frame.el 45.9 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
;;; frame.el --- multi-frame management independent of window systems.
Eric S. Raymond's avatar
Eric S. Raymond committed
2

3
;; Copyright (C) 1993, 1994, 1996, 1997, 2000 Free Software Foundation, Inc.
Eric S. Raymond's avatar
Eric S. Raymond committed
4

Eric S. Raymond's avatar
Eric S. Raymond committed
5
;; Maintainer: FSF
Eric S. Raymond's avatar
Eric S. Raymond committed
6
;; Keywords: internal
Eric S. Raymond's avatar
Eric S. Raymond committed
7

Erik Naggum's avatar
Erik Naggum committed
8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
;; This file is part of GNU Emacs.

;; GNU Emacs 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.

;; GNU Emacs 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 GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
Jim Blandy's avatar
Jim Blandy committed
24

Eric S. Raymond's avatar
Eric S. Raymond committed
25 26
;;; Code:

Jim Blandy's avatar
Jim Blandy committed
27 28 29
(defvar frame-creation-function nil
  "Window-system dependent function to call to create a new frame.
The window system startup file should set this to its frame creation
Jim Blandy's avatar
Jim Blandy committed
30 31
function, which should take an alist of parameters as its argument.")

32 33 34
;;; The initial value given here for used to ask for a minibuffer.
;;; But that's not necessary, because the default is to have one.
;;; By not specifying it here, we let an X resource specify it.
35
(defcustom initial-frame-alist nil
36
  "*Alist of frame parameters for creating the initial X window frame.
37
You can set this in your `.emacs' file; for example,
Jim Blandy's avatar
Jim Blandy committed
38
 (setq initial-frame-alist '((top . 1) (left . 1) (width . 80) (height . 55)))
39 40 41 42
Parameters specified here supersede the values given in `default-frame-alist'.

If the value calls for a frame without a minibuffer, and you have not created
a minibuffer frame on your own, one is created according to
43
`minibuffer-frame-alist'.
44 45 46

You can specify geometry-related options for just the initial frame
by setting this variable in your `.emacs' file; however, they won't
Karl Heuer's avatar
Karl Heuer committed
47
take effect until Emacs reads `.emacs', which happens after first creating
48 49 50 51 52 53
the frame.  If you want the frame to have the proper geometry as soon
as it appears, you need to use this three-step process:
* Specify X resources to give the geometry you want.
* Set `default-frame-alist' to override these options so that they
  don't affect subsequent frames.
* Set `initial-frame-alist' in a way that matches the X resources,
54 55 56 57 58
  to override what you put in `default-frame-alist'."
  :type '(repeat (cons :format "%v"
		       (symbol :tag "Parameter")
		       (sexp :tag "Value")))
  :group 'frames)
Jim Blandy's avatar
Jim Blandy committed
59

60 61
(defcustom minibuffer-frame-alist '((width . 80) (height . 2))
  "*Alist of frame parameters for initially creating a minibuffer frame.
62
You can set this in your `.emacs' file; for example,
Jim Blandy's avatar
Jim Blandy committed
63
 (setq minibuffer-frame-alist
64
   '((top . 1) (left . 1) (width . 80) (height . 2)))
65
Parameters specified here supersede the values given in
66 67 68 69 70
`default-frame-alist', for a minibuffer frame."
  :type '(repeat (cons :format "%v"
		       (symbol :tag "Parameter")
		       (sexp :tag "Value")))
  :group 'frames)
Jim Blandy's avatar
Jim Blandy committed
71

72 73
(defcustom pop-up-frame-alist nil
  "*Alist of frame parameters used when creating pop-up frames.
Jim Blandy's avatar
Jim Blandy committed
74
Pop-up frames are used for completions, help, and the like.
Jim Blandy's avatar
Jim Blandy committed
75
This variable can be set in your init file, like this:
Jim Blandy's avatar
Jim Blandy committed
76
  (setq pop-up-frame-alist '((width . 80) (height . 20)))
77 78 79 80 81 82
These supersede the values given in `default-frame-alist',
for pop-up frames."
  :type '(repeat (cons :format "%v"
		       (symbol :tag "Parameter")
		       (sexp :tag "Value")))
  :group 'frames)
Jim Blandy's avatar
Jim Blandy committed
83

Jim Blandy's avatar
Jim Blandy committed
84
(setq pop-up-frame-function
Jim Blandy's avatar
Jim Blandy committed
85
      (function (lambda ()
86
		  (make-frame pop-up-frame-alist))))
Jim Blandy's avatar
Jim Blandy committed
87

Richard M. Stallman's avatar
Richard M. Stallman committed
88
(defcustom special-display-frame-alist
89 90 91 92 93 94 95
  '((height . 14) (width . 80) (unsplittable . t))
  "*Alist of frame parameters used when creating special frames.
Special frames are used for buffers whose names are in
`special-display-buffer-names' and for buffers whose names match
one of the regular expressions in `special-display-regexps'.
This variable can be set in your init file, like this:
  (setq special-display-frame-alist '((width . 80) (height . 20)))
Richard M. Stallman's avatar
Richard M. Stallman committed
96 97 98 99 100
These supersede the values given in `default-frame-alist'."
  :type '(repeat (cons :format "%v"
			 (symbol :tag "Parameter")
			 (sexp :tag "Value")))
  :group 'frames)
101

102
(defun special-display-popup-frame (buffer &optional args)
103 104 105 106 107 108 109
  "Display BUFFER in its own frame, reusing an existing window if any.
Return the window chosen.
Currently we do not insist on selecting the window within its frame.
If ARGS is an alist, use it as a list of frame parameter specs.
If ARGS is a list whose car is a symbol,
use (car ARGS) as a function to do the work.
Pass it BUFFER as first arg, and (cdr ARGS) gives the rest of the args."
110 111 112 113 114 115 116 117 118 119 120 121 122 123
  (if (and args (symbolp (car args)))
      (apply (car args) buffer (cdr args))
    (let ((window (get-buffer-window buffer t)))
      (if window
	  ;; If we have a window already, make it visible.
	  (let ((frame (window-frame window)))
	    (make-frame-visible frame)
	    (raise-frame frame)
	    window)
	;; If no window yet, make one in a new frame.
	(let ((frame (make-frame (append args special-display-frame-alist))))
	  (set-window-buffer (frame-selected-window frame) buffer)
	  (set-window-dedicated-p (frame-selected-window frame) t)
	  (frame-selected-window frame))))))
124

125
(defun handle-delete-frame (event)
126
  "Handle delete-frame events from the X server."
127 128 129 130 131 132 133 134 135 136 137
  (interactive "e")
  (let ((frame (posn-window (event-start event)))
	(i 0)
	(tail (frame-list)))
    (while tail
      (and (frame-visible-p (car tail))
	   (not (eq (car tail) frame))
	  (setq i (1+ i)))
      (setq tail (cdr tail)))
    (if (> i 0)
	(delete-frame frame t)
138 139
      ;; Gildea@x.org says it is ok to ask questions before terminating.
      (save-buffers-kill-emacs))))
Jim Blandy's avatar
Jim Blandy committed
140

Jim Blandy's avatar
Jim Blandy committed
141
;;;; Arrangement of frames at startup
Jim Blandy's avatar
Jim Blandy committed
142 143 144

;;; 1) Load the window system startup file from the lisp library and read the
;;; high-priority arguments (-q and the like).  The window system startup
Jim Blandy's avatar
Jim Blandy committed
145
;;; file should create any frames specified in the window system defaults.
Karl Heuer's avatar
Karl Heuer committed
146
;;;
Jim Blandy's avatar
Jim Blandy committed
147
;;; 2) If no frames have been opened, we open an initial text frame.
Jim Blandy's avatar
Jim Blandy committed
148 149
;;;
;;; 3) Once the init file is done, we apply any newly set parameters
Jim Blandy's avatar
Jim Blandy committed
150
;;; in initial-frame-alist to the frame.
Jim Blandy's avatar
Jim Blandy committed
151

Karl Heuer's avatar
Karl Heuer committed
152
;; These are now called explicitly at the proper times,
153 154 155 156
;; since that is easier to understand.
;; Actually using hooks within Emacs is bad for future maintenance. --rms.
;; (add-hook 'before-init-hook 'frame-initialize)
;; (add-hook 'window-setup-hook 'frame-notice-user-settings)
Jim Blandy's avatar
Jim Blandy committed
157

Jim Blandy's avatar
Jim Blandy committed
158 159
;;; If we create the initial frame, this is it.
(defvar frame-initial-frame nil)
Jim Blandy's avatar
Jim Blandy committed
160

161 162 163
;; Record the parameters used in frame-initialize to make the initial frame.
(defvar frame-initial-frame-alist)

164 165
(defvar frame-initial-geometry-arguments nil)

Jim Blandy's avatar
Jim Blandy committed
166
;;; startup.el calls this function before loading the user's init
Jim Blandy's avatar
Jim Blandy committed
167
;;; file - if there is no frame with a minibuffer open now, create
Jim Blandy's avatar
Jim Blandy committed
168
;;; one to display messages while loading the init file.
Jim Blandy's avatar
Jim Blandy committed
169
(defun frame-initialize ()
Eli Zaretskii's avatar
Eli Zaretskii committed
170
  "Create an initial frame if necessary."
Jim Blandy's avatar
Jim Blandy committed
171
  ;; Are we actually running under a window system at all?
172
  (if (and window-system (not noninteractive) (not (eq window-system 'pc)))
173
      (progn
174 175 176
	;; Turn on special-display processing only if there's a window system.
	(setq special-display-function 'special-display-popup-frame)

177 178 179 180 181
	;; If there is no frame with a minibuffer besides the terminal
	;; frame, then we need to create the opening frame.  Make sure
	;; it has a minibuffer, but let initial-frame-alist omit the
	;; minibuffer spec.
	(or (delq terminal-frame (minibuffer-frame-list))
182
	    (progn
183
	      (setq frame-initial-frame-alist
184
		    (append initial-frame-alist default-frame-alist nil))
185 186 187 188
	      (or (assq 'horizontal-scroll-bars frame-initial-frame-alist)
		  (setq frame-initial-frame-alist
			(cons '(horizontal-scroll-bars . t)
			      frame-initial-frame-alist)))
189 190
	      (setq default-minibuffer-frame
		    (setq frame-initial-frame
191
			  (make-frame frame-initial-frame-alist)))
192 193 194 195
	      ;; Delete any specifications for window geometry parameters
	      ;; so that we won't reapply them in frame-notice-user-settings.
	      ;; It would be wrong to reapply them then,
	      ;; because that would override explicit user resizing.
196
	      (setq initial-frame-alist
197
		    (frame-remove-geometry-params initial-frame-alist))))
Karl Heuer's avatar
Karl Heuer committed
198
	;; At this point, we know that we have a frame open, so we
Jim Blandy's avatar
Jim Blandy committed
199 200 201
	;; can delete the terminal frame.
	(delete-frame terminal-frame)
	(setq terminal-frame nil))
Karl Heuer's avatar
Karl Heuer committed
202

203 204
    ;; No, we're not running a window system.  Use make-terminal-frame if
    ;; we support that feature, otherwise arrange to cause errors.
205 206
    (or (eq window-system 'pc)
	(setq frame-creation-function
207 208
	      (if (fboundp 'tty-create-frame-with-faces)
		  'tty-create-frame-with-faces
209 210 211 212
		(function
		 (lambda (parameters)
		   (error
		    "Can't create multiple frames without a window system"))))))))
Karl Heuer's avatar
Karl Heuer committed
213

214 215 216
(defvar frame-notice-user-settings t
  "Non-nil means function `frame-notice-user-settings' wasn't run yet.")

217 218 219
;;; startup.el calls this function after loading the user's init
;;; file.  Now default-frame-alist and initial-frame-alist contain
;;; information to which we must react; do what needs to be done.
Jim Blandy's avatar
Jim Blandy committed
220
(defun frame-notice-user-settings ()
221 222
  "Act on user's init file settings of frame parameters.
React to settings of `default-frame-alist', `initial-frame-alist' there."
223
  ;; Make menu-bar-mode and default-frame-alist consistent.
224 225 226 227 228 229 230 231
  (when (boundp 'menu-bar-mode)
    (let ((default (assq 'menu-bar-lines default-frame-alist)))
      (if default
	  (setq menu-bar-mode (not (eq (cdr default) 0)))
	(setq default-frame-alist
	      (cons (cons 'menu-bar-lines (if menu-bar-mode 1 0))
		    default-frame-alist)))))
  
232 233 234
  ;; Make tool-bar-mode and default-frame-alist consistent.  Don't do
  ;; it in batch mode since that would leave a tool-bar-lines
  ;; parameter in default-frame-alist in a dumped Emacs, which is not
235
  ;; what we want.
236 237
  (when (and (boundp 'tool-bar-mode)
	     (not noninteractive))
238 239 240 241 242 243
    (let ((default (assq 'tool-bar-lines default-frame-alist)))
      (if default
	  (setq tool-bar-mode (not (eq (cdr default) 0)))
	(setq default-frame-alist
	      (cons (cons 'tool-bar-lines (if tool-bar-mode 1 0))
		    default-frame-alist)))))
244

245 246 247 248 249 250 251
  ;; Creating and deleting frames may shift the selected frame around,
  ;; and thus the current buffer.  Protect against that.  We don't
  ;; want to use save-excursion here, because that may also try to set
  ;; the buffer of the selected window, which fails when the selected
  ;; window is the minibuffer.
  (let ((old-buffer (current-buffer)))

252 253
    (when (and frame-notice-user-settings
	       (null frame-initial-frame))
254 255
      ;; This case happens when we don't have a window system, and
      ;; also for MS-DOS frames.
256 257 258 259 260 261
      (let ((parms (frame-parameters frame-initial-frame)))
	;; Don't change the frame names.
	(setq parms (delq (assq 'name parms) parms))
	;; Can't modify the minibuffer parameter, so don't try.
	(setq parms (delq (assq 'minibuffer parms) parms))
	(modify-frame-parameters nil
262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282
				 (if (null window-system)
				     (append initial-frame-alist
					     default-frame-alist
					     parms
					     nil)
				   ;; initial-frame-alist and
				   ;; default-frame-alist were already
				   ;; applied in pc-win.el.
				   parms))
	(if (null window-system) ;; MS-DOS does this differently in pc-win.el
	    (let ((newparms (frame-parameters))
		  (frame (selected-frame)))
	      (tty-handle-reverse-video frame newparms)
	      ;; If we changed the background color, we need to update
	      ;; the background-mode parameter, and maybe some faces,
	      ;; too.
	      (when (assq 'background-color newparms)
		(unless (or (assq 'background-mode initial-frame-alist)
			    (assq 'background-mode default-frame-alist))
		  (frame-set-background-mode frame))
		(face-set-after-frame-default frame))))))
283

284 285
    ;; If the initial frame is still around, apply initial-frame-alist
    ;; and default-frame-alist to it.
286 287 288 289 290
    (when (frame-live-p frame-initial-frame)

      ;; When tool-bar has been switched off, correct the frame size
      ;; by the lines added in x-create-frame for the tool-bar and
      ;; switch `tool-bar-mode' off.
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
      (when (display-graphic-p)
	(let ((tool-bar-lines (or (assq 'tool-bar-lines initial-frame-alist)
				  (assq 'tool-bar-lines default-frame-alist))))
	  (when (or (null tool-bar-lines)
		    (null (cdr tool-bar-lines))
		    (eq 0 (cdr tool-bar-lines)))
	    (let* ((char-height (frame-char-height frame-initial-frame))
		   (image-height 24)
		   (margin (cond ((and (consp tool-bar-button-margin)
				       (integerp (cdr tool-bar-button-margin))
				       (> tool-bar-button-margin 0))
				  (cdr tool-bar-button-margin))
				 ((and (integerp tool-bar-button-margin)
				       (> tool-bar-button-margin 0))
				  tool-bar-button-margin)
				 (t 0)))
		   (relief (if (and (integerp tool-bar-button-relief)
				    (> tool-bar-button-relief 0))
			       tool-bar-button-relief 3))
		   (lines (/ (+ image-height 
				(* 2 margin)
				(* 2 relief)
				(1- char-height))
			     char-height))
		   (height (frame-parameter frame-initial-frame 'height))
		   (newparms (list (cons 'height (- height lines))))
		   (initial-top (cdr (assq 'top 
					   frame-initial-geometry-arguments)))
		   (top (frame-parameter frame-initial-frame 'top)))
	      (when (and (consp initial-top) (eq '- (car initial-top)))
		(setq newparms 
		      (append newparms 
			      `((top . ,(+ top (* lines char-height))))
			      nil)))
	      (modify-frame-parameters frame-initial-frame newparms)
	      (tool-bar-mode -1)))))
327 328 329 330 331 332 333 334 335 336 337 338

      ;; The initial frame we create above always has a minibuffer.
      ;; If the user wants to remove it, or make it a minibuffer-only
      ;; frame, then we'll have to delete the current frame and make a
      ;; new one; you can't remove or add a root window to/from an
      ;; existing frame.
      ;;
      ;; NOTE: default-frame-alist was nil when we created the
      ;; existing frame.  We need to explicitly include
      ;; default-frame-alist in the parameters of the screen we
      ;; create here, so that its new value, gleaned from the user's
      ;; .emacs file, will be applied to the existing screen.
339 340 341 342 343 344 345 346 347 348 349 350 351 352
      (if (not (eq (cdr (or (assq 'minibuffer initial-frame-alist)
			    (assq 'minibuffer default-frame-alist)
			    '(minibuffer . t)))
		   t))
	  ;; Create the new frame.
	  (let (parms new)
	    ;; If the frame isn't visible yet, wait till it is.
	    ;; If the user has to position the window,
	    ;; Emacs doesn't know its real position until
	    ;; the frame is seen to be visible.
	    (while (not (cdr (assq 'visibility
				   (frame-parameters frame-initial-frame))))
	      (sleep-for 1))
	    (setq parms (frame-parameters frame-initial-frame))
353 354

       ;; Get rid of `name' unless it was specified explicitly before.
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
	    (or (assq 'name frame-initial-frame-alist)
		(setq parms (delq (assq 'name parms) parms)))

	    (setq parms (append initial-frame-alist
				default-frame-alist
				parms
				nil))

	    ;; Get rid of `reverse', because that was handled
	    ;; when we first made the frame.
	    (setq parms (cons '(reverse) (delq (assq 'reverse parms) parms)))

	    (if (assq 'height frame-initial-geometry-arguments)
		(setq parms (assq-delete-all 'height parms)))
	    (if (assq 'width frame-initial-geometry-arguments)
		(setq parms (assq-delete-all 'width parms)))
	    (if (assq 'left frame-initial-geometry-arguments)
		(setq parms (assq-delete-all 'left parms)))
	    (if (assq 'top frame-initial-geometry-arguments)
		(setq parms (assq-delete-all 'top parms)))
	    (setq new
		  (make-frame
		   ;; Use the geometry args that created the existing
		   ;; frame, rather than the parms we get for it.
		   (append frame-initial-geometry-arguments
			   '((user-size . t) (user-position . t))
			   parms)))
	    ;; The initial frame, which we are about to delete, may be
	    ;; the only frame with a minibuffer.  If it is, create a
	    ;; new one.
	    (or (delq frame-initial-frame (minibuffer-frame-list))
		(make-initial-minibuffer-frame nil))

	    ;; If the initial frame is serving as a surrogate
	    ;; minibuffer frame for any frames, we need to wean them
	    ;; onto a new frame.  The default-minibuffer-frame
	    ;; variable must be handled similarly.
	    (let ((users-of-initial
		   (filtered-frame-list
		    (function (lambda (frame)
				(and (not (eq frame frame-initial-frame))
				     (eq (window-frame
					  (minibuffer-window frame))
					 frame-initial-frame)))))))
	      (if (or users-of-initial
		      (eq default-minibuffer-frame frame-initial-frame))

		  ;; Choose an appropriate frame.  Prefer frames which
		  ;; are only minibuffers.
		  (let* ((new-surrogate
			  (car
			   (or (filtered-frame-list
				(function
				 (lambda (frame)
				   (eq (cdr (assq 'minibuffer
						  (frame-parameters frame)))
				       'only))))
			       (minibuffer-frame-list))))
			 (new-minibuffer (minibuffer-window new-surrogate)))

		    (if (eq default-minibuffer-frame frame-initial-frame)
			(setq default-minibuffer-frame new-surrogate))

		    ;; Wean the frames using frame-initial-frame as
		    ;; their minibuffer frame.
		    (mapcar
		     (function
		      (lambda (frame)
			(modify-frame-parameters
			 frame (list (cons 'minibuffer new-minibuffer)))))
		     users-of-initial))))

	   ;; Redirect events enqueued at this frame to the new frame.
	    ;; Is this a good idea?
	    (redirect-frame-focus frame-initial-frame new)

	    ;; Finally, get rid of the old frame.
	    (delete-frame frame-initial-frame t))
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

	;; Otherwise, we don't need all that rigamarole; just apply
	;; the new parameters.
	(let (newparms allparms tail)
	  (setq allparms (append initial-frame-alist
				 default-frame-alist nil))
	  (if (assq 'height frame-initial-geometry-arguments)
	      (setq allparms (assq-delete-all 'height allparms)))
	  (if (assq 'width frame-initial-geometry-arguments)
	      (setq allparms (assq-delete-all 'width allparms)))
	  (if (assq 'left frame-initial-geometry-arguments)
	      (setq allparms (assq-delete-all 'left allparms)))
	  (if (assq 'top frame-initial-geometry-arguments)
	      (setq allparms (assq-delete-all 'top allparms)))
	  (setq tail allparms)
	  ;; Find just the parms that have changed since we first
	  ;; made this frame.  Those are the ones actually set by
       ;; the init file.  For those parms whose values we already knew
	  ;; (such as those spec'd by command line options)
	  ;; it is undesirable to specify the parm again
	 ;; once the user has seen the frame and been able to alter it
	  ;; manually.
	  (while tail
	    (let (newval oldval)
	      (setq oldval (assq (car (car tail))
				 frame-initial-frame-alist))
	      (setq newval (cdr (assq (car (car tail)) allparms)))
	      (or (and oldval (eq (cdr oldval) newval))
		  (setq newparms
			(cons (cons (car (car tail)) newval) newparms))))
	    (setq tail (cdr tail)))
	  (setq newparms (nreverse newparms))
	  (modify-frame-parameters frame-initial-frame
				   newparms)
	  ;; If we changed the background color,
	  ;; we need to update the background-mode parameter
	  ;; and maybe some faces too.
	  (when (assq 'background-color newparms)
	    (unless (assq 'background-mode newparms)
	      (frame-set-background-mode frame-initial-frame))
	    (face-set-after-frame-default frame-initial-frame)))))
Jim Blandy's avatar
Jim Blandy committed
474

475 476 477 478
    ;; Restore the original buffer.
    (set-buffer old-buffer)

    ;; Make sure the initial frame can be GC'd if it is ever deleted.
479
    ;; Make sure frame-notice-user-settings does nothing if called twice.
480
    (setq frame-notice-user-settings nil)
481
    (setq frame-initial-frame nil)))
Jim Blandy's avatar
Jim Blandy committed
482

483 484 485 486 487 488
(defun make-initial-minibuffer-frame (display)
  (let ((parms (append minibuffer-frame-alist '((minibuffer . only)))))
    (if display
	(make-frame-on-display display parms)
      (make-frame parms))))

489
;;;; Creation of additional frames, and other frame miscellanea
Jim Blandy's avatar
Jim Blandy committed
490

Jim Blandy's avatar
Jim Blandy committed
491
(defun get-other-frame ()
492 493 494
  "Return some frame other than the current frame.
Create one if necessary.  Note that the minibuffer frame, if separate,
is not considered (see `next-frame')."
Jim Blandy's avatar
Jim Blandy committed
495
  (let ((s (if (equal (next-frame (selected-frame)) (selected-frame))
496
	       (make-frame)
Jim Blandy's avatar
Jim Blandy committed
497
	     (next-frame (selected-frame)))))
Jim Blandy's avatar
Jim Blandy committed
498 499
    s))

Jim Blandy's avatar
Jim Blandy committed
500 501
(defun next-multiframe-window ()
  "Select the next window, regardless of which frame it is on."
Jim Blandy's avatar
Jim Blandy committed
502 503 504 505 506
  (interactive)
  (select-window (next-window (selected-window)
			      (> (minibuffer-depth) 0)
			      t)))

Jim Blandy's avatar
Jim Blandy committed
507 508
(defun previous-multiframe-window ()
  "Select the previous window, regardless of which frame it is on."
Jim Blandy's avatar
Jim Blandy committed
509 510 511 512 513
  (interactive)
  (select-window (previous-window (selected-window)
				  (> (minibuffer-depth) 0)
				  t)))

514 515 516 517
(defun make-frame-on-display (display &optional parameters)
  "Make a frame on display DISPLAY.
The optional second argument PARAMETERS specifies additional frame parameters."
  (interactive "sMake frame on display: ")
518 519
  (or (string-match "\\`[^:]*:[0-9]+\\(\\.[0-9]+\\)?\\'" display)
      (error "Invalid display, not HOST:SERVER or HOST:SERVER.SCREEN"))
520 521
  (make-frame (cons (cons 'display display) parameters)))

522 523 524
(defun make-frame-command ()
  "Make a new frame, and select it if the terminal displays only one frame."
  (interactive)
525
  (if (and window-system (not (eq window-system 'pc)))
526 527 528
      (make-frame)
    (select-frame (make-frame))))

529 530 531 532 533 534 535
(defvar before-make-frame-hook nil
  "Functions to run before a frame is created.")

(defvar after-make-frame-functions nil
  "Functions to run after a frame is created.
The functions are run with one arg, the newly created frame.")

536
(defvar after-setting-font-hook nil
537 538
  "Functions to run after a frame's font has been changed.")

539
;; Alias, kept temporarily.
540
(defalias 'new-frame 'make-frame)
Jim Blandy's avatar
Jim Blandy committed
541

542 543 544 545
(defun make-frame (&optional parameters)
  "Return a newly created frame displaying the current buffer.
Optional argument PARAMETERS is an alist of parameters for the new frame.
Each element of PARAMETERS should have the form (NAME . VALUE), for example:
Richard M. Stallman's avatar
Richard M. Stallman committed
546

547
 (name . STRING)	The frame should be named STRING.
Jim Blandy's avatar
Jim Blandy committed
548

549 550
 (width . NUMBER)	The frame should be NUMBER characters in width.
 (height . NUMBER)	The frame should be NUMBER text lines high.
Jim Blandy's avatar
Jim Blandy committed
551

552
You cannot specify either `width' or `height', you must use neither or both.
Jim Blandy's avatar
Jim Blandy committed
553

554 555 556 557
 (minibuffer . t)	The frame should have a minibuffer.
 (minibuffer . nil)	The frame should have no minibuffer.
 (minibuffer . only)	The frame should contain only a minibuffer.
 (minibuffer . WINDOW)	The frame should use WINDOW as its minibuffer window.
Jim Blandy's avatar
Jim Blandy committed
558

559 560 561
Before the frame is created (via `frame-creation-function'), functions on the
hook `before-make-frame-hook' are run.  After the frame is created, functions
on `after-make-frame-functions' are run with one arg, the newly created frame."
Jim Blandy's avatar
Jim Blandy committed
562
  (interactive)
563 564 565 566
  (run-hooks 'before-make-frame-hook)
  (let ((frame (funcall frame-creation-function parameters)))
    (run-hook-with-args 'after-make-frame-functions frame)
    frame))
Jim Blandy's avatar
Jim Blandy committed
567

568 569
(defun filtered-frame-list (predicate)
  "Return a list of all live frames which satisfy PREDICATE."
570 571
  (let* ((frames (frame-list))
	 (list frames))
572
    (while (consp frames)
573 574
      (unless (funcall predicate (car frames))
	(setcar frames nil))
575
      (setq frames (cdr frames)))
576
    (delq nil list)))
577 578 579 580 581 582 583

(defun minibuffer-frame-list ()
  "Return a list of all frames with their own minibuffers."
  (filtered-frame-list
   (function (lambda (frame)
	       (eq frame (window-frame (minibuffer-window frame)))))))

584 585 586 587
(defun frames-on-display-list (&optional display)
  "Return a list of all frames on DISPLAY.
DISPLAY is a name of a display, a string of the form HOST:SERVER.SCREEN.
If DISPLAY is omitted or nil, it defaults to the selected frame's display."
588 589 590
  (let* ((display (or display (frame-parameter nil 'display)))
	 (func #'(lambda (frame)
		   (eq (frame-parameter frame 'display) display))))
591 592 593 594 595 596 597 598 599 600 601
    (filtered-frame-list func)))

(defun framep-on-display (&optional display)
  "Return the type of frames on DISPLAY.
DISPLAY may be a display name or a frame.  If it is a frame, its type is
returned.
If DISPLAY is omitted or nil, it defaults to the selected frame's display.
All frames on a given display are of the same type."
  (or (framep display)
      (framep (car (frames-on-display-list display)))))

602 603 604
(defun frame-remove-geometry-params (param-list)
  "Return the parameter list PARAM-LIST, but with geometry specs removed.
This deletes all bindings in PARAM-LIST for `top', `left', `width',
605
`height', `user-size' and `user-position' parameters.
606 607 608 609 610 611
Emacs uses this to avoid overriding explicit moves and resizings from
the user during startup."
  (setq param-list (cons nil param-list))
  (let ((tail param-list))
    (while (consp (cdr tail))
      (if (and (consp (car (cdr tail)))
612 613 614 615 616 617
	       (memq (car (car (cdr tail)))
		     '(height width top left user-position user-size)))
	  (progn
	    (setq frame-initial-geometry-arguments
		  (cons (car (cdr tail)) frame-initial-geometry-arguments))
	    (setcdr tail (cdr (cdr tail))))
618
	(setq tail (cdr tail)))))
619 620
  (setq frame-initial-geometry-arguments
	(nreverse frame-initial-geometry-arguments))
621 622 623
  (cdr param-list))


624 625 626
(defcustom focus-follows-mouse t
  "*Non-nil if window system changes focus when you move the mouse."
  :type 'boolean
Dan Nicolaescu's avatar
Dan Nicolaescu committed
627 628
  :group 'frames
  :version "20.3")
629

630
(defun other-frame (arg)
631
  "Select the ARG'th different visible frame, and raise it.
632 633 634 635 636 637
All frames are arranged in a cyclic order.
This command selects the frame ARG steps away in that order.
A negative ARG moves in the opposite order."
  (interactive "p")
  (let ((frame (selected-frame)))
    (while (> arg 0)
638 639 640 641
      (setq frame (next-frame frame))
      (while (not (eq (frame-visible-p frame) t))
	(setq frame (next-frame frame)))
      (setq arg (1- arg)))
642
    (while (< arg 0)
643 644 645
      (setq frame (previous-frame frame))
      (while (not (eq (frame-visible-p frame) t))
	(setq frame (previous-frame frame)))
646
      (setq arg (1+ arg)))
647
    (select-frame frame)
648
    (raise-frame frame)
649
    ;; Ensure, if possible, that frame gets input focus.
650 651 652 653 654 655 656 657
    (when (eq window-system 'w32)
      (w32-focus-frame frame))
    (cond (focus-follows-mouse
	   (unless (eq window-system 'w32)
	     (set-mouse-position (selected-frame) (1- (frame-width)) 0)))
	  (t
	   (when (eq window-system 'x)
	     (x-focus-frame frame))))))
658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675

(defun make-frame-names-alist ()
  (let* ((current-frame (selected-frame))
	 (falist
	  (cons
	   (cons (frame-parameter current-frame 'name) current-frame) nil))
	 (frame (next-frame nil t)))
    (while (not (eq frame current-frame))
      (progn
	(setq falist (cons (cons (frame-parameter frame 'name) frame) falist))
	(setq frame (next-frame frame t))))
    falist))

(defvar frame-name-history nil)
(defun select-frame-by-name (name)
  "Select the frame whose name is NAME and raise it.
If there is no frame by that name, signal an error."
  (interactive
676 677 678 679 680
   (let* ((frame-names-alist (make-frame-names-alist))
	   (default (car (car frame-names-alist)))
	   (input (completing-read
		   (format "Select Frame (default %s): " default)
		   frame-names-alist nil t nil 'frame-name-history)))
681 682 683
     (if (= (length input) 0)
	 (list default)
       (list input))))
684 685
  (let* ((frame-names-alist (make-frame-names-alist))
	 (frame (cdr (assoc name frame-names-alist))))
686 687 688 689
    (or frame
	(error "There is no frame named `%s'" name))
    (make-frame-visible frame)
    (raise-frame frame)
690 691 692 693 694 695
    (select-frame frame)
    ;; Ensure, if possible, that frame gets input focus.
    (if (eq window-system 'w32)
	(w32-focus-frame frame)
      (when focus-follows-mouse
	(set-mouse-position (selected-frame) (1- (frame-width)) 0)))))
Jim Blandy's avatar
Jim Blandy committed
696

Jim Blandy's avatar
Jim Blandy committed
697 698 699 700
;;;; Frame configurations

(defun current-frame-configuration ()
  "Return a list describing the positions and states of all frames.
701 702 703 704 705 706 707 708 709 710 711 712 713
Its car is `frame-configuration'.
Each element of the cdr is a list of the form (FRAME ALIST WINDOW-CONFIG),
where
  FRAME is a frame object,
  ALIST is an association list specifying some of FRAME's parameters, and
  WINDOW-CONFIG is a window configuration object for FRAME."
  (cons 'frame-configuration
	(mapcar (function
		 (lambda (frame)
		   (list frame
			 (frame-parameters frame)
			 (current-window-configuration frame))))
		(frame-list))))
Jim Blandy's avatar
Jim Blandy committed
714

715
(defun set-frame-configuration (configuration &optional nodelete)
Jim Blandy's avatar
Jim Blandy committed
716 717
  "Restore the frames to the state described by CONFIGURATION.
Each frame listed in CONFIGURATION has its position, size, window
718
configuration, and other parameters set as specified in CONFIGURATION.
719 720
Ordinarily, this function deletes all existing frames not
listed in CONFIGURATION.  But if optional second argument NODELETE
721
is given and non-nil, the unwanted frames are iconified instead."
722 723 724 725 726
  (or (frame-configuration-p configuration)
      (signal 'wrong-type-argument
	      (list 'frame-configuration-p configuration)))
  (let ((config-alist (cdr configuration))
	frames-to-delete)
Jim Blandy's avatar
Jim Blandy committed
727
    (mapcar (function
Jim Blandy's avatar
Jim Blandy committed
728
	     (lambda (frame)
729
	       (let ((parameters (assq frame config-alist)))
Jim Blandy's avatar
Jim Blandy committed
730 731
		 (if parameters
		     (progn
732 733
		       (modify-frame-parameters
			frame
Karl Heuer's avatar
Karl Heuer committed
734
			;; Since we can't set a frame's minibuffer status,
735 736 737 738 739
			;; we might as well omit the parameter altogether.
			(let* ((parms (nth 1 parameters))
			       (mini (assq 'minibuffer parms)))
			  (if mini (setq parms (delq mini parms)))
			  parms))
Jim Blandy's avatar
Jim Blandy committed
740
		       (set-window-configuration (nth 2 parameters)))
Jim Blandy's avatar
Jim Blandy committed
741 742
		   (setq frames-to-delete (cons frame frames-to-delete))))))
	    (frame-list))
743
    (if nodelete
744 745 746 747 748
	;; Note: making frames invisible here was tried
	;; but led to some strange behavior--each time the frame
	;; was made visible again, the window manager asked afresh
	;; for where to put it.
	(mapcar 'iconify-frame frames-to-delete)
749
      (mapcar 'delete-frame frames-to-delete))))
Jim Blandy's avatar
Jim Blandy committed
750

Jim Blandy's avatar
Jim Blandy committed
751 752
;;;; Convenience functions for accessing and interactively changing
;;;; frame parameters.
Jim Blandy's avatar
Jim Blandy committed
753

Jim Blandy's avatar
Jim Blandy committed
754
(defun frame-height (&optional frame)
Jim Blandy's avatar
Jim Blandy committed
755 756
  "Return number of lines available for display on FRAME.
If FRAME is omitted, describe the currently selected frame."
Jim Blandy's avatar
Jim Blandy committed
757
  (cdr (assq 'height (frame-parameters frame))))
Jim Blandy's avatar
Jim Blandy committed
758 759 760 761

(defun frame-width (&optional frame)
  "Return number of columns available for display on FRAME.
If FRAME is omitted, describe the currently selected frame."
Jim Blandy's avatar
Jim Blandy committed
762
  (cdr (assq 'width (frame-parameters frame))))
Jim Blandy's avatar
Jim Blandy committed
763

764 765
(defalias 'set-default-font 'set-frame-font)
(defun set-frame-font (font-name)
766
  "Set the font of the selected frame to FONT-NAME.
Richard M. Stallman's avatar
Richard M. Stallman committed
767 768
When called interactively, prompt for the name of the font to use.
To get the frame's current default font, use `frame-parameters'."
769 770 771 772 773 774 775 776
  (interactive 
   (list
    (let ((completion-ignore-case t))
      (completing-read "Font name: "
		       (mapcar #'list
			       ;; x-list-fonts will fail with an error
			       ;; if this frame doesn't support fonts.
			       (x-list-fonts "*" nil (selected-frame)))))))
Jim Blandy's avatar
Jim Blandy committed
777
  (modify-frame-parameters (selected-frame)
778
			   (list (cons 'font font-name)))
779
  (run-hooks 'after-setting-font-hook 'after-setting-font-hooks))
Jim Blandy's avatar
Jim Blandy committed
780

781
(defun set-background-color (color-name)
782
  "Set the background color of the selected frame to COLOR-NAME.
Richard M. Stallman's avatar
Richard M. Stallman committed
783 784
When called interactively, prompt for the name of the color to use.
To get the frame's current background color, use `frame-parameters'."
785
  (interactive (list (facemenu-read-color)))
Jim Blandy's avatar
Jim Blandy committed
786
  (modify-frame-parameters (selected-frame)
787
			   (list (cons 'background-color color-name))))
Jim Blandy's avatar
Jim Blandy committed
788

789
(defun set-foreground-color (color-name)
790
  "Set the foreground color of the selected frame to COLOR-NAME.
Richard M. Stallman's avatar
Richard M. Stallman committed
791 792
When called interactively, prompt for the name of the color to use.
To get the frame's current foreground color, use `frame-parameters'."
793
  (interactive (list (facemenu-read-color)))
Jim Blandy's avatar
Jim Blandy committed
794
  (modify-frame-parameters (selected-frame)
795
			   (list (cons 'foreground-color color-name))))
Jim Blandy's avatar
Jim Blandy committed
796 797

(defun set-cursor-color (color-name)
798
  "Set the text cursor color of the selected frame to COLOR-NAME.
Richard M. Stallman's avatar
Richard M. Stallman committed
799 800
When called interactively, prompt for the name of the color to use.
To get the frame's current cursor color, use `frame-parameters'."
801
  (interactive (list (facemenu-read-color)))
Jim Blandy's avatar
Jim Blandy committed
802
  (modify-frame-parameters (selected-frame)
803
			   (list (cons 'cursor-color color-name))))
Jim Blandy's avatar
Jim Blandy committed
804

805
(defun set-mouse-color (color-name)
806
  "Set the color of the mouse pointer of the selected frame to COLOR-NAME.
Richard M. Stallman's avatar
Richard M. Stallman committed
807 808
When called interactively, prompt for the name of the color to use.
To get the frame's current mouse color, use `frame-parameters'."
809
  (interactive (list (facemenu-read-color)))
Jim Blandy's avatar
Jim Blandy committed
810
  (modify-frame-parameters (selected-frame)
811 812 813 814
			   (list (cons 'mouse-color
				       (or color-name
					   (cdr (assq 'mouse-color
						      (frame-parameters))))))))
815

816
(defun set-border-color (color-name)
817
  "Set the color of the border of the selected frame to COLOR-NAME.
Richard M. Stallman's avatar
Richard M. Stallman committed
818 819
When called interactively, prompt for the name of the color to use.
To get the frame's current border color, use `frame-parameters'."
820
  (interactive (list (facemenu-read-color)))
821 822 823 824
  (modify-frame-parameters (selected-frame)
			   (list (cons 'border-color color-name))))

(defun auto-raise-mode (arg)
825
  "Toggle whether or not the selected frame should auto-raise.
826 827 828 829 830
With arg, turn auto-raise mode on if and only if arg is positive.
Note that this controls Emacs's own auto-raise feature.
Some window managers allow you to enable auto-raise for certain windows.
You can use that for Emacs windows if you wish, but if you do,
that is beyond the control of Emacs and this command has no effect on it."
831 832 833 834 835
  (interactive "P")
  (if (null arg)
      (setq arg
	    (if (cdr (assq 'auto-raise (frame-parameters (selected-frame))))
		-1 1)))
836 837
  (if (> arg 0)
      (raise-frame (selected-frame)))
Jim Blandy's avatar
Jim Blandy committed
838
  (modify-frame-parameters (selected-frame)
839 840
			   (list (cons 'auto-raise (> arg 0)))))

841
(defun auto-lower-mode (arg)
842
  "Toggle whether or not the selected frame should auto-lower.
843 844 845 846 847
With arg, turn auto-lower mode on if and only if arg is positive.
Note that this controls Emacs's own auto-lower feature.
Some window managers allow you to enable auto-lower for certain windows.
You can use that for Emacs windows if you wish, but if you do,
that is beyond the control of Emacs and this command has no effect on it."
848 849 850 851 852
  (interactive "P")
  (if (null arg)
      (setq arg
	    (if (cdr (assq 'auto-lower (frame-parameters (selected-frame))))
		-1 1)))
Jim Blandy's avatar
Jim Blandy committed
853
  (modify-frame-parameters (selected-frame)
854
			   (list (cons 'auto-lower (> arg 0)))))
855 856 857 858 859 860 861 862
(defun set-frame-name (name)
  "Set the name of the selected frame to NAME.
When called interactively, prompt for the name of the frame.
The frame name is displayed on the modeline if the terminal displays only
one frame, otherwise the name is displayed on the frame's caption bar."
  (interactive "sFrame name: ")
  (modify-frame-parameters (selected-frame)
			   (list (cons 'name name))))
Jim Blandy's avatar
Jim Blandy committed
863

864 865 866 867 868 869 870 871 872 873 874 875 876 877
;;;; Frame/display capabilities.
(defun display-mouse-p (&optional display)
  "Return non-nil if DISPLAY has a mouse available.
DISPLAY can be a display name, a frame, or nil (meaning the selected
frame's display)."
  (let ((frame-type (framep-on-display display)))
    (cond
     ((eq frame-type 'pc)
      (msdos-mouse-p))
     ((eq system-type 'windows-nt)
      (> w32-num-mouse-buttons 0))
     ((memq frame-type '(x mac))
      t)    ;; We assume X and Mac *always* have a pointing device
     (t
878 879 880 881 882
      (or (and (featurep 'xt-mouse)
	       xterm-mouse-mode)
	  ;; t-mouse is distributed with the GPM package.  It doesn't have
	  ;; a toggle.
	  (featurep 't-mouse))))))
883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902

(defun display-popup-menus-p (&optional display)
  "Return non-nil if popup menus are supported on DISPLAY.
DISPLAY can be a display name, a frame, or nil (meaning the selected
frame's display).
Support for popup menus requires that the mouse be available."
  (and
   (let ((frame-type (framep-on-display display)))
     (memq frame-type '(x w32 pc mac)))
   (display-mouse-p display)))

(defun display-graphic-p (&optional display)
  "Return non-nil if DISPLAY is a graphic display.
Graphical displays are those which are capable of displaying several
frames and several different fonts at once.  This is true for displays
that use a window system such as X, and false for text-only terminals.
DISPLAY can be a display name, a frame, or nil (meaning the selected
frame's display)."
  (not (null (memq (framep-on-display display) '(x w32 mac)))))

903 904 905
(defalias 'display-multi-frame-p 'display-graphic-p)
(defalias 'display-multi-font-p 'display-graphic-p)

906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021
(defun display-selections-p (&optional display)
  "Return non-nil if DISPLAY supports selections.
A selection is a way to transfer text or other data between programs
via special system buffers called `selection' or `cut buffer' or
`clipboard'.
DISPLAY can be a display name, a frame, or nil (meaning the selected
frame's display)."
  (let ((frame-type (framep-on-display display)))
    (cond
     ((eq frame-type 'pc)
      ;; MS-DOG frames support selections when Emacs runs inside
      ;; the Windows' DOS Box.
      (not (null dos-windows-version)))
     ((memq frame-type '(x w32 mac))
      t)    ;; FIXME?
     (t
      nil))))

(defun display-screens (&optional display)
  "Return the number of screens associated with DISPLAY."
  (let ((frame-type (framep-on-display display)))
    (cond
     ((memq frame-type '(x w32))
      (x-display-screens display))
     (t	;; FIXME: is this correct for the Mac?
      1))))

(defun display-pixel-height (&optional display)
  "Return the height of DISPLAY's screen in pixels.
For character terminals, each character counts as a single pixel."
  (let ((frame-type (framep-on-display display)))
    (cond
     ((memq frame-type '(x w32 mac))
      (x-display-pixel-height display))
     (t
      (frame-height (if (framep display) display (selected-frame)))))))

(defun display-pixel-width (&optional display)
  "Return the width of DISPLAY's screen in pixels.
For character terminals, each character counts as a single pixel."
  (let ((frame-type (framep-on-display display)))
    (cond
     ((memq frame-type '(x w32 mac))
      (x-display-pixel-width display))
     (t
      (frame-width (if (framep display) display (selected-frame)))))))

(defun display-mm-height (&optional display)
  "Return the height of DISPLAY's screen in millimeters.
If the information is unavailable, value is nil."
  (and (memq (framep-on-display display) '(x w32 mac))
       (x-display-mm-height display)))

(defun display-mm-width (&optional display)
  "Return the width of DISPLAY's screen in millimeters.
If the information is unavailable, value is nil."
  (and (memq (framep-on-display display) '(x w32 mac))
       (x-display-mm-width display)))

(defun display-backing-store (&optional display)
  "Return the backing store capability of DISPLAY's screen.
The value may be `always', `when-mapped', `not-useful', or nil if
the question is inapplicable to a certain kind of display."
  (let ((frame-type (framep-on-display display)))
    (cond
     ((memq frame-type '(x w32 mac))
      (x-display-backing-store display))
     (t
      'not-useful))))

(defun display-save-under (&optional display)
  "Return non-nil if DISPLAY's screen supports the SaveUnder feature."
  (let ((frame-type (framep-on-display display)))
    (cond
     ((memq frame-type '(x w32 mac))
      (x-display-save-under display))
     (t
      'not-useful))))

(defun display-planes (&optional display)
  "Return the number of planes supported by DISPLAY."
  (let ((frame-type (framep-on-display display)))
    (cond
     ((memq frame-type '(x w32 mac))
      (x-display-planes display))
     ((eq frame-type 'pc)
      4)
     (t
      (truncate (log (length (tty-color-alist)) 2))))))

(defun display-color-cells (&optional display)
  "Return the number of color cells supported by DISPLAY."
  (let ((frame-type (framep-on-display display)))
    (cond
     ((memq frame-type '(x w32 mac))
      (x-display-color-cells display))
     ((eq frame-type 'pc)
      16)
     (t
      (length (tty-color-alist))))))

(defun display-visual-class (&optional display)
  "Returns the visual class of DISPLAY.
The value is one of the symbols `static-gray', `gray-scale',
`static-color', `pseudo-color', `true-color', or `direct-color'."
  (let ((frame-type (framep-on-display display)))
    (cond
     ((memq frame-type '(x w32 mac))
      (x-display-visual-class display))
     ((and (memq frame-type '(pc t))
	   (tty-display-color-p display))
      'static-color)
     (t
      'static-gray))))


Jim Blandy's avatar
Jim Blandy committed
1022
;;;; Aliases for backward compatibility with Emacs 18.
1023 1024
(defalias 'screen-height 'frame-height)
(defalias 'screen-width 'frame-width)
Jim Blandy's avatar
Jim Blandy committed
1025 1026

(defun set-screen-width (cols &optional pretend)
1027 1028 1029 1030
  "Obsolete function to change the size of the screen to COLS columns.
Optional second arg non-nil means that redisplay should use COLS columns
but that the idea of the actual width of the frame should not be changed.
This function is provided only for compatibility with Emacs 18; new code
Christopher Zaborsky's avatar
Christopher Zaborsky committed
1031
should use `set-frame-width instead'."
Jim Blandy's avatar
Jim Blandy committed
1032 1033 1034
  (set-frame-width (selected-frame) cols pretend))

(defun set-screen-height (lines &optional pretend)
1035 1036 1037 1038
  "Obsolete function to change the height of the screen to LINES lines.
Optional second arg non-nil means that redisplay should use LINES lines
but that the idea of the actual height of the screen should not be changed.
This function is provided only for compatibility with Emacs 18; new code
1039
should use `set-frame-height' instead."
Jim Blandy's avatar
Jim Blandy committed
1040 1041
  (set-frame-height (selected-frame) lines pretend))

1042 1043 1044 1045 1046 1047 1048 1049 1050
(defun delete-other-frames (&optional frame)
  "Delete all frames except FRAME.
FRAME nil or omitted means delete all frames except the selected frame."
  (interactive)
  (unless frame
    (setq frame (selected-frame)))
  (mapcar 'delete-frame (delq frame (frame-list))))


1051 1052 1053 1054
(make-obsolete 'screen-height 'frame-height) ;before 19.15
(make-obsolete 'screen-width  'frame-width) ;before 19.15
(make-obsolete 'set-screen-width 'set-frame-width) ;before 19.15
(make-obsolete 'set-screen-height 'set-frame-height) ;before 19.15
Jim Blandy's avatar
Jim Blandy committed
1055

1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068

;;; Highlighting trailing whitespace.

(make-variable-buffer-local 'show-trailing-whitespace)

(defcustom show-trailing-whitespace nil
  "*Non-nil means highlight trailing whitespace in face `trailing-whitespace'."
  :tag "Highlight trailing whitespace."
  :set #'(lambda (symbol value) (set-default symbol value))
  :type 'boolean
  :group 'font-lock)


Gerd Moellmann's avatar
Gerd Moellmann committed
1069 1070 1071 1072 1073 1074 1075 1076 1077 1078

;;; Scrolling

(defgroup scrolling nil
  "Scrolling windows."
  :version "21.1"
  :group 'frames)

(defcustom automatic-hscrolling t
  "*Allow or disallow autmatic scrolling windows horizontally.
Stefan Monnier's avatar
Stefan Monnier committed
1079
If non-nil, windows are automatically scrolled horizontally to make
Gerd Moellmann's avatar
Gerd Moellmann committed
1080 1081 1082 1083 1084
point visible."
  :version "21.1"
  :type 'boolean
  :group 'scrolling)

1085 1086 1087 1088

;;; Blinking cursor

(defgroup cursor nil
Gerd Moellmann's avatar
Gerd Moellmann committed
1089
  "Displaying text cursors."
1090
  :version "21.1"
1091 1092 1093
  :group 'frames)

(defcustom blink-cursor-delay 0.5
Gerd Moellmann's avatar
Gerd Moellmann committed
1094
  "*Seconds of idle time after which cursor starts to blink."
1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105
  :tag "Delay in seconds."
  :type 'number
  :group 'cursor)

(defcustom blink-cursor-interval 0.5
  "*Length of cursor blink interval in seconds."
  :tag "Blink interval in seconds."
  :type 'number
  :group 'cursor)

(defvar blink-cursor-idle-timer nil
Gerd Moellmann's avatar
Gerd Moellmann committed
1106 1107
  "Timer started after `blink-cursor-delay' seconds of Emacs idle time.
The function `blink-cursor-start' is called when the timer fires.")
1108 1109

(defvar blink-cursor-timer nil
Gerd Moellmann's avatar
Gerd Moellmann committed
1110 1111
  "Timer started from `blink-cursor-start'.
This timer calls `blink-cursor' every `blink-cursor-interval' seconds.")
1112 1113 1114 1115 1116 1117

(defvar blink-cursor-mode nil
  "Non-nil means blinking cursor is active.")

(defun blink-cursor-mode (arg)
  "Toggle blinking cursor mode.
Gerd Moellmann's avatar
Gerd Moellmann committed
1118
With a numeric argument, turn blinking cursor mode on iff ARG is positive.