| blob | 26d29db499349ce9688058c601c01f95ad4eda07 |
1 ;;; window.el --- GNU Emacs window commands aside from those written in C
3 ;; Copyright (C) 1985, 1989, 1992-1994, 2000-2011
4 ;; Free Software Foundation, Inc.
6 ;; Maintainer: FSF
7 ;; Keywords: internal
8 ;; Package: emacs
10 ;; This file is part of GNU Emacs.
12 ;; GNU Emacs is free software: you can redistribute it and/or modify
13 ;; it under the terms of the GNU General Public License as published by
14 ;; the Free Software Foundation, either version 3 of the License, or
15 ;; (at your option) any later version.
17 ;; GNU Emacs is distributed in the hope that it will be useful,
18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 ;; GNU General Public License for more details.
22 ;; You should have received a copy of the GNU General Public License
23 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
25 ;;; Commentary:
27 ;; Window tree functions.
29 ;;; Code:
34 "Execute BODY, then select the previously selected window.
35 The value returned is the value of the last form in BODY.
37 This macro saves and restores the selected window, as well as the
38 selected window in each frame. If the previously selected window
39 is no longer live, then whatever window is selected at the end of
40 BODY remains selected. If the previously selected window of some
41 frame is no longer live at the end of BODY, that frame's selected
42 window is left alone.
44 This macro saves and restores the current buffer, since otherwise
45 its normal operation could make a different buffer current. The
46 order of recently selected windows and the buffer list ordering
47 are not altered by this macro (unless they are altered in BODY)."
50 ;; It is necessary to save all of these, because calling
51 ;; select-window changes frame-selected-window for whatever
52 ;; frame that window is in.
66 ;; The following two functions are like `window-next-sibling' and
67 ;; `window-prev-sibling' but the WINDOW argument is _not_ optional (so
68 ;; they don't substitute the selected window for nil), and they return
69 ;; nil when WINDOW doesn't have a parent (like a frame's root window or
70 ;; a minibuffer window).
72 "Return WINDOW's right sibling.
73 Return nil if WINDOW is the root window of its frame. WINDOW can
74 be any window."
78 "Return WINDOW's left sibling.
79 Return nil if WINDOW is the root window of its frame. WINDOW can
80 be any window."
84 "Return WINDOW's first child window."
88 "Return number of WINDOW's child windows."
94 count))
97 "Return last child window of WINDOW."
101 window)
104 "Return t if OBJECT denotes a live or internal window."
107 t))
110 "Return buffer specified by BUFFER-OR-NAME.
111 BUFFER-OR-NAME must be either a buffer or a string naming a live
112 buffer and defaults to the current buffer."
118 buffer-or-name
125 "Return frame specified by FRAME.
126 FRAME must be a live frame and defaults to the selected frame."
129 frame
134 "Return window specified by WINDOW.
135 WINDOW must be a window that has not been deleted and defaults to
136 the selected window."
139 window
144 "Return live window specified by WINDOW.
145 WINDOW must be a live window and defaults to the selected one."
148 window
153 "If non-nil, standard functions ignore window parameters.
154 The functions currently affected by this are `split-window',
155 `delete-window', `delete-other-windows' and `other-window'.
157 An application may bind this to a non-nil value around calls to
161 "The absolut minimum number of lines of a window.
165 "The minimum number of lines of any window.
166 The value has to accommodate a mode- or header-line if present.
167 A value less than `window-safe-min-height' is ignored. The value
168 of this variable is honored when windows are resized or split.
170 Applications should never rebind this variable. To resize a
171 window to a height less than the one specified here, an
172 application should instead call `window-resize' with a non-nil
173 IGNORE argument. In order to have `split-window' make a window
174 shorter, explictly specify the SIZE argument of that function."
180 "The absolut minimum number of columns of a window.
184 "The minimum number of columns of any window.
185 The value has to accomodate margins, fringes, or scrollbars if
186 present. A value less than `window-safe-min-width' is ignored.
187 The value of this variable is honored when windows are resized or
188 split.
190 Applications should never rebind this variable. To resize a
191 window to a width less than the one specified here, an
192 application should instead call `window-resize' with a non-nil
193 IGNORE argument. In order to have `split-window' make a window
194 narrower, explictly specify the SIZE argument of that function."
200 "If WINDOW is a vertical combination return WINDOW's first child.
201 WINDOW can be any window and defaults to the selected one.
202 Optional argument HORIZONTAL non-nil means return WINDOW's first
203 child if WINDOW is a horizontal combination."
210 "Return non-nil if and only if WINDOW is vertically combined.
211 WINDOW can be any window and defaults to the selected one.
212 Optional argument HORIZONTAL non-nil means return non-nil if and
213 only if WINDOW is horizontally combined."
219 "Return largest number of vertically arranged subwindows of WINDOW.
220 WINDOW can be any window and defaults to the selected one.
221 Optional argument HORIZONTAL non-nil means to return the largest
222 number of horizontally arranged subwindows of WINDOW."
226 ;; If WINDOW is live, return 1.
229 ;; If WINDOW is iso-combined, return the sum of the values for all
230 ;; subwindows of WINDOW.
236 count))
238 count))
240 ;; If WINDOW is not iso-combined, return the maximum value of any
241 ;; subwindow of WINDOW.
247 count))
249 count))))
252 "Helper function for `walk-window-tree' and `walk-window-subtree'."
270 "Run function PROC on each live window of FRAME.
271 PROC must be a function with one argument - a window. FRAME must
272 be a live frame and defaults to the selected one. ANY, if
273 non-nil means to run PROC on all live and internal windows of
274 FRAME.
276 This function performs a pre-order, depth-first traversal of the
277 window tree. If PROC changes the window tree, the result is
278 unpredictable."
284 "Run function PROC on each live subwindow of WINDOW.
285 WINDOW defaults to the selected window. PROC must be a function
286 with one argument - a window. ANY, if non-nil means to run PROC
287 on all live and internal subwindows of WINDOW.
289 This function performs a pre-order, depth-first traversal of the
290 window tree rooted at WINDOW. If PROC changes that window tree,
291 the result is unpredictable."
296 "Return a list of all windows on FRAME with PARAMETER non-nil.
297 FRAME defaults to the selected frame. Optional argument VALUE
298 non-nil means only return windows whose window-parameter value of
299 PARAMETER equals VALUE \(comparison is done using `equal').
300 Optional argument ANY non-nil means consider internal windows
301 too. Optional argument VALUES non-nil means return a list of cons
302 cells whose car is the value of the parameter and whose cdr is
303 the window."
313 frame any)
318 "Return first window on FRAME with PARAMETER non-nil.
319 FRAME defaults to the selected frame. Optional argument VALUE
320 non-nil means only return a window whose window-parameter value
321 for PARAMETER equals VALUE \(comparison is done with `equal').
322 Optional argument ANY non-nil means consider internal windows
323 too."
331 frame any))))
333 ;;; Atomic windows.
335 "Return root of atomic window WINDOW is a part of.
336 WINDOW can be any window and defaults to the selected one.
337 Return nil if WINDOW is not part of a atomic window."
343 root))
346 "Make WINDOW an atomic window.
347 WINDOW must be an internal window. Return WINDOW."
353 window t)
354 window))
357 "Subroutine of `window-atom-check'."
367 window t))
368 ;; count >= 1 must hold here. If there's no other
369 ;; window around dissolve this atomic window.
371 ;; Dissolve atomic window.
375 window t)))
376 ;; Check children.
380 ;; Check right sibling
384 "Check atomicity of all windows on FRAME.
385 FRAME defaults to the selected frame. If an atomic window is
386 wrongly configured, reset the atomicity of all its subwindows to
387 nil. An atomic window is wrongly configured if it has no
388 subwindows or one of its subwindows is not atomic."
391 ;; Side windows.
396 "If non-nil, left and right side windows are full height.
397 Otherwise, top and bottom side windows are full width."
403 "Maximum number of side window slots.
404 The value is a list of four elements specifying the number of
405 side window slots on \(in this order) the left, top, right and
406 bottom side of each frame. If an element is a number, this means
407 to display at most that many side windows on the corresponding
408 side. If an element is nil, this means there's no bound on the
409 number of slots on that side."
410 :risky t
411 :type
417 :value nil
424 :value nil
431 :value nil
438 :value nil
445 "Check the window-side parameter of all windows on FRAME.
446 FRAME defaults to the selected frame. If the configuration is
447 invalid, reset all window-side parameters to nil.
449 A valid configuration has to preserve the following invariant:
451 - If a window has a non-nil window-side parameter, it must have a
452 parent window and the parent window's window-side parameter
453 must be either nil or the same as for window.
455 - If windows with non-nil window-side parameters exist, there
456 must be at most one window of each side and non-side with a
457 parent whose window-side parameter is nil and there must be no
458 leaf window whose window-side parameter is nil."
460 side parent parent-side code)
468 ;; The following `cond' seems a bit tedious, but I'd
469 ;; rather stick to using just the stack.
473 ;; A parent whose window-side is non-nil must
474 ;; have a child with the same window-side.
476 ;; Now check that there's more than one main window
477 ;; for any of none, left, top, right and bottom.
499 ;; A leaf window without window-side parameter,
500 ;; record its existence.
502 frame t))
504 ;; At least one non-side window exists, so there must
505 ;; be at least one side-window and no normal window.
507 ;; No non-side window exists, so there must be no side
508 ;; window either.
513 frame t))))
516 "Check atomic and side windows on FRAME.
517 FRAME defaults to the selected frame."
521 ;;; Window sizes.
523 "Non-nil in a buffer means windows displaying the buffer are fixed-size.
524 If the value is `height', then only the window's height is fixed.
525 If the value is `width', then only the window's width is fixed.
526 Any other non-nil value fixes both the width and the height.
528 Emacs won't change the size of any window displaying that buffer,
529 unless it has no other choice \(like when deleting a neighboring
534 "Return non-nil if IGNORE says to ignore size restrictions for WINDOW."
538 "Return the minimum number of lines of WINDOW.
539 WINDOW can be an arbitrary window and defaults to the selected
540 one. Optional argument HORIZONTAL non-nil means return the
541 minimum number of columns of WINDOW.
543 Optional argument IGNORE non-nil means ignore any restrictions
544 imposed by fixed size windows, `window-min-height' or
545 `window-min-width' settings. IGNORE equal `safe' means live
546 windows may get as small as `window-safe-min-height' lines and
547 `window-safe-min-width' columns. IGNORE a window means ignore
548 restrictions for that window only."
553 "Internal function of `window-min-size'."
557 ;; WINDOW is an internal window.
559 ;; The minimum size of an iso-combination is the sum of
560 ;; the minimum sizes of its subwindows.
565 ;; The minimum size of an ortho-combination is the maximum of
566 ;; the minimum sizes of its subwindows.
571 value)
576 ;; The minimum size of a fixed size window is its size.
579 ;; If IGNORE equals `safe' or WINDOW return the safe values.
582 ;; For the minimum width of a window take fringes and
583 ;; scroll-bars into account. This is questionable and should
584 ;; be removed as soon as we are able to split (and resize)
585 ;; windows such that the new (or resized) windows can get a
586 ;; size less than the user-specified `window-min-height' and
587 ;; `window-min-width'.
592 (+ window-safe-min-width
605 window-min-width
608 ;; For the minimum height of a window take any mode- or
609 ;; header-line into account.
615 window-min-height
619 "Return DELTA if DELTA lines can be added to WINDOW.
620 Optional argument HORIZONTAL non-nil means return DELTA if DELTA
621 columns can be added to WINDOW. A return value of zero means
622 that no lines (or columns) can be added to WINDOW.
624 This function looks only at WINDOW and its subwindows. The
625 function `window-resizable' looks at other windows as well.
627 DELTA positive means WINDOW shall be enlarged by DELTA lines or
628 columns. If WINDOW cannot be enlarged by DELTA lines or columns
629 return the maximum value in the range 0..DELTA by which WINDOW
630 can be enlarged.
632 DELTA negative means WINDOW shall be shrunk by -DELTA lines or
633 columns. If WINDOW cannot be shrunk by -DELTA lines or columns,
634 return the minimum value in the range DELTA..0 by which WINDOW
635 can be shrunk.
637 Optional argument IGNORE non-nil means ignore any restrictions
638 imposed by fixed size windows, `window-min-height' or
639 `window-min-width' settings. IGNORE equal `safe' means live
640 windows may get as small as `window-safe-min-height' lines and
641 `window-safe-min-width' columns. IGNORE any window means ignore
642 restrictions for that window only."
648 delta))
650 delta)
653 0
654 delta))
658 "Return t if WINDOW can be resized by DELTA lines.
659 For the meaning of the arguments of this function see the
660 doc-string of `window-sizable'."
667 "Internal function for `window-size-fixed-p'."
671 ;; WINDOW is an internal window.
673 ;; An iso-combination is fixed size if all its subwindows
674 ;; are fixed-size.
678 ;; We found a non-fixed-size subwindow, so WINDOW's
679 ;; size is not fixed.
682 ;; All subwindows are fixed-size, so WINDOW's size is
683 ;; fixed.
685 ;; An ortho-combination is fixed-size if at least one of its
686 ;; subwindows is fixed-size.
689 ;; We found a fixed-size subwindow, so WINDOW's size is
690 ;; fixed.
693 ;; WINDOW is a live window.
700 "Return non-nil if WINDOW's height is fixed.
701 WINDOW can be an arbitrary window and defaults to the selected
702 window. Optional argument HORIZONTAL non-nil means return
703 non-nil if WINDOW's width is fixed.
705 If this function returns nil, this does not necessarily mean that
706 WINDOW can be resized in the desired direction. The functions
707 `window-resizable' and `window-resizable-p' will tell that."
712 "Internal function for `window-min-delta'."
714 ;; If we can't go up, return zero.
715 0
716 ;; Else try to find a non-fixed-size sibling of WINDOW.
721 ;; In an iso-combination throw DELTA if we find at least one
722 ;; subwindow and that subwindow is either not of fixed-size
723 ;; or we can ignore fixed-sizeness.
733 ;; We found a non-fixed-size subwindow.
736 ;; In an ortho-combination set DELTA to the minimum value by
737 ;; which other subwindows can shrink.
746 delta
750 "Return number of lines by which WINDOW can be shrunk.
751 WINDOW can be an arbitrary window and defaults to the selected
752 window. Return zero if WINDOW cannot be shrunk.
754 Optional argument HORIZONTAL non-nil means return number of
755 columns by which WINDOW can be shrunk.
757 Optional argument IGNORE non-nil means ignore any restrictions
758 imposed by fixed size windows, `window-min-height' or
759 `window-min-width' settings. IGNORE a window means ignore
760 restrictions for that window only. IGNORE equal `safe' means
761 live windows may get as small as `window-safe-min-height' lines
762 and `window-safe-min-width' columns.
764 Optional argument TRAIL `before' means only windows to the left
765 of or above WINDOW can be enlarged. Optional argument TRAIL
766 `after' means only windows to the right of or below WINDOW can be
767 enlarged.
769 Optional argument NOUP non-nil means don't go up in the window
770 tree but try to enlarge windows within WINDOW's combination only.
772 Optional argument NODOWN non-nil means don't check whether WINDOW
773 itself \(and its subwindows) can be shrunk; check only whether at
774 least one other windows can be enlarged appropriately."
780 ;; If NODOWN is t, try to recover the entire size of WINDOW.
783 ;; If NODOWN is nil and WINDOW's size is already at its minimum,
784 ;; there's nothing to recover.
787 ;; Otherwise, try to recover whatever WINDOW is larger than its
788 ;; minimum size.
793 "Internal function of `window-max-delta'."
795 ;; Can't go up. Return DELTA.
796 delta
801 ;; For an iso-combination calculate how much we can get from
802 ;; other subwindows.
811 (+ delta
815 ;; For an ortho-combination throw DELTA when at least one
816 ;; subwindow is fixed-size.
824 ;; When NOUP is nil, DELTA is all we can get.
825 delta
826 ;; Else try with parent of WINDOW, passing the DELTA we
827 ;; recovered so far.
831 "Return maximum number of lines WINDOW by which WINDOW can be enlarged.
832 WINDOW can be an arbitrary window and defaults to the selected
833 window. The return value is zero if WINDOW cannot be enlarged.
835 Optional argument HORIZONTAL non-nil means return maximum number
836 of columns by which WINDOW can be enlarged.
838 Optional argument IGNORE non-nil means ignore any restrictions
839 imposed by fixed size windows, `window-min-height' or
840 `window-min-width' settings. IGNORE a window means ignore
841 restrictions for that window only. IGNORE equal `safe' means
842 live windows may get as small as `window-safe-min-height' lines
843 and `window-safe-min-width' columns.
845 Optional argument TRAIL `before' means only windows to the left
846 of or below WINDOW can be shrunk. Optional argument TRAIL
847 `after' means only windows to the right of or above WINDOW can be
848 shrunk.
850 Optional argument NOUP non-nil means don't go up in the window
851 tree but try to obtain the entire space from windows within
852 WINDOW's combination.
854 Optional argument NODOWN non-nil means do not check whether
855 WINDOW itself \(and its subwindows) can be enlarged; check only
856 whether other windows can be shrunk appropriately."
860 ;; With IGNORE and NOWDON nil return zero if WINDOW has fixed
861 ;; size.
862 0
863 ;; WINDOW has no fixed size.
866 ;; Make NOUP also inhibit the min-size check.
868 "Return DELTA if WINDOW can be resized vertically by DELTA lines.
869 Optional argument HORIZONTAL non-nil means return DELTA if WINDOW
870 can be resized horizontally by DELTA columns. A return value of
871 zero means that WINDOW is not resizable.
873 DELTA positive means WINDOW shall be enlarged by DELTA lines or
874 columns. If WINDOW cannot be enlarged by DELTA lines or columns
875 return the maximum value in the range 0..DELTA by which WINDOW
876 can be enlarged.
878 DELTA negative means WINDOW shall be shrunk by -DELTA lines or
879 columns. If WINDOW cannot be shrunk by -DELTA lines or columns,
880 return the minimum value in the range DELTA..0 that can be used
881 for shrinking WINDOW.
883 Optional argument IGNORE non-nil means ignore any restrictions
884 imposed by fixed size windows, `window-min-height' or
885 `window-min-width' settings. IGNORE a window means ignore
886 restrictions for that window only. IGNORE equal `safe' means
887 live windows may get as small as `window-safe-min-height' lines
888 and `window-safe-min-width' columns.
890 Optional argument TRAIL `before' means only windows to the left
891 of or below WINDOW can be shrunk. Optional argument TRAIL
892 `after' means only windows to the right of or above WINDOW can be
893 shrunk.
895 Optional argument NOUP non-nil means don't go up in the window
896 tree but try to distribute the space among the other windows
897 within WINDOW's combination.
899 Optional argument NODOWN non-nil means don't check whether WINDOW
900 and its subwindows can be resized."
905 delta))
908 delta))
912 "Return t if WINDOW can be resized vertically by DELTA lines.
913 For the meaning of the arguments of this function see the
914 doc-string of `window-resizable'."
918 delta)
920 delta)))
923 "Return the total number of lines of WINDOW.
924 WINDOW can be any window and defaults to the selected one. The
925 return value includes WINDOW's mode line and header line, if any.
926 If WINDOW is internal the return value is the sum of the total
927 number of lines of WINDOW's child windows if these are vertically
928 combined and the height of WINDOW's first child otherwise.
930 Note: This function does not take into account the value of
931 `line-spacing' when calculating the number of lines in WINDOW."
934 ;; Eventually we should make `window-height' obsolete.
937 ;; See discussion in bug#4543.
939 "Return t if WINDOW is as high as the containing frame.
940 More precisely, return t if and only if the total height of
941 WINDOW equals the total height of the root window of WINDOW's
942 frame. WINDOW can be any window and defaults to the selected
943 one."
949 "Return the total number of columns of WINDOW.
950 WINDOW can be any window and defaults to the selected one. The
951 return value includes any vertical dividers or scrollbars of
952 WINDOW. If WINDOW is internal, the return value is the sum of
953 the total number of columns of WINDOW's child windows if these
954 are horizontally combined and the width of WINDOW's first child
955 otherwise."
959 "Return t if WINDOW is as wide as the containing frame.
960 More precisely, return t if and only if the total width of WINDOW
961 equals the total width of the root window of WINDOW's frame.
962 WINDOW can be any window and defaults to the selected one."
968 "Return the number of lines of WINDOW's body.
969 WINDOW must be a live window and defaults to the selected one.
971 The return value does not include WINDOW's mode line and header
972 line, if any. If a line at the bottom of the window is only
973 partially visible, that line is included in the return value. If
974 you do not want to include a partially visible bottom line in the
975 return value, use `window-text-height' instead."
979 "Return the number of columns of WINDOW's body.
980 WINDOW must be a live window and defaults to the selected one.
982 The return value does not include any vertical dividers or scroll
983 bars owned by WINDOW. On a window-system the return value does
984 not include the number of columns used for WINDOW's fringes or
985 display margins either."
988 ;; Eventually we should make `window-height' obsolete.
992 "Return the current scroll bar settings for WINDOW.
993 WINDOW must be a live window and defaults to the selected one.
995 The return value is a cons cell (VERTICAL . HORIZONTAL) where
996 VERTICAL specifies the current location of the vertical scroll
997 bars (`left', `right', or nil), and HORIZONTAL specifies the
998 current location of the horizontal scroll bars (`top', `bottom',
999 or nil).
1001 Unlike `window-scroll-bars', this function reports the scroll bar
1002 type actually used, once frame defaults and `scroll-bar-mode' are
1003 taken into account."
1016 "Cycle through all live windows, calling PROC for each one.
1017 PROC must specify a function with a window as its sole argument.
1018 The optional arguments MINIBUF and ALL-FRAMES specify the set of
1019 windows to include in the walk.
1021 MINIBUF t means include the minibuffer window even if the
1022 minibuffer is not active. MINIBUF nil or omitted means include
1023 the minibuffer window only if the minibuffer is active. Any
1024 other value means do not include the minibuffer window even if
1025 the minibuffer is active.
1027 ALL-FRAMES nil or omitted means consider all windows on the
1028 selected frame, plus the minibuffer window if specified by the
1029 MINIBUF argument. If the minibuffer counts, consider all windows
1030 on all frames that share that minibuffer too. The following
1031 non-nil values of ALL-FRAMES have special meanings:
1033 - t means consider all windows on all existing frames.
1035 - `visible' means consider all windows on all visible frames on
1036 the current terminal.
1038 - 0 (the number zero) means consider all windows on all visible
1039 and iconified frames on the current terminal.
1041 - A frame means consider all windows on that frame only.
1043 Anything else means consider all windows on the selected frame
1044 and no others.
1046 This function changes neither the order of recently selected
1047 windows nor the buffer list."
1048 ;; If we start from the minibuffer window, don't fail to come
1049 ;; back to it.
1052 ;; Make sure to not mess up the order of recently selected
1053 ;; windows. Use `save-selected-window' and `select-window'
1054 ;; with second argument non-nil for this purpose.
1062 "Support function for `window-in-direction'."
1074 "Return window in DIRECTION as seen from WINDOW.
1075 DIRECTION must be one of `above', `below', `left' or `right'.
1076 WINDOW must be a live window and defaults to the selected one.
1077 IGNORE, when non-nil means a window can be returned even if its
1078 `no-other-window' parameter is non-nil."
1091 ;; The column / row value of `posn-at-point' can be nil for the
1092 ;; mini-window, guard against that.
1103 best best-2 best-diff-2-new)
1110 ;; Ignore ourselves.
1112 ;; Ignore W unless IGNORE is non-nil.
1118 ;; W is to the left or right of WINDOW and covers POSN.
1128 ;; W is to the left or right of WINDOW but does not
1129 ;; cover POSN.
1144 ;; W is above or below WINDOW and covers POSN.
1154 ;; W is above or below WINDOW but does not cover POSN.
1169 "Return a live window satisfying PREDICATE.
1170 More precisely, cycle through all windows calling the function
1171 PREDICATE on each one of them with the window as its sole
1172 argument. Return the first window for which PREDICATE returns
1173 non-nil. Windows are scanned starting with the window following
1174 the selcted window. If no window satisfies PREDICATE, return
1175 DEFAULT.
1177 MINIBUF t means include the minibuffer window even if the
1178 minibuffer is not active. MINIBUF nil or omitted means include
1179 the minibuffer window only if the minibuffer is active. Any
1180 other value means do not include the minibuffer window even if
1181 the minibuffer is active.
1183 ALL-FRAMES nil or omitted means consider all windows on the selected
1184 frame, plus the minibuffer window if specified by the MINIBUF
1185 argument. If the minibuffer counts, consider all windows on all
1186 frames that share that minibuffer too. The following non-nil
1187 values of ALL-FRAMES have special meanings:
1189 - t means consider all windows on all existing frames.
1191 - `visible' means consider all windows on all visible frames on
1192 the current terminal.
1194 - 0 (the number zero) means consider all windows on all visible
1195 and iconified frames on the current terminal.
1197 - A frame means consider all windows on that frame only.
1199 Anything else means consider all windows on the selected frame
1200 and no others."
1204 minibuf all-frames))
1207 default))
1212 "Return the least recently used window on frames specified by ALL-FRAMES.
1213 Return a full-width window if possible. A minibuffer window is
1214 never a candidate. A dedicated window is never a candidate
1215 unless DEDICATED is non-nil, so if all windows are dedicated, the
1216 value is nil. Avoid returning the selected window if possible.
1218 The following non-nil values of the optional argument ALL-FRAMES
1219 have special meanings:
1221 - t means consider all windows on all existing frames.
1223 - `visible' means consider all windows on all visible frames on
1224 the current terminal.
1226 - 0 (the number zero) means consider all windows on all visible
1227 and iconified frames on the current terminal.
1229 - A frame means consider all windows on that frame only.
1231 Any other value of ALL-FRAMES means consider all windows on the
1232 selected frame and no others."
1248 "Return the most recently used window on frames specified by ALL-FRAMES.
1249 Do not return a minibuffer window.
1251 The following non-nil values of the optional argument ALL-FRAMES
1252 have special meanings:
1254 - t means consider all windows on all existing frames.
1256 - `visible' means consider all windows on all visible frames on
1257 the current terminal.
1259 - 0 (the number zero) means consider all windows on all visible
1260 and iconified frames on the current terminal.
1262 - A frame means consider all windows on that frame only.
1264 Any other value of ALL-FRAMES means consider all windows on the
1265 selected frame and no others."
1272 best-window))
1275 "Return the largest window on frames specified by ALL-FRAMES.
1276 A minibuffer window is never a candidate. A dedicated window is
1277 never a candidate unless DEDICATED is non-nil, so if all windows
1278 are dedicated, the value is nil.
1280 The following non-nil values of the optional argument ALL-FRAMES
1281 have special meanings:
1283 - t means consider all windows on all existing frames.
1285 - `visible' means consider all windows on all visible frames on
1286 the current terminal.
1288 - 0 (the number zero) means consider all windows on all visible
1289 and iconified frames on the current terminal.
1291 - A frame means consider all windows on that frame only.
1293 Any other value of ALL-FRAMES means consider all windows on the
1294 selected frame and no others."
1296 best-window size)
1304 best-window))
1307 "Return list of all windows displaying BUFFER-OR-NAME, or nil if none.
1308 BUFFER-OR-NAME may be a buffer or the name of an existing buffer
1309 and defaults to the current buffer. Windows are scanned starting
1310 with the selected window.
1312 MINIBUF t means include the minibuffer window even if the
1313 minibuffer is not active. MINIBUF nil or omitted means include
1314 the minibuffer window only if the minibuffer is active. Any
1315 other value means do not include the minibuffer window even if
1316 the minibuffer is active.
1318 ALL-FRAMES nil or omitted means consider all windows on the
1319 selected frame, plus the minibuffer window if specified by the
1320 MINIBUF argument. If the minibuffer counts, consider all windows
1321 on all frames that share that minibuffer too. The following
1322 non-nil values of ALL-FRAMES have special meanings:
1324 - t means consider all windows on all existing frames.
1326 - `visible' means consider all windows on all visible frames on
1327 the current terminal.
1329 - 0 (the number zero) means consider all windows on all visible
1330 and iconified frames on the current terminal.
1332 - A frame means consider all windows on that frame only.
1334 Anything else means consider all windows on the selected frame
1335 and no others."
1337 windows)
1344 "Return t if WINDOW is the currently active minibuffer window."
1348 "Return the number of live windows on the selected frame.
1349 The optional argument MINIBUF specifies whether the minibuffer
1350 window shall be counted. See `walk-windows' for the precise
1351 meaning of this argument."
1353 \f
1354 ;;; Resizing windows.
1356 "Reset resize values for all windows on FRAME.
1357 FRAME defaults to the selected frame.
1359 This function stores the current value of `window-total-size' applied
1360 with argument HORIZONTAL in the new total size of all windows on
1361 FRAME. It also resets the new normal size of each of these
1362 windows."
1367 "Internal function of `window--resize-reset'."
1368 ;; Register old size in the new total size.
1370 ;; Reset new normal size.
1377 ;; The following routine is used to manually resize the minibuffer
1378 ;; window and is currently used, for example, by ispell.el.
1380 "Resize minibuffer window WINDOW by DELTA lines.
1381 If WINDOW cannot be resized by DELTA lines make it as large \(or
1382 as small) as possible but don't signal an error."
1390 ;; Sanitize DELTA.
1397 ;; Resize now.
1399 ;; Ideally we should be able to resize just the last subwindow of
1400 ;; root here. See the comment in `resize-root-window-vertically'
1401 ;; for why we do not do that.
1404 ;; The following routine catches the case where we want to resize
1405 ;; a minibuffer-only frame.
1409 "Resize WINDOW vertically by DELTA lines.
1410 WINDOW can be an arbitrary window and defaults to the selected
1411 one. An attempt to resize the root window of a frame will raise
1412 an error though.
1414 DELTA a positive number means WINDOW shall be enlarged by DELTA
1415 lines. DELTA negative means WINDOW shall be shrunk by -DELTA
1416 lines.
1418 Optional argument HORIZONTAL non-nil means resize WINDOW
1419 horizontally by DELTA columns. In this case a positive DELTA
1420 means enlarge WINDOW by DELTA columns. DELTA negative means
1421 WINDOW shall be shrunk by -DELTA columns.
1423 Optional argument IGNORE non-nil means ignore any restrictions
1424 imposed by fixed size windows, `window-min-height' or
1425 `window-min-width' settings. IGNORE any window means ignore
1426 restrictions for that window only. IGNORE equal `safe' means
1427 live windows may get as small as `window-safe-min-height' lines
1428 and `window-safe-min-width' columns.
1430 This function resizes other windows proportionally and never
1431 deletes any windows. If you want to move only the low (right)
1432 edge of WINDOW consider using `adjust-window-trailing-edge'
1433 instead."
1436 sibling)
1449 ;; If window-splits returns nil for WINDOW, WINDOW is part of
1450 ;; an iso-combination, and WINDOW's neighboring right or left
1451 ;; sibling can be resized as requested, resize that sibling.
1458 normal-delta))
1461 normal-delta)))
1462 ;; Otherwise, resize all other windows in the same combination.
1469 "Return non-nil if WINDOW shall be skipped by resizing routines."
1472 (defun window--resize-subwindows-normal (parent horizontal window this-delta &optional trail other-delta)
1473 "Set the new normal height of subwindows of window PARENT.
1474 HORIZONTAL non-nil means set the new normal width of these
1475 windows. WINDOW specifies a subwindow of PARENT that has been
1476 resized by THIS-DELTA lines \(columns).
1478 Optional argument TRAIL either 'before or 'after means set values
1479 for windows before or after WINDOW only. Optional argument
1480 OTHER-DELTA a number specifies that this many lines \(columns)
1481 have been obtained from \(or returned to) an ancestor window of
1482 PARENT in order to resize WINDOW."
1486 ;; When WINDOW gets deleted and we can return its entire
1487 ;; space to its siblings, use WINDOW's normal size as the
1488 ;; normal delta.
1490 ;; In any other case calculate the normal delta from the
1491 ;; relation of THIS-DELTA to the total size of PARENT.
1497 ;; Set parent-normal to the sum of the normal sizes of all
1498 ;; subwindows of PARENT that shall be resized, excluding only WINDOW
1499 ;; and any windows specified by the optional TRAIL argument.
1510 ;; Set the new normal size of all subwindows of PARENT from what
1511 ;; they should have contributed for recovering THIS-DELTA lines
1512 ;; (columns).
1526 delta-normal))
1527 ;; Don't drop below 0.
1532 ;; Set the new normal size of windows from what they should have
1533 ;; contributed for recovering OTHER-DELTA lines (columns).
1536 other-delta)))
1548 ;; Don't drop below 0.
1552 ;; Set the new normal size of WINDOW to what is left by the sum of
1553 ;; the normal sizes of its siblings.
1555 window
1566 ;; Don't get larger than 1 or smaller than 0.
1570 "Resize subwindows of window PARENT vertically by DELTA lines.
1571 PARENT must be a vertically combined internal window.
1573 Optional argument HORIZONTAL non-nil means resize subwindows of
1574 PARENT horizontally by DELTA columns. In this case PARENT must
1575 be a horizontally combined internal window.
1577 WINDOW, if specified, must denote a child window of PARENT that
1578 is resized by DELTA lines.
1580 Optional argument IGNORE non-nil means ignore any restrictions
1581 imposed by fixed size windows, `window-min-height' or
1582 `window-min-width' settings. IGNORE equal `safe' means live
1583 windows may get as small as `window-safe-min-height' lines and
1584 `window-safe-min-width' columns. IGNORE any window means ignore
1585 restrictions for that window only.
1587 Optional arguments TRAIL and EDGE, when non-nil, restrict the set
1588 of windows that shall be resized. If TRAIL equals `before',
1589 resize only windows on the left or above EDGE. If TRAIL equals
1590 `after', resize only windows on the right or below EDGE. Also,
1591 preferably only resize windows adjacent to EDGE.
1593 Return the symbol `normalized' if new normal sizes have been
1594 already set by this routine."
1598 best-window best-value)
1610 sub)
1615 edge)
1620 edge)
1623 ;; Resize only windows adjacent to EDGE.
1626 sub delta horizontal ignore t trail edge)
1629 ;; Assign new normal sizes.
1638 ;; Return 'normalized to notify `window--resize-siblings' that
1639 ;; normal sizes have been already set.
1641 ;; Resize all windows proportionally.
1646 ;; Ignore windows to skip and fixed-size subwindows - in
1647 ;; the latter case make it a window to skip.
1652 ;; When shrinking store the number of lines/cols we can get
1653 ;; from this window here together with the total/normal size
1654 ;; factor.
1656 sub
1658 ;; We used to call this with NODOWN t, "fixed" 2011-05-11.
1661 parent-total)
1664 ;; When enlarging store the total/normal size factor only
1666 sub
1668 parent-total)
1675 ;; Shrink windows by delta.
1694 best-window
1699 parent-total)
1702 ;; Enlarge windows by delta.
1720 best-window
1722 parent-total)
1730 ;; Reset new normal size fields so `window-resize-apply'
1731 ;; won't use them to apply new sizes.
1735 ;; Resize this subwindow's subwindows (back-engineering
1736 ;; delta from sub's old and new total sizes).
1740 ;; For the TRAIL non-nil case we have to resize SUB
1741 ;; recursively even if it's size does not change.
1743 sub delta horizontal ignore nil trail edge))))
1747 "Resize other windows when WINDOW is resized vertically by DELTA lines.
1748 Optional argument HORIZONTAL non-nil means resize other windows
1749 when WINDOW is resized horizontally by DELTA columns. WINDOW
1750 itself is not resized by this function.
1752 Optional argument IGNORE non-nil means ignore any restrictions
1753 imposed by fixed size windows, `window-min-height' or
1754 `window-min-width' settings. IGNORE equal `safe' means live
1755 windows may get as small as `window-safe-min-height' lines and
1756 `window-safe-min-width' columns. IGNORE any window means ignore
1757 restrictions for that window only.
1759 Optional arguments TRAIL and EDGE, when non-nil, refine the set
1760 of windows that shall be resized. If TRAIL equals `before',
1761 resize only windows on the left or above EDGE. If TRAIL equals
1762 `after', resize only windows on the right or below EDGE. Also,
1763 preferably only resize windows adjacent to EDGE."
1768 ;; In an iso-combination try to extract DELTA from WINDOW's
1769 ;; siblings.
1772 this-delta other-delta)
1773 ;; Decide which windows shall be left alone.
1777 ;; Make sure WINDOW is left alone when
1778 ;; resizing its siblings.
1782 ;; Make sure this sibling is left alone when
1783 ;; resizing its siblings.
1787 ;; Set this-delta to t to signal that we found a sibling
1788 ;; of WINDOW whose size is not fixed.
1793 ;; Set this-delta to what we can get from WINDOW's siblings.
1795 ;; A deletion, presumably. We must handle this case
1796 ;; specially since `window-resizable' can't be used.
1798 ;; There's at least one resizable sibling we can
1799 ;; give WINDOW's size to.
1801 ;; No resizable sibling exists.
1803 ;; Any other form of resizing.
1807 ;; Set other-delta to what we still have to get from
1808 ;; ancestor windows of parent.
1811 ;; Unless we got everything from WINDOW's siblings, PARENT
1812 ;; must be resized by other-delta lines or columns.
1816 ;; We haven't got anything from WINDOW's siblings but we
1817 ;; must update the normal sizes to respect other-delta.
1819 parent horizontal window this-delta trail other-delta)
1820 ;; We did get something from WINDOW's siblings which means
1821 ;; we have to resize their subwindows.
1824 window ignore trail edge)
1825 ;; If `window--resize-subwindows' returns
1826 ;; 'normalized, this means it has set the
1827 ;; normal sizes already.
1829 ;; Set the normal sizes.
1831 parent horizontal window this-delta trail other-delta))
1832 ;; Set DELTA to what we still have to get from ancestor
1833 ;; windows.
1836 ;; In an ortho-combination all siblings of WINDOW must be
1837 ;; resized by DELTA.
1845 ;; "Go up."
1847 parent delta horizontal ignore trail edge)))))
1850 "Resize WINDOW vertically by DELTA lines.
1851 Optional argument HORIZONTAL non-nil means resize WINDOW
1852 horizontally by DELTA columns.
1854 Optional argument IGNORE non-nil means ignore any restrictions
1855 imposed by fixed size windows, `window-min-height' or
1856 `window-min-width' settings. IGNORE equal `safe' means live
1857 windows may get as small as `window-safe-min-height' lines and
1858 `window-safe-min-width' columns. IGNORE any window means ignore
1859 restrictions for that window only.
1861 Optional argument ADD non-nil means add DELTA to the new total
1862 size of WINDOW.
1864 Optional arguments TRAIL and EDGE, when non-nil, refine the set
1865 of windows that shall be resized. If TRAIL equals `before',
1866 resize only windows on the left or above EDGE. If TRAIL equals
1867 `after', resize only windows on the right or below EDGE. Also,
1868 preferably only resize windows adjacent to EDGE.
1870 This function recursively resizes WINDOW's subwindows to fit the
1871 new size. Make sure that WINDOW is `window-resizable' before
1872 calling this function. Note that this function does not resize
1873 siblings of WINDOW or WINDOW's parent window. You have to
1874 eventually call `window-resize-apply' in order to make resizing
1875 actually take effect."
1877 ;; Add DELTA to the new total size of WINDOW.
1884 ;; In an iso-combination resize subwindows according to their
1885 ;; normal sizes.
1887 window delta horizontal nil ignore trail edge))
1888 ;; In an ortho-combination resize each subwindow by DELTA.
1892 sub delta horizontal ignore t trail edge)
1896 "Resize root window WINDOW vertically by DELTA lines.
1897 HORIZONTAL non-nil means resize root window WINDOW horizontally
1898 by DELTA columns.
1900 IGNORE non-nil means ignore any restrictions imposed by fixed
1901 size windows, `window-min-height' or `window-min-width' settings.
1903 This function is only called by the frame resizing routines. It
1904 resizes windows proportionally and never deletes any windows."
1911 "Resize root window WINDOW vertically by DELTA lines.
1912 If DELTA is less than zero and we can't shrink WINDOW by DELTA
1913 lines, shrink it as much as possible. If DELTA is greater than
1914 zero, this function can resize fixed-size subwindows in order to
1915 recover the necessary lines.
1917 Return the number of lines that were recovered.
1919 This function is only called by the minibuffer window resizing
1920 routines. It resizes windows proportionally and never deletes
1921 any windows."
1932 ;; Ideally, we would resize just the last window in a combination
1933 ;; but that's not feasible for the following reason: If we grow
1934 ;; the minibuffer window and the last window cannot be shrunk any
1935 ;; more, we shrink another window instead. But if we then shrink
1936 ;; the minibuffer window again, the last window might get enlarged
1937 ;; and the state after shrinking is not the state before growing.
1938 ;; So, in practice, we'd need a history variable to record how to
1939 ;; proceed. But I'm not sure how such a variable could work with
1940 ;; repeated minibuffer window growing steps.
1942 delta)))
1945 "Move WINDOW's bottom edge by DELTA lines.
1946 Optional argument HORIZONTAL non-nil means move WINDOW's right
1947 edge by DELTA columns. WINDOW defaults to the selected window.
1949 If DELTA is greater zero, then move the edge downwards or to the
1950 right. If DELTA is less than zero, move the edge upwards or to
1951 the left. If the edge can't be moved by DELTA lines or columns,
1952 move it as far as possible in the desired direction."
1956 left this-delta min-delta max-delta failed)
1957 ;; Find the edge we want to move.
1970 ;; Set LEFT to the first resizable window on the left. This step is
1971 ;; needed to handle fixed-size windows.
1984 ;; Set RIGHT to the first resizable window on the right. This step
1985 ;; is needed to handle fixed-size windows.
1998 ;; LEFT and RIGHT (which might be both internal windows) are now the
1999 ;; two windows we want to resize.
2005 ;; We can't get the whole DELTA - move as far as possible.
2008 ;; Start resizing.
2010 ;; Try to enlarge LEFT first.
2014 left this-delta horizontal nil t 'before
2018 ;; Shrink windows on right of LEFT.
2020 left delta horizontal nil 'after
2028 ;; We can't get the whole DELTA - move as far as possible.
2031 ;; Start resizing.
2033 ;; Try to enlarge RIGHT.
2037 right this-delta horizontal nil t 'after
2041 ;; Shrink windows on left of RIGHT.
2048 ;; Don't report an error in the standard case.
2050 ;; But do report an error if applying the changes fails.
2054 "Make selected window DELTA lines taller.
2055 Interactively, if no argument is given, make the selected window
2056 one line taller. If optional argument HORIZONTAL is non-nil,
2057 make selected window wider by DELTA columns. If DELTA is
2058 negative, shrink selected window by -DELTA lines or columns.
2059 Return nil."
2072 horizontal))))
2075 "Make selected window DELTA lines smaller.
2076 Interactively, if no argument is given, make the selected window
2077 one line smaller. If optional argument HORIZONTAL is non-nil,
2078 make selected window narrower by DELTA columns. If DELTA is
2079 negative, enlarge selected window by -DELTA lines or columns.
2080 Return nil."
2093 horizontal))))
2096 "Maximize WINDOW.
2097 Make WINDOW as large as possible without deleting any windows.
2098 WINDOW can be any window and defaults to the selected window."
2105 "Minimize WINDOW.
2106 Make WINDOW as small as possible without deleting any windows.
2107 WINDOW can be any window and defaults to the selected window."
2112 \f
2114 "Return non-nil if WINDOW is the root window of its frame."
2118 "Return window tree rooted at WINDOW.
2119 Optional argument NEXT non-nil means include windows right
2120 siblings in the return value.
2122 See the documentation of `window-tree' for a description of the
2123 return value."
2136 list))
2141 "Return the window tree of frame FRAME.
2142 FRAME must be a live frame and defaults to the selected frame.
2143 The return value is a list of the form (ROOT MINI), where ROOT
2144 represents the window tree of the frame's root window, and MINI
2145 is the frame's minibuffer window.
2147 If the root window is not split, ROOT is the root window itself.
2148 Otherwise, ROOT is a list (DIR EDGES W1 W2 ...) where DIR is nil
2149 for a horizontal split, and t for a vertical split. EDGES gives
2150 the combined size and position of the subwindows in the split,
2151 and the rest of the elements are the subwindows in the split.
2152 Each of the subwindows may again be a window or a list
2153 representing a window split, and so on. EDGES is a list \(LEFT
2154 TOP RIGHT BOTTOM) as returned by `window-edges'."
2157 \f
2159 "Select another window in cyclic ordering of windows.
2160 COUNT specifies the number of windows to skip, starting with the
2161 selected window, before making the selection. If COUNT is
2162 positive, skip COUNT windows forwards. If COUNT is negative,
2163 skip -COUNT windows backwards. COUNT zero means do not skip any
2164 window, so select the selected window. In an interactive call,
2165 COUNT is the numeric prefix argument. Return nil.
2167 If the `other-window' parameter of WINDOW is a function and
2168 `ignore-window-parameters' is nil, call that function with the
2169 arguments COUNT and ALL-FRAMES.
2171 This function does not select a window whose `no-other-window'
2172 window parameter is non-nil.
2174 This function uses `next-window' for finding the window to
2175 select. The argument ALL-FRAMES has the same meaning as in
2176 `next-window', but the MINIBUF argument of `next-window' is
2177 always effectively nil."
2182 old-window old-count)
2185 ;; `next-window' and `previous-window' may return a window we are
2186 ;; not allowed to select. Hence we need an exit strategy in case
2187 ;; all windows are non-selectable.
2194 ;; Keep out of infinite loops. When COUNT has not changed
2195 ;; since we last looked at `window' we're probably in one.
2199 ;; The first non-selectable window `next-window' got us:
2200 ;; Remember it and the current value of COUNT.
2210 ;; Keep out of infinite loops. When COUNT has not changed
2211 ;; since we last looked at `window' we're probably in one.
2215 ;; The first non-selectable window `previous-window' got
2216 ;; us: Remember it and the current value of COUNT.
2223 ;; Always return nil.
2224 nil))))
2226 ;; This should probably return non-nil when the selected window is part
2227 ;; of an atomic window whose root is the frame's root window.
2229 "Return non-nil if the selected window is the only window.
2230 Optional arg NOMINI non-nil means don't count the minibuffer
2231 even if it is active. Otherwise, the minibuffer is counted
2232 when it is active.
2234 Optional argument ALL-FRAMES specifies the set of frames to
2235 consider, see also `next-window'. ALL-FRAMES nil or omitted
2236 means consider windows on the selected frame only, plus the
2237 minibuffer window if specified by the NOMINI argument. If the
2238 minibuffer counts, consider all windows on all frames that share
2239 that minibuffer too. The remaining non-nil values of ALL-FRAMES
2240 with a special meaning are:
2242 - t means consider all windows on all existing frames.
2244 - `visible' means consider all windows on all visible frames on
2245 the current terminal.
2247 - 0 (the number zero) means consider all windows on all visible
2248 and iconified frames on the current terminal.
2250 - A frame means consider all windows on that frame only.
2252 Anything else means consider all windows on the selected frame
2253 and no others."
2259 \f
2260 ;;; Deleting windows.
2262 "Return t if WINDOW can be safely deleted from its frame.
2263 Return `frame' if deleting WINDOW should also delete its
2264 frame."
2268 ;; Handle atomicity.
2277 ;; WINDOW's frame can be deleted only if there are other visible
2278 ;; frames on the same terminal.
2289 ;; WINDOW can be deleted unless it is the main window of its
2290 ;; frame.
2291 t))))
2294 "Return t if SUBWINDOW is either WINDOW or a subwindow of WINDOW."
2304 "Delete WINDOW.
2305 WINDOW can be an arbitrary window and defaults to the selected
2306 one. Return nil.
2308 If the variable `ignore-window-parameters' is non-nil or the
2309 `delete-window' parameter of WINDOW equals t, do not process any
2310 parameters of WINDOW. Otherwise, if the `delete-window'
2311 parameter of WINDOW specifies a function, call that function with
2312 WINDOW as its sole argument and return the value returned by that
2313 function.
2315 Otherwise, if WINDOW is part of an atomic window, call
2316 `delete-window' with the root of the atomic window as its
2317 argument. If WINDOW is the only window on its frame or the last
2318 non-side window, signal an error."
2324 atom-root)
2327 ;; Handle window parameters.
2329 ;; Ignore window parameters if `ignore-window-parameters' tells
2330 ;; us so or `delete-window' equals t.
2333 ;; The `delete-window' parameter specifies the function to call.
2334 ;; If that function is `ignore' nothing is done. It's up to the
2335 ;; function called here to avoid infinite recursion.
2352 ;; Emacs 23 preferably gives WINDOW's space to its left
2353 ;; sibling.
2359 ;; Resize WINDOW's sibling.
2365 ;; Can do without resizing fixed-size windows.
2368 ;; Can't do without resizing fixed-size windows.
2370 ;; Actually delete WINDOW.
2375 ;; `delete-window-internal' has selected a window that should
2376 ;; not be selected, fix this here.
2380 ;; Always return nil.
2381 nil))))
2384 "Make WINDOW fill its frame.
2385 WINDOW may be any window and defaults to the selected one.
2386 Return nil.
2388 If the variable `ignore-window-parameters' is non-nil or the
2389 `delete-other-windows' parameter of WINDOW equals t, do not
2390 process any parameters of WINDOW. Otherwise, if the
2391 `delete-other-windows' parameter of WINDOW specifies a function,
2392 call that function with WINDOW as its sole argument and return
2393 the value returned by that function.
2395 Otherwise, if WINDOW is part of an atomic window, call this
2396 function with the root of the atomic window as its argument. If
2397 WINDOW is a non-side window, make WINDOW the only non-side window
2398 on the frame. Side windows are not deleted. If WINDOW is a side
2399 window signal an error."
2405 atom-root side-main)
2409 ;; Ignore window parameters if `ignore-window-parameters' is t or
2410 ;; `delete-other-windows' is t.
2413 ;; The `delete-other-windows' parameter specifies the function
2414 ;; to call. If the function is `ignore' no windows are deleted.
2415 ;; It's up to the function called to avoid infinite recursion.
2422 ;; Set side-main to the major non-side window.
2426 ;; If WINDOW is the main non-side window, do nothing.
2431 ;; Always return nil.
2432 nil)))
2435 "Delete the windows in the same column with WINDOW, but not WINDOW itself.
2437 if you often split windows horizontally."
2449 ;;; Windows and buffers.
2451 ;; `prev-buffers' and `next-buffers' are two reserved window slots used
2452 ;; for (1) determining which buffer to show in the window when its
2453 ;; buffer shall be buried or killed and (2) which buffer to show for
2454 ;; `switch-to-prev-buffer' and `switch-to-next-buffer'.
2456 ;; `prev-buffers' consists of <buffer, window-start, window-point>
2457 ;; triples. The entries on this list are ordered by the time their
2458 ;; buffer has been removed from the window, the most recently removed
2459 ;; buffer's entry being first. The window-start and window-point
2460 ;; components are `window-start' and `window-point' at the time the
2461 ;; buffer was removed from the window which implies that the entry must
2462 ;; be added when `set-window-buffer' removes the buffer from the window.
2464 ;; `next-buffers' is the list of buffers that have been replaced
2465 ;; recently by `switch-to-prev-buffer'. These buffers are the least
2466 ;; preferred candidates of `switch-to-prev-buffer' and the preferred
2467 ;; candidates of `switch-to-next-buffer' to switch to. This list is
2468 ;; reset to nil by any action changing the window's buffer with the
2469 ;; exception of `switch-to-prev-buffer' and `switch-to-next-buffer'.
2470 ;; `switch-to-prev-buffer' pushes the buffer it just replaced on it,
2471 ;; `switch-to-next-buffer' pops the last pushed buffer from it.
2473 ;; Both `prev-buffers' and `next-buffers' may reference killed buffers
2474 ;; if such a buffer was killed while the window was hidden within a
2475 ;; window configuration. Such killed buffers get removed whenever
2476 ;; `switch-to-prev-buffer' or `switch-to-next-buffer' encounter them.
2478 ;; The following function is called by `set-window-buffer' _before_ it
2479 ;; replaces the buffer of the argument window with the new buffer.
2481 "Record WINDOW's buffer.
2482 WINDOW must be a live window and defaults to the selected one."
2486 ;; Reset WINDOW's next buffers. If needed, they are resurrected by
2487 ;; `switch-to-prev-buffer' and `switch-to-next-buffer'.
2491 ;; Remove all entries for BUFFER from WINDOW's previous buffers.
2495 ;; Don't record insignificant buffers.
2497 ;; Add an entry for buffer to WINDOW's previous buffers.
2504 ;; We have an entry, update marker positions.
2507 ;; Make new markers.
2515 "Unrecord BUFFER in WINDOW.
2516 WINDOW must be a live window and defaults to the selected one.
2517 BUFFER must be a live buffer and defaults to the buffer of
2518 WINDOW."
2527 "Set WINDOW's buffer to BUFFER.
2528 Optional argument START non-nil means set WINDOW's start position
2529 to START. Optional argument POINT non-nil means set WINDOW's
2530 point to POINT. If WINDOW is selected this also sets BUFFER's
2531 `point' to POINT. If WINDOW is selected and the buffer it showed
2532 before was current this also makes BUFFER the current buffer."
2547 "In WINDOW switch to previous buffer.
2548 WINDOW must be a live window and defaults to the selected one.
2550 Optional argument BURY-OR-KILL non-nil means the buffer currently
2551 shown in WINDOW is about to be buried or killed and consequently
2552 shall not be switched to in future invocations of this command."
2556 ;; Save this since it's destroyed by `set-window-buffer'.
2558 entry new-buffer killed-buffers visible)
2563 ;; Scan WINDOW's previous buffers first, skipping entries of next
2564 ;; buffers.
2576 ;; Scan reverted buffer list of WINDOW's frame next, skipping
2577 ;; entries of next buffers. Note that when we bury or kill a
2578 ;; buffer we don't reverse the global buffer list to avoid showing
2579 ;; a buried buffer instead. Otherwise, we must reverse the global
2580 ;; buffer list in order to make sure that switching to the
2581 ;; previous/next buffer traverse it in opposite directions.
2590 ;; Try to avoid showing a buffer visible in some other window.
2596 ;; Scan reverted next buffers last (must not use nreverse
2597 ;; here!).
2599 ;; Actually, buffer _must_ be live here since otherwise it
2600 ;; would have been caught in the scan of previous buffers.
2611 ;; Show a buffer visible in another window.
2617 ;; Remove `old-buffer' from WINDOW's previous and (restored list
2618 ;; of) next buffers.
2623 ;; Move `old-buffer' to head of WINDOW's restored list of next
2624 ;; buffers.
2628 ;; Remove killed buffers from WINDOW's previous and next buffers.
2636 ;; Return new-buffer.
2637 new-buffer))
2640 "In WINDOW switch to next buffer.
2641 WINDOW must be a live window and defaults to the selected one."
2646 new-buffer entry killed-buffers visible)
2651 ;; Scan WINDOW's next buffers first.
2662 ;; Scan the buffer list of WINDOW's frame next, skipping previous
2663 ;; buffers entries.
2669 ;; Try to avoid showing a buffer visible in some other window.
2674 ;; Scan WINDOW's reverted previous buffers last (must not use
2675 ;; nreverse here!)
2686 ;; Show a buffer visible in another window.
2691 ;; Remove `new-buffer' from and restore WINDOW's next buffers.
2694 ;; Remove killed buffers from WINDOW's previous and next buffers.
2702 ;; Return new-buffer.
2703 new-buffer))
2706 "Search LIST for a valid buffer to display in FRAME.
2707 Return nil when all buffers in LIST are undesirable for display,
2708 otherwise return the first suitable buffer in LIST.
2710 Buffers not visible in windows are preferred to visible buffers,
2711 unless VISIBLE-OK is non-nil.
2712 If the optional argument FRAME is nil, it defaults to the selected frame.
2713 If BUFFER is non-nil, ignore occurrences of that buffer in LIST."
2714 ;; This logic is more or less copied from other-buffer.
2717 found buf)
2730 "Return the last buffer in FRAME's buffer list.
2731 If BUFFER is the last buffer, return the preceding buffer
2732 instead. Buffers not visible in windows are preferred to visible
2733 buffers, unless optional argument VISIBLE-OK is non-nil.
2734 Optional third argument FRAME nil or omitted means use the
2735 selected frame's buffer list. If no such buffer exists, return
2736 the buffer `*scratch*', creating it if necessary."
2739 buffer visible-ok frame)
2743 scratch)))
2746 "Put BUFFER-OR-NAME at the end of the list of all buffers.
2747 There it is the least likely candidate for `other-buffer' to
2749 select by default.
2751 You can specify a buffer name as BUFFER-OR-NAME, or an actual
2752 buffer object. If BUFFER-OR-NAME is nil or omitted, bury the
2753 current buffer. Also, if BUFFER-OR-NAME is nil or omitted,
2754 remove the current buffer from the selected window if it is
2755 displayed there."
2758 ;; If `buffer-or-name' is not on the selected frame we unrecord it
2759 ;; although it's not "here" (call it a feature).
2761 ;; Handle case where `buffer-or-name' is nil and the current buffer
2762 ;; is shown in the selected window.
2768 ;; Don't iconify if it's the only frame.
2774 ;; Always return nil.
2775 nil))
2778 "Switch to the last buffer in the buffer list."
2783 "In selected window switch to next buffer."
2790 "In selected window switch to previous buffer."
2797 "Delete all windows showing BUFFER-OR-NAME.
2798 BUFFER-OR-NAME may be a buffer or the name of an existing buffer
2799 and defaults to the current buffer.
2801 The following non-nil values of the optional argument FRAME
2802 have special meanings:
2804 - t means consider all windows on the selected frame only.
2806 - `visible' means consider all windows on all visible frames on
2807 the current terminal.
2809 - 0 (the number zero) means consider all windows on all visible
2810 and iconified frames on the current terminal.
2812 - A frame means consider all windows on that frame only.
2814 Any other value of FRAME means consider all windows on all
2815 frames.
2817 When a window showing BUFFER-OR-NAME is dedicated and the only
2818 window of its frame, that frame is deleted when there are other
2819 frames left."
2822 ;; Handle the "inverted" meaning of the FRAME argument wrt other
2823 ;; `window-list-1' based function.
2830 ;; Delete frame if and only if window is dedicated.
2833 ;; Delete window.
2836 ;; In window switch to previous buffer.
2839 ;; If a window doesn't show BUFFER, unrecord BUFFER in it.
2843 "Replace BUFFER-OR-NAME with some other buffer in all windows showing it.
2844 BUFFER-OR-NAME may be a buffer or the name of an existing buffer
2845 and defaults to the current buffer.
2847 When a window showing BUFFER-OR-NAME is either dedicated, or the
2848 window has no previous buffer, that window is deleted. If that
2849 window is the only window on its frame, the frame is deleted too
2850 when there are other frames left. If there are no other frames
2851 left, some other buffer is displayed in that window.
2853 This function removes the buffer denoted by BUFFER-OR-NAME from
2854 all window-local buffer lists."
2862 ;; Delete frame.
2865 ;; Delete window.
2868 ;; Switch to another buffer in window.
2871 ;; Unrecord BUFFER in WINDOW.
2875 "Quit WINDOW and bury its buffer.
2876 WINDOW defaults to the selected window.
2877 With a prefix argument, kill the buffer instead.
2879 According to information stored in WINDOW's `quit-restore' window
2880 parameter either \(1) delete WINDOW and its frame, \(2) delete
2881 WINDOW, \(3) restore the buffer previously displayed in WINDOW,
2882 or \(4) make WINDOW display some other buffer than the present
2883 one. If non-nil, reset `quit-restore' parameter to nil."
2888 resize)
2893 ;; WINDOW's frame can be deleted.
2895 ;; If the previously selected window is still alive, select it.
2901 ;; WINDOW's can be deleted.
2903 ;; If the previously selected window is still alive, select it.
2907 ;; The buffer currently shown in WINDOW must still be the
2908 ;; buffer shown when its `quit-restore' parameter was created
2909 ;; in the first place.
2913 ;; Display buffer stored in the quit-restore parameter.
2923 ;; Reset the quit-restore parameter.
2928 ;; Otherwise, show another buffer in WINDOW and reset the
2929 ;; quit-restore parameter.
2933 ;; Kill WINDOW's old-buffer if requested
2937 \f
2938 ;;; Splitting windows.
2940 "Return minimum height of any window when splitting windows.
2941 Optional argument HORIZONTAL non-nil means return minimum width."
2947 "Make a new window adjacent to WINDOW.
2948 WINDOW can be any window and defaults to the selected one.
2949 Return the new window which is always a live window.
2951 Optional argument SIZE a positive number means make WINDOW SIZE
2952 lines or columns tall. If SIZE is negative, make the new window
2953 -SIZE lines or columns tall. If and only if SIZE is non-nil, its
2954 absolute value can be less than `window-min-height' or
2955 `window-min-width'; so this command can make a new window as
2956 small as one line or two columns. SIZE defaults to half of
2957 WINDOW's size. Interactively, SIZE is the prefix argument.
2959 Optional third argument SIDE nil (or `below') specifies that the
2960 new window shall be located below WINDOW. SIDE `above' means the
2961 new window shall be located above WINDOW. In both cases SIZE
2962 specifies the new number of lines for WINDOW \(or the new window
2963 if SIZE is negative) including space reserved for the mode and/or
2964 header line.
2966 SIDE t (or `right') specifies that the new window shall be
2967 located on the right side of WINDOW. SIDE `left' means the new
2968 window shall be located on the left of WINDOW. In both cases
2969 SIZE specifies the new number of columns for WINDOW \(or the new
2970 window provided SIZE is negative) including space reserved for
2971 fringes and the scrollbar or a divider column. Any other non-nil
2972 value for SIDE is currently handled like t (or `right').
2974 If the variable `ignore-window-parameters' is non-nil or the
2975 `split-window' parameter of WINDOW equals t, do not process any
2976 parameters of WINDOW. Otherwise, if the `split-window' parameter
2977 of WINDOW specifies a function, call that function with all three
2978 arguments and return the value returned by that function.
2981 root of that atomic window. The new window does not become a
2982 member of that atomic window.
2984 If WINDOW is live, properties of the new window like margins and
2985 scrollbars are inherited from WINDOW. If WINDOW is an internal
2986 window, these properties as well as the buffer displayed in the
2987 new window are inherited from the window selected on WINDOW's
2988 frame. The selected window is not changed by this function."
3000 ;; Rebind `window-nest' since in some cases we may have to
3001 ;; override its value.
3003 atom-root)
3008 ;; Ignore window parameters if either `ignore-window-parameters'
3009 ;; is t or the `split-window' parameter equals t.
3012 ;; The `split-window' parameter specifies the function to call.
3013 ;; If that function is `ignore', do nothing.
3015 ;; If WINDOW is a subwindow of an atomic window, split the root
3016 ;; window of that atomic window instead.
3025 ;; WINDOW is a side root window. To make sure that a new parent
3026 ;; window gets created set `window-nest' to t.
3030 ;; If `window-splits' is non-nil and SIZE is a non-negative
3031 ;; integer, we cannot reasonably resize other windows. Rather
3032 ;; bind `window-nest' to t to make sure that subsequent window
3033 ;; deletions are handled correctly.
3037 ;; `parent-size' is the size of WINDOW's parent, provided
3038 ;; it has one.
3040 ;; `resize' non-nil means we are supposed to resize other
3041 ;; windows in WINDOW's combination.
3044 ;; Resize makes sense in iso-combinations only.
3046 ;; `old-size' is the current size of WINDOW.
3048 ;; `new-size' is the specified or calculated size of the
3049 ;; new window.
3055 ;; When resizing try to give the new window the
3056 ;; average size of a window in its combination.
3059 (/ parent-size
3061 parent horizontal))))
3062 ;; Else try to give the new window half the size
3063 ;; of WINDOW (plus an eventual odd line).
3066 ;; SIZE non-negative specifies the new size of WINDOW.
3068 ;; Note: Specifying a non-negative SIZE is practically
3069 ;; always done as workaround for making the new window
3070 ;; appear above or on the left of the new window (the
3071 ;; ispell window is a typical example of that). In all
3072 ;; these cases the SIDE argument should be set to 'above
3073 ;; or 'left in order to support the 'resize option.
3074 ;; Here we have to nest the windows instead, see above.
3077 ;; SIZE negative specifies the size of the new window.
3079 new-parent new-normal)
3081 ;; Check SIZE.
3086 ;; SIZE unspecified, resizing.
3088 ;; Try again with minimum split size.
3094 ;; SIZE unspecified, no resizing.
3099 window-safe-min-width
3100 window-safe-min-width))))
3101 ;; SIZE specified as new size of old window. If the new size
3102 ;; is larger than the old size or the size of the new window
3103 ;; would be less than the safe minimum, signal an error.
3106 ;; SIZE specified, resizing.
3108 ;; If we cannot resize the parent give up.
3114 ;; SIZE specification violates minimum size restrictions.
3120 ;; Make new-parent non-nil if we need a new parent window;
3121 ;; either because we want to nest or because WINDOW is not
3122 ;; iso-combined.
3125 ;; Make new-normal the normal size of the new window.
3133 ;; Try to get space from OLD's siblings. We could go "up" and
3134 ;; try getting additional space from surrounding windows but
3135 ;; we won't be able to return space to those windows when we
3136 ;; delete the one we create here. Hence we do not go up.
3145 ;; Get entire space from WINDOW.
3150 new-normal)))
3153 ;; Inherit window-side parameters, if any.
3160 ;; Always return the new window.
3161 new)))))
3163 ;; I think this should be the default; I think people will prefer it--rms.
3166 in both children.
3167 This is often more convenient for editing.
3168 If nil, adjust point in each of the two windows to minimize redisplay.
3169 This is convenient on slow terminals, but point can move strangely.
3171 This option applies only to `split-window-above-each-other' and
3172 functions that call it. `split-window' always keeps the original
3173 point in both children."
3178 "Split selected window into two windows, one above the other.
3179 The upper window gets SIZE lines and the lower one gets the rest.
3180 SIZE negative means the lower window gets -SIZE lines and the
3181 upper one the rest. With no argument, split windows equally or
3182 close to it. Both windows display the same buffer, now current.
3184 If the variable `split-window-keep-point' is non-nil, both new
3185 windows will get the same value of point as the selected window.
3186 This is often more convenient for editing. The upper window is
3187 the selected window.
3189 Otherwise, we choose window starts so as to minimize the amount of
3190 redisplay; this is convenient on slow terminals. The new selected
3191 window is the one that the current value of point appears in. The
3192 value of point can change if the text around point is hidden by the
3193 new mode line.
3195 Regardless of the value of `split-window-keep-point', the upper
3196 window is the original one and the return value is the new, lower
3197 window."
3202 moved-by-window-height moved new-window bottom)
3204 ;; `split-window' would not signal an error here.
3225 ;; Always copy quit-restore parameter in interactive use.
3229 new-window))
3234 "Split selected window into two windows side by side.
3235 The selected window becomes the left one and gets SIZE columns.
3236 SIZE negative means the right window gets -SIZE columns.
3238 SIZE includes the width of the window's scroll bar; if there are
3239 no scroll bars, it includes the width of the divider column to
3240 the window's right, if any. SIZE omitted or nil means split
3241 window equally.
3243 The selected window remains selected. Return the new window."
3247 new-window)
3249 ;; `split-window' would not signal an error here.
3252 ;; Always copy quit-restore parameter in interactive use.
3256 new-window))
3259 \f
3260 ;;; Balancing windows.
3262 ;; The following routine uses the recycled code from an old version of
3263 ;; `window--resize-subwindows'. It's not very pretty, but coding it the way the
3264 ;; new `window--resize-subwindows' code does would hardly make it any shorter or
3265 ;; more readable (FWIW we'd need three loops - one to calculate the
3266 ;; minimum sizes per window, one to enlarge or shrink windows until the
3267 ;; new parent-size matches, and one where we shrink the largest/enlarge
3268 ;; the smallest window).
3270 "Subroutine of `balance-windows-1'.
3271 WINDOW must be an iso-combination."
3277 found failed size sub-total sub-delta sub-amount rest)
3292 ;; Ignore subwindows that should be ignored or are stuck.
3299 ;; Register the new total size for this subwindow.
3304 ;; We failed and need a new round.
3310 ;; Fix rounding by trying to enlarge non-stuck windows by one line
3311 ;; (column) until `rest' is zero.
3319 ;; Fix rounding by trying to enlarge stuck windows by one line
3320 ;; (column) until `rest' equals zero.
3330 ;; Record new normal sizes.
3336 ;; Recursively balance each subwindow's subwindows.
3341 "Subroutine of `balance-windows'."
3353 "Balance the sizes of subwindows of WINDOW-OR-FRAME.
3354 WINDOW-OR-FRAME is optional and defaults to the selected frame.
3355 If WINDOW-OR-FRAME denotes a frame, balance the sizes of all
3356 subwindows of that frame's root window. If WINDOW-OR-FRAME
3357 denots a window, balance the sizes of all subwindows of that
3358 window."
3367 window-or-frame)
3371 ;; Balance vertically.
3375 ;; Balance horizontally.
3381 "Return t if WINDOW cannot be resized in DIRECTION.
3382 WINDOW defaults to the selected window. DIRECTION can be
3383 nil (i.e. any), `height' or `width'."
3390 ;;; A different solution to balance-windows.
3392 "Factor by which the window area should be over-estimated.
3393 This is used by `balance-windows-area'.
3398 "Wrapper around `window-resize' with error checking.
3399 Arguments WINDOW, DELTA and HORIZONTAL are passed on to that function."
3400 ;; `window-resize' may fail if delta is too large.
3407 ;;(message "adjust: %s" (error-message-string err))
3411 "Make all visible windows the same area (approximately).
3412 See also `window-area-factor' to change the relative size of
3413 specific buffers."
3416 ;; Remove fixed-size windows.
3421 next)
3422 ;; Resizing a window changes the size of surrounding windows in complex
3423 ;; ways, so it's difficult to balance them all. The introduction of
3424 ;; `adjust-window-trailing-edge' made it a bit easier, but it is still
3425 ;; very difficult to do. `balance-window' above takes an off-line
3426 ;; approach: get the whole window tree, then balance it, then try to
3427 ;; adjust the windows so they fit the result.
3428 ;; Here, instead, we take a "local optimization" approach, where we just
3429 ;; go through all the windows several times until nothing needs to be
3430 ;; changed. The main problem with this approach is that it's difficult
3431 ;; to make sure it terminates, so we use some heuristic to try and break
3432 ;; off infinite loops.
3433 ;; After a round without any change, we allow a second, to give a chance
3434 ;; to the carry to propagate a minor imbalance from the end back to
3435 ;; the beginning.
3437 ;; (message "New round")
3443 ;; (assert (eq next (or (cadr (member win wins)) (car wins))))
3461 ;; Maybe diff is actually closer to 1 than to 0.
3465 ;; Change things smoothly.
3468 ;; Make sure negligible differences don't accumulate to
3469 ;; become significant.
3471 ;; This used `adjust-window-trailing-edge' before and uses
3472 ;; `window-resize' now. Error wrapping is still needed.
3474 ;; (sit-for 0.5)
3476 ;; If the same change has been seen already for this window,
3477 ;; we're most likely in an endless loop, so don't count it as
3478 ;; a change.
3482 ;; We've now basically balanced all the windows.
3483 ;; But there may be some minor off-by-one imbalance left over,
3484 ;; so let's do some fine tuning.
3485 ;; (bw-finetune wins)
3486 ;; (message "Done in %d rounds" round)
3487 ))
3489 ;;; Window states, how to get them and how to put them in a window.
3491 "Like LIST but do not add nil elements of ARGS."
3498 "Helper function for `window-state-get'."
3508 type
3519 window-state-ignored-parameters)
3522 ;; Make a clone-of parameter.
3527 ;; All buffer related things go in here - make the buffer
3528 ;; current when retrieving `point' and `mark'.
3558 "Return state of WINDOW as a Lisp object.
3559 WINDOW can be any window and defaults to the root window of the
3560 selected frame.
3562 Optional argument MARKERS non-nil means use markers for sampling
3563 positions like `window-point' or `window-start'. MARKERS should
3564 be non-nil only if the value is used for putting the state back
3565 in the same session (note that markers slow down processing).
3567 The return value can be used as argument for `window-state-put'
3568 to put the state recorded here into an arbitrary window. The
3569 value can be also stored on disk and read back in a new session."
3573 window
3576 ;; The return value is a cons whose car specifies some constraints on
3577 ;; the size of WINDOW. The cdr lists the states of the subwindows of
3578 ;; WINDOW.
3580 ;; Frame related things would go into a function, say `frame-state',
3581 ;; calling `window-state-get' to insert the frame's root window.
3589 ;; These are probably not needed.
3598 "Helper function for `window-state-put'."
3603 ;; For a leaf window just add unprocessed entries to
3604 ;; `window-state-put-list'.
3611 size new)
3613 ;; Find the next child window. WINDOW always points to the
3614 ;; real window that we want to fill with what we find here.
3617 ;; The last child window. Below `window-state-put-1'
3618 ;; will put into it whatever ITEM has in store.
3620 ;; Not the last child window, prepare for splitting
3621 ;; WINDOW. SIZE is the new (and final) size of the old
3622 ;; window.
3625 ;; Use total size.
3627 ;; Use normalized size and round.
3631 item))))))
3633 ;; Use safe sizes, we try to resize later.
3635 window-safe-min-height
3636 window-safe-min-width)))
3640 ;; We must inherit the nesting, otherwise we might mess
3641 ;; up handling of atomic and side window.
3643 ;; Give up if we can't resize window down to safe sizes.
3648 ;; When creating the first child window add for parent
3649 ;; unprocessed entries to `window-state-put-list'.
3652 window-state-put-list))))
3654 ;; Now process the current window (either the one we've just
3655 ;; split or the last child of its parent).
3657 ;; Continue with the last window split off.
3661 "Helper function for `window-state-put'."
3670 ;; Process parameters.
3674 ;; Process buffer related state.
3676 ;; We don't want to raise an error here so we create a buffer if
3677 ;; there's none.
3689 ;; Adjust vertically.
3691 ;; A fixed height window, try to restore the original size.
3694 window-size-fixed)
3697 ;; Else check whether the window is not high enough.
3703 ;; Adjust horizontally.
3705 ;; A fixed width window, try to restore the original size.
3708 window-size-fixed)
3711 ;; Else check whether the window is not wide enough.
3717 ;; Set dedicated status.
3719 ;; Install positions (maybe we should do this after all windows
3720 ;; have been created and sized).
3724 ;; I'm not sure whether we should set the mark here, but maybe
3725 ;; it can be used.
3728 ;; Select window if it's the selected one.
3733 "Put window state STATE into WINDOW.
3734 STATE should be the state of a window returned by an earlier
3735 invocation of `window-state-get'. Optional argument WINDOW must
3736 specify a live window and defaults to the selected one.
3738 Optional argument IGNORE non-nil means ignore minimum window
3739 sizes and fixed size restrictions. IGNORE equal `safe' means
3740 subwindows can get as small as `window-safe-min-height' and
3741 `window-safe-min-width'."
3745 ;; We check here (1) whether the total sizes of root window of
3746 ;; STATE and that of WINDOW are equal so we can avoid
3747 ;; calculating new sizes, and (2) if we do have to resize
3748 ;; whether we can do so without violating size restrictions.
3756 window-splits selected)
3774 (> min-width
3776 ;; The check above might not catch all errors due to rounding
3777 ;; issues - so IGNORE equal 'safe might not always produce the
3778 ;; minimum possible state. But such configurations hardly make
3779 ;; sense anyway.
3783 ;; Work on the windows of a temporary buffer to make sure that
3784 ;; splitting proceeds regardless of any buffer local values of
3785 ;; `window-size-fixed'. Release that buffer after the buffers of
3786 ;; all live windows have been set by `window-state-put-2'.
3792 \f
3794 "Window used by `display-buffer' and related information.
3795 After `display-buffer' displays a buffer in some window this
3796 variable is a cons cell whose car denotes the window used to
3797 display the buffer. The cdr is supposed to be one of the symbols
3798 `reuse-buffer-window', `reuse-other-window', `new-window' or
3799 `new-frame'.
3801 See the function `display-buffer-record-window' for how this
3805 "Record information for window used by `display-buffer'.
3806 TYPE must be one of the symbols reuse-window, pop-up-window, or
3807 pop-up-frame. WINDOW is the window used for or created by the
3808 `display-buffer' routines. BUFFER is the buffer that shall be
3809 displayed."
3812 ;; In `display-buffer-window' record whether we used a window on the
3813 ;; same buffer or another one.
3819 ;; In quit-restore parameter record information about the old buffer
3820 ;; unless such information exists already.
3823 window 'quit-restore
3828 ;; In `display-buffer-window' record window as new.
3830 ;; In `quit-restore' parameter record that we popped up this window,
3831 ;; its buffer, and which window was selected before.
3835 ;; In `display-buffer-window' record window as on new frame.
3837 ;; In `quit-restore' parameter record that we popped up this window
3838 ;; on a new frame, the buffer, and which window was selected before.
3843 "If non-nil, function to call to handle `display-buffer'.
3844 It will receive two args, the buffer and a flag which if non-nil
3845 means that the currently selected window is not acceptable. It
3846 should choose or create a window, display the specified buffer in
3847 it, and return the window.
3849 The function specified here is responsible for setting the value
3850 of `display-buffer-window' and the quit-restore parameter of the
3851 window used."
3858 "Alist of parameters for automatically generated new frames.
3859 You can set this in your init file; for example,
3861 (setq pop-up-frame-alist '((width . 80) (height . 20)))
3863 If non-nil, the value you specify here is used by the default
3864 `pop-up-frame-function' for the creation of new frames.
3866 Since `pop-up-frame-function' is used by `display-buffer' for
3867 making new frames, any value specified here by default affects
3868 the automatic generation of new frames via `display-buffer' and
3869 all functions based on it. The behavior of `make-frame' is not
3870 affected by this variable."
3878 "Function used by `display-buffer' for creating a new frame.
3879 This function is called with no arguments and should return a new
3880 frame. The default value calls `make-frame' with the argument
3881 `pop-up-frame-alist'."
3886 "List of names of buffers that should be displayed specially.
3887 Displaying a buffer with `display-buffer' or `pop-to-buffer', if
3888 its name is in this list, displays the buffer in a way specified
3889 by `special-display-function'. `special-display-popup-frame'
3890 \(the default for `special-display-function') usually displays
3891 the buffer in a separate frame made with the parameters specified
3892 by `special-display-frame-alist'. If `special-display-function'
3893 has been set to some other function, that function is called with
3894 the buffer as first, and nil as second argument.
3896 Alternatively, an element of this list can be specified as
3897 \(BUFFER-NAME FRAME-PARAMETERS), where BUFFER-NAME is a buffer
3898 name and FRAME-PARAMETERS an alist of \(PARAMETER . VALUE) pairs.
3899 `special-display-popup-frame' will interpret such pairs as frame
3900 parameters when it creates a special frame, overriding the
3901 corresponding values from `special-display-frame-alist'.
3903 As a special case, if FRAME-PARAMETERS contains (same-window . t)
3904 `special-display-popup-frame' displays that buffer in the
3905 selected window. If FRAME-PARAMETERS contains (same-frame . t),
3906 it displays that buffer in a window on the selected frame.
3908 If `special-display-function' specifies some other function than
3909 `special-display-popup-frame', that function is called with the
3910 buffer named BUFFER-NAME as first, and FRAME-PARAMETERS as second
3911 argument.
3913 Finally, an element of this list can be also specified as
3914 \(BUFFER-NAME FUNCTION OTHER-ARGS). In that case,
3915 `special-display-popup-frame' will call FUNCTION with the buffer
3916 named BUFFER-NAME as first argument, and OTHER-ARGS as the
3917 second. If `special-display-function' specifies some other
3918 function, that function is called with the buffer named
3919 BUFFER-NAME as first, and the element's cdr as second argument.
3920 In any case, that function is responsible for setting the value
3921 of `display-buffer-window' and the quit-restore parameter of the
3922 window used.
3925 name to it but the corresponding buffer is displayed in the
3926 selected window, look at the values of `same-window-buffer-names'
3927 and `same-window-regexps'. Those variables take precedence over
3928 this one.
3930 See also `special-display-regexps'."
3952 ;;;###autoload
3956 "List of regexps saying which buffers should be displayed specially.
3957 Displaying a buffer with `display-buffer' or `pop-to-buffer', if
3958 any regexp in this list matches its name, displays it specially
3959 using `special-display-function'. `special-display-popup-frame'
3960 \(the default for `special-display-function') usually displays
3961 the buffer in a separate frame made with the parameters specified
3962 by `special-display-frame-alist'. If `special-display-function'
3963 has been set to some other function, that function is called with
3964 the buffer as first, and nil as second argument.
3966 Alternatively, an element of this list can be specified as
3967 \(REGEXP FRAME-PARAMETERS), where REGEXP is a regexp as above and
3968 FRAME-PARAMETERS an alist of (PARAMETER . VALUE) pairs.
3969 `special-display-popup-frame' will then interpret these pairs as
3970 frame parameters when creating a special frame for a buffer whose
3971 name matches REGEXP, overriding the corresponding values from
3972 `special-display-frame-alist'.
3974 As a special case, if FRAME-PARAMETERS contains (same-window . t)
3975 `special-display-popup-frame' displays buffers matching REGEXP in
3976 the selected window. \(same-frame . t) in FRAME-PARAMETERS means
3977 to display such buffers in a window on the selected frame.
3979 If `special-display-function' specifies some other function than
3980 `special-display-popup-frame', that function is called with the
3981 buffer whose name matched REGEXP as first, and FRAME-PARAMETERS
3982 as second argument.
3984 Finally, an element of this list can be also specified as
3985 \(REGEXP FUNCTION OTHER-ARGS). `special-display-popup-frame'
3986 will then call FUNCTION with the buffer whose name matched
3987 REGEXP as first, and OTHER-ARGS as second argument. If
3988 `special-display-function' specifies some other function, that
3989 function is called with the buffer whose name matched REGEXP
3990 as first, and the element's cdr as second argument.
3993 name to it but the corresponding buffer is displayed in the
3994 selected window, look at the values of `same-window-buffer-names'
3995 and `same-window-regexps'. Those variables take precedence over
3996 this one.
3998 See also `special-display-buffer-names'."
4021 "Return non-nil if a buffer named BUFFER-NAME gets a special frame.
4022 More precisely, return t if `special-display-buffer-names' or
4023 `special-display-regexps' contain a string entry equaling or
4024 matching BUFFER-NAME. If `special-display-buffer-names' or
4025 `special-display-regexps' contain a list entry whose car equals
4026 or matches BUFFER-NAME, the return value is the cdr of that
4027 entry."
4032 t)
4047 "Alist of parameters for special frames.
4048 Special frames are used for buffers whose names are listed in
4049 `special-display-buffer-names' and for buffers whose names match
4050 one of the regular expressions in `special-display-regexps'.
4052 This variable can be set in your init file, like this:
4054 (setq special-display-frame-alist '((width . 80) (height . 20)))
4056 These supersede the values given in `default-frame-alist'."
4063 "Display BUFFER and return the window chosen.
4064 If BUFFER is already displayed in a visible or iconified frame,
4065 raise that frame. Otherwise, display BUFFER in a new frame.
4067 Optional argument ARGS is a list specifying additional
4068 information.
4070 If ARGS is an alist, use it as a list of frame parameters. If
4071 these parameters contain \(same-window . t), display BUFFER in
4072 the selected window. If they contain \(same-frame . t), display
4073 BUFFER in a window of the selected frame.
4075 If ARGS is a list whose car is a symbol, use (car ARGS) as a
4076 function to do the work. Pass it BUFFER as first argument,
4077 and (cdr ARGS) as second."
4082 ;; If we have a window already, make it visible.
4088 window))
4089 ;; Reuse the current window if the user requested it.
4094 ;; Stay on the same frame if requested.
4097 pop-up-frames
4098 special-display-buffer-names special-display-regexps)
4100 ;; If no window yet, make one in a new frame.
4111 "Function to call for displaying special buffers.
4112 This function is called with two arguments - the buffer and,
4113 optionally, a list - and should return a window displaying that
4114 buffer. The default value usually makes a separate frame for the
4115 buffer using `special-display-frame-alist' to specify the frame
4116 parameters. See the definition of `special-display-popup-frame'
4117 for how to specify such a function.
4119 A buffer is special when its name is either listed in
4120 `special-display-buffer-names' or matches a regexp in
4121 `special-display-regexps'.
4123 The function specified here is responsible for setting the value
4124 of `display-buffer-window' and the quit-restore parameter of the
4125 window used."
4131 `display-buffer' and `pop-to-buffer' show a buffer whose name is
4132 on this list in the selected rather than some other window.
4134 An element of this list can be a cons cell instead of just a
4135 string. In that case, the cell's car must be a string specifying
4136 the buffer name. This is for compatibility with
4137 `special-display-buffer-names'; the cdr of the cons cell is
4138 ignored.
4140 See also `same-window-regexps'."
4146 `display-buffer' and `pop-to-buffer' show a buffer whose name
4147 matches a regexp on this list in the selected rather than some
4148 other window.
4150 An element of this list can be a cons cell instead of just a
4151 string. In that case, the cell's car must be a regexp matching
4152 the buffer name. This is for compatibility with
4153 `special-display-regexps'; the cdr of the cons cell is ignored.
4155 See also `same-window-buffer-names'."
4161 This function returns non-nil if `display-buffer' or
4162 `pop-to-buffer' would show a buffer named BUFFER-NAME in the
4163 selected rather than \(as usual\) some other window. See
4164 `same-window-buffer-names' and `same-window-regexps'."
4167 ;; The elements of `same-window-buffer-names' can be buffer
4168 ;; names or cons cells whose cars are buffer names.
4173 ;; The elements of `same-window-regexps' can be regexps
4174 ;; or cons cells whose cars are regexps.
4182 "Whether `display-buffer' should make a separate frame.
4183 If nil, never make a separate frame.
4184 If the value is `graphic-only', make a separate frame
4185 on graphic displays only.
4186 Any other non-nil value means always make a separate frame."
4194 "Non-nil means `display-buffer' should reuse frames.
4195 If the buffer in question is already displayed in a frame, raise
4196 that frame."
4202 "Non-nil means `display-buffer' should make a new window."
4207 "Function called by `display-buffer' routines to split a window.
4208 This function is called with a window as single argument and is
4209 supposed to split that window and return the new window. If the
4210 window can (or shall) not be split, it is supposed to return nil.
4211 The default is to call the function `split-window-sensibly' which
4212 tries to split the window in a way which seems most suitable.
4213 You can customize the options `split-height-threshold' and/or
4214 `split-width-threshold' in order to have `split-window-sensibly'
4215 prefer either vertical or horizontal splitting.
4217 If you set this to any other function, bear in mind that the
4218 `display-buffer' routines may call this function two times. The
4219 argument of the first call is the largest window on its frame.
4220 If that call fails to return a live window, the function is
4221 called again with the least recently used window as argument. If
4222 that call fails too, `display-buffer' will use an existing window
4223 to display its buffer.
4225 The window selected at the time `display-buffer' was invoked is
4226 still selected when this function is called. Hence you can
4227 compare the window argument with the value of `selected-window'
4228 if you intend to split the selected window instead or if you do
4229 not want to split the selected window."
4235 "Minimum height for splitting windows sensibly.
4236 If this is an integer, `split-window-sensibly' may split a window
4237 vertically only if it has at least this many lines. If this is
4238 nil, `split-window-sensibly' is not allowed to split a window
4239 vertically. If, however, a window is the only window on its
4240 frame, `split-window-sensibly' may split it vertically
4241 disregarding the value of this variable."
4247 "Minimum width for splitting windows sensibly.
4248 If this is an integer, `split-window-sensibly' may split a window
4249 horizontally only if it has at least this many columns. If this
4250 is nil, `split-window-sensibly' is not allowed to split a window
4251 horizontally."
4257 "Return non-nil if `split-window-sensibly' may split WINDOW.
4258 Optional argument HORIZONTAL nil or omitted means check whether
4259 `split-window-sensibly' may split WINDOW vertically. HORIZONTAL
4260 non-nil means check whether WINDOW may be split horizontally.
4262 WINDOW may be split vertically when the following conditions
4263 hold:
4264 - `window-size-fixed' is either nil or equals `width' for the
4265 buffer of WINDOW.
4266 - `split-height-threshold' is an integer and WINDOW is at least as
4267 high as `split-height-threshold'.
4268 - When WINDOW is split evenly, the emanating windows are at least
4269 `window-min-height' lines tall and can accommodate at least one
4270 line plus - if WINDOW has one - a mode line.
4272 WINDOW may be split horizontally when the following conditions
4273 hold:
4274 - `window-size-fixed' is either nil or equals `height' for the
4275 buffer of WINDOW.
4276 - `split-width-threshold' is an integer and WINDOW is at least as
4277 wide as `split-width-threshold'.
4278 - When WINDOW is split evenly, the emanating windows are at least
4279 `window-min-width' or two (whichever is larger) columns wide."
4283 ;; A window can be split horizontally when its width is not
4284 ;; fixed, it is at least `split-width-threshold' columns wide
4285 ;; and at least twice as wide as `window-min-width' and 2 (the
4286 ;; latter value is hardcoded).
4288 ;; Testing `window-full-width-p' here hardly makes any
4289 ;; sense nowadays. This can be done more intuitively by
4290 ;; setting up `split-width-threshold' appropriately.
4295 ;; A window can be split vertically when its height is not
4296 ;; fixed, it is at least `split-height-threshold' lines high,
4297 ;; and it is at least twice as high as `window-min-height' and 2
4298 ;; if it has a modeline or 1.
4307 "Split WINDOW in a way suitable for `display-buffer'.
4308 If `split-height-threshold' specifies an integer, WINDOW is at
4309 least `split-height-threshold' lines tall and can be split
4310 vertically, split WINDOW into two windows one above the other and
4311 return the lower window. Otherwise, if `split-width-threshold'
4312 specifies an integer, WINDOW is at least `split-width-threshold'
4313 columns wide and can be split horizontally, split WINDOW into two
4314 windows side by side and return the window on the right. If this
4315 can't be done either and WINDOW is the only window on its frame,
4316 try to split WINDOW vertically disregarding any value specified
4317 by `split-height-threshold'. If that succeeds, return the lower
4318 window. Return nil otherwise.
4320 By default `display-buffer' routines call this function to split
4321 the largest or least recently used window. To change the default
4322 customize the option `split-window-preferred-function'.
4324 You can enforce this function to not split WINDOW horizontally,
4325 by setting \(or binding) the variable `split-width-threshold' to
4326 nil. If, in addition, you set `split-height-threshold' to zero,
4327 chances increase that this function does split WINDOW vertically.
4329 In order to not split WINDOW vertically, set \(or bind) the
4330 variable `split-height-threshold' to nil. Additionally, you can
4331 set `split-width-threshold' to zero to make a horizontal split
4332 more likely to occur.
4334 Have a look at the function `window-splittable-p' if you want to
4335 know how `split-window-sensibly' determines whether WINDOW can be
4336 split."
4338 ;; Split window vertically.
4342 ;; Split window horizontally.
4347 ;; If WINDOW is the only window on its frame and is not the
4348 ;; minibuffer window, try to split it vertically disregarding
4349 ;; the value of `split-height-threshold'.
4356 "Try to split WINDOW.
4357 Return value returned by `split-window-preferred-function' if it
4358 represents a live window, nil otherwise."
4362 ;; Since `split-window-preferred-function' might
4363 ;; throw an error use `condition-case'.
4370 "Return FRAME if it can be used to display a buffer."
4373 ;; `frame-root-window' may be an internal window which is considered
4374 ;; "dead" by `window-live-p'. Hence if `window' is not live we
4375 ;; implicitly know that `frame' has a visible window we can use.
4378 ;; If the window is soft-dedicated, the frame is usable.
4379 ;; Actually, even if the window is really dedicated,
4380 ;; the frame is still usable by splitting it.
4381 ;; At least Emacs-22 allowed it, and it is desirable
4382 ;; when displaying same-frame windows.
4383 nil ; (eq t (window-dedicated-p window))
4384 ))
4385 frame))))
4388 "If non-nil `display-buffer' will try to even window heights.
4389 Otherwise `display-buffer' will leave the window configuration
4390 alone. Heights are evened only when `display-buffer' chooses a
4391 window that appears above or below the selected window."
4396 "Even heights of WINDOW and selected window.
4397 Do this only if these windows are vertically adjacent to each
4398 other, `even-window-heights' is non-nil, and the selected window
4399 is higher than WINDOW."
4402 ;; Don't resize minibuffer windows.
4413 ;; Don't throw an error if we can't even window heights for
4414 ;; whatever reason.
4420 "Raise the frame containing WINDOW.
4421 Do not raise the selected frame. Return WINDOW."
4425 ;; Assume the selected frame is already visible enough.
4427 ;; Assume the frame from which we invoked the minibuffer
4428 ;; is visible.
4432 window))
4435 "Display BUFFER in WINDOW and make its frame visible.
4436 Set `window-dedicated-p' to DEDICATED if non-nil.
4437 Return WINDOW."
4445 "If non-nil, `display-buffer' marks the windows it creates as dedicated.
4446 The actual non-nil value of this variable will be copied to the
4450 "Normalize BUFFER-OR-NAME argument for buffer display functions.
4451 If BUFFER-OR-NAME is nil, return the curent buffer. Else, if a
4452 buffer specified by BUFFER-OR-NAME exists, return that buffer.
4453 If no such buffer exists, create a buffer with the name
4454 BUFFER-OR-NAME and return that buffer."
4459 buffer))
4479 ,display-buffer--action-function-custom-type
4484 :key-type symbol
4489 "Alist of conditional actions for `display-buffer'.
4490 This is a list of elements (CONDITION . ACTION), where:
4492 CONDITION is either a regexp matching buffer names, or a function
4493 that takes a buffer and returns a boolean.
4495 ACTION is a cons cell (FUNCTION . ALIST), where FUNCTION is a
4496 function or a list of functions. Each such function should
4497 accept 2 arguments: a buffer to display and an alist of the
4498 same form as ALIST. See `display-buffer' for details."
4501 regexp
4504 :risky t
4510 display-buffer-reuse-window
4511 display-buffer--special
4512 display-buffer--maybe-pop-up-frame-or-window
4513 display-buffer-use-some-window
4514 ;; If all else fails, pop up a new frame.
4515 display-buffer-pop-up-frame))
4516 "List of default actions for `display-buffer'.
4517 It should be a cons cell (FUNCTION . ALIST), where FUNCTION is a
4518 function or a list of functions. Each function should accept 2
4519 arguments: a buffer to display and an alist similar to ALIST.
4520 See `display-buffer' for details."
4521 :type display-buffer--action-custom-type
4522 :risky t
4527 "Overriding action to perform to display a buffer.
4528 It should be a cons cell (FUNCTION . ALIST), where FUNCTION is a
4529 function or a list of functions. Each function should accept 2
4530 arguments: a buffer to display and an alist similar to ALIST.
4531 See `display-buffer' for details."
4532 :type display-buffer--action-custom-type
4533 :risky t
4538 "Retrieve ALIST entry corresponding to BUFFER-NAME."
4557 display-buffer--special
4558 display-buffer-pop-up-frame)
4565 "Display BUFFER-OR-NAME in some window, without selecting it.
4566 BUFFER-OR-NAME must be a buffer or the name of an existing
4567 buffer. Return the window chosen for displaying BUFFER-OR-NAME,
4568 or nil if no such window is found.
4570 Optional argument ACTION should have the form (FUNCTION . ALIST).
4571 FUNCTION is either a function or a list of functions. Each such
4572 function is called with 2 arguments: the buffer to display and an
4573 alist. It should either display the buffer and return the
4574 window, or return nil if unable to display the buffer.
4576 `display-buffer' builds a function list and an alist from
4577 `display-buffer-overriding-action', `display-buffer-alist',
4578 ACTION, and `display-buffer-default-action' (in that order).
4579 Then it calls each function in the combined function list in
4580 turn, passing the buffer as the first argument and the combined
4581 alist as the second argument, until a function returns non-nil.
4583 Available action functions include:
4584 `display-buffer-same-window'
4585 `display-buffer-reuse-window'
4586 `display-buffer-pop-up-frame'
4587 `display-buffer-pop-up-window'
4588 `display-buffer-use-some-window'
4590 Recognized alist entries include:
4592 `inhibit-same-window' -- A non-nil value prevents the same
4593 window from being used for display.
4595 `reusable-frames' -- Value specifies frame(s) to search for a
4596 window that already displays the buffer.
4597 See `display-buffer-reuse-window'.
4599 The ACTION argument to `display-buffer' can also have a non-nil
4600 and non-list value. This means to display the buffer in a window
4601 other than the selected one, even if it is already displayed in
4602 the selected window. If called interactively with a prefix
4603 argument, ACTION is t.
4605 Optional argument FRAME, if non-nil, acts like an additional
4606 ALIST entry (reusable-frames . FRAME), specifying the frame(s) to
4607 search for a window that is already displaying the buffer. See
4608 `display-buffer-reuse-window'."
4612 ;; Handle the old form of the first argument.
4616 ;; If `display-buffer-function' is defined, let it do the job.
4618 ;; Otherwise, use the defined actions.
4621 display-buffer-alist))
4622 ;; Extra actions from the arguments to this function:
4628 ;; Construct action function list and action alist.
4630 user-action action extra-action
4631 display-buffer-default-action))
4636 actions)))
4638 window)
4644 window))))
4647 "Display buffer BUFFER in another frame.
4648 This uses the function `display-buffer' as a subroutine; see
4649 its documentation for additional customization information."
4653 ;;; `display-buffer' action functions:
4656 "Display BUFFER in the selected window.
4657 This fails if ALIST has a non-nil `inhibit-same-window' entry, or
4658 if the selected window is a minibuffer window or is dedicated to
4659 another buffer; in that case, return nil. Otherwise, return the
4660 selected window."
4668 "Conditionally display BUFFER in the selected window.
4669 If `same-window-p' returns non-nil for BUFFER's name, call
4670 `display-buffer-same-window' and return its value. Otherwise,
4671 return nil."
4676 "Return a window that is already displaying BUFFER.
4677 Return nil if no usable window is found.
4679 If ALIST has a non-nil `inhibit-same-window' entry, the selected
4680 window is not eligible for reuse.
4682 If ALIST contains a `reusable-frames' entry, its value determines
4683 which frames to search for a reusable window:
4684 nil -- the selected frame (actually the last non-minibuffer frame)
4685 A frame -- just that frame
4686 `visible' -- all visible frames
4687 0 -- all frames on the current terminal
4688 t -- all frames.
4690 If ALIST contains no `reusable-frames' entry, search just the
4691 selected frame if `display-buffer-reuse-frames' and
4692 `pop-up-frames' are both nil; search all frames on the current
4693 terminal if either of those variables is non-nil."
4698 pop-up-frames)
4707 frames))))))
4713 "Try to display BUFFER using `special-display-function'.
4714 Call `special-display-p' on BUFFER's name, and if that returns
4715 non-nil, call `special-display-function' on BUFFER."
4717 ;; `special-display-p' returns either t or a list of frame
4718 ;; parameters to pass to `special-display-function'.
4725 "Display BUFFER in a new frame.
4726 This works by calling `pop-up-frame-function'. If successful,
4727 return the window used; otherwise return nil."
4729 frame window)
4735 ;; Reset list of WINDOW's previous buffers to nil.
4737 window)))
4740 "Display BUFFER by popping up a new window.
4741 The new window is created on the selected frame, or in
4742 `last-nonminibuffer-frame' if no windows can be created there.
4743 If sucessful, return the new window; otherwise return nil."
4746 window)
4748 ;; If the selected frame cannot be split, look at
4749 ;; `last-nonminibuffer-frame'.
4754 ;; Attempt to split largest or least recently used window.
4761 ;; Reset list of WINDOW's previous buffers to nil.
4763 window)))
4766 "Try displaying BUFFER based on `pop-up-frames' or `pop-up-windows'.
4768 If `pop-up-frames' is non-nil (and not `graphic-only' on a
4769 text-only terminal), try with `display-buffer-pop-up-frame'.
4771 If that cannot be done, and `pop-up-windows' is non-nil, try
4772 again with `display-buffer-pop-up-window'."
4775 pop-up-frames)
4781 "Display BUFFER in an existing window.
4782 Search for a usable window, set that window to the buffer, and
4783 return the window. If no suitable window is found, return nil."
4786 ;; When NOT-THIS-WINDOW is non-nil, temporarily dedicate the
4787 ;; selected window to its buffer, to prevent any of the
4788 ;; `get-' routines below from choosing it. (Bug#1415)
4794 window)
4797 ;; Reuse an existing window.
4802 window))
4807 window))
4810 ;; Restore dedicated status of selected window.
4817 ;;; Display + selection commands:
4820 "Select buffer BUFFER in some window, preferably a different one.
4821 BUFFER may be a buffer, a string (a buffer name), or nil. If it
4822 is a string not naming an existent buffer, create a buffer with
4823 that name. If BUFFER is nil, choose some other buffer. Return
4824 the buffer.
4826 This uses `display-buffer' as a subroutine. The optional ACTION
4827 argument is passed to `display-buffer' as its ACTION argument.
4828 See `display-buffer' for more information. ACTION is t if called
4829 interactively with a prefix argument, which means to pop to a
4830 window other than the selected one even if the buffer is already
4831 displayed in the selected window.
4833 If the window to show BUFFER is not on the selected
4834 frame, raise that window's frame and give it input focus.
4836 Optional third arg NORECORD non-nil means do not put this buffer
4837 at the front of the list of recently selected ones."
4847 ;; Make sure new window is selected (Bug#8615), (Bug#6954).
4849 ;; If `display-buffer' has chosen another frame, make sure it
4850 ;; gets input focus.
4852 buffer))
4855 "Read the name of a buffer to switch to, prompting with PROMPT.
4856 Return the neame of the buffer as a string.
4858 This function is intended for the `switch-to-buffer' family of
4859 commands since these need to omit the name of the current buffer
4860 from the list of completions and default values."
4865 ;; Since rbts-completion-table is built dynamically, we
4866 ;; can't just add it to the default value of
4867 ;; icomplete-with-completion-tables, so we add it
4868 ;; here manually.
4873 icomplete-with-completion-tables))))
4878 "Normalize BUFFER-OR-NAME argument of buffer switching functions.
4879 If BUFFER-OR-NAME is nil, return the buffer returned by
4880 `other-buffer'. Else, if a buffer specified by BUFFER-OR-NAME
4881 exists, return that buffer. If no such buffer exists, create a
4882 buffer with the name BUFFER-OR-NAME and return that buffer."
4887 buffer))
4891 "Switch to buffer BUFFER-OR-NAME in the selected window.
4892 If called interactively, prompt for the buffer name using the
4893 minibuffer. The variable `confirm-nonexistent-file-or-buffer'
4894 determines whether to request confirmation before creating a new
4895 buffer.
4897 BUFFER-OR-NAME may be a buffer, a string \(a buffer name), or
4898 nil. If BUFFER-OR-NAME is a string that does not identify an
4899 existing buffer, create a buffer with that name. If
4900 BUFFER-OR-NAME is nil, switch to the buffer returned by
4901 `other-buffer'.
4903 Optional argument NORECORD non-nil means do not put the buffer
4904 specified by BUFFER-OR-NAME at the front of the buffer list and
4905 do not make the window displaying it the most recently selected
4906 one.
4908 If FORCE-SAME-WINDOW is non-nil, BUFFER-OR-NAME must be displayed
4909 in the currently selected window; signal an error if that is
4910 impossible (e.g. if the selected window is minibuffer-only).
4911 If non-nil, BUFFER-OR-NAME may be displayed in another window.
4913 Return the buffer switched to."
4920 ;; Don't call set-window-buffer if it's not needed since it
4921 ;; might signal an error (e.g. if the window is dedicated).
4934 "Select the buffer specified by BUFFER-OR-NAME in another window.
4935 BUFFER-OR-NAME may be a buffer, a string \(a buffer name), or
4936 nil. Return the buffer switched to.
4938 If called interactively, prompt for the buffer name using the
4939 minibuffer. The variable `confirm-nonexistent-file-or-buffer'
4940 determines whether to request confirmation before creating a new
4941 buffer.
4943 If BUFFER-OR-NAME is a string and does not identify an existing
4944 buffer, create a new buffer with that name. If BUFFER-OR-NAME is
4945 nil, switch to the buffer returned by `other-buffer'.
4947 Optional second argument NORECORD non-nil means do not put this
4948 buffer at the front of the list of recently selected ones.
4950 This uses the function `display-buffer' as a subroutine; see its
4951 documentation for additional customization information."
4958 "Switch to buffer BUFFER-OR-NAME in another frame.
4959 BUFFER-OR-NAME may be a buffer, a string \(a buffer name), or
4960 nil. Return the buffer switched to.
4962 If called interactively, prompt for the buffer name using the
4963 minibuffer. The variable `confirm-nonexistent-file-or-buffer'
4964 determines whether to request confirmation before creating a new
4965 buffer.
4967 If BUFFER-OR-NAME is a string and does not identify an existing
4968 buffer, create a new buffer with that name. If BUFFER-OR-NAME is
4969 nil, switch to the buffer returned by `other-buffer'.
4971 Optional second arg NORECORD non-nil means do not put this
4972 buffer at the front of the list of recently selected ones.
4974 This uses the function `display-buffer' as a subroutine; see its
4975 documentation for additional customization information."
4979 \f
4981 "Set the height in lines of the text display area of WINDOW to HEIGHT.
4982 WINDOW must be a live window. HEIGHT doesn't include the mode
4983 line or header line, if any, or any partial-height lines in the
4984 text display area.
4986 Note that the current implementation of this function cannot
4987 always set the height exactly, but attempts to be conservative,
4988 by allocating more lines than are actually needed in the case
4989 where some error may be present."
4993 ;; Setting window-min-height to a value like 1 can lead to very
4994 ;; bizarre displays because it also allows Emacs to make *other*
4995 ;; windows 1-line tall, which means that there's no more space for
4996 ;; the modeline.
5001 "Make selected window DELTA columns wider.
5002 Interactively, if no argument is given, make selected window one
5003 column wider."
5008 "Make selected window DELTA columns narrower.
5009 Interactively, if no argument is given, make selected window one
5010 column narrower."
5015 "Return the number of screen lines in the region.
5016 The number of screen lines may be different from the number of actual lines,
5017 due to line breaking, display table, etc.
5019 Optional arguments BEG and END default to `point-min' and `point-max'
5020 respectively.
5022 If region ends with a newline, ignore it unless optional third argument
5023 COUNT-FINAL-NEWLINE is non-nil.
5025 The optional fourth argument WINDOW specifies the window used for obtaining
5026 parameters such as width, horizontal scrolling, and so on. The default is
5027 to use the selected window's parameters.
5029 Like `vertical-motion', `count-screen-lines' always uses the current buffer,
5030 regardless of which buffer is displayed in WINDOW. This makes possible to use
5031 `count-screen-lines' in any buffer, whether or not it is currently displayed
5032 in some window."
5038 0
5051 "Return the height (in screen lines) of the buffer that WINDOW is displaying."
5055 ;; If buffer ends with a newline, ignore it when
5056 ;; counting height unless point is after it.
5058 window))))
5060 ;;; Resizing buffers to fit their contents exactly.
5062 "Adjust height of WINDOW to display its buffer's contents exactly.
5063 WINDOW can be any live window and defaults to the selected one.
5065 Optional argument MAX-HEIGHT specifies the maximum height of
5066 WINDOW and defaults to the height of WINDOW's frame. Optional
5067 argument MIN-HEIGHT specifies the minimum height of WINDOW and
5068 defaults to `window-min-height'. Both, MAX-HEIGHT and MIN-HEIGHT
5069 are specified in lines and include the mode line and header line,
5070 if any.
5072 Optional argument OVERRIDE non-nil means override restrictions
5073 imposed by `window-min-height' and `window-min-width' on the size
5074 of WINDOW.
5076 Return the number of lines by which WINDOW was enlarged or
5077 shrunk. If an error occurs during resizing, return nil but don't
5078 signal an error.
5080 Note that even if this function makes WINDOW large enough to show
5081 _all_ lines of its buffer you might not see the first lines when
5082 WINDOW was scrolled."
5084 ;; Do all the work in WINDOW and its buffer and restore the selected
5085 ;; window and the current buffer when we're done.
5087 ;; Can't resize a full height or fixed-size window.
5090 ;; `with-selected-window' should orderly restore the current buffer.
5092 ;; We are in WINDOW's buffer now.
5098 window-safe-min-height)))
5101 ;; Adjust MAX-HEIGHT.
5104 max-window-height
5106 ;; Make `desired-height' the height necessary to show
5107 ;; all of WINDOW's buffer, constrained by MIN-HEIGHT
5108 ;; and MAX-HEIGHT.
5113 ;; For non-minibuffers count the mode line, if any.
5115 mode-line-format)
5116 1
5118 ;; Count the header line, if any.
5120 max-height)
5121 min-height))
5130 ;; This `condition-case' shouldn't be necessary, but who knows?
5133 ;; Return zero if DELTA became zero in the proces.
5134 0
5135 ;; Don't try to redisplay with the cursor at the end on its
5136 ;; own line--that would force a scroll and spoil things.
5138 ;; It's silly to put `point' at the end of the previous
5139 ;; line and so maybe force horizontal scrolling.
5141 ;; Call `window-resize' with OVERRIDE argument equal WINDOW.
5143 ;; Check if the last line is surely fully visible. If
5144 ;; not, enlarge the window.
5148 ;; Don't include final newline.
5151 ;; If line-wrapping is turned off, test the
5152 ;; beginning of the last line for
5153 ;; visibility instead of the end, as the
5154 ;; end of the line could be invisible by
5155 ;; virtue of extending past the edge of the
5156 ;; window.
5160 ;; This loop might in some rare pathological cases raise
5161 ;; an error - another reason for the `condition-case'.
5168 delta))))
5171 "Return t if WINDOW can be shrunk without shrinking other windows.
5172 WINDOW defaults to the selected window."
5175 ;; The following doesn't satisfy the doc-string's claim when
5176 ;; window and previous-/next-window are not part of the same
5177 ;; combination but still share a common edge. Using
5178 ;; `window-iso-combined-p' instead should handle that.
5181 ;; (make-obsolete
5182 ;; 'window-safely-shrinkable-p "use `window-iso-combined-p' instead." "24.1")
5185 "Shrink height of WINDOW if its buffer doesn't need so many lines.
5186 More precisely, shrink WINDOW vertically to be as small as
5187 possible, while still showing the full contents of its buffer.
5188 WINDOW defaults to the selected window.
5190 Do not shrink WINDOW to less than `window-min-height' lines. Do
5191 nothing if the buffer contains more lines than the present window
5192 height, or if some of the window's contents are scrolled out of
5193 view, or if shrinking this window would also shrink another
5194 window, or if the window is the only window of its frame.
5196 Return non-nil if the window was shrunk, nil otherwise."
5199 ;; Make sure that WINDOW is vertically combined and `point-min' is
5200 ;; visible (for whatever reason that's needed). The remaining issues
5201 ;; should be taken care of by `fit-window-to-buffer'.
5205 \f
5207 "Kill the current buffer and delete the selected window."
5216 ;; If `delete-window' failed before, we rerun it to regenerate
5217 ;; the error so it can be seen in the echo area.
5220 ;; If the buffer is not dead for some reason (probably because
5221 ;; of a `quit' signal), remove the hook again.
5226 \f
5228 "Indicates the last recenter operation performed.
5232 "Cycling order for `recenter-top-bottom'.
5233 A list of elements with possible values `top', `middle', `bottom',
5234 integer or float numbers that define the cycling order for
5235 the command `recenter-top-bottom'.
5237 Top and bottom destinations are `scroll-margin' lines the from true
5238 window top and bottom. Middle redraws the frame and centers point
5239 vertically within the window. Integer number moves current line to
5240 the specified absolute window-line. Float number between 0.0 and 1.0
5241 means the percentage of the screen space from the top. The default
5242 cycling order is middle -> top -> bottom."
5253 "Move current buffer line to the specified window line.
5254 With no prefix argument, successive calls place point according
5255 to the cycling order defined by `recenter-positions'.
5257 A prefix argument is handled like `recenter':
5258 With numeric prefix ARG, move current line to window-line ARG.
5259 With plain `C-u', move current line to window center."
5267 recenter-positions))
5286 "Position point relative to window.
5288 With a prefix argument ARG, acts like `move-to-window-line'.
5290 With no argument, positions point at center of window.
5291 Successive calls position point at positions defined
5292 by `recenter-positions'."
5300 recenter-positions))
5317 \f
5318 ;;; Scrolling commands.
5320 ;;; Scrolling commands which does not signal errors at top/bottom
5321 ;;; of buffer at first key-press (instead moves to top/bottom
5322 ;;; of buffer).
5325 "Move point to top/bottom of buffer before signalling a scrolling error.
5326 A value of nil means just signal an error if no more scrolling possible.
5327 A value of t means point moves to the beginning or the end of the buffer
5328 \(depending on scrolling direction) when no more scrolling possible.
5329 When point is already on that position, then signal an error."
5335 "Scroll text of selected window upward ARG lines; or near full screen if no ARG.
5336 If `scroll-error-top-bottom' is non-nil and `scroll-up' cannot
5337 scroll window further, move cursor to the bottom line.
5338 When point is already on that position, then signal an error.
5339 A near full screen is `next-screen-context-lines' less than a full screen.
5340 Negative ARG means scroll downward.
5341 If ARG is the atom `-', scroll downward by nearly full screen."
5357 ;; When scrolling by ARG lines can't be done,
5358 ;; move by ARG lines instead.
5360 ;; When ARG is nil for full-screen scrolling,
5361 ;; move to the bottom of the buffer.
5367 "Scroll text of selected window down ARG lines; or near full screen if no ARG.
5368 If `scroll-error-top-bottom' is non-nil and `scroll-down' cannot
5369 scroll window further, move cursor to the top line.
5370 When point is already on that position, then signal an error.
5371 A near full screen is `next-screen-context-lines' less than a full screen.
5372 Negative ARG means scroll upward.
5373 If ARG is the atom `-', scroll upward by nearly full screen."
5389 ;; When scrolling by ARG lines can't be done,
5390 ;; move by ARG lines instead.
5392 ;; When ARG is nil for full-screen scrolling,
5393 ;; move to the top of the buffer.
5398 ;;; Scrolling commands which scroll a line instead of full screen.
5401 "Scroll text of selected window upward ARG lines; or one line if no ARG.
5402 If ARG is omitted or nil, scroll upward by one line.
5403 This is different from `scroll-up-command' that scrolls a full screen."
5410 "Scroll text of selected window down ARG lines; or one line if no ARG.
5411 If ARG is omitted or nil, scroll down by one line.
5412 This is different from `scroll-down-command' that scrolls a full screen."
5418 \f
5421 For more details, see the documentation for `scroll-other-window'."
5424 ;; Just invert the argument's meaning.
5425 ;; We can do that without knowing which window it will be.
5431 "Move point to the beginning of the buffer in the other window.
5432 Leave mark at previous position.
5433 With arg N, put point N/10 of the way from the true beginning."
5437 ;; We use unwind-protect rather than save-window-excursion
5438 ;; because the latter would preserve the things we want to change.
5442 ;; Set point and mark in that window's buffer.
5445 ;; Set point accordingly.
5450 "Move point to the end of the buffer in the other window.
5451 Leave mark at previous position.
5452 With arg N, put point N/10 of the way from the true end."
5454 ;; See beginning-of-buffer-other-window for comments.
5464 \f
5475 "When non-nil, special state of delayed window autoselection.
5476 Possible values are `suspend' \(suspend autoselection after a menu or
5477 scrollbar interaction\) and `select' \(the next invocation of
5481 "Cancel delayed window autoselection.
5482 Optional argument FORCE means cancel unconditionally."
5484 ;; Don't cancel for select-window or select-frame events
5485 ;; or when the user drags a scroll bar.
5497 "Start delayed window autoselection.
5498 MOUSE-POSITION is the last position where the mouse was seen as returned
5499 by `mouse-position'. Optional argument WINDOW non-nil denotes the
5500 window where the mouse was seen. Optional argument SUSPEND non-nil
5501 means suspend autoselection."
5502 ;; Record values for MOUSE-POSITION, WINDOW, and SUSPEND.
5506 ;; Install timer which runs `mouse-autoselect-window-select' after
5507 ;; `mouse-autoselect-window' seconds.
5513 "Select window with delayed window autoselection.
5514 If the mouse position has stabilized in a non-selected window, select
5515 that window. The minibuffer window is selected only if the minibuffer is
5516 active. This function is run by `mouse-autoselect-window-timer'."
5527 ;; A menu / popup dialog is active or the mouse is on the scroll-bar
5528 ;; of WINDOW, temporarily suspend delayed autoselection.
5531 ;; Delayed autoselection was temporarily suspended, reenable it.
5536 ;; If `mouse-autoselect-window' is positive, select
5537 ;; window if the window is the same as before.
5539 ;; Otherwise select window if the mouse is at the same
5540 ;; position as before. Observe that the first test after
5541 ;; starting autoselection usually fails since the value of
5542 ;; `mouse-autoselect-window-position' recorded there is the
5543 ;; position where the mouse has entered the new window and
5544 ;; not necessarily where the mouse has stopped moving.
5546 ;; The minibuffer is a candidate window if it's active.
5549 ;; Mouse position has stabilized in non-selected window: Cancel
5550 ;; delayed autoselection and try to select that window.
5552 ;; Select window where mouse appears unless the selected window is the
5553 ;; minibuffer. Use `unread-command-events' in order to execute pre-
5554 ;; and post-command hooks and trigger idle timers. To avoid delaying
5555 ;; autoselection again, set `mouse-autoselect-window-state'."
5560 unread-command-events))))
5564 ;; Mouse position has either stabilized in the selected window or at
5565 ;; `mouse-autoselect-window-position': Cancel delayed autoselection.
5568 ;; Mouse position has not stabilized yet, resume delayed
5569 ;; autoselection.
5573 "Handle select-window events."
5577 ;; Don't switch if we're currently in the minibuffer.
5578 ;; This tries to work around problems where the
5579 ;; minibuffer gets unselected unexpectedly, and where
5580 ;; you then have to move your mouse all the way down to
5581 ;; the minibuffer to select it.
5583 ;; Don't switch to minibuffer window unless it's active.
5586 ;; Don't switch when autoselection shall be delayed.
5591 ;; Cancel any delayed autoselection.
5593 ;; Start delayed autoselection from current mouse
5594 ;; position and window.
5596 ;; Executing a command cancels delayed autoselection.
5600 ;; Reset state of delayed autoselection.
5602 ;; Run `mouse-leave-buffer-hook' when autoselecting window.
5607 "Return non-nil if lines in WINDOW are specifically truncated due to its width.
5608 WINDOW defaults to the selected window.
5609 Return nil if WINDOW is not a partial-width window
5610 (regardless of the value of `truncate-lines').
5611 Otherwise, consult the value of `truncate-partial-width-windows'
5612 for the buffer shown in WINDOW."
5620 t-p-w-w))))
5621 \f
5622 ;; Some of these are in tutorial--default-keys, so update that if you
5623 ;; change these.
5636 ;;; window.el ends here