Source

XEmacs / lisp / window-xemacs.el

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
;;; window-xemacs.el --- XEmacs window commands aside from those written in C.

;; Copyright (C) 1985, 1989, 1993-94, 1997 Free Software Foundation, Inc.
;; Copyright (C) 1995, 1996 Ben Wing.

;; Maintainer: XEmacs Development Team
;; Keywords: frames, extensions, dumped

;; This file is part of XEmacs.

;; XEmacs is free software; you can redistribute it and/or modify it
;; under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.

;; XEmacs is distributed in the hope that it will be useful, but
;; WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
;; General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with XEmacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Synched up with: Not synched.

;;; Commentary:

;; This file is dumped with XEmacs.

;; slb - 5/29/97
;; Split apart from window.el in order to keep that file better in synch
;; with Emacs.

;;; Code:

(defgroup windows nil
  "Windows within a frame."
  :group 'environment)

(defun recenter (&optional n window)
  "Center point in WINDOW and redisplay frame.  With N, put point on line N.
The desired position of point is always relative to the window.
Just C-u as prefix means put point in the center of the window.
No N (i.e., it is nil) erases the entire frame and then
redraws with point in the center of the window.
If WINDOW is nil, the selected window is used."
  (interactive "_P")
  (center-to-window-line (if (consp n) nil n) window)
  (when (null n)
    (redraw-frame (window-frame window) t)))

(defun backward-other-window (arg &optional all-frames device)
  "Select the ARG'th different window on this frame, going backwards.
This is just like calling `other-window' with the arg negated."
  (interactive "p")
  (other-window (- arg) all-frames device))

(defalias 'windows-of-buffer 'get-buffer-window-list)

(defun buffer-in-multiple-windows-p (&optional buffer)
  "Return t if BUFFER is in multiple windows.
If BUFFER is not specified, the current buffer will be used."
  (setq buffer (or buffer
		   (get-buffer buffer)
		   (get-file-buffer buffer)
		   (current-buffer)))
  (> (length (windows-of-buffer buffer)) 1))

(defun window-list (&optional frame minibuf window)
  "Return a list of windows on FRAME, beginning with WINDOW.
FRAME and WINDOW default to the selected ones.
Optional second arg MINIBUF t means count the minibuffer window
even if not active.  If MINIBUF is neither t nor nil it means
not to count the minibuffer even if it is active."
  (setq window (or window (selected-window))
	frame (or frame (selected-frame)))
  (if (not (eq (window-frame window) frame))
      (error "Window must be on frame."))
  (let ((current-frame (selected-frame))
	list)
    (unwind-protect
	(save-window-excursion
	  (select-frame frame)
	  (walk-windows
	   (function (lambda (cur-window)
		       (if (not (eq window cur-window))
			   (setq list (cons cur-window list)))))
	   minibuf)
	  (setq list (cons window list)))
      (select-frame current-frame))))

;; We used to have set-window-dedicated-p as an obsolete version
;; of set-window-buffer-dedicated, but it really makes more sense
;; this way.

(make-obsolete 'set-window-buffer-dedicated 'set-window-dedicated-p)
(defun set-window-buffer-dedicated (window buffer)
  "Make WINDOW display BUFFER and be dedicated to that buffer.
Then Emacs will not automatically change which buffer appears in WINDOW.
If BUFFER is nil, make WINDOW not be dedicated (but don't change which
buffer appears in it currently)."
  (if (bufferp buffer)
      (set-window-buffer window (get-buffer-create buffer)))
  (set-window-dedicated-p window (not (null buffer))))


;; The window-config stack is stored as a list in frame property
;; 'window-config-stack, with the most recent element at the front.
;; When you pop off an element, the popped off element gets put at the
;; front of frame property 'window-config-unpop-stack, so you can
;; retrieve it using unpop-window-configuration.

(defcustom window-config-stack-max 16
  "*Maximum size of window configuration stack.
Start discarding off end if it gets this big."
  :type 'integer
  :group 'windows)

(defun window-config-stack (&optional frame)
  (or frame (setq frame (selected-frame)))
  (let ((stack (frame-property frame 'window-config-stack)))
    (if stack
	(set-undoable-stack-max stack window-config-stack-max)
      (progn
	(setq stack (make-undoable-stack window-config-stack-max))
	(set-frame-property frame 'window-config-stack stack)))
    stack))

(defun push-window-configuration (&optional config)
  "Push the current window configuration onto the window-config stack.
If CONFIG is specified, push it instead of the current window configuration.
Each frame has its own window-config stack."
  (interactive)
  (let ((wc (or config (current-window-configuration)))
	(stack (window-config-stack)))
    (if (or (= 0 (undoable-stack-a-length stack))
	    (not (equal (undoable-stack-a-top stack) wc)))
	(undoable-stack-push stack wc))))

(defun pop-window-configuration ()
  "Pop the top window configuration off the window-config stack and set it.
Before setting the new window configuration, the current window configuration
 is pushed onto the \"unpop\" stack.
`unpop-window-configuration' undoes what this function does.
Each frame has its own window-config and \"unpop\" stack."
  (interactive)
  (let ((stack (window-config-stack))
	(wc (current-window-configuration))
	popped)
    (condition-case nil
	(progn
	  (setq popped (undoable-stack-pop stack))
	  (while (equal popped wc)
	    (setq popped (undoable-stack-pop stack)))
	  (undoable-stack-push stack wc)
	  (undoable-stack-undo stack)
	  (set-window-configuration popped)
	  popped)
      (trunc-stack-bottom
       (error "Bottom of window config stack")))))

(defun unpop-window-configuration ()
  "Undo the effect of the most recent `pop-window-configuration'.
This does exactly the inverse of what `pop-window-configuration' does:
 i.e. it pops a window configuration off of the \"unpop\" stack and
 pushes the current window configuration onto the window-config stack.
Each frame has its own window-config and \"unpop\" stack."
  (interactive)
  (let ((stack (window-config-stack))
	(wc (current-window-configuration))
	popped)
    (condition-case nil
	(progn
	  (setq popped
		(progn
		  (undoable-stack-redo stack)
		  (undoable-stack-pop stack)))
	  (while (equal popped wc)
	    (setq popped
		  (progn
		    (undoable-stack-redo stack)
		    (undoable-stack-pop stack))))
	  (undoable-stack-push stack wc)
	  (set-window-configuration popped)
	  popped)
      (trunc-stack-bottom
       (error "Top of window config stack")))))


;;;;;;;;;;;;; display-buffer, moved here from C.  Hallelujah.

(defvar display-buffer-function nil
  "If non-nil, function to call to handle `display-buffer'.
It will receive three args: the same as those to `display-buffer'.")

(defvar pre-display-buffer-function nil
  "If non-nil, function that will be called from `display-buffer'
as the first action.  It will receive three args: the same as those
to `display-buffer'.
This function may be used to select an appropriate frame for the buffer,
for example.  See also the variable `display-buffer-function', which may
be used to completely replace the `display-buffer' function.
If the return value of this function is non-nil, it should be a frame,
and that frame will be used to display the buffer.")

(defcustom pop-up-frames nil
  "*Non-nil means `display-buffer' should make a separate frame."
  :type 'boolean
  :group 'frames)

(defvar pop-up-frame-function nil
  "Function to call to handle automatic new frame creation.
It is called with no arguments and should return a newly created frame.

A typical value might be `(lambda () (new-frame pop-up-frame-alist))'
where `pop-up-frame-alist' would hold the default frame parameters.")

(defcustom special-display-buffer-names nil
  "*List of buffer names that should have their own special frames.
Displaying a buffer whose name is in this list makes a special frame for it
using `special-display-function'.

An element of the list can be a cons cell instead of just a string.
Then the car should be a buffer name, and the cdr specifies frame
parameters for creating the frame for that buffer.
More precisely, the cdr is passed as the second argument to
the function found in `special-display-function', when making that frame.
See also `special-display-regexps'."
  :type '(repeat (choice :value ""
			 (string :tag "Name")
			 (cons :menu-tag "Properties"
			       :value ("" . nil)
			       (string :tag "Name")
			       (repeat :tag "Properties"
				       (group :inline t
					      (symbol :tag "Property")
					      (sexp :tag "Value"))))))
  :group 'frames)

(defcustom special-display-regexps nil
  "*List of regexps saying which buffers should have their own special frames.
If a buffer name matches one of these regexps, it gets its own frame.
Displaying a buffer whose name is in this list makes a special frame for it
using `special-display-function'.

An element of the list can be a cons cell instead of just a string.
Then the car should be the regexp, and the cdr specifies frame
parameters for creating the frame for buffers that match.
More precisely, the cdr is passed as the second argument to
the function found in `special-display-function', when making that frame.
See also `special-display-buffer-names'."
  :type '(repeat (choice :value ""
			 regexp
			 (cons :menu-tag "Properties"
			       :value ("" . nil)
			       regexp
			       (repeat :tag "Properties"
				       (group :inline t
					      (symbol :tag "Property")
					      (sexp :tag "Value"))))))
  :group 'frames)

(defvar special-display-function nil
  "Function to call to make a new frame for a special buffer.
It is called with two arguments, the buffer and optional buffer specific
data, and should return a window displaying that buffer.
The default value makes a separate frame for the buffer,
using `special-display-frame-alist' to specify the frame parameters.

A buffer is special if its is listed in `special-display-buffer-names'
or matches a regexp in `special-display-regexps'.")

(defcustom same-window-buffer-names nil
  "*List of buffer names that should appear in the selected window.
Displaying one of these buffers using `display-buffer' or `pop-to-buffer'
switches to it in the selected window, rather than making it appear
in some other window.

An element of the list can be a cons cell instead of just a string.
Then the car must be a string, which specifies the buffer name.
This is for compatibility with `special-display-buffer-names';
the cdr of the cons cell is ignored.

See also `same-window-regexps'."
  :type '(repeat (string :tag "Name"))
  :group 'windows)

(defcustom same-window-regexps nil
  "*List of regexps saying which buffers should appear in the selected window.
If a buffer name matches one of these regexps, then displaying it
using `display-buffer' or `pop-to-buffer' switches to it
in the selected window, rather than making it appear in some other window.

An element of the list can be a cons cell instead of just a string.
Then the car must be a string, which specifies the buffer name.
This is for compatibility with `special-display-buffer-names';
the cdr of the cons cell is ignored.

See also `same-window-buffer-names'."
  :type '(repeat regexp)
  :group 'windows)

(defcustom pop-up-windows t
  "*Non-nil means display-buffer should make new windows."
  :type 'boolean
  :group 'windows)

(defcustom split-height-threshold 500
 "*display-buffer would prefer to split the largest window if this large.
If there is only one window, it is split regardless of this value."
 :type 'integer
 :group 'windows)

(defcustom split-width-threshold 500
  "*display-buffer would prefer to split the largest window if this large.
If there is only one window, it is split regardless of this value."
  :type 'integer
  :group 'windows)

;; Deiconify the frame containing the window WINDOW, then return WINDOW.

(defun display-buffer-1 (window)
  (if (frame-iconified-p (window-frame window))
      (make-frame-visible (window-frame window)))
  window)

;; Can you believe that all of this crap was formerly in C?
;; Praise Jesus that it's not there any more.

(defun display-buffer (buffer &optional not-this-window-p override-frame)
  "Make BUFFER appear in some window on the current frame, but don't select it.
BUFFER can be a buffer or a buffer name.
If BUFFER is shown already in some window in the current frame,
just uses that one, unless the window is the selected window and
NOT-THIS-WINDOW-P is non-nil (interactively, with prefix arg).

If BUFFER has a dedicated frame, display on that frame instead of
the current frame, unless OVERRIDE-FRAME is non-nil.

If OVERRIDE-FRAME is non-nil, display on that frame instead of
the current frame (or the dedicated frame).

If `pop-up-windows' is non-nil, always use the
current frame and create a new window regardless of whether the
buffer has a dedicated frame, and regardless of whether
OVERRIDE-FRAME was specified.

If `pop-up-frames' is non-nil, make a new frame if no window shows BUFFER.

Returns the window displaying BUFFER."
  (interactive "BDisplay buffer:\nP")

  (let ((wconfig (current-window-configuration))
	(result
	 ;; We just simulate a `return' in C.  This function is way ugly
	 ;; and does `returns' all over the place and there's no sense
	 ;; in trying to rewrite it to be more Lispy.
	 (catch 'done
	   (let (window old-frame target-frame explicit-frame)
	     (setq old-frame (or (last-nonminibuf-frame) (selected-frame)))
	     (setq buffer (get-buffer buffer))
	     (check-argument-type 'bufferp buffer)

	     (setq explicit-frame
		   (if pre-display-buffer-function
		       (funcall pre-display-buffer-function buffer
				not-this-window-p
				override-frame)))

	     ;; Give the user the ability to completely reimplement
	     ;; this function via the `display-buffer-function'.
	     (if display-buffer-function
		 (throw 'done
			(funcall display-buffer-function buffer
				 not-this-window-p
				 override-frame)))

	     ;; If the buffer has a dedicated frame, that takes
	     ;; precedence over the current frame, and over what the
	     ;; pre-display-buffer-function did.
	     (let ((dedi (buffer-dedicated-frame buffer)))
	       (if (frame-live-p dedi) (setq explicit-frame dedi)))

	     ;; if override-frame is supplied, that takes precedence over
	     ;; everything.  This is gonna look bad if the
	     ;; pre-display-buffer-function raised some other frame
	     ;; already.
	     (if override-frame
		 (progn
		   (check-argument-type 'frame-live-p override-frame)
		   (setq explicit-frame override-frame)))

	     (setq target-frame
		   (or explicit-frame
		       (last-nonminibuf-frame)
		       (selected-frame)))

	     ;; If we have switched frames, then set not-this-window-p
	     ;; to false.  Switching frames means that selected-window
	     ;; is no longer the same as it was on entry -- it's the
	     ;; selected-window of target_frame instead of old_frame,
	     ;; so it's a fine candidate for display.
	     (if (not (eq old-frame target-frame))
		 (setq not-this-window-p nil))

	     ;; if it's in the selected window, and that's ok, then we're done.
	     (if (and (not not-this-window-p)
		      (eq buffer (window-buffer (selected-window))))
		 (throw 'done (display-buffer-1 (selected-window))))

	     ;; See if the user has specified this buffer should appear
	     ;; in the selected window.

	     (if not-this-window-p
		 nil

	       (if (or (member (buffer-name buffer) same-window-buffer-names)
		       (assoc (buffer-name buffer) same-window-buffer-names))
		   (progn
		     (switch-to-buffer buffer)
		     (throw 'done (display-buffer-1 (selected-window)))))

	       (let ((tem same-window-regexps))
		 (while tem
		   (let ((car (car tem)))
		     (if (or
			  (and (stringp car)
			       (string-match car (buffer-name buffer)))
			  (and (consp car) (stringp (car car))
			       (string-match (car car) (buffer-name buffer))))
			 (progn
			   (switch-to-buffer buffer)
			   (throw 'done (display-buffer-1
					 (selected-window))))))
		   (setq tem (cdr tem)))))

	     ;; If pop-up-frames, look for a window showing BUFFER on
	     ;; any visible or iconified frame.  Otherwise search only
	     ;; the current frame.
	     (if (and (not explicit-frame)
		      (or pop-up-frames (not (last-nonminibuf-frame))))
		 (setq target-frame 0))

	     ;; Otherwise, find some window that it's already in, and
	     ;; return that, unless that window is the selected window
	     ;; and that isn't ok.  What a contorted mess!
	     (setq window (or (if (not explicit-frame)
				  ;; search the selected frame
				  ;; first if the user didn't
				  ;; specify an explicit frame.
				  (get-buffer-window buffer nil))
			      (get-buffer-window buffer target-frame)))
	     (if (and window
		      (or (not not-this-window-p)
			  (not (eq window (selected-window)))))
		 (throw 'done (display-buffer-1 window)))

	     ;; Certain buffer names get special handling.
	     (if special-display-function
		 (progn
		   (if (member (buffer-name buffer)
			       special-display-buffer-names)
		       (throw 'done (funcall special-display-function buffer)))

		   (let ((tem (assoc (buffer-name buffer)
				     special-display-buffer-names)))
		     (if tem
			 (throw 'done (funcall special-display-function
					       buffer (cdr tem)))))

		   (let ((tem special-display-regexps))
		     (while tem
		       (let ((car (car tem)))
			 (if (and (stringp car)
				  (string-match car (buffer-name buffer)))
			     (throw 'done
				    (funcall special-display-function buffer)))
			 (if (and (consp car)
				  (stringp (car car))
				  (string-match (car car)
						(buffer-name buffer)))
			     (throw 'done (funcall
					   special-display-function buffer
					   (cdr car)))))
		       (setq tem (cdr tem))))))

	     ;; If there are no frames open that have more than a minibuffer,
	     ;; we need to create a new frame.
	     (if (or pop-up-frames
		     (null (last-nonminibuf-frame)))
		 (progn
		   (setq window (frame-selected-window
				 (funcall pop-up-frame-function)))
		   (set-window-buffer window buffer)
		   (throw 'done (display-buffer-1 window))))

	     ;; Otherwise, make it be in some window, splitting if
	     ;; appropriate/possible.  Do not split a window if we are
	     ;; displaying the buffer in a different frame than that which
	     ;; was current when we were called.  (It is already in a
	     ;; different window by virtue of being in another frame.)
	     (if (or (and pop-up-windows (eq target-frame old-frame))
		     (eq 'only (frame-property (selected-frame) 'minibuffer))
		     ;; If the current frame is a special display frame,
		     ;; don't try to reuse its windows.
		     (window-dedicated-p (frame-root-window (selected-frame))))
		 (progn
		   (if (eq 'only (frame-property (selected-frame) 'minibuffer))
		       (setq target-frame (last-nonminibuf-frame)))

		   ;; Don't try to create a window if would get an error with
		   ;; height.
		   (if (< split-height-threshold (* 2 window-min-height))
		       (setq split-height-threshold (* 2 window-min-height)))

		   ;; Same with width.
		   (if (< split-width-threshold (* 2 window-min-width))
		       (setq split-width-threshold (* 2 window-min-width)))

		   ;; If the frame we would try to split cannot be split,
		   ;; try other frames.
		   (if (frame-property (if (null target-frame)
					   (selected-frame)
					 (last-nonminibuf-frame))
				       'unsplittable)
		       (setq window
			     ;; Try visible frames first.
			     (or (get-largest-window 'visible)
				 ;; If that didn't work, try iconified frames.
				 (get-largest-window 0)
				 (get-largest-window t)))
		     (setq window (get-largest-window target-frame)))

		   ;; If we got a tall enough full-width window that
		   ;; can be split, split it.
		   (if (and window
			    (not (frame-property (window-frame window)
						 'unsplittable))
			    (>= (window-height window) split-height-threshold)
			    (or (>= (window-width window)
				    split-width-threshold)
				(and (window-leftmost-p window)
				     (window-rightmost-p window))))
		       (setq window (split-window window))
		     (let (upper
;;			   lower
			   other)
		       (setq window (get-lru-window target-frame))
		       ;; If the LRU window is selected, and big enough,
		       ;; and can be split, split it.
		       (if (and window
				(not (frame-property (window-frame window)
						     'unsplittable))
				(or (eq window (selected-window))
				    (not (window-parent window)))
				(>= (window-height window)
				    (* 2 window-min-height)))
			   (setq window (split-window window)))
		       ;; If get-lru-window returned nil, try other approaches.
		       ;; Try visible frames first.
		       (or window
			   (setq window (or (get-largest-window 'visible)
					    ;; If that didn't work, try
					    ;; iconified frames.
					    (get-largest-window 0)
					    ;; Try invisible frames.
					    (get-largest-window t)
					    ;; As a last resort, make
					    ;; a new frame.
					    (frame-selected-window
					     (funcall
					      pop-up-frame-function)))))
		       ;; If window appears above or below another,
		       ;; even out their heights.
		       (if (window-previous-child window)
			   (setq other (window-previous-child window)
;;				 lower window
				 upper other))
		       (if (window-next-child window)
			   (setq other (window-next-child window)
;;				 lower other
				 upper window))
		       ;; Check that OTHER and WINDOW are vertically arrayed.
		       (if (and other
				(not (= (nth 1 (window-pixel-edges other))
					(nth 1 (window-pixel-edges window))))
				(> (window-pixel-height other)
				   (window-pixel-height window)))
			   (enlarge-window (- (/ (+ (window-height other)
						    (window-height window))
						 2)
					      (window-height upper))
					   nil upper)))))

	       (setq window (get-lru-window target-frame)))

	     ;; Bring the window's previous buffer to the top of the MRU chain.
	     (if (window-buffer window)
		 (save-excursion
		   (save-selected-window
		     (select-window window)
		     (record-buffer (window-buffer window)))))

	     (set-window-buffer window buffer)

	     (display-buffer-1 window)))))
    (or (equal wconfig (current-window-configuration))
	(push-window-configuration wconfig))
    result))

;;; window-xemacs.el ends here