(top level comment): Updated to reflect the fact that
[emacs.git] / src / window.c
blob2fcf4b97dcd92f71ba0c5c5f8fe4cfea702fa91a
1 /* Window creation, deletion and examination for GNU Emacs.
2 Does not include redisplay.
3 Copyright (C) 1985,86,87,93,94,95,96,97,1998,2000
4 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., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
23 #include <config.h>
24 #include "lisp.h"
25 #include "buffer.h"
26 #include "keyboard.h"
27 #include "frame.h"
28 #include "window.h"
29 #include "commands.h"
30 #include "indent.h"
31 #include "termchar.h"
32 #include "disptab.h"
33 #include "dispextern.h"
34 #include "blockinput.h"
35 #include "intervals.h"
37 #ifdef HAVE_X_WINDOWS
38 #include "xterm.h"
39 #endif /* HAVE_X_WINDOWS */
40 #ifdef WINDOWSNT
41 #include "w32term.h"
42 #endif
43 #ifdef MSDOS
44 #include "msdos.h"
45 #endif
46 #ifdef macintosh
47 #include "macterm.h"
48 #endif
50 #ifndef max
51 #define max(a, b) ((a) < (b) ? (b) : (a))
52 #endif
55 Lisp_Object Qwindowp, Qwindow_live_p, Qwindow_configuration_p;
56 Lisp_Object Qwindow_size_fixed, Qleft_bitmap_area, Qright_bitmap_area;
57 extern Lisp_Object Qheight, Qwidth;
59 static struct window *decode_window P_ ((Lisp_Object));
60 static Lisp_Object select_window_1 P_ ((Lisp_Object, int));
61 static int count_windows P_ ((struct window *));
62 static int get_leaf_windows P_ ((struct window *, struct window **, int));
63 static void window_scroll P_ ((Lisp_Object, int, int, int));
64 static void window_scroll_pixel_based P_ ((Lisp_Object, int, int, int));
65 static void window_scroll_line_based P_ ((Lisp_Object, int, int, int));
66 static int window_min_size_1 P_ ((struct window *, int));
67 static int window_min_size P_ ((struct window *, int, int, int *));
68 static void size_window P_ ((Lisp_Object, int, int, int));
69 static int freeze_window_start P_ ((struct window *, void *));
70 static int window_fixed_size_p P_ ((struct window *, int, int));
71 static void enlarge_window P_ ((Lisp_Object, int, int));
72 static Lisp_Object window_list P_ ((void));
73 static int add_window_to_list P_ ((struct window *, void *));
74 static int candidate_window_p P_ ((Lisp_Object, Lisp_Object, Lisp_Object,
75 Lisp_Object));
76 static Lisp_Object next_window P_ ((Lisp_Object, Lisp_Object,
77 Lisp_Object, int));
78 static void decode_next_window_args P_ ((Lisp_Object *, Lisp_Object *,
79 Lisp_Object *));
80 static int foreach_window_1 P_ ((struct window *,
81 int (* fn) (struct window *, void *),
82 void *));
83 static Lisp_Object window_list_1 P_ ((Lisp_Object, Lisp_Object, Lisp_Object));
85 /* This is the window in which the terminal's cursor should
86 be left when nothing is being done with it. This must
87 always be a leaf window, and its buffer is selected by
88 the top level editing loop at the end of each command.
90 This value is always the same as
91 FRAME_SELECTED_WINDOW (selected_frame). */
93 Lisp_Object selected_window;
95 /* A list of all windows for use by next_window and Fwindow_list.
96 Functions creating or deleting windows should invalidate this cache
97 by setting it to nil. */
99 Lisp_Object Vwindow_list;
101 /* The mini-buffer window of the selected frame.
102 Note that you cannot test for mini-bufferness of an arbitrary window
103 by comparing against this; but you can test for mini-bufferness of
104 the selected window. */
106 Lisp_Object minibuf_window;
108 /* Non-nil means it is the window for C-M-v to scroll
109 when the mini-buffer is selected. */
111 Lisp_Object Vminibuf_scroll_window;
113 /* Non-nil means this is the buffer whose window C-M-v should scroll. */
115 Lisp_Object Vother_window_scroll_buffer;
117 /* Non-nil means it's function to call to display temp buffers. */
119 Lisp_Object Vtemp_buffer_show_function;
121 /* If a window gets smaller than either of these, it is removed. */
123 int window_min_height;
124 int window_min_width;
126 /* Nonzero implies Fdisplay_buffer should create windows. */
128 int pop_up_windows;
130 /* Nonzero implies make new frames for Fdisplay_buffer. */
132 int pop_up_frames;
134 /* Nonzero means reuse existing frames for displaying buffers. */
136 int display_buffer_reuse_frames;
138 /* Non-nil means use this function instead of default */
140 Lisp_Object Vpop_up_frame_function;
142 /* Function to call to handle Fdisplay_buffer. */
144 Lisp_Object Vdisplay_buffer_function;
146 /* Non-nil means that Fdisplay_buffer should even the heights of windows. */
148 Lisp_Object Veven_window_heights;
150 /* List of buffer *names* for buffers that should have their own frames. */
152 Lisp_Object Vspecial_display_buffer_names;
154 /* List of regexps for buffer names that should have their own frames. */
156 Lisp_Object Vspecial_display_regexps;
158 /* Function to pop up a special frame. */
160 Lisp_Object Vspecial_display_function;
162 /* List of buffer *names* for buffers to appear in selected window. */
164 Lisp_Object Vsame_window_buffer_names;
166 /* List of regexps for buffer names to appear in selected window. */
168 Lisp_Object Vsame_window_regexps;
170 /* Hook run at end of temp_output_buffer_show. */
172 Lisp_Object Qtemp_buffer_show_hook;
174 /* Fdisplay_buffer always splits the largest window
175 if that window is more than this high. */
177 int split_height_threshold;
179 /* Number of lines of continuity in scrolling by screenfuls. */
181 int next_screen_context_lines;
183 /* Incremented for each window created. */
185 static int sequence_number;
187 /* Nonzero after init_window_once has finished. */
189 static int window_initialized;
191 /* Hook to run when window config changes. */
193 Lisp_Object Qwindow_configuration_change_hook;
194 Lisp_Object Vwindow_configuration_change_hook;
196 /* Nonzero means scroll commands try to put point
197 at the same screen height as previously. */
199 Lisp_Object Vscroll_preserve_screen_position;
201 #if 0 /* This isn't used anywhere. */
202 /* Nonzero means we can split a frame even if it is "unsplittable". */
203 static int inhibit_frame_unsplittable;
204 #endif /* 0 */
206 #define min(a, b) ((a) < (b) ? (a) : (b))
208 extern int scroll_margin;
210 extern Lisp_Object Qwindow_scroll_functions, Vwindow_scroll_functions;
212 DEFUN ("windowp", Fwindowp, Swindowp, 1, 1, 0,
213 "Returns t if OBJECT is a window.")
214 (object)
215 Lisp_Object object;
217 return WINDOWP (object) ? Qt : Qnil;
220 DEFUN ("window-live-p", Fwindow_live_p, Swindow_live_p, 1, 1, 0,
221 "Returns t if OBJECT is a window which is currently visible.")
222 (object)
223 Lisp_Object object;
225 return (WINDOWP (object) && ! NILP (XWINDOW (object)->buffer) ? Qt : Qnil);
228 Lisp_Object
229 make_window ()
231 Lisp_Object val;
232 register struct window *p;
233 register struct Lisp_Vector *vec;
234 int i;
236 vec = allocate_vectorlike ((EMACS_INT) VECSIZE (struct window));
237 for (i = 0; i < VECSIZE (struct window); i++)
238 vec->contents[i] = Qnil;
239 vec->size = VECSIZE (struct window);
240 p = (struct window *) vec;
241 XSETFASTINT (p->sequence_number, ++sequence_number);
242 XSETFASTINT (p->left, 0);
243 XSETFASTINT (p->top, 0);
244 XSETFASTINT (p->height, 0);
245 XSETFASTINT (p->width, 0);
246 XSETFASTINT (p->hscroll, 0);
247 XSETFASTINT (p->min_hscroll, 0);
248 p->orig_top = p->orig_height = Qnil;
249 p->start = Fmake_marker ();
250 p->pointm = Fmake_marker ();
251 XSETFASTINT (p->use_time, 0);
252 p->frame = Qnil;
253 p->display_table = Qnil;
254 p->dedicated = Qnil;
255 p->pseudo_window_p = 0;
256 bzero (&p->cursor, sizeof (p->cursor));
257 bzero (&p->last_cursor, sizeof (p->last_cursor));
258 bzero (&p->phys_cursor, sizeof (p->phys_cursor));
259 p->desired_matrix = p->current_matrix = 0;
260 p->phys_cursor_type = -1;
261 p->must_be_updated_p = 0;
262 XSETFASTINT (p->window_end_vpos, 0);
263 XSETFASTINT (p->window_end_pos, 0);
264 p->window_end_valid = Qnil;
265 p->vscroll = 0;
266 XSETWINDOW (val, p);
267 XSETFASTINT (p->last_point, 0);
268 p->frozen_window_start_p = 0;
270 Vwindow_list = Qnil;
271 return val;
274 DEFUN ("selected-window", Fselected_window, Sselected_window, 0, 0, 0,
275 "Return the window that the cursor now appears in and commands apply to.")
278 return selected_window;
281 DEFUN ("minibuffer-window", Fminibuffer_window, Sminibuffer_window, 0, 1, 0,
282 "Return the window used now for minibuffers.\n\
283 If the optional argument FRAME is specified, return the minibuffer window\n\
284 used by that frame.")
285 (frame)
286 Lisp_Object frame;
288 if (NILP (frame))
289 frame = selected_frame;
290 CHECK_LIVE_FRAME (frame, 0);
291 return FRAME_MINIBUF_WINDOW (XFRAME (frame));
294 DEFUN ("window-minibuffer-p", Fwindow_minibuffer_p, Swindow_minibuffer_p, 0, 1, 0,
295 "Returns non-nil if WINDOW is a minibuffer window.")
296 (window)
297 Lisp_Object window;
299 struct window *w = decode_window (window);
300 return MINI_WINDOW_P (w) ? Qt : Qnil;
304 DEFUN ("pos-visible-in-window-p", Fpos_visible_in_window_p,
305 Spos_visible_in_window_p, 0, 3, 0,
306 "Return t if position POS is currently on the frame in WINDOW.\n\
307 Return nil if that position is scrolled vertically out of view.\n\
308 If a character is only partially visible, nil is returned, unless the\n\
309 optional argument PARTIALLY is non-nil.\n\
310 POS defaults to point in WINDOW; WINDOW defaults to the selected window.")
311 (pos, window, partially)
312 Lisp_Object pos, window, partially;
314 register struct window *w;
315 register int posint;
316 register struct buffer *buf;
317 struct text_pos top;
318 Lisp_Object in_window;
319 int fully_p;
321 w = decode_window (window);
322 buf = XBUFFER (w->buffer);
323 SET_TEXT_POS_FROM_MARKER (top, w->start);
325 if (!NILP (pos))
327 CHECK_NUMBER_COERCE_MARKER (pos, 0);
328 posint = XINT (pos);
330 else if (w == XWINDOW (selected_window))
331 posint = PT;
332 else
333 posint = XMARKER (w->pointm)->charpos;
335 /* If position is above window start, it's not visible. */
336 if (posint < CHARPOS (top))
337 in_window = Qnil;
338 else if (XFASTINT (w->last_modified) >= BUF_MODIFF (buf)
339 && XFASTINT (w->last_overlay_modified) >= BUF_OVERLAY_MODIFF (buf)
340 && posint < BUF_Z (buf) - XFASTINT (w->window_end_pos))
342 /* If frame is up-to-date, and POSINT is < window end pos, use
343 that info. This doesn't work for POSINT == end pos, because
344 the window end pos is actually the position _after_ the last
345 char in the window. */
346 if (NILP (partially))
348 pos_visible_p (w, posint, &fully_p, NILP (partially));
349 in_window = fully_p ? Qt : Qnil;
351 else
352 in_window = Qt;
354 else if (posint > BUF_ZV (buf))
355 in_window = Qnil;
356 else if (CHARPOS (top) < BUF_BEGV (buf) || CHARPOS (top) > BUF_ZV (buf))
357 /* If window start is out of range, do something reasonable. */
358 in_window = Qnil;
359 else
361 if (pos_visible_p (w, posint, &fully_p, NILP (partially)))
362 in_window = !NILP (partially) || fully_p ? Qt : Qnil;
363 else
364 in_window = Qnil;
367 return in_window;
371 static struct window *
372 decode_window (window)
373 register Lisp_Object window;
375 if (NILP (window))
376 return XWINDOW (selected_window);
378 CHECK_LIVE_WINDOW (window, 0);
379 return XWINDOW (window);
382 DEFUN ("window-buffer", Fwindow_buffer, Swindow_buffer, 0, 1, 0,
383 "Return the buffer that WINDOW is displaying.")
384 (window)
385 Lisp_Object window;
387 return decode_window (window)->buffer;
390 DEFUN ("window-height", Fwindow_height, Swindow_height, 0, 1, 0,
391 "Return the number of lines in WINDOW (including its mode line).")
392 (window)
393 Lisp_Object window;
395 return decode_window (window)->height;
398 DEFUN ("window-width", Fwindow_width, Swindow_width, 0, 1, 0,
399 "Return the number of display columns in WINDOW.\n\
400 This is the width that is usable columns available for text in WINDOW.\n\
401 If you want to find out how many columns WINDOW takes up,\n\
402 use (let ((edges (window-edges))) (- (nth 2 edges) (nth 0 edges))).")
403 (window)
404 Lisp_Object window;
406 return make_number (window_internal_width (decode_window (window)));
409 DEFUN ("window-hscroll", Fwindow_hscroll, Swindow_hscroll, 0, 1, 0,
410 "Return the number of columns by which WINDOW is scrolled from left margin.")
411 (window)
412 Lisp_Object window;
414 return decode_window (window)->hscroll;
417 DEFUN ("set-window-hscroll", Fset_window_hscroll, Sset_window_hscroll, 2, 2, 0,
418 "Set number of columns WINDOW is scrolled from left margin to NCOL.\n\
419 NCOL should be zero or positive.")
420 (window, ncol)
421 Lisp_Object window, ncol;
423 struct window *w = decode_window (window);
424 int hscroll;
426 CHECK_NUMBER (ncol, 1);
427 hscroll = max (0, XINT (ncol));
429 /* Prevent redisplay shortcuts when changing the hscroll. */
430 if (XINT (w->hscroll) != hscroll)
431 XBUFFER (w->buffer)->prevent_redisplay_optimizations_p = 1;
433 w->hscroll = w->min_hscroll = make_number (hscroll);
434 return ncol;
437 DEFUN ("window-redisplay-end-trigger", Fwindow_redisplay_end_trigger,
438 Swindow_redisplay_end_trigger, 0, 1, 0,
439 "Return WINDOW's redisplay end trigger value.\n\
440 See `set-window-redisplay-end-trigger' for more information.")
441 (window)
442 Lisp_Object window;
444 return decode_window (window)->redisplay_end_trigger;
447 DEFUN ("set-window-redisplay-end-trigger", Fset_window_redisplay_end_trigger,
448 Sset_window_redisplay_end_trigger, 2, 2, 0,
449 "Set WINDOW's redisplay end trigger value to VALUE.\n\
450 VALUE should be a buffer position (typically a marker) or nil.\n\
451 If it is a buffer position, then if redisplay in WINDOW reaches a position\n\
452 beyond VALUE, the functions in `redisplay-end-trigger-functions' are called\n\
453 with two arguments: WINDOW, and the end trigger value.\n\
454 Afterwards the end-trigger value is reset to nil.")
455 (window, value)
456 register Lisp_Object window, value;
458 register struct window *w;
460 w = decode_window (window);
461 w->redisplay_end_trigger = value;
462 return value;
465 DEFUN ("window-edges", Fwindow_edges, Swindow_edges, 0, 1, 0,
466 "Return a list of the edge coordinates of WINDOW.\n\
467 \(LEFT TOP RIGHT BOTTOM), all relative to 0, 0 at top left corner of frame.\n\
468 RIGHT is one more than the rightmost column used by WINDOW,\n\
469 and BOTTOM is one more than the bottommost row used by WINDOW\n\
470 and its mode-line.")
471 (window)
472 Lisp_Object window;
474 register struct window *w = decode_window (window);
476 return Fcons (w->left, Fcons (w->top,
477 Fcons (make_number (WINDOW_RIGHT_EDGE (w)),
478 Fcons (make_number (XFASTINT (w->top)
479 + XFASTINT (w->height)),
480 Qnil))));
483 /* Test if the character at column *X, row *Y is within window W.
484 If it is not, return 0;
485 if it is in the window's text area,
486 set *x and *y to its location relative to the upper left corner
487 of the window, and
488 return 1;
489 if it is on the window's modeline, return 2;
490 if it is on the border between the window and its right sibling,
491 return 3.
492 if it is on the window's top line, return 4;
493 if it is in the bitmap area to the left/right of the window,
494 return 5 or 6, and convert *X and *Y to window-relative corrdinates.
496 X and Y are frame relative pixel coordinates. */
498 static int
499 coordinates_in_window (w, x, y)
500 register struct window *w;
501 register int *x, *y;
503 /* Let's make this a global enum later, instead of using numbers
504 everywhere. */
505 enum {ON_NOTHING, ON_TEXT, ON_MODE_LINE, ON_VERTICAL_BORDER,
506 ON_HEADER_LINE, ON_LEFT_FRINGE, ON_RIGHT_FRINGE};
508 struct frame *f = XFRAME (WINDOW_FRAME (w));
509 int left_x, right_x, top_y, bottom_y;
510 int flags_area_width = FRAME_LEFT_FLAGS_AREA_WIDTH (f);
511 int part;
512 int ux = CANON_X_UNIT (f), uy = CANON_Y_UNIT (f);
513 int x0 = XFASTINT (w->left) * ux;
514 int x1 = x0 + XFASTINT (w->width) * ux;
516 if (*x < x0 || *x >= x1)
517 return ON_NOTHING;
519 /* In what's below, we subtract 1 when computing right_x because we
520 want the rightmost pixel, which is given by left_pixel+width-1. */
521 if (w->pseudo_window_p)
523 left_x = 0;
524 right_x = XFASTINT (w->width) * CANON_X_UNIT (f) - 1;
525 top_y = WINDOW_DISPLAY_TOP_EDGE_PIXEL_Y (w);
526 bottom_y = WINDOW_DISPLAY_BOTTOM_EDGE_PIXEL_Y (w);
528 else
530 left_x = (WINDOW_DISPLAY_LEFT_EDGE_PIXEL_X (w)
531 - FRAME_INTERNAL_BORDER_WIDTH_SAFE (f));
532 right_x = WINDOW_DISPLAY_RIGHT_EDGE_PIXEL_X (w) - 1;
533 top_y = (WINDOW_DISPLAY_TOP_EDGE_PIXEL_Y (w)
534 - FRAME_INTERNAL_BORDER_WIDTH_SAFE (f));
535 bottom_y = WINDOW_DISPLAY_BOTTOM_EDGE_PIXEL_Y (w);
538 /* On the mode line or header line? If it's near the start of
539 the mode or header line of window that's has a horizontal
540 sibling, say it's on the vertical line. That's to be able
541 to resize windows horizontally in case we're using toolkit
542 scroll bars. */
544 if (WINDOW_WANTS_MODELINE_P (w)
545 && *y >= bottom_y - CURRENT_MODE_LINE_HEIGHT (w)
546 && *y < bottom_y)
548 /* We're somewhere on the mode line. We consider the place
549 between mode lines of horizontally adjacent mode lines
550 as the vertical border. If scroll bars on the left,
551 return the right window. */
552 part = ON_MODE_LINE;
554 if (FRAME_HAS_VERTICAL_SCROLL_BARS_ON_LEFT (f))
556 if (abs (*x - x0) < ux / 2)
557 part = ON_VERTICAL_BORDER;
559 else if (!WINDOW_RIGHTMOST_P (w) && abs (*x - x1) < ux / 2)
560 part = ON_VERTICAL_BORDER;
562 else if (WINDOW_WANTS_HEADER_LINE_P (w)
563 && *y < top_y + CURRENT_HEADER_LINE_HEIGHT (w)
564 && *y >= top_y)
566 part = ON_HEADER_LINE;
568 if (FRAME_HAS_VERTICAL_SCROLL_BARS_ON_LEFT (f))
570 if (abs (*x - x0) < ux / 2)
571 part = ON_VERTICAL_BORDER;
573 else if (!WINDOW_RIGHTMOST_P (w) && abs (*x - x1) < ux / 2)
574 part = ON_VERTICAL_BORDER;
576 /* Outside anything interesting? */
577 else if (*y < top_y
578 || *y >= bottom_y
579 || *x < (left_x
580 - flags_area_width
581 - FRAME_LEFT_SCROLL_BAR_WIDTH (f) * ux)
582 || *x > right_x + flags_area_width)
584 part = ON_NOTHING;
586 else if (FRAME_WINDOW_P (f))
588 if (!w->pseudo_window_p
589 && !FRAME_HAS_VERTICAL_SCROLL_BARS (f)
590 && !WINDOW_RIGHTMOST_P (w)
591 && (abs (*x - right_x - flags_area_width) < ux / 2))
593 part = ON_VERTICAL_BORDER;
595 else if (*x < left_x || *x > right_x)
597 /* Other lines than the mode line don't include flags areas and
598 scroll bars on the left. */
600 /* Convert X and Y to window-relative pixel coordinates. */
601 *x -= left_x;
602 *y -= top_y;
603 part = *x < left_x ? ON_LEFT_FRINGE : ON_RIGHT_FRINGE;
605 else
607 *x -= left_x;
608 *y -= top_y;
609 part = ON_TEXT;
612 else
614 /* Need to say "*x > right_x" rather than >=, since on character
615 terminals, the vertical line's x coordinate is right_x. */
616 if (*x < left_x || *x > right_x)
618 /* Other lines than the mode line don't include flags areas and
619 scroll bars on the left. */
621 /* Convert X and Y to window-relative pixel coordinates. */
622 *x -= left_x;
623 *y -= top_y;
624 part = *x < left_x ? ON_LEFT_FRINGE : ON_RIGHT_FRINGE;
626 /* Here, too, "*x > right_x" is because of character terminals. */
627 else if (!w->pseudo_window_p
628 && !WINDOW_RIGHTMOST_P (w)
629 && *x > right_x - ux)
631 /* On the border on the right side of the window? Assume that
632 this area begins at RIGHT_X minus a canonical char width. */
633 part = ON_VERTICAL_BORDER;
635 else
637 /* Convert X and Y to window-relative pixel coordinates. */
638 *x -= left_x;
639 *y -= top_y;
640 part = ON_TEXT;
644 return part;
648 DEFUN ("coordinates-in-window-p", Fcoordinates_in_window_p,
649 Scoordinates_in_window_p, 2, 2, 0,
650 "Return non-nil if COORDINATES are in WINDOW.\n\
651 COORDINATES is a cons of the form (X . Y), X and Y being distances\n\
652 measured in characters from the upper-left corner of the frame.\n\
653 (0 . 0) denotes the character in the upper left corner of the\n\
654 frame.\n\
655 If COORDINATES are in the text portion of WINDOW,\n\
656 the coordinates relative to the window are returned.\n\
657 If they are in the mode line of WINDOW, `mode-line' is returned.\n\
658 If they are in the top mode line of WINDOW, `header-line' is returned.\n\
659 If they are in the bitmap-area to the left of the window,\n\
660 `left-bitmap-area' is returned, if they are in the area on the right of\n\
661 the window, `right-bitmap-area' is returned.\n\
662 If they are on the border between WINDOW and its right sibling,\n\
663 `vertical-line' is returned.")
664 (coordinates, window)
665 register Lisp_Object coordinates, window;
667 struct window *w;
668 struct frame *f;
669 int x, y;
670 Lisp_Object lx, ly;
672 CHECK_LIVE_WINDOW (window, 0);
673 w = XWINDOW (window);
674 f = XFRAME (w->frame);
675 CHECK_CONS (coordinates, 1);
676 lx = Fcar (coordinates);
677 ly = Fcdr (coordinates);
678 CHECK_NUMBER_OR_FLOAT (lx, 1);
679 CHECK_NUMBER_OR_FLOAT (ly, 1);
680 x = PIXEL_X_FROM_CANON_X (f, lx);
681 y = PIXEL_Y_FROM_CANON_Y (f, ly);
683 switch (coordinates_in_window (w, &x, &y))
685 case 0: /* NOT in window at all. */
686 return Qnil;
688 case 1: /* In text part of window. */
689 /* X and Y are now window relative pixel coordinates.
690 Convert them to canonical char units before returning
691 them. */
692 return Fcons (CANON_X_FROM_PIXEL_X (f, x),
693 CANON_Y_FROM_PIXEL_Y (f, y));
695 case 2: /* In mode line of window. */
696 return Qmode_line;
698 case 3: /* On right border of window. */
699 return Qvertical_line;
701 case 4:
702 return Qheader_line;
704 case 5:
705 return Qleft_bitmap_area;
707 case 6:
708 return Qright_bitmap_area;
710 default:
711 abort ();
716 /* Callback for foreach_window, used in window_from_coordinates.
717 Check if window W contains coordinates specified by USER_DATA which
718 is actually a pointer to a struct check_window_data CW.
720 Check if window W contains coordinates *CW->x and *CW->y. If it
721 does, return W in *CW->window, as Lisp_Object, and return in
722 *CW->part the part of the window under coordinates *X,*Y. Return
723 zero from this function to stop iterating over windows. */
725 struct check_window_data
727 Lisp_Object *window;
728 int *x, *y, *part;
731 static int
732 check_window_containing (w, user_data)
733 struct window *w;
734 void *user_data;
736 struct check_window_data *cw = (struct check_window_data *) user_data;
737 int found;
739 found = coordinates_in_window (w, cw->x, cw->y);
740 if (found)
742 *cw->part = found - 1;
743 XSETWINDOW (*cw->window, w);
746 return !found;
750 /* Find the window containing frame-relative pixel position X/Y and
751 return it as a Lisp_Object. If X, Y is on the window's modeline,
752 set *PART to 1; if it is on the separating line between the window
753 and its right sibling, set it to 2; otherwise set it to 0. If
754 there is no window under X, Y return nil and leave *PART
755 unmodified. TOOL_BAR_P non-zero means detect tool-bar windows.
757 This function was previously implemented with a loop cycling over
758 windows with Fnext_window, and starting with the frame's selected
759 window. It turned out that this doesn't work with an
760 implementation of next_window using Vwindow_list, because
761 FRAME_SELECTED_WINDOW (F) is not always contained in the window
762 tree of F when this function is called asynchronously from
763 note_mouse_highlight. The original loop didn't terminate in this
764 case. */
766 Lisp_Object
767 window_from_coordinates (f, x, y, part, tool_bar_p)
768 struct frame *f;
769 int x, y;
770 int *part;
771 int tool_bar_p;
773 Lisp_Object window;
774 struct check_window_data cw;
776 window = Qnil;
777 cw.window = &window, cw.x = &x, cw.y = &y; cw.part = part;
778 foreach_window (f, check_window_containing, &cw);
780 /* If not found above, see if it's in the tool bar window, if a tool
781 bar exists. */
782 if (NILP (window)
783 && tool_bar_p
784 && WINDOWP (f->tool_bar_window)
785 && XINT (XWINDOW (f->tool_bar_window)->height) > 0
786 && coordinates_in_window (XWINDOW (f->tool_bar_window), &x, &y))
788 *part = 0;
789 window = f->tool_bar_window;
792 return window;
795 DEFUN ("window-at", Fwindow_at, Swindow_at, 2, 3, 0,
796 "Return window containing coordinates X and Y on FRAME.\n\
797 If omitted, FRAME defaults to the currently selected frame.\n\
798 The top left corner of the frame is considered to be row 0,\n\
799 column 0.")
800 (x, y, frame)
801 Lisp_Object x, y, frame;
803 int part;
804 struct frame *f;
806 if (NILP (frame))
807 frame = selected_frame;
808 CHECK_LIVE_FRAME (frame, 2);
809 f = XFRAME (frame);
811 /* Check that arguments are integers or floats. */
812 CHECK_NUMBER_OR_FLOAT (x, 0);
813 CHECK_NUMBER_OR_FLOAT (y, 1);
815 return window_from_coordinates (f,
816 PIXEL_X_FROM_CANON_X (f, x),
817 PIXEL_Y_FROM_CANON_Y (f, y),
818 &part, 0);
821 DEFUN ("window-point", Fwindow_point, Swindow_point, 0, 1, 0,
822 "Return current value of point in WINDOW.\n\
823 For a nonselected window, this is the value point would have\n\
824 if that window were selected.\n\
826 Note that, when WINDOW is the selected window and its buffer\n\
827 is also currently selected, the value returned is the same as (point).\n\
828 It would be more strictly correct to return the `top-level' value\n\
829 of point, outside of any save-excursion forms.\n\
830 But that is hard to define.")
831 (window)
832 Lisp_Object window;
834 register struct window *w = decode_window (window);
836 if (w == XWINDOW (selected_window)
837 && current_buffer == XBUFFER (w->buffer))
838 return Fpoint ();
839 return Fmarker_position (w->pointm);
842 DEFUN ("window-start", Fwindow_start, Swindow_start, 0, 1, 0,
843 "Return position at which display currently starts in WINDOW.\n\
844 This is updated by redisplay or by calling `set-window-start'.")
845 (window)
846 Lisp_Object window;
848 return Fmarker_position (decode_window (window)->start);
851 /* This is text temporarily removed from the doc string below.
853 This function returns nil if the position is not currently known.\n\
854 That happens when redisplay is preempted and doesn't finish.\n\
855 If in that case you want to compute where the end of the window would\n\
856 have been if redisplay had finished, do this:\n\
857 (save-excursion\n\
858 (goto-char (window-start window))\n\
859 (vertical-motion (1- (window-height window)) window)\n\
860 (point))") */
862 DEFUN ("window-end", Fwindow_end, Swindow_end, 0, 2, 0,
863 "Return position at which display currently ends in WINDOW.\n\
864 This is updated by redisplay, when it runs to completion.\n\
865 Simply changing the buffer text or setting `window-start'\n\
866 does not update this value.\n\
867 If UP-TO-DATE is non-nil, compute the up-to-date position\n\
868 if it isn't already recorded.")
869 (window, update)
870 Lisp_Object window, update;
872 Lisp_Object value;
873 struct window *w = decode_window (window);
874 Lisp_Object buf;
876 buf = w->buffer;
877 CHECK_BUFFER (buf, 0);
879 #if 0 /* This change broke some things. We should make it later. */
880 /* If we don't know the end position, return nil.
881 The user can compute it with vertical-motion if he wants to.
882 It would be nicer to do it automatically,
883 but that's so slow that it would probably bother people. */
884 if (NILP (w->window_end_valid))
885 return Qnil;
886 #endif
888 if (! NILP (update)
889 && ! (! NILP (w->window_end_valid)
890 && XFASTINT (w->last_modified) >= MODIFF))
892 struct text_pos startp;
893 struct it it;
895 /* In case W->start is out of the range, use something
896 reasonable. This situation occured when loading a file with
897 `-l' containing a call to `rmail' with subsequent other
898 commands. At the end, W->start happened to be BEG, while
899 rmail had already narrowed the buffer. */
900 if (XMARKER (w->start)->charpos < BEGV)
901 SET_TEXT_POS (startp, BEGV, BEGV_BYTE);
902 else if (XMARKER (w->start)->charpos > ZV)
903 SET_TEXT_POS (startp, ZV, ZV_BYTE);
904 else
905 SET_TEXT_POS_FROM_MARKER (startp, w->start);
907 /* Cannot use Fvertical_motion because that function doesn't
908 cope with variable-height lines. */
909 start_display (&it, w, startp);
910 move_it_vertically (&it, window_box_height (w));
911 value = make_number (IT_CHARPOS (it));
913 else
914 XSETINT (value, BUF_Z (XBUFFER (buf)) - XFASTINT (w->window_end_pos));
916 return value;
919 DEFUN ("set-window-point", Fset_window_point, Sset_window_point, 2, 2, 0,
920 "Make point value in WINDOW be at position POS in WINDOW's buffer.")
921 (window, pos)
922 Lisp_Object window, pos;
924 register struct window *w = decode_window (window);
926 CHECK_NUMBER_COERCE_MARKER (pos, 1);
927 if (w == XWINDOW (selected_window)
928 && XBUFFER (w->buffer) == current_buffer)
929 Fgoto_char (pos);
930 else
931 set_marker_restricted (w->pointm, pos, w->buffer);
933 /* We have to make sure that redisplay updates the window to show
934 the new value of point. */
935 if (!EQ (window, selected_window))
936 ++windows_or_buffers_changed;
938 return pos;
941 DEFUN ("set-window-start", Fset_window_start, Sset_window_start, 2, 3, 0,
942 "Make display in WINDOW start at position POS in WINDOW's buffer.\n\
943 Optional third arg NOFORCE non-nil inhibits next redisplay\n\
944 from overriding motion of point in order to display at this exact start.")
945 (window, pos, noforce)
946 Lisp_Object window, pos, noforce;
948 register struct window *w = decode_window (window);
950 CHECK_NUMBER_COERCE_MARKER (pos, 1);
951 set_marker_restricted (w->start, pos, w->buffer);
952 /* this is not right, but much easier than doing what is right. */
953 w->start_at_line_beg = Qnil;
954 if (NILP (noforce))
955 w->force_start = Qt;
956 w->update_mode_line = Qt;
957 XSETFASTINT (w->last_modified, 0);
958 XSETFASTINT (w->last_overlay_modified, 0);
959 if (!EQ (window, selected_window))
960 windows_or_buffers_changed++;
962 return pos;
965 DEFUN ("window-dedicated-p", Fwindow_dedicated_p, Swindow_dedicated_p,
966 1, 1, 0,
967 "Return WINDOW's dedicated object, usually t or nil.\n\
968 See also `set-window-dedicated-p'.")
969 (window)
970 Lisp_Object window;
972 return decode_window (window)->dedicated;
975 DEFUN ("set-window-dedicated-p", Fset_window_dedicated_p,
976 Sset_window_dedicated_p, 2, 2, 0,
977 "Control whether WINDOW is dedicated to the buffer it displays.\n\
978 If it is dedicated, Emacs will not automatically change\n\
979 which buffer appears in it.\n\
980 The second argument is the new value for the dedication flag;\n\
981 non-nil means yes.")
982 (window, arg)
983 Lisp_Object window, arg;
985 register struct window *w = decode_window (window);
987 if (NILP (arg))
988 w->dedicated = Qnil;
989 else
990 w->dedicated = Qt;
992 return w->dedicated;
995 DEFUN ("window-display-table", Fwindow_display_table, Swindow_display_table,
996 0, 1, 0,
997 "Return the display-table that WINDOW is using.")
998 (window)
999 Lisp_Object window;
1001 return decode_window (window)->display_table;
1004 /* Get the display table for use on window W. This is either W's
1005 display table or W's buffer's display table. Ignore the specified
1006 tables if they are not valid; if no valid table is specified,
1007 return 0. */
1009 struct Lisp_Char_Table *
1010 window_display_table (w)
1011 struct window *w;
1013 struct Lisp_Char_Table *dp = NULL;
1015 if (DISP_TABLE_P (w->display_table))
1016 dp = XCHAR_TABLE (w->display_table);
1017 else if (BUFFERP (w->buffer))
1019 struct buffer *b = XBUFFER (w->buffer);
1021 if (DISP_TABLE_P (b->display_table))
1022 dp = XCHAR_TABLE (b->display_table);
1023 else if (DISP_TABLE_P (Vstandard_display_table))
1024 dp = XCHAR_TABLE (Vstandard_display_table);
1027 return dp;
1030 DEFUN ("set-window-display-table", Fset_window_display_table, Sset_window_display_table, 2, 2, 0,
1031 "Set WINDOW's display-table to TABLE.")
1032 (window, table)
1033 register Lisp_Object window, table;
1035 register struct window *w;
1037 w = decode_window (window);
1038 w->display_table = table;
1039 return table;
1042 /* Record info on buffer window w is displaying
1043 when it is about to cease to display that buffer. */
1044 static void
1045 unshow_buffer (w)
1046 register struct window *w;
1048 Lisp_Object buf;
1049 struct buffer *b;
1051 buf = w->buffer;
1052 b = XBUFFER (buf);
1053 if (b != XMARKER (w->pointm)->buffer)
1054 abort ();
1056 #if 0
1057 if (w == XWINDOW (selected_window)
1058 || ! EQ (buf, XWINDOW (selected_window)->buffer))
1059 /* Do this except when the selected window's buffer
1060 is being removed from some other window. */
1061 #endif
1062 /* last_window_start records the start position that this buffer
1063 had in the last window to be disconnected from it.
1064 Now that this statement is unconditional,
1065 it is possible for the buffer to be displayed in the
1066 selected window, while last_window_start reflects another
1067 window which was recently showing the same buffer.
1068 Some people might say that might be a good thing. Let's see. */
1069 b->last_window_start = marker_position (w->start);
1071 /* Point in the selected window's buffer
1072 is actually stored in that buffer, and the window's pointm isn't used.
1073 So don't clobber point in that buffer. */
1074 if (! EQ (buf, XWINDOW (selected_window)->buffer)
1075 /* This line helps to fix Horsley's testbug.el bug. */
1076 && !(WINDOWP (b->last_selected_window)
1077 && w != XWINDOW (b->last_selected_window)
1078 && EQ (buf, XWINDOW (b->last_selected_window)->buffer)))
1079 temp_set_point_both (b,
1080 clip_to_bounds (BUF_BEGV (b),
1081 XMARKER (w->pointm)->charpos,
1082 BUF_ZV (b)),
1083 clip_to_bounds (BUF_BEGV_BYTE (b),
1084 marker_byte_position (w->pointm),
1085 BUF_ZV_BYTE (b)));
1087 if (WINDOWP (b->last_selected_window)
1088 && w == XWINDOW (b->last_selected_window))
1089 b->last_selected_window = Qnil;
1092 /* Put replacement into the window structure in place of old. */
1093 static void
1094 replace_window (old, replacement)
1095 Lisp_Object old, replacement;
1097 register Lisp_Object tem;
1098 register struct window *o = XWINDOW (old), *p = XWINDOW (replacement);
1100 /* If OLD is its frame's root_window, then replacement is the new
1101 root_window for that frame. */
1103 if (EQ (old, FRAME_ROOT_WINDOW (XFRAME (o->frame))))
1104 FRAME_ROOT_WINDOW (XFRAME (o->frame)) = replacement;
1106 p->left = o->left;
1107 p->top = o->top;
1108 p->width = o->width;
1109 p->height = o->height;
1110 p->desired_matrix = p->current_matrix = 0;
1111 p->vscroll = 0;
1112 bzero (&p->cursor, sizeof (p->cursor));
1113 bzero (&p->last_cursor, sizeof (p->last_cursor));
1114 bzero (&p->phys_cursor, sizeof (p->phys_cursor));
1115 p->phys_cursor_type = -1;
1116 p->must_be_updated_p = 0;
1117 p->pseudo_window_p = 0;
1118 XSETFASTINT (p->window_end_vpos, 0);
1119 XSETFASTINT (p->window_end_pos, 0);
1120 p->window_end_valid = Qnil;
1121 p->frozen_window_start_p = 0;
1122 p->orig_top = p->orig_height = Qnil;
1124 p->next = tem = o->next;
1125 if (!NILP (tem))
1126 XWINDOW (tem)->prev = replacement;
1128 p->prev = tem = o->prev;
1129 if (!NILP (tem))
1130 XWINDOW (tem)->next = replacement;
1132 p->parent = tem = o->parent;
1133 if (!NILP (tem))
1135 if (EQ (XWINDOW (tem)->vchild, old))
1136 XWINDOW (tem)->vchild = replacement;
1137 if (EQ (XWINDOW (tem)->hchild, old))
1138 XWINDOW (tem)->hchild = replacement;
1141 /*** Here, if replacement is a vertical combination
1142 and so is its new parent, we should make replacement's
1143 children be children of that parent instead. ***/
1146 DEFUN ("delete-window", Fdelete_window, Sdelete_window, 0, 1, "",
1147 "Remove WINDOW from the display. Default is selected window.")
1148 (window)
1149 register Lisp_Object window;
1151 delete_window (window);
1153 if (! NILP (Vwindow_configuration_change_hook)
1154 && ! NILP (Vrun_hooks))
1155 call1 (Vrun_hooks, Qwindow_configuration_change_hook);
1157 return Qnil;
1160 void
1161 delete_window (window)
1162 register Lisp_Object window;
1164 register Lisp_Object tem, parent, sib;
1165 register struct window *p;
1166 register struct window *par;
1167 struct frame *f;
1169 /* Because this function is called by other C code on non-leaf
1170 windows, the CHECK_LIVE_WINDOW macro would choke inappropriately,
1171 so we can't decode_window here. */
1172 if (NILP (window))
1173 window = selected_window;
1174 else
1175 CHECK_WINDOW (window, 0);
1176 p = XWINDOW (window);
1178 /* It's okay to delete an already-deleted window. */
1179 if (NILP (p->buffer)
1180 && NILP (p->hchild)
1181 && NILP (p->vchild))
1182 return;
1184 parent = p->parent;
1185 if (NILP (parent))
1186 error ("Attempt to delete minibuffer or sole ordinary window");
1187 par = XWINDOW (parent);
1189 windows_or_buffers_changed++;
1190 Vwindow_list = Qnil;
1191 f = XFRAME (WINDOW_FRAME (p));
1192 FRAME_WINDOW_SIZES_CHANGED (f) = 1;
1194 /* Are we trying to delete any frame's selected window? */
1196 Lisp_Object pwindow;
1198 /* See if the frame's selected window is either WINDOW
1199 or any subwindow of it, by finding all that window's parents
1200 and comparing each one with WINDOW. */
1201 pwindow = FRAME_SELECTED_WINDOW (f);
1203 while (!NILP (pwindow))
1205 if (EQ (window, pwindow))
1206 break;
1207 pwindow = XWINDOW (pwindow)->parent;
1210 if (EQ (window, pwindow))
1212 Lisp_Object alternative;
1213 alternative = Fnext_window (window, Qlambda, Qnil);
1215 /* If we're about to delete the selected window on the
1216 selected frame, then we should use Fselect_window to select
1217 the new window. On the other hand, if we're about to
1218 delete the selected window on any other frame, we shouldn't do
1219 anything but set the frame's selected_window slot. */
1220 if (EQ (window, selected_window))
1221 Fselect_window (alternative);
1222 else
1223 FRAME_SELECTED_WINDOW (f) = alternative;
1227 tem = p->buffer;
1228 /* tem is null for dummy parent windows
1229 (which have inferiors but not any contents themselves) */
1230 if (!NILP (tem))
1232 unshow_buffer (p);
1233 unchain_marker (p->pointm);
1234 unchain_marker (p->start);
1237 /* Free window glyph matrices. It is sure that they are allocated
1238 again when ADJUST_GLYPHS is called. Block input so that expose
1239 events and other events that access glyph matrices are not
1240 processed while we are changing them. */
1241 BLOCK_INPUT;
1242 free_window_matrices (XWINDOW (FRAME_ROOT_WINDOW (f)));
1244 tem = p->next;
1245 if (!NILP (tem))
1246 XWINDOW (tem)->prev = p->prev;
1248 tem = p->prev;
1249 if (!NILP (tem))
1250 XWINDOW (tem)->next = p->next;
1252 if (EQ (window, par->hchild))
1253 par->hchild = p->next;
1254 if (EQ (window, par->vchild))
1255 par->vchild = p->next;
1257 /* Find one of our siblings to give our space to. */
1258 sib = p->prev;
1259 if (NILP (sib))
1261 /* If p gives its space to its next sibling, that sibling needs
1262 to have its top/left side pulled back to where p's is.
1263 set_window_{height,width} will re-position the sibling's
1264 children. */
1265 sib = p->next;
1266 XWINDOW (sib)->top = p->top;
1267 XWINDOW (sib)->left = p->left;
1270 /* Stretch that sibling. */
1271 if (!NILP (par->vchild))
1272 set_window_height (sib,
1273 XFASTINT (XWINDOW (sib)->height) + XFASTINT (p->height),
1275 if (!NILP (par->hchild))
1276 set_window_width (sib,
1277 XFASTINT (XWINDOW (sib)->width) + XFASTINT (p->width),
1280 /* If parent now has only one child,
1281 put the child into the parent's place. */
1282 tem = par->hchild;
1283 if (NILP (tem))
1284 tem = par->vchild;
1285 if (NILP (XWINDOW (tem)->next))
1286 replace_window (parent, tem);
1288 /* Since we may be deleting combination windows, we must make sure that
1289 not only p but all its children have been marked as deleted. */
1290 if (! NILP (p->hchild))
1291 delete_all_subwindows (XWINDOW (p->hchild));
1292 else if (! NILP (p->vchild))
1293 delete_all_subwindows (XWINDOW (p->vchild));
1295 /* Mark this window as deleted. */
1296 p->buffer = p->hchild = p->vchild = Qnil;
1298 /* Adjust glyph matrices. */
1299 adjust_glyphs (f);
1300 UNBLOCK_INPUT;
1305 /***********************************************************************
1306 Window List
1307 ***********************************************************************/
1309 /* Add window W to *USER_DATA. USER_DATA is actually a Lisp_Object
1310 pointer. This is a callback function for foreach_window, used in
1311 function window_list. */
1313 static int
1314 add_window_to_list (w, user_data)
1315 struct window *w;
1316 void *user_data;
1318 Lisp_Object *list = (Lisp_Object *) user_data;
1319 Lisp_Object window;
1320 XSETWINDOW (window, w);
1321 *list = Fcons (window, *list);
1322 return 1;
1326 /* Return a list of all windows, for use by next_window. If
1327 Vwindow_list is a list, return that list. Otherwise, build a new
1328 list, cache it in Vwindow_list, and return that. */
1330 static Lisp_Object
1331 window_list ()
1333 if (!CONSP (Vwindow_list))
1335 Lisp_Object tail;
1337 Vwindow_list = Qnil;
1338 for (tail = Vframe_list; CONSP (tail); tail = XCDR (tail))
1340 Lisp_Object args[2];
1342 /* We are visiting windows in canonical order, and add
1343 new windows at the front of args[1], which means we
1344 have to reverse this list at the end. */
1345 args[1] = Qnil;
1346 foreach_window (XFRAME (XCAR (tail)), add_window_to_list, &args[1]);
1347 args[0] = Vwindow_list;
1348 args[1] = Fnreverse (args[1]);
1349 Vwindow_list = Fnconc (2, args);
1353 return Vwindow_list;
1357 /* Value is non-zero if WINDOW satisfies the constraints given by
1358 OWINDOW, MINIBUF and ALL_FRAMES.
1360 MINIBUF t means WINDOW may be minibuffer windows.
1361 `lambda' means WINDOW may not be a minibuffer window.
1362 a window means a specific minibuffer window
1364 ALL_FRAMES t means search all frames,
1365 nil means search just current frame,
1366 `visible' means search just visible frames,
1367 0 means search visible and iconified frames,
1368 a window means search the frame that window belongs to,
1369 a frame means consider windows on that frame, only. */
1371 static int
1372 candidate_window_p (window, owindow, minibuf, all_frames)
1373 Lisp_Object window, owindow, minibuf, all_frames;
1375 struct window *w = XWINDOW (window);
1376 struct frame *f = XFRAME (w->frame);
1377 int candidate_p = 1;
1379 if (!BUFFERP (w->buffer))
1380 candidate_p = 0;
1381 else if (MINI_WINDOW_P (w)
1382 && (EQ (minibuf, Qlambda)
1383 || (WINDOWP (minibuf) && !EQ (minibuf, window))))
1385 /* If MINIBUF is `lambda' don't consider any mini-windows.
1386 If it is a window, consider only that one. */
1387 candidate_p = 0;
1389 else if (EQ (all_frames, Qt))
1390 candidate_p = 1;
1391 else if (NILP (all_frames))
1393 xassert (WINDOWP (owindow));
1394 candidate_p = EQ (w->frame, XWINDOW (owindow)->frame);
1396 else if (EQ (all_frames, Qvisible))
1398 FRAME_SAMPLE_VISIBILITY (f);
1399 candidate_p = FRAME_VISIBLE_P (f);
1401 else if (INTEGERP (all_frames) && XINT (all_frames) == 0)
1403 FRAME_SAMPLE_VISIBILITY (f);
1404 candidate_p = FRAME_VISIBLE_P (f) || FRAME_ICONIFIED_P (f);
1406 else if (WINDOWP (all_frames))
1407 candidate_p = (EQ (FRAME_MINIBUF_WINDOW (f), all_frames)
1408 || EQ (XWINDOW (all_frames)->frame, w->frame)
1409 || EQ (XWINDOW (all_frames)->frame, FRAME_FOCUS_FRAME (f)));
1410 else if (FRAMEP (all_frames))
1411 candidate_p = EQ (all_frames, w->frame);
1413 return candidate_p;
1417 /* Decode arguments as allowed by Fnext_window, Fprevious_window, and
1418 Fwindow_list. See there for the meaning of WINDOW, MINIBUF, and
1419 ALL_FRAMES. */
1421 static void
1422 decode_next_window_args (window, minibuf, all_frames)
1423 Lisp_Object *window, *minibuf, *all_frames;
1425 if (NILP (*window))
1426 *window = selected_window;
1427 else
1428 CHECK_LIVE_WINDOW (*window, 0);
1430 /* MINIBUF nil may or may not include minibuffers. Decide if it
1431 does. */
1432 if (NILP (*minibuf))
1433 *minibuf = minibuf_level ? minibuf_window : Qlambda;
1434 else if (!EQ (*minibuf, Qt))
1435 *minibuf = Qlambda;
1437 /* Now *MINIBUF can be t => count all minibuffer windows, `lambda'
1438 => count none of them, or a specific minibuffer window (the
1439 active one) to count. */
1441 /* ALL_FRAMES nil doesn't specify which frames to include. */
1442 if (NILP (*all_frames))
1443 *all_frames = (!EQ (*minibuf, Qlambda)
1444 ? FRAME_MINIBUF_WINDOW (XFRAME (XWINDOW (*window)->frame))
1445 : Qnil);
1446 else if (EQ (*all_frames, Qvisible))
1448 else if (XFASTINT (*all_frames) == 0)
1450 else if (FRAMEP (*all_frames))
1452 else if (!EQ (*all_frames, Qt))
1453 *all_frames = Qnil;
1455 /* Now *ALL_FRAMES is t meaning search all frames, nil meaning
1456 search just current frame, `visible' meaning search just visible
1457 frames, 0 meaning search visible and iconified frames, or a
1458 window, meaning search the frame that window belongs to, or a
1459 frame, meaning consider windows on that frame, only. */
1463 /* Return the next or previous window of WINDOW in canonical ordering
1464 of windows. NEXT_P non-zero means return the next window. See the
1465 documentation string of next-window for the meaning of MINIBUF and
1466 ALL_FRAMES. */
1468 static Lisp_Object
1469 next_window (window, minibuf, all_frames, next_p)
1470 Lisp_Object window, minibuf, all_frames;
1471 int next_p;
1473 decode_next_window_args (&window, &minibuf, &all_frames);
1475 /* If ALL_FRAMES is a frame, and WINDOW isn't on that frame, just
1476 return the first window on the frame. */
1477 if (FRAMEP (all_frames)
1478 && !EQ (all_frames, XWINDOW (window)->frame))
1479 return Fframe_first_window (all_frames);
1481 if (next_p)
1483 Lisp_Object list;
1485 /* Find WINDOW in the list of all windows. */
1486 list = Fmemq (window, window_list ());
1488 /* Scan forward from WINDOW to the end of the window list. */
1489 if (CONSP (list))
1490 for (list = XCDR (list); CONSP (list); list = XCDR (list))
1491 if (candidate_window_p (XCAR (list), window, minibuf, all_frames))
1492 break;
1494 /* Scan from the start of the window list up to WINDOW. */
1495 if (!CONSP (list))
1496 for (list = Vwindow_list;
1497 CONSP (list) && !EQ (XCAR (list), window);
1498 list = XCDR (list))
1499 if (candidate_window_p (XCAR (list), window, minibuf, all_frames))
1500 break;
1502 if (CONSP (list))
1503 window = XCAR (list);
1505 else
1507 Lisp_Object candidate, list;
1509 /* Scan through the list of windows for candidates. If there are
1510 candidate windows in front of WINDOW, the last one of these
1511 is the one we want. If there are candidates following WINDOW
1512 in the list, again the last one of these is the one we want. */
1513 candidate = Qnil;
1514 for (list = window_list (); CONSP (list); list = XCDR (list))
1516 if (EQ (XCAR (list), window))
1518 if (WINDOWP (candidate))
1519 break;
1521 else if (candidate_window_p (XCAR (list), window, minibuf,
1522 all_frames))
1523 candidate = XCAR (list);
1526 if (WINDOWP (candidate))
1527 window = candidate;
1530 return window;
1534 /* This comment supplies the doc string for `next-window',
1535 for make-docfile to see. We cannot put this in the real DEFUN
1536 due to limits in the Unix cpp.
1538 DEFUN ("next-window", Ffoo, Sfoo, 0, 3, 0,
1539 "Return next window after WINDOW in canonical ordering of windows.\n\
1540 If omitted, WINDOW defaults to the selected window.\n\
1542 Optional second arg MINIBUF t means count the minibuffer window even\n\
1543 if not active. MINIBUF nil or omitted means count the minibuffer iff\n\
1544 it is active. MINIBUF neither t nor nil means not to count the\n\
1545 minibuffer even if it is active.\n\
1547 Several frames may share a single minibuffer; if the minibuffer\n\
1548 counts, all windows on all frames that share that minibuffer count\n\
1549 too. Therefore, `next-window' can be used to iterate through the\n\
1550 set of windows even when the minibuffer is on another frame. If the\n\
1551 minibuffer does not count, only windows from WINDOW's frame count.\n\
1553 Optional third arg ALL-FRAMES t means include windows on all frames.\n\
1554 ALL-FRAMES nil or omitted means cycle within the frames as specified\n\
1555 above. ALL-FRAMES = `visible' means include windows on all visible frames.\n\
1556 ALL-FRAMES = 0 means include windows on all visible and iconified frames.\n\
1557 If ALL-FRAMES is a frame, restrict search to windows on that frame.\n\
1558 Anything else means restrict to WINDOW's frame.\n\
1560 If you use consistent values for MINIBUF and ALL-FRAMES, you can use\n\
1561 `next-window' to iterate through the entire cycle of acceptable\n\
1562 windows, eventually ending up back at the window you started with.\n\
1563 `previous-window' traverses the same cycle, in the reverse order.")
1564 (window, minibuf, all_frames) */
1566 DEFUN ("next-window", Fnext_window, Snext_window, 0, 3, 0,
1568 (window, minibuf, all_frames)
1569 Lisp_Object window, minibuf, all_frames;
1571 return next_window (window, minibuf, all_frames, 1);
1575 /* This comment supplies the doc string for `previous-window',
1576 for make-docfile to see. We cannot put this in the real DEFUN
1577 due to limits in the Unix cpp.
1579 DEFUN ("previous-window", Ffoo, Sfoo, 0, 3, 0,
1580 "Return the window preceding WINDOW in canonical ordering of windows.\n\
1581 If omitted, WINDOW defaults to the selected window.\n\
1583 Optional second arg MINIBUF t means count the minibuffer window even\n\
1584 if not active. MINIBUF nil or omitted means count the minibuffer iff\n\
1585 it is active. MINIBUF neither t nor nil means not to count the\n\
1586 minibuffer even if it is active.\n\
1588 Several frames may share a single minibuffer; if the minibuffer\n\
1589 counts, all windows on all frames that share that minibuffer count\n\
1590 too. Therefore, `previous-window' can be used to iterate through\n\
1591 the set of windows even when the minibuffer is on another frame. If\n\
1592 the minibuffer does not count, only windows from WINDOW's frame count\n\
1594 Optional third arg ALL-FRAMES t means include windows on all frames.\n\
1595 ALL-FRAMES nil or omitted means cycle within the frames as specified\n\
1596 above. ALL-FRAMES = `visible' means include windows on all visible frames.\n\
1597 ALL-FRAMES = 0 means include windows on all visible and iconified frames.\n\
1598 If ALL-FRAMES is a frame, restrict search to windows on that frame.\n\
1599 Anything else means restrict to WINDOW's frame.\n\
1601 If you use consistent values for MINIBUF and ALL-FRAMES, you can use\n\
1602 `previous-window' to iterate through the entire cycle of acceptable\n\
1603 windows, eventually ending up back at the window you started with.\n\
1604 `next-window' traverses the same cycle, in the reverse order.")
1605 (window, minibuf, all_frames) */
1608 DEFUN ("previous-window", Fprevious_window, Sprevious_window, 0, 3, 0,
1610 (window, minibuf, all_frames)
1611 Lisp_Object window, minibuf, all_frames;
1613 return next_window (window, minibuf, all_frames, 0);
1617 DEFUN ("other-window", Fother_window, Sother_window, 1, 2, "p",
1618 "Select the ARG'th different window on this frame.\n\
1619 All windows on current frame are arranged in a cyclic order.\n\
1620 This command selects the window ARG steps away in that order.\n\
1621 A negative ARG moves in the opposite order. If the optional second\n\
1622 argument ALL_FRAMES is non-nil, cycle through all frames.")
1623 (arg, all_frames)
1624 Lisp_Object arg, all_frames;
1626 Lisp_Object window;
1627 int i;
1629 CHECK_NUMBER (arg, 0);
1630 window = selected_window;
1632 for (i = XINT (arg); i > 0; --i)
1633 window = Fnext_window (window, Qnil, all_frames);
1634 for (; i < 0; ++i)
1635 window = Fprevious_window (window, Qnil, all_frames);
1637 Fselect_window (window);
1638 return Qnil;
1642 DEFUN ("window-list", Fwindow_list, Swindow_list, 0, 3, 0,
1643 "Return a list of windows on FRAME, starting with WINDOW.\n\
1644 FRAME nil or omitted means use the selected frame.\n\
1645 WINDOW nil or omitted means use the selected window.\n\
1646 MINIBUF t means include the minibuffer window, even if it isn't active.\n\
1647 MINIBUF nil or omitted means include the minibuffer window only\n\
1648 if it's active.\n\
1649 MINIBUF neither nil nor t means never include the minibuffer window.")
1650 (frame, minibuf, window)
1651 Lisp_Object frame, minibuf, window;
1654 if (NILP (window))
1655 window = selected_window;
1656 if (NILP (frame))
1657 frame = selected_frame;
1659 if (!EQ (frame, XWINDOW (window)->frame))
1660 error ("Window is on a different frame");
1662 return window_list_1 (window, minibuf, frame);
1666 /* Return a list of windows in canonical ordering. Arguments are like
1667 for `next-window'. */
1669 static Lisp_Object
1670 window_list_1 (window, minibuf, all_frames)
1671 Lisp_Object window, minibuf, all_frames;
1673 Lisp_Object tail, list;
1675 decode_next_window_args (&window, &minibuf, &all_frames);
1676 list = Qnil;
1678 for (tail = window_list (); CONSP (tail); tail = XCDR (tail))
1679 if (candidate_window_p (XCAR (tail), window, minibuf, all_frames))
1680 list = Fcons (XCAR (tail), list);
1682 return Fnreverse (list);
1687 /* Look at all windows, performing an operation specified by TYPE
1688 with argument OBJ.
1689 If FRAMES is Qt, look at all frames;
1690 Qnil, look at just the selected frame;
1691 Qvisible, look at visible frames;
1692 a frame, just look at windows on that frame.
1693 If MINI is non-zero, perform the operation on minibuffer windows too.
1696 enum window_loop
1698 WINDOW_LOOP_UNUSED,
1699 GET_BUFFER_WINDOW, /* Arg is buffer */
1700 GET_LRU_WINDOW, /* Arg is t for full-width windows only */
1701 DELETE_OTHER_WINDOWS, /* Arg is window not to delete */
1702 DELETE_BUFFER_WINDOWS, /* Arg is buffer */
1703 GET_LARGEST_WINDOW,
1704 UNSHOW_BUFFER, /* Arg is buffer */
1705 CHECK_ALL_WINDOWS
1708 static Lisp_Object
1709 window_loop (type, obj, mini, frames)
1710 enum window_loop type;
1711 Lisp_Object obj, frames;
1712 int mini;
1714 Lisp_Object window, windows, best_window, frame_arg;
1715 struct frame *f;
1716 struct gcpro gcpro1;
1718 /* If we're only looping through windows on a particular frame,
1719 frame points to that frame. If we're looping through windows
1720 on all frames, frame is 0. */
1721 if (FRAMEP (frames))
1722 f = XFRAME (frames);
1723 else if (NILP (frames))
1724 f = SELECTED_FRAME ();
1725 else
1726 f = NULL;
1728 if (f)
1729 frame_arg = Qlambda;
1730 else if (XFASTINT (frames) == 0)
1731 frame_arg = frames;
1732 else if (EQ (frames, Qvisible))
1733 frame_arg = frames;
1734 else
1735 frame_arg = Qt;
1737 /* frame_arg is Qlambda to stick to one frame,
1738 Qvisible to consider all visible frames,
1739 or Qt otherwise. */
1741 /* Pick a window to start with. */
1742 if (WINDOWP (obj))
1743 window = obj;
1744 else if (f)
1745 window = FRAME_SELECTED_WINDOW (f);
1746 else
1747 window = FRAME_SELECTED_WINDOW (SELECTED_FRAME ());
1749 /* Figure out the last window we're going to mess with. Since
1750 Fnext_window, given the same options, is guaranteed to go in a
1751 ring, we can just use Fprevious_window to find the last one.
1753 We can't just wait until we hit the first window again, because
1754 it might be deleted. */
1756 windows = window_list_1 (window, mini ? Qt : Qnil, frame_arg);
1757 GCPRO1 (windows);
1758 best_window = Qnil;
1760 for (; CONSP (windows); windows = CDR (windows))
1762 struct window *w;
1764 window = XCAR (windows);
1765 w = XWINDOW (window);
1767 /* Note that we do not pay attention here to whether the frame
1768 is visible, since Fwindow_list skips non-visible frames if
1769 that is desired, under the control of frame_arg. */
1770 if (!MINI_WINDOW_P (w)
1771 /* For UNSHOW_BUFFER, we must always consider all windows. */
1772 || type == UNSHOW_BUFFER
1773 || (mini && minibuf_level > 0))
1774 switch (type)
1776 case GET_BUFFER_WINDOW:
1777 if (EQ (w->buffer, obj)
1778 /* Don't find any minibuffer window
1779 except the one that is currently in use. */
1780 && (MINI_WINDOW_P (w)
1781 ? EQ (window, minibuf_window)
1782 : 1))
1784 UNGCPRO;
1785 return window;
1787 break;
1789 case GET_LRU_WINDOW:
1790 /* t as arg means consider only full-width windows */
1791 if (!NILP (obj) && !WINDOW_FULL_WIDTH_P (w))
1792 break;
1793 /* Ignore dedicated windows and minibuffers. */
1794 if (MINI_WINDOW_P (w) || !NILP (w->dedicated))
1795 break;
1796 if (NILP (best_window)
1797 || (XFASTINT (XWINDOW (best_window)->use_time)
1798 > XFASTINT (w->use_time)))
1799 best_window = window;
1800 break;
1802 case DELETE_OTHER_WINDOWS:
1803 if (!EQ (window, obj))
1804 Fdelete_window (window);
1805 break;
1807 case DELETE_BUFFER_WINDOWS:
1808 if (EQ (w->buffer, obj))
1810 struct frame *f = XFRAME (WINDOW_FRAME (w));
1812 /* If this window is dedicated, and in a frame of its own,
1813 kill the frame. */
1814 if (EQ (window, FRAME_ROOT_WINDOW (f))
1815 && !NILP (w->dedicated)
1816 && other_visible_frames (f))
1818 /* Skip the other windows on this frame.
1819 There might be one, the minibuffer! */
1820 while (CONSP (XCDR (windows))
1821 && EQ (XWINDOW (XCAR (windows))->frame,
1822 XWINDOW (XCAR (XCDR (windows)))->frame))
1823 windows = XCDR (windows);
1825 /* Now we can safely delete the frame. */
1826 Fdelete_frame (w->frame, Qnil);
1828 else if (NILP (w->parent))
1830 /* If we're deleting the buffer displayed in the
1831 only window on the frame, find a new buffer to
1832 display there. */
1833 Lisp_Object buffer;
1834 buffer = Fother_buffer (obj, Qnil, w->frame);
1835 if (NILP (buffer))
1836 buffer = Fget_buffer_create (build_string ("*scratch*"));
1837 Fset_window_buffer (window, buffer);
1838 if (EQ (window, selected_window))
1839 Fset_buffer (w->buffer);
1841 else
1842 Fdelete_window (window);
1844 break;
1846 case GET_LARGEST_WINDOW:
1848 /* Ignore dedicated windows and minibuffers. */
1849 if (MINI_WINDOW_P (w) || !NILP (w->dedicated))
1850 break;
1852 if (NILP (best_window))
1853 best_window = window;
1854 else
1856 struct window *b = XWINDOW (best_window);
1857 if (XFASTINT (w->height) * XFASTINT (w->width)
1858 > XFASTINT (b->height) * XFASTINT (b->width))
1859 best_window = window;
1862 break;
1864 case UNSHOW_BUFFER:
1865 if (EQ (w->buffer, obj))
1867 Lisp_Object buffer;
1868 struct frame *f = XFRAME (w->frame);
1870 /* Find another buffer to show in this window. */
1871 buffer = Fother_buffer (obj, Qnil, w->frame);
1872 if (NILP (buffer))
1873 buffer = Fget_buffer_create (build_string ("*scratch*"));
1875 /* If this window is dedicated, and in a frame of its own,
1876 kill the frame. */
1877 if (EQ (window, FRAME_ROOT_WINDOW (f))
1878 && !NILP (w->dedicated)
1879 && other_visible_frames (f))
1881 /* Skip the other windows on this frame.
1882 There might be one, the minibuffer! */
1883 while (CONSP (XCDR (windows))
1884 && EQ (XWINDOW (XCAR (windows))->frame,
1885 XWINDOW (XCAR (XCDR (windows)))->frame))
1886 windows = XCDR (windows);
1888 /* Now we can safely delete the frame. */
1889 Fdelete_frame (w->frame, Qnil);
1891 else
1893 /* Otherwise show a different buffer in the window. */
1894 w->dedicated = Qnil;
1895 Fset_window_buffer (window, buffer);
1896 if (EQ (window, selected_window))
1897 Fset_buffer (w->buffer);
1900 break;
1902 /* Check for a window that has a killed buffer. */
1903 case CHECK_ALL_WINDOWS:
1904 if (! NILP (w->buffer)
1905 && NILP (XBUFFER (w->buffer)->name))
1906 abort ();
1907 break;
1909 case WINDOW_LOOP_UNUSED:
1910 break;
1914 UNGCPRO;
1915 return best_window;
1918 /* Used for debugging. Abort if any window has a dead buffer. */
1920 void
1921 check_all_windows ()
1923 window_loop (CHECK_ALL_WINDOWS, Qnil, 1, Qt);
1926 DEFUN ("get-lru-window", Fget_lru_window, Sget_lru_window, 0, 1, 0,
1927 "Return the window least recently selected or used for display.\n\
1928 If optional argument FRAME is `visible', search all visible frames.\n\
1929 If FRAME is 0, search all visible and iconified frames.\n\
1930 If FRAME is t, search all frames.\n\
1931 If FRAME is nil, search only the selected frame.\n\
1932 If FRAME is a frame, search only that frame.")
1933 (frame)
1934 Lisp_Object frame;
1936 register Lisp_Object w;
1937 /* First try for a window that is full-width */
1938 w = window_loop (GET_LRU_WINDOW, Qt, 0, frame);
1939 if (!NILP (w) && !EQ (w, selected_window))
1940 return w;
1941 /* If none of them, try the rest */
1942 return window_loop (GET_LRU_WINDOW, Qnil, 0, frame);
1945 DEFUN ("get-largest-window", Fget_largest_window, Sget_largest_window, 0, 1, 0,
1946 "Return the largest window in area.\n\
1947 If optional argument FRAME is `visible', search all visible frames.\n\
1948 If FRAME is 0, search all visible and iconified frames.\n\
1949 If FRAME is t, search all frames.\n\
1950 If FRAME is nil, search only the selected frame.\n\
1951 If FRAME is a frame, search only that frame.")
1952 (frame)
1953 Lisp_Object frame;
1955 return window_loop (GET_LARGEST_WINDOW, Qnil, 0,
1956 frame);
1959 DEFUN ("get-buffer-window", Fget_buffer_window, Sget_buffer_window, 1, 2, 0,
1960 "Return a window currently displaying BUFFER, or nil if none.\n\
1961 If optional argument FRAME is `visible', search all visible frames.\n\
1962 If optional argument FRAME is 0, search all visible and iconified frames.\n\
1963 If FRAME is t, search all frames.\n\
1964 If FRAME is nil, search only the selected frame.\n\
1965 If FRAME is a frame, search only that frame.")
1966 (buffer, frame)
1967 Lisp_Object buffer, frame;
1969 buffer = Fget_buffer (buffer);
1970 if (BUFFERP (buffer))
1971 return window_loop (GET_BUFFER_WINDOW, buffer, 1, frame);
1972 else
1973 return Qnil;
1976 DEFUN ("delete-other-windows", Fdelete_other_windows, Sdelete_other_windows,
1977 0, 1, "",
1978 "Make WINDOW (or the selected window) fill its frame.\n\
1979 Only the frame WINDOW is on is affected.\n\
1980 This function tries to reduce display jumps\n\
1981 by keeping the text previously visible in WINDOW\n\
1982 in the same place on the frame. Doing this depends on\n\
1983 the value of (window-start WINDOW), so if calling this function\n\
1984 in a program gives strange scrolling, make sure the window-start\n\
1985 value is reasonable when this function is called.")
1986 (window)
1987 Lisp_Object window;
1989 struct window *w;
1990 int startpos;
1991 int top;
1993 if (NILP (window))
1994 window = selected_window;
1995 else
1996 CHECK_LIVE_WINDOW (window, 0);
1998 w = XWINDOW (window);
2000 startpos = marker_position (w->start);
2001 top = XFASTINT (w->top) - FRAME_TOP_MARGIN (XFRAME (WINDOW_FRAME (w)));
2003 if (MINI_WINDOW_P (w) && top > 0)
2004 error ("Can't expand minibuffer to full frame");
2006 window_loop (DELETE_OTHER_WINDOWS, window, 0, WINDOW_FRAME (w));
2008 /* Try to minimize scrolling, by setting the window start to the point
2009 will cause the text at the old window start to be at the same place
2010 on the frame. But don't try to do this if the window start is
2011 outside the visible portion (as might happen when the display is
2012 not current, due to typeahead). */
2013 if (startpos >= BUF_BEGV (XBUFFER (w->buffer))
2014 && startpos <= BUF_ZV (XBUFFER (w->buffer)))
2016 struct position pos;
2017 struct buffer *obuf = current_buffer;
2019 Fset_buffer (w->buffer);
2020 /* This computation used to temporarily move point, but that can
2021 have unwanted side effects due to text properties. */
2022 pos = *vmotion (startpos, -top, w);
2024 set_marker_both (w->start, w->buffer, pos.bufpos, pos.bytepos);
2025 w->start_at_line_beg = ((pos.bytepos == BEGV_BYTE
2026 || FETCH_BYTE (pos.bytepos - 1) == '\n') ? Qt
2027 : Qnil);
2028 /* We need to do this, so that the window-scroll-functions
2029 get called. */
2030 w->optional_new_start = Qt;
2032 set_buffer_internal (obuf);
2035 return Qnil;
2038 DEFUN ("delete-windows-on", Fdelete_windows_on, Sdelete_windows_on,
2039 1, 2, "bDelete windows on (buffer): ",
2040 "Delete all windows showing BUFFER.\n\
2041 Optional second argument FRAME controls which frames are affected.\n\
2042 If optional argument FRAME is `visible', search all visible frames.\n\
2043 If FRAME is 0, search all visible and iconified frames.\n\
2044 If FRAME is nil, search all frames.\n\
2045 If FRAME is t, search only the selected frame.\n\
2046 If FRAME is a frame, search only that frame.")
2047 (buffer, frame)
2048 Lisp_Object buffer, frame;
2050 /* FRAME uses t and nil to mean the opposite of what window_loop
2051 expects. */
2052 if (NILP (frame))
2053 frame = Qt;
2054 else if (EQ (frame, Qt))
2055 frame = Qnil;
2057 if (!NILP (buffer))
2059 buffer = Fget_buffer (buffer);
2060 CHECK_BUFFER (buffer, 0);
2061 window_loop (DELETE_BUFFER_WINDOWS, buffer, 0, frame);
2064 return Qnil;
2067 DEFUN ("replace-buffer-in-windows", Freplace_buffer_in_windows,
2068 Sreplace_buffer_in_windows,
2069 1, 1, "bReplace buffer in windows: ",
2070 "Replace BUFFER with some other buffer in all windows showing it.")
2071 (buffer)
2072 Lisp_Object buffer;
2074 if (!NILP (buffer))
2076 buffer = Fget_buffer (buffer);
2077 CHECK_BUFFER (buffer, 0);
2078 window_loop (UNSHOW_BUFFER, buffer, 0, Qt);
2080 return Qnil;
2083 /* Replace BUFFER with some other buffer in all windows
2084 of all frames, even those on other keyboards. */
2086 void
2087 replace_buffer_in_all_windows (buffer)
2088 Lisp_Object buffer;
2090 #ifdef MULTI_KBOARD
2091 Lisp_Object tail, frame;
2093 /* A single call to window_loop won't do the job
2094 because it only considers frames on the current keyboard.
2095 So loop manually over frames, and handle each one. */
2096 FOR_EACH_FRAME (tail, frame)
2097 window_loop (UNSHOW_BUFFER, buffer, 1, frame);
2098 #else
2099 window_loop (UNSHOW_BUFFER, buffer, 1, Qt);
2100 #endif
2103 /* Set the height of WINDOW and all its inferiors. */
2105 /* The smallest acceptable dimensions for a window. Anything smaller
2106 might crash Emacs. */
2108 #define MIN_SAFE_WINDOW_WIDTH (2)
2109 #define MIN_SAFE_WINDOW_HEIGHT (2)
2111 /* Make sure that window_min_height and window_min_width are
2112 not too small; if they are, set them to safe minima. */
2114 static void
2115 check_min_window_sizes ()
2117 /* Smaller values might permit a crash. */
2118 if (window_min_width < MIN_SAFE_WINDOW_WIDTH)
2119 window_min_width = MIN_SAFE_WINDOW_WIDTH;
2120 if (window_min_height < MIN_SAFE_WINDOW_HEIGHT)
2121 window_min_height = MIN_SAFE_WINDOW_HEIGHT;
2124 /* If *ROWS or *COLS are too small a size for FRAME, set them to the
2125 minimum allowable size. */
2127 void
2128 check_frame_size (frame, rows, cols)
2129 FRAME_PTR frame;
2130 int *rows, *cols;
2132 /* For height, we have to see:
2133 whether the frame has a minibuffer,
2134 whether it wants a mode line, and
2135 whether it has a menu bar. */
2136 int min_height =
2137 (FRAME_MINIBUF_ONLY_P (frame) ? MIN_SAFE_WINDOW_HEIGHT - 1
2138 : (! FRAME_HAS_MINIBUF_P (frame)) ? MIN_SAFE_WINDOW_HEIGHT
2139 : 2 * MIN_SAFE_WINDOW_HEIGHT - 1);
2141 if (FRAME_TOP_MARGIN (frame) > 0)
2142 min_height += FRAME_TOP_MARGIN (frame);
2144 if (*rows < min_height)
2145 *rows = min_height;
2146 if (*cols < MIN_SAFE_WINDOW_WIDTH)
2147 *cols = MIN_SAFE_WINDOW_WIDTH;
2151 /* Value is non-zero if window W is fixed-size. WIDTH_P non-zero means
2152 check if W's width can be changed, otherwise check W's height.
2153 CHECK_SIBLINGS_P non-zero means check resizablity of WINDOW's
2154 siblings, too. If none of the siblings is resizable, WINDOW isn't
2155 either. */
2157 static int
2158 window_fixed_size_p (w, width_p, check_siblings_p)
2159 struct window *w;
2160 int width_p, check_siblings_p;
2162 int fixed_p;
2163 struct window *c;
2165 if (!NILP (w->hchild))
2167 c = XWINDOW (w->hchild);
2169 if (width_p)
2171 /* A horiz. combination is fixed-width if all of if its
2172 children are. */
2173 while (c && window_fixed_size_p (c, width_p, 0))
2174 c = WINDOWP (c->next) ? XWINDOW (c->next) : NULL;
2175 fixed_p = c == NULL;
2177 else
2179 /* A horiz. combination is fixed-height if one of if its
2180 children is. */
2181 while (c && !window_fixed_size_p (c, width_p, 0))
2182 c = WINDOWP (c->next) ? XWINDOW (c->next) : NULL;
2183 fixed_p = c != NULL;
2186 else if (!NILP (w->vchild))
2188 c = XWINDOW (w->vchild);
2190 if (width_p)
2192 /* A vert. combination is fixed-width if one of if its
2193 children is. */
2194 while (c && !window_fixed_size_p (c, width_p, 0))
2195 c = WINDOWP (c->next) ? XWINDOW (c->next) : NULL;
2196 fixed_p = c != NULL;
2198 else
2200 /* A vert. combination is fixed-height if all of if its
2201 children are. */
2202 while (c && window_fixed_size_p (c, width_p, 0))
2203 c = WINDOWP (c->next) ? XWINDOW (c->next) : NULL;
2204 fixed_p = c == NULL;
2207 else if (BUFFERP (w->buffer))
2209 if (w->height_fixed_p && !width_p)
2210 fixed_p = 1;
2211 else
2213 struct buffer *old = current_buffer;
2214 Lisp_Object val;
2216 current_buffer = XBUFFER (w->buffer);
2217 val = find_symbol_value (Qwindow_size_fixed);
2218 current_buffer = old;
2220 fixed_p = 0;
2221 if (!EQ (val, Qunbound))
2223 fixed_p = !NILP (val);
2225 if (fixed_p
2226 && ((EQ (val, Qheight) && width_p)
2227 || (EQ (val, Qwidth) && !width_p)))
2228 fixed_p = 0;
2232 /* Can't tell if this one is resizable without looking at
2233 siblings. If all siblings are fixed-size this one is too. */
2234 if (!fixed_p && check_siblings_p && WINDOWP (w->parent))
2236 Lisp_Object child;
2238 for (child = w->prev; !NILP (child); child = XWINDOW (child)->prev)
2239 if (!window_fixed_size_p (XWINDOW (child), width_p, 0))
2240 break;
2242 if (NILP (child))
2243 for (child = w->next; !NILP (child); child = XWINDOW (child)->next)
2244 if (!window_fixed_size_p (XWINDOW (child), width_p, 0))
2245 break;
2247 if (NILP (child))
2248 fixed_p = 1;
2251 else
2252 fixed_p = 1;
2254 return fixed_p;
2258 /* Return the minimum size of window W, not taking fixed-width windows
2259 into account. WIDTH_P non-zero means return the minimum width,
2260 otherwise return the minimum height. If W is a combination window,
2261 compute the minimum size from the minimum sizes of W's children. */
2263 static int
2264 window_min_size_1 (w, width_p)
2265 struct window *w;
2266 int width_p;
2268 struct window *c;
2269 int size;
2271 if (!NILP (w->hchild))
2273 c = XWINDOW (w->hchild);
2274 size = 0;
2276 if (width_p)
2278 /* The min width of a horizontal combination is
2279 the sum of the min widths of its children. */
2280 while (c)
2282 size += window_min_size_1 (c, width_p);
2283 c = WINDOWP (c->next) ? XWINDOW (c->next) : NULL;
2286 else
2288 /* The min height a horizontal combination equals
2289 the maximum of all min height of its children. */
2290 while (c)
2292 int min_size = window_min_size_1 (c, width_p);
2293 size = max (min_size, size);
2294 c = WINDOWP (c->next) ? XWINDOW (c->next) : NULL;
2298 else if (!NILP (w->vchild))
2300 c = XWINDOW (w->vchild);
2301 size = 0;
2303 if (width_p)
2305 /* The min width of a vertical combination is
2306 the maximum of the min widths of its children. */
2307 while (c)
2309 int min_size = window_min_size_1 (c, width_p);
2310 size = max (min_size, size);
2311 c = WINDOWP (c->next) ? XWINDOW (c->next) : NULL;
2314 else
2316 /* The min height of a vertical combination equals
2317 the sum of the min height of its children. */
2318 while (c)
2320 size += window_min_size_1 (c, width_p);
2321 c = WINDOWP (c->next) ? XWINDOW (c->next) : NULL;
2325 else
2327 if (width_p)
2328 size = window_min_width;
2329 else
2331 if (MINI_WINDOW_P (w)
2332 || (!WINDOW_WANTS_MODELINE_P (w)
2333 && !WINDOW_WANTS_HEADER_LINE_P (w)))
2334 size = 1;
2335 else
2336 size = window_min_height;
2340 return size;
2344 /* Return the minimum size of window W, taking fixed-size windows into
2345 account. WIDTH_P non-zero means return the minimum width,
2346 otherwise return the minimum height. IGNORE_FIXED_P non-zero means
2347 ignore if W is fixed-size. Set *FIXED to 1 if W is fixed-size
2348 unless FIXED is null. */
2350 static int
2351 window_min_size (w, width_p, ignore_fixed_p, fixed)
2352 struct window *w;
2353 int width_p, ignore_fixed_p, *fixed;
2355 int size, fixed_p;
2357 if (ignore_fixed_p)
2358 fixed_p = 0;
2359 else
2360 fixed_p = window_fixed_size_p (w, width_p, 1);
2362 if (fixed)
2363 *fixed = fixed_p;
2365 if (fixed_p)
2366 size = width_p ? XFASTINT (w->width) : XFASTINT (w->height);
2367 else
2368 size = window_min_size_1 (w, width_p);
2370 return size;
2374 /* Set WINDOW's height or width to SIZE. WIDTH_P non-zero means set
2375 WINDOW's width. Resize WINDOW's children, if any, so that they
2376 keep their proportionate size relative to WINDOW. Propagate
2377 WINDOW's top or left edge position to children. Delete windows
2378 that become too small unless NODELETE_P is non-zero. */
2380 static void
2381 size_window (window, size, width_p, nodelete_p)
2382 Lisp_Object window;
2383 int size, width_p, nodelete_p;
2385 struct window *w = XWINDOW (window);
2386 struct window *c;
2387 Lisp_Object child, *forward, *sideward;
2388 int old_size, min_size;
2390 check_min_window_sizes ();
2391 size = max (0, size);
2393 /* If the window has been "too small" at one point,
2394 don't delete it for being "too small" in the future.
2395 Preserve it as long as that is at all possible. */
2396 if (width_p)
2398 old_size = XINT (w->width);
2399 min_size = window_min_width;
2401 else
2403 old_size = XINT (w->height);
2404 min_size = window_min_height;
2407 if (old_size < window_min_width)
2408 w->too_small_ok = Qt;
2410 /* Maybe delete WINDOW if it's too small. */
2411 if (!nodelete_p && !NILP (w->parent))
2413 int min_size;
2415 if (!MINI_WINDOW_P (w) && !NILP (w->too_small_ok))
2416 min_size = width_p ? MIN_SAFE_WINDOW_WIDTH : MIN_SAFE_WINDOW_HEIGHT;
2417 else
2418 min_size = width_p ? window_min_width : window_min_height;
2420 if (size < min_size)
2422 delete_window (window);
2423 return;
2427 /* Set redisplay hints. */
2428 w->last_modified = make_number (0);
2429 w->last_overlay_modified = make_number (0);
2430 windows_or_buffers_changed++;
2431 FRAME_WINDOW_SIZES_CHANGED (XFRAME (w->frame)) = 1;
2433 if (width_p)
2435 sideward = &w->vchild;
2436 forward = &w->hchild;
2437 w->width = make_number (size);
2439 else
2441 sideward = &w->hchild;
2442 forward = &w->vchild;
2443 w->height = make_number (size);
2446 if (!NILP (*sideward))
2448 for (child = *sideward; !NILP (child); child = c->next)
2450 c = XWINDOW (child);
2451 if (width_p)
2452 c->left = w->left;
2453 else
2454 c->top = w->top;
2455 size_window (child, size, width_p, nodelete_p);
2458 else if (!NILP (*forward))
2460 int fixed_size, each, extra, n;
2461 int resize_fixed_p, nfixed;
2462 int last_pos, first_pos, nchildren, total;
2464 /* Determine the fixed-size portion of the this window, and the
2465 number of child windows. */
2466 fixed_size = nchildren = nfixed = total = 0;
2467 for (child = *forward; !NILP (child); child = c->next, ++nchildren)
2469 int child_size;
2471 c = XWINDOW (child);
2472 child_size = width_p ? XINT (c->width) : XINT (c->height);
2473 total += child_size;
2475 if (window_fixed_size_p (c, width_p, 0))
2477 fixed_size += child_size;
2478 ++nfixed;
2482 /* If the new size is smaller than fixed_size, or if there
2483 aren't any resizable windows, allow resizing fixed-size
2484 windows. */
2485 resize_fixed_p = nfixed == nchildren || size < fixed_size;
2487 /* Compute how many lines/columns to add to each child. The
2488 value of extra takes care of rounding errors. */
2489 n = resize_fixed_p ? nchildren : nchildren - nfixed;
2490 each = (size - total) / n;
2491 extra = (size - total) - n * each;
2493 /* Compute new children heights and edge positions. */
2494 first_pos = width_p ? XINT (w->left) : XINT (w->top);
2495 last_pos = first_pos;
2496 for (child = *forward; !NILP (child); child = c->next)
2498 int new_size, old_size;
2500 c = XWINDOW (child);
2501 old_size = width_p ? XFASTINT (c->width) : XFASTINT (c->height);
2502 new_size = old_size;
2504 /* The top or left edge position of this child equals the
2505 bottom or right edge of its predecessor. */
2506 if (width_p)
2507 c->left = make_number (last_pos);
2508 else
2509 c->top = make_number (last_pos);
2511 /* If this child can be resized, do it. */
2512 if (resize_fixed_p || !window_fixed_size_p (c, width_p, 0))
2514 new_size = old_size + each + extra;
2515 extra = 0;
2518 /* Set new height. Note that size_window also propagates
2519 edge positions to children, so it's not a no-op if we
2520 didn't change the child's size. */
2521 size_window (child, new_size, width_p, 1);
2523 /* Remember the bottom/right edge position of this child; it
2524 will be used to set the top/left edge of the next child. */
2525 last_pos += new_size;
2528 /* We should have covered the parent exactly with child windows. */
2529 xassert (size == last_pos - first_pos);
2531 /* Now delete any children that became too small. */
2532 if (!nodelete_p)
2533 for (child = *forward; !NILP (child); child = c->next)
2535 int child_size;
2536 c = XWINDOW (child);
2537 child_size = width_p ? XINT (c->width) : XINT (c->height);
2538 size_window (child, child_size, width_p, 0);
2543 /* Set WINDOW's height to HEIGHT, and recursively change the height of
2544 WINDOW's children. NODELETE non-zero means don't delete windows
2545 that become too small in the process. (The caller should check
2546 later and do so if appropriate.) */
2548 void
2549 set_window_height (window, height, nodelete)
2550 Lisp_Object window;
2551 int height;
2552 int nodelete;
2554 size_window (window, height, 0, nodelete);
2558 /* Set WINDOW's width to WIDTH, and recursively change the width of
2559 WINDOW's children. NODELETE non-zero means don't delete windows
2560 that become too small in the process. (The caller should check
2561 later and do so if appropriate.) */
2563 void
2564 set_window_width (window, width, nodelete)
2565 Lisp_Object window;
2566 int width;
2567 int nodelete;
2569 size_window (window, width, 1, nodelete);
2573 int window_select_count;
2575 Lisp_Object
2576 Fset_window_buffer_unwind (obuf)
2577 Lisp_Object obuf;
2579 Fset_buffer (obuf);
2580 return Qnil;
2584 /* Make WINDOW display BUFFER as its contents. RUN_HOOKS_P non-zero
2585 means it's allowed to run hooks. See make_frame for a case where
2586 it's not allowed. */
2588 void
2589 set_window_buffer (window, buffer, run_hooks_p)
2590 Lisp_Object window, buffer;
2591 int run_hooks_p;
2593 struct window *w = XWINDOW (window);
2594 struct buffer *b = XBUFFER (buffer);
2595 int count = specpdl_ptr - specpdl;
2597 w->buffer = buffer;
2599 if (EQ (window, selected_window))
2600 b->last_selected_window = window;
2602 /* Update time stamps of buffer display. */
2603 if (INTEGERP (b->display_count))
2604 XSETINT (b->display_count, XINT (b->display_count) + 1);
2605 b->display_time = Fcurrent_time ();
2607 XSETFASTINT (w->window_end_pos, 0);
2608 XSETFASTINT (w->window_end_vpos, 0);
2609 bzero (&w->last_cursor, sizeof w->last_cursor);
2610 w->window_end_valid = Qnil;
2611 XSETFASTINT (w->hscroll, 0);
2612 XSETFASTINT (w->min_hscroll, 0);
2613 set_marker_both (w->pointm, buffer, BUF_PT (b), BUF_PT_BYTE (b));
2614 set_marker_restricted (w->start,
2615 make_number (b->last_window_start),
2616 buffer);
2617 w->start_at_line_beg = Qnil;
2618 w->force_start = Qnil;
2619 XSETFASTINT (w->last_modified, 0);
2620 XSETFASTINT (w->last_overlay_modified, 0);
2621 windows_or_buffers_changed++;
2623 /* We must select BUFFER for running the window-scroll-functions.
2624 If WINDOW is selected, switch permanently.
2625 Otherwise, switch but go back to the ambient buffer afterward. */
2626 if (EQ (window, selected_window))
2627 Fset_buffer (buffer);
2628 /* We can't check ! NILP (Vwindow_scroll_functions) here
2629 because that might itself be a local variable. */
2630 else if (window_initialized)
2632 record_unwind_protect (Fset_window_buffer_unwind, Fcurrent_buffer ());
2633 Fset_buffer (buffer);
2636 /* Set left and right marginal area width from buffer. */
2637 Fset_window_margins (window, b->left_margin_width, b->right_margin_width);
2639 if (run_hooks_p)
2641 if (! NILP (Vwindow_scroll_functions))
2642 run_hook_with_args_2 (Qwindow_scroll_functions, window,
2643 Fmarker_position (w->start));
2645 if (! NILP (Vwindow_configuration_change_hook)
2646 && ! NILP (Vrun_hooks))
2647 call1 (Vrun_hooks, Qwindow_configuration_change_hook);
2650 unbind_to (count, Qnil);
2654 DEFUN ("set-window-buffer", Fset_window_buffer, Sset_window_buffer, 2, 2, 0,
2655 "Make WINDOW display BUFFER as its contents.\n\
2656 BUFFER can be a buffer or buffer name.")
2657 (window, buffer)
2658 register Lisp_Object window, buffer;
2660 register Lisp_Object tem;
2661 register struct window *w = decode_window (window);
2663 XSETWINDOW (window, w);
2664 buffer = Fget_buffer (buffer);
2665 CHECK_BUFFER (buffer, 1);
2667 if (NILP (XBUFFER (buffer)->name))
2668 error ("Attempt to display deleted buffer");
2670 tem = w->buffer;
2671 if (NILP (tem))
2672 error ("Window is deleted");
2673 else if (! EQ (tem, Qt)) /* w->buffer is t when the window
2674 is first being set up. */
2676 if (!NILP (w->dedicated) && !EQ (tem, buffer))
2677 error ("Window is dedicated to `%s'",
2678 XSTRING (XBUFFER (tem)->name)->data);
2680 unshow_buffer (w);
2683 set_window_buffer (window, buffer, 1);
2684 return Qnil;
2687 DEFUN ("select-window", Fselect_window, Sselect_window, 1, 1, 0,
2688 "Select WINDOW. Most editing will apply to WINDOW's buffer.\n\
2689 If WINDOW is not already selected, also make WINDOW's buffer current.\n\
2690 Note that the main editor command loop\n\
2691 selects the buffer of the selected window before each command.")
2692 (window)
2693 register Lisp_Object window;
2695 return select_window_1 (window, 1);
2698 /* Note that selected_window can be nil
2699 when this is called from Fset_window_configuration. */
2701 static Lisp_Object
2702 select_window_1 (window, recordflag)
2703 register Lisp_Object window;
2704 int recordflag;
2706 register struct window *w;
2707 register struct window *ow;
2708 struct frame *sf;
2710 CHECK_LIVE_WINDOW (window, 0);
2712 w = XWINDOW (window);
2714 if (NILP (w->buffer))
2715 error ("Trying to select deleted window or non-leaf window");
2717 XSETFASTINT (w->use_time, ++window_select_count);
2718 if (EQ (window, selected_window))
2719 return window;
2721 if (!NILP (selected_window))
2723 ow = XWINDOW (selected_window);
2724 if (! NILP (ow->buffer))
2725 set_marker_both (ow->pointm, ow->buffer,
2726 BUF_PT (XBUFFER (ow->buffer)),
2727 BUF_PT_BYTE (XBUFFER (ow->buffer)));
2730 selected_window = window;
2731 sf = SELECTED_FRAME ();
2732 if (XFRAME (WINDOW_FRAME (w)) != sf)
2734 XFRAME (WINDOW_FRAME (w))->selected_window = window;
2735 /* Use this rather than Fhandle_switch_frame
2736 so that FRAME_FOCUS_FRAME is moved appropriately as we
2737 move around in the state where a minibuffer in a separate
2738 frame is active. */
2739 Fselect_frame (WINDOW_FRAME (w), Qnil);
2741 else
2742 sf->selected_window = window;
2744 if (recordflag)
2745 record_buffer (w->buffer);
2746 Fset_buffer (w->buffer);
2748 XBUFFER (w->buffer)->last_selected_window = window;
2750 /* Go to the point recorded in the window.
2751 This is important when the buffer is in more
2752 than one window. It also matters when
2753 redisplay_window has altered point after scrolling,
2754 because it makes the change only in the window. */
2756 register int new_point = marker_position (w->pointm);
2757 if (new_point < BEGV)
2758 SET_PT (BEGV);
2759 else if (new_point > ZV)
2760 SET_PT (ZV);
2761 else
2762 SET_PT (new_point);
2765 windows_or_buffers_changed++;
2766 return window;
2769 /* Deiconify the frame containing the window WINDOW,
2770 unless it is the selected frame;
2771 then return WINDOW.
2773 The reason for the exception for the selected frame
2774 is that it seems better not to change the selected frames visibility
2775 merely because of displaying a different buffer in it.
2776 The deiconification is useful when a buffer gets shown in
2777 another frame that you were not using lately. */
2779 static Lisp_Object
2780 display_buffer_1 (window)
2781 Lisp_Object window;
2783 Lisp_Object frame = XWINDOW (window)->frame;
2784 FRAME_PTR f = XFRAME (frame);
2786 FRAME_SAMPLE_VISIBILITY (f);
2788 if (!EQ (frame, selected_frame))
2790 if (FRAME_ICONIFIED_P (f))
2791 Fmake_frame_visible (frame);
2792 else if (FRAME_VISIBLE_P (f))
2793 Fraise_frame (frame);
2796 return window;
2799 DEFUN ("special-display-p", Fspecial_display_p, Sspecial_display_p, 1, 1, 0,
2800 "Returns non-nil if a buffer named BUFFER-NAME would be created specially.\n\
2801 The value is actually t if the frame should be called with default frame\n\
2802 parameters, and a list of frame parameters if they were specified.\n\
2803 See `special-display-buffer-names', and `special-display-regexps'.")
2804 (buffer_name)
2805 Lisp_Object buffer_name;
2807 Lisp_Object tem;
2809 CHECK_STRING (buffer_name, 1);
2811 tem = Fmember (buffer_name, Vspecial_display_buffer_names);
2812 if (!NILP (tem))
2813 return Qt;
2815 tem = Fassoc (buffer_name, Vspecial_display_buffer_names);
2816 if (!NILP (tem))
2817 return XCDR (tem);
2819 for (tem = Vspecial_display_regexps; CONSP (tem); tem = XCDR (tem))
2821 Lisp_Object car = XCAR (tem);
2822 if (STRINGP (car)
2823 && fast_string_match (car, buffer_name) >= 0)
2824 return Qt;
2825 else if (CONSP (car)
2826 && STRINGP (XCAR (car))
2827 && fast_string_match (XCAR (car), buffer_name) >= 0)
2828 return XCDR (car);
2830 return Qnil;
2833 DEFUN ("same-window-p", Fsame_window_p, Ssame_window_p, 1, 1, 0,
2834 "Returns non-nil if a new buffer named BUFFER-NAME would use the same window.\n\
2835 See `same-window-buffer-names' and `same-window-regexps'.")
2836 (buffer_name)
2837 Lisp_Object buffer_name;
2839 Lisp_Object tem;
2841 CHECK_STRING (buffer_name, 1);
2843 tem = Fmember (buffer_name, Vsame_window_buffer_names);
2844 if (!NILP (tem))
2845 return Qt;
2847 tem = Fassoc (buffer_name, Vsame_window_buffer_names);
2848 if (!NILP (tem))
2849 return Qt;
2851 for (tem = Vsame_window_regexps; CONSP (tem); tem = XCDR (tem))
2853 Lisp_Object car = XCAR (tem);
2854 if (STRINGP (car)
2855 && fast_string_match (car, buffer_name) >= 0)
2856 return Qt;
2857 else if (CONSP (car)
2858 && STRINGP (XCAR (car))
2859 && fast_string_match (XCAR (car), buffer_name) >= 0)
2860 return Qt;
2862 return Qnil;
2865 /* Use B so the default is (other-buffer). */
2866 DEFUN ("display-buffer", Fdisplay_buffer, Sdisplay_buffer, 1, 3,
2867 "BDisplay buffer: \nP",
2868 "Make BUFFER appear in some window but don't select it.\n\
2869 BUFFER can be a buffer or a buffer name.\n\
2870 If BUFFER is shown already in some window, just use that one,\n\
2871 unless the window is the selected window and the optional second\n\
2872 argument NOT-THIS-WINDOW is non-nil (interactively, with prefix arg).\n\
2873 If `pop-up-frames' is non-nil, make a new frame if no window shows BUFFER.\n\
2874 Returns the window displaying BUFFER.\n\
2875 If `display-reuse-frames' is non-nil, and another frame is currently\n\
2876 displaying BUFFER, then simply raise that frame.\n\
2878 The variables `special-display-buffer-names', `special-display-regexps',\n\
2879 `same-window-buffer-names', and `same-window-regexps' customize how certain\n\
2880 buffer names are handled.\n\
2882 If optional argument FRAME is `visible', search all visible frames.\n\
2883 If FRAME is 0, search all visible and iconified frames.\n\
2884 If FRAME is t, search all frames.\n\
2885 If FRAME is a frame, search only that frame.\n\
2886 If FRAME is nil, search only the selected frame\n\
2887 (actually the last nonminibuffer frame),\n\
2888 unless `pop-up-frames' or `display-buffer-reuse-frames' is non-nil,\n\
2889 which means search visible and iconified frames.\n\
2891 If `even-window-heights' is non-nil, window heights will be evened out\n\
2892 if displaying the buffer causes two vertically adjacent windows to be\n\
2893 displayed.")
2894 (buffer, not_this_window, frame)
2895 register Lisp_Object buffer, not_this_window, frame;
2897 register Lisp_Object window, tem, swp;
2898 struct frame *f;
2900 swp = Qnil;
2901 buffer = Fget_buffer (buffer);
2902 CHECK_BUFFER (buffer, 0);
2904 if (!NILP (Vdisplay_buffer_function))
2905 return call2 (Vdisplay_buffer_function, buffer, not_this_window);
2907 if (NILP (not_this_window)
2908 && XBUFFER (XWINDOW (selected_window)->buffer) == XBUFFER (buffer))
2909 return display_buffer_1 (selected_window);
2911 /* See if the user has specified this buffer should appear
2912 in the selected window. */
2913 if (NILP (not_this_window))
2915 swp = Fsame_window_p (XBUFFER (buffer)->name);
2916 if (!NILP (swp) && !no_switch_window (selected_window))
2918 Fswitch_to_buffer (buffer, Qnil);
2919 return display_buffer_1 (selected_window);
2923 /* If the user wants pop-up-frames or display-reuse-frames, then
2924 look for a window showing BUFFER on any visible or iconified frame.
2925 Otherwise search only the current frame. */
2926 if (! NILP (frame))
2927 tem = frame;
2928 else if (pop_up_frames
2929 || display_buffer_reuse_frames
2930 || last_nonminibuf_frame == 0)
2931 XSETFASTINT (tem, 0);
2932 else
2933 XSETFRAME (tem, last_nonminibuf_frame);
2935 window = Fget_buffer_window (buffer, tem);
2936 if (!NILP (window)
2937 && (NILP (not_this_window) || !EQ (window, selected_window)))
2938 return display_buffer_1 (window);
2940 /* Certain buffer names get special handling. */
2941 if (!NILP (Vspecial_display_function) && NILP (swp))
2943 tem = Fspecial_display_p (XBUFFER (buffer)->name);
2944 if (EQ (tem, Qt))
2945 return call1 (Vspecial_display_function, buffer);
2946 if (CONSP (tem))
2947 return call2 (Vspecial_display_function, buffer, tem);
2950 /* If there are no frames open that have more than a minibuffer,
2951 we need to create a new frame. */
2952 if (pop_up_frames || last_nonminibuf_frame == 0)
2954 window = Fframe_selected_window (call0 (Vpop_up_frame_function));
2955 Fset_window_buffer (window, buffer);
2956 return display_buffer_1 (window);
2959 f = SELECTED_FRAME ();
2960 if (pop_up_windows
2961 || FRAME_MINIBUF_ONLY_P (f)
2962 /* If the current frame is a special display frame,
2963 don't try to reuse its windows. */
2964 || !NILP (XWINDOW (FRAME_ROOT_WINDOW (f))->dedicated))
2966 Lisp_Object frames;
2968 frames = Qnil;
2969 if (FRAME_MINIBUF_ONLY_P (f))
2970 XSETFRAME (frames, last_nonminibuf_frame);
2971 /* Don't try to create a window if would get an error */
2972 if (split_height_threshold < window_min_height << 1)
2973 split_height_threshold = window_min_height << 1;
2975 /* Note that both Fget_largest_window and Fget_lru_window
2976 ignore minibuffers and dedicated windows.
2977 This means they can return nil. */
2979 /* If the frame we would try to split cannot be split,
2980 try other frames. */
2981 if (FRAME_NO_SPLIT_P (NILP (frames) ? f : last_nonminibuf_frame))
2983 /* Try visible frames first. */
2984 window = Fget_largest_window (Qvisible);
2985 /* If that didn't work, try iconified frames. */
2986 if (NILP (window))
2987 window = Fget_largest_window (make_number (0));
2988 if (NILP (window))
2989 window = Fget_largest_window (Qt);
2991 else
2992 window = Fget_largest_window (frames);
2994 /* If we got a tall enough full-width window that can be split,
2995 split it. */
2996 if (!NILP (window)
2997 && ! FRAME_NO_SPLIT_P (XFRAME (XWINDOW (window)->frame))
2998 && window_height (window) >= split_height_threshold
2999 && WINDOW_FULL_WIDTH_P (XWINDOW (window)))
3000 window = Fsplit_window (window, Qnil, Qnil);
3001 else
3003 Lisp_Object upper, lower, other;
3005 window = Fget_lru_window (frames);
3006 /* If the LRU window is selected, and big enough,
3007 and can be split, split it. */
3008 if (!NILP (window)
3009 && ! FRAME_NO_SPLIT_P (XFRAME (XWINDOW (window)->frame))
3010 && (EQ (window, selected_window)
3011 || EQ (XWINDOW (window)->parent, Qnil))
3012 && window_height (window) >= window_min_height << 1)
3013 window = Fsplit_window (window, Qnil, Qnil);
3014 /* If Fget_lru_window returned nil, try other approaches. */
3016 /* Try visible frames first. */
3017 if (NILP (window))
3018 window = Fget_buffer_window (buffer, Qvisible);
3019 if (NILP (window))
3020 window = Fget_largest_window (Qvisible);
3021 /* If that didn't work, try iconified frames. */
3022 if (NILP (window))
3023 window = Fget_buffer_window (buffer, make_number (0));
3024 if (NILP (window))
3025 window = Fget_largest_window (make_number (0));
3026 /* Try invisible frames. */
3027 if (NILP (window))
3028 window = Fget_buffer_window (buffer, Qt);
3029 if (NILP (window))
3030 window = Fget_largest_window (Qt);
3031 /* As a last resort, make a new frame. */
3032 if (NILP (window))
3033 window = Fframe_selected_window (call0 (Vpop_up_frame_function));
3034 /* If window appears above or below another,
3035 even out their heights. */
3036 other = upper = lower = Qnil;
3037 if (!NILP (XWINDOW (window)->prev))
3038 other = upper = XWINDOW (window)->prev, lower = window;
3039 if (!NILP (XWINDOW (window)->next))
3040 other = lower = XWINDOW (window)->next, upper = window;
3041 if (!NILP (other)
3042 && !NILP (Veven_window_heights)
3043 /* Check that OTHER and WINDOW are vertically arrayed. */
3044 && !EQ (XWINDOW (other)->top, XWINDOW (window)->top)
3045 && (XFASTINT (XWINDOW (other)->height)
3046 > XFASTINT (XWINDOW (window)->height)))
3048 int total = (XFASTINT (XWINDOW (other)->height)
3049 + XFASTINT (XWINDOW (window)->height));
3050 enlarge_window (upper,
3051 total / 2 - XFASTINT (XWINDOW (upper)->height),
3056 else
3057 window = Fget_lru_window (Qnil);
3059 Fset_window_buffer (window, buffer);
3060 return display_buffer_1 (window);
3063 void
3064 temp_output_buffer_show (buf)
3065 register Lisp_Object buf;
3067 register struct buffer *old = current_buffer;
3068 register Lisp_Object window;
3069 register struct window *w;
3071 XBUFFER (buf)->directory = current_buffer->directory;
3073 Fset_buffer (buf);
3074 BUF_SAVE_MODIFF (XBUFFER (buf)) = MODIFF;
3075 BEGV = BEG;
3076 ZV = Z;
3077 SET_PT (BEG);
3078 XBUFFER (buf)->prevent_redisplay_optimizations_p = 1;
3079 set_buffer_internal (old);
3081 if (!EQ (Vtemp_buffer_show_function, Qnil))
3082 call1 (Vtemp_buffer_show_function, buf);
3083 else
3085 window = Fdisplay_buffer (buf, Qnil, Qnil);
3087 if (!EQ (XWINDOW (window)->frame, selected_frame))
3088 Fmake_frame_visible (WINDOW_FRAME (XWINDOW (window)));
3089 Vminibuf_scroll_window = window;
3090 w = XWINDOW (window);
3091 XSETFASTINT (w->hscroll, 0);
3092 XSETFASTINT (w->min_hscroll, 0);
3093 set_marker_restricted_both (w->start, buf, 1, 1);
3094 set_marker_restricted_both (w->pointm, buf, 1, 1);
3096 /* Run temp-buffer-show-hook, with the chosen window selected
3097 and it sbuffer current. */
3098 if (!NILP (Vrun_hooks))
3100 Lisp_Object tem;
3101 tem = Fboundp (Qtemp_buffer_show_hook);
3102 if (!NILP (tem))
3104 tem = Fsymbol_value (Qtemp_buffer_show_hook);
3105 if (!NILP (tem))
3107 int count = specpdl_ptr - specpdl;
3108 Lisp_Object prev_window;
3109 prev_window = selected_window;
3111 /* Select the window that was chosen, for running the hook. */
3112 record_unwind_protect (Fselect_window, prev_window);
3113 select_window_1 (window, 0);
3114 Fset_buffer (w->buffer);
3115 call1 (Vrun_hooks, Qtemp_buffer_show_hook);
3116 select_window_1 (prev_window, 0);
3117 unbind_to (count, Qnil);
3124 static void
3125 make_dummy_parent (window)
3126 Lisp_Object window;
3128 Lisp_Object new;
3129 register struct window *o, *p;
3130 register struct Lisp_Vector *vec;
3131 int i;
3133 o = XWINDOW (window);
3134 vec = allocate_vectorlike ((EMACS_INT)VECSIZE (struct window));
3135 for (i = 0; i < VECSIZE (struct window); ++i)
3136 vec->contents[i] = ((struct Lisp_Vector *)o)->contents[i];
3137 vec->size = VECSIZE (struct window);
3138 p = (struct window *)vec;
3139 XSETWINDOW (new, p);
3141 XSETFASTINT (p->sequence_number, ++sequence_number);
3143 /* Put new into window structure in place of window */
3144 replace_window (window, new);
3146 o->next = Qnil;
3147 o->prev = Qnil;
3148 o->vchild = Qnil;
3149 o->hchild = Qnil;
3150 o->parent = new;
3152 p->start = Qnil;
3153 p->pointm = Qnil;
3154 p->buffer = Qnil;
3157 DEFUN ("split-window", Fsplit_window, Ssplit_window, 0, 3, "",
3158 "Split WINDOW, putting SIZE lines in the first of the pair.\n\
3159 WINDOW defaults to selected one and SIZE to half its size.\n\
3160 If optional third arg HORFLAG is non-nil, split side by side\n\
3161 and put SIZE columns in the first of the pair. In that case,\n\
3162 SIZE includes that window's scroll bar, or the divider column to its right.")
3163 (window, size, horflag)
3164 Lisp_Object window, size, horflag;
3166 register Lisp_Object new;
3167 register struct window *o, *p;
3168 FRAME_PTR fo;
3169 register int size_int;
3171 if (NILP (window))
3172 window = selected_window;
3173 else
3174 CHECK_LIVE_WINDOW (window, 0);
3176 o = XWINDOW (window);
3177 fo = XFRAME (WINDOW_FRAME (o));
3179 if (NILP (size))
3181 if (!NILP (horflag))
3182 /* Calculate the size of the left-hand window, by dividing
3183 the usable space in columns by two.
3184 We round up, since the left-hand window may include
3185 a dividing line, while the right-hand may not. */
3186 size_int = (XFASTINT (o->width) + 1) >> 1;
3187 else
3188 size_int = XFASTINT (o->height) >> 1;
3190 else
3192 CHECK_NUMBER (size, 1);
3193 size_int = XINT (size);
3196 if (MINI_WINDOW_P (o))
3197 error ("Attempt to split minibuffer window");
3198 else if (window_fixed_size_p (o, !NILP (horflag), 0))
3199 error ("Attempt to split fixed-size window");
3201 check_min_window_sizes ();
3203 if (NILP (horflag))
3205 if (size_int < window_min_height)
3206 error ("Window height %d too small (after splitting)", size_int);
3207 if (size_int + window_min_height > XFASTINT (o->height))
3208 error ("Window height %d too small (after splitting)",
3209 XFASTINT (o->height) - size_int);
3210 if (NILP (o->parent)
3211 || NILP (XWINDOW (o->parent)->vchild))
3213 make_dummy_parent (window);
3214 new = o->parent;
3215 XWINDOW (new)->vchild = window;
3218 else
3220 if (size_int < window_min_width)
3221 error ("Window width %d too small (after splitting)", size_int);
3223 if (size_int + window_min_width > XFASTINT (o->width))
3224 error ("Window width %d too small (after splitting)",
3225 XFASTINT (o->width) - size_int);
3226 if (NILP (o->parent)
3227 || NILP (XWINDOW (o->parent)->hchild))
3229 make_dummy_parent (window);
3230 new = o->parent;
3231 XWINDOW (new)->hchild = window;
3235 /* Now we know that window's parent is a vertical combination
3236 if we are dividing vertically, or a horizontal combination
3237 if we are making side-by-side windows */
3239 windows_or_buffers_changed++;
3240 FRAME_WINDOW_SIZES_CHANGED (fo) = 1;
3241 new = make_window ();
3242 p = XWINDOW (new);
3244 p->frame = o->frame;
3245 p->next = o->next;
3246 if (!NILP (p->next))
3247 XWINDOW (p->next)->prev = new;
3248 p->prev = window;
3249 o->next = new;
3250 p->parent = o->parent;
3251 p->buffer = Qt;
3252 p->window_end_valid = Qnil;
3253 bzero (&p->last_cursor, sizeof p->last_cursor);
3255 /* Apportion the available frame space among the two new windows */
3257 if (!NILP (horflag))
3259 p->height = o->height;
3260 p->top = o->top;
3261 XSETFASTINT (p->width, XFASTINT (o->width) - size_int);
3262 XSETFASTINT (o->width, size_int);
3263 XSETFASTINT (p->left, XFASTINT (o->left) + size_int);
3265 else
3267 p->left = o->left;
3268 p->width = o->width;
3269 XSETFASTINT (p->height, XFASTINT (o->height) - size_int);
3270 XSETFASTINT (o->height, size_int);
3271 XSETFASTINT (p->top, XFASTINT (o->top) + size_int);
3274 /* Adjust glyph matrices. */
3275 adjust_glyphs (fo);
3276 Fset_window_buffer (new, o->buffer);
3277 return new;
3280 DEFUN ("enlarge-window", Fenlarge_window, Senlarge_window, 1, 2, "p",
3281 "Make current window ARG lines bigger.\n\
3282 From program, optional second arg non-nil means grow sideways ARG columns.")
3283 (arg, side)
3284 register Lisp_Object arg, side;
3286 CHECK_NUMBER (arg, 0);
3287 enlarge_window (selected_window, XINT (arg), !NILP (side));
3289 if (! NILP (Vwindow_configuration_change_hook))
3290 call1 (Vrun_hooks, Qwindow_configuration_change_hook);
3292 return Qnil;
3295 DEFUN ("shrink-window", Fshrink_window, Sshrink_window, 1, 2, "p",
3296 "Make current window ARG lines smaller.\n\
3297 From program, optional second arg non-nil means shrink sideways arg columns.")
3298 (arg, side)
3299 register Lisp_Object arg, side;
3301 CHECK_NUMBER (arg, 0);
3302 enlarge_window (selected_window, -XINT (arg), !NILP (side));
3304 if (! NILP (Vwindow_configuration_change_hook))
3305 call1 (Vrun_hooks, Qwindow_configuration_change_hook);
3307 return Qnil;
3311 window_height (window)
3312 Lisp_Object window;
3314 register struct window *p = XWINDOW (window);
3315 return XFASTINT (p->height);
3319 window_width (window)
3320 Lisp_Object window;
3322 register struct window *p = XWINDOW (window);
3323 return XFASTINT (p->width);
3327 #define CURBEG(w) \
3328 *(widthflag ? &(XWINDOW (w)->left) : &(XWINDOW (w)->top))
3330 #define CURSIZE(w) \
3331 *(widthflag ? &(XWINDOW (w)->width) : &(XWINDOW (w)->height))
3334 /* Enlarge selected_window by DELTA. WIDTHFLAG non-zero means
3335 increase its width. Siblings of the selected window are resized to
3336 fullfil the size request. If they become too small in the process,
3337 they will be deleted. */
3339 static void
3340 enlarge_window (window, delta, widthflag)
3341 Lisp_Object window;
3342 int delta, widthflag;
3344 Lisp_Object parent, next, prev;
3345 struct window *p;
3346 Lisp_Object *sizep;
3347 int maximum;
3348 int (*sizefun) P_ ((Lisp_Object))
3349 = widthflag ? window_width : window_height;
3350 void (*setsizefun) P_ ((Lisp_Object, int, int))
3351 = (widthflag ? set_window_width : set_window_height);
3353 /* Check values of window_min_width and window_min_height for
3354 validity. */
3355 check_min_window_sizes ();
3357 /* Give up if this window cannot be resized. */
3358 if (window_fixed_size_p (XWINDOW (window), widthflag, 1))
3359 error ("Window is not resizable");
3361 /* Find the parent of the selected window. */
3362 while (1)
3364 p = XWINDOW (window);
3365 parent = p->parent;
3367 if (NILP (parent))
3369 if (widthflag)
3370 error ("No other window to side of this one");
3371 break;
3374 if (widthflag
3375 ? !NILP (XWINDOW (parent)->hchild)
3376 : !NILP (XWINDOW (parent)->vchild))
3377 break;
3379 window = parent;
3382 sizep = &CURSIZE (window);
3385 register int maxdelta;
3387 maxdelta = (!NILP (parent) ? (*sizefun) (parent) - XINT (*sizep)
3388 : !NILP (p->next) ? ((*sizefun) (p->next)
3389 - window_min_size (XWINDOW (p->next),
3390 widthflag, 0, 0))
3391 : !NILP (p->prev) ? ((*sizefun) (p->prev)
3392 - window_min_size (XWINDOW (p->prev),
3393 widthflag, 0, 0))
3394 /* This is a frame with only one window, a minibuffer-only
3395 or a minibufferless frame. */
3396 : (delta = 0));
3398 if (delta > maxdelta)
3399 /* This case traps trying to make the minibuffer
3400 the full frame, or make the only window aside from the
3401 minibuffer the full frame. */
3402 delta = maxdelta;
3405 if (XINT (*sizep) + delta < window_min_size (XWINDOW (window), widthflag, 0, 0))
3407 delete_window (window);
3408 return;
3411 if (delta == 0)
3412 return;
3414 /* Find the total we can get from other siblings. */
3415 maximum = 0;
3416 for (next = p->next; ! NILP (next); next = XWINDOW (next)->next)
3417 maximum += (*sizefun) (next) - window_min_size (XWINDOW (next),
3418 widthflag, 0, 0);
3419 for (prev = p->prev; ! NILP (prev); prev = XWINDOW (prev)->prev)
3420 maximum += (*sizefun) (prev) - window_min_size (XWINDOW (prev),
3421 widthflag, 0, 0);
3423 /* If we can get it all from them, do so. */
3424 if (delta <= maximum)
3426 Lisp_Object first_unaffected;
3427 Lisp_Object first_affected;
3428 int fixed_p;
3430 next = p->next;
3431 prev = p->prev;
3432 first_affected = window;
3433 /* Look at one sibling at a time,
3434 moving away from this window in both directions alternately,
3435 and take as much as we can get without deleting that sibling. */
3436 while (delta != 0 && (!NILP (next) || !NILP (prev)))
3438 if (! NILP (next))
3440 int this_one = ((*sizefun) (next)
3441 - window_min_size (XWINDOW (next),
3442 widthflag, 0, &fixed_p));
3443 if (!fixed_p)
3445 if (this_one > delta)
3446 this_one = delta;
3448 (*setsizefun) (next, (*sizefun) (next) - this_one, 0);
3449 (*setsizefun) (window, XINT (*sizep) + this_one, 0);
3451 delta -= this_one;
3454 next = XWINDOW (next)->next;
3457 if (delta == 0)
3458 break;
3460 if (! NILP (prev))
3462 int this_one = ((*sizefun) (prev)
3463 - window_min_size (XWINDOW (prev),
3464 widthflag, 0, &fixed_p));
3465 if (!fixed_p)
3467 if (this_one > delta)
3468 this_one = delta;
3470 first_affected = prev;
3472 (*setsizefun) (prev, (*sizefun) (prev) - this_one, 0);
3473 (*setsizefun) (window, XINT (*sizep) + this_one, 0);
3475 delta -= this_one;
3478 prev = XWINDOW (prev)->prev;
3482 xassert (delta == 0);
3484 /* Now recalculate the edge positions of all the windows affected,
3485 based on the new sizes. */
3486 first_unaffected = next;
3487 prev = first_affected;
3488 for (next = XWINDOW (prev)->next; ! EQ (next, first_unaffected);
3489 prev = next, next = XWINDOW (next)->next)
3491 XSETINT (CURBEG (next), XINT (CURBEG (prev)) + (*sizefun) (prev));
3492 /* This does not change size of NEXT,
3493 but it propagates the new top edge to its children */
3494 (*setsizefun) (next, (*sizefun) (next), 0);
3497 else
3499 register int delta1;
3500 register int opht = (*sizefun) (parent);
3502 /* If trying to grow this window to or beyond size of the parent,
3503 make delta1 so big that, on shrinking back down,
3504 all the siblings end up with less than one line and are deleted. */
3505 if (opht <= XINT (*sizep) + delta)
3506 delta1 = opht * opht * 2;
3507 else
3509 /* Otherwise, make delta1 just right so that if we add
3510 delta1 lines to this window and to the parent, and then
3511 shrink the parent back to its original size, the new
3512 proportional size of this window will increase by delta.
3514 The function size_window will compute the new height h'
3515 of the window from delta1 as:
3517 e = delta1/n
3518 x = delta1 - delta1/n * n for the 1st resizable child
3519 h' = h + e + x
3521 where n is the number of children that can be resized.
3522 We can ignore x by choosing a delta1 that is a multiple of
3523 n. We want the height of this window to come out as
3525 h' = h + delta
3527 So, delta1 must be
3529 h + e = h + delta
3530 delta1/n = delta
3531 delta1 = n * delta.
3533 The number of children n rquals the number of resizable
3534 children of this window + 1 because we know window itself
3535 is resizable (otherwise we would have signalled an error. */
3537 struct window *w = XWINDOW (window);
3538 Lisp_Object s;
3539 int n = 1;
3541 for (s = w->next; !NILP (s); s = XWINDOW (s)->next)
3542 if (!window_fixed_size_p (XWINDOW (s), widthflag, 0))
3543 ++n;
3544 for (s = w->prev; !NILP (s); s = XWINDOW (s)->prev)
3545 if (!window_fixed_size_p (XWINDOW (s), widthflag, 0))
3546 ++n;
3548 delta1 = n * delta;
3551 /* Add delta1 lines or columns to this window, and to the parent,
3552 keeping things consistent while not affecting siblings. */
3553 XSETINT (CURSIZE (parent), opht + delta1);
3554 (*setsizefun) (window, XINT (*sizep) + delta1, 0);
3556 /* Squeeze out delta1 lines or columns from our parent,
3557 shriking this window and siblings proportionately.
3558 This brings parent back to correct size.
3559 Delta1 was calculated so this makes this window the desired size,
3560 taking it all out of the siblings. */
3561 (*setsizefun) (parent, opht, 0);
3564 XSETFASTINT (p->last_modified, 0);
3565 XSETFASTINT (p->last_overlay_modified, 0);
3567 /* Adjust glyph matrices. */
3568 adjust_glyphs (XFRAME (WINDOW_FRAME (XWINDOW (window))));
3571 #undef CURBEG
3572 #undef CURSIZE
3576 /***********************************************************************
3577 Resizing Mini-Windows
3578 ***********************************************************************/
3580 static void shrink_window_lowest_first P_ ((struct window *, int));
3582 enum save_restore_action
3584 CHECK_ORIG_SIZES,
3585 SAVE_ORIG_SIZES,
3586 RESTORE_ORIG_SIZES
3589 static int save_restore_orig_size P_ ((struct window *,
3590 enum save_restore_action));
3592 /* Shrink windows rooted in window W to HEIGHT. Take the space needed
3593 from lowest windows first. */
3595 static void
3596 shrink_window_lowest_first (w, height)
3597 struct window *w;
3598 int height;
3600 struct window *c;
3601 Lisp_Object child;
3602 int old_height;
3604 xassert (!MINI_WINDOW_P (w));
3606 /* Set redisplay hints. */
3607 XSETFASTINT (w->last_modified, 0);
3608 XSETFASTINT (w->last_overlay_modified, 0);
3609 windows_or_buffers_changed++;
3610 FRAME_WINDOW_SIZES_CHANGED (XFRAME (WINDOW_FRAME (w))) = 1;
3612 old_height = XFASTINT (w->height);
3613 XSETFASTINT (w->height, height);
3615 if (!NILP (w->hchild))
3617 for (child = w->hchild; !NILP (child); child = c->next)
3619 c = XWINDOW (child);
3620 c->top = w->top;
3621 shrink_window_lowest_first (c, height);
3624 else if (!NILP (w->vchild))
3626 Lisp_Object last_child;
3627 int delta = old_height - height;
3628 int last_top;
3630 last_child = Qnil;
3632 /* Find the last child. We are taking space from lowest windows
3633 first, so we iterate over children from the last child
3634 backwards. */
3635 for (child = w->vchild; !NILP (child); child = XWINDOW (child)->next)
3636 last_child = child;
3638 /* Assign new heights. We leave only MIN_SAFE_WINDOW_HEIGHT. */
3639 for (child = last_child; delta && !NILP (child); child = c->prev)
3641 int this_one;
3643 c = XWINDOW (child);
3644 this_one = XFASTINT (c->height) - MIN_SAFE_WINDOW_HEIGHT;
3646 if (this_one > delta)
3647 this_one = delta;
3649 shrink_window_lowest_first (c, XFASTINT (c->height) - this_one);
3650 delta -= this_one;
3653 /* Compute new positions. */
3654 last_top = XINT (w->top);
3655 for (child = w->vchild; !NILP (child); child = c->next)
3657 c = XWINDOW (child);
3658 c->top = make_number (last_top);
3659 shrink_window_lowest_first (c, XFASTINT (c->height));
3660 last_top += XFASTINT (c->height);
3666 /* Save, restore, or check positions and sizes in the window tree
3667 rooted at W. ACTION says what to do.
3669 If ACTION is CHECK_ORIG_SIZES, check if orig_top and orig_height
3670 members are valid for all windows in the window tree. Value is
3671 non-zero if they are valid.
3673 If ACTION is SAVE_ORIG_SIZES, save members top and height in
3674 orig_top and orig_height for all windows in the tree.
3676 If ACTION is RESTORE_ORIG_SIZES, restore top and height from
3677 values stored in orig_top and orig_height for all windows. */
3679 static int
3680 save_restore_orig_size (w, action)
3681 struct window *w;
3682 enum save_restore_action action;
3684 int success_p = 1;
3686 while (w)
3688 if (!NILP (w->hchild))
3690 if (!save_restore_orig_size (XWINDOW (w->hchild), action))
3691 success_p = 0;
3693 else if (!NILP (w->vchild))
3695 if (!save_restore_orig_size (XWINDOW (w->vchild), action))
3696 success_p = 0;
3699 switch (action)
3701 case CHECK_ORIG_SIZES:
3702 if (!INTEGERP (w->orig_top) || !INTEGERP (w->orig_height))
3703 return 0;
3704 break;
3706 case SAVE_ORIG_SIZES:
3707 w->orig_top = w->top;
3708 w->orig_height = w->height;
3709 XSETFASTINT (w->last_modified, 0);
3710 XSETFASTINT (w->last_overlay_modified, 0);
3711 break;
3713 case RESTORE_ORIG_SIZES:
3714 xassert (INTEGERP (w->orig_top) && INTEGERP (w->orig_height));
3715 w->top = w->orig_top;
3716 w->height = w->orig_height;
3717 w->orig_height = w->orig_top = Qnil;
3718 XSETFASTINT (w->last_modified, 0);
3719 XSETFASTINT (w->last_overlay_modified, 0);
3720 break;
3722 default:
3723 abort ();
3726 w = NILP (w->next) ? NULL : XWINDOW (w->next);
3729 return success_p;
3733 /* Grow mini-window W by DELTA lines, DELTA >= 0, or as much as we can
3734 without deleting other windows. */
3736 void
3737 grow_mini_window (w, delta)
3738 struct window *w;
3739 int delta;
3741 struct frame *f = XFRAME (w->frame);
3742 struct window *root;
3744 xassert (MINI_WINDOW_P (w));
3745 xassert (delta >= 0);
3747 /* Check values of window_min_width and window_min_height for
3748 validity. */
3749 check_min_window_sizes ();
3751 /* Compute how much we can enlarge the mini-window without deleting
3752 other windows. */
3753 root = XWINDOW (FRAME_ROOT_WINDOW (f));
3754 if (delta)
3756 int min_height = window_min_size (root, 0, 0, 0);
3757 if (XFASTINT (root->height) - delta < min_height)
3758 delta = XFASTINT (root->height) - min_height;
3761 if (delta)
3763 /* Save original window sizes and positions, if not already done. */
3764 if (!save_restore_orig_size (root, CHECK_ORIG_SIZES))
3765 save_restore_orig_size (root, SAVE_ORIG_SIZES);
3767 /* Shrink other windows. */
3768 shrink_window_lowest_first (root, XFASTINT (root->height) - delta);
3770 /* Grow the mini-window. */
3771 w->top = make_number (XFASTINT (root->top) + XFASTINT (root->height));
3772 w->height = make_number (XFASTINT (w->height) + delta);
3773 XSETFASTINT (w->last_modified, 0);
3774 XSETFASTINT (w->last_overlay_modified, 0);
3776 adjust_glyphs (f);
3781 /* Shrink mini-window W. If there is recorded info about window sizes
3782 before a call to grow_mini_window, restore recorded window sizes.
3783 Otherwise, if the mini-window is higher than 1 line, resize it to 1
3784 line. */
3786 void
3787 shrink_mini_window (w)
3788 struct window *w;
3790 struct frame *f = XFRAME (w->frame);
3791 struct window *root = XWINDOW (FRAME_ROOT_WINDOW (f));
3793 if (save_restore_orig_size (root, CHECK_ORIG_SIZES))
3795 save_restore_orig_size (root, RESTORE_ORIG_SIZES);
3796 adjust_glyphs (f);
3797 FRAME_WINDOW_SIZES_CHANGED (f) = 1;
3798 windows_or_buffers_changed = 1;
3800 else if (XFASTINT (w->height) > 1)
3802 Lisp_Object window;
3803 XSETWINDOW (window, w);
3804 enlarge_window (window, 1 - XFASTINT (w->height), 0);
3810 /* Mark window cursors off for all windows in the window tree rooted
3811 at W by setting their phys_cursor_on_p flag to zero. Called from
3812 xterm.c, e.g. when a frame is cleared and thereby all cursors on
3813 the frame are cleared. */
3815 void
3816 mark_window_cursors_off (w)
3817 struct window *w;
3819 while (w)
3821 if (!NILP (w->hchild))
3822 mark_window_cursors_off (XWINDOW (w->hchild));
3823 else if (!NILP (w->vchild))
3824 mark_window_cursors_off (XWINDOW (w->vchild));
3825 else
3826 w->phys_cursor_on_p = 0;
3828 w = NILP (w->next) ? 0 : XWINDOW (w->next);
3833 /* Return number of lines of text (not counting mode line) in W. */
3836 window_internal_height (w)
3837 struct window *w;
3839 int ht = XFASTINT (w->height);
3841 if (MINI_WINDOW_P (w))
3842 return ht;
3844 if (!NILP (w->parent) || !NILP (w->vchild) || !NILP (w->hchild)
3845 || !NILP (w->next) || !NILP (w->prev)
3846 || FRAME_WANTS_MODELINE_P (XFRAME (WINDOW_FRAME (w))))
3847 return ht - 1;
3849 return ht;
3853 /* Return the number of columns in W.
3854 Don't count columns occupied by scroll bars or the vertical bar
3855 separating W from the sibling to its right. */
3858 window_internal_width (w)
3859 struct window *w;
3861 struct frame *f = XFRAME (WINDOW_FRAME (w));
3862 int width = XINT (w->width);
3864 if (FRAME_HAS_VERTICAL_SCROLL_BARS (f))
3865 /* Scroll bars occupy a few columns. */
3866 width -= FRAME_SCROLL_BAR_COLS (f);
3867 else if (!WINDOW_RIGHTMOST_P (w) && !WINDOW_FULL_WIDTH_P (w))
3868 /* The column of `|' characters separating side-by-side windows
3869 occupies one column only. */
3870 width -= 1;
3872 /* On window-systems, areas to the left and right of the window
3873 are used to display bitmaps there. */
3874 if (FRAME_WINDOW_P (f))
3875 width -= FRAME_FLAGS_AREA_COLS (f);
3877 return width;
3881 /************************************************************************
3882 Window Scrolling
3883 ***********************************************************************/
3885 /* Scroll contents of window WINDOW up. If WHOLE is non-zero, scroll
3886 one screen-full, which is defined as the height of the window minus
3887 next_screen_context_lines. If WHOLE is zero, scroll up N lines
3888 instead. Negative values of N mean scroll down. NOERROR non-zero
3889 means don't signal an error if we try to move over BEGV or ZV,
3890 respectively. */
3892 static void
3893 window_scroll (window, n, whole, noerror)
3894 Lisp_Object window;
3895 int n;
3896 int whole;
3897 int noerror;
3899 /* If we must, use the pixel-based version which is much slower than
3900 the line-based one but can handle varying line heights. */
3901 if (FRAME_WINDOW_P (XFRAME (XWINDOW (window)->frame)))
3902 window_scroll_pixel_based (window, n, whole, noerror);
3903 else
3904 window_scroll_line_based (window, n, whole, noerror);
3908 /* Implementation of window_scroll that works based on pixel line
3909 heights. See the comment of window_scroll for parameter
3910 descriptions. */
3912 static void
3913 window_scroll_pixel_based (window, n, whole, noerror)
3914 Lisp_Object window;
3915 int n;
3916 int whole;
3917 int noerror;
3919 struct it it;
3920 struct window *w = XWINDOW (window);
3921 struct text_pos start;
3922 Lisp_Object tem;
3923 int this_scroll_margin;
3924 int preserve_y;
3925 /* True if we fiddled the window vscroll field without really scrolling. */
3926 int vscrolled = 0;
3928 SET_TEXT_POS_FROM_MARKER (start, w->start);
3930 /* If PT is not visible in WINDOW, move back one half of
3931 the screen. */
3932 tem = Fpos_visible_in_window_p (make_number (PT), window, Qnil);
3933 if (NILP (tem))
3935 /* Move backward half the height of the window. Performance note:
3936 vmotion used here is about 10% faster, but would give wrong
3937 results for variable height lines. */
3938 init_iterator (&it, w, PT, PT_BYTE, NULL, DEFAULT_FACE_ID);
3939 it.current_y = it.last_visible_y;
3940 move_it_vertically (&it, -it.last_visible_y / 2);
3942 /* The function move_iterator_vertically may move over more than
3943 the specified y-distance. If it->w is small, e.g. a
3944 mini-buffer window, we may end up in front of the window's
3945 display area. This is the case when Start displaying at the
3946 start of the line containing PT in this case. */
3947 if (it.current_y <= 0)
3949 init_iterator (&it, w, PT, PT_BYTE, NULL, DEFAULT_FACE_ID);
3950 move_it_vertically (&it, 0);
3951 it.current_y = 0;
3954 start = it.current.pos;
3957 /* If scroll_preserve_screen_position is non-zero, we try to set
3958 point in the same window line as it is now, so get that line. */
3959 if (!NILP (Vscroll_preserve_screen_position))
3961 start_display (&it, w, start);
3962 move_it_to (&it, PT, -1, -1, -1, MOVE_TO_POS);
3963 preserve_y = it.current_y;
3965 else
3966 preserve_y = -1;
3968 /* Move iterator it from start the specified distance forward or
3969 backward. The result is the new window start. */
3970 start_display (&it, w, start);
3971 if (whole)
3973 int screen_full = (it.last_visible_y
3974 - next_screen_context_lines * CANON_Y_UNIT (it.f));
3975 int direction = n < 0 ? -1 : 1;
3976 int dy = direction * screen_full;
3978 /* Note that move_it_vertically always moves the iterator to the
3979 start of a line. So, if the last line doesn't have a newline,
3980 we would end up at the start of the line ending at ZV. */
3981 if (dy <= 0)
3982 move_it_vertically_backward (&it, -dy);
3983 else if (dy > 0)
3984 move_it_to (&it, ZV, -1, it.current_y + dy, -1,
3985 MOVE_TO_POS | MOVE_TO_Y);
3987 else
3988 move_it_by_lines (&it, n, 1);
3990 /* End if we end up at ZV or BEGV. */
3991 if ((n > 0 && IT_CHARPOS (it) == ZV)
3992 || (n < 0 && IT_CHARPOS (it) == CHARPOS (start)))
3994 if (IT_CHARPOS (it) == ZV)
3996 if (it.current_y + it.max_ascent + it.max_descent
3997 > it.last_visible_y)
3998 /* The last line was only partially visible, make it fully
3999 visible. */
4000 w->vscroll = (it.last_visible_y
4001 - it.current_y + it.max_ascent + it.max_descent);
4002 else if (noerror)
4003 return;
4004 else
4005 Fsignal (Qend_of_buffer, Qnil);
4007 else
4009 if (w->vscroll != 0)
4010 /* The first line was only partially visible, make it fully
4011 visible. */
4012 w->vscroll = 0;
4013 else if (noerror)
4014 return;
4015 else
4016 Fsignal (Qbeginning_of_buffer, Qnil);
4019 /* If control gets here, then we vscrolled. */
4021 XBUFFER (w->buffer)->prevent_redisplay_optimizations_p = 1;
4023 /* Don't try to change the window start below. */
4024 vscrolled = 1;
4027 if (! vscrolled)
4029 /* Set the window start, and set up the window for redisplay. */
4030 set_marker_restricted (w->start, make_number (IT_CHARPOS (it)),
4031 w->buffer);
4032 w->start_at_line_beg = Fbolp ();
4033 w->update_mode_line = Qt;
4034 XSETFASTINT (w->last_modified, 0);
4035 XSETFASTINT (w->last_overlay_modified, 0);
4036 /* Set force_start so that redisplay_window will run the
4037 window-scroll-functions. */
4038 w->force_start = Qt;
4041 it.current_y = it.vpos = 0;
4043 /* Preserve the screen position if we must. */
4044 if (preserve_y >= 0)
4046 move_it_to (&it, -1, -1, preserve_y, -1, MOVE_TO_Y);
4047 SET_PT_BOTH (IT_CHARPOS (it), IT_BYTEPOS (it));
4049 else
4051 /* Move PT out of scroll margins. */
4052 this_scroll_margin = max (0, scroll_margin);
4053 this_scroll_margin = min (this_scroll_margin, XFASTINT (w->height) / 4);
4054 this_scroll_margin *= CANON_Y_UNIT (it.f);
4056 if (n > 0)
4058 /* We moved the window start towards ZV, so PT may be now
4059 in the scroll margin at the top. */
4060 move_it_to (&it, PT, -1, -1, -1, MOVE_TO_POS);
4061 while (it.current_y < this_scroll_margin)
4062 move_it_by_lines (&it, 1, 1);
4063 SET_PT_BOTH (IT_CHARPOS (it), IT_BYTEPOS (it));
4065 else if (n < 0)
4067 int charpos, bytepos;
4069 /* We moved the window start towards BEGV, so PT may be now
4070 in the scroll margin at the bottom. */
4071 move_it_to (&it, PT, -1,
4072 it.last_visible_y - this_scroll_margin - 1, -1,
4073 MOVE_TO_POS | MOVE_TO_Y);
4075 /* Save our position, in case it's correct. */
4076 charpos = IT_CHARPOS (it);
4077 bytepos = IT_BYTEPOS (it);
4079 /* See if point is on a partially visible line at the end. */
4080 move_it_by_lines (&it, 1, 1);
4081 if (it.current_y > it.last_visible_y)
4082 /* The last line was only partially visible, so back up two
4083 lines to make sure we're on a fully visible line. */
4085 move_it_by_lines (&it, -2, 0);
4086 SET_PT_BOTH (IT_CHARPOS (it), IT_BYTEPOS (it));
4088 else
4089 /* No, the position we saved is OK, so use it. */
4090 SET_PT_BOTH (charpos, bytepos);
4096 /* Implementation of window_scroll that works based on screen lines.
4097 See the comment of window_scroll for parameter descriptions. */
4099 static void
4100 window_scroll_line_based (window, n, whole, noerror)
4101 Lisp_Object window;
4102 int n;
4103 int whole;
4104 int noerror;
4106 register struct window *w = XWINDOW (window);
4107 register int opoint = PT, opoint_byte = PT_BYTE;
4108 register int pos, pos_byte;
4109 register int ht = window_internal_height (w);
4110 register Lisp_Object tem;
4111 int lose;
4112 Lisp_Object bolp;
4113 int startpos;
4114 struct position posit;
4115 int original_vpos;
4117 startpos = marker_position (w->start);
4119 posit = *compute_motion (startpos, 0, 0, 0,
4120 PT, ht, 0,
4121 window_internal_width (w), XINT (w->hscroll),
4122 0, w);
4123 original_vpos = posit.vpos;
4125 XSETFASTINT (tem, PT);
4126 tem = Fpos_visible_in_window_p (tem, window, Qnil);
4128 if (NILP (tem))
4130 Fvertical_motion (make_number (- (ht / 2)), window);
4131 startpos = PT;
4134 SET_PT (startpos);
4135 lose = n < 0 && PT == BEGV;
4136 Fvertical_motion (make_number (n), window);
4137 pos = PT;
4138 pos_byte = PT_BYTE;
4139 bolp = Fbolp ();
4140 SET_PT_BOTH (opoint, opoint_byte);
4142 if (lose)
4144 if (noerror)
4145 return;
4146 else
4147 Fsignal (Qbeginning_of_buffer, Qnil);
4150 if (pos < ZV)
4152 int this_scroll_margin = scroll_margin;
4154 /* Don't use a scroll margin that is negative or too large. */
4155 if (this_scroll_margin < 0)
4156 this_scroll_margin = 0;
4158 if (XINT (w->height) < 4 * scroll_margin)
4159 this_scroll_margin = XINT (w->height) / 4;
4161 set_marker_restricted_both (w->start, w->buffer, pos, pos_byte);
4162 w->start_at_line_beg = bolp;
4163 w->update_mode_line = Qt;
4164 XSETFASTINT (w->last_modified, 0);
4165 XSETFASTINT (w->last_overlay_modified, 0);
4166 /* Set force_start so that redisplay_window will run
4167 the window-scroll-functions. */
4168 w->force_start = Qt;
4170 if (whole && !NILP (Vscroll_preserve_screen_position))
4172 SET_PT_BOTH (pos, pos_byte);
4173 Fvertical_motion (make_number (original_vpos), window);
4175 /* If we scrolled forward, put point enough lines down
4176 that it is outside the scroll margin. */
4177 else if (n > 0)
4179 int top_margin;
4181 if (this_scroll_margin > 0)
4183 SET_PT_BOTH (pos, pos_byte);
4184 Fvertical_motion (make_number (this_scroll_margin), window);
4185 top_margin = PT;
4187 else
4188 top_margin = pos;
4190 if (top_margin <= opoint)
4191 SET_PT_BOTH (opoint, opoint_byte);
4192 else if (!NILP (Vscroll_preserve_screen_position))
4194 SET_PT_BOTH (pos, pos_byte);
4195 Fvertical_motion (make_number (original_vpos), window);
4197 else
4198 SET_PT (top_margin);
4200 else if (n < 0)
4202 int bottom_margin;
4204 /* If we scrolled backward, put point near the end of the window
4205 but not within the scroll margin. */
4206 SET_PT_BOTH (pos, pos_byte);
4207 tem = Fvertical_motion (make_number (ht - this_scroll_margin), window);
4208 if (XFASTINT (tem) == ht - this_scroll_margin)
4209 bottom_margin = PT;
4210 else
4211 bottom_margin = PT + 1;
4213 if (bottom_margin > opoint)
4214 SET_PT_BOTH (opoint, opoint_byte);
4215 else
4217 if (!NILP (Vscroll_preserve_screen_position))
4219 SET_PT_BOTH (pos, pos_byte);
4220 Fvertical_motion (make_number (original_vpos), window);
4222 else
4223 Fvertical_motion (make_number (-1), window);
4227 else
4229 if (noerror)
4230 return;
4231 else
4232 Fsignal (Qend_of_buffer, Qnil);
4237 /* Scroll selected_window up or down. If N is nil, scroll a
4238 screen-full which is defined as the height of the window minus
4239 next_screen_context_lines. If N is the symbol `-', scroll.
4240 DIRECTION may be 1 meaning to scroll down, or -1 meaning to scroll
4241 up. This is the guts of Fscroll_up and Fscroll_down. */
4243 static void
4244 scroll_command (n, direction)
4245 Lisp_Object n;
4246 int direction;
4248 register int defalt;
4249 int count = specpdl_ptr - specpdl;
4251 xassert (abs (direction) == 1);
4253 /* If selected window's buffer isn't current, make it current for
4254 the moment. But don't screw up if window_scroll gets an error. */
4255 if (XBUFFER (XWINDOW (selected_window)->buffer) != current_buffer)
4257 record_unwind_protect (save_excursion_restore, save_excursion_save ());
4258 Fset_buffer (XWINDOW (selected_window)->buffer);
4260 /* Make redisplay consider other windows than just selected_window. */
4261 ++windows_or_buffers_changed;
4264 defalt = (window_internal_height (XWINDOW (selected_window))
4265 - next_screen_context_lines);
4266 defalt = direction * (defalt < 1 ? 1 : defalt);
4268 if (NILP (n))
4269 window_scroll (selected_window, defalt, 1, 0);
4270 else if (EQ (n, Qminus))
4271 window_scroll (selected_window, - defalt, 1, 0);
4272 else
4274 n = Fprefix_numeric_value (n);
4275 window_scroll (selected_window, XINT (n) * direction, 0, 0);
4278 unbind_to (count, Qnil);
4281 DEFUN ("scroll-up", Fscroll_up, Sscroll_up, 0, 1, "P",
4282 "Scroll text of current window upward ARG lines; or near full screen if no ARG.\n\
4283 A near full screen is `next-screen-context-lines' less than a full screen.\n\
4284 Negative ARG means scroll downward.\n\
4285 If ARG is the atom `-', scroll downward by nearly full screen.\n\
4286 When calling from a program, supply as argument a number, nil, or `-'.")
4287 (arg)
4288 Lisp_Object arg;
4290 scroll_command (arg, 1);
4291 return Qnil;
4294 DEFUN ("scroll-down", Fscroll_down, Sscroll_down, 0, 1, "P",
4295 "Scroll text of current window down ARG lines; or near full screen if no ARG.\n\
4296 A near full screen is `next-screen-context-lines' less than a full screen.\n\
4297 Negative ARG means scroll upward.\n\
4298 If ARG is the atom `-', scroll upward by nearly full screen.\n\
4299 When calling from a program, supply as argument a number, nil, or `-'.")
4300 (arg)
4301 Lisp_Object arg;
4303 scroll_command (arg, -1);
4304 return Qnil;
4307 DEFUN ("other-window-for-scrolling", Fother_window_for_scrolling, Sother_window_for_scrolling, 0, 0, 0,
4308 "Return the other window for \"other window scroll\" commands.\n\
4309 If in the minibuffer, `minibuffer-scroll-window' if non-nil\n\
4310 specifies the window.\n\
4311 If `other-window-scroll-buffer' is non-nil, a window\n\
4312 showing that buffer is used.")
4315 Lisp_Object window;
4317 if (MINI_WINDOW_P (XWINDOW (selected_window))
4318 && !NILP (Vminibuf_scroll_window))
4319 window = Vminibuf_scroll_window;
4320 /* If buffer is specified, scroll that buffer. */
4321 else if (!NILP (Vother_window_scroll_buffer))
4323 window = Fget_buffer_window (Vother_window_scroll_buffer, Qnil);
4324 if (NILP (window))
4325 window = Fdisplay_buffer (Vother_window_scroll_buffer, Qt, Qnil);
4327 else
4329 /* Nothing specified; look for a neighboring window on the same
4330 frame. */
4331 window = Fnext_window (selected_window, Qnil, Qnil);
4333 if (EQ (window, selected_window))
4334 /* That didn't get us anywhere; look for a window on another
4335 visible frame. */
4337 window = Fnext_window (window, Qnil, Qt);
4338 while (! FRAME_VISIBLE_P (XFRAME (WINDOW_FRAME (XWINDOW (window))))
4339 && ! EQ (window, selected_window));
4342 CHECK_LIVE_WINDOW (window, 0);
4344 if (EQ (window, selected_window))
4345 error ("There is no other window");
4347 return window;
4350 DEFUN ("scroll-other-window", Fscroll_other_window, Sscroll_other_window, 0, 1, "P",
4351 "Scroll next window upward ARG lines; or near full screen if no ARG.\n\
4352 A near full screen is `next-screen-context-lines' less than a full screen.\n\
4353 The next window is the one below the current one; or the one at the top\n\
4354 if the current one is at the bottom. Negative ARG means scroll downward.\n\
4355 If ARG is the atom `-', scroll downward by nearly full screen.\n\
4356 When calling from a program, supply as argument a number, nil, or `-'.\n\
4358 If in the minibuffer, `minibuffer-scroll-window' if non-nil\n\
4359 specifies the window to scroll.\n\
4360 If `other-window-scroll-buffer' is non-nil, scroll the window\n\
4361 showing that buffer, popping the buffer up if necessary.")
4362 (arg)
4363 register Lisp_Object arg;
4365 register Lisp_Object window;
4366 register int defalt;
4367 register struct window *w;
4368 register int count = specpdl_ptr - specpdl;
4370 window = Fother_window_for_scrolling ();
4372 w = XWINDOW (window);
4373 defalt = window_internal_height (w) - next_screen_context_lines;
4374 if (defalt < 1) defalt = 1;
4376 /* Don't screw up if window_scroll gets an error. */
4377 record_unwind_protect (save_excursion_restore, save_excursion_save ());
4378 ++windows_or_buffers_changed;
4380 Fset_buffer (w->buffer);
4381 SET_PT (marker_position (w->pointm));
4383 if (NILP (arg))
4384 window_scroll (window, defalt, 1, 1);
4385 else if (EQ (arg, Qminus))
4386 window_scroll (window, -defalt, 1, 1);
4387 else
4389 if (CONSP (arg))
4390 arg = Fcar (arg);
4391 CHECK_NUMBER (arg, 0);
4392 window_scroll (window, XINT (arg), 0, 1);
4395 set_marker_both (w->pointm, Qnil, PT, PT_BYTE);
4396 unbind_to (count, Qnil);
4398 return Qnil;
4401 DEFUN ("scroll-left", Fscroll_left, Sscroll_left, 0, 1, "P",
4402 "Scroll selected window display ARG columns left.\n\
4403 Default for ARG is window width minus 2.")
4404 (arg)
4405 register Lisp_Object arg;
4408 if (NILP (arg))
4409 XSETFASTINT (arg, window_internal_width (XWINDOW (selected_window)) - 2);
4410 else
4411 arg = Fprefix_numeric_value (arg);
4413 return
4414 Fset_window_hscroll (selected_window,
4415 make_number (XINT (XWINDOW (selected_window)->hscroll)
4416 + XINT (arg)));
4419 DEFUN ("scroll-right", Fscroll_right, Sscroll_right, 0, 1, "P",
4420 "Scroll selected window display ARG columns right.\n\
4421 Default for ARG is window width minus 2.")
4422 (arg)
4423 register Lisp_Object arg;
4425 if (NILP (arg))
4426 XSETFASTINT (arg, window_internal_width (XWINDOW (selected_window)) - 2);
4427 else
4428 arg = Fprefix_numeric_value (arg);
4430 return
4431 Fset_window_hscroll (selected_window,
4432 make_number (XINT (XWINDOW (selected_window)->hscroll)
4433 - XINT (arg)));
4436 DEFUN ("recenter", Frecenter, Srecenter, 0, 1, "P",
4437 "Center point in window and redisplay frame. With ARG, put point on line ARG.\n\
4438 The desired position of point is always relative to the current window.\n\
4439 Just C-u as prefix means put point in the center of the window.\n\
4440 If ARG is omitted or nil, erases the entire frame and then\n\
4441 redraws with point in the center of the current window.")
4442 (arg)
4443 register Lisp_Object arg;
4445 register struct window *w = XWINDOW (selected_window);
4446 register int ht = window_internal_height (w);
4447 struct position pos;
4448 struct buffer *buf = XBUFFER (w->buffer);
4449 struct buffer *obuf = current_buffer;
4451 if (NILP (arg))
4453 extern int frame_garbaged;
4454 int i;
4456 /* Invalidate pixel data calculated for all compositions. */
4457 for (i = 0; i < n_compositions; i++)
4458 composition_table[i]->font = NULL;
4460 Fredraw_frame (w->frame);
4461 SET_FRAME_GARBAGED (XFRAME (WINDOW_FRAME (w)));
4462 XSETFASTINT (arg, ht / 2);
4464 else if (CONSP (arg)) /* Just C-u. */
4466 XSETFASTINT (arg, ht / 2);
4468 else
4470 arg = Fprefix_numeric_value (arg);
4471 CHECK_NUMBER (arg, 0);
4474 if (XINT (arg) < 0)
4475 XSETINT (arg, XINT (arg) + ht);
4477 set_buffer_internal (buf);
4478 pos = *vmotion (PT, - XINT (arg), w);
4480 set_marker_both (w->start, w->buffer, pos.bufpos, pos.bytepos);
4481 w->start_at_line_beg = ((pos.bytepos == BEGV_BYTE
4482 || FETCH_BYTE (pos.bytepos - 1) == '\n')
4483 ? Qt : Qnil);
4484 w->force_start = Qt;
4485 set_buffer_internal (obuf);
4487 return Qnil;
4491 /* Value is the number of lines actually displayed in window W,
4492 as opposed to its height. */
4494 static int
4495 displayed_window_lines (w)
4496 struct window *w;
4498 struct it it;
4499 struct text_pos start;
4500 int height = window_box_height (w);
4501 struct buffer *old_buffer;
4502 int bottom_y;
4504 if (XBUFFER (w->buffer) != current_buffer)
4506 old_buffer = current_buffer;
4507 set_buffer_internal (XBUFFER (w->buffer));
4509 else
4510 old_buffer = NULL;
4512 SET_TEXT_POS_FROM_MARKER (start, w->start);
4513 start_display (&it, w, start);
4514 move_it_vertically (&it, height);
4516 if (old_buffer)
4517 set_buffer_internal (old_buffer);
4519 bottom_y = it.current_y + it.max_ascent + it.max_descent;
4521 if (bottom_y > it.current_y && bottom_y <= it.last_visible_y)
4522 /* Hit a line without a terminating newline. */
4523 it.vpos++;
4525 /* Add in empty lines at the bottom of the window. */
4526 if (bottom_y < height)
4528 struct frame *f = XFRAME (w->frame);
4529 int rest = height - bottom_y;
4530 int lines = rest / CANON_Y_UNIT (f);
4531 it.vpos += lines;
4534 return it.vpos;
4538 DEFUN ("window-text-height", Fwindow_text_height, Swindow_text_height,
4539 0, 1, 0,
4540 "Return the height in lines of the text display area of WINDOW.\n\
4541 This doesn't include the mode-line (or header-line if any) or any\n\
4542 partial-height lines in the text display area.")
4543 (window)
4544 Lisp_Object window;
4546 struct window *w = decode_window (window);
4547 int pixel_height = window_box_height (w);
4548 int line_height = pixel_height / CANON_Y_UNIT (XFRAME (w->frame));
4549 return make_number (line_height);
4554 DEFUN ("move-to-window-line", Fmove_to_window_line, Smove_to_window_line,
4555 1, 1, "P",
4556 "Position point relative to window.\n\
4557 With no argument, position point at center of window.\n\
4558 An argument specifies vertical position within the window;\n\
4559 zero means top of window, negative means relative to bottom of window.")
4560 (arg)
4561 Lisp_Object arg;
4563 struct window *w = XWINDOW (selected_window);
4564 int lines, start;
4565 Lisp_Object window;
4567 window = selected_window;
4568 start = marker_position (w->start);
4569 if (start < BEGV || start > ZV)
4571 int height = window_internal_height (w);
4572 Fvertical_motion (make_number (- (height / 2)), window);
4573 set_marker_both (w->start, w->buffer, PT, PT_BYTE);
4574 w->start_at_line_beg = Fbolp ();
4575 w->force_start = Qt;
4577 else
4578 Fgoto_char (w->start);
4580 lines = displayed_window_lines (w);
4581 if (NILP (arg))
4582 XSETFASTINT (arg, lines / 2);
4583 else
4585 arg = Fprefix_numeric_value (arg);
4586 if (XINT (arg) < 0)
4587 XSETINT (arg, XINT (arg) + lines);
4590 if (w->vscroll)
4591 /* Skip past a partially visible first line. */
4592 XSETINT (arg, XINT (arg) + 1);
4594 return Fvertical_motion (arg, window);
4599 /***********************************************************************
4600 Window Configuration
4601 ***********************************************************************/
4603 struct save_window_data
4605 EMACS_INT size_from_Lisp_Vector_struct;
4606 struct Lisp_Vector *next_from_Lisp_Vector_struct;
4607 Lisp_Object frame_width, frame_height, frame_menu_bar_lines;
4608 Lisp_Object frame_tool_bar_lines;
4609 Lisp_Object selected_frame;
4610 Lisp_Object current_window;
4611 Lisp_Object current_buffer;
4612 Lisp_Object minibuf_scroll_window;
4613 Lisp_Object root_window;
4614 Lisp_Object focus_frame;
4615 /* Record the values of window-min-width and window-min-height
4616 so that window sizes remain consistent with them. */
4617 Lisp_Object min_width, min_height;
4618 /* A vector, each of whose elements is a struct saved_window
4619 for one window. */
4620 Lisp_Object saved_windows;
4623 /* This is saved as a Lisp_Vector */
4624 struct saved_window
4626 /* these first two must agree with struct Lisp_Vector in lisp.h */
4627 EMACS_INT size_from_Lisp_Vector_struct;
4628 struct Lisp_Vector *next_from_Lisp_Vector_struct;
4630 Lisp_Object window;
4631 Lisp_Object buffer, start, pointm, mark;
4632 Lisp_Object left, top, width, height, hscroll, min_hscroll;
4633 Lisp_Object parent, prev;
4634 Lisp_Object start_at_line_beg;
4635 Lisp_Object display_table;
4636 Lisp_Object orig_top, orig_height;
4639 #define SAVED_WINDOW_VECTOR_SIZE 17 /* Arg to Fmake_vector */
4641 #define SAVED_WINDOW_N(swv,n) \
4642 ((struct saved_window *) (XVECTOR ((swv)->contents[(n)])))
4644 DEFUN ("window-configuration-p", Fwindow_configuration_p, Swindow_configuration_p, 1, 1, 0,
4645 "Return t if OBJECT is a window-configuration object.")
4646 (object)
4647 Lisp_Object object;
4649 if (WINDOW_CONFIGURATIONP (object))
4650 return Qt;
4651 return Qnil;
4654 DEFUN ("window-configuration-frame", Fwindow_configuration_frame, Swindow_configuration_frame, 1, 1, 0,
4655 "Return the frame that CONFIG, a window-configuration object, is about.")
4656 (config)
4657 Lisp_Object config;
4659 register struct save_window_data *data;
4660 struct Lisp_Vector *saved_windows;
4662 if (! WINDOW_CONFIGURATIONP (config))
4663 wrong_type_argument (Qwindow_configuration_p, config);
4665 data = (struct save_window_data *) XVECTOR (config);
4666 saved_windows = XVECTOR (data->saved_windows);
4667 return XWINDOW (SAVED_WINDOW_N (saved_windows, 0)->window)->frame;
4670 DEFUN ("set-window-configuration", Fset_window_configuration,
4671 Sset_window_configuration, 1, 1, 0,
4672 "Set the configuration of windows and buffers as specified by CONFIGURATION.\n\
4673 CONFIGURATION must be a value previously returned\n\
4674 by `current-window-configuration' (which see).\n\
4675 If CONFIGURATION was made from a frame that is now deleted,\n\
4676 only frame-independent values can be restored. In this case,\n\
4677 the return value is nil. Otherwise the value is t.")
4678 (configuration)
4679 Lisp_Object configuration;
4681 register struct save_window_data *data;
4682 struct Lisp_Vector *saved_windows;
4683 Lisp_Object new_current_buffer;
4684 Lisp_Object frame;
4685 FRAME_PTR f;
4686 int old_point = -1;
4688 while (!WINDOW_CONFIGURATIONP (configuration))
4689 wrong_type_argument (Qwindow_configuration_p, configuration);
4691 data = (struct save_window_data *) XVECTOR (configuration);
4692 saved_windows = XVECTOR (data->saved_windows);
4694 new_current_buffer = data->current_buffer;
4695 if (NILP (XBUFFER (new_current_buffer)->name))
4696 new_current_buffer = Qnil;
4697 else
4699 if (XBUFFER (new_current_buffer) == current_buffer)
4700 old_point = PT;
4703 frame = XWINDOW (SAVED_WINDOW_N (saved_windows, 0)->window)->frame;
4704 f = XFRAME (frame);
4706 /* If f is a dead frame, don't bother rebuilding its window tree.
4707 However, there is other stuff we should still try to do below. */
4708 if (FRAME_LIVE_P (f))
4710 register struct window *w;
4711 register struct saved_window *p;
4712 struct window *root_window;
4713 struct window **leaf_windows;
4714 int n_leaf_windows;
4715 int k, i, n;
4717 /* If the frame has been resized since this window configuration was
4718 made, we change the frame to the size specified in the
4719 configuration, restore the configuration, and then resize it
4720 back. We keep track of the prevailing height in these variables. */
4721 int previous_frame_height = FRAME_HEIGHT (f);
4722 int previous_frame_width = FRAME_WIDTH (f);
4723 int previous_frame_menu_bar_lines = FRAME_MENU_BAR_LINES (f);
4724 int previous_frame_tool_bar_lines = FRAME_TOOL_BAR_LINES (f);
4726 /* The mouse highlighting code could get screwed up
4727 if it runs during this. */
4728 BLOCK_INPUT;
4730 if (XFASTINT (data->frame_height) != previous_frame_height
4731 || XFASTINT (data->frame_width) != previous_frame_width)
4732 change_frame_size (f, XFASTINT (data->frame_height),
4733 XFASTINT (data->frame_width), 0, 0, 0);
4734 #if defined (HAVE_WINDOW_SYSTEM) || defined (MSDOS)
4735 if (XFASTINT (data->frame_menu_bar_lines)
4736 != previous_frame_menu_bar_lines)
4737 x_set_menu_bar_lines (f, data->frame_menu_bar_lines, make_number (0));
4738 #ifdef HAVE_WINDOW_SYSTEM
4739 if (XFASTINT (data->frame_tool_bar_lines)
4740 != previous_frame_tool_bar_lines)
4741 x_set_tool_bar_lines (f, data->frame_tool_bar_lines, make_number (0));
4742 #endif
4743 #endif
4745 /* "Swap out" point from the selected window
4746 into its buffer. We do this now, before
4747 restoring the window contents, and prevent it from
4748 being done later on when we select a new window. */
4749 if (! NILP (XWINDOW (selected_window)->buffer))
4751 w = XWINDOW (selected_window);
4752 set_marker_both (w->pointm,
4753 w->buffer,
4754 BUF_PT (XBUFFER (w->buffer)),
4755 BUF_PT_BYTE (XBUFFER (w->buffer)));
4758 windows_or_buffers_changed++;
4759 FRAME_WINDOW_SIZES_CHANGED (f) = 1;
4761 /* Problem: Freeing all matrices and later allocating them again
4762 is a serious redisplay flickering problem. What we would
4763 really like to do is to free only those matrices not reused
4764 below. */
4765 root_window = XWINDOW (FRAME_ROOT_WINDOW (f));
4766 leaf_windows
4767 = (struct window **) alloca (count_windows (root_window)
4768 * sizeof (struct window *));
4769 n_leaf_windows = get_leaf_windows (root_window, leaf_windows, 0);
4771 /* Temporarily avoid any problems with windows that are smaller
4772 than they are supposed to be. */
4773 window_min_height = 1;
4774 window_min_width = 1;
4776 /* Kludge Alert!
4777 Mark all windows now on frame as "deleted".
4778 Restoring the new configuration "undeletes" any that are in it.
4780 Save their current buffers in their height fields, since we may
4781 need it later, if a buffer saved in the configuration is now
4782 dead. */
4783 delete_all_subwindows (XWINDOW (FRAME_ROOT_WINDOW (f)));
4785 for (k = 0; k < saved_windows->size; k++)
4787 p = SAVED_WINDOW_N (saved_windows, k);
4788 w = XWINDOW (p->window);
4789 w->next = Qnil;
4791 if (!NILP (p->parent))
4792 w->parent = SAVED_WINDOW_N (saved_windows,
4793 XFASTINT (p->parent))->window;
4794 else
4795 w->parent = Qnil;
4797 if (!NILP (p->prev))
4799 w->prev = SAVED_WINDOW_N (saved_windows,
4800 XFASTINT (p->prev))->window;
4801 XWINDOW (w->prev)->next = p->window;
4803 else
4805 w->prev = Qnil;
4806 if (!NILP (w->parent))
4808 if (EQ (p->width, XWINDOW (w->parent)->width))
4810 XWINDOW (w->parent)->vchild = p->window;
4811 XWINDOW (w->parent)->hchild = Qnil;
4813 else
4815 XWINDOW (w->parent)->hchild = p->window;
4816 XWINDOW (w->parent)->vchild = Qnil;
4821 /* If we squirreled away the buffer in the window's height,
4822 restore it now. */
4823 if (BUFFERP (w->height))
4824 w->buffer = w->height;
4825 w->left = p->left;
4826 w->top = p->top;
4827 w->width = p->width;
4828 w->height = p->height;
4829 w->hscroll = p->hscroll;
4830 w->min_hscroll = p->min_hscroll;
4831 w->display_table = p->display_table;
4832 w->orig_top = p->orig_top;
4833 w->orig_height = p->orig_height;
4834 XSETFASTINT (w->last_modified, 0);
4835 XSETFASTINT (w->last_overlay_modified, 0);
4837 /* Reinstall the saved buffer and pointers into it. */
4838 if (NILP (p->buffer))
4839 w->buffer = p->buffer;
4840 else
4842 if (!NILP (XBUFFER (p->buffer)->name))
4843 /* If saved buffer is alive, install it. */
4845 w->buffer = p->buffer;
4846 w->start_at_line_beg = p->start_at_line_beg;
4847 set_marker_restricted (w->start, p->start, w->buffer);
4848 set_marker_restricted (w->pointm, p->pointm, w->buffer);
4849 Fset_marker (XBUFFER (w->buffer)->mark,
4850 p->mark, w->buffer);
4852 /* As documented in Fcurrent_window_configuration, don't
4853 save the location of point in the buffer which was current
4854 when the window configuration was recorded. */
4855 if (!EQ (p->buffer, new_current_buffer)
4856 && XBUFFER (p->buffer) == current_buffer)
4857 Fgoto_char (w->pointm);
4859 else if (NILP (w->buffer) || NILP (XBUFFER (w->buffer)->name))
4860 /* Else unless window has a live buffer, get one. */
4862 w->buffer = Fcdr (Fcar (Vbuffer_alist));
4863 /* This will set the markers to beginning of visible
4864 range. */
4865 set_marker_restricted (w->start, make_number (0), w->buffer);
4866 set_marker_restricted (w->pointm, make_number (0),w->buffer);
4867 w->start_at_line_beg = Qt;
4869 else
4870 /* Keeping window's old buffer; make sure the markers
4871 are real. */
4873 /* Set window markers at start of visible range. */
4874 if (XMARKER (w->start)->buffer == 0)
4875 set_marker_restricted (w->start, make_number (0),
4876 w->buffer);
4877 if (XMARKER (w->pointm)->buffer == 0)
4878 set_marker_restricted_both (w->pointm, w->buffer,
4879 BUF_PT (XBUFFER (w->buffer)),
4880 BUF_PT_BYTE (XBUFFER (w->buffer)));
4881 w->start_at_line_beg = Qt;
4886 FRAME_ROOT_WINDOW (f) = data->root_window;
4887 /* Prevent "swapping out point" in the old selected window
4888 using the buffer that has been restored into it.
4889 That swapping out has already been done,
4890 near the beginning of this function. */
4891 selected_window = Qnil;
4892 Fselect_window (data->current_window);
4893 XBUFFER (XWINDOW (selected_window)->buffer)->last_selected_window
4894 = selected_window;
4896 if (NILP (data->focus_frame)
4897 || (FRAMEP (data->focus_frame)
4898 && FRAME_LIVE_P (XFRAME (data->focus_frame))))
4899 Fredirect_frame_focus (frame, data->focus_frame);
4901 #if 0 /* I don't understand why this is needed, and it causes problems
4902 when the frame's old selected window has been deleted. */
4903 if (f != selected_frame && FRAME_WINDOW_P (f))
4904 do_switch_frame (WINDOW_FRAME (XWINDOW (data->root_window)),
4905 Qnil, 0);
4906 #endif
4908 /* Set the screen height to the value it had before this function. */
4909 if (previous_frame_height != FRAME_HEIGHT (f)
4910 || previous_frame_width != FRAME_WIDTH (f))
4911 change_frame_size (f, previous_frame_height, previous_frame_width,
4912 0, 0, 0);
4913 #if defined (HAVE_WINDOW_SYSTEM) || defined (MSDOS)
4914 if (previous_frame_menu_bar_lines != FRAME_MENU_BAR_LINES (f))
4915 x_set_menu_bar_lines (f, make_number (previous_frame_menu_bar_lines),
4916 make_number (0));
4917 #ifdef HAVE_WINDOW_SYSTEM
4918 if (previous_frame_tool_bar_lines != FRAME_TOOL_BAR_LINES (f))
4919 x_set_tool_bar_lines (f, make_number (previous_frame_tool_bar_lines),
4920 make_number (0));
4921 #endif
4922 #endif
4924 /* Now, free glyph matrices in windows that were not reused. */
4925 for (i = n = 0; i < n_leaf_windows; ++i)
4927 if (NILP (leaf_windows[i]->buffer))
4929 /* Assert it's not reused as a combination. */
4930 xassert (NILP (leaf_windows[i]->hchild)
4931 && NILP (leaf_windows[i]->vchild));
4932 free_window_matrices (leaf_windows[i]);
4934 else if (EQ (leaf_windows[i]->buffer, new_current_buffer))
4935 ++n;
4938 /* If more than one window shows the new and old current buffer,
4939 don't try to preserve point in that buffer. */
4940 if (old_point > 0 && n > 1)
4941 old_point = -1;
4943 adjust_glyphs (f);
4945 UNBLOCK_INPUT;
4947 /* Fselect_window will have made f the selected frame, so we
4948 reselect the proper frame here. Fhandle_switch_frame will change the
4949 selected window too, but that doesn't make the call to
4950 Fselect_window above totally superfluous; it still sets f's
4951 selected window. */
4952 if (FRAME_LIVE_P (XFRAME (data->selected_frame)))
4953 do_switch_frame (data->selected_frame, Qnil, 0);
4955 if (! NILP (Vwindow_configuration_change_hook)
4956 && ! NILP (Vrun_hooks))
4957 call1 (Vrun_hooks, Qwindow_configuration_change_hook);
4960 if (!NILP (new_current_buffer))
4962 Fset_buffer (new_current_buffer);
4964 /* If the buffer that is current now is the same
4965 that was current before setting the window configuration,
4966 don't alter its PT. */
4967 if (old_point >= 0)
4968 SET_PT (old_point);
4971 /* Restore the minimum heights recorded in the configuration. */
4972 window_min_height = XINT (data->min_height);
4973 window_min_width = XINT (data->min_width);
4975 Vminibuf_scroll_window = data->minibuf_scroll_window;
4977 return (FRAME_LIVE_P (f) ? Qt : Qnil);
4980 /* Mark all windows now on frame as deleted
4981 by setting their buffers to nil. */
4983 void
4984 delete_all_subwindows (w)
4985 register struct window *w;
4987 if (!NILP (w->next))
4988 delete_all_subwindows (XWINDOW (w->next));
4989 if (!NILP (w->vchild))
4990 delete_all_subwindows (XWINDOW (w->vchild));
4991 if (!NILP (w->hchild))
4992 delete_all_subwindows (XWINDOW (w->hchild));
4994 w->height = w->buffer; /* See Fset_window_configuration for excuse. */
4996 if (!NILP (w->buffer))
4997 unshow_buffer (w);
4999 /* We set all three of these fields to nil, to make sure that we can
5000 distinguish this dead window from any live window. Live leaf
5001 windows will have buffer set, and combination windows will have
5002 vchild or hchild set. */
5003 w->buffer = Qnil;
5004 w->vchild = Qnil;
5005 w->hchild = Qnil;
5007 Vwindow_list = Qnil;
5010 static int
5011 count_windows (window)
5012 register struct window *window;
5014 register int count = 1;
5015 if (!NILP (window->next))
5016 count += count_windows (XWINDOW (window->next));
5017 if (!NILP (window->vchild))
5018 count += count_windows (XWINDOW (window->vchild));
5019 if (!NILP (window->hchild))
5020 count += count_windows (XWINDOW (window->hchild));
5021 return count;
5025 /* Fill vector FLAT with leaf windows under W, starting at index I.
5026 Value is last index + 1. */
5028 static int
5029 get_leaf_windows (w, flat, i)
5030 struct window *w;
5031 struct window **flat;
5032 int i;
5034 while (w)
5036 if (!NILP (w->hchild))
5037 i = get_leaf_windows (XWINDOW (w->hchild), flat, i);
5038 else if (!NILP (w->vchild))
5039 i = get_leaf_windows (XWINDOW (w->vchild), flat, i);
5040 else
5041 flat[i++] = w;
5043 w = NILP (w->next) ? 0 : XWINDOW (w->next);
5046 return i;
5050 /* Return a pointer to the glyph W's physical cursor is on. Value is
5051 null if W's current matrix is invalid, so that no meaningfull glyph
5052 can be returned. */
5054 struct glyph *
5055 get_phys_cursor_glyph (w)
5056 struct window *w;
5058 struct glyph_row *row;
5059 struct glyph *glyph;
5061 if (w->phys_cursor.vpos >= 0
5062 && w->phys_cursor.vpos < w->current_matrix->nrows
5063 && (row = MATRIX_ROW (w->current_matrix, w->phys_cursor.vpos),
5064 row->enabled_p)
5065 && row->used[TEXT_AREA] > w->phys_cursor.hpos)
5066 glyph = row->glyphs[TEXT_AREA] + w->phys_cursor.hpos;
5067 else
5068 glyph = NULL;
5070 return glyph;
5074 static int
5075 save_window_save (window, vector, i)
5076 Lisp_Object window;
5077 struct Lisp_Vector *vector;
5078 int i;
5080 register struct saved_window *p;
5081 register struct window *w;
5082 register Lisp_Object tem;
5084 for (;!NILP (window); window = w->next)
5086 p = SAVED_WINDOW_N (vector, i);
5087 w = XWINDOW (window);
5089 XSETFASTINT (w->temslot, i++);
5090 p->window = window;
5091 p->buffer = w->buffer;
5092 p->left = w->left;
5093 p->top = w->top;
5094 p->width = w->width;
5095 p->height = w->height;
5096 p->hscroll = w->hscroll;
5097 p->min_hscroll = w->min_hscroll;
5098 p->display_table = w->display_table;
5099 p->orig_top = w->orig_top;
5100 p->orig_height = w->orig_height;
5101 if (!NILP (w->buffer))
5103 /* Save w's value of point in the window configuration.
5104 If w is the selected window, then get the value of point
5105 from the buffer; pointm is garbage in the selected window. */
5106 if (EQ (window, selected_window))
5108 p->pointm = Fmake_marker ();
5109 set_marker_both (p->pointm, w->buffer,
5110 BUF_PT (XBUFFER (w->buffer)),
5111 BUF_PT_BYTE (XBUFFER (w->buffer)));
5113 else
5114 p->pointm = Fcopy_marker (w->pointm, Qnil);
5116 p->start = Fcopy_marker (w->start, Qnil);
5117 p->start_at_line_beg = w->start_at_line_beg;
5119 tem = XBUFFER (w->buffer)->mark;
5120 p->mark = Fcopy_marker (tem, Qnil);
5122 else
5124 p->pointm = Qnil;
5125 p->start = Qnil;
5126 p->mark = Qnil;
5127 p->start_at_line_beg = Qnil;
5130 if (NILP (w->parent))
5131 p->parent = Qnil;
5132 else
5133 p->parent = XWINDOW (w->parent)->temslot;
5135 if (NILP (w->prev))
5136 p->prev = Qnil;
5137 else
5138 p->prev = XWINDOW (w->prev)->temslot;
5140 if (!NILP (w->vchild))
5141 i = save_window_save (w->vchild, vector, i);
5142 if (!NILP (w->hchild))
5143 i = save_window_save (w->hchild, vector, i);
5146 return i;
5149 DEFUN ("current-window-configuration", Fcurrent_window_configuration,
5150 Scurrent_window_configuration, 0, 1, 0,
5151 "Return an object representing the current window configuration of FRAME.\n\
5152 If FRAME is nil or omitted, use the selected frame.\n\
5153 This describes the number of windows, their sizes and current buffers,\n\
5154 and for each displayed buffer, where display starts, and the positions of\n\
5155 point and mark. An exception is made for point in the current buffer:\n\
5156 its value is -not- saved.\n\
5157 This also records the currently selected frame, and FRAME's focus\n\
5158 redirection (see `redirect-frame-focus').")
5159 (frame)
5160 Lisp_Object frame;
5162 register Lisp_Object tem;
5163 register int n_windows;
5164 register struct save_window_data *data;
5165 register struct Lisp_Vector *vec;
5166 register int i;
5167 FRAME_PTR f;
5169 if (NILP (frame))
5170 frame = selected_frame;
5171 CHECK_LIVE_FRAME (frame, 0);
5172 f = XFRAME (frame);
5174 n_windows = count_windows (XWINDOW (FRAME_ROOT_WINDOW (f)));
5175 vec = allocate_vectorlike (VECSIZE (struct save_window_data));
5176 for (i = 0; i < VECSIZE (struct save_window_data); i++)
5177 vec->contents[i] = Qnil;
5178 vec->size = VECSIZE (struct save_window_data);
5179 data = (struct save_window_data *)vec;
5181 XSETFASTINT (data->frame_width, FRAME_WIDTH (f));
5182 XSETFASTINT (data->frame_height, FRAME_HEIGHT (f));
5183 XSETFASTINT (data->frame_menu_bar_lines, FRAME_MENU_BAR_LINES (f));
5184 XSETFASTINT (data->frame_tool_bar_lines, FRAME_TOOL_BAR_LINES (f));
5185 data->selected_frame = selected_frame;
5186 data->current_window = FRAME_SELECTED_WINDOW (f);
5187 XSETBUFFER (data->current_buffer, current_buffer);
5188 data->minibuf_scroll_window = Vminibuf_scroll_window;
5189 data->root_window = FRAME_ROOT_WINDOW (f);
5190 data->focus_frame = FRAME_FOCUS_FRAME (f);
5191 XSETINT (data->min_height, window_min_height);
5192 XSETINT (data->min_width, window_min_width);
5193 tem = Fmake_vector (make_number (n_windows), Qnil);
5194 data->saved_windows = tem;
5195 for (i = 0; i < n_windows; i++)
5196 XVECTOR (tem)->contents[i]
5197 = Fmake_vector (make_number (SAVED_WINDOW_VECTOR_SIZE), Qnil);
5198 save_window_save (FRAME_ROOT_WINDOW (f), XVECTOR (tem), 0);
5199 XSETWINDOW_CONFIGURATION (tem, data);
5200 return (tem);
5203 DEFUN ("save-window-excursion", Fsave_window_excursion, Ssave_window_excursion,
5204 0, UNEVALLED, 0,
5205 "Execute body, preserving window sizes and contents.\n\
5206 Restore which buffer appears in which window, where display starts,\n\
5207 and the value of point and mark for each window.\n\
5208 Also restore the choice of selected window.\n\
5209 Also restore which buffer is current.\n\
5210 Does not restore the value of point in current buffer.")
5211 (args)
5212 Lisp_Object args;
5214 register Lisp_Object val;
5215 register int count = specpdl_ptr - specpdl;
5217 record_unwind_protect (Fset_window_configuration,
5218 Fcurrent_window_configuration (Qnil));
5219 val = Fprogn (args);
5220 return unbind_to (count, val);
5224 /***********************************************************************
5225 Marginal Areas
5226 ***********************************************************************/
5228 DEFUN ("set-window-margins", Fset_window_margins, Sset_window_margins,
5229 2, 3, 0,
5230 "Set width of marginal areas of window WINDOW.\n\
5231 If window is nil, set margins of the currently selected window.\n\
5232 First parameter LEFT-WIDTH specifies the number of character\n\
5233 cells to reserve for the left marginal area. Second parameter\n\
5234 RIGHT-WIDTH does the same for the right marginal area.\n\
5235 A nil width parameter means no margin.")
5236 (window, left, right)
5237 Lisp_Object window, left, right;
5239 struct window *w = decode_window (window);
5241 if (!NILP (left))
5242 CHECK_NUMBER_OR_FLOAT (left, 1);
5243 if (!NILP (right))
5244 CHECK_NUMBER_OR_FLOAT (right, 2);
5246 /* Check widths < 0 and translate a zero width to nil.
5247 Margins that are too wide have to be checked elsewhere. */
5248 if ((INTEGERP (left) && XINT (left) < 0)
5249 || (FLOATP (left) && XFLOAT_DATA (left) <= 0))
5250 XSETFASTINT (left, 0);
5251 if (INTEGERP (left) && XFASTINT (left) == 0)
5252 left = Qnil;
5254 if ((INTEGERP (right) && XINT (right) < 0)
5255 || (FLOATP (right) && XFLOAT_DATA (right) <= 0))
5256 XSETFASTINT (right, 0);
5257 if (INTEGERP (right) && XFASTINT (right) == 0)
5258 right = Qnil;
5260 w->left_margin_width = left;
5261 w->right_margin_width = right;
5263 ++windows_or_buffers_changed;
5264 adjust_glyphs (XFRAME (WINDOW_FRAME (w)));
5265 return Qnil;
5269 DEFUN ("window-margins", Fwindow_margins, Swindow_margins,
5270 0, 1, 0,
5271 "Get width of marginal areas of window WINDOW.\n\
5272 If WINDOW is omitted or nil, use the currently selected window.\n\
5273 Value is a cons of the form (LEFT-WIDTH . RIGHT-WIDTH).\n\
5274 If a marginal area does not exist, its width will be returned\n\
5275 as nil.")
5276 (window)
5277 Lisp_Object window;
5279 struct window *w = decode_window (window);
5280 return Fcons (w->left_margin_width, w->right_margin_width);
5285 /***********************************************************************
5286 Smooth scrolling
5287 ***********************************************************************/
5289 DEFUN ("window-vscroll", Fwindow_vscroll, Swindow_vscroll, 0, 1, 0,
5290 "Return the amount by which WINDOW is scrolled vertically.\n\
5291 Use the selected window if WINDOW is nil or omitted.\n\
5292 Value is a multiple of the canonical character height of WINDOW.")
5293 (window)
5294 Lisp_Object window;
5296 Lisp_Object result;
5297 struct frame *f;
5298 struct window *w;
5300 if (NILP (window))
5301 window = selected_window;
5302 else
5303 CHECK_WINDOW (window, 0);
5304 w = XWINDOW (window);
5305 f = XFRAME (w->frame);
5307 if (FRAME_WINDOW_P (f))
5308 result = CANON_Y_FROM_PIXEL_Y (f, -w->vscroll);
5309 else
5310 result = make_number (0);
5311 return result;
5315 DEFUN ("set-window-vscroll", Fset_window_vscroll, Sset_window_vscroll,
5316 2, 2, 0,
5317 "Set amount by which WINDOW should be scrolled vertically to VSCROLL.\n\
5318 WINDOW nil or omitted means use the selected window. VSCROLL is a\n\
5319 non-negative multiple of the canonical character height of WINDOW.")
5320 (window, vscroll)
5321 Lisp_Object window, vscroll;
5323 struct window *w;
5324 struct frame *f;
5326 if (NILP (window))
5327 window = selected_window;
5328 else
5329 CHECK_WINDOW (window, 0);
5330 CHECK_NUMBER_OR_FLOAT (vscroll, 1);
5332 w = XWINDOW (window);
5333 f = XFRAME (w->frame);
5335 if (FRAME_WINDOW_P (f))
5337 int old_dy = w->vscroll;
5339 w->vscroll = - CANON_Y_UNIT (f) * XFLOATINT (vscroll);
5340 w->vscroll = min (w->vscroll, 0);
5342 /* Adjust glyph matrix of the frame if the virtual display
5343 area becomes larger than before. */
5344 if (w->vscroll < 0 && w->vscroll < old_dy)
5345 adjust_glyphs (f);
5347 /* Prevent redisplay shortcuts. */
5348 XBUFFER (w->buffer)->prevent_redisplay_optimizations_p = 1;
5351 return Fwindow_vscroll (window);
5355 /* Call FN for all leaf windows on frame F. FN is called with the
5356 first argument being a pointer to the leaf window, and with
5357 additional argument USER_DATA. Stops when FN returns 0. */
5359 void
5360 foreach_window (f, fn, user_data)
5361 struct frame *f;
5362 int (* fn) P_ ((struct window *, void *));
5363 void *user_data;
5365 foreach_window_1 (XWINDOW (FRAME_ROOT_WINDOW (f)), fn, user_data);
5369 /* Helper function for foreach_window. Call FN for all leaf windows
5370 reachable from W. FN is called with the first argument being a
5371 pointer to the leaf window, and with additional argument USER_DATA.
5372 Stop when FN returns 0. Value is 0 if stopped by FN. */
5374 static int
5375 foreach_window_1 (w, fn, user_data)
5376 struct window *w;
5377 int (* fn) P_ ((struct window *, void *));
5378 void *user_data;
5380 int cont;
5382 for (cont = 1; w && cont;)
5384 if (!NILP (w->hchild))
5385 cont = foreach_window_1 (XWINDOW (w->hchild), fn, user_data);
5386 else if (!NILP (w->vchild))
5387 cont = foreach_window_1 (XWINDOW (w->vchild), fn, user_data);
5388 else
5389 cont = fn (w, user_data);
5391 w = NILP (w->next) ? 0 : XWINDOW (w->next);
5394 return cont;
5398 /* Freeze or unfreeze the window start of W if unless it is a
5399 mini-window or the selected window. FREEZE_P non-null means freeze
5400 the window start. */
5402 static int
5403 freeze_window_start (w, freeze_p)
5404 struct window *w;
5405 void *freeze_p;
5407 if (w == XWINDOW (selected_window)
5408 || MINI_WINDOW_P (w)
5409 || (MINI_WINDOW_P (XWINDOW (selected_window))
5410 && ! NILP (Vminibuf_scroll_window)
5411 && w == XWINDOW (Vminibuf_scroll_window)))
5412 freeze_p = NULL;
5414 w->frozen_window_start_p = freeze_p != NULL;
5415 return 1;
5419 /* Freeze or unfreeze the window starts of all leaf windows on frame
5420 F, except the selected window and a mini-window. FREEZE_P non-zero
5421 means freeze the window start. */
5423 void
5424 freeze_window_starts (f, freeze_p)
5425 struct frame *f;
5426 int freeze_p;
5428 foreach_window (f, freeze_window_start, (void *) (freeze_p ? f : 0));
5432 /***********************************************************************
5433 Initialization
5434 ***********************************************************************/
5436 /* Return 1 if window configurations C1 and C2
5437 describe the same state of affairs. This is used by Fequal. */
5440 compare_window_configurations (c1, c2, ignore_positions)
5441 Lisp_Object c1, c2;
5442 int ignore_positions;
5444 register struct save_window_data *d1, *d2;
5445 struct Lisp_Vector *sw1, *sw2;
5446 int i;
5448 if (!WINDOW_CONFIGURATIONP (c1))
5449 wrong_type_argument (Qwindow_configuration_p, c1);
5450 if (!WINDOW_CONFIGURATIONP (c2))
5451 wrong_type_argument (Qwindow_configuration_p, c2);
5453 d1 = (struct save_window_data *) XVECTOR (c1);
5454 d2 = (struct save_window_data *) XVECTOR (c2);
5455 sw1 = XVECTOR (d1->saved_windows);
5456 sw2 = XVECTOR (d2->saved_windows);
5458 if (! EQ (d1->frame_width, d2->frame_width))
5459 return 0;
5460 if (! EQ (d1->frame_height, d2->frame_height))
5461 return 0;
5462 if (! EQ (d1->frame_menu_bar_lines, d2->frame_menu_bar_lines))
5463 return 0;
5464 if (! EQ (d1->selected_frame, d2->selected_frame))
5465 return 0;
5466 /* Don't compare the current_window field directly.
5467 Instead see w1_is_current and w2_is_current, below. */
5468 if (! EQ (d1->current_buffer, d2->current_buffer))
5469 return 0;
5470 if (! ignore_positions)
5471 if (! EQ (d1->minibuf_scroll_window, d2->minibuf_scroll_window))
5472 return 0;
5473 /* Don't compare the root_window field.
5474 We don't require the two configurations
5475 to use the same window object,
5476 and the two root windows must be equivalent
5477 if everything else compares equal. */
5478 if (! EQ (d1->focus_frame, d2->focus_frame))
5479 return 0;
5480 if (! EQ (d1->min_width, d2->min_width))
5481 return 0;
5482 if (! EQ (d1->min_height, d2->min_height))
5483 return 0;
5485 /* Verify that the two confis have the same number of windows. */
5486 if (sw1->size != sw2->size)
5487 return 0;
5489 for (i = 0; i < sw1->size; i++)
5491 struct saved_window *p1, *p2;
5492 int w1_is_current, w2_is_current;
5494 p1 = SAVED_WINDOW_N (sw1, i);
5495 p2 = SAVED_WINDOW_N (sw2, i);
5497 /* Verify that the current windows in the two
5498 configurations correspond to each other. */
5499 w1_is_current = EQ (d1->current_window, p1->window);
5500 w2_is_current = EQ (d2->current_window, p2->window);
5502 if (w1_is_current != w2_is_current)
5503 return 0;
5505 /* Verify that the corresponding windows do match. */
5506 if (! EQ (p1->buffer, p2->buffer))
5507 return 0;
5508 if (! EQ (p1->left, p2->left))
5509 return 0;
5510 if (! EQ (p1->top, p2->top))
5511 return 0;
5512 if (! EQ (p1->width, p2->width))
5513 return 0;
5514 if (! EQ (p1->height, p2->height))
5515 return 0;
5516 if (! EQ (p1->display_table, p2->display_table))
5517 return 0;
5518 if (! EQ (p1->parent, p2->parent))
5519 return 0;
5520 if (! EQ (p1->prev, p2->prev))
5521 return 0;
5522 if (! ignore_positions)
5524 if (! EQ (p1->hscroll, p2->hscroll))
5525 return 0;
5526 if (!EQ (p1->min_hscroll, p2->min_hscroll))
5527 return 0;
5528 if (! EQ (p1->start_at_line_beg, p2->start_at_line_beg))
5529 return 0;
5530 if (NILP (Fequal (p1->start, p2->start)))
5531 return 0;
5532 if (NILP (Fequal (p1->pointm, p2->pointm)))
5533 return 0;
5534 if (NILP (Fequal (p1->mark, p2->mark)))
5535 return 0;
5539 return 1;
5542 DEFUN ("compare-window-configurations", Fcompare_window_configurations,
5543 Scompare_window_configurations, 2, 2, 0,
5544 "Compare two window configurations as regards the structure of windows.\n\
5545 This function ignores details such as the values of point and mark\n\
5546 and scrolling positions.")
5547 (x, y)
5548 Lisp_Object x, y;
5550 if (compare_window_configurations (x, y, 1))
5551 return Qt;
5552 return Qnil;
5555 void
5556 init_window_once ()
5558 struct frame *f = make_terminal_frame ();
5559 XSETFRAME (selected_frame, f);
5560 Vterminal_frame = selected_frame;
5561 minibuf_window = f->minibuffer_window;
5562 selected_window = f->selected_window;
5563 last_nonminibuf_frame = f;
5565 window_initialized = 1;
5568 void
5569 init_window ()
5571 Vwindow_list = Qnil;
5574 void
5575 syms_of_window ()
5577 Qleft_bitmap_area = intern ("left-bitmap-area");
5578 staticpro (&Qleft_bitmap_area);
5579 Qright_bitmap_area = intern ("right-bitmap-area");
5580 staticpro (&Qright_bitmap_area);
5582 Qwindow_size_fixed = intern ("window-size-fixed");
5583 staticpro (&Qwindow_size_fixed);
5585 staticpro (&Qwindow_configuration_change_hook);
5586 Qwindow_configuration_change_hook
5587 = intern ("window-configuration-change-hook");
5589 Qwindowp = intern ("windowp");
5590 staticpro (&Qwindowp);
5592 Qwindow_configuration_p = intern ("window-configuration-p");
5593 staticpro (&Qwindow_configuration_p);
5595 Qwindow_live_p = intern ("window-live-p");
5596 staticpro (&Qwindow_live_p);
5598 Qtemp_buffer_show_hook = intern ("temp-buffer-show-hook");
5599 staticpro (&Qtemp_buffer_show_hook);
5601 staticpro (&Vwindow_list);
5603 DEFVAR_LISP ("temp-buffer-show-function", &Vtemp_buffer_show_function,
5604 "Non-nil means call as function to display a help buffer.\n\
5605 The function is called with one argument, the buffer to be displayed.\n\
5606 Used by `with-output-to-temp-buffer'.\n\
5607 If this function is used, then it must do the entire job of showing\n\
5608 the buffer; `temp-buffer-show-hook' is not run unless this function runs it.");
5609 Vtemp_buffer_show_function = Qnil;
5611 DEFVAR_LISP ("display-buffer-function", &Vdisplay_buffer_function,
5612 "If non-nil, function to call to handle `display-buffer'.\n\
5613 It will receive two args, the buffer and a flag which if non-nil means\n\
5614 that the currently selected window is not acceptable.\n\
5615 Commands such as `switch-to-buffer-other-window' and `find-file-other-window'\n\
5616 work using this function.");
5617 Vdisplay_buffer_function = Qnil;
5619 DEFVAR_LISP ("even-window-heights", &Veven_window_heights,
5620 "*If non-nil, `display-buffer' should even the window heights.\n\
5621 If nil, `display-buffer' will leave the window configuration alone.");
5622 Veven_window_heights = Qt;
5624 DEFVAR_LISP ("minibuffer-scroll-window", &Vminibuf_scroll_window,
5625 "Non-nil means it is the window that C-M-v in minibuffer should scroll.");
5626 Vminibuf_scroll_window = Qnil;
5628 DEFVAR_LISP ("other-window-scroll-buffer", &Vother_window_scroll_buffer,
5629 "If non-nil, this is a buffer and \\[scroll-other-window] should scroll its window.");
5630 Vother_window_scroll_buffer = Qnil;
5632 DEFVAR_BOOL ("pop-up-frames", &pop_up_frames,
5633 "*Non-nil means `display-buffer' should make a separate frame.");
5634 pop_up_frames = 0;
5636 DEFVAR_BOOL ("display-buffer-reuse-frames", &display_buffer_reuse_frames,
5637 "*Non-nil means `display-buffer' should reuse frames.\n\
5638 If the buffer in question is already displayed in a frame, raise that frame.");
5639 display_buffer_reuse_frames = 0;
5641 DEFVAR_LISP ("pop-up-frame-function", &Vpop_up_frame_function,
5642 "Function to call to handle automatic new frame creation.\n\
5643 It is called with no arguments and should return a newly created frame.\n\
5645 A typical value might be `(lambda () (new-frame pop-up-frame-alist))'\n\
5646 where `pop-up-frame-alist' would hold the default frame parameters.");
5647 Vpop_up_frame_function = Qnil;
5649 DEFVAR_LISP ("special-display-buffer-names", &Vspecial_display_buffer_names,
5650 "*List of buffer names that should have their own special frames.\n\
5651 Displaying a buffer whose name is in this list makes a special frame for it\n\
5652 using `special-display-function'. See also `special-display-regexps'.\n\
5654 An element of the list can be a list instead of just a string.\n\
5655 There are two ways to use a list as an element:\n\
5656 (BUFFER FRAME-PARAMETERS...) (BUFFER FUNCTION OTHER-ARGS...)\n\
5657 In the first case, FRAME-PARAMETERS are used to create the frame.\n\
5658 In the latter case, FUNCTION is called with BUFFER as the first argument,\n\
5659 followed by OTHER-ARGS--it can display BUFFER in any way it likes.\n\
5660 All this is done by the function found in `special-display-function'.\n\
5662 If this variable appears \"not to work\", because you add a name to it\n\
5663 but that buffer still appears in the selected window, look at the\n\
5664 values of `same-window-buffer-names' and `same-window-regexps'.\n\
5665 Those variables take precedence over this one.");
5666 Vspecial_display_buffer_names = Qnil;
5668 DEFVAR_LISP ("special-display-regexps", &Vspecial_display_regexps,
5669 "*List of regexps saying which buffers should have their own special frames.\n\
5670 If a buffer name matches one of these regexps, it gets its own frame.\n\
5671 Displaying a buffer whose name is in this list makes a special frame for it\n\
5672 using `special-display-function'.\n\
5674 An element of the list can be a list instead of just a string.\n\
5675 There are two ways to use a list as an element:\n\
5676 (REGEXP FRAME-PARAMETERS...) (REGEXP FUNCTION OTHER-ARGS...)\n\
5677 In the first case, FRAME-PARAMETERS are used to create the frame.\n\
5678 In the latter case, FUNCTION is called with the buffer as first argument,\n\
5679 followed by OTHER-ARGS--it can display the buffer in any way it likes.\n\
5680 All this is done by the function found in `special-display-function'.\n\
5682 If this variable appears \"not to work\", because you add a regexp to it\n\
5683 but the matching buffers still appear in the selected window, look at the\n\
5684 values of `same-window-buffer-names' and `same-window-regexps'.\n\
5685 Those variables take precedence over this one.");
5686 Vspecial_display_regexps = Qnil;
5688 DEFVAR_LISP ("special-display-function", &Vspecial_display_function,
5689 "Function to call to make a new frame for a special buffer.\n\
5690 It is called with two arguments, the buffer and optional buffer specific\n\
5691 data, and should return a window displaying that buffer.\n\
5692 The default value makes a separate frame for the buffer,\n\
5693 using `special-display-frame-alist' to specify the frame parameters.\n\
5695 A buffer is special if its is listed in `special-display-buffer-names'\n\
5696 or matches a regexp in `special-display-regexps'.");
5697 Vspecial_display_function = Qnil;
5699 DEFVAR_LISP ("same-window-buffer-names", &Vsame_window_buffer_names,
5700 "*List of buffer names that should appear in the selected window.\n\
5701 Displaying one of these buffers using `display-buffer' or `pop-to-buffer'\n\
5702 switches to it in the selected window, rather than making it appear\n\
5703 in some other window.\n\
5705 An element of the list can be a cons cell instead of just a string.\n\
5706 Then the car must be a string, which specifies the buffer name.\n\
5707 This is for compatibility with `special-display-buffer-names';\n\
5708 the cdr of the cons cell is ignored.\n\
5710 See also `same-window-regexps'.");
5711 Vsame_window_buffer_names = Qnil;
5713 DEFVAR_LISP ("same-window-regexps", &Vsame_window_regexps,
5714 "*List of regexps saying which buffers should appear in the selected window.\n\
5715 If a buffer name matches one of these regexps, then displaying it\n\
5716 using `display-buffer' or `pop-to-buffer' switches to it\n\
5717 in the selected window, rather than making it appear in some other window.\n\
5719 An element of the list can be a cons cell instead of just a string.\n\
5720 Then the car must be a string, which specifies the buffer name.\n\
5721 This is for compatibility with `special-display-buffer-names';\n\
5722 the cdr of the cons cell is ignored.\n\
5724 See also `same-window-buffer-names'.");
5725 Vsame_window_regexps = Qnil;
5727 DEFVAR_BOOL ("pop-up-windows", &pop_up_windows,
5728 "*Non-nil means display-buffer should make new windows.");
5729 pop_up_windows = 1;
5731 DEFVAR_INT ("next-screen-context-lines", &next_screen_context_lines,
5732 "*Number of lines of continuity when scrolling by screenfuls.");
5733 next_screen_context_lines = 2;
5735 DEFVAR_INT ("split-height-threshold", &split_height_threshold,
5736 "*display-buffer would prefer to split the largest window if this large.\n\
5737 If there is only one window, it is split regardless of this value.");
5738 split_height_threshold = 500;
5740 DEFVAR_INT ("window-min-height", &window_min_height,
5741 "*Delete any window less than this tall (including its mode line).");
5742 window_min_height = 4;
5744 DEFVAR_INT ("window-min-width", &window_min_width,
5745 "*Delete any window less than this wide.");
5746 window_min_width = 10;
5748 DEFVAR_LISP ("scroll-preserve-screen-position",
5749 &Vscroll_preserve_screen_position,
5750 "*Nonzero means scroll commands move point to keep its screen line unchanged.");
5751 Vscroll_preserve_screen_position = Qnil;
5753 DEFVAR_LISP ("window-configuration-change-hook",
5754 &Vwindow_configuration_change_hook,
5755 "Functions to call when window configuration changes.\n\
5756 The selected frame is the one whose configuration has changed.");
5757 Vwindow_configuration_change_hook = Qnil;
5759 defsubr (&Sselected_window);
5760 defsubr (&Sminibuffer_window);
5761 defsubr (&Swindow_minibuffer_p);
5762 defsubr (&Swindowp);
5763 defsubr (&Swindow_live_p);
5764 defsubr (&Spos_visible_in_window_p);
5765 defsubr (&Swindow_buffer);
5766 defsubr (&Swindow_height);
5767 defsubr (&Swindow_width);
5768 defsubr (&Swindow_hscroll);
5769 defsubr (&Sset_window_hscroll);
5770 defsubr (&Swindow_redisplay_end_trigger);
5771 defsubr (&Sset_window_redisplay_end_trigger);
5772 defsubr (&Swindow_edges);
5773 defsubr (&Scoordinates_in_window_p);
5774 defsubr (&Swindow_at);
5775 defsubr (&Swindow_point);
5776 defsubr (&Swindow_start);
5777 defsubr (&Swindow_end);
5778 defsubr (&Sset_window_point);
5779 defsubr (&Sset_window_start);
5780 defsubr (&Swindow_dedicated_p);
5781 defsubr (&Sset_window_dedicated_p);
5782 defsubr (&Swindow_display_table);
5783 defsubr (&Sset_window_display_table);
5784 defsubr (&Snext_window);
5785 defsubr (&Sprevious_window);
5786 defsubr (&Sother_window);
5787 defsubr (&Sget_lru_window);
5788 defsubr (&Sget_largest_window);
5789 defsubr (&Sget_buffer_window);
5790 defsubr (&Sdelete_other_windows);
5791 defsubr (&Sdelete_windows_on);
5792 defsubr (&Sreplace_buffer_in_windows);
5793 defsubr (&Sdelete_window);
5794 defsubr (&Sset_window_buffer);
5795 defsubr (&Sselect_window);
5796 defsubr (&Sspecial_display_p);
5797 defsubr (&Ssame_window_p);
5798 defsubr (&Sdisplay_buffer);
5799 defsubr (&Ssplit_window);
5800 defsubr (&Senlarge_window);
5801 defsubr (&Sshrink_window);
5802 defsubr (&Sscroll_up);
5803 defsubr (&Sscroll_down);
5804 defsubr (&Sscroll_left);
5805 defsubr (&Sscroll_right);
5806 defsubr (&Sother_window_for_scrolling);
5807 defsubr (&Sscroll_other_window);
5808 defsubr (&Srecenter);
5809 defsubr (&Swindow_text_height);
5810 defsubr (&Smove_to_window_line);
5811 defsubr (&Swindow_configuration_p);
5812 defsubr (&Swindow_configuration_frame);
5813 defsubr (&Sset_window_configuration);
5814 defsubr (&Scurrent_window_configuration);
5815 defsubr (&Ssave_window_excursion);
5816 defsubr (&Sset_window_margins);
5817 defsubr (&Swindow_margins);
5818 defsubr (&Swindow_vscroll);
5819 defsubr (&Sset_window_vscroll);
5820 defsubr (&Scompare_window_configurations);
5821 defsubr (&Swindow_list);
5824 void
5825 keys_of_window ()
5827 initial_define_key (control_x_map, '1', "delete-other-windows");
5828 initial_define_key (control_x_map, '2', "split-window");
5829 initial_define_key (control_x_map, '0', "delete-window");
5830 initial_define_key (control_x_map, 'o', "other-window");
5831 initial_define_key (control_x_map, '^', "enlarge-window");
5832 initial_define_key (control_x_map, '<', "scroll-left");
5833 initial_define_key (control_x_map, '>', "scroll-right");
5835 initial_define_key (global_map, Ctl ('V'), "scroll-up");
5836 initial_define_key (meta_map, Ctl ('V'), "scroll-other-window");
5837 initial_define_key (meta_map, 'v', "scroll-down");
5839 initial_define_key (global_map, Ctl('L'), "recenter");
5840 initial_define_key (meta_map, 'r', "move-to-window-line");