lisp/frame.el

   1 ;;; frame.el --- multi-frame management independent of window systems.
   2
   3 ;; Copyright (C) 1993, 1994, 1996, 1997 Free Software Foundation, Inc.
   4
   5 ;; Maintainer: FSF
   6 ;; Keywords: internal
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 2, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23 ;; Boston, MA 02111-1307, USA.
  24
  25 ;;; Code:
  26
  27 (defvar frame-creation-function nil
  28   "Window-system dependent function to call to create a new frame.
  29 The window system startup file should set this to its frame creation
  30 function, which should take an alist of parameters as its argument.")
  31
  32 ;;; The initial value given here for used to ask for a minibuffer.
  33 ;;; But that's not necessary, because the default is to have one.
  34 ;;; 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,
  38  (setq initial-frame-alist '((top . 1) (left . 1) (width . 80) (height . 55)))
  39 Parameters specified here supersede the values given in `default-frame-alist'.
  40
  41 If the value calls for a frame without a minibuffer, and you have not created
  42 a minibuffer frame on your own, one is created according to
  43 `minibuffer-frame-alist'.
  44
  45 You can specify geometry-related options for just the initial frame
  46 by setting this variable in your `.emacs' file; however, they won't
  47 take effect until Emacs reads `.emacs', which happens after first creating
  48 the frame.  If you want the frame to have the proper geometry as soon
  49 as it appears, you need to use this three-step process:
  50 * Specify X resources to give the geometry you want.
  51 * Set `default-frame-alist' to override these options so that they
  52   don't affect subsequent frames.
  53 * Set `initial-frame-alist' in a way that matches the X resources,
  54   to override what you put in `default-frame-alist'."
  55   :type '(repeat (cons :format "%v"
  56                        (symbol :tag "Parameter")
  57                        (sexp :tag "Value")))
  58   :group 'frames)
  59
  60 (defcustom minibuffer-frame-alist '((width . 80) (height . 2))
  61   "*Alist of frame parameters for initially creating a minibuffer frame.
  62 You can set this in your `.emacs' file; for example,
  63  (setq minibuffer-frame-alist
  64    '((top . 1) (left . 1) (width . 80) (height . 2)))
  65 Parameters specified here supersede the values given in
  66 `default-frame-alist', for a minibuffer frame."
  67   :type '(repeat (cons :format "%v"
  68                        (symbol :tag "Parameter")
  69                        (sexp :tag "Value")))
  70   :group 'frames)
  71
  72 (defcustom pop-up-frame-alist nil
  73   "*Alist of frame parameters used when creating pop-up frames.
  74 Pop-up frames are used for completions, help, and the like.
  75 This variable can be set in your init file, like this:
  76   (setq pop-up-frame-alist '((width . 80) (height . 20)))
  77 These supersede the values given in `default-frame-alist',
  78 for pop-up frames."
  79   :type '(repeat (cons :format "%v"
  80                        (symbol :tag "Parameter")
  81                        (sexp :tag "Value")))
  82   :group 'frames)
  83
  84 (setq pop-up-frame-function
  85       (function (lambda ()
  86                   (make-frame pop-up-frame-alist))))
  87
  88 (defcustom special-display-frame-alist
  89   '((height . 14) (width . 80) (unsplittable . t))
  90   "*Alist of frame parameters used when creating special frames.
  91 Special frames are used for buffers whose names are in
  92 `special-display-buffer-names' and for buffers whose names match
  93 one of the regular expressions in `special-display-regexps'.
  94 This variable can be set in your init file, like this:
  95   (setq special-display-frame-alist '((width . 80) (height . 20)))
  96 These supersede the values given in `default-frame-alist'."
  97   :type '(repeat (cons :format "%v"
  98                          (symbol :tag "Parameter")
  99                          (sexp :tag "Value")))
 100   :group 'frames)
 101
 102 (defun special-display-popup-frame (buffer &optional args)
 103   "Display BUFFER in its own frame, reusing an existing window if any.
 104 Return the window chosen.
 105 Currently we do not insist on selecting the window within its frame.
 106 If ARGS is an alist, use it as a list of frame parameter specs.
 107 If ARGS is a list whose car is a symbol,
 108 use (car ARGS) as a function to do the work.
 109 Pass it BUFFER as first arg, and (cdr ARGS) gives the rest of the args."
 110   (if (and args (symbolp (car args)))
 111       (apply (car args) buffer (cdr args))
 112     (let ((window (get-buffer-window buffer t)))
 113       (if window
 114           ;; If we have a window already, make it visible.
 115           (let ((frame (window-frame window)))
 116             (make-frame-visible frame)
 117             (raise-frame frame)
 118             window)
 119         ;; If no window yet, make one in a new frame.
 120         (let ((frame (make-frame (append args special-display-frame-alist))))
 121           (set-window-buffer (frame-selected-window frame) buffer)
 122           (set-window-dedicated-p (frame-selected-window frame) t)
 123           (frame-selected-window frame))))))
 124
 125 (defun handle-delete-frame (event)
 126   "Handle delete-frame events from the X server."
 127   (interactive "e")
 128   (let ((frame (posn-window (event-start event)))
 129         (i 0)
 130         (tail (frame-list)))
 131     (while tail
 132       (and (frame-visible-p (car tail))
 133            (not (eq (car tail) frame))
 134           (setq i (1+ i)))
 135       (setq tail (cdr tail)))
 136     (if (> i 0)
 137         (delete-frame frame t)
 138       ;; Gildea@x.org says it is ok to ask questions before terminating.
 139       (save-buffers-kill-emacs))))
 140 \f
 141 ;;;; Arrangement of frames at startup
 142
 143 ;;; 1) Load the window system startup file from the lisp library and read the
 144 ;;; high-priority arguments (-q and the like).  The window system startup
 145 ;;; file should create any frames specified in the window system defaults.
 146 ;;;
 147 ;;; 2) If no frames have been opened, we open an initial text frame.
 148 ;;;
 149 ;;; 3) Once the init file is done, we apply any newly set parameters
 150 ;;; in initial-frame-alist to the frame.
 151
 152 ;; These are now called explicitly at the proper times,
 153 ;; since that is easier to understand.
 154 ;; Actually using hooks within Emacs is bad for future maintenance. --rms.
 155 ;; (add-hook 'before-init-hook 'frame-initialize)
 156 ;; (add-hook 'window-setup-hook 'frame-notice-user-settings)
 157
 158 ;;; If we create the initial frame, this is it.
 159 (defvar frame-initial-frame nil)
 160
 161 ;; Record the parameters used in frame-initialize to make the initial frame.
 162 (defvar frame-initial-frame-alist)
 163
 164 (defvar frame-initial-geometry-arguments nil)
 165
 166 ;;; startup.el calls this function before loading the user's init
 167 ;;; file - if there is no frame with a minibuffer open now, create
 168 ;;; one to display messages while loading the init file.
 169 (defun frame-initialize ()
 170   "Create an in initial frame if necessary."
 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         ;; Turn on special-display processing only if there's a window system.
 175         (setq special-display-function 'special-display-popup-frame)
 176
 177         ;; If there is no frame with a minibuffer besides the terminal
 178         ;; frame, then we need to create the opening frame.  Make sure
 179         ;; it has a minibuffer, but let initial-frame-alist omit the
 180         ;; minibuffer spec.
 181         (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               (or (assq 'horizontal-scroll-bars frame-initial-frame-alist)
 186                   (setq frame-initial-frame-alist
 187                         (cons '(horizontal-scroll-bars . t)
 188                               frame-initial-frame-alist)))
 189               (setq default-minibuffer-frame
 190                     (setq frame-initial-frame
 191                           (make-frame frame-initial-frame-alist)))
 192               ;; Delete any specifications for window geometry parameters
 193               ;; so that we won't reapply them in frame-notice-user-settings.
 194               ;; It would be wrong to reapply them then,
 195               ;; because that would override explicit user resizing.
 196               (setq initial-frame-alist
 197                     (frame-remove-geometry-params initial-frame-alist))))
 198         ;; At this point, we know that we have a frame open, so we
 199         ;; can delete the terminal frame.
 200         (delete-frame terminal-frame)
 201         (setq terminal-frame nil))
 202
 203     ;; No, we're not running a window system.  Use make-terminal-frame if
 204     ;; we support that feature, otherwise arrange to cause errors.
 205     (or (eq window-system 'pc)
 206         (setq frame-creation-function
 207               (if (fboundp 'tty-create-frame-with-faces)
 208                   'tty-create-frame-with-faces
 209                 (function
 210                  (lambda (parameters)
 211                    (error
 212                     "Can't create multiple frames without a window system"))))))))
 213
 214 ;;; startup.el calls this function after loading the user's init
 215 ;;; file.  Now default-frame-alist and initial-frame-alist contain
 216 ;;; information to which we must react; do what needs to be done.
 217 (defun frame-notice-user-settings ()
 218   "Act on user's init file settings of frame parameters.
 219 React to settings of `default-frame-alist', `initial-frame-alist' there."
 220   ;; Make menu-bar-mode and default-frame-alist consistent.
 221   (if (boundp 'menu-bar-mode)
 222       (let ((default (assq 'menu-bar-lines default-frame-alist)))
 223         (if default
 224             (setq menu-bar-mode (not (eq (cdr default) 0)))
 225           (setq default-frame-alist
 226                 (cons (cons 'menu-bar-lines (if menu-bar-mode 1 0))
 227                       default-frame-alist)))))
 228
 229   ;; Creating and deleting frames may shift the selected frame around,
 230   ;; and thus the current buffer.  Protect against that.  We don't
 231   ;; want to use save-excursion here, because that may also try to set
 232   ;; the buffer of the selected window, which fails when the selected
 233   ;; window is the minibuffer.
 234   (let ((old-buffer (current-buffer)))
 235
 236     ;; If the initial frame is still around, apply initial-frame-alist
 237     ;; and default-frame-alist to it.
 238     (if (frame-live-p frame-initial-frame)
 239
 240         ;; The initial frame we create above always has a minibuffer.
 241         ;; If the user wants to remove it, or make it a minibuffer-only
 242         ;; frame, then we'll have to delete the current frame and make a
 243         ;; new one; you can't remove or add a root window to/from an
 244         ;; existing frame.
 245         ;;
 246         ;; NOTE: default-frame-alist was nil when we created the
 247         ;; existing frame.  We need to explicitly include
 248         ;; default-frame-alist in the parameters of the screen we
 249         ;; create here, so that its new value, gleaned from the user's
 250         ;; .emacs file, will be applied to the existing screen.
 251         (if (not (eq (cdr (or (assq 'minibuffer initial-frame-alist)
 252                               (assq 'minibuffer default-frame-alist)
 253                               '(minibuffer . t)))
 254                      t))
 255             ;; Create the new frame.
 256             (let (parms new)
 257               ;; If the frame isn't visible yet, wait till it is.
 258               ;; If the user has to position the window,
 259               ;; Emacs doesn't know its real position until
 260               ;; the frame is seen to be visible.
 261               (while (not (cdr (assq 'visibility
 262                                      (frame-parameters frame-initial-frame))))
 263                 (sleep-for 1))
 264               (setq parms (frame-parameters frame-initial-frame))
 265               ;; Get rid of `name' unless it was specified explicitly before.
 266               (or (assq 'name frame-initial-frame-alist)
 267                   (setq parms (delq (assq 'name parms) parms)))
 268               (setq parms (append initial-frame-alist
 269                                   default-frame-alist
 270                                   parms
 271                                   nil))
 272               ;; Get rid of `reverse', because that was handled
 273               ;; when we first made the frame.
 274               (setq parms (cons '(reverse) (delq (assq 'reverse parms) parms)))
 275               (if (assq 'height frame-initial-geometry-arguments)
 276                   (setq parms (assoc-delete-all 'height parms)))
 277               (if (assq 'width frame-initial-geometry-arguments)
 278                   (setq parms (assoc-delete-all 'width parms)))
 279               (if (assq 'left frame-initial-geometry-arguments)
 280                   (setq parms (assoc-delete-all 'left parms)))
 281               (if (assq 'top frame-initial-geometry-arguments)
 282                   (setq parms (assoc-delete-all 'top parms)))
 283               (setq new
 284                     (make-frame
 285                      ;; Use the geometry args that created the existing
 286                      ;; frame, rather than the parms we get for it.
 287                      (append frame-initial-geometry-arguments
 288                              '((user-size . t) (user-position . t))
 289                              parms)))
 290               ;; The initial frame, which we are about to delete, may be
 291               ;; the only frame with a minibuffer.  If it is, create a
 292               ;; new one.
 293               (or (delq frame-initial-frame (minibuffer-frame-list))
 294                   (make-initial-minibuffer-frame nil))
 295
 296               ;; If the initial frame is serving as a surrogate
 297               ;; minibuffer frame for any frames, we need to wean them
 298               ;; onto a new frame.  The default-minibuffer-frame
 299               ;; variable must be handled similarly.
 300               (let ((users-of-initial
 301                      (filtered-frame-list
 302                       (function (lambda (frame)
 303                                   (and (not (eq frame frame-initial-frame))
 304                                        (eq (window-frame
 305                                             (minibuffer-window frame))
 306                                            frame-initial-frame)))))))
 307                 (if (or users-of-initial
 308                         (eq default-minibuffer-frame frame-initial-frame))
 309
 310                     ;; Choose an appropriate frame.  Prefer frames which
 311                     ;; are only minibuffers.
 312                     (let* ((new-surrogate
 313                             (car
 314                              (or (filtered-frame-list
 315                                   (function
 316                                    (lambda (frame)
 317                                      (eq (cdr (assq 'minibuffer
 318                                                     (frame-parameters frame)))
 319                                          'only))))
 320                                  (minibuffer-frame-list))))
 321                            (new-minibuffer (minibuffer-window new-surrogate)))
 322
 323                       (if (eq default-minibuffer-frame frame-initial-frame)
 324                           (setq default-minibuffer-frame new-surrogate))
 325
 326                       ;; Wean the frames using frame-initial-frame as
 327                       ;; their minibuffer frame.
 328                       (mapcar
 329                        (function
 330                         (lambda (frame)
 331                           (modify-frame-parameters
 332                            frame (list (cons 'minibuffer new-minibuffer)))))
 333                        users-of-initial))))
 334
 335               ;; Redirect events enqueued at this frame to the new frame.
 336               ;; Is this a good idea?
 337               (redirect-frame-focus frame-initial-frame new)
 338
 339               ;; Finally, get rid of the old frame.
 340               (delete-frame frame-initial-frame t))
 341
 342           ;; Otherwise, we don't need all that rigamarole; just apply
 343           ;; the new parameters.
 344           (let (newparms allparms tail)
 345             (setq allparms (append initial-frame-alist
 346                                    default-frame-alist))
 347             (if (assq 'height frame-initial-geometry-arguments)
 348                 (setq allparms (assoc-delete-all 'height allparms)))
 349             (if (assq 'width frame-initial-geometry-arguments)
 350                 (setq allparms (assoc-delete-all 'width allparms)))
 351             (if (assq 'left frame-initial-geometry-arguments)
 352                 (setq allparms (assoc-delete-all 'left allparms)))
 353             (if (assq 'top frame-initial-geometry-arguments)
 354                 (setq allparms (assoc-delete-all 'top allparms)))
 355             (setq tail allparms)
 356             ;; Find just the parms that have changed since we first
 357             ;; made this frame.  Those are the ones actually set by
 358             ;; the init file.  For those parms whose values we already knew
 359             ;; (such as those spec'd by command line options)
 360             ;; it is undesirable to specify the parm again
 361             ;; once the user has seen the frame and been able to alter it
 362             ;; manually.
 363             (while tail
 364               (let (newval oldval)
 365                 (setq oldval (assq (car (car tail))
 366                                    frame-initial-frame-alist))
 367                 (setq newval (cdr (assq (car (car tail)) allparms)))
 368                 (or (and oldval (eq (cdr oldval) newval))
 369                     (setq newparms
 370                           (cons (cons (car (car tail)) newval) newparms))))
 371               (setq tail (cdr tail)))
 372             (setq newparms (nreverse newparms))
 373             (modify-frame-parameters frame-initial-frame
 374                                      newparms)
 375             ;; If we changed the background color,
 376             ;; we need to update the background-mode parameter
 377             ;; and maybe some faces too.
 378             (when (assq 'background-color newparms)
 379               (unless (assq 'background-mode newparms)
 380                 (frame-set-background-mode frame-initial-frame))
 381               (face-set-after-frame-default frame-initial-frame))
 382             (if (assq 'font newparms)
 383                 (frame-update-faces frame-initial-frame)))))
 384
 385     ;; Restore the original buffer.
 386     (set-buffer old-buffer)
 387
 388     ;; Make sure the initial frame can be GC'd if it is ever deleted.
 389     ;; Make sure frame-notice-user-settings does nothing if called twice.
 390     (setq frame-initial-frame nil)))
 391
 392 (defun make-initial-minibuffer-frame (display)
 393   (let ((parms (append minibuffer-frame-alist '((minibuffer . only)))))
 394     (if display
 395         (make-frame-on-display display parms)
 396       (make-frame parms))))
 397
 398 ;;;; Creation of additional frames, and other frame miscellanea
 399
 400 (defun get-other-frame ()
 401   "Return some frame other than the current frame.
 402 Create one if necessary.  Note that the minibuffer frame, if separate,
 403 is not considered (see `next-frame')."
 404   (let ((s (if (equal (next-frame (selected-frame)) (selected-frame))
 405                (make-frame)
 406              (next-frame (selected-frame)))))
 407     s))
 408
 409 (defun next-multiframe-window ()
 410   "Select the next window, regardless of which frame it is on."
 411   (interactive)
 412   (select-window (next-window (selected-window)
 413                               (> (minibuffer-depth) 0)
 414                               t)))
 415
 416 (defun previous-multiframe-window ()
 417   "Select the previous window, regardless of which frame it is on."
 418   (interactive)
 419   (select-window (previous-window (selected-window)
 420                                   (> (minibuffer-depth) 0)
 421                                   t)))
 422
 423 (defun make-frame-on-display (display &optional parameters)
 424   "Make a frame on display DISPLAY.
 425 The optional second argument PARAMETERS specifies additional frame parameters."
 426   (interactive "sMake frame on display: ")
 427   (or (string-match "\\`[^:]*:[0-9]+\\(\\.[0-9]+\\)?\\'" display)
 428       (error "Invalid display, not HOST:SERVER or HOST:SERVER.SCREEN"))
 429   (make-frame (cons (cons 'display display) parameters)))
 430
 431 (defun make-frame-command ()
 432   "Make a new frame, and select it if the terminal displays only one frame."
 433   (interactive)
 434   (if (and window-system (not (eq window-system 'pc)))
 435       (make-frame)
 436     (select-frame (make-frame))))
 437
 438 (defvar before-make-frame-hook nil
 439   "Functions to run before a frame is created.")
 440
 441 (defvar after-make-frame-functions nil
 442   "Functions to run after a frame is created.
 443 The functions are run with one arg, the newly created frame.")
 444
 445 (defvar after-setting-font-hooks nil
 446   "Functions to run after a frame's font has been changed.")
 447
 448 ;; Alias, kept temporarily.
 449 (defalias 'new-frame 'make-frame)
 450
 451 (defun make-frame (&optional parameters)
 452   "Return a newly created frame displaying the current buffer.
 453 Optional argument PARAMETERS is an alist of parameters for the new frame.
 454 Each element of PARAMETERS should have the form (NAME . VALUE), for example:
 455
 456  (name . STRING)        The frame should be named STRING.
 457
 458  (width . NUMBER)       The frame should be NUMBER characters in width.
 459  (height . NUMBER)      The frame should be NUMBER text lines high.
 460
 461 You cannot specify either `width' or `height', you must use neither or both.
 462
 463  (minibuffer . t)       The frame should have a minibuffer.
 464  (minibuffer . nil)     The frame should have no minibuffer.
 465  (minibuffer . only)    The frame should contain only a minibuffer.
 466  (minibuffer . WINDOW)  The frame should use WINDOW as its minibuffer window.
 467
 468 Before the frame is created (via `frame-creation-function'), functions on the
 469 hook `before-make-frame-hook' are run.  After the frame is created, functions
 470 on `after-make-frame-functions' are run with one arg, the newly created frame."
 471   (interactive)
 472   (run-hooks 'before-make-frame-hook)
 473   (let ((frame (funcall frame-creation-function parameters)))
 474     (run-hook-with-args 'after-make-frame-functions frame)
 475     frame))
 476
 477 (defun filtered-frame-list (predicate)
 478   "Return a list of all live frames which satisfy PREDICATE."
 479   (let ((frames (frame-list))
 480         good-frames)
 481     (while (consp frames)
 482       (if (funcall predicate (car frames))
 483           (setq good-frames (cons (car frames) good-frames)))
 484       (setq frames (cdr frames)))
 485     good-frames))
 486
 487 (defun minibuffer-frame-list ()
 488   "Return a list of all frames with their own minibuffers."
 489   (filtered-frame-list
 490    (function (lambda (frame)
 491                (eq frame (window-frame (minibuffer-window frame)))))))
 492
 493 (defun frame-remove-geometry-params (param-list)
 494   "Return the parameter list PARAM-LIST, but with geometry specs removed.
 495 This deletes all bindings in PARAM-LIST for `top', `left', `width',
 496 `height', `user-size' and `user-position' parameters.
 497 Emacs uses this to avoid overriding explicit moves and resizings from
 498 the user during startup."
 499   (setq param-list (cons nil param-list))
 500   (let ((tail param-list))
 501     (while (consp (cdr tail))
 502       (if (and (consp (car (cdr tail)))
 503                (memq (car (car (cdr tail)))
 504                      '(height width top left user-position user-size)))
 505           (progn
 506             (setq frame-initial-geometry-arguments
 507                   (cons (car (cdr tail)) frame-initial-geometry-arguments))
 508             (setcdr tail (cdr (cdr tail))))
 509         (setq tail (cdr tail)))))
 510   (setq frame-initial-geometry-arguments
 511         (nreverse frame-initial-geometry-arguments))
 512   (cdr param-list))
 513
 514
 515 (defcustom focus-follows-mouse t
 516   "*Non-nil if window system changes focus when you move the mouse."
 517   :type 'boolean
 518   :group 'frames
 519   :version "20.3")
 520
 521 (defun other-frame (arg)
 522   "Select the ARG'th different visible frame, and raise it.
 523 All frames are arranged in a cyclic order.
 524 This command selects the frame ARG steps away in that order.
 525 A negative ARG moves in the opposite order."
 526   (interactive "p")
 527   (let ((frame (selected-frame)))
 528     (while (> arg 0)
 529       (setq frame (next-frame frame))
 530       (while (not (eq (frame-visible-p frame) t))
 531         (setq frame (next-frame frame)))
 532       (setq arg (1- arg)))
 533     (while (< arg 0)
 534       (setq frame (previous-frame frame))
 535       (while (not (eq (frame-visible-p frame) t))
 536         (setq frame (previous-frame frame)))
 537       (setq arg (1+ arg)))
 538     (raise-frame frame)
 539     (select-frame frame)
 540     ;; Ensure, if possible, that frame gets input focus.
 541     (if (eq window-system 'w32)
 542         (w32-focus-frame frame)
 543       (when focus-follows-mouse
 544         (set-mouse-position (selected-frame) (1- (frame-width)) 0)))))
 545
 546 (defun make-frame-names-alist ()
 547   (let* ((current-frame (selected-frame))
 548          (falist
 549           (cons
 550            (cons (frame-parameter current-frame 'name) current-frame) nil))
 551          (frame (next-frame nil t)))
 552     (while (not (eq frame current-frame))
 553       (progn
 554         (setq falist (cons (cons (frame-parameter frame 'name) frame) falist))
 555         (setq frame (next-frame frame t))))
 556     falist))
 557
 558 (defvar frame-name-history nil)
 559 (defun select-frame-by-name (name)
 560   "Select the frame whose name is NAME and raise it.
 561 If there is no frame by that name, signal an error."
 562   (interactive
 563    (let* ((frame-names-alist (make-frame-names-alist))
 564            (default (car (car frame-names-alist)))
 565            (input (completing-read
 566                    (format "Select Frame (default %s): " default)
 567                    frame-names-alist nil t nil 'frame-name-history)))
 568      (if (= (length input) 0)
 569          (list default)
 570        (list input))))
 571   (let* ((frame-names-alist (make-frame-names-alist))
 572          (frame (cdr (assoc name frame-names-alist))))
 573     (or frame
 574         (error "There is no frame named `%s'" name))
 575     (make-frame-visible frame)
 576     (raise-frame frame)
 577     (select-frame frame)
 578     ;; Ensure, if possible, that frame gets input focus.
 579     (if (eq window-system 'w32)
 580         (w32-focus-frame frame)
 581       (when focus-follows-mouse
 582         (set-mouse-position (selected-frame) (1- (frame-width)) 0)))))
 583 \f
 584 ;;;; Frame configurations
 585
 586 (defun current-frame-configuration ()
 587   "Return a list describing the positions and states of all frames.
 588 Its car is `frame-configuration'.
 589 Each element of the cdr is a list of the form (FRAME ALIST WINDOW-CONFIG),
 590 where
 591   FRAME is a frame object,
 592   ALIST is an association list specifying some of FRAME's parameters, and
 593   WINDOW-CONFIG is a window configuration object for FRAME."
 594   (cons 'frame-configuration
 595         (mapcar (function
 596                  (lambda (frame)
 597                    (list frame
 598                          (frame-parameters frame)
 599                          (current-window-configuration frame))))
 600                 (frame-list))))
 601
 602 (defun set-frame-configuration (configuration &optional nodelete)
 603   "Restore the frames to the state described by CONFIGURATION.
 604 Each frame listed in CONFIGURATION has its position, size, window
 605 configuration, and other parameters set as specified in CONFIGURATION.
 606 Ordinarily, this function deletes all existing frames not
 607 listed in CONFIGURATION.  But if optional second argument NODELETE
 608 is given and non-nil, the unwanted frames are iconified instead."
 609   (or (frame-configuration-p configuration)
 610       (signal 'wrong-type-argument
 611               (list 'frame-configuration-p configuration)))
 612   (let ((config-alist (cdr configuration))
 613         frames-to-delete)
 614     (mapcar (function
 615              (lambda (frame)
 616                (let ((parameters (assq frame config-alist)))
 617                  (if parameters
 618                      (progn
 619                        (modify-frame-parameters
 620                         frame
 621                         ;; Since we can't set a frame's minibuffer status,
 622                         ;; we might as well omit the parameter altogether.
 623                         (let* ((parms (nth 1 parameters))
 624                                (mini (assq 'minibuffer parms)))
 625                           (if mini (setq parms (delq mini parms)))
 626                           parms))
 627                        (set-window-configuration (nth 2 parameters)))
 628                    (setq frames-to-delete (cons frame frames-to-delete))))))
 629             (frame-list))
 630     (if nodelete
 631         ;; Note: making frames invisible here was tried
 632         ;; but led to some strange behavior--each time the frame
 633         ;; was made visible again, the window manager asked afresh
 634         ;; for where to put it.
 635         (mapcar 'iconify-frame frames-to-delete)
 636       (mapcar 'delete-frame frames-to-delete))))
 637 \f
 638 ;;;; Convenience functions for accessing and interactively changing
 639 ;;;; frame parameters.
 640
 641 (defun frame-parameter (frame parameter)
 642   "Return FRAME's value for parameter PARAMETER.
 643 If FRAME is nil, describe the currently selected frame."
 644   (cdr (assq parameter (frame-parameters frame))))
 645
 646 (defun frame-height (&optional frame)
 647   "Return number of lines available for display on FRAME.
 648 If FRAME is omitted, describe the currently selected frame."
 649   (cdr (assq 'height (frame-parameters frame))))
 650
 651 (defun frame-width (&optional frame)
 652   "Return number of columns available for display on FRAME.
 653 If FRAME is omitted, describe the currently selected frame."
 654   (cdr (assq 'width (frame-parameters frame))))
 655
 656 (defalias 'set-default-font 'set-frame-font)
 657 (defun set-frame-font (font-name)
 658   "Set the font of the selected frame to FONT-NAME.
 659 When called interactively, prompt for the name of the font to use.
 660 To get the frame's current default font, use `frame-parameters'."
 661   (interactive "sFont name: ")
 662   (modify-frame-parameters (selected-frame)
 663                            (list (cons 'font font-name)))
 664   ;; Update faces that want a bold or italic version of the default font.
 665   (frame-update-faces (selected-frame))
 666   (run-hooks 'after-setting-font-hooks))
 667
 668 (defun set-background-color (color-name)
 669   "Set the background color of the selected frame to COLOR-NAME.
 670 When called interactively, prompt for the name of the color to use.
 671 To get the frame's current background color, use `frame-parameters'."
 672   (interactive (list (facemenu-read-color)))
 673   (modify-frame-parameters (selected-frame)
 674                            (list (cons 'background-color color-name)))
 675   (frame-update-face-colors (selected-frame)))
 676
 677 (defun set-foreground-color (color-name)
 678   "Set the foreground color of the selected frame to COLOR-NAME.
 679 When called interactively, prompt for the name of the color to use.
 680 To get the frame's current foreground color, use `frame-parameters'."
 681   (interactive (list (facemenu-read-color)))
 682   (modify-frame-parameters (selected-frame)
 683                            (list (cons 'foreground-color color-name)))
 684   (frame-update-face-colors (selected-frame)))
 685
 686 (defun set-cursor-color (color-name)
 687   "Set the text cursor color of the selected frame to COLOR-NAME.
 688 When called interactively, prompt for the name of the color to use.
 689 To get the frame's current cursor color, use `frame-parameters'."
 690   (interactive (list (facemenu-read-color)))
 691   (modify-frame-parameters (selected-frame)
 692                            (list (cons 'cursor-color color-name))))
 693
 694 (defun set-mouse-color (color-name)
 695   "Set the color of the mouse pointer of the selected frame to COLOR-NAME.
 696 When called interactively, prompt for the name of the color to use.
 697 To get the frame's current mouse color, use `frame-parameters'."
 698   (interactive (list (facemenu-read-color)))
 699   (modify-frame-parameters (selected-frame)
 700                            (list (cons 'mouse-color
 701                                        (or color-name
 702                                            (cdr (assq 'mouse-color
 703                                                       (frame-parameters))))))))
 704
 705 (defun set-border-color (color-name)
 706   "Set the color of the border of the selected frame to COLOR-NAME.
 707 When called interactively, prompt for the name of the color to use.
 708 To get the frame's current border color, use `frame-parameters'."
 709   (interactive (list (facemenu-read-color)))
 710   (modify-frame-parameters (selected-frame)
 711                            (list (cons 'border-color color-name))))
 712
 713 (defun auto-raise-mode (arg)
 714   "Toggle whether or not the selected frame should auto-raise.
 715 With arg, turn auto-raise mode on if and only if arg is positive.
 716 Note that this controls Emacs's own auto-raise feature.
 717 Some window managers allow you to enable auto-raise for certain windows.
 718 You can use that for Emacs windows if you wish, but if you do,
 719 that is beyond the control of Emacs and this command has no effect on it."
 720   (interactive "P")
 721   (if (null arg)
 722       (setq arg
 723             (if (cdr (assq 'auto-raise (frame-parameters (selected-frame))))
 724                 -1 1)))
 725   (if (> arg 0)
 726       (raise-frame (selected-frame)))
 727   (modify-frame-parameters (selected-frame)
 728                            (list (cons 'auto-raise (> arg 0)))))
 729
 730 (defun auto-lower-mode (arg)
 731   "Toggle whether or not the selected frame should auto-lower.
 732 With arg, turn auto-lower mode on if and only if arg is positive.
 733 Note that this controls Emacs's own auto-lower feature.
 734 Some window managers allow you to enable auto-lower for certain windows.
 735 You can use that for Emacs windows if you wish, but if you do,
 736 that is beyond the control of Emacs and this command has no effect on it."
 737   (interactive "P")
 738   (if (null arg)
 739       (setq arg
 740             (if (cdr (assq 'auto-lower (frame-parameters (selected-frame))))
 741                 -1 1)))
 742   (modify-frame-parameters (selected-frame)
 743                            (list (cons 'auto-lower (> arg 0)))))
 744 (defun set-frame-name (name)
 745   "Set the name of the selected frame to NAME.
 746 When called interactively, prompt for the name of the frame.
 747 The frame name is displayed on the modeline if the terminal displays only
 748 one frame, otherwise the name is displayed on the frame's caption bar."
 749   (interactive "sFrame name: ")
 750   (modify-frame-parameters (selected-frame)
 751                            (list (cons 'name name))))
 752 \f
 753 ;;;; Aliases for backward compatibility with Emacs 18.
 754 (defalias 'screen-height 'frame-height)
 755 (defalias 'screen-width 'frame-width)
 756
 757 (defun set-screen-width (cols &optional pretend)
 758   "Obsolete function to change the size of the screen to COLS columns.
 759 Optional second arg non-nil means that redisplay should use COLS columns
 760 but that the idea of the actual width of the frame should not be changed.
 761 This function is provided only for compatibility with Emacs 18; new code
 762 should use `set-frame-width instead'."
 763   (set-frame-width (selected-frame) cols pretend))
 764
 765 (defun set-screen-height (lines &optional pretend)
 766   "Obsolete function to change the height of the screen to LINES lines.
 767 Optional second arg non-nil means that redisplay should use LINES lines
 768 but that the idea of the actual height of the screen should not be changed.
 769 This function is provided only for compatibility with Emacs 18; new code
 770 should use `set-frame-height' instead."
 771   (set-frame-height (selected-frame) lines pretend))
 772
 773 (make-obsolete 'screen-height 'frame-height)
 774 (make-obsolete 'screen-width  'frame-width)
 775 (make-obsolete 'set-screen-width 'set-frame-width)
 776 (make-obsolete 'set-screen-height 'set-frame-height)
 777
 778 \f
 779 ;;; Highlighting trailing whitespace.
 780
 781 (make-variable-buffer-local 'show-trailing-whitespace)
 782
 783 (defcustom show-trailing-whitespace nil
 784   "*Non-nil means highlight trailing whitespace in face `trailing-whitespace'."
 785   :tag "Highlight trailing whitespace."
 786   :set #'(lambda (symbol value) (set-default symbol value))
 787   :type 'boolean
 788   :group 'font-lock)
 789
 790
 791 \f
 792 ;;; Blinking cursor
 793
 794 (defgroup cursor nil
 795   "Displaying text cursors."
 796   :version "21.1"
 797   :group 'frames)
 798
 799 (defcustom blink-cursor-delay 0.5
 800   "*Seconds of idle time after which cursor starts to blink."
 801   :tag "Delay in seconds."
 802   :type 'number
 803   :group 'cursor)
 804
 805 (defcustom blink-cursor-interval 0.5
 806   "*Length of cursor blink interval in seconds."
 807   :tag "Blink interval in seconds."
 808   :type 'number
 809   :group 'cursor)
 810
 811 (defvar blink-cursor-idle-timer nil
 812   "Timer started after `blink-cursor-delay' seconds of Emacs idle time.
 813 The function `blink-cursor-start' is called when the timer fires.")
 814
 815 (defvar blink-cursor-timer nil
 816   "Timer started from `blink-cursor-start'.
 817 This timer calls `blink-cursor' every `blink-cursor-interval' seconds.")
 818
 819 (defvar blink-cursor-mode nil
 820   "Non-nil means blinking cursor is active.")
 821
 822 (defun blink-cursor-mode (arg)
 823   "Toggle blinking cursor mode.
 824 With arg, turn blinking cursor mode on iff arg is positive.
 825 When blinking cursor mode is enabled, the cursor of the selected
 826 window blinks."
 827   (interactive "P")
 828   (let ((on-p (if (null arg)
 829                   (not blink-cursor-mode)
 830                 (> (prefix-numeric-value arg) 0))))
 831     (if blink-cursor-idle-timer
 832         (cancel-timer blink-cursor-idle-timer))
 833     (if blink-cursor-timer
 834         (cancel-timer blink-cursor-timer))
 835     (setq blink-cursor-idle-timer nil
 836           blink-cursor-timer nil
 837           blink-cursor-mode nil)
 838     (if on-p
 839         (progn
 840           ;; Hide the cursor.
 841           (internal-show-cursor 0)
 842           (setq blink-cursor-idle-timer
 843                 (run-with-idle-timer blink-cursor-delay
 844                                      blink-cursor-delay
 845                                      'blink-cursor-start))
 846           (setq blink-cursor-mode t)))))
 847
 848 (defcustom blink-cursor (not (eq system-type 'ms-dos))
 849   "*Non-nil means blinking cursor mode is active."
 850   :tag "Blinking cursor"
 851   :type 'boolean
 852   :group 'cursor
 853   :set #'(lambda (symbol value)
 854            (set-default symbol value)
 855            (blink-cursor-mode (or value 0))))
 856
 857 (defun blink-cursor-start ()
 858   "Timer function called from the timer `blink-cursor-idle-timer'.
 859 This starts the timer `blink-cursor-timer', which makes the cursor blink
 860 if appropriate.  It also arranges to cancel that timer when the next
 861 command starts, by installing a pre-command hook."
 862   (when (null blink-cursor-timer)
 863     (add-hook 'pre-command-hook 'blink-cursor-end)
 864     (setq blink-cursor-timer
 865           (run-with-timer blink-cursor-interval blink-cursor-interval
 866                           'internal-show-cursor))))
 867
 868 (defun blink-cursor-end ()
 869   "Stop cursor blinking.
 870 This is installed as a pre-command hook by `blink-cursor-start'.
 871 When run, it cancels the timer `blink-cursor-timer' and removes
 872 itself as a pre-command hook."
 873   (remove-hook 'pre-command-hook 'blink-cursor-end)
 874   (internal-show-cursor 0)
 875   (cancel-timer blink-cursor-timer)
 876   (setq blink-cursor-timer nil))
 877
 878
 879 \f
 880 ;;; Busy-cursor.
 881
 882 (defcustom busy-cursor t
 883   "*Non-nil means show a busy-cursor when running under a window system."
 884   :tag "Busy-cursor"
 885   :type 'boolean
 886   :group 'cursor
 887   :get #'(lambda (symbol) display-busy-cursor)
 888   :set #'(lambda (symbol value)
 889            (set-default symbol value)
 890            (setq display-busy-cursor value)))
 891
 892
 893 \f
 894 ;;;; Key bindings
 895
 896 (define-key ctl-x-5-map "2" 'make-frame-command)
 897 (define-key ctl-x-5-map "0" 'delete-frame)
 898 (define-key ctl-x-5-map "o" 'other-frame)
 899
 900 (provide 'frame)
 901
 902 ;;; frame.el ends here
 903 (frame-notice-user-settings):