1 ;;; window.el --- XEmacs window commands aside from those written in C.
3 ;; Copyright (C) 1985, 1989, 1993-94, 1997 Free Software Foundation, Inc.
4 ;; Copyright (C) 1995, 1996 Ben Wing.
6 ;; Maintainer: XEmacs Development Team
7 ;; Keywords: frames, extensions, dumped
9 ;; This file is part of XEmacs.
11 ;; XEmacs is free software; you can redistribute it and/or modify it
12 ;; under the terms of the GNU General Public License as published by
13 ;; the Free Software Foundation; either version 2, or (at your option)
16 ;; XEmacs is distributed in the hope that it will be useful, but
17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 ;; General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with XEmacs; see the file COPYING. If not, write to the
23 ;; Free Software Foundation, 59 Temple Place - Suite 330,
24 ;; Boston, MA 02111-1307, USA.
26 ;;; Synched up with: Emacs/Mule zeta.
30 ;; This file is dumped with XEmacs.
34 ;;;; Window tree functions.
36 (defun one-window-p (&optional nomini all-frames device)
37 "Return non-nil if the selected window is the only window (in its frame).
38 Optional arg NOMINI non-nil means don't count the minibuffer
41 The optional arg ALL-FRAMES t means count windows on all frames.
42 If it is `visible', count windows on all visible frames.
43 ALL-FRAMES nil or omitted means count only the selected frame,
44 plus the minibuffer it uses (which may be on another frame).
45 ALL-FRAMES = 0 means count windows on all visible and iconified frames.
46 If ALL-FRAMES is any other value, count only the selected frame.
48 If optional third argument DEVICE is nil or omitted, count frames
50 If a device, count frames only on that device.
51 If a device type, count frames only on devices of that type.
52 Otherwise, count frames only on the selected device."
53 (let ((base-window (selected-window)))
54 (if (and nomini (eq base-window (minibuffer-window)))
55 (setq base-window (next-window base-window)))
57 (next-window base-window (if nomini 'arg) all-frames device))))
59 (defun walk-windows (proc &optional minibuf all-frames device)
60 "Cycle through all visible windows, calling PROC for each one.
61 PROC is called with a window as argument.
63 Optional second arg MINIBUF t means count the minibuffer window even
64 if not active. MINIBUF nil or omitted means count the minibuffer iff
65 it is active. MINIBUF neither t nor nil means not to count the
66 minibuffer even if it is active.
68 Several frames may share a single minibuffer; if the minibuffer
69 counts, all windows on all frames that share that minibuffer count
70 too. Therefore, when a separate minibuffer frame is active,
71 `walk-windows' includes the windows in the frame from which you
72 entered the minibuffer, as well as the minibuffer window. But if the
73 minibuffer does not count, only windows from WINDOW's frame count.
75 ALL-FRAMES is the optional third argument.
76 ALL-FRAMES nil or omitted means cycle within the frames as specified above.
77 ALL-FRAMES = `visible' means include windows on all visible frames.
78 ALL-FRAMES = 0 means include windows on all visible and iconified frames.
79 ALL-FRAMES = t means include windows on all frames including invisible frames.
80 Anything else means restrict to WINDOW's frame.
82 If optional fourth argument DEVICE is nil or omitted, include frames
84 If a device, include frames only on that device.
85 If a device type, include frames only on devices of that type.
86 Otherwise, include frames only on the selected device."
87 ;; If we start from the minibuffer window, don't fail to come back to it.
88 (if (window-minibuffer-p (selected-window))
90 ;; Note that, like next-window & previous-window, this behaves a little
91 ;; strangely if the selected window is on an invisible frame: it hits
92 ;; some of the windows on that frame, and all windows on visible frames.
93 (let* ((walk-windows-start (selected-window))
94 (walk-windows-current walk-windows-start))
96 (setq walk-windows-current
97 (next-window walk-windows-current minibuf all-frames
99 (funcall proc walk-windows-current)
100 (not (eq walk-windows-current walk-windows-start))))))
101 ;; The old XEmacs definition of the above clause. It's more correct in
102 ;; that it will never hit a window that's already been hit even if you
103 ;; do something odd like `delete-other-windows', but has the problem
104 ;; that it conses. (This may be called repeatedly, from lazy-lock
106 ; (let* ((walk-windows-history nil)
107 ; (walk-windows-current (selected-window)))
109 ; (setq walk-windows-current
110 ; (next-window walk-windows-current minibuf all-frames
112 ; (not (memq walk-windows-current walk-windows-history)))
113 ; (setq walk-windows-history (cons walk-windows-current
114 ; walk-windows-history))
115 ; (funcall proc walk-windows-current))))
117 (defun minibuffer-window-active-p (window)
118 "Return t if WINDOW (a minibuffer window) is now active."
119 (eq window (active-minibuffer-window)))
121 (defmacro save-selected-window (&rest body)
122 "Execute BODY, then select the window that was selected before BODY."
124 '((save-selected-window-window (selected-window)))
125 (list 'unwind-protect
128 (list 'window-live-p 'save-selected-window-window)
129 (list 'select-window 'save-selected-window-window)))))
131 (defun count-windows (&optional minibuf)
132 "Return the number of visible windows.
133 Optional arg MINIBUF non-nil means count the minibuffer
134 even if it is inactive."
136 (walk-windows (function (lambda (w)
137 (setq count (+ count 1))))
141 (defun balance-windows ()
142 "Make all visible windows the same height (approximately)."
144 (let ((count -1) levels newsizes size)
146 ;;; Don't count the lines that are above the uppermost windows.
147 ;;; (These are the menu bar lines, if any.)
148 ;(mbl (nth 1 (window-edges (frame-first-window (selected-frame))))))
149 ;; Find all the different vpos's at which windows start,
150 ;; then count them. But ignore levels that differ by only 1.
151 (save-window-excursion
152 (let (tops (prev-top -2))
153 (walk-windows (function (lambda (w)
154 (setq tops (cons (nth 1 (window-pixel-edges w))
157 (setq tops (sort tops '<))
159 (if (> (car tops) (1+ prev-top))
160 (setq prev-top (car tops)
162 (setq levels (cons (cons (car tops) count) levels))
163 (setq tops (cdr tops)))
164 (setq count (1+ count))))
165 ;; Subdivide the frame into that many vertical levels.
166 ;FSFmacs (setq size (/ (- (frame-height) mbl) count))
167 (setq size (/ (window-pixel-height (frame-root-window)) count))
168 (walk-windows (function
171 (let ((newtop (cdr (assq (nth 1 (window-pixel-edges))
173 (newbot (or (cdr (assq
174 (+ (window-pixel-height)
175 (nth 1 (window-pixel-edges)))
179 (cons (cons w (* size (- newbot newtop)))
182 (walk-windows (function (lambda (w)
184 (let ((newsize (cdr (assq w newsizes))))
186 (/ (- newsize (window-pixel-height))
187 (face-height 'default))))))
190 ;;; I think this should be the default; I think people will prefer it--rms.
191 (defcustom split-window-keep-point t
192 "*If non-nil, split windows keeps the original point in both children.
193 This is often more convenient for editing.
194 If nil, adjust point in each of the two windows to minimize redisplay.
195 This is convenient on slow terminals, but point can move strangely."
199 (defun split-window-vertically (&optional arg)
200 "Split current window into two windows, one above the other.
201 The uppermost window gets ARG lines and the other gets the rest.
202 Negative arg means select the size of the lowermost window instead.
203 With no argument, split equally or close to it.
204 Both windows display the same buffer now current.
206 If the variable split-window-keep-point is non-nil, both new windows
207 will get the same value of point as the current window. This is often
208 more convenient for editing.
210 Otherwise, we chose window starts so as to minimize the amount of
211 redisplay; this is convenient on slow terminals. The new selected
212 window is the one that the current value of point appears in. The
213 value of point can change if the text around point is hidden by the
216 Programs should probably use split-window instead of this."
218 (let ((old-w (selected-window))
220 (size (and arg (prefix-numeric-value arg)))
223 (and size (< size 0) (setq size (+ (window-height) size)))
224 (setq new-w (split-window nil size))
225 (or split-window-keep-point
228 (set-buffer (window-buffer))
229 (goto-char (window-start))
230 (setq moved (vertical-motion (window-height)))
231 (set-window-start new-w (point))
232 (if (> (point) (window-point new-w))
233 (set-window-point new-w (point)))
234 (and (= moved (window-height))
236 (setq window-full-p t)
237 (vertical-motion -1)))
238 (setq bottom (point)))
241 (set-window-point old-w (1- bottom)))
243 (<= (window-start new-w) old-point)
245 (set-window-point new-w old-point)
246 (select-window new-w)))))
249 (defun split-window-horizontally (&optional arg)
250 "Split current window into two windows side by side.
251 This window becomes the leftmost of the two, and gets ARG columns.
252 Negative arg means select the size of the rightmost window instead.
253 No arg means split equally."
255 (let ((size (and arg (prefix-numeric-value arg))))
257 (setq size (+ (window-width) size)))
258 (split-window nil size t)))
260 (defun enlarge-window-horizontally (arg)
261 "Make current window ARG columns wider."
263 (enlarge-window arg t))
265 (defun shrink-window-horizontally (arg)
266 "Make current window ARG columns narrower."
268 (shrink-window arg t))
270 (defun shrink-window-if-larger-than-buffer (&optional window)
271 "Shrink the WINDOW to be as small as possible to display its contents.
272 Do not shrink to less than `window-min-height' lines.
273 Do nothing if the buffer contains more lines than the present window height,
274 or if some of the window's contents are scrolled out of view,
275 or if the window is not the full width of the frame,
276 or if the window is the only window of its frame."
278 (or window (setq window (selected-window)))
280 (set-buffer (window-buffer window))
284 ;; If buffer ends with a newline, ignore it when counting
285 ;; height unless point is after it.
286 (if (and (not (eobp))
287 (eq ?\n (char-after (1- (point-max)))))
289 (mini (frame-property (window-frame window) 'minibuffer))
290 (edges (window-pixel-edges (selected-window))))
291 (if (and (< 1 (let ((frame (selected-frame)))
292 (select-frame (window-frame window))
295 (select-frame frame))))
296 ;; check to make sure that the window is the full width
300 (zerop (nth 0 edges))
301 ;; The whole buffer must be visible.
302 (pos-visible-in-window-p (point-min) window)
303 ;; The frame must not be minibuffer-only.
304 (not (eq mini 'only)))
306 (save-window-excursion
307 (goto-char (point-min))
308 (while (and (window-live-p window)
309 (pos-visible-in-window-p test-pos window))
310 (shrink-window 1 nil window)
313 (shrink-window (min (1- n)
314 (- (window-height window)
315 (1+ window-min-height)))
319 (defun kill-buffer-and-window ()
320 "Kill the current buffer and delete the selected window."
322 (if (yes-or-no-p (format "Kill buffer `%s'? " (buffer-name)))
323 (let ((buffer (current-buffer)))
324 (delete-window (selected-window))
325 (kill-buffer buffer))
328 ;;; New with XEmacs 20.3
329 ;;; Suggested by Noah Friedman, and tuned by Hrvoje Niksic.
330 (defun window-list (&optional minibuf all-frames device)
331 "Return a list of existing windows.
332 If the optional argument MINIBUF is non-nil, then include minibuffer
333 windows in the result.
335 By default, only the windows in the selected frame are returned.
336 The optional argument ALL-FRAMES changes this behavior:
337 ALL-FRAMES = `visible' means include windows on all visible frames.
338 ALL-FRAMES = 0 means include windows on all visible and iconified frames.
339 ALL-FRAMES = t means include windows on all frames including invisible frames.
340 Anything else means restrict to the selected frame.
341 The optional fourth argument DEVICE further clarifies which frames to
342 search as specified by ALL-FRAMES. This value is only meaningful if
343 ALL-FRAMES is non-nil.
344 If nil or omitted, search only the selected device.
345 If a device, search frames only on that device.
346 If a device type, search frames only on devices of that type.
347 Any other non-nil value means search frames on all devices."
349 (walk-windows (lambda (win)
351 minibuf all-frames device)
355 ;;; window.el ends here