609 Afterwards the end-trigger value is reset to nil. */)
610 (window, value)
611 register Lisp_Object window, value;
613 register struct window *w;
615 w = decode_window (window);
616 w->redisplay_end_trigger = value;
617 return value;
620 DEFUN ("window-edges", Fwindow_edges, Swindow_edges, 0, 1, 0,
621 doc: /* Return a list of the edge coordinates of WINDOW.
622 \(LEFT TOP RIGHT BOTTOM), all relative to 0, 0 at top left corner of frame.
623 RIGHT is one more than the rightmost column occupied by WINDOW,
624 and BOTTOM is one more than the bottommost row occupied by WINDOW.
625 The edges include the space used by the window's scroll bar,
626 display margins, fringes, header line, and mode line, if it has them.
627 To get the edges of the actual text area, use `window-inside-edges'. */)
628 (window)
629 Lisp_Object window;
631 register struct window *w = decode_any_window (window);
633 return Fcons (make_number (WINDOW_LEFT_EDGE_COL (w)),
634 Fcons (make_number (WINDOW_TOP_EDGE_LINE (w)),
635 Fcons (make_number (WINDOW_RIGHT_EDGE_COL (w)),
636 Fcons (make_number (WINDOW_BOTTOM_EDGE_LINE (w)),
637 Qnil))));
640 DEFUN ("window-pixel-edges", Fwindow_pixel_edges, Swindow_pixel_edges, 0, 1, 0,
641 doc: /* Return a list of the edge pixel coordinates of WINDOW.
642 \(LEFT TOP RIGHT BOTTOM), all relative to 0, 0 at top left corner of frame.
643 RIGHT is one more than the rightmost x position occupied by WINDOW,
644 and BOTTOM is one more than the bottommost y position occupied by WINDOW.
645 The pixel edges include the space used by the window's scroll bar,
646 display margins, fringes, header line, and mode line, if it has them.
647 To get the edges of the actual text area, use `window-inside-pixel-edges'. */)
648 (window)
649 Lisp_Object window;
651 register struct window *w = decode_any_window (window);
653 return Fcons (make_number (WINDOW_LEFT_EDGE_X (w)),
654 Fcons (make_number (WINDOW_TOP_EDGE_Y (w)),
655 Fcons (make_number (WINDOW_RIGHT_EDGE_X (w)),
656 Fcons (make_number (WINDOW_BOTTOM_EDGE_Y (w)),
657 Qnil))));
660 DEFUN ("window-inside-edges", Fwindow_inside_edges, Swindow_inside_edges, 0, 1, 0,
661 doc: /* Return a list of the edge coordinates of WINDOW.
662 \(LEFT TOP RIGHT BOTTOM), all relative to 0, 0 at top left corner of frame.
663 RIGHT is one more than the rightmost column used by text in WINDOW,
664 and BOTTOM is one more than the bottommost row used by text in WINDOW.
665 The inside edges do not include the space used by the window's scroll bar,
666 display margins, fringes, header line, and/or mode line. */)
667 (window)
668 Lisp_Object window;
670 register struct window *w = decode_any_window (window);
672 return list4 (make_number (WINDOW_BOX_LEFT_EDGE_COL (w)
673 + WINDOW_LEFT_MARGIN_COLS (w)
674 + WINDOW_LEFT_FRINGE_COLS (w)),
675 make_number (WINDOW_TOP_EDGE_LINE (w)
676 + WINDOW_HEADER_LINE_LINES (w)),
677 make_number (WINDOW_BOX_RIGHT_EDGE_COL (w)
678 - WINDOW_RIGHT_MARGIN_COLS (w)
679 - WINDOW_RIGHT_FRINGE_COLS (w)),
680 make_number (WINDOW_BOTTOM_EDGE_LINE (w)
681 - WINDOW_MODE_LINE_LINES (w)));
684 DEFUN ("window-inside-pixel-edges", Fwindow_inside_pixel_edges, Swindow_inside_pixel_edges, 0, 1, 0,
685 doc: /* Return a list of the edge pixel coordinates of WINDOW.
686 \(LEFT TOP RIGHT BOTTOM), all relative to 0, 0 at top left corner of frame.
687 RIGHT is one more than the rightmost x position used by text in WINDOW,
688 and BOTTOM is one more than the bottommost y position used by text in WINDOW.
689 The inside edges do not include the space used by the window's scroll bar,
690 display margins, fringes, header line, and/or mode line. */)
691 (window)
692 Lisp_Object window;
694 register struct window *w = decode_any_window (window);
696 return list4 (make_number (WINDOW_BOX_LEFT_EDGE_X (w)
697 + WINDOW_LEFT_MARGIN_WIDTH (w)
698 + WINDOW_LEFT_FRINGE_WIDTH (w)),
699 make_number (WINDOW_TOP_EDGE_Y (w)
700 + WINDOW_HEADER_LINE_HEIGHT (w)),
701 make_number (WINDOW_BOX_RIGHT_EDGE_X (w)
702 - WINDOW_RIGHT_MARGIN_WIDTH (w)
703 - WINDOW_RIGHT_FRINGE_WIDTH (w)),
704 make_number (WINDOW_BOTTOM_EDGE_Y (w)
705 - WINDOW_MODE_LINE_HEIGHT (w)));
708 /* Test if the character at column *X, row *Y is within window W.
709 If it is not, return ON_NOTHING;
710 if it is in the window's text area,
711 set *x and *y to its location relative to the upper left corner
712 of the window, and
713 return ON_TEXT;
714 if it is on the window's modeline, return ON_MODE_LINE;
715 if it is on the border between the window and its right sibling,
716 return ON_VERTICAL_BORDER.
717 if it is on a scroll bar,
718 return ON_SCROLL_BAR.
719 if it is on the window's top line, return ON_HEADER_LINE;
720 if it is in left or right fringe of the window,
721 return ON_LEFT_FRINGE or ON_RIGHT_FRINGE, and convert *X and *Y
722 to window-relative coordinates;
723 if it is in the marginal area to the left/right of the window,
724 return ON_LEFT_MARGIN or ON_RIGHT_MARGIN, and convert *X and *Y
725 to window-relative coordinates.
727 X and Y are frame relative pixel coordinates. */
729 static enum window_part
730 coordinates_in_window (w, x, y)
731 register struct window *w;
732 register int *x, *y;
734 struct frame *f = XFRAME (WINDOW_FRAME (w));
735 int left_x, right_x, top_y, bottom_y;
736 enum window_part part;
737 int ux = FRAME_COLUMN_WIDTH (f);
738 int x0 = WINDOW_LEFT_EDGE_X (w);
739 int x1 = WINDOW_RIGHT_EDGE_X (w);
740 /* The width of the area where the vertical line can be dragged.
741 (Between mode lines for instance. */
742 int grabbable_width = ux;
743 int lmargin_width, rmargin_width, text_left, text_right;
745 /* In what's below, we subtract 1 when computing right_x because we
746 want the rightmost pixel, which is given by left_pixel+width-1. */
747 if (w->pseudo_window_p)
749 left_x = 0;
750 right_x = WINDOW_TOTAL_WIDTH (w) - 1;
751 top_y = WINDOW_TOP_EDGE_Y (w);
752 bottom_y = WINDOW_BOTTOM_EDGE_Y (w);
754 else
756 left_x = WINDOW_BOX_LEFT_EDGE_X (w);
757 right_x = WINDOW_BOX_RIGHT_EDGE_X (w) - 1;
758 top_y = WINDOW_TOP_EDGE_Y (w);
759 bottom_y = WINDOW_BOTTOM_EDGE_Y (w);
762 /* Outside any interesting row? */
763 if (*y < top_y || *y >= bottom_y)
764 return ON_NOTHING;
766 /* On the mode line or header line? If it's near the start of
767 the mode or header line of window that's has a horizontal
768 sibling, say it's on the vertical line. That's to be able
769 to resize windows horizontally in case we're using toolkit
770 scroll bars. */
772 if (WINDOW_WANTS_MODELINE_P (w)
773 && *y >= bottom_y - CURRENT_MODE_LINE_HEIGHT (w))
775 part = ON_MODE_LINE;
777 header_vertical_border_check:
778 /* We're somewhere on the mode line. We consider the place
779 between mode lines of horizontally adjacent mode lines
780 as the vertical border. If scroll bars on the left,
781 return the right window. */
782 if (WINDOW_HAS_VERTICAL_SCROLL_BAR_ON_LEFT (w)
783 || WINDOW_RIGHTMOST_P (w))
785 if (!WINDOW_LEFTMOST_P (w) && abs (*x - x0) < grabbable_width)
787 /* Convert X and Y to window relative coordinates.
788 Vertical border is at the left edge of window. */
789 *x = max (0, *x - x0);
790 *y -= top_y;
791 return ON_VERTICAL_BORDER;
794 else
796 if (abs (*x - x1) < grabbable_width)
798 /* Convert X and Y to window relative coordinates.
799 Vertical border is at the right edge of window. */
800 *x = min (x1, *x) - x0;
801 *y -= top_y;
802 return ON_VERTICAL_BORDER;
806 if (*x < x0 || *x >= x1)
807 return ON_NOTHING;
809 /* Convert X and Y to window relative coordinates.
810 Mode line starts at left edge of window. */
811 *x -= x0;
812 *y -= top_y;
813 return part;
816 if (WINDOW_WANTS_HEADER_LINE_P (w)
817 && *y < top_y + CURRENT_HEADER_LINE_HEIGHT (w))
819 part = ON_HEADER_LINE;
820 goto header_vertical_border_check;
823 if (*x < x0 || *x >= x1)
824 return ON_NOTHING;
826 /* Outside any interesting column? */
827 if (*x < left_x || *x > right_x)
829 *y -= top_y;
830 return ON_SCROLL_BAR;
833 lmargin_width = window_box_width (w, LEFT_MARGIN_AREA);
834 rmargin_width = window_box_width (w, RIGHT_MARGIN_AREA);
836 text_left = window_box_left (w, TEXT_AREA);
837 text_right = text_left + window_box_width (w, TEXT_AREA);
839 if (FRAME_WINDOW_P (f))
841 if (!w->pseudo_window_p
842 && !WINDOW_HAS_VERTICAL_SCROLL_BAR (w)
843 && !WINDOW_RIGHTMOST_P (w)
844 && (abs (*x - right_x) < grabbable_width))
846 /* Convert X and Y to window relative coordinates.
847 Vertical border is at the right edge of window. */
848 *x = min (right_x, *x) - left_x;
849 *y -= top_y;
850 return ON_VERTICAL_BORDER;
853 else
855 /* Need to say "*x > right_x" rather than >=, since on character
856 terminals, the vertical line's x coordinate is right_x. */
857 if (!w->pseudo_window_p
858 && !WINDOW_RIGHTMOST_P (w)
859 && *x > right_x - ux)
861 /* On the border on the right side of the window? Assume that
862 this area begins at RIGHT_X minus a canonical char width. */
863 *x = min (right_x, *x) - left_x;
864 *y -= top_y;
865 return ON_VERTICAL_BORDER;
869 if (*x < text_left)
871 if (lmargin_width > 0
872 && (WINDOW_HAS_FRINGES_OUTSIDE_MARGINS (w)
873 ? (*x >= left_x + WINDOW_LEFT_FRINGE_WIDTH (w))
874 : (*x < left_x + lmargin_width)))
876 *x -= left_x;
877 if (WINDOW_HAS_FRINGES_OUTSIDE_MARGINS (w))
878 *x -= WINDOW_LEFT_FRINGE_WIDTH (w);
879 *y -= top_y;
880 return ON_LEFT_MARGIN;
883 /* Convert X and Y to window-relative pixel coordinates. */
884 *x -= left_x;
885 *y -= top_y;
886 return ON_LEFT_FRINGE;
889 if (*x >= text_right)
891 if (rmargin_width > 0
892 && (WINDOW_HAS_FRINGES_OUTSIDE_MARGINS (w)
893 ? (*x < right_x - WINDOW_RIGHT_FRINGE_WIDTH (w))
894 : (*x >= right_x - rmargin_width)))
896 *x -= right_x - rmargin_width;
897 if (WINDOW_HAS_FRINGES_OUTSIDE_MARGINS (w))
898 *x += WINDOW_RIGHT_FRINGE_WIDTH (w);
899 *y -= top_y;
900 return ON_RIGHT_MARGIN;
903 /* Convert X and Y to window-relative pixel coordinates. */
904 *x -= left_x + WINDOW_LEFT_FRINGE_WIDTH (w);
905 *y -= top_y;
906 return ON_RIGHT_FRINGE;
909 /* Everything special ruled out - must be on text area */
910 *x -= text_left;
911 *y -= top_y;
912 return ON_TEXT;
916 DEFUN ("coordinates-in-window-p", Fcoordinates_in_window_p,
917 Scoordinates_in_window_p, 2, 2, 0,
918 doc: /* Return non-nil if COORDINATES are in WINDOW.
919 COORDINATES is a cons of the form (X . Y), X and Y being distances
920 measured in characters from the upper-left corner of the frame.
921 \(0 . 0) denotes the character in the upper left corner of the
922 frame.
923 If COORDINATES are in the text portion of WINDOW,
924 the coordinates relative to the window are returned.
925 If they are in the mode line of WINDOW, `mode-line' is returned.
926 If they are in the top mode line of WINDOW, `header-line' is returned.
927 If they are in the left fringe of WINDOW, `left-fringe' is returned.
928 If they are in the right fringe of WINDOW, `right-fringe' is returned.
929 If they are on the border between WINDOW and its right sibling,
930 `vertical-line' is returned.
931 If they are in the windows's left or right marginal areas, `left-margin'\n\
932 or `right-margin' is returned. */)
933 (coordinates, window)
934 register Lisp_Object coordinates, window;
936 struct window *w;
937 struct frame *f;
938 int x, y;
939 Lisp_Object lx, ly;
941 CHECK_WINDOW (window);
942 w = XWINDOW (window);
943 f = XFRAME (w->frame);
944 CHECK_CONS (coordinates);
945 lx = Fcar (coordinates);
946 ly = Fcdr (coordinates);
947 CHECK_NUMBER_OR_FLOAT (lx);
948 CHECK_NUMBER_OR_FLOAT (ly);
949 x = FRAME_PIXEL_X_FROM_CANON_X (f, lx) + FRAME_INTERNAL_BORDER_WIDTH (f);
950 y = FRAME_PIXEL_Y_FROM_CANON_Y (f, ly) + FRAME_INTERNAL_BORDER_WIDTH (f);
952 switch (coordinates_in_window (w, &x, &y))
954 case ON_NOTHING:
955 return Qnil;
957 case ON_TEXT:
958 /* X and Y are now window relative pixel coordinates. Convert
959 them to canonical char units before returning them. */
960 return Fcons (FRAME_CANON_X_FROM_PIXEL_X (f, x),
961 FRAME_CANON_Y_FROM_PIXEL_Y (f, y));
963 case ON_MODE_LINE:
964 return Qmode_line;
966 case ON_VERTICAL_BORDER:
967 return Qvertical_line;
969 case ON_HEADER_LINE:
970 return Qheader_line;
972 case ON_LEFT_FRINGE:
973 return Qleft_fringe;
975 case ON_RIGHT_FRINGE:
976 return Qright_fringe;
978 case ON_LEFT_MARGIN:
979 return Qleft_margin;
981 case ON_RIGHT_MARGIN:
982 return Qright_margin;
984 case ON_SCROLL_BAR:
985 /* Historically we are supposed to return nil in this case. */
986 return Qnil;
988 default:
989 abort ();
994 /* Callback for foreach_window, used in window_from_coordinates.
995 Check if window W contains coordinates specified by USER_DATA which
996 is actually a pointer to a struct check_window_data CW.
998 Check if window W contains coordinates *CW->x and *CW->y. If it
999 does, return W in *CW->window, as Lisp_Object, and return in
1000 *CW->part the part of the window under coordinates *X,*Y. Return
1001 zero from this function to stop iterating over windows. */
1003 struct check_window_data
1005 Lisp_Object *window;
1006 int *x, *y;
1007 enum window_part *part;
1010 static int
1011 check_window_containing (w, user_data)
1012 struct window *w;
1013 void *user_data;
1015 struct check_window_data *cw = (struct check_window_data *) user_data;
1016 enum window_part found;
1017 int continue_p = 1;
1019 found = coordinates_in_window (w, cw->x, cw->y);
1020 if (found != ON_NOTHING)
1022 *cw->part = found;
1023 XSETWINDOW (*cw->window, w);
1024 continue_p = 0;
1027 return continue_p;
1031 /* Find the window containing frame-relative pixel position X/Y and
1032 return it as a Lisp_Object.
1034 If X, Y is on one of the window's special `window_part' elements,
1035 set *PART to the id of that element, and return X and Y converted
1036 to window relative coordinates in WX and WY.
1038 If there is no window under X, Y return nil and leave *PART
1039 unmodified. TOOL_BAR_P non-zero means detect tool-bar windows.
1041 This function was previously implemented with a loop cycling over
1042 windows with Fnext_window, and starting with the frame's selected
1043 window. It turned out that this doesn't work with an
1044 implementation of next_window using Vwindow_list, because
1045 FRAME_SELECTED_WINDOW (F) is not always contained in the window
1046 tree of F when this function is called asynchronously from
1047 note_mouse_highlight. The original loop didn't terminate in this
1048 case. */
1050 Lisp_Object
1051 window_from_coordinates (f, x, y, part, wx, wy, tool_bar_p)
1052 struct frame *f;
1053 int x, y;
1054 enum window_part *part;
1055 int *wx, *wy;
1056 int tool_bar_p;
1058 Lisp_Object window;
1059 struct check_window_data cw;
1060 enum window_part dummy;
1062 if (part == 0)
1063 part = &dummy;
1065 window = Qnil;
1066 cw.window = &window, cw.x = &x, cw.y = &y; cw.part = part;
1067 foreach_window (f, check_window_containing, &cw);
1069 /* If not found above, see if it's in the tool bar window, if a tool
1070 bar exists. */
1071 if (NILP (window)
1072 && tool_bar_p
1073 && WINDOWP (f->tool_bar_window)
1074 && WINDOW_TOTAL_LINES (XWINDOW (f->tool_bar_window)) > 0
1075 && (coordinates_in_window (XWINDOW (f->tool_bar_window), &x, &y)
1076 != ON_NOTHING))
1078 *part = ON_TEXT;
1079 window = f->tool_bar_window;
1082 if (wx) *wx = x;
1083 if (wy) *wy = y;
1085 return window;
1088 DEFUN ("window-at", Fwindow_at, Swindow_at, 2, 3, 0,
1089 doc: /* Return window containing coordinates X and Y on FRAME.
1090 If omitted, FRAME defaults to the currently selected frame.
1091 The top left corner of the frame is considered to be row 0,
1092 column 0. */)
1093 (x, y, frame)
1094 Lisp_Object x, y, frame;
1096 struct frame *f;
1098 if (NILP (frame))
1099 frame = selected_frame;
1100 CHECK_LIVE_FRAME (frame);
1101 f = XFRAME (frame);
1103 /* Check that arguments are integers or floats. */
1104 CHECK_NUMBER_OR_FLOAT (x);
1105 CHECK_NUMBER_OR_FLOAT (y);
1107 return window_from_coordinates (f,
1108 (FRAME_PIXEL_X_FROM_CANON_X (f, x)
1109 + FRAME_INTERNAL_BORDER_WIDTH (f)),
1110 (FRAME_PIXEL_Y_FROM_CANON_Y (f, y)
1111 + FRAME_INTERNAL_BORDER_WIDTH (f)),
1112 0, 0, 0, 0);
1115 DEFUN ("window-point", Fwindow_point, Swindow_point, 0, 1, 0,
1116 doc: /* Return current value of point in WINDOW.
1117 WINDOW defaults to the selected window.
1119 For a nonselected window, this is the value point would have
1120 if that window were selected.
1122 Note that, when WINDOW is the selected window and its buffer
1123 is also currently selected, the value returned is the same as (point).
1124 It would be more strictly correct to return the `top-level' value
1125 of point, outside of any save-excursion forms.
1126 But that is hard to define. */)
1127 (window)
1128 Lisp_Object window;
1130 register struct window *w = decode_window (window);
1132 if (w == XWINDOW (selected_window)
1133 && current_buffer == XBUFFER (w->buffer))
1134 return Fpoint ();
1135 return Fmarker_position (w->pointm);
1138 DEFUN ("window-start", Fwindow_start, Swindow_start, 0, 1, 0,
1139 doc: /* Return position at which display currently starts in WINDOW.
1140 WINDOW defaults to the selected window.
1141 This is updated by redisplay or by calling `set-window-start'. */)
1142 (window)
1143 Lisp_Object window;
1145 return Fmarker_position (decode_window (window)->start);
1148 /* This is text temporarily removed from the doc string below.
1150 This function returns nil if the position is not currently known.
1151 That happens when redisplay is preempted and doesn't finish.
1152 If in that case you want to compute where the end of the window would
1153 have been if redisplay had finished, do this:
1154 (save-excursion
1155 (goto-char (window-start window))
1156 (vertical-motion (1- (window-height window)) window)
1157 (point))") */
1159 DEFUN ("window-end", Fwindow_end, Swindow_end, 0, 2, 0,
1160 doc: /* Return position at which display currently ends in WINDOW.
1161 WINDOW defaults to the selected window.
1162 This is updated by redisplay, when it runs to completion.
1163 Simply changing the buffer text or setting `window-start'
1164 does not update this value.
1165 Return nil if there is no recorded value. \(This can happen if the
1166 last redisplay of WINDOW was preempted, and did not finish.)
1167 If UPDATE is non-nil, compute the up-to-date position
1168 if it isn't already recorded. */)
1169 (window, update)
1170 Lisp_Object window, update;
1172 Lisp_Object value;
1173 struct window *w = decode_window (window);
1174 Lisp_Object buf;
1175 struct buffer *b;
1177 buf = w->buffer;
1178 CHECK_BUFFER (buf);
1179 b = XBUFFER (buf);
1181 #if 0 /* This change broke some things. We should make it later. */
1182 /* If we don't know the end position, return nil.
1183 The user can compute it with vertical-motion if he wants to.
1184 It would be nicer to do it automatically,
1185 but that's so slow that it would probably bother people. */
1186 if (NILP (w->window_end_valid))
1187 return Qnil;
1188 #endif
1190 if (! NILP (update)
1191 && ! (! NILP (w->window_end_valid)
1192 && XFASTINT (w->last_modified) >= BUF_MODIFF (b)
1193 && XFASTINT (w->last_overlay_modified) >= BUF_OVERLAY_MODIFF (b))
1194 && !noninteractive)
1196 struct text_pos startp;
1197 struct it it;
1198 struct buffer *old_buffer = NULL;
1200 /* Cannot use Fvertical_motion because that function doesn't
1201 cope with variable-height lines. */
1202 if (b != current_buffer)
1204 old_buffer = current_buffer;
1205 set_buffer_internal (b);
1208 /* In case W->start is out of the range, use something
1209 reasonable. This situation occurred when loading a file with
1210 `-l' containing a call to `rmail' with subsequent other
1211 commands. At the end, W->start happened to be BEG, while
1212 rmail had already narrowed the buffer. */
1213 if (XMARKER (w->start)->charpos < BEGV)
1214 SET_TEXT_POS (startp, BEGV, BEGV_BYTE);
1215 else if (XMARKER (w->start)->charpos > ZV)
1216 SET_TEXT_POS (startp, ZV, ZV_BYTE);
1217 else
1218 SET_TEXT_POS_FROM_MARKER (startp, w->start);
1220 start_display (&it, w, startp);
1221 move_it_vertically (&it, window_box_height (w));
1222 if (it.current_y < it.last_visible_y)
1223 move_it_past_eol (&it);
1224 value = make_number (IT_CHARPOS (it));
1226 if (old_buffer)
1227 set_buffer_internal (old_buffer);
1229 else
1230 XSETINT (value, BUF_Z (b) - XFASTINT (w->window_end_pos));
1232 return value;
1235 DEFUN ("set-window-point", Fset_window_point, Sset_window_point, 2, 2, 0,
1236 doc: /* Make point value in WINDOW be at position POS in WINDOW's buffer.
1237 Return POS. */)
1238 (window, pos)
1239 Lisp_Object window, pos;
1241 register struct window *w = decode_window (window);
1243 CHECK_NUMBER_COERCE_MARKER (pos);
1244 if (w == XWINDOW (selected_window)
1245 && XBUFFER (w->buffer) == current_buffer)
1246 Fgoto_char (pos);
1247 else
1248 set_marker_restricted (w->pointm, pos, w->buffer);
1250 /* We have to make sure that redisplay updates the window to show
1251 the new value of point. */
1252 if (!EQ (window, selected_window))
1253 ++windows_or_buffers_changed;
1255 return pos;
1258 DEFUN ("set-window-start", Fset_window_start, Sset_window_start, 2, 3, 0,
1259 doc: /* Make display in WINDOW start at position POS in WINDOW's buffer.
1260 Return POS.
1261 Optional third arg NOFORCE non-nil inhibits next redisplay
1262 from overriding motion of point in order to display at this exact start. */)
1263 (window, pos, noforce)
1264 Lisp_Object window, pos, noforce;
1266 register struct window *w = decode_window (window);
1268 CHECK_NUMBER_COERCE_MARKER (pos);
1269 set_marker_restricted (w->start, pos, w->buffer);
1270 /* this is not right, but much easier than doing what is right. */
1271 w->start_at_line_beg = Qnil;
1272 if (NILP (noforce))
1273 w->force_start = Qt;
1274 w->update_mode_line = Qt;
1275 XSETFASTINT (w->last_modified, 0);
1276 XSETFASTINT (w->last_overlay_modified, 0);
1277 if (!EQ (window, selected_window))
1278 windows_or_buffers_changed++;
1280 return pos;
1283 DEFUN ("window-dedicated-p", Fwindow_dedicated_p, Swindow_dedicated_p,
1284 1, 1, 0,
1285 doc: /* Return WINDOW's dedicated object, usually t or nil.
1286 See also `set-window-dedicated-p'. */)
1287 (window)
1288 Lisp_Object window;
1290 return decode_window (window)->dedicated;
1293 DEFUN ("set-window-dedicated-p", Fset_window_dedicated_p,
1294 Sset_window_dedicated_p, 2, 2, 0,
1295 doc: /* Control whether WINDOW is dedicated to the buffer it displays.
1296 If it is dedicated, Emacs will not automatically change
1297 which buffer appears in it.
1298 The second argument is the new value for the dedication flag;
1299 non-nil means yes. */)
1300 (window, arg)
1301 Lisp_Object window, arg;
1303 register struct window *w = decode_window (window);
1305 w->dedicated = arg;
1307 return w->dedicated;
1310 DEFUN ("window-display-table", Fwindow_display_table, Swindow_display_table,
1311 0, 1, 0,
1312 doc: /* Return the display-table that WINDOW is using.
1313 WINDOW defaults to the selected window. */)
1314 (window)
1315 Lisp_Object window;
1317 return decode_window (window)->display_table;
1320 /* Get the display table for use on window W. This is either W's
1321 display table or W's buffer's display table. Ignore the specified
1322 tables if they are not valid; if no valid table is specified,
1323 return 0. */
1325 struct Lisp_Char_Table *
1326 window_display_table (w)
1327 struct window *w;
1329 struct Lisp_Char_Table *dp = NULL;
1331 if (DISP_TABLE_P (w->display_table))
1332 dp = XCHAR_TABLE (w->display_table);
1333 else if (BUFFERP (w->buffer))
1335 struct buffer *b = XBUFFER (w->buffer);
1337 if (DISP_TABLE_P (b->display_table))
1338 dp = XCHAR_TABLE (b->display_table);
1339 else if (DISP_TABLE_P (Vstandard_display_table))
1340 dp = XCHAR_TABLE (Vstandard_display_table);
1343 return dp;
1346 DEFUN ("set-window-display-table", Fset_window_display_table, Sset_window_display_table, 2, 2, 0,
1347 doc: /* Set WINDOW's display-table to TABLE. */)
1348 (window, table)
1349 register Lisp_Object window, table;
1351 register struct window *w;
1353 w = decode_window (window);
1354 w->display_table = table;
1355 return table;
1358 /* Record info on buffer window w is displaying
1359 when it is about to cease to display that buffer. */
1360 static void
1361 unshow_buffer (w)
1362 register struct window *w;
1364 Lisp_Object buf;
1365 struct buffer *b;
1367 buf = w->buffer;
1368 b = XBUFFER (buf);
1369 if (b != XMARKER (w->pointm)->buffer)
1370 abort ();
1372 #if 0
1373 if (w == XWINDOW (selected_window)
1374 || ! EQ (buf, XWINDOW (selected_window)->buffer))
1375 /* Do this except when the selected window's buffer
1376 is being removed from some other window. */
1377 #endif
1378 /* last_window_start records the start position that this buffer
1379 had in the last window to be disconnected from it.
1380 Now that this statement is unconditional,
1381 it is possible for the buffer to be displayed in the
1382 selected window, while last_window_start reflects another
1383 window which was recently showing the same buffer.
1384 Some people might say that might be a good thing. Let's see. */
1385 b->last_window_start = marker_position (w->start);
1387 /* Point in the selected window's buffer
1388 is actually stored in that buffer, and the window's pointm isn't used.
1389 So don't clobber point in that buffer. */
1390 if (! EQ (buf, XWINDOW (selected_window)->buffer)
1391 /* This line helps to fix Horsley's testbug.el bug. */
1392 && !(WINDOWP (b->last_selected_window)
1393 && w != XWINDOW (b->last_selected_window)
1394 && EQ (buf, XWINDOW (b->last_selected_window)->buffer)))
1395 temp_set_point_both (b,
1396 clip_to_bounds (BUF_BEGV (b),
1397 XMARKER (w->pointm)->charpos,
1398 BUF_ZV (b)),
1399 clip_to_bounds (BUF_BEGV_BYTE (b),
1400 marker_byte_position (w->pointm),
1401 BUF_ZV_BYTE (b)));
1403 if (WINDOWP (b->last_selected_window)
1404 && w == XWINDOW (b->last_selected_window))
1405 b->last_selected_window = Qnil;
1408 /* Put replacement into the window structure in place of old. */
1409 static void
1410 replace_window (old, replacement)
1411 Lisp_Object old, replacement;
1413 register Lisp_Object tem;
1414 register struct window *o = XWINDOW (old), *p = XWINDOW (replacement);
1416 /* If OLD is its frame's root_window, then replacement is the new
1417 root_window for that frame. */
1419 if (EQ (old, FRAME_ROOT_WINDOW (XFRAME (o->frame))))
1420 FRAME_ROOT_WINDOW (XFRAME (o->frame)) = replacement;
1422 p->left_col = o->left_col;
1423 p->top_line = o->top_line;
1424 p->total_cols = o->total_cols;
1425 p->total_lines = o->total_lines;
1426 p->desired_matrix = p->current_matrix = 0;
1427 p->vscroll = 0;
1428 bzero (&p->cursor, sizeof (p->cursor));
1429 bzero (&p->last_cursor, sizeof (p->last_cursor));
1430 bzero (&p->phys_cursor, sizeof (p->phys_cursor));
1431 p->phys_cursor_type = -1;
1432 p->phys_cursor_width = -1;
1433 p->must_be_updated_p = 0;
1434 p->pseudo_window_p = 0;
1435 XSETFASTINT (p->window_end_vpos, 0);
1436 XSETFASTINT (p->window_end_pos, 0);
1437 p->window_end_valid = Qnil;
1438 p->frozen_window_start_p = 0;
1439 p->orig_top_line = p->orig_total_lines = Qnil;
1441 p->next = tem = o->next;
1442 if (!NILP (tem))
1443 XWINDOW (tem)->prev = replacement;
1445 p->prev = tem = o->prev;
1446 if (!NILP (tem))
1447 XWINDOW (tem)->next = replacement;
1449 p->parent = tem = o->parent;
1450 if (!NILP (tem))
1452 if (EQ (XWINDOW (tem)->vchild, old))
1453 XWINDOW (tem)->vchild = replacement;
1454 if (EQ (XWINDOW (tem)->hchild, old))
1455 XWINDOW (tem)->hchild = replacement;
1458 /*** Here, if replacement is a vertical combination
1459 and so is its new parent, we should make replacement's
1460 children be children of that parent instead. ***/
1463 DEFUN ("delete-window", Fdelete_window, Sdelete_window, 0, 1, "",
1464 doc: /* Remove WINDOW from the display. Default is selected window. */)
1465 (window)
1466 register Lisp_Object window;
1468 delete_window (window);
1470 if (! NILP (Vwindow_configuration_change_hook)
1471 && ! NILP (Vrun_hooks))
1472 call1 (Vrun_hooks, Qwindow_configuration_change_hook);
1474 return Qnil;
1477 void
1478 delete_window (window)
1479 register Lisp_Object window;
1481 register Lisp_Object tem, parent, sib;
1482 register struct window *p;
1483 register struct window *par;
1484 struct frame *f;
1486 /* Because this function is called by other C code on non-leaf
1487 windows, the CHECK_LIVE_WINDOW macro would choke inappropriately,
1488 so we can't decode_window here. */
1489 if (NILP (window))
1490 window = selected_window;
1491 else
1492 CHECK_WINDOW (window);
1493 p = XWINDOW (window);
1495 /* It's a no-op to delete an already-deleted window. */
1496 if (NILP (p->buffer)
1497 && NILP (p->hchild)
1498 && NILP (p->vchild))
1499 return;
1501 parent = p->parent;
1502 if (NILP (parent))
1503 error ("Attempt to delete minibuffer or sole ordinary window");
1504 par = XWINDOW (parent);
1506 windows_or_buffers_changed++;
1507 Vwindow_list = Qnil;
1508 f = XFRAME (WINDOW_FRAME (p));
1509 FRAME_WINDOW_SIZES_CHANGED (f) = 1;
1511 /* Are we trying to delete any frame's selected window? */
1513 Lisp_Object swindow, pwindow;
1515 /* See if the frame's selected window is either WINDOW
1516 or any subwindow of it, by finding all that window's parents
1517 and comparing each one with WINDOW. */
1518 swindow = FRAME_SELECTED_WINDOW (f);
1520 while (1)
1522 pwindow = swindow;
1523 while (!NILP (pwindow))
1525 if (EQ (window, pwindow))
1526 break;
1527 pwindow = XWINDOW (pwindow)->parent;
1530 /* If the window being deleted is not a parent of SWINDOW,
1531 then SWINDOW is ok as the new selected window. */
1532 if (!EQ (window, pwindow))
1533 break;
1534 /* Otherwise, try another window for SWINDOW. */
1535 swindow = Fnext_window (swindow, Qlambda, Qnil);;
1537 /* If we get back to the frame's selected window,
1538 it means there was no acceptable alternative,
1539 so we cannot delete. */
1540 if (EQ (swindow, FRAME_SELECTED_WINDOW (f)))
1541 error ("Cannot delete window");
1544 /* If we need to change SWINDOW, do it. */
1545 if (! EQ (swindow, FRAME_SELECTED_WINDOW (f)))
1547 /* If we're about to delete the selected window on the
1548 selected frame, then we should use Fselect_window to select
1549 the new window. On the other hand, if we're about to
1550 delete the selected window on any other frame, we shouldn't do
1551 anything but set the frame's selected_window slot. */
1552 if (EQ (FRAME_SELECTED_WINDOW (f), selected_window))
1553 Fselect_window (swindow, Qnil);
1554 else
1555 FRAME_SELECTED_WINDOW (f) = swindow;
1559 /* Now we know we can delete this one. */
1560 window_deletion_count++;
1562 tem = p->buffer;
1563 /* tem is null for dummy parent windows
1564 (which have inferiors but not any contents themselves) */
1565 if (!NILP (tem))
1567 unshow_buffer (p);
1568 unchain_marker (XMARKER (p->pointm));
1569 unchain_marker (XMARKER (p->start));
1572 /* Free window glyph matrices. It is sure that they are allocated
1573 again when ADJUST_GLYPHS is called. Block input so that expose
1574 events and other events that access glyph matrices are not
1575 processed while we are changing them. */
1576 BLOCK_INPUT;
1577 free_window_matrices (XWINDOW (FRAME_ROOT_WINDOW (f)));
1579 tem = p->next;
1580 if (!NILP (tem))
1581 XWINDOW (tem)->prev = p->prev;
1583 tem = p->prev;
1584 if (!NILP (tem))
1585 XWINDOW (tem)->next = p->next;
1587 if (EQ (window, par->hchild))
1588 par->hchild = p->next;
1589 if (EQ (window, par->vchild))
1590 par->vchild = p->next;
1592 /* Find one of our siblings to give our space to. */
1593 sib = p->prev;
1594 if (NILP (sib))
1596 /* If p gives its space to its next sibling, that sibling needs
1597 to have its top/left side pulled back to where p's is.
1598 set_window_{height,width} will re-position the sibling's
1599 children. */
1600 sib = p->next;
1601 XWINDOW (sib)->top_line = p->top_line;
1602 XWINDOW (sib)->left_col = p->left_col;
1605 /* Stretch that sibling. */
1606 if (!NILP (par->vchild))
1607 set_window_height (sib,
1608 XFASTINT (XWINDOW (sib)->total_lines) + XFASTINT (p->total_lines),
1610 if (!NILP (par->hchild))
1611 set_window_width (sib,
1612 XFASTINT (XWINDOW (sib)->total_cols) + XFASTINT (p->total_cols),
1615 /* If parent now has only one child,
1616 put the child into the parent's place. */
1617 tem = par->hchild;
1618 if (NILP (tem))
1619 tem = par->vchild;
1620 if (NILP (XWINDOW (tem)->next)) {
1621 replace_window (parent, tem);
1622 par = XWINDOW (tem);
1625 /* Since we may be deleting combination windows, we must make sure that
1626 not only p but all its children have been marked as deleted. */
1627 if (! NILP (p->hchild))
1628 delete_all_subwindows (XWINDOW (p->hchild));
1629 else if (! NILP (p->vchild))
1630 delete_all_subwindows (XWINDOW (p->vchild));
1632 /* Mark this window as deleted. */
1633 p->buffer = p->hchild = p->vchild = Qnil;
1635 if (! NILP (par->parent))
1636 par = XWINDOW (par->parent);
1638 /* Check if we have a v/hchild with a v/hchild. In that case remove
1639 one of them. */
1641 if (! NILP (par->vchild) && ! NILP (XWINDOW (par->vchild)->vchild))
1643 p = XWINDOW (par->vchild);
1644 par->vchild = p->vchild;
1645 tem = p->vchild;
1647 else if (! NILP (par->hchild) && ! NILP (XWINDOW (par->hchild)->hchild))
1649 p = XWINDOW (par->hchild);
1650 par->hchild = p->hchild;
1651 tem = p->hchild;
1653 else
1654 p = 0;
1656 if (p)
1658 while (! NILP (tem)) {
1659 XWINDOW (tem)->parent = p->parent;
1660 if (NILP (XWINDOW (tem)->next))
1661 break;
1662 tem = XWINDOW (tem)->next;
1664 if (! NILP (tem)) {
1665 /* The next of the v/hchild we are removing is now the next of the
1666 last child for the v/hchild:
1667 Before v/hchild -> v/hchild -> next1 -> next2
1669 -> next3
1670 After: v/hchild -> next1 -> next2 -> next3
1672 XWINDOW (tem)->next = p->next;
1673 if (! NILP (p->next))
1674 XWINDOW (p->next)->prev = tem;
1676 p->next = p->prev = p->vchild = p->hchild = p->buffer = Qnil;
1680 /* Adjust glyph matrices. */
1681 adjust_glyphs (f);
1682 UNBLOCK_INPUT;
1687 /***********************************************************************
1688 Window List
1689 ***********************************************************************/
1691 /* Add window W to *USER_DATA. USER_DATA is actually a Lisp_Object
1692 pointer. This is a callback function for foreach_window, used in
1693 function window_list. */
1695 static int
1696 add_window_to_list (w, user_data)
1697 struct window *w;
1698 void *user_data;
1700 Lisp_Object *list = (Lisp_Object *) user_data;
1701 Lisp_Object window;
1702 XSETWINDOW (window, w);
1703 *list = Fcons (window, *list);
1704 return 1;
1708 /* Return a list of all windows, for use by next_window. If
1709 Vwindow_list is a list, return that list. Otherwise, build a new
1710 list, cache it in Vwindow_list, and return that. */
1712 static Lisp_Object
1713 window_list ()
1715 if (!CONSP (Vwindow_list))
1717 Lisp_Object tail;
1719 Vwindow_list = Qnil;
1720 for (tail = Vframe_list; CONSP (tail); tail = XCDR (tail))
1722 Lisp_Object args[2];
1724 /* We are visiting windows in canonical order, and add
1725 new windows at the front of args[1], which means we
1726 have to reverse this list at the end. */
1727 args[1] = Qnil;
1728 foreach_window (XFRAME (XCAR (tail)), add_window_to_list, &args[1]);
1729 args[0] = Vwindow_list;
1730 args[1] = Fnreverse (args[1]);
1731 Vwindow_list = Fnconc (2, args);
1735 return Vwindow_list;
1739 /* Value is non-zero if WINDOW satisfies the constraints given by
1740 OWINDOW, MINIBUF and ALL_FRAMES.
1742 MINIBUF t means WINDOW may be minibuffer windows.
1743 `lambda' means WINDOW may not be a minibuffer window.
1744 a window means a specific minibuffer window
1746 ALL_FRAMES t means search all frames,
1747 nil means search just current frame,
1748 `visible' means search just visible frames,
1749 0 means search visible and iconified frames,
1750 a window means search the frame that window belongs to,
1751 a frame means consider windows on that frame, only. */
1753 static int
1754 candidate_window_p (window, owindow, minibuf, all_frames)
1755 Lisp_Object window, owindow, minibuf, all_frames;
1757 struct window *w = XWINDOW (window);
1758 struct frame *f = XFRAME (w->frame);
1759 int candidate_p = 1;
1761 if (!BUFFERP (w->buffer))
1762 candidate_p = 0;
1763 else if (MINI_WINDOW_P (w)
1764 && (EQ (minibuf, Qlambda)
1765 || (WINDOWP (minibuf) && !EQ (minibuf, window))))
1767 /* If MINIBUF is `lambda' don't consider any mini-windows.
1768 If it is a window, consider only that one. */
1769 candidate_p = 0;
1771 else if (EQ (all_frames, Qt))
1772 candidate_p = 1;
1773 else if (NILP (all_frames))
1775 xassert (WINDOWP (owindow));
1776 candidate_p = EQ (w->frame, XWINDOW (owindow)->frame);
1778 else if (EQ (all_frames, Qvisible))
1780 FRAME_SAMPLE_VISIBILITY (f);
1781 candidate_p = FRAME_VISIBLE_P (f);
1783 else if (INTEGERP (all_frames) && XINT (all_frames) == 0)
1785 FRAME_SAMPLE_VISIBILITY (f);
1786 candidate_p = FRAME_VISIBLE_P (f) || FRAME_ICONIFIED_P (f);
1788 else if (WINDOWP (all_frames))
1789 candidate_p = (EQ (FRAME_MINIBUF_WINDOW (f), all_frames)
1790 || EQ (XWINDOW (all_frames)->frame, w->frame)
1791 || EQ (XWINDOW (all_frames)->frame, FRAME_FOCUS_FRAME (f)));
1792 else if (FRAMEP (all_frames))
1793 candidate_p = EQ (all_frames, w->frame);
1795 return candidate_p;
1799 /* Decode arguments as allowed by Fnext_window, Fprevious_window, and
1800 Fwindow_list. See there for the meaning of WINDOW, MINIBUF, and
1801 ALL_FRAMES. */
1803 static void
1804 decode_next_window_args (window, minibuf, all_frames)
1805 Lisp_Object *window, *minibuf, *all_frames;
1807 if (NILP (*window))
1808 *window = selected_window;
1809 else
1810 CHECK_LIVE_WINDOW (*window);
1812 /* MINIBUF nil may or may not include minibuffers. Decide if it
1813 does. */
1814 if (NILP (*minibuf))
1815 *minibuf = minibuf_level ? minibuf_window : Qlambda;
1816 else if (!EQ (*minibuf, Qt))
1817 *minibuf = Qlambda;
1819 /* Now *MINIBUF can be t => count all minibuffer windows, `lambda'
1820 => count none of them, or a specific minibuffer window (the
1821 active one) to count. */
1823 /* ALL_FRAMES nil doesn't specify which frames to include. */
1824 if (NILP (*all_frames))
1825 *all_frames = (!EQ (*minibuf, Qlambda)
1826 ? FRAME_MINIBUF_WINDOW (XFRAME (XWINDOW (*window)->frame))
1827 : Qnil);
1828 else if (EQ (*all_frames, Qvisible))
1830 else if (EQ (*all_frames, make_number (0)))
1832 else if (FRAMEP (*all_frames))
1834 else if (!EQ (*all_frames, Qt))
1835 *all_frames = Qnil;
1837 /* Now *ALL_FRAMES is t meaning search all frames, nil meaning
1838 search just current frame, `visible' meaning search just visible
1839 frames, 0 meaning search visible and iconified frames, or a
1840 window, meaning search the frame that window belongs to, or a
1841 frame, meaning consider windows on that frame, only. */
1845 /* Return the next or previous window of WINDOW in canonical ordering
1846 of windows. NEXT_P non-zero means return the next window. See the
1847 documentation string of next-window for the meaning of MINIBUF and
1848 ALL_FRAMES. */
1850 static Lisp_Object
1851 next_window (window, minibuf, all_frames, next_p)
1852 Lisp_Object window, minibuf, all_frames;
1853 int next_p;
1855 decode_next_window_args (&window, &minibuf, &all_frames);
1857 /* If ALL_FRAMES is a frame, and WINDOW isn't on that frame, just
1858 return the first window on the frame. */
1859 if (FRAMEP (all_frames)
1860 && !EQ (all_frames, XWINDOW (window)->frame))
1861 return Fframe_first_window (all_frames);
1863 if (next_p)
1865 Lisp_Object list;
1867 /* Find WINDOW in the list of all windows. */
1868 list = Fmemq (window, window_list ());
1870 /* Scan forward from WINDOW to the end of the window list. */
1871 if (CONSP (list))
1872 for (list = XCDR (list); CONSP (list); list = XCDR (list))
1873 if (candidate_window_p (XCAR (list), window, minibuf, all_frames))
1874 break;
1876 /* Scan from the start of the window list up to WINDOW. */
1877 if (!CONSP (list))
1878 for (list = Vwindow_list;
1879 CONSP (list) && !EQ (XCAR (list), window);
1880 list = XCDR (list))
1881 if (candidate_window_p (XCAR (list), window, minibuf, all_frames))
1882 break;
1884 if (CONSP (list))
1885 window = XCAR (list);
1887 else
1889 Lisp_Object candidate, list;
1891 /* Scan through the list of windows for candidates. If there are
1892 candidate windows in front of WINDOW, the last one of these
1893 is the one we want. If there are candidates following WINDOW
1894 in the list, again the last one of these is the one we want. */
1895 candidate = Qnil;
1896 for (list = window_list (); CONSP (list); list = XCDR (list))
1898 if (EQ (XCAR (list), window))
1900 if (WINDOWP (candidate))
1901 break;
1903 else if (candidate_window_p (XCAR (list), window, minibuf,
1904 all_frames))
1905 candidate = XCAR (list);
1908 if (WINDOWP (candidate))
1909 window = candidate;
1912 return window;
1916 DEFUN ("next-window", Fnext_window, Snext_window, 0, 3, 0,
1917 doc: /* Return next window after WINDOW in canonical ordering of windows.
1918 If omitted, WINDOW defaults to the selected window.
1920 Optional second arg MINIBUF t means count the minibuffer window even
1921 if not active. MINIBUF nil or omitted means count the minibuffer iff
1922 it is active. MINIBUF neither t nor nil means not to count the
1923 minibuffer even if it is active.
1925 Several frames may share a single minibuffer; if the minibuffer
1926 counts, all windows on all frames that share that minibuffer count
1927 too. Therefore, `next-window' can be used to iterate through the
1928 set of windows even when the minibuffer is on another frame. If the
1929 minibuffer does not count, only windows from WINDOW's frame count.
1931 Optional third arg ALL-FRAMES t means include windows on all frames.
1932 ALL-FRAMES nil or omitted means cycle within the frames as specified
1933 above. ALL-FRAMES = `visible' means include windows on all visible frames.
1934 ALL-FRAMES = 0 means include windows on all visible and iconified frames.
1935 If ALL-FRAMES is a frame, restrict search to windows on that frame.
1936 Anything else means restrict to WINDOW's frame.
1938 If you use consistent values for MINIBUF and ALL-FRAMES, you can use
1939 `next-window' to iterate through the entire cycle of acceptable
1940 windows, eventually ending up back at the window you started with.
1941 `previous-window' traverses the same cycle, in the reverse order. */)
1942 (window, minibuf, all_frames)
1943 Lisp_Object window, minibuf, all_frames;
1945 return next_window (window, minibuf, all_frames, 1);
1949 DEFUN ("previous-window", Fprevious_window, Sprevious_window, 0, 3, 0,
1950 doc: /* Return the window preceding WINDOW in canonical ordering of windows.
1951 If omitted, WINDOW defaults to the selected window.
1953 Optional second arg MINIBUF t means count the minibuffer window even
1954 if not active. MINIBUF nil or omitted means count the minibuffer iff
1955 it is active. MINIBUF neither t nor nil means not to count the
1956 minibuffer even if it is active.
1958 Several frames may share a single minibuffer; if the minibuffer
1959 counts, all windows on all frames that share that minibuffer count
1960 too. Therefore, `previous-window' can be used to iterate through
1961 the set of windows even when the minibuffer is on another frame. If
1962 the minibuffer does not count, only windows from WINDOW's frame count
1964 Optional third arg ALL-FRAMES t means include windows on all frames.
1965 ALL-FRAMES nil or omitted means cycle within the frames as specified
1966 above. ALL-FRAMES = `visible' means include windows on all visible frames.
1967 ALL-FRAMES = 0 means include windows on all visible and iconified frames.
1968 If ALL-FRAMES is a frame, restrict search to windows on that frame.
1969 Anything else means restrict to WINDOW's frame.
1971 If you use consistent values for MINIBUF and ALL-FRAMES, you can use
1972 `previous-window' to iterate through the entire cycle of acceptable
1973 windows, eventually ending up back at the window you started with.
1974 `next-window' traverses the same cycle, in the reverse order. */)
1975 (window, minibuf, all_frames)
1976 Lisp_Object window, minibuf, all_frames;
1978 return next_window (window, minibuf, all_frames, 0);
1982 DEFUN ("other-window", Fother_window, Sother_window, 1, 2, "p",
1983 doc: /* Select the ARG'th different window on this frame.
1984 All windows on current frame are arranged in a cyclic order.
1985 This command selects the window ARG steps away in that order.
1986 A negative ARG moves in the opposite order. The optional second
1987 argument ALL-FRAMES has the same meaning as in `next-window', which see. */)
1988 (arg, all_frames)
1989 Lisp_Object arg, all_frames;
1991 Lisp_Object window;
1992 int i;
1994 CHECK_NUMBER (arg);
1995 window = selected_window;
1997 for (i = XINT (arg); i > 0; --i)
1998 window = Fnext_window (window, Qnil, all_frames);
1999 for (; i < 0; ++i)
2000 window = Fprevious_window (window, Qnil, all_frames);
2002 Fselect_window (window, Qnil);
2003 return Qnil;
2007 DEFUN ("window-list", Fwindow_list, Swindow_list, 0, 3, 0,
2008 doc: /* Return a list of windows on FRAME, starting with WINDOW.
2009 FRAME nil or omitted means use the selected frame.
2010 WINDOW nil or omitted means use the selected window.
2011 MINIBUF t means include the minibuffer window, even if it isn't active.
2012 MINIBUF nil or omitted means include the minibuffer window only
2013 if it's active.
2014 MINIBUF neither nil nor t means never include the minibuffer window. */)
2015 (frame, minibuf, window)
2016 Lisp_Object frame, minibuf, window;
2018 if (NILP (window))
2019 window = FRAMEP (frame) ? XFRAME (frame)->selected_window : selected_window;
2020 CHECK_WINDOW (window);
2021 if (NILP (frame))
2022 frame = selected_frame;
2024 if (!EQ (frame, XWINDOW (window)->frame))
2025 error ("Window is on a different frame");
2027 return window_list_1 (window, minibuf, frame);
2031 /* Return a list of windows in canonical ordering. Arguments are like
2032 for `next-window'. */
2034 static Lisp_Object
2035 window_list_1 (window, minibuf, all_frames)
2036 Lisp_Object window, minibuf, all_frames;
2038 Lisp_Object tail, list, rest;
2040 decode_next_window_args (&window, &minibuf, &all_frames);
2041 list = Qnil;
2043 for (tail = window_list (); CONSP (tail); tail = XCDR (tail))
2044 if (candidate_window_p (XCAR (tail), window, minibuf, all_frames))
2045 list = Fcons (XCAR (tail), list);
2047 /* Rotate the list to start with WINDOW. */
2048 list = Fnreverse (list);
2049 rest = Fmemq (window, list);
2050 if (!NILP (rest) && !EQ (rest, list))
2052 for (tail = list; !EQ (XCDR (tail), rest); tail = XCDR (tail))
2054 XSETCDR (tail, Qnil);
2055 list = nconc2 (rest, list);
2057 return list;
2062 /* Look at all windows, performing an operation specified by TYPE
2063 with argument OBJ.
2064 If FRAMES is Qt, look at all frames;
2065 Qnil, look at just the selected frame;
2066 Qvisible, look at visible frames;
2067 a frame, just look at windows on that frame.
2068 If MINI is non-zero, perform the operation on minibuffer windows too. */
2070 enum window_loop
2072 WINDOW_LOOP_UNUSED,
2073 GET_BUFFER_WINDOW, /* Arg is buffer */
2074 GET_LRU_WINDOW, /* Arg is t for full-width windows only */
2075 DELETE_OTHER_WINDOWS, /* Arg is window not to delete */
2076 DELETE_BUFFER_WINDOWS, /* Arg is buffer */
2077 GET_LARGEST_WINDOW,
2078 UNSHOW_BUFFER, /* Arg is buffer */
2079 REDISPLAY_BUFFER_WINDOWS, /* Arg is buffer */
2080 CHECK_ALL_WINDOWS
2083 static Lisp_Object
2084 window_loop (type, obj, mini, frames)
2085 enum window_loop type;
2086 Lisp_Object obj, frames;
2087 int mini;
2089 Lisp_Object window, windows, best_window, frame_arg;
2090 struct frame *f;
2091 struct gcpro gcpro1;
2093 /* If we're only looping through windows on a particular frame,
2094 frame points to that frame. If we're looping through windows
2095 on all frames, frame is 0. */
2096 if (FRAMEP (frames))
2097 f = XFRAME (frames);
2098 else if (NILP (frames))
2099 f = SELECTED_FRAME ();
2100 else
2101 f = NULL;
2103 if (f)
2104 frame_arg = Qlambda;
2105 else if (EQ (frames, make_number (0)))
2106 frame_arg = frames;
2107 else if (EQ (frames, Qvisible))
2108 frame_arg = frames;
2109 else
2110 frame_arg = Qt;
2112 /* frame_arg is Qlambda to stick to one frame,
2113 Qvisible to consider all visible frames,
2114 or Qt otherwise. */
2116 /* Pick a window to start with. */
2117 if (WINDOWP (obj))
2118 window = obj;
2119 else if (f)
2120 window = FRAME_SELECTED_WINDOW (f);
2121 else
2122 window = FRAME_SELECTED_WINDOW (SELECTED_FRAME ());
2124 windows = window_list_1 (window, mini ? Qt : Qnil, frame_arg);
2125 GCPRO1 (windows);
2126 best_window = Qnil;
2128 for (; CONSP (windows); windows = XCDR (windows))
2130 struct window *w;
2132 window = XCAR (windows);
2133 w = XWINDOW (window);
2135 /* Note that we do not pay attention here to whether the frame
2136 is visible, since Fwindow_list skips non-visible frames if
2137 that is desired, under the control of frame_arg. */
2138 if (!MINI_WINDOW_P (w)
2139 /* For UNSHOW_BUFFER, we must always consider all windows. */
2140 || type == UNSHOW_BUFFER
2141 || (mini && minibuf_level > 0))
2142 switch (type)
2144 case GET_BUFFER_WINDOW:
2145 if (EQ (w->buffer, obj)
2146 /* Don't find any minibuffer window
2147 except the one that is currently in use. */
2148 && (MINI_WINDOW_P (w)
2149 ? EQ (window, minibuf_window)
2150 : 1))
2152 if (NILP (best_window))
2153 best_window = window;
2154 else if (EQ (window, selected_window))
2155 /* For compatibility with 20.x, prefer to return
2156 selected-window. */
2157 best_window = window;
2159 break;
2161 case GET_LRU_WINDOW:
2162 /* `obj' is an integer encoding a bitvector.
2163 `obj & 1' means consider only full-width windows.
2164 `obj & 2' means consider also dedicated windows. */
2165 if (((XINT (obj) & 1) && !WINDOW_FULL_WIDTH_P (w))
2166 || (!(XINT (obj) & 2) && !NILP (w->dedicated))
2167 /* Minibuffer windows are always ignored. */
2168 || MINI_WINDOW_P (w))
2169 break;
2170 if (NILP (best_window)
2171 || (XFASTINT (XWINDOW (best_window)->use_time)
2172 > XFASTINT (w->use_time)))
2173 best_window = window;
2174 break;
2176 case DELETE_OTHER_WINDOWS:
2177 if (!EQ (window, obj))
2178 Fdelete_window (window);
2179 break;
2181 case DELETE_BUFFER_WINDOWS:
2182 if (EQ (w->buffer, obj))
2184 struct frame *f = XFRAME (WINDOW_FRAME (w));
2186 /* If this window is dedicated, and in a frame of its own,
2187 kill the frame. */
2188 if (EQ (window, FRAME_ROOT_WINDOW (f))
2189 && !NILP (w->dedicated)
2190 && other_visible_frames (f))
2192 /* Skip the other windows on this frame.
2193 There might be one, the minibuffer! */
2194 while (CONSP (XCDR (windows))
2195 && EQ (XWINDOW (XCAR (windows))->frame,
2196 XWINDOW (XCAR (XCDR (windows)))->frame))
2197 windows = XCDR (windows);
2199 /* Now we can safely delete the frame. */
2200 Fdelete_frame (w->frame, Qnil);
2202 else if (NILP (w->parent))
2204 /* If we're deleting the buffer displayed in the
2205 only window on the frame, find a new buffer to
2206 display there. */
2207 Lisp_Object buffer;
2208 buffer = Fother_buffer (obj, Qnil, w->frame);
2209 Fset_window_buffer (window, buffer, Qnil);
2210 if (EQ (window, selected_window))
2211 Fset_buffer (w->buffer);
2213 else
2214 Fdelete_window (window);
2216 break;
2218 case GET_LARGEST_WINDOW:
2219 { /* nil `obj' means to ignore dedicated windows. */
2220 /* Ignore dedicated windows and minibuffers. */
2221 if (MINI_WINDOW_P (w) || (NILP (obj) && !NILP (w->dedicated)))
2222 break;
2224 if (NILP (best_window))
2225 best_window = window;
2226 else
2228 struct window *b = XWINDOW (best_window);
2229 if (XFASTINT (w->total_lines) * XFASTINT (w->total_cols)
2230 > XFASTINT (b->total_lines) * XFASTINT (b->total_cols))
2231 best_window = window;
2234 break;
2236 case UNSHOW_BUFFER:
2237 if (EQ (w->buffer, obj))
2239 Lisp_Object buffer;
2240 struct frame *f = XFRAME (w->frame);
2242 /* Find another buffer to show in this window. */
2243 buffer = Fother_buffer (obj, Qnil, w->frame);
2245 /* If this window is dedicated, and in a frame of its own,
2246 kill the frame. */
2247 if (EQ (window, FRAME_ROOT_WINDOW (f))
2248 && !NILP (w->dedicated)
2249 && other_visible_frames (f))
2251 /* Skip the other windows on this frame.
2252 There might be one, the minibuffer! */
2253 while (CONSP (XCDR (windows))
2254 && EQ (XWINDOW (XCAR (windows))->frame,
2255 XWINDOW (XCAR (XCDR (windows)))->frame))
2256 windows = XCDR (windows);
2258 /* Now we can safely delete the frame. */
2259 Fdelete_frame (w->frame, Qnil);
2261 else if (!NILP (w->dedicated) && !NILP (w->parent))
2263 Lisp_Object window;
2264 XSETWINDOW (window, w);
2265 /* If this window is dedicated and not the only window
2266 in its frame, then kill it. */
2267 Fdelete_window (window);
2269 else
2271 /* Otherwise show a different buffer in the window. */
2272 w->dedicated = Qnil;
2273 Fset_window_buffer (window, buffer, Qnil);
2274 if (EQ (window, selected_window))
2275 Fset_buffer (w->buffer);
2278 break;
2280 case REDISPLAY_BUFFER_WINDOWS:
2281 if (EQ (w->buffer, obj))
2283 mark_window_display_accurate (window, 0);
2284 w->update_mode_line = Qt;
2285 XBUFFER (obj)->prevent_redisplay_optimizations_p = 1;
2286 ++update_mode_lines;
2287 best_window = window;
2289 break;
2291 /* Check for a window that has a killed buffer. */
2292 case CHECK_ALL_WINDOWS:
2293 if (! NILP (w->buffer)
2294 && NILP (XBUFFER (w->buffer)->name))
2295 abort ();
2296 break;
2298 case WINDOW_LOOP_UNUSED:
2299 break;
2303 UNGCPRO;
2304 return best_window;
2307 /* Used for debugging. Abort if any window has a dead buffer. */
2309 void
2310 check_all_windows ()
2312 window_loop (CHECK_ALL_WINDOWS, Qnil, 1, Qt);
2315 DEFUN ("get-lru-window", Fget_lru_window, Sget_lru_window, 0, 2, 0,
2316 doc: /* Return the window least recently selected or used for display.
2317 \(LRU means Least Recently Used.)
2319 Return a full-width window if possible.
2320 A minibuffer window is never a candidate.
2321 A dedicated window is never a candidate, unless DEDICATED is non-nil,
2322 so if all windows are dedicated, the value is nil.
2323 If optional argument FRAME is `visible', search all visible frames.
2324 If FRAME is 0, search all visible and iconified frames.
2325 If FRAME is t, search all frames.
2326 If FRAME is nil, search only the selected frame.
2327 If FRAME is a frame, search only that frame. */)
2328 (frame, dedicated)
2329 Lisp_Object frame, dedicated;
2331 register Lisp_Object w;
2332 /* First try for a window that is full-width */
2333 w = window_loop (GET_LRU_WINDOW,
2334 NILP (dedicated) ? make_number (1) : make_number (3),
2335 0, frame);
2336 if (!NILP (w) && !EQ (w, selected_window))
2337 return w;
2338 /* If none of them, try the rest */
2339 return window_loop (GET_LRU_WINDOW,
2340 NILP (dedicated) ? make_number (0) : make_number (2),
2341 0, frame);
2344 DEFUN ("get-largest-window", Fget_largest_window, Sget_largest_window, 0, 2, 0,
2345 doc: /* Return the largest window in area.
2346 A minibuffer window is never a candidate.
2347 A dedicated window is never a candidate unless DEDICATED is non-nil,
2348 so if all windows are dedicated, the value is nil.
2349 If optional argument FRAME is `visible', search all visible frames.
2350 If FRAME is 0, search all visible and iconified frames.
2351 If FRAME is t, search all frames.
2352 If FRAME is nil, search only the selected frame.
2353 If FRAME is a frame, search only that frame. */)
2354 (frame, dedicated)
2355 Lisp_Object frame, dedicated;
2357 return window_loop (GET_LARGEST_WINDOW, dedicated, 0,
2358 frame);
2361 DEFUN ("get-buffer-window", Fget_buffer_window, Sget_buffer_window, 1, 2, 0,
2362 doc: /* Return a window currently displaying BUFFER, or nil if none.
2363 BUFFER can be a buffer or a buffer name.
2364 If optional argument FRAME is `visible', search all visible frames.
2365 If optional argument FRAME is 0, search all visible and iconified frames.
2366 If FRAME is t, search all frames.
2367 If FRAME is nil, search only the selected frame.
2368 If FRAME is a frame, search only that frame. */)
2369 (buffer, frame)
2370 Lisp_Object buffer, frame;
2372 buffer = Fget_buffer (buffer);
2373 if (BUFFERP (buffer))
2374 return window_loop (GET_BUFFER_WINDOW, buffer, 1, frame);
2375 else
2376 return Qnil;
2379 DEFUN ("delete-other-windows", Fdelete_other_windows, Sdelete_other_windows,
2380 0, 1, "",
2381 doc: /* Make WINDOW (or the selected window) fill its frame.
2382 Only the frame WINDOW is on is affected.
2383 This function tries to reduce display jumps
2384 by keeping the text previously visible in WINDOW
2385 in the same place on the frame. Doing this depends on
2386 the value of (window-start WINDOW), so if calling this function
2387 in a program gives strange scrolling, make sure the window-start
2388 value is reasonable when this function is called. */)
2389 (window)
2390 Lisp_Object window;
2392 struct window *w;
2393 int startpos;
2394 int top, new_top;
2396 if (NILP (window))
2397 window = selected_window;
2398 else
2399 CHECK_LIVE_WINDOW (window);
2400 w = XWINDOW (window);
2402 startpos = marker_position (w->start);
2403 top = WINDOW_TOP_EDGE_LINE (w) - FRAME_TOP_MARGIN (XFRAME (WINDOW_FRAME (w)));
2405 if (MINI_WINDOW_P (w) && top > 0)
2406 error ("Can't expand minibuffer to full frame");
2408 window_loop (DELETE_OTHER_WINDOWS, window, 0, WINDOW_FRAME (w));
2410 /* Try to minimize scrolling, by setting the window start to the point
2411 will cause the text at the old window start to be at the same place
2412 on the frame. But don't try to do this if the window start is
2413 outside the visible portion (as might happen when the display is
2414 not current, due to typeahead). */
2415 new_top = WINDOW_TOP_EDGE_LINE (w) - FRAME_TOP_MARGIN (XFRAME (WINDOW_FRAME (w)));
2416 if (new_top != top
2417 && startpos >= BUF_BEGV (XBUFFER (w->buffer))
2418 && startpos <= BUF_ZV (XBUFFER (w->buffer)))
2420 struct position pos;
2421 struct buffer *obuf = current_buffer;
2423 Fset_buffer (w->buffer);
2424 /* This computation used to temporarily move point, but that can
2425 have unwanted side effects due to text properties. */
2426 pos = *vmotion (startpos, -top, w);
2428 set_marker_both (w->start, w->buffer, pos.bufpos, pos.bytepos);
2429 w->window_end_valid = Qnil;
2430 w->start_at_line_beg = ((pos.bytepos == BEGV_BYTE
2431 || FETCH_BYTE (pos.bytepos - 1) == '\n') ? Qt
2432 : Qnil);
2433 /* We need to do this, so that the window-scroll-functions
2434 get called. */
2435 w->optional_new_start = Qt;
2437 set_buffer_internal (obuf);
2440 return Qnil;
2443 DEFUN ("delete-windows-on", Fdelete_windows_on, Sdelete_windows_on,
2444 1, 2, "bDelete windows on (buffer): ",
2445 doc: /* Delete all windows showing BUFFER.
2446 BUFFER must be a buffer or the name of an existing buffer.
2447 Optional second argument FRAME controls which frames are affected.
2448 If optional argument FRAME is `visible', search all visible frames.
2449 If FRAME is 0, search all visible and iconified frames.
2450 If FRAME is nil, search all frames.
2451 If FRAME is t, search only the selected frame.
2452 If FRAME is a frame, search only that frame. */)
2453 (buffer, frame)
2454 Lisp_Object buffer, frame;
2456 /* FRAME uses t and nil to mean the opposite of what window_loop
2457 expects. */
2458 if (NILP (frame))
2459 frame = Qt;
2460 else if (EQ (frame, Qt))
2461 frame = Qnil;
2463 if (!NILP (buffer))
2465 buffer = Fget_buffer (buffer);
2466 CHECK_BUFFER (buffer);
2467 window_loop (DELETE_BUFFER_WINDOWS, buffer, 0, frame);
2470 return Qnil;
2473 DEFUN ("replace-buffer-in-windows", Freplace_buffer_in_windows,
2474 Sreplace_buffer_in_windows,
2475 1, 1, "bReplace buffer in windows: ",
2476 doc: /* Replace BUFFER with some other buffer in all windows showing it.
2477 BUFFER may be a buffer or the name of an existing buffer. */)
2478 (buffer)
2479 Lisp_Object buffer;
2481 if (!NILP (buffer))
2483 buffer = Fget_buffer (buffer);
2484 CHECK_BUFFER (buffer);
2485 window_loop (UNSHOW_BUFFER, buffer, 0, Qt);
2487 return Qnil;
2490 /* Replace BUFFER with some other buffer in all windows
2491 of all frames, even those on other keyboards. */
2493 void
2494 replace_buffer_in_all_windows (buffer)
2495 Lisp_Object buffer;
2497 #ifdef MULTI_KBOARD
2498 Lisp_Object tail, frame;
2500 /* A single call to window_loop won't do the job
2501 because it only considers frames on the current keyboard.
2502 So loop manually over frames, and handle each one. */
2503 FOR_EACH_FRAME (tail, frame)
2504 window_loop (UNSHOW_BUFFER, buffer, 1, frame);
2505 #else
2506 window_loop (UNSHOW_BUFFER, buffer, 1, Qt);
2507 #endif
2510 /* Set the height of WINDOW and all its inferiors. */
2512 /* The smallest acceptable dimensions for a window. Anything smaller
2513 might crash Emacs. */
2515 #define MIN_SAFE_WINDOW_WIDTH (2)
2516 #define MIN_SAFE_WINDOW_HEIGHT (1)
2518 /* Make sure that window_min_height and window_min_width are
2519 not too small; if they are, set them to safe minima. */
2521 static void
2522 check_min_window_sizes ()
2524 /* Smaller values might permit a crash. */
2525 if (window_min_width < MIN_SAFE_WINDOW_WIDTH)
2526 window_min_width = MIN_SAFE_WINDOW_WIDTH;
2527 if (window_min_height < MIN_SAFE_WINDOW_HEIGHT)
2528 window_min_height = MIN_SAFE_WINDOW_HEIGHT;
2531 /* If *ROWS or *COLS are too small a size for FRAME, set them to the
2532 minimum allowable size. */
2534 void
2535 check_frame_size (frame, rows, cols)
2536 FRAME_PTR frame;
2537 int *rows, *cols;
2539 /* For height, we have to see:
2540 how many windows the frame has at minimum (one or two),
2541 and whether it has a menu bar or other special stuff at the top. */
2542 int min_height
2543 = ((FRAME_MINIBUF_ONLY_P (frame) || ! FRAME_HAS_MINIBUF_P (frame))
2544 ? MIN_SAFE_WINDOW_HEIGHT
2545 : 2 * MIN_SAFE_WINDOW_HEIGHT);
2547 if (FRAME_TOP_MARGIN (frame) > 0)
2548 min_height += FRAME_TOP_MARGIN (frame);
2550 if (*rows < min_height)
2551 *rows = min_height;
2552 if (*cols < MIN_SAFE_WINDOW_WIDTH)
2553 *cols = MIN_SAFE_WINDOW_WIDTH;
2557 /* Value is non-zero if window W is fixed-size. WIDTH_P non-zero means
2558 check if W's width can be changed, otherwise check W's height.
2559 CHECK_SIBLINGS_P non-zero means check resizablity of WINDOW's
2560 siblings, too. If none of the siblings is resizable, WINDOW isn't
2561 either. */
2563 static int
2564 window_fixed_size_p (w, width_p, check_siblings_p)
2565 struct window *w;
2566 int width_p, check_siblings_p;
2568 int fixed_p;
2569 struct window *c;
2571 if (!NILP (w->hchild))
2573 c = XWINDOW (w->hchild);
2575 if (width_p)
2577 /* A horiz. combination is fixed-width if all of if its
2578 children are. */
2579 while (c && window_fixed_size_p (c, width_p, 0))
2580 c = WINDOWP (c->next) ? XWINDOW (c->next) : NULL;
2581 fixed_p = c == NULL;
2583 else
2585 /* A horiz. combination is fixed-height if one of if its
2586 children is. */
2587 while (c && !window_fixed_size_p (c, width_p, 0))
2588 c = WINDOWP (c->next) ? XWINDOW (c->next) : NULL;
2589 fixed_p = c != NULL;
2592 else if (!NILP (w->vchild))
2594 c = XWINDOW (w->vchild);
2596 if (width_p)
2598 /* A vert. combination is fixed-width if one of if its
2599 children is. */
2600 while (c && !window_fixed_size_p (c, width_p, 0))
2601 c = WINDOWP (c->next) ? XWINDOW (c->next) : NULL;
2602 fixed_p = c != NULL;
2604 else
2606 /* A vert. combination is fixed-height if all of if its
2607 children are. */
2608 while (c && window_fixed_size_p (c, width_p, 0))
2609 c = WINDOWP (c->next) ? XWINDOW (c->next) : NULL;
2610 fixed_p = c == NULL;
2613 else if (BUFFERP (w->buffer))
2615 struct buffer *old = current_buffer;
2616 Lisp_Object val;
2618 current_buffer = XBUFFER (w->buffer);
2619 val = find_symbol_value (Qwindow_size_fixed);
2620 current_buffer = old;
2622 fixed_p = 0;
2623 if (!EQ (val, Qunbound))
2625 fixed_p = !NILP (val);
2627 if (fixed_p
2628 && ((EQ (val, Qheight) && width_p)
2629 || (EQ (val, Qwidth) && !width_p)))
2630 fixed_p = 0;
2633 /* Can't tell if this one is resizable without looking at
2634 siblings. If all siblings are fixed-size this one is too. */
2635 if (!fixed_p && check_siblings_p && WINDOWP (w->parent))
2637 Lisp_Object child;
2639 for (child = w->prev; !NILP (child); child = XWINDOW (child)->prev)
2640 if (!window_fixed_size_p (XWINDOW (child), width_p, 0))
2641 break;
2643 if (NILP (child))
2644 for (child = w->next; !NILP (child); child = XWINDOW (child)->next)
2645 if (!window_fixed_size_p (XWINDOW (child), width_p, 0))
2646 break;
2648 if (NILP (child))
2649 fixed_p = 1;
2652 else
2653 fixed_p = 1;
2655 return fixed_p;
2659 /* Return the minimum size of window W, not taking fixed-width windows
2660 into account. WIDTH_P non-zero means return the minimum width,
2661 otherwise return the minimum height. If W is a combination window,
2662 compute the minimum size from the minimum sizes of W's children. */
2664 static int
2665 window_min_size_1 (w, width_p)
2666 struct window *w;
2667 int width_p;
2669 struct window *c;
2670 int size;
2672 if (!NILP (w->hchild))
2674 c = XWINDOW (w->hchild);
2675 size = 0;
2677 if (width_p)
2679 /* The min width of a horizontal combination is
2680 the sum of the min widths of its children. */
2681 while (c)
2683 size += window_min_size_1 (c, width_p);
2684 c = WINDOWP (c->next) ? XWINDOW (c->next) : NULL;
2687 else
2689 /* The min height a horizontal combination equals
2690 the maximum of all min height of its children. */
2691 while (c)
2693 int min_size = window_min_size_1 (c, width_p);
2694 size = max (min_size, size);
2695 c = WINDOWP (c->next) ? XWINDOW (c->next) : NULL;
2699 else if (!NILP (w->vchild))
2701 c = XWINDOW (w->vchild);
2702 size = 0;
2704 if (width_p)
2706 /* The min width of a vertical combination is
2707 the maximum of the min widths of its children. */
2708 while (c)
2710 int min_size = window_min_size_1 (c, width_p);
2711 size = max (min_size, size);
2712 c = WINDOWP (c->next) ? XWINDOW (c->next) : NULL;
2715 else
2717 /* The min height of a vertical combination equals
2718 the sum of the min height of its children. */
2719 while (c)
2721 size += window_min_size_1 (c, width_p);
2722 c = WINDOWP (c->next) ? XWINDOW (c->next) : NULL;
2726 else
2728 if (width_p)
2729 size = max (window_min_width,
2730 (MIN_SAFE_WINDOW_WIDTH
2731 + WINDOW_FRINGE_COLS (w)
2732 + WINDOW_SCROLL_BAR_COLS (w)));
2733 else
2735 if (MINI_WINDOW_P (w)
2736 || (!WINDOW_WANTS_MODELINE_P (w)
2737 && !WINDOW_WANTS_HEADER_LINE_P (w)))
2738 size = 1;
2739 else
2740 size = window_min_height;
2744 return size;
2748 /* Return the minimum size of window W, taking fixed-size windows into
2749 account. WIDTH_P non-zero means return the minimum width,
2750 otherwise return the minimum height. IGNORE_FIXED_P non-zero means
2751 ignore if W is fixed-size. Set *FIXED to 1 if W is fixed-size
2752 unless FIXED is null. */
2754 static int
2755 window_min_size (w, width_p, ignore_fixed_p, fixed)
2756 struct window *w;
2757 int width_p, ignore_fixed_p, *fixed;
2759 int size, fixed_p;
2761 if (ignore_fixed_p)
2762 fixed_p = 0;
2763 else
2764 fixed_p = window_fixed_size_p (w, width_p, 1);
2766 if (fixed)
2767 *fixed = fixed_p;
2769 if (fixed_p)
2770 size = width_p ? XFASTINT (w->total_cols) : XFASTINT (w->total_lines);
2771 else
2772 size = window_min_size_1 (w, width_p);
2774 return size;
2778 /* Adjust the margins of window W if text area is too small.
2779 Return 1 if window width is ok after adjustment; 0 if window
2780 is still too narrow. */
2782 static int
2783 adjust_window_margins (w)
2784 struct window *w;
2786 int box_cols = (WINDOW_TOTAL_COLS (w)
2787 - WINDOW_FRINGE_COLS (w)
2788 - WINDOW_SCROLL_BAR_COLS (w));
2789 int margin_cols = (WINDOW_LEFT_MARGIN_COLS (w)
2790 + WINDOW_RIGHT_MARGIN_COLS (w));
2792 if (box_cols - margin_cols >= MIN_SAFE_WINDOW_WIDTH)
2793 return 1;
2795 if (margin_cols < 0 || box_cols < MIN_SAFE_WINDOW_WIDTH)
2796 return 0;
2798 /* Window's text area is too narrow, but reducing the window
2799 margins will fix that. */
2800 margin_cols = box_cols - MIN_SAFE_WINDOW_WIDTH;
2801 if (WINDOW_RIGHT_MARGIN_COLS (w) > 0)
2803 if (WINDOW_LEFT_MARGIN_COLS (w) > 0)
2804 w->left_margin_cols = w->right_margin_cols
2805 = make_number (margin_cols/2);
2806 else
2807 w->right_margin_cols = make_number (margin_cols);
2809 else
2810 w->left_margin_cols = make_number (margin_cols);
2811 return 1;
2814 /* Calculate new sizes for windows in the list FORWARD when the window size
2815 goes from TOTAL to SIZE. TOTAL must be greater than SIZE.
2816 The number of windows in FORWARD is NCHILDREN, and the number that
2817 can shrink is SHRINKABLE.
2818 The minimum size a window can have is MIN_SIZE.
2819 If we are shrinking fixed windows, RESIZE_FIXED_P is non-zero.
2820 If we are shrinking columns, WIDTH_P is non-zero, otherwise we are
2821 shrinking rows.
2823 This function returns an allocated array of new sizes that the caller
2824 must free. The size -1 means the window is fixed and RESIZE_FIXED_P
2825 is zero. Array index 0 refers to the first window in FORWARD, 1 to
2826 the second, and so on.
2828 This function tries to keep windows at least at the minimum size
2829 and resize other windows before it resizes any window to zero (i.e.
2830 delete that window).
2832 Windows are resized proportional to their size, so bigger windows
2833 shrink more than smaller windows. */
2834 static int *
2835 shrink_windows (total, size, nchildren, shrinkable,
2836 min_size, resize_fixed_p, forward, width_p)
2837 int total, size, nchildren, shrinkable, min_size;
2838 int resize_fixed_p, width_p;
2839 Lisp_Object forward;
2841 int available_resize = 0;
2842 int *new_sizes;
2843 struct window *c;
2844 Lisp_Object child;
2845 int smallest = total;
2846 int total_removed = 0;
2847 int total_shrink = total - size;
2848 int i;
2850 new_sizes = xmalloc (sizeof (*new_sizes) * nchildren);
2852 for (i = 0, child = forward; !NILP (child); child = c->next, ++i)
2854 int child_size;
2856 c = XWINDOW (child);
2857 child_size = width_p ? XINT (c->total_cols) : XINT (c->total_lines);
2859 if (! resize_fixed_p && window_fixed_size_p (c, width_p, 0))
2860 new_sizes[i] = -1;
2861 else
2863 new_sizes[i] = child_size;
2864 if (child_size > min_size)
2865 available_resize += child_size - min_size;
2868 /* We might need to shrink some windows to zero. Find the smallest
2869 windows and set them to 0 until we can fulfil the new size. */
2871 while (shrinkable > 1 && size + available_resize < total)
2873 for (i = 0; i < nchildren; ++i)
2874 if (new_sizes[i] > 0 && smallest > new_sizes[i])
2875 smallest = new_sizes[i];
2877 for (i = 0; i < nchildren; ++i)
2878 if (new_sizes[i] == smallest)
2880 /* Resize this window down to zero. */
2881 new_sizes[i] = 0;
2882 if (smallest > min_size)
2883 available_resize -= smallest - min_size;
2884 available_resize += smallest;
2885 --shrinkable;
2886 total_removed += smallest;
2888 /* We don't know what the smallest is now. */
2889 smallest = total;
2891 /* Out of for, just remove one window at the time and
2892 check again if we have enough space. */
2893 break;
2897 /* Now, calculate the new sizes. Try to shrink each window
2898 proportional to its size. */
2899 for (i = 0; i < nchildren; ++i)
2901 if (new_sizes[i] > min_size)
2903 int to_shrink = total_shrink*new_sizes[i]/total;
2904 if (new_sizes[i] - to_shrink < min_size)
2905 to_shrink = new_sizes[i] - min_size;
2906 new_sizes[i] -= to_shrink;
2907 total_removed += to_shrink;
2911 /* Any reminder due to rounding, we just subtract from windows
2912 that are left and still can be shrunk. */
2913 while (total_shrink > total_removed)
2915 int nonzero_sizes = 0;
2916 int nonzero_idx = -1;
2918 for (i = 0; i < nchildren; ++i)
2919 if (new_sizes[i] > 0)
2921 ++nonzero_sizes;
2922 nonzero_idx = i;
2925 for (i = 0; i < nchildren; ++i)
2926 if (new_sizes[i] > min_size)
2928 --new_sizes[i];
2929 ++total_removed;
2931 /* Out of for, just shrink one window at the time and
2932 check again if we have enough space. */
2933 break;
2937 /* Special case, only one window left. */
2938 if (nonzero_sizes == 1)
2939 break;
2942 /* Any surplus due to rounding, we add to windows that are left. */
2943 while (total_shrink < total_removed)
2945 for (i = 0; i < nchildren; ++i)
2947 if (new_sizes[i] != 0 && total_shrink < total_removed)
2949 ++new_sizes[i];
2950 --total_removed;
2951 break;
2956 return new_sizes;
2959 /* Set WINDOW's height or width to SIZE. WIDTH_P non-zero means set
2960 WINDOW's width. Resize WINDOW's children, if any, so that they
2961 keep their proportionate size relative to WINDOW.
2963 If FIRST_ONLY is 1, change only the first of WINDOW's children when
2964 they are in series. If LAST_ONLY is 1, change only the last of
2965 WINDOW's children when they are in series.
2967 Propagate WINDOW's top or left edge position to children. Delete
2968 windows that become too small unless NODELETE_P is non-zero.
2970 If NODELETE_P is 2, that means we do delete windows that are
2971 too small, even if they were too small before! */
2973 static void
2974 size_window (window, size, width_p, nodelete_p, first_only, last_only)
2975 Lisp_Object window;
2976 int size, width_p, nodelete_p;
2977 int first_only, last_only;
2979 struct window *w = XWINDOW (window);
2980 struct window *c;
2981 Lisp_Object child, *forward, *sideward;
2982 int old_size, min_size, safe_min_size;
2984 /* We test nodelete_p != 2 and nodelete_p != 1 below, so it
2985 seems like it's too soon to do this here. ++KFS. */
2986 if (nodelete_p == 2)
2987 nodelete_p = 0;
2989 check_min_window_sizes ();
2990 size = max (0, size);
2992 /* If the window has been "too small" at one point,
2993 don't delete it for being "too small" in the future.
2994 Preserve it as long as that is at all possible. */
2995 if (width_p)
2997 old_size = WINDOW_TOTAL_COLS (w);
2998 min_size = window_min_width;
2999 /* Ensure that there is room for the scroll bar and fringes!
3000 We may reduce display margins though. */
3001 safe_min_size = (MIN_SAFE_WINDOW_WIDTH
3002 + WINDOW_FRINGE_COLS (w)
3003 + WINDOW_SCROLL_BAR_COLS (w));
3005 else
3007 old_size = XINT (w->total_lines);
3008 min_size = window_min_height;
3009 safe_min_size = MIN_SAFE_WINDOW_HEIGHT;
3012 if (old_size < min_size && nodelete_p != 2)
3013 w->too_small_ok = Qt;
3015 /* Maybe delete WINDOW if it's too small. */
3016 if (nodelete_p != 1 && !NILP (w->parent))
3018 if (!MINI_WINDOW_P (w) && !NILP (w->too_small_ok))
3019 min_size = width_p ? MIN_SAFE_WINDOW_WIDTH : MIN_SAFE_WINDOW_HEIGHT;
3020 if (min_size < safe_min_size)
3021 min_size = safe_min_size;
3022 if (size < min_size)
3024 delete_window (window);
3025 return;
3029 /* Set redisplay hints. */
3030 w->last_modified = make_number (0);
3031 w->last_overlay_modified = make_number (0);
3032 windows_or_buffers_changed++;
3033 FRAME_WINDOW_SIZES_CHANGED (XFRAME (w->frame)) = 1;
3035 if (width_p)
3037 sideward = &w->vchild;
3038 forward = &w->hchild;
3039 w->total_cols = make_number (size);
3040 adjust_window_margins (w);
3042 else
3044 sideward = &w->hchild;
3045 forward = &w->vchild;
3046 w->total_lines = make_number (size);
3047 w->orig_total_lines = Qnil;
3050 if (!NILP (*sideward))
3052 /* We have a chain of parallel siblings whose size should all change. */
3053 for (child = *sideward; !NILP (child); child = c->next)
3055 c = XWINDOW (child);
3056 if (width_p)
3057 c->left_col = w->left_col;
3058 else
3059 c->top_line = w->top_line;
3060 size_window (child, size, width_p, nodelete_p,
3061 first_only, last_only);
3064 else if (!NILP (*forward) && last_only)
3066 /* Change the last in a series of siblings. */
3067 Lisp_Object last_child;
3068 int child_size;
3070 for (child = *forward; !NILP (child); child = c->next)
3072 c = XWINDOW (child);
3073 last_child = child;
3076 child_size = XINT (width_p ? c->total_cols : c->total_lines);
3077 size_window (last_child,
3078 size - old_size + child_size,
3079 width_p, nodelete_p, first_only, last_only);
3081 else if (!NILP (*forward) && first_only)
3083 /* Change the first in a series of siblings. */
3084 int child_size;
3086 child = *forward;
3087 c = XWINDOW (child);
3089 if (width_p)
3090 c->left_col = w->left_col;
3091 else
3092 c->top_line = w->top_line;
3094 child_size = XINT (width_p ? c->total_cols : c->total_lines);
3095 size_window (child,
3096 size - old_size + child_size,
3097 width_p, nodelete_p, first_only, last_only);
3099 else if (!NILP (*forward))
3101 int fixed_size, each, extra, n;
3102 int resize_fixed_p, nfixed;
3103 int last_pos, first_pos, nchildren, total;
3104 int *new_sizes = NULL;
3106 /* Determine the fixed-size portion of this window, and the
3107 number of child windows. */
3108 fixed_size = nchildren = nfixed = total = 0;
3109 for (child = *forward; !NILP (child); child = c->next, ++nchildren)
3111 int child_size;
3113 c = XWINDOW (child);
3114 child_size = width_p ? XINT (c->total_cols) : XINT (c->total_lines);
3115 total += child_size;
3117 if (window_fixed_size_p (c, width_p, 0))
3119 fixed_size += child_size;
3120 ++nfixed;
3124 /* If the new size is smaller than fixed_size, or if there
3125 aren't any resizable windows, allow resizing fixed-size
3126 windows. */
3127 resize_fixed_p = nfixed == nchildren || size < fixed_size;
3129 /* Compute how many lines/columns to add/remove to each child. The
3130 value of extra takes care of rounding errors. */
3131 n = resize_fixed_p ? nchildren : nchildren - nfixed;
3132 if (size < total && n > 1)
3133 new_sizes = shrink_windows (total, size, nchildren, n, min_size,
3134 resize_fixed_p, *forward, width_p);
3135 else
3137 each = (size - total) / n;
3138 extra = (size - total) - n * each;
3141 /* Compute new children heights and edge positions. */
3142 first_pos = width_p ? XINT (w->left_col) : XINT (w->top_line);
3143 last_pos = first_pos;
3144 for (n = 0, child = *forward; !NILP (child); child = c->next, ++n)
3146 int new_size, old_size;
3148 c = XWINDOW (child);
3149 old_size = width_p ? XFASTINT (c->total_cols) : XFASTINT (c->total_lines);
3150 new_size = old_size;
3152 /* The top or left edge position of this child equals the
3153 bottom or right edge of its predecessor. */
3154 if (width_p)
3155 c->left_col = make_number (last_pos);
3156 else
3157 c->top_line = make_number (last_pos);
3159 /* If this child can be resized, do it. */
3160 if (resize_fixed_p || !window_fixed_size_p (c, width_p, 0))
3162 new_size = new_sizes ? new_sizes[n] : old_size + each + extra;
3163 extra = 0;
3166 /* Set new height. Note that size_window also propagates
3167 edge positions to children, so it's not a no-op if we
3168 didn't change the child's size. */
3169 size_window (child, new_size, width_p, 1, first_only, last_only);
3171 /* Remember the bottom/right edge position of this child; it
3172 will be used to set the top/left edge of the next child. */
3173 last_pos += new_size;
3176 if (new_sizes) xfree (new_sizes);
3178 /* We should have covered the parent exactly with child windows. */
3179 xassert (size == last_pos - first_pos);
3181 /* Now delete any children that became too small. */
3182 if (!nodelete_p)
3183 for (child = *forward; !NILP (child); child = c->next)
3185 int child_size;
3186 c = XWINDOW (child);
3187 child_size = width_p ? XINT (c->total_cols) : XINT (c->total_lines);
3188 size_window (child, child_size, width_p, 2, first_only, last_only);
3193 /* Set WINDOW's height to HEIGHT, and recursively change the height of
3194 WINDOW's children. NODELETE non-zero means don't delete windows
3195 that become too small in the process. (The caller should check
3196 later and do so if appropriate.) */
3198 void
3199 set_window_height (window, height, nodelete)
3200 Lisp_Object window;
3201 int height;
3202 int nodelete;
3204 size_window (window, height, 0, nodelete, 0, 0);
3208 /* Set WINDOW's width to WIDTH, and recursively change the width of
3209 WINDOW's children. NODELETE non-zero means don't delete windows
3210 that become too small in the process. (The caller should check
3211 later and do so if appropriate.) */
3213 void
3214 set_window_width (window, width, nodelete)
3215 Lisp_Object window;
3216 int width;
3217 int nodelete;
3219 size_window (window, width, 1, nodelete, 0, 0);
3222 /* Change window heights in windows rooted in WINDOW by N lines. */
3224 void
3225 change_window_heights (window, n)
3226 Lisp_Object window;
3227 int n;
3229 struct window *w = XWINDOW (window);
3231 XSETFASTINT (w->top_line, XFASTINT (w->top_line) + n);
3232 XSETFASTINT (w->total_lines, XFASTINT (w->total_lines) - n);
3234 if (INTEGERP (w->orig_top_line))
3235 XSETFASTINT (w->orig_top_line, XFASTINT (w->orig_top_line) + n);
3236 if (INTEGERP (w->orig_total_lines))
3237 XSETFASTINT (w->orig_total_lines, XFASTINT (w->orig_total_lines) - n);
3239 /* Handle just the top child in a vertical split. */
3240 if (!NILP (w->vchild))
3241 change_window_heights (w->vchild, n);
3243 /* Adjust all children in a horizontal split. */
3244 for (window = w->hchild; !NILP (window); window = w->next)
3246 w = XWINDOW (window);
3247 change_window_heights (window, n);
3252 int window_select_count;
3254 Lisp_Object
3255 Fset_window_buffer_unwind (obuf)
3256 Lisp_Object obuf;
3258 Fset_buffer (obuf);
3259 return Qnil;
3262 EXFUN (Fset_window_fringes, 4);
3263 EXFUN (Fset_window_scroll_bars, 4);
3265 /* Make WINDOW display BUFFER as its contents. RUN_HOOKS_P non-zero
3266 means it's allowed to run hooks. See make_frame for a case where
3267 it's not allowed. KEEP_MARGINS_P non-zero means that the current
3268 margins, fringes, and scroll-bar settings of the window are not
3269 reset from the buffer's local settings. */
3271 void
3272 set_window_buffer (window, buffer, run_hooks_p, keep_margins_p)
3273 Lisp_Object window, buffer;
3274 int run_hooks_p, keep_margins_p;
3276 struct window *w = XWINDOW (window);
3277 struct buffer *b = XBUFFER (buffer);
3278 int count = SPECPDL_INDEX ();
3280 w->buffer = buffer;
3282 if (EQ (window, selected_window))
3283 b->last_selected_window = window;
3285 /* Let redisplay errors through. */
3286 b->display_error_modiff = 0;
3288 /* Update time stamps of buffer display. */
3289 if (INTEGERP (b->display_count))
3290 XSETINT (b->display_count, XINT (b->display_count) + 1);
3291 b->display_time = Fcurrent_time ();
3293 XSETFASTINT (w->window_end_pos, 0);
3294 XSETFASTINT (w->window_end_vpos, 0);
3295 bzero (&w->last_cursor, sizeof w->last_cursor);
3296 w->window_end_valid = Qnil;
3297 w->hscroll = w->min_hscroll = make_number (0);
3298 w->vscroll = 0;
3299 set_marker_both (w->pointm, buffer, BUF_PT (b), BUF_PT_BYTE (b));
3300 set_marker_restricted (w->start,
3301 make_number (b->last_window_start),
3302 buffer);
3303 w->start_at_line_beg = Qnil;
3304 w->force_start = Qnil;
3305 XSETFASTINT (w->last_modified, 0);
3306 XSETFASTINT (w->last_overlay_modified, 0);
3307 windows_or_buffers_changed++;
3309 /* We must select BUFFER for running the window-scroll-functions.
3310 If WINDOW is selected, switch permanently.
3311 Otherwise, switch but go back to the ambient buffer afterward. */
3312 if (EQ (window, selected_window))
3313 Fset_buffer (buffer);
3314 /* We can't check ! NILP (Vwindow_scroll_functions) here
3315 because that might itself be a local variable. */
3316 else if (window_initialized)
3318 record_unwind_protect (Fset_window_buffer_unwind, Fcurrent_buffer ());
3319 Fset_buffer (buffer);
3322 if (!keep_margins_p)
3324 /* Set left and right marginal area width etc. from buffer. */
3326 /* This may call adjust_window_margins three times, so
3327 temporarily disable window margins. */
3328 Lisp_Object save_left = w->left_margin_cols;
3329 Lisp_Object save_right = w->right_margin_cols;
3331 w->left_margin_cols = w->right_margin_cols = Qnil;
3333 Fset_window_fringes (window,
3334 b->left_fringe_width, b->right_fringe_width,
3335 b->fringes_outside_margins);
3337 Fset_window_scroll_bars (window,
3338 b->scroll_bar_width,
3339 b->vertical_scroll_bar_type, Qnil);
3341 w->left_margin_cols = save_left;
3342 w->right_margin_cols = save_right;
3344 Fset_window_margins (window,
3345 b->left_margin_cols, b->right_margin_cols);
3348 if (run_hooks_p)
3350 if (! NILP (Vwindow_scroll_functions))
3351 run_hook_with_args_2 (Qwindow_scroll_functions, window,
3352 Fmarker_position (w->start));
3354 if (! NILP (Vwindow_configuration_change_hook)
3355 && ! NILP (Vrun_hooks))
3356 call1 (Vrun_hooks, Qwindow_configuration_change_hook);
3359 unbind_to (count, Qnil);
3363 DEFUN ("set-window-buffer", Fset_window_buffer, Sset_window_buffer, 2, 3, 0,
3364 doc: /* Make WINDOW display BUFFER as its contents.
3365 BUFFER can be a buffer or the name of an existing buffer.
3366 Optional third arg KEEP-MARGINS non-nil means that WINDOW's current
3367 display margins, fringe widths, and scroll bar settings are maintained;
3368 the default is to reset these from BUFFER's local settings or the frame
3369 defaults.
3371 This function runs the hook `window-scroll-functions'. */)
3372 (window, buffer, keep_margins)
3373 register Lisp_Object window, buffer, keep_margins;
3375 register Lisp_Object tem;
3376 register struct window *w = decode_window (window);
3378 XSETWINDOW (window, w);
3379 buffer = Fget_buffer (buffer);
3380 CHECK_BUFFER (buffer);
3382 if (NILP (XBUFFER (buffer)->name))
3383 error ("Attempt to display deleted buffer");
3385 tem = w->buffer;
3386 if (NILP (tem))
3387 error ("Window is deleted");
3388 else if (! EQ (tem, Qt)) /* w->buffer is t when the window
3389 is first being set up. */
3391 if (!NILP (w->dedicated) && !EQ (tem, buffer))
3392 error ("Window is dedicated to `%s'",
3393 SDATA (XBUFFER (tem)->name));
3395 unshow_buffer (w);
3398 set_window_buffer (window, buffer, 1, !NILP (keep_margins));
3399 return Qnil;
3402 /* Note that selected_window can be nil
3403 when this is called from Fset_window_configuration. */
3405 DEFUN ("select-window", Fselect_window, Sselect_window, 1, 2, 0,
3406 doc: /* Select WINDOW. Most editing will apply to WINDOW's buffer.
3407 If WINDOW is not already selected, make WINDOW's buffer current
3408 and make WINDOW the frame's selected window. Return WINDOW.
3409 Optional second arg NORECORD non-nil means
3410 do not put this buffer at the front of the list of recently selected ones.
3412 Note that the main editor command loop
3413 selects the buffer of the selected window before each command. */)
3414 (window, norecord)
3415 register Lisp_Object window, norecord;
3417 register struct window *w;
3418 register struct window *ow;
3419 struct frame *sf;
3421 CHECK_LIVE_WINDOW (window);
3423 w = XWINDOW (window);
3424 w->frozen_window_start_p = 0;
3426 ++window_select_count;
3427 XSETFASTINT (w->use_time, window_select_count);
3428 if (EQ (window, selected_window))
3429 return window;
3431 /* Store the current buffer's actual point into the
3432 old selected window. It belongs to that window,
3433 and when the window is not selected, must be in the window. */
3434 if (!NILP (selected_window))
3436 ow = XWINDOW (selected_window);
3437 if (! NILP (ow->buffer))
3438 set_marker_both (ow->pointm, ow->buffer,
3439 BUF_PT (XBUFFER (ow->buffer)),
3440 BUF_PT_BYTE (XBUFFER (ow->buffer)));
3443 selected_window = window;
3444 sf = SELECTED_FRAME ();
3445 if (XFRAME (WINDOW_FRAME (w)) != sf)
3447 XFRAME (WINDOW_FRAME (w))->selected_window = window;
3448 /* Use this rather than Fhandle_switch_frame
3449 so that FRAME_FOCUS_FRAME is moved appropriately as we
3450 move around in the state where a minibuffer in a separate
3451 frame is active. */
3452 Fselect_frame (WINDOW_FRAME (w));
3454 else
3455 sf->selected_window = window;
3457 if (NILP (norecord))
3458 record_buffer (w->buffer);
3459 Fset_buffer (w->buffer);
3461 XBUFFER (w->buffer)->last_selected_window = window;
3463 /* Go to the point recorded in the window.
3464 This is important when the buffer is in more
3465 than one window. It also matters when
3466 redisplay_window has altered point after scrolling,
3467 because it makes the change only in the window. */
3469 register int new_point = marker_position (w->pointm);
3470 if (new_point < BEGV)
3471 SET_PT (BEGV);
3472 else if (new_point > ZV)
3473 SET_PT (ZV);
3474 else
3475 SET_PT (new_point);
3478 windows_or_buffers_changed++;
3479 return window;
3482 static Lisp_Object
3483 select_window_norecord (window)
3484 Lisp_Object window;
3486 return Fselect_window (window, Qt);
3489 /* Deiconify the frame containing the window WINDOW,
3490 unless it is the selected frame;
3491 then return WINDOW.
3493 The reason for the exception for the selected frame
3494 is that it seems better not to change the selected frames visibility
3495 merely because of displaying a different buffer in it.
3496 The deiconification is useful when a buffer gets shown in
3497 another frame that you were not using lately. */
3499 static Lisp_Object
3500 display_buffer_1 (window)
3501 Lisp_Object window;
3503 Lisp_Object frame = XWINDOW (window)->frame;
3504 FRAME_PTR f = XFRAME (frame);
3506 FRAME_SAMPLE_VISIBILITY (f);
3508 if (EQ (frame, selected_frame))
3509 ; /* Assume the selected frame is already visible enough. */
3510 else if (minibuf_level > 0
3511 && MINI_WINDOW_P (XWINDOW (selected_window))
3512 && WINDOW_LIVE_P (minibuf_selected_window)
3513 && EQ (frame, WINDOW_FRAME (XWINDOW (minibuf_selected_window))))
3514 ; /* Assume the frame from which we invoked the minibuffer is visible. */
3515 else
3517 if (FRAME_ICONIFIED_P (f))
3518 Fmake_frame_visible (frame);
3519 else if (FRAME_VISIBLE_P (f))
3520 Fraise_frame (frame);
3523 return window;
3526 DEFUN ("special-display-p", Fspecial_display_p, Sspecial_display_p, 1, 1, 0,
3527 doc: /* Returns non-nil if a buffer named BUFFER-NAME gets a special frame.
3528 If the value is t, `display-buffer' or `pop-to-buffer' would create a
3529 special frame for that buffer using the default frame parameters.
3531 If the value is a list, it is a list of frame parameters that would be used
3532 to make a frame for that buffer.
3533 The variables `special-display-buffer-names'
3534 and `special-display-regexps' control this. */)
3535 (buffer_name)
3536 Lisp_Object buffer_name;
3538 Lisp_Object tem;
3540 CHECK_STRING (buffer_name);
3542 tem = Fmember (buffer_name, Vspecial_display_buffer_names);
3543 if (!NILP (tem))
3544 return Qt;
3546 tem = Fassoc (buffer_name, Vspecial_display_buffer_names);
3547 if (!NILP (tem))
3548 return XCDR (tem);
3550 for (tem = Vspecial_display_regexps; CONSP (tem); tem = XCDR (tem))
3552 Lisp_Object car = XCAR (tem);
3553 if (STRINGP (car)
3554 && fast_string_match (car, buffer_name) >= 0)
3555 return Qt;
3556 else if (CONSP (car)
3557 && STRINGP (XCAR (car))
3558 && fast_string_match (XCAR (car), buffer_name) >= 0)
3559 return XCDR (car);
3561 return Qnil;
3564 DEFUN ("same-window-p", Fsame_window_p, Ssame_window_p, 1, 1, 0,
3565 doc: /* Returns non-nil if a buffer named BUFFER-NAME would use the same window.
3566 More precisely, if `display-buffer' or `pop-to-buffer' would display
3567 that buffer in the selected window rather than (as usual) in some other window.
3568 See `same-window-buffer-names' and `same-window-regexps'. */)
3569 (buffer_name)
3570 Lisp_Object buffer_name;
3572 Lisp_Object tem;
3574 CHECK_STRING (buffer_name);
3576 tem = Fmember (buffer_name, Vsame_window_buffer_names);
3577 if (!NILP (tem))
3578 return Qt;
3580 tem = Fassoc (buffer_name, Vsame_window_buffer_names);
3581 if (!NILP (tem))
3582 return Qt;
3584 for (tem = Vsame_window_regexps; CONSP (tem); tem = XCDR (tem))
3586 Lisp_Object car = XCAR (tem);
3587 if (STRINGP (car)
3588 && fast_string_match (car, buffer_name) >= 0)
3589 return Qt;
3590 else if (CONSP (car)
3591 && STRINGP (XCAR (car))
3592 && fast_string_match (XCAR (car), buffer_name) >= 0)
3593 return Qt;
3595 return Qnil;
3598 /* Use B so the default is (other-buffer). */
3599 DEFUN ("display-buffer", Fdisplay_buffer, Sdisplay_buffer, 1, 3,
3600 "BDisplay buffer: \nP",
3601 doc: /* Make BUFFER appear in some window but don't select it.
3602 BUFFER must be the name of an existing buffer, or, when called from Lisp,
3603 a buffer.
3604 If BUFFER is shown already in some window, just use that one,
3605 unless the window is the selected window and the optional second
3606 argument NOT-THIS-WINDOW is non-nil (interactively, with prefix arg).
3607 If `pop-up-frames' is non-nil, make a new frame if no window shows BUFFER.
3608 Returns the window displaying BUFFER.
3609 If `display-buffer-reuse-frames' is non-nil, and another frame is currently
3610 displaying BUFFER, then simply raise that frame.
3612 The variables `special-display-buffer-names',
3613 `special-display-regexps', `same-window-buffer-names', and
3614 `same-window-regexps' customize how certain buffer names are handled.
3615 The latter two take effect only if NOT-THIS-WINDOW is nil.
3617 If optional argument FRAME is `visible', check all visible frames
3618 for a window to use.
3619 If FRAME is 0, check all visible and iconified frames.
3620 If FRAME is t, check all frames.
3621 If FRAME is a frame, check only that frame.
3622 If FRAME is nil, check only the selected frame
3623 (actually the last nonminibuffer frame),
3624 unless `pop-up-frames' or `display-buffer-reuse-frames' is non-nil,
3625 which means search visible and iconified frames.
3627 If a full-width window on a splittable frame is available to display
3628 the buffer, it may be split, subject to the value of the variable
3629 `split-height-threshold'.
3631 If `even-window-heights' is non-nil, window heights will be evened out
3632 if displaying the buffer causes two vertically adjacent windows to be
3633 displayed. */)
3634 (buffer, not_this_window, frame)
3635 register Lisp_Object buffer, not_this_window, frame;
3637 register Lisp_Object window, tem, swp;
3638 struct frame *f;
3640 swp = Qnil;
3641 buffer = Fget_buffer (buffer);
3642 CHECK_BUFFER (buffer);
3644 if (!NILP (Vdisplay_buffer_function))
3645 return call2 (Vdisplay_buffer_function, buffer, not_this_window);
3647 if (NILP (not_this_window)
3648 && XBUFFER (XWINDOW (selected_window)->buffer) == XBUFFER (buffer))
3649 return display_buffer_1 (selected_window);
3651 /* See if the user has specified this buffer should appear
3652 in the selected window. */
3653 if (NILP (not_this_window))
3655 swp = Fsame_window_p (XBUFFER (buffer)->name);
3656 if (!NILP (swp) && !no_switch_window (selected_window))
3658 Fswitch_to_buffer (buffer, Qnil);
3659 return display_buffer_1 (selected_window);
3663 /* If the user wants pop-up-frames or display-buffer-reuse-frames,
3664 look for a window showing BUFFER on any visible or iconified frame.
3665 Otherwise search only the current frame. */
3666 if (! NILP (frame))
3667 tem = frame;
3668 else if (pop_up_frames
3669 || display_buffer_reuse_frames
3670 || last_nonminibuf_frame == 0)
3671 XSETFASTINT (tem, 0);
3672 else
3673 XSETFRAME (tem, last_nonminibuf_frame);
3675 window = Fget_buffer_window (buffer, tem);
3676 if (!NILP (window)
3677 && (NILP (not_this_window) || !EQ (window, selected_window)))
3678 return display_buffer_1 (window);
3680 /* Certain buffer names get special handling. */
3681 if (!NILP (Vspecial_display_function) && NILP (swp))
3683 tem = Fspecial_display_p (XBUFFER (buffer)->name);
3684 if (EQ (tem, Qt))
3685 return call1 (Vspecial_display_function, buffer);
3686 if (CONSP (tem))
3687 return call2 (Vspecial_display_function, buffer, tem);
3690 /* If there are no frames open that have more than a minibuffer,
3691 we need to create a new frame. */
3692 if (pop_up_frames || last_nonminibuf_frame == 0)
3694 window = Fframe_selected_window (call0 (Vpop_up_frame_function));
3695 Fset_window_buffer (window, buffer, Qnil);
3696 return display_buffer_1 (window);
3699 f = SELECTED_FRAME ();
3700 if (pop_up_windows
3701 || FRAME_MINIBUF_ONLY_P (f)
3702 /* If the current frame is a special display frame,
3703 don't try to reuse its windows. */
3704 || !NILP (XWINDOW (FRAME_ROOT_WINDOW (f))->dedicated))
3706 Lisp_Object frames;
3708 frames = Qnil;
3709 if (FRAME_MINIBUF_ONLY_P (f))
3710 XSETFRAME (frames, last_nonminibuf_frame);
3711 /* Don't try to create a window if we would get an error. */
3712 if (split_height_threshold < window_min_height << 1)
3713 split_height_threshold = window_min_height << 1;
3715 /* Note that both Fget_largest_window and Fget_lru_window
3716 ignore minibuffers and dedicated windows.
3717 This means they can return nil. */
3719 /* If the frame we would try to split cannot be split,
3720 try other frames. */
3721 if (FRAME_NO_SPLIT_P (NILP (frames) ? f : last_nonminibuf_frame))
3723 /* Try visible frames first. */
3724 window = Fget_largest_window (Qvisible, Qt);
3725 /* If that didn't work, try iconified frames. */
3726 if (NILP (window))
3727 window = Fget_largest_window (make_number (0), Qt);
3728 #if 0 /* Don't try windows on other displays. */
3729 if (NILP (window))
3730 window = Fget_largest_window (Qt, Qt);
3731 #endif
3733 else
3734 window = Fget_largest_window (frames, Qt);
3736 /* If we got a tall enough full-width window that can be split,
3737 split it. */
3738 if (!NILP (window)
3739 && ! FRAME_NO_SPLIT_P (XFRAME (XWINDOW (window)->frame))
3740 && window_height (window) >= split_height_threshold
3741 && WINDOW_FULL_WIDTH_P (XWINDOW (window)))
3742 window = Fsplit_window (window, Qnil, Qnil);
3743 else
3745 Lisp_Object upper, lower, other;
3747 window = Fget_lru_window (frames, Qt);
3748 /* If the LRU window is selected, and big enough,
3749 and can be split, split it. */
3750 if (!NILP (window)
3751 && ! FRAME_NO_SPLIT_P (XFRAME (XWINDOW (window)->frame))
3752 && (EQ (window, selected_window)
3753 || EQ (XWINDOW (window)->parent, Qnil))
3754 && window_height (window) >= window_min_height << 1)
3755 window = Fsplit_window (window, Qnil, Qnil);
3756 else
3757 window = Fget_lru_window (frames, Qnil);
3758 /* If Fget_lru_window returned nil, try other approaches. */
3760 /* Try visible frames first. */
3761 if (NILP (window))
3762 window = Fget_buffer_window (buffer, Qvisible);
3763 if (NILP (window))
3764 window = Fget_largest_window (Qvisible, Qnil);
3765 /* If that didn't work, try iconified frames. */
3766 if (NILP (window))
3767 window = Fget_buffer_window (buffer, make_number (0));
3768 if (NILP (window))
3769 window = Fget_largest_window (make_number (0), Qnil);
3771 #if 0 /* Don't try frames on other displays. */
3772 if (NILP (window))
3773 window = Fget_buffer_window (buffer, Qt);
3774 if (NILP (window))
3775 window = Fget_largest_window (Qt, Qnil);
3776 #endif
3777 /* As a last resort, make a new frame. */
3778 if (NILP (window))
3779 window = Fframe_selected_window (call0 (Vpop_up_frame_function));
3780 /* If window appears above or below another,
3781 even out their heights. */
3782 other = upper = lower = Qnil;
3783 if (!NILP (XWINDOW (window)->prev))
3784 other = upper = XWINDOW (window)->prev, lower = window;
3785 if (!NILP (XWINDOW (window)->next))
3786 other = lower = XWINDOW (window)->next, upper = window;
3787 if (!NILP (other)
3788 && !NILP (Veven_window_heights)
3789 /* Check that OTHER and WINDOW are vertically arrayed. */
3790 && !EQ (XWINDOW (other)->top_line, XWINDOW (window)->top_line)
3791 && (XFASTINT (XWINDOW (other)->total_lines)
3792 > XFASTINT (XWINDOW (window)->total_lines)))
3794 int total = (XFASTINT (XWINDOW (other)->total_lines)
3795 + XFASTINT (XWINDOW (window)->total_lines));
3796 enlarge_window (upper,
3797 total / 2 - XFASTINT (XWINDOW (upper)->total_lines),
3802 else
3803 window = Fget_lru_window (Qnil, Qnil);
3805 Fset_window_buffer (window, buffer, Qnil);
3806 return display_buffer_1 (window);
3810 DEFUN ("force-window-update", Fforce_window_update, Sforce_window_update,
3811 0, 1, 0,
3812 doc: /* Force all windows to be updated on next redisplay.
3813 If optional arg OBJECT is a window, force redisplay of that window only.
3814 If OBJECT is a buffer or buffer name, force redisplay of all windows
3815 displaying that buffer. */)
3816 (object)
3817 Lisp_Object object;
3819 if (NILP (object))
3821 windows_or_buffers_changed++;
3822 update_mode_lines++;
3823 return Qt;
3826 if (WINDOWP (object))
3828 struct window *w = XWINDOW (object);
3829 mark_window_display_accurate (object, 0);
3830 w->update_mode_line = Qt;
3831 if (BUFFERP (w->buffer))
3832 XBUFFER (w->buffer)->prevent_redisplay_optimizations_p = 1;
3833 ++update_mode_lines;
3834 return Qt;
3837 if (STRINGP (object))
3838 object = Fget_buffer (object);
3839 if (BUFFERP (object) && !NILP (XBUFFER (object)->name))
3841 /* Walk all windows looking for buffer, and force update
3842 of each of those windows. */
3844 object = window_loop (REDISPLAY_BUFFER_WINDOWS, object, 0, Qvisible);
3845 return NILP (object) ? Qnil : Qt;
3848 /* If nothing suitable was found, just return.
3849 We could signal an error, but this feature will typically be used
3850 asynchronously in timers or process sentinels, so we don't. */
3851 return Qnil;
3855 void
3856 temp_output_buffer_show (buf)
3857 register Lisp_Object buf;
3859 register struct buffer *old = current_buffer;
3860 register Lisp_Object window;
3861 register struct window *w;
3863 XBUFFER (buf)->directory = current_buffer->directory;
3865 Fset_buffer (buf);
3866 BUF_SAVE_MODIFF (XBUFFER (buf)) = MODIFF;
3867 BEGV = BEG;
3868 ZV = Z;
3869 SET_PT (BEG);
3870 #if 0 /* rms: there should be no reason for this. */
3871 XBUFFER (buf)->prevent_redisplay_optimizations_p = 1;
3872 #endif
3873 set_buffer_internal (old);
3875 if (!NILP (Vtemp_buffer_show_function))
3876 call1 (Vtemp_buffer_show_function, buf);
3877 else
3879 window = Fdisplay_buffer (buf, Qnil, Qnil);
3881 if (!EQ (XWINDOW (window)->frame, selected_frame))
3882 Fmake_frame_visible (WINDOW_FRAME (XWINDOW (window)));
3883 Vminibuf_scroll_window = window;
3884 w = XWINDOW (window);
3885 XSETFASTINT (w->hscroll, 0);
3886 XSETFASTINT (w->min_hscroll, 0);
3887 set_marker_restricted_both (w->start, buf, BEG, BEG);
3888 set_marker_restricted_both (w->pointm, buf, BEG, BEG);
3890 /* Run temp-buffer-show-hook, with the chosen window selected
3891 and its buffer current. */
3893 if (!NILP (Vrun_hooks)
3894 && !NILP (Fboundp (Qtemp_buffer_show_hook))
3895 && !NILP (Fsymbol_value (Qtemp_buffer_show_hook)))
3897 int count = SPECPDL_INDEX ();
3898 Lisp_Object prev_window, prev_buffer;
3899 prev_window = selected_window;
3900 XSETBUFFER (prev_buffer, old);
3902 /* Select the window that was chosen, for running the hook.
3903 Note: Both Fselect_window and select_window_norecord may
3904 set-buffer to the buffer displayed in the window,
3905 so we need to save the current buffer. --stef */
3906 record_unwind_protect (Fset_buffer, prev_buffer);
3907 record_unwind_protect (select_window_norecord, prev_window);
3908 Fselect_window (window, Qt);
3909 Fset_buffer (w->buffer);
3910 call1 (Vrun_hooks, Qtemp_buffer_show_hook);
3911 unbind_to (count, Qnil);
3916 static void
3917 make_dummy_parent (window)
3918 Lisp_Object window;
3920 Lisp_Object new;
3921 register struct window *o, *p;
3922 int i;
3924 o = XWINDOW (window);
3925 p = allocate_window ();
3926 for (i = 0; i < VECSIZE (struct window); ++i)
3927 ((struct Lisp_Vector *) p)->contents[i]
3928 = ((struct Lisp_Vector *)o)->contents[i];
3929 XSETWINDOW (new, p);
3931 ++sequence_number;
3932 XSETFASTINT (p->sequence_number, sequence_number);
3934 /* Put new into window structure in place of window */
3935 replace_window (window, new);
3937 o->next = Qnil;
3938 o->prev = Qnil;
3939 o->vchild = Qnil;
3940 o->hchild = Qnil;
3941 o->parent = new;
3943 p->start = Qnil;
3944 p->pointm = Qnil;
3945 p->buffer = Qnil;
3948 DEFUN ("split-window", Fsplit_window, Ssplit_window, 0, 3, "",
3949 doc: /* Split WINDOW, putting SIZE lines in the first of the pair.
3950 WINDOW defaults to selected one and SIZE to half its size.
3951 If optional third arg HORFLAG is non-nil, split side by side
3952 and put SIZE columns in the first of the pair. In that case,
3953 SIZE includes that window's scroll bar, or the divider column to its right.
3954 Interactively, all arguments are nil.
3956 Returns the newly created window (which is the lower or rightmost one).
3957 The upper or leftmost window is the original one, and remains selected
3958 if it was selected before.
3960 See Info node `(elisp)Splitting Windows' for more details and examples.*/)
3961 (window, size, horflag)
3962 Lisp_Object window, size, horflag;
3964 register Lisp_Object new;
3965 register struct window *o, *p;
3966 FRAME_PTR fo;
3967 register int size_int;
3969 if (NILP (window))
3970 window = selected_window;
3971 else
3972 CHECK_LIVE_WINDOW (window);
3974 o = XWINDOW (window);
3975 fo = XFRAME (WINDOW_FRAME (o));
3977 if (NILP (size))
3979 if (!NILP (horflag))
3980 /* Calculate the size of the left-hand window, by dividing
3981 the usable space in columns by two.
3982 We round up, since the left-hand window may include
3983 a dividing line, while the right-hand may not. */
3984 size_int = (XFASTINT (o->total_cols) + 1) >> 1;
3985 else
3986 size_int = XFASTINT (o->total_lines) >> 1;
3988 else
3990 CHECK_NUMBER (size);
3991 size_int = XINT (size);
3994 if (MINI_WINDOW_P (o))
3995 error ("Attempt to split minibuffer window");
3996 else if (window_fixed_size_p (o, !NILP (horflag), 0))
3997 error ("Attempt to split fixed-size window");
3999 check_min_window_sizes ();
4001 if (NILP (horflag))
4003 if (size_int < window_min_height)
4004 error ("Window height %d too small (after splitting)", size_int);
4005 if (size_int + window_min_height > XFASTINT (o->total_lines))
4006 error ("Window height %d too small (after splitting)",
4007 XFASTINT (o->total_lines) - size_int);
4008 if (NILP (o->parent)
4009 || NILP (XWINDOW (o->parent)->vchild))
4011 make_dummy_parent (window);
4012 new = o->parent;
4013 XWINDOW (new)->vchild = window;
4016 else
4018 if (size_int < window_min_width)
4019 error ("Window width %d too small (after splitting)", size_int);
4021 if (size_int + window_min_width > XFASTINT (o->total_cols))
4022 error ("Window width %d too small (after splitting)",
4023 XFASTINT (o->total_cols) - size_int);
4024 if (NILP (o->parent)
4025 || NILP (XWINDOW (o->parent)->hchild))
4027 make_dummy_parent (window);
4028 new = o->parent;
4029 XWINDOW (new)->hchild = window;
4033 /* Now we know that window's parent is a vertical combination
4034 if we are dividing vertically, or a horizontal combination
4035 if we are making side-by-side windows */
4037 windows_or_buffers_changed++;
4038 FRAME_WINDOW_SIZES_CHANGED (fo) = 1;
4039 new = make_window ();
4040 p = XWINDOW (new);
4042 p->frame = o->frame;
4043 p->next = o->next;
4044 if (!NILP (p->next))
4045 XWINDOW (p->next)->prev = new;
4046 p->prev = window;
4047 o->next = new;
4048 p->parent = o->parent;
4049 p->buffer = Qt;
4050 p->window_end_valid = Qnil;
4051 bzero (&p->last_cursor, sizeof p->last_cursor);
4053 /* Duplicate special geometry settings. */
4055 p->left_margin_cols = o->left_margin_cols;
4056 p->right_margin_cols = o->right_margin_cols;
4057 p->left_fringe_width = o->left_fringe_width;
4058 p->right_fringe_width = o->right_fringe_width;
4059 p->fringes_outside_margins = o->fringes_outside_margins;
4060 p->scroll_bar_width = o->scroll_bar_width;
4061 p->vertical_scroll_bar_type = o->vertical_scroll_bar_type;
4063 /* Apportion the available frame space among the two new windows */
4065 if (!NILP (horflag))
4067 p->total_lines = o->total_lines;
4068 p->top_line = o->top_line;
4069 XSETFASTINT (p->total_cols, XFASTINT (o->total_cols) - size_int);
4070 XSETFASTINT (o->total_cols, size_int);
4071 XSETFASTINT (p->left_col, XFASTINT (o->left_col) + size_int);
4072 adjust_window_margins (p);
4073 adjust_window_margins (o);
4075 else
4077 p->left_col = o->left_col;
4078 p->total_cols = o->total_cols;
4079 XSETFASTINT (p->total_lines, XFASTINT (o->total_lines) - size_int);
4080 XSETFASTINT (o->total_lines, size_int);
4081 XSETFASTINT (p->top_line, XFASTINT (o->top_line) + size_int);
4084 /* Adjust glyph matrices. */
4085 adjust_glyphs (fo);
4087 Fset_window_buffer (new, o->buffer, Qt);
4088 return new;
4091 DEFUN ("enlarge-window", Fenlarge_window, Senlarge_window, 1, 2, "p",
4092 doc: /* Make current window ARG lines bigger.
4093 From program, optional second arg non-nil means grow sideways ARG columns.
4094 Interactively, if an argument is not given, make the window one line bigger.
4095 If HORIZONTAL is non-nil, enlarge horizontally instead of vertically.
4096 This function can delete windows, even the second window, if they get
4097 too small. */)
4098 (arg, horizontal)
4099 Lisp_Object arg, horizontal;
4101 CHECK_NUMBER (arg);
4102 enlarge_window (selected_window, XINT (arg), !NILP (horizontal));
4104 if (! NILP (Vwindow_configuration_change_hook))
4105 call1 (Vrun_hooks, Qwindow_configuration_change_hook);
4107 return Qnil;
4110 DEFUN ("shrink-window", Fshrink_window, Sshrink_window, 1, 2, "p",
4111 doc: /* Make current window ARG lines smaller.
4112 From program, optional second arg non-nil means shrink sideways arg columns.
4113 Interactively, if an argument is not given, make the window one line smaller. Only
4114 siblings to the right or below are changed. */)
4115 (arg, side)
4116 Lisp_Object arg, side;
4118 CHECK_NUMBER (arg);
4119 enlarge_window (selected_window, -XINT (arg), !NILP (side));
4121 if (! NILP (Vwindow_configuration_change_hook))
4122 call1 (Vrun_hooks, Qwindow_configuration_change_hook);
4124 return Qnil;
4128 window_height (window)
4129 Lisp_Object window;
4131 register struct window *p = XWINDOW (window);
4132 return WINDOW_TOTAL_LINES (p);
4136 window_width (window)
4137 Lisp_Object window;
4139 register struct window *p = XWINDOW (window);
4140 return WINDOW_TOTAL_COLS (p);
4144 #define CURBEG(w) \
4145 *(horiz_flag ? &(XWINDOW (w)->left_col) : &(XWINDOW (w)->top_line))
4147 #define CURSIZE(w) \
4148 *(horiz_flag ? &(XWINDOW (w)->total_cols) : &(XWINDOW (w)->total_lines))
4151 /* Enlarge WINDOW by DELTA.
4152 HORIZ_FLAG nonzero means enlarge it horizontally;
4153 zero means do it vertically.
4155 Siblings of the selected window are resized to fulfill the size
4156 request. If they become too small in the process, they will be
4157 deleted. */
4159 static void
4160 enlarge_window (window, delta, horiz_flag)
4161 Lisp_Object window;
4162 int delta, horiz_flag;
4164 Lisp_Object parent, next, prev;
4165 struct window *p;
4166 Lisp_Object *sizep;
4167 int maximum;
4168 int (*sizefun) P_ ((Lisp_Object))
4169 = horiz_flag ? window_width : window_height;
4170 void (*setsizefun) P_ ((Lisp_Object, int, int))
4171 = (horiz_flag ? set_window_width : set_window_height);
4173 /* Check values of window_min_width and window_min_height for
4174 validity. */
4175 check_min_window_sizes ();
4177 /* Give up if this window cannot be resized. */
4178 if (window_fixed_size_p (XWINDOW (window), horiz_flag, 1))
4179 error ("Window is not resizable");
4181 /* Find the parent of the selected window. */
4182 while (1)
4184 p = XWINDOW (window);
4185 parent = p->parent;
4187 if (NILP (parent))
4189 if (horiz_flag)
4190 error ("No other window to side of this one");
4191 break;
4194 if (horiz_flag
4195 ? !NILP (XWINDOW (parent)->hchild)
4196 : !NILP (XWINDOW (parent)->vchild))
4197 break;
4199 window = parent;
4202 sizep = &CURSIZE (window);
4205 register int maxdelta;
4207 /* Compute the maximum size increment this window can have. */
4209 maxdelta = (!NILP (parent) ? (*sizefun) (parent) - XINT (*sizep)
4210 /* This is a main window followed by a minibuffer. */
4211 : !NILP (p->next) ? ((*sizefun) (p->next)
4212 - window_min_size (XWINDOW (p->next),
4213 horiz_flag, 0, 0))
4214 /* This is a minibuffer following a main window. */
4215 : !NILP (p->prev) ? ((*sizefun) (p->prev)
4216 - window_min_size (XWINDOW (p->prev),
4217 horiz_flag, 0, 0))
4218 /* This is a frame with only one window, a minibuffer-only
4219 or a minibufferless frame. */
4220 : (delta = 0));
4222 if (delta > maxdelta)
4223 /* This case traps trying to make the minibuffer
4224 the full frame, or make the only window aside from the
4225 minibuffer the full frame. */
4226 delta = maxdelta;
4229 if (XINT (*sizep) + delta < window_min_size (XWINDOW (window), horiz_flag, 0, 0))
4231 delete_window (window);
4232 return;
4235 if (delta == 0)
4236 return;
4238 /* Find the total we can get from other siblings without deleting them. */
4239 maximum = 0;
4240 for (next = p->next; ! NILP (next); next = XWINDOW (next)->next)
4241 maximum += (*sizefun) (next) - window_min_size (XWINDOW (next),
4242 horiz_flag, 0, 0);
4243 for (prev = p->prev; ! NILP (prev); prev = XWINDOW (prev)->prev)
4244 maximum += (*sizefun) (prev) - window_min_size (XWINDOW (prev),
4245 horiz_flag, 0, 0);
4247 /* If we can get it all from them without deleting them, do so. */
4248 if (delta <= maximum)
4250 Lisp_Object first_unaffected;
4251 Lisp_Object first_affected;
4252 int fixed_p;
4254 next = p->next;
4255 prev = p->prev;
4256 first_affected = window;
4257 /* Look at one sibling at a time,
4258 moving away from this window in both directions alternately,
4259 and take as much as we can get without deleting that sibling. */
4260 while (delta != 0
4261 && (!NILP (next) || !NILP (prev)))
4263 if (! NILP (next))
4265 int this_one = ((*sizefun) (next)
4266 - window_min_size (XWINDOW (next),
4267 horiz_flag, 0, &fixed_p));
4268 if (!fixed_p)
4270 if (this_one > delta)
4271 this_one = delta;
4273 (*setsizefun) (next, (*sizefun) (next) - this_one, 0);
4274 (*setsizefun) (window, XINT (*sizep) + this_one, 0);
4276 delta -= this_one;
4279 next = XWINDOW (next)->next;
4282 if (delta == 0)
4283 break;
4285 if (! NILP (prev))
4287 int this_one = ((*sizefun) (prev)
4288 - window_min_size (XWINDOW (prev),
4289 horiz_flag, 0, &fixed_p));
4290 if (!fixed_p)
4292 if (this_one > delta)
4293 this_one = delta;
4295 first_affected = prev;
4297 (*setsizefun) (prev, (*sizefun) (prev) - this_one, 0);
4298 (*setsizefun) (window, XINT (*sizep) + this_one, 0);
4300 delta -= this_one;
4303 prev = XWINDOW (prev)->prev;
4307 xassert (delta == 0);
4309 /* Now recalculate the edge positions of all the windows affected,
4310 based on the new sizes. */
4311 first_unaffected = next;
4312 prev = first_affected;
4313 for (next = XWINDOW (prev)->next; ! EQ (next, first_unaffected);
4314 prev = next, next = XWINDOW (next)->next)
4316 XSETINT (CURBEG (next), XINT (CURBEG (prev)) + (*sizefun) (prev));
4317 /* This does not change size of NEXT,
4318 but it propagates the new top edge to its children */
4319 (*setsizefun) (next, (*sizefun) (next), 0);
4322 else
4324 register int delta1;
4325 register int opht = (*sizefun) (parent);
4327 if (opht <= XINT (*sizep) + delta)
4329 /* If trying to grow this window to or beyond size of the parent,
4330 just delete all the sibling windows. */
4331 Lisp_Object start, tem, next;
4333 start = XWINDOW (parent)->vchild;
4334 if (NILP (start))
4335 start = XWINDOW (parent)->hchild;
4337 /* Delete any siblings that come after WINDOW. */
4338 tem = XWINDOW (window)->next;
4339 while (! NILP (tem))
4341 next = XWINDOW (tem)->next;
4342 delete_window (tem);
4343 tem = next;
4346 /* Delete any siblings that come after WINDOW.
4347 Note that if START is not WINDOW, then WINDOW still
4348 Fhas siblings, so WINDOW has not yet replaced its parent. */
4349 tem = start;
4350 while (! EQ (tem, window))
4352 next = XWINDOW (tem)->next;
4353 delete_window (tem);
4354 tem = next;
4357 else
4359 /* Otherwise, make delta1 just right so that if we add
4360 delta1 lines to this window and to the parent, and then
4361 shrink the parent back to its original size, the new
4362 proportional size of this window will increase by delta.
4364 The function size_window will compute the new height h'
4365 of the window from delta1 as:
4367 e = delta1/n
4368 x = delta1 - delta1/n * n for the 1st resizable child
4369 h' = h + e + x
4371 where n is the number of children that can be resized.
4372 We can ignore x by choosing a delta1 that is a multiple of
4373 n. We want the height of this window to come out as
4375 h' = h + delta
4377 So, delta1 must be
4379 h + e = h + delta
4380 delta1/n = delta
4381 delta1 = n * delta.
4383 The number of children n equals the number of resizable
4384 children of this window + 1 because we know window itself
4385 is resizable (otherwise we would have signalled an error). */
4387 struct window *w = XWINDOW (window);
4388 Lisp_Object s;
4389 int n = 1;
4391 for (s = w->next; !NILP (s); s = XWINDOW (s)->next)
4392 if (!window_fixed_size_p (XWINDOW (s), horiz_flag, 0))
4393 ++n;
4394 for (s = w->prev; !NILP (s); s = XWINDOW (s)->prev)
4395 if (!window_fixed_size_p (XWINDOW (s), horiz_flag, 0))
4396 ++n;
4398 delta1 = n * delta;
4400 /* Add delta1 lines or columns to this window, and to the parent,
4401 keeping things consistent while not affecting siblings. */
4402 XSETINT (CURSIZE (parent), opht + delta1);
4403 (*setsizefun) (window, XINT (*sizep) + delta1, 0);
4405 /* Squeeze out delta1 lines or columns from our parent,
4406 shriking this window and siblings proportionately.
4407 This brings parent back to correct size.
4408 Delta1 was calculated so this makes this window the desired size,
4409 taking it all out of the siblings. */
4410 (*setsizefun) (parent, opht, 0);
4415 XSETFASTINT (p->last_modified, 0);
4416 XSETFASTINT (p->last_overlay_modified, 0);
4418 /* Adjust glyph matrices. */
4419 adjust_glyphs (XFRAME (WINDOW_FRAME (XWINDOW (window))));
4423 /* Adjust the size of WINDOW by DELTA, moving only its trailing edge.
4424 HORIZ_FLAG nonzero means adjust the width, moving the right edge.
4425 zero means adjust the height, moving the bottom edge.
4427 Following siblings of the selected window are resized to fulfill
4428 the size request. If they become too small in the process, they
4429 are not deleted; instead, we signal an error. */
4431 static void
4432 adjust_window_trailing_edge (window, delta, horiz_flag)
4433 Lisp_Object window;
4434 int delta, horiz_flag;
4436 Lisp_Object parent, child;
4437 struct window *p;
4438 Lisp_Object old_config = Fcurrent_window_configuration (Qnil);
4439 int delcount = window_deletion_count;
4441 /* Check values of window_min_width and window_min_height for
4442 validity. */
4443 check_min_window_sizes ();
4445 if (NILP (window))
4446 window = Fselected_window ();
4448 CHECK_WINDOW (window);
4450 /* Give up if this window cannot be resized. */
4451 if (window_fixed_size_p (XWINDOW (window), horiz_flag, 1))
4452 error ("Window is not resizable");
4454 while (1)
4456 Lisp_Object first_parallel = Qnil;
4458 if (NILP (window))
4460 /* This happens if WINDOW on the previous iteration was
4461 at top level of the window tree. */
4462 Fset_window_configuration (old_config);
4463 error ("Specified window edge is fixed");
4466 p = XWINDOW (window);
4467 parent = p->parent;
4469 /* See if this level has windows in parallel in the specified
4470 direction. If so, set FIRST_PARALLEL to the first one. */
4471 if (horiz_flag)
4473 if (! NILP (parent) && !NILP (XWINDOW (parent)->vchild))
4474 first_parallel = XWINDOW (parent)->vchild;
4475 else if (NILP (parent) && !NILP (p->next))
4477 /* Handle the vertical chain of main window and minibuffer
4478 which has no parent. */
4479 first_parallel = window;
4480 while (! NILP (XWINDOW (first_parallel)->prev))
4481 first_parallel = XWINDOW (first_parallel)->prev;
4484 else
4486 if (! NILP (parent) && !NILP (XWINDOW (parent)->hchild))
4487 first_parallel = XWINDOW (parent)->hchild;
4490 /* If this level's succession is in the desired dimension,
4491 and this window is the last one, and there is no higher level,
4492 its trailing edge is fixed. */
4493 if (NILP (XWINDOW (window)->next) && NILP (first_parallel)
4494 && NILP (parent))
4496 Fset_window_configuration (old_config);
4497 error ("Specified window edge is fixed");
4500 /* Don't make this window too small. */
4501 if (XINT (CURSIZE (window)) + delta
4502 < (horiz_flag ? window_min_width : window_min_height))
4504 Fset_window_configuration (old_config);
4505 error ("Cannot adjust window size as specified");
4508 /* Clear out some redisplay caches. */
4509 XSETFASTINT (p->last_modified, 0);
4510 XSETFASTINT (p->last_overlay_modified, 0);
4512 /* Adjust this window's edge. */
4513 XSETINT (CURSIZE (window),
4514 XINT (CURSIZE (window)) + delta);
4516 /* If this window has following siblings in the desired dimension,
4517 make them smaller, and exit the loop.
4519 (If we reach the top of the tree and can never do this,
4520 we will fail and report an error, above.) */
4521 if (NILP (first_parallel))
4523 if (!NILP (p->next))
4525 /* This may happen for the minibuffer. In that case
4526 the window_deletion_count check below does not work. */
4527 if (XINT (CURSIZE (p->next)) - delta <= 0)
4529 Fset_window_configuration (old_config);
4530 error ("Cannot adjust window size as specified");
4533 XSETINT (CURBEG (p->next),
4534 XINT (CURBEG (p->next)) + delta);
4535 size_window (p->next, XINT (CURSIZE (p->next)) - delta,
4536 horiz_flag, 0, 1, 0);
4537 break;
4540 else
4541 /* Here we have a chain of parallel siblings, in the other dimension.
4542 Change the size of the other siblings. */
4543 for (child = first_parallel;
4544 ! NILP (child);
4545 child = XWINDOW (child)->next)
4546 if (! EQ (child, window))
4547 size_window (child, XINT (CURSIZE (child)) + delta,
4548 horiz_flag, 0, 0, 1);
4550 window = parent;
4553 /* If we made a window so small it got deleted,
4554 we failed. Report failure. */
4555 if (delcount != window_deletion_count)
4557 Fset_window_configuration (old_config);
4558 error ("Cannot adjust window size as specified");
4561 /* Adjust glyph matrices. */
4562 adjust_glyphs (XFRAME (WINDOW_FRAME (XWINDOW (window))));
4565 #undef CURBEG
4566 #undef CURSIZE
4568 DEFUN ("adjust-window-trailing-edge", Fadjust_window_trailing_edge,
4569 Sadjust_window_trailing_edge, 3, 3, 0,
4570 doc: /* Adjust the bottom or right edge of WINDOW by DELTA.
4571 If HORIZONTAL is non-nil, that means adjust the width, moving the right edge.
4572 Otherwise, adjust the height, moving the bottom edge.
4574 Following siblings of the selected window are resized to fulfill
4575 the size request. If they become too small in the process, they
4576 are not deleted; instead, we signal an error. */)
4577 (window, delta, horizontal)
4578 Lisp_Object window, delta, horizontal;
4580 CHECK_NUMBER (delta);
4581 adjust_window_trailing_edge (window, XINT (delta), !NILP (horizontal));
4583 if (! NILP (Vwindow_configuration_change_hook))
4584 call1 (Vrun_hooks, Qwindow_configuration_change_hook);
4586 return Qnil;
4591 /***********************************************************************
4592 Resizing Mini-Windows
4593 ***********************************************************************/
4595 static void shrink_window_lowest_first P_ ((struct window *, int));
4597 enum save_restore_action
4599 CHECK_ORIG_SIZES,
4600 SAVE_ORIG_SIZES,
4601 RESTORE_ORIG_SIZES
4604 static int save_restore_orig_size P_ ((struct window *,
4605 enum save_restore_action));
4607 /* Shrink windows rooted in window W to HEIGHT. Take the space needed
4608 from lowest windows first. */
4610 static void
4611 shrink_window_lowest_first (w, height)
4612 struct window *w;
4613 int height;
4615 struct window *c;
4616 Lisp_Object child;
4617 int old_height;
4619 xassert (!MINI_WINDOW_P (w));
4621 /* Set redisplay hints. */
4622 XSETFASTINT (w->last_modified, 0);
4623 XSETFASTINT (w->last_overlay_modified, 0);
4624 windows_or_buffers_changed++;
4625 FRAME_WINDOW_SIZES_CHANGED (XFRAME (WINDOW_FRAME (w))) = 1;
4627 old_height = XFASTINT (w->total_lines);
4628 XSETFASTINT (w->total_lines, height);
4630 if (!NILP (w->hchild))
4632 for (child = w->hchild; !NILP (child); child = c->next)
4634 c = XWINDOW (child);
4635 c->top_line = w->top_line;
4636 shrink_window_lowest_first (c, height);
4639 else if (!NILP (w->vchild))
4641 Lisp_Object last_child;
4642 int delta = old_height - height;
4643 int last_top;
4645 last_child = Qnil;
4647 /* Find the last child. We are taking space from lowest windows
4648 first, so we iterate over children from the last child
4649 backwards. */
4650 for (child = w->vchild; !NILP (child); child = XWINDOW (child)->next)
4651 last_child = child;
4653 /* Assign new heights. We leave only MIN_SAFE_WINDOW_HEIGHT. */
4654 for (child = last_child; delta && !NILP (child); child = c->prev)
4656 int this_one;
4658 c = XWINDOW (child);
4659 this_one = XFASTINT (c->total_lines) - MIN_SAFE_WINDOW_HEIGHT;
4661 if (this_one > delta)
4662 this_one = delta;
4664 shrink_window_lowest_first (c, XFASTINT (c->total_lines) - this_one);
4665 delta -= this_one;
4668 /* Compute new positions. */
4669 last_top = XINT (w->top_line);
4670 for (child = w->vchild; !NILP (child); child = c->next)
4672 c = XWINDOW (child);
4673 c->top_line = make_number (last_top);
4674 shrink_window_lowest_first (c, XFASTINT (c->total_lines));
4675 last_top += XFASTINT (c->total_lines);
4681 /* Save, restore, or check positions and sizes in the window tree
4682 rooted at W. ACTION says what to do.
4684 If ACTION is CHECK_ORIG_SIZES, check if orig_top_line and
4685 orig_total_lines members are valid for all windows in the window
4686 tree. Value is non-zero if they are valid.
4688 If ACTION is SAVE_ORIG_SIZES, save members top and height in
4689 orig_top_line and orig_total_lines for all windows in the tree.
4691 If ACTION is RESTORE_ORIG_SIZES, restore top and height from values
4692 stored in orig_top_line and orig_total_lines for all windows. */
4694 static int
4695 save_restore_orig_size (w, action)
4696 struct window *w;
4697 enum save_restore_action action;
4699 int success_p = 1;
4701 while (w)
4703 if (!NILP (w->hchild))
4705 if (!save_restore_orig_size (XWINDOW (w->hchild), action))
4706 success_p = 0;
4708 else if (!NILP (w->vchild))
4710 if (!save_restore_orig_size (XWINDOW (w->vchild), action))
4711 success_p = 0;
4714 switch (action)
4716 case CHECK_ORIG_SIZES:
4717 if (!INTEGERP (w->orig_top_line) || !INTEGERP (w->orig_total_lines))
4718 return 0;
4719 break;
4721 case SAVE_ORIG_SIZES:
4722 w->orig_top_line = w->top_line;
4723 w->orig_total_lines = w->total_lines;
4724 XSETFASTINT (w->last_modified, 0);
4725 XSETFASTINT (w->last_overlay_modified, 0);
4726 break;
4728 case RESTORE_ORIG_SIZES:
4729 xassert (INTEGERP (w->orig_top_line) && INTEGERP (w->orig_total_lines));
4730 w->top_line = w->orig_top_line;
4731 w->total_lines = w->orig_total_lines;
4732 w->orig_total_lines = w->orig_top_line = Qnil;
4733 XSETFASTINT (w->last_modified, 0);
4734 XSETFASTINT (w->last_overlay_modified, 0);
4735 break;
4737 default:
4738 abort ();
4741 w = NILP (w->next) ? NULL : XWINDOW (w->next);
4744 return success_p;
4748 /* Grow mini-window W by DELTA lines, DELTA >= 0, or as much as we can
4749 without deleting other windows. */
4751 void
4752 grow_mini_window (w, delta)
4753 struct window *w;
4754 int delta;
4756 struct frame *f = XFRAME (w->frame);
4757 struct window *root;
4759 xassert (MINI_WINDOW_P (w));
4760 xassert (delta >= 0);
4762 /* Check values of window_min_width and window_min_height for
4763 validity. */
4764 check_min_window_sizes ();
4766 /* Compute how much we can enlarge the mini-window without deleting
4767 other windows. */
4768 root = XWINDOW (FRAME_ROOT_WINDOW (f));
4769 if (delta)
4771 int min_height = window_min_size (root, 0, 0, 0);
4772 if (XFASTINT (root->total_lines) - delta < min_height)
4773 /* Note that the root window may already be smaller than
4774 min_height. */
4775 delta = max (0, XFASTINT (root->total_lines) - min_height);
4778 if (delta)
4780 /* Save original window sizes and positions, if not already done. */
4781 if (!save_restore_orig_size (root, CHECK_ORIG_SIZES))
4782 save_restore_orig_size (root, SAVE_ORIG_SIZES);
4784 /* Shrink other windows. */
4785 shrink_window_lowest_first (root, XFASTINT (root->total_lines) - delta);
4787 /* Grow the mini-window. */
4788 w->top_line = make_number (XFASTINT (root->top_line) + XFASTINT (root->total_lines));
4789 w->total_lines = make_number (XFASTINT (w->total_lines) + delta);
4790 XSETFASTINT (w->last_modified, 0);
4791 XSETFASTINT (w->last_overlay_modified, 0);
4793 adjust_glyphs (f);
4798 /* Shrink mini-window W. If there is recorded info about window sizes
4799 before a call to grow_mini_window, restore recorded window sizes.
4800 Otherwise, if the mini-window is higher than 1 line, resize it to 1
4801 line. */
4803 void
4804 shrink_mini_window (w)
4805 struct window *w;
4807 struct frame *f = XFRAME (w->frame);
4808 struct window *root = XWINDOW (FRAME_ROOT_WINDOW (f));
4810 if (save_restore_orig_size (root, CHECK_ORIG_SIZES))
4812 save_restore_orig_size (root, RESTORE_ORIG_SIZES);
4813 adjust_glyphs (f);
4814 FRAME_WINDOW_SIZES_CHANGED (f) = 1;
4815 windows_or_buffers_changed = 1;
4817 else if (XFASTINT (w->total_lines) > 1)
4819 /* Distribute the additional lines of the mini-window
4820 among the other windows. */
4821 Lisp_Object window;
4822 XSETWINDOW (window, w);
4823 enlarge_window (window, 1 - XFASTINT (w->total_lines), 0);
4829 /* Mark window cursors off for all windows in the window tree rooted
4830 at W by setting their phys_cursor_on_p flag to zero. Called from
4831 xterm.c, e.g. when a frame is cleared and thereby all cursors on
4832 the frame are cleared. */
4834 void
4835 mark_window_cursors_off (w)
4836 struct window *w;
4838 while (w)
4840 if (!NILP (w->hchild))
4841 mark_window_cursors_off (XWINDOW (w->hchild));
4842 else if (!NILP (w->vchild))
4843 mark_window_cursors_off (XWINDOW (w->vchild));
4844 else
4845 w->phys_cursor_on_p = 0;
4847 w = NILP (w->next) ? 0 : XWINDOW (w->next);
4852 /* Return number of lines of text (not counting mode lines) in W. */
4855 window_internal_height (w)
4856 struct window *w;
4858 int ht = XFASTINT (w->total_lines);
4860 if (!MINI_WINDOW_P (w))
4862 if (!NILP (w->parent)
4863 || !NILP (w->vchild)
4864 || !NILP (w->hchild)
4865 || !NILP (w->next)
4866 || !NILP (w->prev)
4867 || WINDOW_WANTS_MODELINE_P (w))
4868 --ht;
4870 if (WINDOW_WANTS_HEADER_LINE_P (w))
4871 --ht;
4874 return ht;
4878 /* Return the number of columns in W.
4879 Don't count columns occupied by scroll bars or the vertical bar
4880 separating W from the sibling to its right. */
4883 window_box_text_cols (w)
4884 struct window *w;
4886 struct frame *f = XFRAME (WINDOW_FRAME (w));
4887 int width = XINT (w->total_cols);
4889 if (WINDOW_HAS_VERTICAL_SCROLL_BAR (w))
4890 /* Scroll bars occupy a few columns. */
4891 width -= WINDOW_CONFIG_SCROLL_BAR_COLS (w);
4892 else if (!FRAME_WINDOW_P (f)
4893 && !WINDOW_RIGHTMOST_P (w) && !WINDOW_FULL_WIDTH_P (w))
4894 /* The column of `|' characters separating side-by-side windows
4895 occupies one column only. */
4896 width -= 1;
4898 if (FRAME_WINDOW_P (f))
4899 /* On window-systems, fringes and display margins cannot be
4900 used for normal text. */
4901 width -= (WINDOW_FRINGE_COLS (w)
4902 + WINDOW_LEFT_MARGIN_COLS (w)
4903 + WINDOW_RIGHT_MARGIN_COLS (w));
4905 return width;
4909 /************************************************************************
4910 Window Scrolling
4911 ***********************************************************************/
4913 /* Scroll contents of window WINDOW up. If WHOLE is non-zero, scroll
4914 N screen-fulls, which is defined as the height of the window minus
4915 next_screen_context_lines. If WHOLE is zero, scroll up N lines
4916 instead. Negative values of N mean scroll down. NOERROR non-zero
4917 means don't signal an error if we try to move over BEGV or ZV,
4918 respectively. */
4920 static void
4921 window_scroll (window, n, whole, noerror)
4922 Lisp_Object window;
4923 int n;
4924 int whole;
4925 int noerror;
4927 immediate_quit = 1;
4929 /* If we must, use the pixel-based version which is much slower than
4930 the line-based one but can handle varying line heights. */
4931 if (FRAME_WINDOW_P (XFRAME (XWINDOW (window)->frame)))
4932 window_scroll_pixel_based (window, n, whole, noerror);
4933 else
4934 window_scroll_line_based (window, n, whole, noerror);
4936 immediate_quit = 0;
4940 /* Implementation of window_scroll that works based on pixel line
4941 heights. See the comment of window_scroll for parameter
4942 descriptions. */
4944 static void
4945 window_scroll_pixel_based (window, n, whole, noerror)
4946 Lisp_Object window;
4947 int n;
4948 int whole;
4949 int noerror;
4951 struct it it;
4952 struct window *w = XWINDOW (window);
4953 struct text_pos start;
4954 int this_scroll_margin;
4955 /* True if we fiddled the window vscroll field without really scrolling. */
4956 int vscrolled = 0;
4957 int x, y, rtop, rbot, rowh, vpos;
4959 SET_TEXT_POS_FROM_MARKER (start, w->start);
4961 /* If PT is not visible in WINDOW, move back one half of
4962 the screen. Allow PT to be partially visible, otherwise
4963 something like (scroll-down 1) with PT in the line before
4964 the partially visible one would recenter. */
4966 if (!pos_visible_p (w, PT, &x, &y, &rtop, &rbot, &rowh, &vpos))
4968 /* Move backward half the height of the window. Performance note:
4969 vmotion used here is about 10% faster, but would give wrong
4970 results for variable height lines. */
4971 init_iterator (&it, w, PT, PT_BYTE, NULL, DEFAULT_FACE_ID);
4972 it.current_y = it.last_visible_y;
4973 move_it_vertically_backward (&it, window_box_height (w) / 2);
4975 /* The function move_iterator_vertically may move over more than
4976 the specified y-distance. If it->w is small, e.g. a
4977 mini-buffer window, we may end up in front of the window's
4978 display area. This is the case when Start displaying at the
4979 start of the line containing PT in this case. */
4980 if (it.current_y <= 0)
4982 init_iterator (&it, w, PT, PT_BYTE, NULL, DEFAULT_FACE_ID);
4983 move_it_vertically_backward (&it, 0);
4984 it.current_y = 0;
4987 start = it.current.pos;
4989 else if (auto_window_vscroll_p)
4991 if (rtop || rbot) /* partially visible */
4993 int px;
4994 int dy = WINDOW_FRAME_LINE_HEIGHT (w);
4995 if (whole)
4996 dy = max ((window_box_height (w)
4997 - next_screen_context_lines * dy),
4998 dy);
4999 dy *= n;
5001 if (n < 0)
5003 /* Only vscroll backwards if already vscrolled forwards. */
5004 if (w->vscroll < 0 && rtop > 0)
5006 px = max (0, -w->vscroll - min (rtop, -dy));
5007 Fset_window_vscroll (window, make_number (px), Qt);
5008 return;
5011 if (n > 0)
5013 /* Do vscroll if already vscrolled or only display line. */
5014 if (rbot > 0 && (w->vscroll < 0 || vpos == 0))
5016 px = max (0, -w->vscroll + min (rbot, dy));
5017 Fset_window_vscroll (window, make_number (px), Qt);
5018 return;
5021 /* Maybe modify window start instead of scrolling. */
5022 if (rbot > 0 || w->vscroll < 0)
5024 int spos;
5026 Fset_window_vscroll (window, make_number (0), Qt);
5027 /* If there are other text lines above the current row,
5028 move window start to current row. Else to next row. */
5029 if (rbot > 0)
5030 spos = XINT (Fline_beginning_position (Qnil));
5031 else
5032 spos = min (XINT (Fline_end_position (Qnil)) + 1, ZV);
5033 set_marker_restricted (w->start, make_number (spos),
5034 w->buffer);
5035 w->start_at_line_beg = Qt;
5036 w->update_mode_line = Qt;
5037 XSETFASTINT (w->last_modified, 0);
5038 XSETFASTINT (w->last_overlay_modified, 0);
5039 /* Set force_start so that redisplay_window will run the
5040 window-scroll-functions. */
5041 w->force_start = Qt;
5042 return;
5046 /* Cancel previous vscroll. */
5047 Fset_window_vscroll (window, make_number (0), Qt);
5050 /* If scroll_preserve_screen_position is non-nil, we try to set
5051 point in the same window line as it is now, so get that line. */
5052 if (!NILP (Vscroll_preserve_screen_position))
5054 /* We preserve the goal pixel coordinate across consecutive
5055 calls to scroll-up or scroll-down. This avoids the
5056 possibility of point becoming "stuck" on a tall line when
5057 scrolling by one line. */
5058 if (window_scroll_pixel_based_preserve_y < 0
5059 || (!EQ (current_kboard->Vlast_command, Qscroll_up)
5060 && !EQ (current_kboard->Vlast_command, Qscroll_down)))
5062 start_display (&it, w, start);
5063 move_it_to (&it, PT, -1, -1, -1, MOVE_TO_POS);
5064 window_scroll_pixel_based_preserve_y = it.current_y;
5067 else
5068 window_scroll_pixel_based_preserve_y = -1;
5070 /* Move iterator it from start the specified distance forward or
5071 backward. The result is the new window start. */
5072 start_display (&it, w, start);
5073 if (whole)
5075 int start_pos = IT_CHARPOS (it);
5076 int dy = WINDOW_FRAME_LINE_HEIGHT (w);
5077 dy = max ((window_box_height (w)
5078 - next_screen_context_lines * dy),
5079 dy) * n;
5081 /* Note that move_it_vertically always moves the iterator to the
5082 start of a line. So, if the last line doesn't have a newline,
5083 we would end up at the start of the line ending at ZV. */
5084 if (dy <= 0)
5086 move_it_vertically_backward (&it, -dy);
5087 /* Ensure we actually do move, e.g. in case we are currently
5088 looking at an image that is taller that the window height. */
5089 while (start_pos == IT_CHARPOS (it)
5090 && start_pos > BEGV)
5091 move_it_by_lines (&it, -1, 1);
5093 else if (dy > 0)
5095 move_it_to (&it, ZV, -1, it.current_y + dy, -1,
5096 MOVE_TO_POS | MOVE_TO_Y);
5097 /* Ensure we actually do move, e.g. in case we are currently
5098 looking at an image that is taller that the window height. */
5099 while (start_pos == IT_CHARPOS (it)
5100 && start_pos < ZV)
5101 move_it_by_lines (&it, 1, 1);
5104 else
5105 move_it_by_lines (&it, n, 1);
5107 /* We failed if we find ZV is already on the screen (scrolling up,
5108 means there's nothing past the end), or if we can't start any
5109 earlier (scrolling down, means there's nothing past the top). */
5110 if ((n > 0 && IT_CHARPOS (it) == ZV)
5111 || (n < 0 && IT_CHARPOS (it) == CHARPOS (start)))
5113 if (IT_CHARPOS (it) == ZV)
5115 if (it.current_y < it.last_visible_y
5116 && (it.current_y + it.max_ascent + it.max_descent
5117 > it.last_visible_y))
5119 /* The last line was only partially visible, make it fully
5120 visible. */
5121 w->vscroll = (it.last_visible_y
5122 - it.current_y + it.max_ascent + it.max_descent);
5123 adjust_glyphs (it.f);
5125 else if (noerror)
5126 return;
5127 else if (n < 0) /* could happen with empty buffers */
5128 xsignal0 (Qbeginning_of_buffer);
5129 else
5130 xsignal0 (Qend_of_buffer);
5132 else
5134 if (w->vscroll != 0)
5135 /* The first line was only partially visible, make it fully
5136 visible. */
5137 w->vscroll = 0;
5138 else if (noerror)
5139 return;
5140 else
5141 xsignal0 (Qbeginning_of_buffer);
5144 /* If control gets here, then we vscrolled. */
5146 XBUFFER (w->buffer)->prevent_redisplay_optimizations_p = 1;
5148 /* Don't try to change the window start below. */
5149 vscrolled = 1;
5152 if (! vscrolled)
5154 int pos = IT_CHARPOS (it);
5155 int bytepos;
5157 /* If in the middle of a multi-glyph character move forward to
5158 the next character. */
5159 if (in_display_vector_p (&it))
5161 ++pos;
5162 move_it_to (&it, pos, -1, -1, -1, MOVE_TO_POS);
5165 /* Set the window start, and set up the window for redisplay. */
5166 set_marker_restricted (w->start, make_number (pos),
5167 w->buffer);
5168 bytepos = XMARKER (w->start)->bytepos;
5169 w->start_at_line_beg = ((pos == BEGV || FETCH_BYTE (bytepos - 1) == '\n')
5170 ? Qt : Qnil);
5171 w->update_mode_line = Qt;
5172 XSETFASTINT (w->last_modified, 0);
5173 XSETFASTINT (w->last_overlay_modified, 0);
5174 /* Set force_start so that redisplay_window will run the
5175 window-scroll-functions. */
5176 w->force_start = Qt;
5179 /* The rest of this function uses current_y in a nonstandard way,
5180 not including the height of the header line if any. */
5181 it.current_y = it.vpos = 0;
5183 /* Move PT out of scroll margins.
5184 This code wants current_y to be zero at the window start position
5185 even if there is a header line. */
5186 this_scroll_margin = max (0, scroll_margin);
5187 this_scroll_margin = min (this_scroll_margin, XFASTINT (w->total_lines) / 4);
5188 this_scroll_margin *= FRAME_LINE_HEIGHT (it.f);
5190 if (n > 0)
5192 /* We moved the window start towards ZV, so PT may be now
5193 in the scroll margin at the top. */
5194 move_it_to (&it, PT, -1, -1, -1, MOVE_TO_POS);
5195 if (IT_CHARPOS (it) == PT && it.current_y >= this_scroll_margin
5196 && (NILP (Vscroll_preserve_screen_position)
5197 || EQ (Vscroll_preserve_screen_position, Qt)))
5198 /* We found PT at a legitimate height. Leave it alone. */
5200 else if (window_scroll_pixel_based_preserve_y >= 0)
5202 /* If we have a header line, take account of it.
5203 This is necessary because we set it.current_y to 0, above. */
5204 move_it_to (&it, -1, -1,
5205 window_scroll_pixel_based_preserve_y
5206 - (WINDOW_WANTS_HEADER_LINE_P (w) ? 1 : 0 ),
5207 -1, MOVE_TO_Y);
5208 SET_PT_BOTH (IT_CHARPOS (it), IT_BYTEPOS (it));
5210 else
5212 while (it.current_y < this_scroll_margin)
5214 int prev = it.current_y;
5215 move_it_by_lines (&it, 1, 1);
5216 if (prev == it.current_y)
5217 break;
5219 SET_PT_BOTH (IT_CHARPOS (it), IT_BYTEPOS (it));
5222 else if (n < 0)
5224 int charpos, bytepos;
5225 int partial_p;
5227 /* Save our position, for the
5228 window_scroll_pixel_based_preserve_y case. */
5229 charpos = IT_CHARPOS (it);
5230 bytepos = IT_BYTEPOS (it);
5232 /* We moved the window start towards BEGV, so PT may be now
5233 in the scroll margin at the bottom. */
5234 move_it_to (&it, PT, -1,
5235 (it.last_visible_y - CURRENT_HEADER_LINE_HEIGHT (w)
5236 - this_scroll_margin - 1),
5238 MOVE_TO_POS | MOVE_TO_Y);
5240 /* Save our position, in case it's correct. */
5241 charpos = IT_CHARPOS (it);
5242 bytepos = IT_BYTEPOS (it);
5244 /* See if point is on a partially visible line at the end. */
5245 if (it.what == IT_EOB)
5246 partial_p = it.current_y + it.ascent + it.descent > it.last_visible_y;
5247 else
5249 move_it_by_lines (&it, 1, 1);
5250 partial_p = it.current_y > it.last_visible_y;
5253 if (charpos == PT && !partial_p
5254 && (NILP (Vscroll_preserve_screen_position)
5255 || EQ (Vscroll_preserve_screen_position, Qt)))
5256 /* We found PT before we found the display margin, so PT is ok. */
5258 else if (window_scroll_pixel_based_preserve_y >= 0)
5260 SET_TEXT_POS_FROM_MARKER (start, w->start);
5261 start_display (&it, w, start);
5262 /* It would be wrong to subtract CURRENT_HEADER_LINE_HEIGHT
5263 here because we called start_display again and did not
5264 alter it.current_y this time. */
5265 move_it_to (&it, -1, -1, window_scroll_pixel_based_preserve_y, -1,
5266 MOVE_TO_Y);
5267 SET_PT_BOTH (IT_CHARPOS (it), IT_BYTEPOS (it));
5269 else
5271 if (partial_p)
5272 /* The last line was only partially visible, so back up two
5273 lines to make sure we're on a fully visible line. */
5275 move_it_by_lines (&it, -2, 0);
5276 SET_PT_BOTH (IT_CHARPOS (it), IT_BYTEPOS (it));
5278 else
5279 /* No, the position we saved is OK, so use it. */
5280 SET_PT_BOTH (charpos, bytepos);
5286 /* Implementation of window_scroll that works based on screen lines.
5287 See the comment of window_scroll for parameter descriptions. */
5289 static void
5290 window_scroll_line_based (window, n, whole, noerror)
5291 Lisp_Object window;
5292 int n;
5293 int whole;
5294 int noerror;
5296 register struct window *w = XWINDOW (window);
5297 register int opoint = PT, opoint_byte = PT_BYTE;
5298 register int pos, pos_byte;
5299 register int ht = window_internal_height (w);
5300 register Lisp_Object tem;
5301 int lose;
5302 Lisp_Object bolp;
5303 int startpos;
5304 struct position posit;
5305 int original_vpos;
5307 /* If scrolling screen-fulls, compute the number of lines to
5308 scroll from the window's height. */
5309 if (whole)
5310 n *= max (1, ht - next_screen_context_lines);
5312 startpos = marker_position (w->start);
5314 posit = *compute_motion (startpos, 0, 0, 0,
5315 PT, ht, 0,
5316 -1, XINT (w->hscroll),
5317 0, w);
5318 original_vpos = posit.vpos;
5320 XSETFASTINT (tem, PT);
5321 tem = Fpos_visible_in_window_p (tem, window, Qnil);
5323 if (NILP (tem))
5325 Fvertical_motion (make_number (- (ht / 2)), window);
5326 startpos = PT;
5329 SET_PT (startpos);
5330 lose = n < 0 && PT == BEGV;
5331 Fvertical_motion (make_number (n), window);
5332 pos = PT;
5333 pos_byte = PT_BYTE;
5334 bolp = Fbolp ();
5335 SET_PT_BOTH (opoint, opoint_byte);
5337 if (lose)
5339 if (noerror)
5340 return;
5341 else
5342 xsignal0 (Qbeginning_of_buffer);
5345 if (pos < ZV)
5347 int this_scroll_margin = scroll_margin;
5349 /* Don't use a scroll margin that is negative or too large. */
5350 if (this_scroll_margin < 0)
5351 this_scroll_margin = 0;
5353 if (XINT (w->total_lines) < 4 * scroll_margin)
5354 this_scroll_margin = XINT (w->total_lines) / 4;
5356 set_marker_restricted_both (w->start, w->buffer, pos, pos_byte);
5357 w->start_at_line_beg = bolp;
5358 w->update_mode_line = Qt;
5359 XSETFASTINT (w->last_modified, 0);
5360 XSETFASTINT (w->last_overlay_modified, 0);
5361 /* Set force_start so that redisplay_window will run
5362 the window-scroll-functions. */
5363 w->force_start = Qt;
5365 if (!NILP (Vscroll_preserve_screen_position)
5366 && (whole || !EQ (Vscroll_preserve_screen_position, Qt)))
5368 SET_PT_BOTH (pos, pos_byte);
5369 Fvertical_motion (make_number (original_vpos), window);
5371 /* If we scrolled forward, put point enough lines down
5372 that it is outside the scroll margin. */
5373 else if (n > 0)
5375 int top_margin;
5377 if (this_scroll_margin > 0)
5379 SET_PT_BOTH (pos, pos_byte);
5380 Fvertical_motion (make_number (this_scroll_margin), window);
5381 top_margin = PT;
5383 else
5384 top_margin = pos;
5386 if (top_margin <= opoint)
5387 SET_PT_BOTH (opoint, opoint_byte);
5388 else if (!NILP (Vscroll_preserve_screen_position))
5390 SET_PT_BOTH (pos, pos_byte);
5391 Fvertical_motion (make_number (original_vpos), window);
5393 else
5394 SET_PT (top_margin);
5396 else if (n < 0)
5398 int bottom_margin;
5400 /* If we scrolled backward, put point near the end of the window
5401 but not within the scroll margin. */
5402 SET_PT_BOTH (pos, pos_byte);
5403 tem = Fvertical_motion (make_number (ht - this_scroll_margin), window);
5404 if (XFASTINT (tem) == ht - this_scroll_margin)
5405 bottom_margin = PT;
5406 else
5407 bottom_margin = PT + 1;
5409 if (bottom_margin > opoint)
5410 SET_PT_BOTH (opoint, opoint_byte);
5411 else
5413 if (!NILP (Vscroll_preserve_screen_position))
5415 SET_PT_BOTH (pos, pos_byte);
5416 Fvertical_motion (make_number (original_vpos), window);
5418 else
5419 Fvertical_motion (make_number (-1), window);
5423 else
5425 if (noerror)
5426 return;
5427 else
5428 xsignal0 (Qend_of_buffer);
5433 /* Scroll selected_window up or down. If N is nil, scroll a
5434 screen-full which is defined as the height of the window minus
5435 next_screen_context_lines. If N is the symbol `-', scroll.
5436 DIRECTION may be 1 meaning to scroll down, or -1 meaning to scroll
5437 up. This is the guts of Fscroll_up and Fscroll_down. */
5439 static void
5440 scroll_command (n, direction)
5441 Lisp_Object n;
5442 int direction;
5444 int count = SPECPDL_INDEX ();
5446 xassert (abs (direction) == 1);
5448 /* If selected window's buffer isn't current, make it current for
5449 the moment. But don't screw up if window_scroll gets an error. */
5450 if (XBUFFER (XWINDOW (selected_window)->buffer) != current_buffer)
5452 record_unwind_protect (save_excursion_restore, save_excursion_save ());
5453 Fset_buffer (XWINDOW (selected_window)->buffer);
5455 /* Make redisplay consider other windows than just selected_window. */
5456 ++windows_or_buffers_changed;
5459 if (NILP (n))
5460 window_scroll (selected_window, direction, 1, 0);
5461 else if (EQ (n, Qminus))
5462 window_scroll (selected_window, -direction, 1, 0);
5463 else
5465 n = Fprefix_numeric_value (n);
5466 window_scroll (selected_window, XINT (n) * direction, 0, 0);
5469 unbind_to (count, Qnil);
5472 DEFUN ("scroll-up", Fscroll_up, Sscroll_up, 0, 1, "P",
5473 doc: /* Scroll text of current window upward ARG lines.
5474 If ARG is omitted or nil, scroll upward by a near full screen.
5475 A near full screen is `next-screen-context-lines' less than a full screen.
5476 Negative ARG means scroll downward.
5477 If ARG is the atom `-', scroll downward by nearly full screen.
5478 When calling from a program, supply as argument a number, nil, or `-'. */)
5479 (arg)
5480 Lisp_Object arg;
5482 scroll_command (arg, 1);
5483 return Qnil;
5486 DEFUN ("scroll-down", Fscroll_down, Sscroll_down, 0, 1, "P",
5487 doc: /* Scroll text of current window down ARG lines.
5488 If ARG is omitted or nil, scroll down by a near full screen.
5489 A near full screen is `next-screen-context-lines' less than a full screen.
5490 Negative ARG means scroll upward.
5491 If ARG is the atom `-', scroll upward by nearly full screen.
5492 When calling from a program, supply as argument a number, nil, or `-'. */)
5493 (arg)
5494 Lisp_Object arg;
5496 scroll_command (arg, -1);
5497 return Qnil;
5500 DEFUN ("other-window-for-scrolling", Fother_window_for_scrolling, Sother_window_for_scrolling, 0, 0, 0,
5501 doc: /* Return the other window for \"other window scroll\" commands.
5502 If `other-window-scroll-buffer' is non-nil, a window
5503 showing that buffer is used.
5504 If in the minibuffer, `minibuffer-scroll-window' if non-nil
5505 specifies the window. This takes precedence over
5506 `other-window-scroll-buffer'. */)
5509 Lisp_Object window;
5511 if (MINI_WINDOW_P (XWINDOW (selected_window))
5512 && !NILP (Vminibuf_scroll_window))
5513 window = Vminibuf_scroll_window;
5514 /* If buffer is specified, scroll that buffer. */
5515 else if (!NILP (Vother_window_scroll_buffer))
5517 window = Fget_buffer_window (Vother_window_scroll_buffer, Qnil);
5518 if (NILP (window))
5519 window = Fdisplay_buffer (Vother_window_scroll_buffer, Qt, Qnil);
5521 else
5523 /* Nothing specified; look for a neighboring window on the same
5524 frame. */
5525 window = Fnext_window (selected_window, Qnil, Qnil);
5527 if (EQ (window, selected_window))
5528 /* That didn't get us anywhere; look for a window on another
5529 visible frame. */
5531 window = Fnext_window (window, Qnil, Qt);
5532 while (! FRAME_VISIBLE_P (XFRAME (WINDOW_FRAME (XWINDOW (window))))
5533 && ! EQ (window, selected_window));
5536 CHECK_LIVE_WINDOW (window);
5538 if (EQ (window, selected_window))
5539 error ("There is no other window");
5541 return window;
5544 DEFUN ("scroll-other-window", Fscroll_other_window, Sscroll_other_window, 0, 1, "P",
5545 doc: /* Scroll next window upward ARG lines; or near full screen if no ARG.
5546 A near full screen is `next-screen-context-lines' less than a full screen.
5547 The next window is the one below the current one; or the one at the top
5548 if the current one is at the bottom. Negative ARG means scroll downward.
5549 If ARG is the atom `-', scroll downward by nearly full screen.
5550 When calling from a program, supply as argument a number, nil, or `-'.
5552 If `other-window-scroll-buffer' is non-nil, scroll the window
5553 showing that buffer, popping the buffer up if necessary.
5554 If in the minibuffer, `minibuffer-scroll-window' if non-nil
5555 specifies the window to scroll. This takes precedence over
5556 `other-window-scroll-buffer'. */)
5557 (arg)
5558 Lisp_Object arg;
5560 Lisp_Object window;
5561 struct window *w;
5562 int count = SPECPDL_INDEX ();
5564 window = Fother_window_for_scrolling ();
5565 w = XWINDOW (window);
5567 /* Don't screw up if window_scroll gets an error. */
5568 record_unwind_protect (save_excursion_restore, save_excursion_save ());
5569 ++windows_or_buffers_changed;
5571 Fset_buffer (w->buffer);
5572 SET_PT (marker_position (w->pointm));
5574 if (NILP (arg))
5575 window_scroll (window, 1, 1, 1);
5576 else if (EQ (arg, Qminus))
5577 window_scroll (window, -1, 1, 1);
5578 else
5580 if (CONSP (arg))
5581 arg = Fcar (arg);
5582 CHECK_NUMBER (arg);
5583 window_scroll (window, XINT (arg), 0, 1);
5586 set_marker_both (w->pointm, Qnil, PT, PT_BYTE);
5587 unbind_to (count, Qnil);
5589 return Qnil;
5592 DEFUN ("scroll-left", Fscroll_left, Sscroll_left, 0, 2, "P\np",
5593 doc: /* Scroll selected window display ARG columns left.
5594 Default for ARG is window width minus 2.
5595 Value is the total amount of leftward horizontal scrolling in
5596 effect after the change.
5597 If SET_MINIMUM is non-nil, the new scroll amount becomes the
5598 lower bound for automatic scrolling, i.e. automatic scrolling
5599 will not scroll a window to a column less than the value returned
5600 by this function. This happens in an interactive call. */)
5601 (arg, set_minimum)
5602 register Lisp_Object arg, set_minimum;
5604 Lisp_Object result;
5605 int hscroll;
5606 struct window *w = XWINDOW (selected_window);
5608 if (NILP (arg))
5609 XSETFASTINT (arg, window_box_text_cols (w) - 2);
5610 else
5611 arg = Fprefix_numeric_value (arg);
5613 hscroll = XINT (w->hscroll) + XINT (arg);
5614 result = Fset_window_hscroll (selected_window, make_number (hscroll));
5616 if (!NILP (set_minimum))
5617 w->min_hscroll = w->hscroll;
5619 return result;
5622 DEFUN ("scroll-right", Fscroll_right, Sscroll_right, 0, 2, "P\np",
5623 doc: /* Scroll selected window display ARG columns right.
5624 Default for ARG is window width minus 2.
5625 Value is the total amount of leftward horizontal scrolling in
5626 effect after the change.
5627 If SET_MINIMUM is non-nil, the new scroll amount becomes the
5628 lower bound for automatic scrolling, i.e. automatic scrolling
5629 will not scroll a window to a column less than the value returned
5630 by this function. This happens in an interactive call. */)
5631 (arg, set_minimum)
5632 register Lisp_Object arg, set_minimum;
5634 Lisp_Object result;
5635 int hscroll;
5636 struct window *w = XWINDOW (selected_window);
5638 if (NILP (arg))
5639 XSETFASTINT (arg, window_box_text_cols (w) - 2);
5640 else
5641 arg = Fprefix_numeric_value (arg);
5643 hscroll = XINT (w->hscroll) - XINT (arg);
5644 result = Fset_window_hscroll (selected_window, make_number (hscroll));
5646 if (!NILP (set_minimum))
5647 w->min_hscroll = w->hscroll;
5649 return result;
5652 DEFUN ("minibuffer-selected-window", Fminibuffer_selected_window, Sminibuffer_selected_window, 0, 0, 0,
5653 doc: /* Return the window which was selected when entering the minibuffer.
5654 Returns nil, if current window is not a minibuffer window. */)
5657 if (minibuf_level > 0
5658 && MINI_WINDOW_P (XWINDOW (selected_window))
5659 && WINDOW_LIVE_P (minibuf_selected_window))
5660 return minibuf_selected_window;
5662 return Qnil;
5665 /* Value is the number of lines actually displayed in window W,
5666 as opposed to its height. */
5668 static int
5669 displayed_window_lines (w)
5670 struct window *w;
5672 struct it it;
5673 struct text_pos start;
5674 int height = window_box_height (w);
5675 struct buffer *old_buffer;
5676 int bottom_y;
5678 if (XBUFFER (w->buffer) != current_buffer)
5680 old_buffer = current_buffer;
5681 set_buffer_internal (XBUFFER (w->buffer));
5683 else
5684 old_buffer = NULL;
5686 /* In case W->start is out of the accessible range, do something
5687 reasonable. This happens in Info mode when Info-scroll-down
5688 calls (recenter -1) while W->start is 1. */
5689 if (XMARKER (w->start)->charpos < BEGV)
5690 SET_TEXT_POS (start, BEGV, BEGV_BYTE);
5691 else if (XMARKER (w->start)->charpos > ZV)
5692 SET_TEXT_POS (start, ZV, ZV_BYTE);
5693 else
5694 SET_TEXT_POS_FROM_MARKER (start, w->start);
5696 start_display (&it, w, start);
5697 move_it_vertically (&it, height);
5698 bottom_y = line_bottom_y (&it);
5700 /* rms: On a non-window display,
5701 the value of it.vpos at the bottom of the screen
5702 seems to be 1 larger than window_box_height (w).
5703 This kludge fixes a bug whereby (move-to-window-line -1)
5704 when ZV is on the last screen line
5705 moves to the previous screen line instead of the last one. */
5706 if (! FRAME_WINDOW_P (XFRAME (w->frame)))
5707 height++;
5709 /* Add in empty lines at the bottom of the window. */
5710 if (bottom_y < height)
5712 int uy = FRAME_LINE_HEIGHT (it.f);
5713 it.vpos += (height - bottom_y + uy - 1) / uy;
5716 if (old_buffer)
5717 set_buffer_internal (old_buffer);
5719 return it.vpos;
5723 DEFUN ("recenter", Frecenter, Srecenter, 0, 1, "P",
5724 doc: /* Center point in window and redisplay frame.
5725 With prefix argument ARG, recenter putting point on screen line ARG
5726 relative to the current window. If ARG is negative, it counts up from the
5727 bottom of the window. (ARG should be less than the height of the window.)
5729 If ARG is omitted or nil, erase the entire frame and then redraw with point
5730 in the center of the current window. If `auto-resize-tool-bars' is set to
5731 `grow-only', this resets the tool-bar's height to the minimum height needed.
5733 Just C-u as prefix means put point in the center of the window
5734 and redisplay normally--don't erase and redraw the frame. */)
5735 (arg)
5736 register Lisp_Object arg;
5738 struct window *w = XWINDOW (selected_window);
5739 struct buffer *buf = XBUFFER (w->buffer);
5740 struct buffer *obuf = current_buffer;
5741 int center_p = 0;
5742 int charpos, bytepos;
5743 int iarg;
5744 int this_scroll_margin;
5746 /* If redisplay is suppressed due to an error, try again. */
5747 obuf->display_error_modiff = 0;
5749 if (NILP (arg))
5751 int i;
5753 /* Invalidate pixel data calculated for all compositions. */
5754 for (i = 0; i < n_compositions; i++)
5755 composition_table[i]->font = NULL;
5757 WINDOW_XFRAME (w)->minimize_tool_bar_window_p = 1;
5759 Fredraw_frame (WINDOW_FRAME (w));
5760 SET_FRAME_GARBAGED (WINDOW_XFRAME (w));
5761 center_p = 1;
5763 else if (CONSP (arg)) /* Just C-u. */
5764 center_p = 1;
5765 else
5767 arg = Fprefix_numeric_value (arg);
5768 CHECK_NUMBER (arg);
5769 iarg = XINT (arg);
5772 set_buffer_internal (buf);
5774 /* Do this after making BUF current
5775 in case scroll_margin is buffer-local. */
5776 this_scroll_margin = max (0, scroll_margin);
5777 this_scroll_margin = min (this_scroll_margin,
5778 XFASTINT (w->total_lines) / 4);
5780 /* Handle centering on a graphical frame specially. Such frames can
5781 have variable-height lines and centering point on the basis of
5782 line counts would lead to strange effects. */
5783 if (FRAME_WINDOW_P (XFRAME (w->frame)))
5785 if (center_p)
5787 struct it it;
5788 struct text_pos pt;
5790 SET_TEXT_POS (pt, PT, PT_BYTE);
5791 start_display (&it, w, pt);
5792 move_it_vertically_backward (&it, window_box_height (w) / 2);
5793 charpos = IT_CHARPOS (it);
5794 bytepos = IT_BYTEPOS (it);
5796 else if (iarg < 0)
5798 struct it it;
5799 struct text_pos pt;
5800 int nlines = -iarg;
5801 int extra_line_spacing;
5802 int h = window_box_height (w);
5804 iarg = - max (-iarg, this_scroll_margin);
5806 SET_TEXT_POS (pt, PT, PT_BYTE);
5807 start_display (&it, w, pt);
5809 /* Be sure we have the exact height of the full line containing PT. */
5810 move_it_by_lines (&it, 0, 1);
5812 /* The amount of pixels we have to move back is the window
5813 height minus what's displayed in the line containing PT,
5814 and the lines below. */
5815 it.current_y = 0;
5816 it.vpos = 0;
5817 move_it_by_lines (&it, nlines, 1);
5819 if (it.vpos == nlines)
5820 h -= it.current_y;
5821 else
5823 /* Last line has no newline */
5824 h -= line_bottom_y (&it);
5825 it.vpos++;
5828 /* Don't reserve space for extra line spacing of last line. */
5829 extra_line_spacing = it.max_extra_line_spacing;
5831 /* If we can't move down NLINES lines because we hit
5832 the end of the buffer, count in some empty lines. */
5833 if (it.vpos < nlines)
5835 nlines -= it.vpos;
5836 extra_line_spacing = it.extra_line_spacing;
5837 h -= nlines * (FRAME_LINE_HEIGHT (it.f) + extra_line_spacing);
5839 if (h <= 0)
5840 return Qnil;
5842 /* Now find the new top line (starting position) of the window. */
5843 start_display (&it, w, pt);
5844 it.current_y = 0;
5845 move_it_vertically_backward (&it, h);
5847 /* If extra line spacing is present, we may move too far
5848 back. This causes the last line to be only partially
5849 visible (which triggers redisplay to recenter that line
5850 in the middle), so move forward.
5851 But ignore extra line spacing on last line, as it is not
5852 considered to be part of the visible height of the line.
5854 h += extra_line_spacing;
5855 while (-it.current_y > h)
5856 move_it_by_lines (&it, 1, 1);
5858 charpos = IT_CHARPOS (it);
5859 bytepos = IT_BYTEPOS (it);
5861 else
5863 struct position pos;
5865 iarg = max (iarg, this_scroll_margin);
5867 pos = *vmotion (PT, -iarg, w);
5868 charpos = pos.bufpos;
5869 bytepos = pos.bytepos;
5872 else
5874 struct position pos;
5875 int ht = window_internal_height (w);
5877 if (center_p)
5878 iarg = ht / 2;
5879 else if (iarg < 0)
5880 iarg += ht;
5882 /* Don't let it get into the margin at either top or bottom. */
5883 iarg = max (iarg, this_scroll_margin);
5884 iarg = min (iarg, ht - this_scroll_margin - 1);
5886 pos = *vmotion (PT, - iarg, w);
5887 charpos = pos.bufpos;
5888 bytepos = pos.bytepos;
5891 /* Set the new window start. */
5892 set_marker_both (w->start, w->buffer, charpos, bytepos);
5893 w->window_end_valid = Qnil;
5895 w->optional_new_start = Qt;
5897 if (bytepos == BEGV_BYTE || FETCH_BYTE (bytepos - 1) == '\n')
5898 w->start_at_line_beg = Qt;
5899 else
5900 w->start_at_line_beg = Qnil;
5902 set_buffer_internal (obuf);
5903 return Qnil;
5907 DEFUN ("window-text-height", Fwindow_text_height, Swindow_text_height,
5908 0, 1, 0,
5909 doc: /* Return the height in lines of the text display area of WINDOW.
5910 WINDOW defaults to the selected window.
5911 This doesn't include the mode-line (or header-line if any) or any
5912 partial-height lines in the text display area. */)
5913 (window)
5914 Lisp_Object window;
5916 struct window *w = decode_window (window);
5917 int pixel_height = window_box_height (w);
5918 int line_height = pixel_height / FRAME_LINE_HEIGHT (XFRAME (w->frame));
5919 return make_number (line_height);
5924 DEFUN ("move-to-window-line", Fmove_to_window_line, Smove_to_window_line,
5925 1, 1, "P",
5926 doc: /* Position point relative to window.
5927 With no argument, position point at center of window.
5928 An argument specifies vertical position within the window;
5929 zero means top of window, negative means relative to bottom of window. */)
5930 (arg)
5931 Lisp_Object arg;
5933 struct window *w = XWINDOW (selected_window);
5934 int lines, start;
5935 Lisp_Object window;
5936 #if 0
5937 int this_scroll_margin;
5938 #endif
5940 window = selected_window;
5941 start = marker_position (w->start);
5942 if (start < BEGV || start > ZV)
5944 int height = window_internal_height (w);
5945 Fvertical_motion (make_number (- (height / 2)), window);
5946 set_marker_both (w->start, w->buffer, PT, PT_BYTE);
5947 w->start_at_line_beg = Fbolp ();
5948 w->force_start = Qt;
5950 else
5951 Fgoto_char (w->start);
5953 lines = displayed_window_lines (w);
5955 #if 0
5956 this_scroll_margin = max (0, scroll_margin);
5957 this_scroll_margin = min (this_scroll_margin, lines / 4);
5958 #endif
5960 if (NILP (arg))
5961 XSETFASTINT (arg, lines / 2);
5962 else
5964 int iarg = XINT (Fprefix_numeric_value (arg));
5966 if (iarg < 0)
5967 iarg = iarg + lines;
5969 #if 0 /* This code would prevent move-to-window-line from moving point
5970 to a place inside the scroll margins (which would cause the
5971 next redisplay to scroll). I wrote this code, but then concluded
5972 it is probably better not to install it. However, it is here
5973 inside #if 0 so as not to lose it. -- rms. */
5975 /* Don't let it get into the margin at either top or bottom. */
5976 iarg = max (iarg, this_scroll_margin);
5977 iarg = min (iarg, lines - this_scroll_margin - 1);
5978 #endif
5980 arg = make_number (iarg);
5983 /* Skip past a partially visible first line. */
5984 if (w->vscroll)
5985 XSETINT (arg, XINT (arg) + 1);
5987 return Fvertical_motion (arg, window);
5992 /***********************************************************************
5993 Window Configuration
5994 ***********************************************************************/
5996 struct save_window_data
5998 EMACS_INT size_from_Lisp_Vector_struct;
5999 struct Lisp_Vector *next_from_Lisp_Vector_struct;
6000 Lisp_Object frame_cols, frame_lines, frame_menu_bar_lines;
6001 Lisp_Object frame_tool_bar_lines;
6002 Lisp_Object selected_frame;
6003 Lisp_Object current_window;
6004 Lisp_Object current_buffer;
6005 Lisp_Object minibuf_scroll_window;
6006 Lisp_Object minibuf_selected_window;
6007 Lisp_Object root_window;
6008 Lisp_Object focus_frame;
6009 /* Record the values of window-min-width and window-min-height
6010 so that window sizes remain consistent with them. */
6011 Lisp_Object min_width, min_height;
6012 /* A vector, each of whose elements is a struct saved_window
6013 for one window. */
6014 Lisp_Object saved_windows;
6017 /* This is saved as a Lisp_Vector */
6018 struct saved_window
6020 /* these first two must agree with struct Lisp_Vector in lisp.h */
6021 EMACS_INT size_from_Lisp_Vector_struct;
6022 struct Lisp_Vector *next_from_Lisp_Vector_struct;
6024 Lisp_Object window;
6025 Lisp_Object buffer, start, pointm, mark;
6026 Lisp_Object left_col, top_line, total_cols, total_lines;
6027 Lisp_Object hscroll, min_hscroll;
6028 Lisp_Object parent, prev;
6029 Lisp_Object start_at_line_beg;
6030 Lisp_Object display_table;
6031 Lisp_Object orig_top_line, orig_total_lines;
6032 Lisp_Object left_margin_cols, right_margin_cols;
6033 Lisp_Object left_fringe_width, right_fringe_width, fringes_outside_margins;
6034 Lisp_Object scroll_bar_width, vertical_scroll_bar_type;
6035 Lisp_Object dedicated;
6038 #define SAVED_WINDOW_N(swv,n) \
6039 ((struct saved_window *) (XVECTOR ((swv)->contents[(n)])))
6041 DEFUN ("window-configuration-p", Fwindow_configuration_p, Swindow_configuration_p, 1, 1, 0,
6042 doc: /* Return t if OBJECT is a window-configuration object. */)
6043 (object)
6044 Lisp_Object object;
6046 return WINDOW_CONFIGURATIONP (object) ? Qt : Qnil;
6049 DEFUN ("window-configuration-frame", Fwindow_configuration_frame, Swindow_configuration_frame, 1, 1, 0,
6050 doc: /* Return the frame that CONFIG, a window-configuration object, is about. */)
6051 (config)
6052 Lisp_Object config;
6054 register struct save_window_data *data;
6055 struct Lisp_Vector *saved_windows;
6057 CHECK_WINDOW_CONFIGURATION (config);
6059 data = (struct save_window_data *) XVECTOR (config);
6060 saved_windows = XVECTOR (data->saved_windows);
6061 return XWINDOW (SAVED_WINDOW_N (saved_windows, 0)->window)->frame;
6064 DEFUN ("set-window-configuration", Fset_window_configuration,
6065 Sset_window_configuration, 1, 1, 0,
6066 doc: /* Set the configuration of windows and buffers as specified by CONFIGURATION.
6067 CONFIGURATION must be a value previously returned
6068 by `current-window-configuration' (which see).
6069 If CONFIGURATION was made from a frame that is now deleted,
6070 only frame-independent values can be restored. In this case,
6071 the return value is nil. Otherwise the value is t. */)
6072 (configuration)
6073 Lisp_Object configuration;
6075 register struct save_window_data *data;
6076 struct Lisp_Vector *saved_windows;
6077 Lisp_Object new_current_buffer;
6078 Lisp_Object frame;
6079 FRAME_PTR f;
6080 int old_point = -1;
6082 CHECK_WINDOW_CONFIGURATION (configuration);
6084 data = (struct save_window_data *) XVECTOR (configuration);
6085 saved_windows = XVECTOR (data->saved_windows);
6087 new_current_buffer = data->current_buffer;
6088 if (NILP (XBUFFER (new_current_buffer)->name))
6089 new_current_buffer = Qnil;
6090 else
6092 if (XBUFFER (new_current_buffer) == current_buffer)
6093 /* The code further down "preserves point" by saving here PT in
6094 old_point and then setting it later back into PT. When the
6095 current-selected-window and the final-selected-window both show
6096 the current buffer, this suffers from the problem that the
6097 current PT is the window-point of the current-selected-window,
6098 while the final PT is the point of the final-selected-window, so
6099 this copy from one PT to the other would end up moving the
6100 window-point of the final-selected-window to the window-point of
6101 the current-selected-window. So we have to be careful which
6102 point of the current-buffer we copy into old_point. */
6103 if (EQ (XWINDOW (data->current_window)->buffer, new_current_buffer)
6104 && WINDOWP (selected_window)
6105 && EQ (XWINDOW (selected_window)->buffer, new_current_buffer)
6106 && !EQ (selected_window, data->current_window))
6107 old_point = XMARKER (XWINDOW (data->current_window)->pointm)->charpos;
6108 else
6109 old_point = PT;
6110 else
6111 /* BUF_PT (XBUFFER (new_current_buffer)) gives us the position of
6112 point in new_current_buffer as of the last time this buffer was
6113 used. This can be non-deterministic since it can be changed by
6114 things like jit-lock by mere temporary selection of some random
6115 window that happens to show this buffer.
6116 So if possible we want this arbitrary choice of "which point" to
6117 be the one from the to-be-selected-window so as to prevent this
6118 window's cursor from being copied from another window. */
6119 if (EQ (XWINDOW (data->current_window)->buffer, new_current_buffer)
6120 /* If current_window = selected_window, its point is in BUF_PT. */
6121 && !EQ (selected_window, data->current_window))
6122 old_point = XMARKER (XWINDOW (data->current_window)->pointm)->charpos;
6123 else
6124 old_point = BUF_PT (XBUFFER (new_current_buffer));
6127 frame = XWINDOW (SAVED_WINDOW_N (saved_windows, 0)->window)->frame;
6128 f = XFRAME (frame);
6130 /* If f is a dead frame, don't bother rebuilding its window tree.
6131 However, there is other stuff we should still try to do below. */
6132 if (FRAME_LIVE_P (f))
6134 register struct window *w;
6135 register struct saved_window *p;
6136 struct window *root_window;
6137 struct window **leaf_windows;
6138 int n_leaf_windows;
6139 int k, i, n;
6141 /* If the frame has been resized since this window configuration was
6142 made, we change the frame to the size specified in the
6143 configuration, restore the configuration, and then resize it
6144 back. We keep track of the prevailing height in these variables. */
6145 int previous_frame_lines = FRAME_LINES (f);
6146 int previous_frame_cols = FRAME_COLS (f);
6147 int previous_frame_menu_bar_lines = FRAME_MENU_BAR_LINES (f);
6148 int previous_frame_tool_bar_lines = FRAME_TOOL_BAR_LINES (f);
6150 /* The mouse highlighting code could get screwed up
6151 if it runs during this. */
6152 BLOCK_INPUT;
6154 if (XFASTINT (data->frame_lines) != previous_frame_lines
6155 || XFASTINT (data->frame_cols) != previous_frame_cols)
6156 change_frame_size (f, XFASTINT (data->frame_lines),
6157 XFASTINT (data->frame_cols), 0, 0, 0);
6158 #if defined (HAVE_WINDOW_SYSTEM) || defined (MSDOS)
6159 if (XFASTINT (data->frame_menu_bar_lines)
6160 != previous_frame_menu_bar_lines)
6161 x_set_menu_bar_lines (f, data->frame_menu_bar_lines, make_number (0));
6162 #ifdef HAVE_WINDOW_SYSTEM
6163 if (XFASTINT (data->frame_tool_bar_lines)
6164 != previous_frame_tool_bar_lines)
6165 x_set_tool_bar_lines (f, data->frame_tool_bar_lines, make_number (0));
6166 #endif
6167 #endif
6169 /* "Swap out" point from the selected window's buffer
6170 into the window itself. (Normally the pointm of the selected
6171 window holds garbage.) We do this now, before
6172 restoring the window contents, and prevent it from
6173 being done later on when we select a new window. */
6174 if (! NILP (XWINDOW (selected_window)->buffer))
6176 w = XWINDOW (selected_window);
6177 set_marker_both (w->pointm,
6178 w->buffer,
6179 BUF_PT (XBUFFER (w->buffer)),
6180 BUF_PT_BYTE (XBUFFER (w->buffer)));
6183 windows_or_buffers_changed++;
6184 FRAME_WINDOW_SIZES_CHANGED (f) = 1;
6186 /* Problem: Freeing all matrices and later allocating them again
6187 is a serious redisplay flickering problem. What we would
6188 really like to do is to free only those matrices not reused
6189 below. */
6190 root_window = XWINDOW (FRAME_ROOT_WINDOW (f));
6191 leaf_windows
6192 = (struct window **) alloca (count_windows (root_window)
6193 * sizeof (struct window *));
6194 n_leaf_windows = get_leaf_windows (root_window, leaf_windows, 0);
6196 /* Temporarily avoid any problems with windows that are smaller
6197 than they are supposed to be. */
6198 window_min_height = 1;
6199 window_min_width = 1;
6201 /* Kludge Alert!
6202 Mark all windows now on frame as "deleted".
6203 Restoring the new configuration "undeletes" any that are in it.
6205 Save their current buffers in their height fields, since we may
6206 need it later, if a buffer saved in the configuration is now
6207 dead. */
6208 delete_all_subwindows (XWINDOW (FRAME_ROOT_WINDOW (f)));
6210 for (k = 0; k < saved_windows->size; k++)
6212 p = SAVED_WINDOW_N (saved_windows, k);
6213 w = XWINDOW (p->window);
6214 w->next = Qnil;
6216 if (!NILP (p->parent))
6217 w->parent = SAVED_WINDOW_N (saved_windows,
6218 XFASTINT (p->parent))->window;
6219 else
6220 w->parent = Qnil;
6222 if (!NILP (p->prev))
6224 w->prev = SAVED_WINDOW_N (saved_windows,
6225 XFASTINT (p->prev))->window;
6226 XWINDOW (w->prev)->next = p->window;
6228 else
6230 w->prev = Qnil;
6231 if (!NILP (w->parent))
6233 if (EQ (p->total_cols, XWINDOW (w->parent)->total_cols))
6235 XWINDOW (w->parent)->vchild = p->window;
6236 XWINDOW (w->parent)->hchild = Qnil;
6238 else
6240 XWINDOW (w->parent)->hchild = p->window;
6241 XWINDOW (w->parent)->vchild = Qnil;
6246 /* If we squirreled away the buffer in the window's height,
6247 restore it now. */
6248 if (BUFFERP (w->total_lines))
6249 w->buffer = w->total_lines;
6250 w->left_col = p->left_col;
6251 w->top_line = p->top_line;
6252 w->total_cols = p->total_cols;
6253 w->total_lines = p->total_lines;
6254 w->hscroll = p->hscroll;
6255 w->min_hscroll = p->min_hscroll;
6256 w->display_table = p->display_table;
6257 w->orig_top_line = p->orig_top_line;
6258 w->orig_total_lines = p->orig_total_lines;
6259 w->left_margin_cols = p->left_margin_cols;
6260 w->right_margin_cols = p->right_margin_cols;
6261 w->left_fringe_width = p->left_fringe_width;
6262 w->right_fringe_width = p->right_fringe_width;
6263 w->fringes_outside_margins = p->fringes_outside_margins;
6264 w->scroll_bar_width = p->scroll_bar_width;
6265 w->vertical_scroll_bar_type = p->vertical_scroll_bar_type;
6266 w->dedicated = p->dedicated;
6267 XSETFASTINT (w->last_modified, 0);
6268 XSETFASTINT (w->last_overlay_modified, 0);
6270 /* Reinstall the saved buffer and pointers into it. */
6271 if (NILP (p->buffer))
6272 w->buffer = p->buffer;
6273 else
6275 if (!NILP (XBUFFER (p->buffer)->name))
6276 /* If saved buffer is alive, install it. */
6278 w->buffer = p->buffer;
6279 w->start_at_line_beg = p->start_at_line_beg;
6280 set_marker_restricted (w->start, p->start, w->buffer);
6281 set_marker_restricted (w->pointm, p->pointm, w->buffer);
6282 Fset_marker (XBUFFER (w->buffer)->mark,
6283 p->mark, w->buffer);
6285 /* As documented in Fcurrent_window_configuration, don't
6286 restore the location of point in the buffer which was
6287 current when the window configuration was recorded. */
6288 if (!EQ (p->buffer, new_current_buffer)
6289 && XBUFFER (p->buffer) == current_buffer)
6290 Fgoto_char (w->pointm);
6292 else if (NILP (w->buffer) || NILP (XBUFFER (w->buffer)->name))
6293 /* Else unless window has a live buffer, get one. */
6295 w->buffer = Fcdr (Fcar (Vbuffer_alist));
6296 /* This will set the markers to beginning of visible
6297 range. */
6298 set_marker_restricted (w->start, make_number (0), w->buffer);
6299 set_marker_restricted (w->pointm, make_number (0),w->buffer);
6300 w->start_at_line_beg = Qt;
6302 else
6303 /* Keeping window's old buffer; make sure the markers
6304 are real. */
6306 /* Set window markers at start of visible range. */
6307 if (XMARKER (w->start)->buffer == 0)
6308 set_marker_restricted (w->start, make_number (0),
6309 w->buffer);
6310 if (XMARKER (w->pointm)->buffer == 0)
6311 set_marker_restricted_both (w->pointm, w->buffer,
6312 BUF_PT (XBUFFER (w->buffer)),
6313 BUF_PT_BYTE (XBUFFER (w->buffer)));
6314 w->start_at_line_beg = Qt;
6319 FRAME_ROOT_WINDOW (f) = data->root_window;
6320 /* Prevent "swapping out point" in the old selected window
6321 using the buffer that has been restored into it.
6322 We already swapped out point that from that window's old buffer. */
6323 selected_window = Qnil;
6325 /* Arrange *not* to restore point in the buffer that was
6326 current when the window configuration was saved. */
6327 if (EQ (XWINDOW (data->current_window)->buffer, new_current_buffer))
6328 set_marker_restricted (XWINDOW (data->current_window)->pointm,
6329 make_number (old_point),
6330 XWINDOW (data->current_window)->buffer);
6332 Fselect_window (data->current_window, Qnil);
6333 XBUFFER (XWINDOW (selected_window)->buffer)->last_selected_window
6334 = selected_window;
6336 if (NILP (data->focus_frame)
6337 || (FRAMEP (data->focus_frame)
6338 && FRAME_LIVE_P (XFRAME (data->focus_frame))))
6339 Fredirect_frame_focus (frame, data->focus_frame);
6341 #if 0 /* I don't understand why this is needed, and it causes problems
6342 when the frame's old selected window has been deleted. */
6343 if (f != selected_frame && FRAME_WINDOW_P (f))
6344 do_switch_frame (WINDOW_FRAME (XWINDOW (data->root_window)),
6345 0, 0);
6346 #endif
6348 /* Set the screen height to the value it had before this function. */
6349 if (previous_frame_lines != FRAME_LINES (f)
6350 || previous_frame_cols != FRAME_COLS (f))
6351 change_frame_size (f, previous_frame_lines, previous_frame_cols,
6352 0, 0, 0);
6353 #if defined (HAVE_WINDOW_SYSTEM) || defined (MSDOS)
6354 if (previous_frame_menu_bar_lines != FRAME_MENU_BAR_LINES (f))
6355 x_set_menu_bar_lines (f, make_number (previous_frame_menu_bar_lines),
6356 make_number (0));
6357 #ifdef HAVE_WINDOW_SYSTEM
6358 if (previous_frame_tool_bar_lines != FRAME_TOOL_BAR_LINES (f))
6359 x_set_tool_bar_lines (f, make_number (previous_frame_tool_bar_lines),
6360 make_number (0));
6361 #endif
6362 #endif
6364 /* Now, free glyph matrices in windows that were not reused. */
6365 for (i = n = 0; i < n_leaf_windows; ++i)
6367 if (NILP (leaf_windows[i]->buffer))
6369 /* Assert it's not reused as a combination. */
6370 xassert (NILP (leaf_windows[i]->hchild)
6371 && NILP (leaf_windows[i]->vchild));
6372 free_window_matrices (leaf_windows[i]);
6374 else if (EQ (leaf_windows[i]->buffer, new_current_buffer))
6375 ++n;
6378 adjust_glyphs (f);
6380 UNBLOCK_INPUT;
6382 /* Fselect_window will have made f the selected frame, so we
6383 reselect the proper frame here. Fhandle_switch_frame will change the
6384 selected window too, but that doesn't make the call to
6385 Fselect_window above totally superfluous; it still sets f's
6386 selected window. */
6387 if (FRAME_LIVE_P (XFRAME (data->selected_frame)))
6388 do_switch_frame (data->selected_frame, 0, 0);
6390 if (! NILP (Vwindow_configuration_change_hook)
6391 && ! NILP (Vrun_hooks))
6392 call1 (Vrun_hooks, Qwindow_configuration_change_hook);
6395 if (!NILP (new_current_buffer))
6396 Fset_buffer (new_current_buffer);
6398 /* Restore the minimum heights recorded in the configuration. */
6399 window_min_height = XINT (data->min_height);
6400 window_min_width = XINT (data->min_width);
6402 Vminibuf_scroll_window = data->minibuf_scroll_window;
6403 minibuf_selected_window = data->minibuf_selected_window;
6405 return (FRAME_LIVE_P (f) ? Qt : Qnil);
6408 /* Mark all windows now on frame as deleted
6409 by setting their buffers to nil. */
6411 void
6412 delete_all_subwindows (w)
6413 register struct window *w;
6415 if (!NILP (w->next))
6416 delete_all_subwindows (XWINDOW (w->next));
6417 if (!NILP (w->vchild))
6418 delete_all_subwindows (XWINDOW (w->vchild));
6419 if (!NILP (w->hchild))
6420 delete_all_subwindows (XWINDOW (w->hchild));
6422 w->total_lines = w->buffer; /* See Fset_window_configuration for excuse. */
6424 if (!NILP (w->buffer))
6425 unshow_buffer (w);
6427 /* We set all three of these fields to nil, to make sure that we can
6428 distinguish this dead window from any live window. Live leaf
6429 windows will have buffer set, and combination windows will have
6430 vchild or hchild set. */
6431 w->buffer = Qnil;
6432 w->vchild = Qnil;
6433 w->hchild = Qnil;
6435 Vwindow_list = Qnil;
6438 static int
6439 count_windows (window)
6440 register struct window *window;
6442 register int count = 1;
6443 if (!NILP (window->next))
6444 count += count_windows (XWINDOW (window->next));
6445 if (!NILP (window->vchild))
6446 count += count_windows (XWINDOW (window->vchild));
6447 if (!NILP (window->hchild))
6448 count += count_windows (XWINDOW (window->hchild));
6449 return count;
6453 /* Fill vector FLAT with leaf windows under W, starting at index I.
6454 Value is last index + 1. */
6456 static int
6457 get_leaf_windows (w, flat, i)
6458 struct window *w;
6459 struct window **flat;
6460 int i;
6462 while (w)
6464 if (!NILP (w->hchild))
6465 i = get_leaf_windows (XWINDOW (w->hchild), flat, i);
6466 else if (!NILP (w->vchild))
6467 i = get_leaf_windows (XWINDOW (w->vchild), flat, i);
6468 else
6469 flat[i++] = w;
6471 w = NILP (w->next) ? 0 : XWINDOW (w->next);
6474 return i;
6478 /* Return a pointer to the glyph W's physical cursor is on. Value is
6479 null if W's current matrix is invalid, so that no meaningfull glyph
6480 can be returned. */
6482 struct glyph *
6483 get_phys_cursor_glyph (w)
6484 struct window *w;
6486 struct glyph_row *row;
6487 struct glyph *glyph;
6489 if (w->phys_cursor.vpos >= 0
6490 && w->phys_cursor.vpos < w->current_matrix->nrows
6491 && (row = MATRIX_ROW (w->current_matrix, w->phys_cursor.vpos),
6492 row->enabled_p)
6493 && row->used[TEXT_AREA] > w->phys_cursor.hpos)
6494 glyph = row->glyphs[TEXT_AREA] + w->phys_cursor.hpos;
6495 else
6496 glyph = NULL;
6498 return glyph;
6502 static int
6503 save_window_save (window, vector, i)
6504 Lisp_Object window;
6505 struct Lisp_Vector *vector;
6506 int i;
6508 register struct saved_window *p;
6509 register struct window *w;
6510 register Lisp_Object tem;
6512 for (;!NILP (window); window = w->next)
6514 p = SAVED_WINDOW_N (vector, i);
6515 w = XWINDOW (window);
6517 XSETFASTINT (w->temslot, i); i++;
6518 p->window = window;
6519 p->buffer = w->buffer;
6520 p->left_col = w->left_col;
6521 p->top_line = w->top_line;
6522 p->total_cols = w->total_cols;
6523 p->total_lines = w->total_lines;
6524 p->hscroll = w->hscroll;
6525 p->min_hscroll = w->min_hscroll;
6526 p->display_table = w->display_table;
6527 p->orig_top_line = w->orig_top_line;
6528 p->orig_total_lines = w->orig_total_lines;
6529 p->left_margin_cols = w->left_margin_cols;
6530 p->right_margin_cols = w->right_margin_cols;
6531 p->left_fringe_width = w->left_fringe_width;
6532 p->right_fringe_width = w->right_fringe_width;
6533 p->fringes_outside_margins = w->fringes_outside_margins;
6534 p->scroll_bar_width = w->scroll_bar_width;
6535 p->vertical_scroll_bar_type = w->vertical_scroll_bar_type;
6536 p->dedicated = w->dedicated;
6537 if (!NILP (w->buffer))
6539 /* Save w's value of point in the window configuration.
6540 If w is the selected window, then get the value of point
6541 from the buffer; pointm is garbage in the selected window. */
6542 if (EQ (window, selected_window))
6544 p->pointm = Fmake_marker ();
6545 set_marker_both (p->pointm, w->buffer,
6546 BUF_PT (XBUFFER (w->buffer)),
6547 BUF_PT_BYTE (XBUFFER (w->buffer)));
6549 else
6550 p->pointm = Fcopy_marker (w->pointm, Qnil);
6552 p->start = Fcopy_marker (w->start, Qnil);
6553 p->start_at_line_beg = w->start_at_line_beg;
6555 tem = XBUFFER (w->buffer)->mark;
6556 p->mark = Fcopy_marker (tem, Qnil);
6558 else
6560 p->pointm = Qnil;
6561 p->start = Qnil;
6562 p->mark = Qnil;
6563 p->start_at_line_beg = Qnil;
6566 if (NILP (w->parent))
6567 p->parent = Qnil;
6568 else
6569 p->parent = XWINDOW (w->parent)->temslot;
6571 if (NILP (w->prev))
6572 p->prev = Qnil;
6573 else
6574 p->prev = XWINDOW (w->prev)->temslot;
6576 if (!NILP (w->vchild))
6577 i = save_window_save (w->vchild, vector, i);
6578 if (!NILP (w->hchild))
6579 i = save_window_save (w->hchild, vector, i);
6582 return i;
6585 DEFUN ("current-window-configuration", Fcurrent_window_configuration,
6586 Scurrent_window_configuration, 0, 1, 0,
6587 doc: /* Return an object representing the current window configuration of FRAME.
6588 If FRAME is nil or omitted, use the selected frame.
6589 This describes the number of windows, their sizes and current buffers,
6590 and for each displayed buffer, where display starts, and the positions of
6591 point and mark. An exception is made for point in the current buffer:
6592 its value is -not- saved.
6593 This also records the currently selected frame, and FRAME's focus
6594 redirection (see `redirect-frame-focus'). */)
6595 (frame)
6596 Lisp_Object frame;
6598 register Lisp_Object tem;
6599 register int n_windows;
6600 register struct save_window_data *data;
6601 register struct Lisp_Vector *vec;
6602 register int i;
6603 FRAME_PTR f;
6605 if (NILP (frame))
6606 frame = selected_frame;
6607 CHECK_LIVE_FRAME (frame);
6608 f = XFRAME (frame);
6610 n_windows = count_windows (XWINDOW (FRAME_ROOT_WINDOW (f)));
6611 vec = allocate_other_vector (VECSIZE (struct save_window_data));
6612 data = (struct save_window_data *)vec;
6614 XSETFASTINT (data->frame_cols, FRAME_COLS (f));
6615 XSETFASTINT (data->frame_lines, FRAME_LINES (f));
6616 XSETFASTINT (data->frame_menu_bar_lines, FRAME_MENU_BAR_LINES (f));
6617 XSETFASTINT (data->frame_tool_bar_lines, FRAME_TOOL_BAR_LINES (f));
6618 data->selected_frame = selected_frame;
6619 data->current_window = FRAME_SELECTED_WINDOW (f);
6620 XSETBUFFER (data->current_buffer, current_buffer);
6621 data->minibuf_scroll_window = minibuf_level > 0 ? Vminibuf_scroll_window : Qnil;
6622 data->minibuf_selected_window = minibuf_level > 0 ? minibuf_selected_window : Qnil;
6623 data->root_window = FRAME_ROOT_WINDOW (f);
6624 data->focus_frame = FRAME_FOCUS_FRAME (f);
6625 XSETINT (data->min_height, window_min_height);
6626 XSETINT (data->min_width, window_min_width);
6627 tem = Fmake_vector (make_number (n_windows), Qnil);
6628 data->saved_windows = tem;
6629 for (i = 0; i < n_windows; i++)
6630 XVECTOR (tem)->contents[i]
6631 = Fmake_vector (make_number (VECSIZE (struct saved_window)), Qnil);
6632 save_window_save (FRAME_ROOT_WINDOW (f), XVECTOR (tem), 0);
6633 XSETWINDOW_CONFIGURATION (tem, data);
6634 return (tem);
6637 DEFUN ("save-window-excursion", Fsave_window_excursion, Ssave_window_excursion,
6638 0, UNEVALLED, 0,
6639 doc: /* Execute BODY, preserving window sizes and contents.
6640 Return the value of the last form in BODY.
6641 Restore which buffer appears in which window, where display starts,
6642 and the value of point and mark for each window.
6643 Also restore the choice of selected window.
6644 Also restore which buffer is current.
6645 Does not restore the value of point in current buffer.
6646 usage: (save-window-excursion BODY ...) */)
6647 (args)
6648 Lisp_Object args;
6650 register Lisp_Object val;
6651 register int count = SPECPDL_INDEX ();
6653 record_unwind_protect (Fset_window_configuration,
6654 Fcurrent_window_configuration (Qnil));
6655 val = Fprogn (args);
6656 return unbind_to (count, val);
6661 /***********************************************************************
6662 Window Split Tree
6663 ***********************************************************************/
6665 static Lisp_Object
6666 window_tree (w)
6667 struct window *w;
6669 Lisp_Object tail = Qnil;
6670 Lisp_Object result = Qnil;
6672 while (w)
6674 Lisp_Object wn;
6676 XSETWINDOW (wn, w);
6677 if (!NILP (w->hchild))
6678 wn = Fcons (Qnil, Fcons (Fwindow_edges (wn),
6679 window_tree (XWINDOW (w->hchild))));
6680 else if (!NILP (w->vchild))
6681 wn = Fcons (Qt, Fcons (Fwindow_edges (wn),
6682 window_tree (XWINDOW (w->vchild))));
6684 if (NILP (result))
6686 result = tail = Fcons (wn, Qnil);
6688 else
6690 XSETCDR (tail, Fcons (wn, Qnil));
6691 tail = XCDR (tail);
6694 w = NILP (w->next) ? 0 : XWINDOW (w->next);
6697 return result;
6702 DEFUN ("window-tree", Fwindow_tree, Swindow_tree,
6703 0, 1, 0,
6704 doc: /* Return the window tree for frame FRAME.
6706 The return value is a list of the form (ROOT MINI), where ROOT
6707 represents the window tree of the frame's root window, and MINI
6708 is the frame's minibuffer window.
6710 If the root window is not split, ROOT is the root window itself.
6711 Otherwise, ROOT is a list (DIR EDGES W1 W2 ...) where DIR is nil for a
6712 horizontal split, and t for a vertical split, EDGES gives the combined
6713 size and position of the subwindows in the split, and the rest of the
6714 elements are the subwindows in the split. Each of the subwindows may
6715 again be a window or a list representing a window split, and so on.
6716 EDGES is a list \(LEFT TOP RIGHT BOTTOM) as returned by `window-edges'.
6718 If FRAME is nil or omitted, return information on the currently
6719 selected frame. */)
6720 (frame)
6721 Lisp_Object frame;
6723 FRAME_PTR f;
6725 if (NILP (frame))
6726 frame = selected_frame;
6728 CHECK_FRAME (frame);
6729 f = XFRAME (frame);
6731 if (!FRAME_LIVE_P (f))
6732 return Qnil;
6734 return window_tree (XWINDOW (FRAME_ROOT_WINDOW (f)));
6738 /***********************************************************************
6739 Marginal Areas
6740 ***********************************************************************/
6742 DEFUN ("set-window-margins", Fset_window_margins, Sset_window_margins,
6743 2, 3, 0,
6744 doc: /* Set width of marginal areas of window WINDOW.
6745 If WINDOW is nil, set margins of the currently selected window.
6746 Second arg LEFT-WIDTH specifies the number of character cells to
6747 reserve for the left marginal area. Optional third arg RIGHT-WIDTH
6748 does the same for the right marginal area. A nil width parameter
6749 means no margin. */)
6750 (window, left_width, right_width)
6751 Lisp_Object window, left_width, right_width;
6753 struct window *w = decode_window (window);
6755 /* Translate negative or zero widths to nil.
6756 Margins that are too wide have to be checked elsewhere. */
6758 if (!NILP (left_width))
6760 CHECK_NUMBER (left_width);
6761 if (XINT (left_width) <= 0)
6762 left_width = Qnil;
6765 if (!NILP (right_width))
6767 CHECK_NUMBER (right_width);
6768 if (XINT (right_width) <= 0)
6769 right_width = Qnil;
6772 if (!EQ (w->left_margin_cols, left_width)
6773 || !EQ (w->right_margin_cols, right_width))
6775 w->left_margin_cols = left_width;
6776 w->right_margin_cols = right_width;
6778 adjust_window_margins (w);
6780 ++windows_or_buffers_changed;
6781 adjust_glyphs (XFRAME (WINDOW_FRAME (w)));
6784 return Qnil;
6788 DEFUN ("window-margins", Fwindow_margins, Swindow_margins,
6789 0, 1, 0,
6790 doc: /* Get width of marginal areas of window WINDOW.
6791 If WINDOW is omitted or nil, use the currently selected window.
6792 Value is a cons of the form (LEFT-WIDTH . RIGHT-WIDTH).
6793 If a marginal area does not exist, its width will be returned
6794 as nil. */)
6795 (window)
6796 Lisp_Object window;
6798 struct window *w = decode_window (window);
6799 return Fcons (w->left_margin_cols, w->right_margin_cols);
6804 /***********************************************************************
6805 Fringes
6806 ***********************************************************************/
6808 DEFUN ("set-window-fringes", Fset_window_fringes, Sset_window_fringes,
6809 2, 4, 0,
6810 doc: /* Set the fringe widths of window WINDOW.
6811 If WINDOW is nil, set the fringe widths of the currently selected
6812 window.
6813 Second arg LEFT-WIDTH specifies the number of pixels to reserve for
6814 the left fringe. Optional third arg RIGHT-WIDTH specifies the right
6815 fringe width. If a fringe width arg is nil, that means to use the
6816 frame's default fringe width. Default fringe widths can be set with
6817 the command `set-fringe-style'.
6818 If optional fourth arg OUTSIDE-MARGINS is non-nil, draw the fringes
6819 outside of the display margins. By default, fringes are drawn between
6820 display marginal areas and the text area. */)
6821 (window, left_width, right_width, outside_margins)
6822 Lisp_Object window, left_width, right_width, outside_margins;
6824 struct window *w = decode_window (window);
6826 if (!NILP (left_width))
6827 CHECK_NATNUM (left_width);
6828 if (!NILP (right_width))
6829 CHECK_NATNUM (right_width);
6831 /* Do nothing on a tty. */
6832 if (FRAME_WINDOW_P (WINDOW_XFRAME (w))
6833 && (!EQ (w->left_fringe_width, left_width)
6834 || !EQ (w->right_fringe_width, right_width)
6835 || !EQ (w->fringes_outside_margins, outside_margins)))
6837 w->left_fringe_width = left_width;
6838 w->right_fringe_width = right_width;
6839 w->fringes_outside_margins = outside_margins;
6841 adjust_window_margins (w);
6843 clear_glyph_matrix (w->current_matrix);
6844 w->window_end_valid = Qnil;
6846 ++windows_or_buffers_changed;
6847 adjust_glyphs (XFRAME (WINDOW_FRAME (w)));
6850 return Qnil;
6854 DEFUN ("window-fringes", Fwindow_fringes, Swindow_fringes,
6855 0, 1, 0,
6856 doc: /* Get width of fringes of window WINDOW.
6857 If WINDOW is omitted or nil, use the currently selected window.
6858 Value is a list of the form (LEFT-WIDTH RIGHT-WIDTH OUTSIDE-MARGINS). */)
6859 (window)
6860 Lisp_Object window;
6862 struct window *w = decode_window (window);
6864 return Fcons (make_number (WINDOW_LEFT_FRINGE_WIDTH (w)),
6865 Fcons (make_number (WINDOW_RIGHT_FRINGE_WIDTH (w)),
6866 Fcons ((WINDOW_HAS_FRINGES_OUTSIDE_MARGINS (w)
6867 ? Qt : Qnil), Qnil)));
6872 /***********************************************************************
6873 Scroll bars
6874 ***********************************************************************/
6876 DEFUN ("set-window-scroll-bars", Fset_window_scroll_bars, Sset_window_scroll_bars,
6877 2, 4, 0,
6878 doc: /* Set width and type of scroll bars of window WINDOW.
6879 If window is nil, set scroll bars of the currently selected window.
6880 Second parameter WIDTH specifies the pixel width for the scroll bar;
6881 this is automatically adjusted to a multiple of the frame column width.
6882 Third parameter VERTICAL-TYPE specifies the type of the vertical scroll
6883 bar: left, right, or nil.
6884 If WIDTH is nil, use the frame's scroll-bar width.
6885 If VERTICAL-TYPE is t, use the frame's scroll-bar type.
6886 Fourth parameter HORIZONTAL-TYPE is currently unused. */)
6887 (window, width, vertical_type, horizontal_type)
6888 Lisp_Object window, width, vertical_type, horizontal_type;
6890 struct window *w = decode_window (window);
6892 if (!NILP (width))
6894 CHECK_NATNUM (width);
6896 if (XINT (width) == 0)
6897 vertical_type = Qnil;
6900 if (!(EQ (vertical_type, Qnil)
6901 || EQ (vertical_type, Qleft)
6902 || EQ (vertical_type, Qright)
6903 || EQ (vertical_type, Qt)))
6904 error ("Invalid type of vertical scroll bar");
6906 if (!EQ (w->scroll_bar_width, width)
6907 || !EQ (w->vertical_scroll_bar_type, vertical_type))
6909 w->scroll_bar_width = width;
6910 w->vertical_scroll_bar_type = vertical_type;
6912 adjust_window_margins (w);
6914 clear_glyph_matrix (w->current_matrix);
6915 w->window_end_valid = Qnil;
6917 ++windows_or_buffers_changed;
6918 adjust_glyphs (XFRAME (WINDOW_FRAME (w)));
6921 return Qnil;
6925 DEFUN ("window-scroll-bars", Fwindow_scroll_bars, Swindow_scroll_bars,
6926 0, 1, 0,
6927 doc: /* Get width and type of scroll bars of window WINDOW.
6928 If WINDOW is omitted or nil, use the currently selected window.
6929 Value is a list of the form (WIDTH COLS VERTICAL-TYPE HORIZONTAL-TYPE).
6930 If WIDTH is nil or TYPE is t, the window is using the frame's corresponding
6931 value. */)
6932 (window)
6933 Lisp_Object window;
6935 struct window *w = decode_window (window);
6936 return Fcons (make_number ((WINDOW_CONFIG_SCROLL_BAR_WIDTH (w)
6937 ? WINDOW_CONFIG_SCROLL_BAR_WIDTH (w)
6938 : WINDOW_SCROLL_BAR_AREA_WIDTH (w))),
6939 Fcons (make_number (WINDOW_SCROLL_BAR_COLS (w)),
6940 Fcons (w->vertical_scroll_bar_type,
6941 Fcons (Qnil, Qnil))));
6946 /***********************************************************************
6947 Smooth scrolling
6948 ***********************************************************************/
6950 DEFUN ("window-vscroll", Fwindow_vscroll, Swindow_vscroll, 0, 2, 0,
6951 doc: /* Return the amount by which WINDOW is scrolled vertically.
6952 Use the selected window if WINDOW is nil or omitted.
6953 Normally, value is a multiple of the canonical character height of WINDOW;
6954 optional second arg PIXELS-P means value is measured in pixels. */)
6955 (window, pixels_p)
6956 Lisp_Object window, pixels_p;
6958 Lisp_Object result;
6959 struct frame *f;
6960 struct window *w;
6962 if (NILP (window))
6963 window = selected_window;
6964 else
6965 CHECK_WINDOW (window);
6966 w = XWINDOW (window);
6967 f = XFRAME (w->frame);
6969 if (FRAME_WINDOW_P (f))
6970 result = (NILP (pixels_p)
6971 ? FRAME_CANON_Y_FROM_PIXEL_Y (f, -w->vscroll)
6972 : make_number (-w->vscroll));
6973 else
6974 result = make_number (0);
6975 return result;
6979 DEFUN ("set-window-vscroll", Fset_window_vscroll, Sset_window_vscroll,
6980 2, 3, 0,
6981 doc: /* Set amount by which WINDOW should be scrolled vertically to VSCROLL.
6982 WINDOW nil means use the selected window. Normally, VSCROLL is a
6983 non-negative multiple of the canonical character height of WINDOW;
6984 optional third arg PIXELS-P non-nil means that VSCROLL is in pixels.
6985 If PIXELS-P is nil, VSCROLL may have to be rounded so that it
6986 corresponds to an integral number of pixels. The return value is the
6987 result of this rounding.
6988 If PIXELS-P is non-nil, the return value is VSCROLL. */)
6989 (window, vscroll, pixels_p)
6990 Lisp_Object window, vscroll, pixels_p;
6992 struct window *w;
6993 struct frame *f;
6995 if (NILP (window))
6996 window = selected_window;
6997 else
6998 CHECK_WINDOW (window);
6999 CHECK_NUMBER_OR_FLOAT (vscroll);
7001 w = XWINDOW (window);
7002 f = XFRAME (w->frame);
7004 if (FRAME_WINDOW_P (f))
7006 int old_dy = w->vscroll;
7008 w->vscroll = - (NILP (pixels_p)
7009 ? FRAME_LINE_HEIGHT (f) * XFLOATINT (vscroll)
7010 : XFLOATINT (vscroll));
7011 w->vscroll = min (w->vscroll, 0);
7013 if (w->vscroll != old_dy)
7015 /* Adjust glyph matrix of the frame if the virtual display
7016 area becomes larger than before. */
7017 if (w->vscroll < 0 && w->vscroll < old_dy)
7018 adjust_glyphs (f);
7020 /* Prevent redisplay shortcuts. */
7021 XBUFFER (w->buffer)->prevent_redisplay_optimizations_p = 1;
7025 return Fwindow_vscroll (window, pixels_p);
7029 /* Call FN for all leaf windows on frame F. FN is called with the
7030 first argument being a pointer to the leaf window, and with
7031 additional argument USER_DATA. Stops when FN returns 0. */
7033 void
7034 foreach_window (f, fn, user_data)
7035 struct frame *f;
7036 int (* fn) P_ ((struct window *, void *));
7037 void *user_data;
7039 /* Fdelete_frame may set FRAME_ROOT_WINDOW (f) to Qnil. */
7040 if (WINDOWP (FRAME_ROOT_WINDOW (f)))
7041 foreach_window_1 (XWINDOW (FRAME_ROOT_WINDOW (f)), fn, user_data);
7045 /* Helper function for foreach_window. Call FN for all leaf windows
7046 reachable from W. FN is called with the first argument being a
7047 pointer to the leaf window, and with additional argument USER_DATA.
7048 Stop when FN returns 0. Value is 0 if stopped by FN. */
7050 static int
7051 foreach_window_1 (w, fn, user_data)
7052 struct window *w;
7053 int (* fn) P_ ((struct window *, void *));
7054 void *user_data;
7056 int cont;
7058 for (cont = 1; w && cont;)
7060 if (!NILP (w->hchild))
7061 cont = foreach_window_1 (XWINDOW (w->hchild), fn, user_data);
7062 else if (!NILP (w->vchild))
7063 cont = foreach_window_1 (XWINDOW (w->vchild), fn, user_data);
7064 else
7065 cont = fn (w, user_data);
7067 w = NILP (w->next) ? 0 : XWINDOW (w->next);
7070 return cont;
7074 /* Freeze or unfreeze the window start of W unless it is a
7075 mini-window or the selected window. FREEZE_P non-null means freeze
7076 the window start. */
7078 static int
7079 freeze_window_start (w, freeze_p)
7080 struct window *w;
7081 void *freeze_p;
7083 if (w == XWINDOW (selected_window)
7084 || MINI_WINDOW_P (w)
7085 || (MINI_WINDOW_P (XWINDOW (selected_window))
7086 && ! NILP (Vminibuf_scroll_window)
7087 && w == XWINDOW (Vminibuf_scroll_window)))
7088 freeze_p = NULL;
7090 w->frozen_window_start_p = freeze_p != NULL;
7091 return 1;
7095 /* Freeze or unfreeze the window starts of all leaf windows on frame
7096 F, except the selected window and a mini-window. FREEZE_P non-zero
7097 means freeze the window start. */
7099 void
7100 freeze_window_starts (f, freeze_p)
7101 struct frame *f;
7102 int freeze_p;
7104 foreach_window (f, freeze_window_start, (void *) (freeze_p ? f : 0));
7108 /***********************************************************************
7109 Initialization
7110 ***********************************************************************/
7112 /* Return 1 if window configurations C1 and C2
7113 describe the same state of affairs. This is used by Fequal. */
7116 compare_window_configurations (c1, c2, ignore_positions)
7117 Lisp_Object c1, c2;
7118 int ignore_positions;
7120 register struct save_window_data *d1, *d2;
7121 struct Lisp_Vector *sw1, *sw2;
7122 int i;
7124 CHECK_WINDOW_CONFIGURATION (c1);
7125 CHECK_WINDOW_CONFIGURATION (c2);
7127 d1 = (struct save_window_data *) XVECTOR (c1);
7128 d2 = (struct save_window_data *) XVECTOR (c2);
7129 sw1 = XVECTOR (d1->saved_windows);
7130 sw2 = XVECTOR (d2->saved_windows);
7132 if (! EQ (d1->frame_cols, d2->frame_cols))
7133 return 0;
7134 if (! EQ (d1->frame_lines, d2->frame_lines))
7135 return 0;
7136 if (! EQ (d1->frame_menu_bar_lines, d2->frame_menu_bar_lines))
7137 return 0;
7138 if (! EQ (d1->selected_frame, d2->selected_frame))
7139 return 0;
7140 /* Don't compare the current_window field directly.
7141 Instead see w1_is_current and w2_is_current, below. */
7142 if (! EQ (d1->current_buffer, d2->current_buffer))
7143 return 0;
7144 if (! ignore_positions)
7146 if (! EQ (d1->minibuf_scroll_window, d2->minibuf_scroll_window))
7147 return 0;
7148 if (! EQ (d1->minibuf_selected_window, d2->minibuf_selected_window))
7149 return 0;
7151 /* Don't compare the root_window field.
7152 We don't require the two configurations
7153 to use the same window object,
7154 and the two root windows must be equivalent
7155 if everything else compares equal. */
7156 if (! EQ (d1->focus_frame, d2->focus_frame))
7157 return 0;
7158 if (! EQ (d1->min_width, d2->min_width))
7159 return 0;
7160 if (! EQ (d1->min_height, d2->min_height))
7161 return 0;
7163 /* Verify that the two confis have the same number of windows. */
7164 if (sw1->size != sw2->size)
7165 return 0;
7167 for (i = 0; i < sw1->size; i++)
7169 struct saved_window *p1, *p2;
7170 int w1_is_current, w2_is_current;
7172 p1 = SAVED_WINDOW_N (sw1, i);
7173 p2 = SAVED_WINDOW_N (sw2, i);
7175 /* Verify that the current windows in the two
7176 configurations correspond to each other. */
7177 w1_is_current = EQ (d1->current_window, p1->window);
7178 w2_is_current = EQ (d2->current_window, p2->window);
7180 if (w1_is_current != w2_is_current)
7181 return 0;
7183 /* Verify that the corresponding windows do match. */
7184 if (! EQ (p1->buffer, p2->buffer))
7185 return 0;
7186 if (! EQ (p1->left_col, p2->left_col))
7187 return 0;
7188 if (! EQ (p1->top_line, p2->top_line))
7189 return 0;
7190 if (! EQ (p1->total_cols, p2->total_cols))
7191 return 0;
7192 if (! EQ (p1->total_lines, p2->total_lines))
7193 return 0;
7194 if (! EQ (p1->display_table, p2->display_table))
7195 return 0;
7196 if (! EQ (p1->parent, p2->parent))
7197 return 0;
7198 if (! EQ (p1->prev, p2->prev))
7199 return 0;
7200 if (! ignore_positions)
7202 if (! EQ (p1->hscroll, p2->hscroll))
7203 return 0;
7204 if (!EQ (p1->min_hscroll, p2->min_hscroll))
7205 return 0;
7206 if (! EQ (p1->start_at_line_beg, p2->start_at_line_beg))
7207 return 0;
7208 if (NILP (Fequal (p1->start, p2->start)))
7209 return 0;
7210 if (NILP (Fequal (p1->pointm, p2->pointm)))
7211 return 0;
7212 if (NILP (Fequal (p1->mark, p2->mark)))
7213 return 0;
7215 if (! EQ (p1->left_margin_cols, p2->left_margin_cols))
7216 return 0;
7217 if (! EQ (p1->right_margin_cols, p2->right_margin_cols))
7218 return 0;
7219 if (! EQ (p1->left_fringe_width, p2->left_fringe_width))
7220 return 0;
7221 if (! EQ (p1->right_fringe_width, p2->right_fringe_width))
7222 return 0;
7223 if (! EQ (p1->fringes_outside_margins, p2->fringes_outside_margins))
7224 return 0;
7225 if (! EQ (p1->scroll_bar_width, p2->scroll_bar_width))
7226 return 0;
7227 if (! EQ (p1->vertical_scroll_bar_type, p2->vertical_scroll_bar_type))
7228 return 0;
7231 return 1;
7234 DEFUN ("compare-window-configurations", Fcompare_window_configurations,
7235 Scompare_window_configurations, 2, 2, 0,
7236 doc: /* Compare two window configurations as regards the structure of windows.
7237 This function ignores details such as the values of point and mark
7238 and scrolling positions. */)
7239 (x, y)
7240 Lisp_Object x, y;
7242 if (compare_window_configurations (x, y, 1))
7243 return Qt;
7244 return Qnil;
7247 void
7248 init_window_once ()
7250 struct frame *f = make_terminal_frame ();
7251 XSETFRAME (selected_frame, f);
7252 Vterminal_frame = selected_frame;
7253 minibuf_window = f->minibuffer_window;
7254 selected_window = f->selected_window;
7255 last_nonminibuf_frame = f;
7257 window_initialized = 1;
7260 void
7261 init_window ()
7263 Vwindow_list = Qnil;
7266 void
7267 syms_of_window ()
7269 Qscroll_up = intern ("scroll-up");
7270 staticpro (&Qscroll_up);
7272 Qscroll_down = intern ("scroll-down");
7273 staticpro (&Qscroll_down);
7275 Qwindow_size_fixed = intern ("window-size-fixed");
7276 staticpro (&Qwindow_size_fixed);
7277 Fset (Qwindow_size_fixed, Qnil);
7279 staticpro (&Qwindow_configuration_change_hook);
7280 Qwindow_configuration_change_hook
7281 = intern ("window-configuration-change-hook");
7283 Qwindowp = intern ("windowp");
7284 staticpro (&Qwindowp);
7286 Qwindow_configuration_p = intern ("window-configuration-p");
7287 staticpro (&Qwindow_configuration_p);
7289 Qwindow_live_p = intern ("window-live-p");
7290 staticpro (&Qwindow_live_p);
7292 Qtemp_buffer_show_hook = intern ("temp-buffer-show-hook");
7293 staticpro (&Qtemp_buffer_show_hook);
7295 staticpro (&Vwindow_list);
7297 minibuf_selected_window = Qnil;
7298 staticpro (&minibuf_selected_window);
7300 window_scroll_pixel_based_preserve_y = -1;
7302 DEFVAR_LISP ("temp-buffer-show-function", &Vtemp_buffer_show_function,
7303 doc: /* Non-nil means call as function to display a help buffer.
7304 The function is called with one argument, the buffer to be displayed.
7305 Used by `with-output-to-temp-buffer'.
7306 If this function is used, then it must do the entire job of showing
7307 the buffer; `temp-buffer-show-hook' is not run unless this function runs it. */);
7308 Vtemp_buffer_show_function = Qnil;
7310 DEFVAR_LISP ("display-buffer-function", &Vdisplay_buffer_function,
7311 doc: /* If non-nil, function to call to handle `display-buffer'.
7312 It will receive two args, the buffer and a flag which if non-nil means
7313 that the currently selected window is not acceptable.
7314 It should choose or create a window, display the specified buffer in it,
7315 and return the window.
7316 Commands such as `switch-to-buffer-other-window' and `find-file-other-window'
7317 work using this function. */);
7318 Vdisplay_buffer_function = Qnil;
7320 DEFVAR_LISP ("even-window-heights", &Veven_window_heights,
7321 doc: /* *If non-nil, `display-buffer' should even the window heights.
7322 If nil, `display-buffer' will leave the window configuration alone. */);
7323 Veven_window_heights = Qt;
7325 DEFVAR_LISP ("minibuffer-scroll-window", &Vminibuf_scroll_window,
7326 doc: /* Non-nil means it is the window that C-M-v in minibuffer should scroll. */);
7327 Vminibuf_scroll_window = Qnil;
7329 DEFVAR_BOOL ("mode-line-in-non-selected-windows", &mode_line_in_non_selected_windows,
7330 doc: /* Non-nil means to use `mode-line-inactive' face in non-selected windows.
7331 If the minibuffer is active, the `minibuffer-scroll-window' mode line
7332 is displayed in the `mode-line' face. */);
7333 mode_line_in_non_selected_windows = 1;
7335 DEFVAR_LISP ("other-window-scroll-buffer", &Vother_window_scroll_buffer,
7336 doc: /* If non-nil, this is a buffer and \\[scroll-other-window] should scroll its window. */);
7337 Vother_window_scroll_buffer = Qnil;
7339 DEFVAR_BOOL ("pop-up-frames", &pop_up_frames,
7340 doc: /* *Non-nil means `display-buffer' should make a separate frame. */);
7341 pop_up_frames = 0;
7343 DEFVAR_BOOL ("auto-window-vscroll", &auto_window_vscroll_p,
7344 doc: /* *Non-nil means to automatically adjust `window-vscroll' to view tall lines. */);
7345 auto_window_vscroll_p = 1;
7347 DEFVAR_BOOL ("display-buffer-reuse-frames", &display_buffer_reuse_frames,
7348 doc: /* *Non-nil means `display-buffer' should reuse frames.
7349 If the buffer in question is already displayed in a frame, raise that frame. */);
7350 display_buffer_reuse_frames = 0;
7352 DEFVAR_LISP ("pop-up-frame-function", &Vpop_up_frame_function,
7353 doc: /* Function to call to handle automatic new frame creation.
7354 It is called with no arguments and should return a newly created frame.
7356 A typical value might be `(lambda () (new-frame pop-up-frame-alist))'
7357 where `pop-up-frame-alist' would hold the default frame parameters. */);
7358 Vpop_up_frame_function = Qnil;
7360 DEFVAR_LISP ("special-display-buffer-names", &Vspecial_display_buffer_names,
7361 doc: /* *List of buffer names that should have their own special frames.
7362 Displaying a buffer with `display-buffer' or `pop-to-buffer',
7363 if its name is in this list, makes a special frame for it
7364 using `special-display-function'. See also `special-display-regexps'.
7366 An element of the list can be a list instead of just a string.
7367 There are two ways to use a list as an element:
7368 (BUFFER FRAME-PARAMETERS...) (BUFFER FUNCTION OTHER-ARGS...)
7369 In the first case, the FRAME-PARAMETERS are pairs of the form
7370 \(PARAMETER . VALUE); these parameter values are used to create the frame.
7371 In the second case, FUNCTION is called with BUFFER as the first argument,
7372 followed by the OTHER-ARGS--it can display BUFFER in any way it likes.
7373 All this is done by the function found in `special-display-function'.
7375 If the specified frame parameters include (same-buffer . t), the
7376 buffer is displayed in the currently selected window. Otherwise, if
7377 they include (same-frame . t), the buffer is displayed in a new window
7378 in the currently selected frame.
7380 If this variable appears \"not to work\", because you add a name to it
7381 but that buffer still appears in the selected window, look at the
7382 values of `same-window-buffer-names' and `same-window-regexps'.
7383 Those variables take precedence over this one. */);
7384 Vspecial_display_buffer_names = Qnil;
7386 DEFVAR_LISP ("special-display-regexps", &Vspecial_display_regexps,
7387 doc: /* *List of regexps saying which buffers should have their own special frames.
7388 When displaying a buffer with `display-buffer' or `pop-to-buffer',
7389 if any regexp in this list matches the buffer name, it makes a
7390 special frame for the buffer by calling `special-display-function'.
7392 An element of the list can be a list instead of just a string.
7393 There are two ways to use a list as an element:
7394 (REGEXP FRAME-PARAMETERS...) (REGEXP FUNCTION OTHER-ARGS...)
7395 In the first case, the FRAME-PARAMETERS are pairs of the form
7396 \(PARAMETER . VALUE); these parameter values are used to create the frame.
7397 In the second case, FUNCTION is called with BUFFER as the first argument,
7398 followed by the OTHER-ARGS--it can display the buffer in any way it likes.
7399 All this is done by the function found in `special-display-function'.
7401 If the specified frame parameters include (same-buffer . t), the
7402 buffer is displayed in the currently selected window. Otherwise, if
7403 they include (same-frame . t), the buffer is displayed in a new window
7404 in the currently selected frame.
7406 If this variable appears \"not to work\", because you add a regexp to it
7407 but the matching buffers still appear in the selected window, look at the
7408 values of `same-window-buffer-names' and `same-window-regexps'.
7409 Those variables take precedence over this one. */);
7410 Vspecial_display_regexps = Qnil;
7412 DEFVAR_LISP ("special-display-function", &Vspecial_display_function,
7413 doc: /* Function to call to make a new frame for a special buffer.
7414 It is called with two arguments, the buffer and optional buffer specific
7415 data, and should return a window displaying that buffer.
7416 The default value normally makes a separate frame for the buffer,
7417 using `special-display-frame-alist' to specify the frame parameters.
7418 But if the buffer specific data includes (same-buffer . t) then the
7419 buffer is displayed in the current selected window.
7420 Otherwise if it includes (same-frame . t) then the buffer is displayed in
7421 a new window in the currently selected frame.
7423 A buffer is special if it is listed in `special-display-buffer-names'
7424 or matches a regexp in `special-display-regexps'. */);
7425 Vspecial_display_function = Qnil;
7427 DEFVAR_LISP ("same-window-buffer-names", &Vsame_window_buffer_names,
7428 doc: /* *List of buffer names that should appear in the selected window.
7429 Displaying one of these buffers using `display-buffer' or `pop-to-buffer'
7430 switches to it in the selected window, rather than making it appear
7431 in some other window.
7433 An element of the list can be a cons cell instead of just a string.
7434 Then the car must be a string, which specifies the buffer name.
7435 This is for compatibility with `special-display-buffer-names';
7436 the cdr of the cons cell is ignored.
7438 See also `same-window-regexps'. */);
7439 Vsame_window_buffer_names = Qnil;
7441 DEFVAR_LISP ("same-window-regexps", &Vsame_window_regexps,
7442 doc: /* *List of regexps saying which buffers should appear in the selected window.
7443 If a buffer name matches one of these regexps, then displaying it
7444 using `display-buffer' or `pop-to-buffer' switches to it
7445 in the selected window, rather than making it appear in some other window.
7447 An element of the list can be a cons cell instead of just a string.
7448 Then the car must be a string, which specifies the buffer name.
7449 This is for compatibility with `special-display-buffer-names';
7450 the cdr of the cons cell is ignored.
7452 See also `same-window-buffer-names'. */);
7453 Vsame_window_regexps = Qnil;
7455 DEFVAR_BOOL ("pop-up-windows", &pop_up_windows,
7456 doc: /* *Non-nil means display-buffer should make new windows. */);
7457 pop_up_windows = 1;
7459 DEFVAR_INT ("next-screen-context-lines", &next_screen_context_lines,
7460 doc: /* *Number of lines of continuity when scrolling by screenfuls. */);
7461 next_screen_context_lines = 2;
7463 DEFVAR_INT ("split-height-threshold", &split_height_threshold,
7464 doc: /* *A window must be at least this tall to be eligible for splitting
7465 by `display-buffer'. The value is in line units.
7466 If there is only one window, it is split regardless of this value. */);
7467 split_height_threshold = 500;
7469 DEFVAR_INT ("window-min-height", &window_min_height,
7470 doc: /* *Delete any window less than this tall (including its mode line).
7471 The value is in line units. */);
7472 window_min_height = 4;
7474 DEFVAR_INT ("window-min-width", &window_min_width,
7475 doc: /* *Delete any window less than this wide (measured in characters). */);
7476 window_min_width = 10;
7478 DEFVAR_LISP ("scroll-preserve-screen-position",
7479 &Vscroll_preserve_screen_position,
7480 doc: /* *Controls if scroll commands move point to keep its screen line unchanged.
7481 A value of nil means point does not keep its screen position except
7482 at the scroll margin or window boundary respectively.
7483 A value of t means point keeps its screen position if the scroll
7484 command moved it vertically out of the window, e.g. when scrolling
7485 by full screens.
7486 Any other value means point always keeps its screen position. */);
7487 Vscroll_preserve_screen_position = Qnil;
7489 DEFVAR_LISP ("window-configuration-change-hook",
7490 &Vwindow_configuration_change_hook,
7491 doc: /* Functions to call when window configuration changes.
7492 The selected frame is the one whose configuration has changed. */);
7493 Vwindow_configuration_change_hook = Qnil;
7495 defsubr (&Sselected_window);
7496 defsubr (&Sminibuffer_window);
7497 defsubr (&Swindow_minibuffer_p);
7498 defsubr (&Swindowp);
7499 defsubr (&Swindow_live_p);
7500 defsubr (&Spos_visible_in_window_p);
7501 defsubr (&Swindow_line_height);
7502 defsubr (&Swindow_buffer);
7503 defsubr (&Swindow_height);
7504 defsubr (&Swindow_width);
7505 defsubr (&Swindow_hscroll);
7506 defsubr (&Sset_window_hscroll);
7507 defsubr (&Swindow_redisplay_end_trigger);
7508 defsubr (&Sset_window_redisplay_end_trigger);
7509 defsubr (&Swindow_edges);
7510 defsubr (&Swindow_pixel_edges);
7511 defsubr (&Swindow_inside_edges);
7512 defsubr (&Swindow_inside_pixel_edges);
7513 defsubr (&Scoordinates_in_window_p);
7514 defsubr (&Swindow_at);
7515 defsubr (&Swindow_point);
7516 defsubr (&Swindow_start);
7517 defsubr (&Swindow_end);
7518 defsubr (&Sset_window_point);
7519 defsubr (&Sset_window_start);
7520 defsubr (&Swindow_dedicated_p);
7521 defsubr (&Sset_window_dedicated_p);
7522 defsubr (&Swindow_display_table);
7523 defsubr (&Sset_window_display_table);
7524 defsubr (&Snext_window);
7525 defsubr (&Sprevious_window);
7526 defsubr (&Sother_window);
7527 defsubr (&Sget_lru_window);
7528 defsubr (&Sget_largest_window);
7529 defsubr (&Sget_buffer_window);
7530 defsubr (&Sdelete_other_windows);
7531 defsubr (&Sdelete_windows_on);
7532 defsubr (&Sreplace_buffer_in_windows);
7533 defsubr (&Sdelete_window);
7534 defsubr (&Sset_window_buffer);
7535 defsubr (&Sselect_window);
7536 defsubr (&Sspecial_display_p);
7537 defsubr (&Ssame_window_p);
7538 defsubr (&Sdisplay_buffer);
7539 defsubr (&Sforce_window_update);
7540 defsubr (&Ssplit_window);
7541 defsubr (&Senlarge_window);
7542 defsubr (&Sshrink_window);
7543 defsubr (&Sadjust_window_trailing_edge);
7544 defsubr (&Sscroll_up);
7545 defsubr (&Sscroll_down);
7546 defsubr (&Sscroll_left);
7547 defsubr (&Sscroll_right);
7548 defsubr (&Sother_window_for_scrolling);
7549 defsubr (&Sscroll_other_window);
7550 defsubr (&Sminibuffer_selected_window);
7551 defsubr (&Srecenter);
7552 defsubr (&Swindow_text_height);
7553 defsubr (&Smove_to_window_line);
7554 defsubr (&Swindow_configuration_p);
7555 defsubr (&Swindow_configuration_frame);
7556 defsubr (&Sset_window_configuration);
7557 defsubr (&Scurrent_window_configuration);
7558 defsubr (&Ssave_window_excursion);
7559 defsubr (&Swindow_tree);
7560 defsubr (&Sset_window_margins);
7561 defsubr (&Swindow_margins);
7562 defsubr (&Sset_window_fringes);
7563 defsubr (&Swindow_fringes);
7564 defsubr (&Sset_window_scroll_bars);
7565 defsubr (&Swindow_scroll_bars);
7566 defsubr (&Swindow_vscroll);
7567 defsubr (&Sset_window_vscroll);
7568 defsubr (&Scompare_window_configurations);
7569 defsubr (&Swindow_list);
7572 void
7573 keys_of_window ()
7575 initial_define_key (control_x_map, '1', "delete-other-windows");
7576 initial_define_key (control_x_map, '2', "split-window");
7577 initial_define_key (control_x_map, '0', "delete-window");
7578 initial_define_key (control_x_map, 'o', "other-window");
7579 initial_define_key (control_x_map, '^', "enlarge-window");
7580 initial_define_key (control_x_map, '<', "scroll-left");
7581 initial_define_key (control_x_map, '>', "scroll-right");
7583 initial_define_key (global_map, Ctl ('V'), "scroll-up");
7584 initial_define_key (meta_map, Ctl ('V'), "scroll-other-window");
7585 initial_define_key (meta_map, 'v', "scroll-down");
7587 initial_define_key (global_map, Ctl('L'), "recenter");
7588 initial_define_key (meta_map, 'r', "move-to-window-line");
7591 /* arch-tag: 90a9c576-0590-48f1-a5f1-6c96a0452d9f
7592 (do not change this comment) */