code.delx.au - gnu-emacs/blob - lisp/frame.el

   1 ;;; frame.el --- multi-frame management independent of window systems
   2
   3 ;; Copyright (C) 1993, 1994, 1996, 1997, 2000, 2001, 2002, 2003,
   4 ;;   2004, 2005, 2006 Free Software Foundation, Inc.
   5
   6 ;; Maintainer: FSF
   7 ;; Keywords: internal
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software; you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation; either version 2, or (at your option)
  14 ;; any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  23 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  24 ;; Boston, MA 02110-1301, USA.
  25
  26 ;;; Commentary:
  27
  28 ;;; Code:
  29
  30 (defvar frame-creation-function nil
  31   "Window-system dependent function to call to create a new frame.
  32 The window system startup file should set this to its frame creation
  33 function, which should take an alist of parameters as its argument.")
  34
  35 ;; The initial value given here used to ask for a minibuffer.
  36 ;; But that's not necessary, because the default is to have one.
  37 ;; By not specifying it here, we let an X resource specify it.
  38 (defcustom initial-frame-alist nil
  39   "*Alist of frame parameters for creating the initial X window frame.
  40 You can set this in your `.emacs' file; for example,
  41  (setq initial-frame-alist '((top . 1) (left . 1) (width . 80) (height . 55)))
  42 Parameters specified here supersede the values given in `default-frame-alist'.
  43
  44 If the value calls for a frame without a minibuffer, and you have not created
  45 a minibuffer frame on your own, one is created according to
  46 `minibuffer-frame-alist'.
  47
  48 You can specify geometry-related options for just the initial frame
  49 by setting this variable in your `.emacs' file; however, they won't
  50 take effect until Emacs reads `.emacs', which happens after first creating
  51 the frame.  If you want the frame to have the proper geometry as soon
  52 as it appears, you need to use this three-step process:
  53 * Specify X resources to give the geometry you want.
  54 * Set `default-frame-alist' to override these options so that they
  55   don't affect subsequent frames.
  56 * Set `initial-frame-alist' in a way that matches the X resources,
  57   to override what you put in `default-frame-alist'."
  58   :type '(repeat (cons :format "%v"
  59                        (symbol :tag "Parameter")
  60                        (sexp :tag "Value")))
  61   :group 'frames)
  62
  63 (defcustom minibuffer-frame-alist '((width . 80) (height . 2))
  64   "*Alist of frame parameters for initially creating a minibuffer frame.
  65 You can set this in your `.emacs' file; for example,
  66  (setq minibuffer-frame-alist
  67    '((top . 1) (left . 1) (width . 80) (height . 2)))
  68 Parameters specified here supersede the values given in
  69 `default-frame-alist', for a minibuffer frame."
  70   :type '(repeat (cons :format "%v"
  71                        (symbol :tag "Parameter")
  72                        (sexp :tag "Value")))
  73   :group 'frames)
  74
  75 (defcustom pop-up-frame-alist nil
  76   "*Alist of frame parameters used when creating pop-up frames.
  77 Pop-up frames are used for completions, help, and the like.
  78 This variable can be set in your init file, like this:
  79   (setq pop-up-frame-alist '((width . 80) (height . 20)))
  80 These supersede the values given in `default-frame-alist',
  81 for pop-up frames."
  82   :type '(repeat (cons :format "%v"
  83                        (symbol :tag "Parameter")
  84                        (sexp :tag "Value")))
  85   :group 'frames)
  86
  87 (setq pop-up-frame-function
  88       ;; Using `function' here caused some sort of problem.
  89       '(lambda ()
  90          (make-frame pop-up-frame-alist)))
  91
  92 (defcustom special-display-frame-alist
  93   '((height . 14) (width . 80) (unsplittable . t))
  94   "*Alist of frame parameters used when creating special frames.
  95 Special frames are used for buffers whose names are in
  96 `special-display-buffer-names' and for buffers whose names match
  97 one of the regular expressions in `special-display-regexps'.
  98 This variable can be set in your init file, like this:
  99   (setq special-display-frame-alist '((width . 80) (height . 20)))
 100 These supersede the values given in `default-frame-alist'."
 101   :type '(repeat (cons :format "%v"
 102                          (symbol :tag "Parameter")
 103                          (sexp :tag "Value")))
 104   :group 'frames)
 105
 106 (defun special-display-popup-frame (buffer &optional args)
 107   "Display BUFFER in its own frame, reusing an existing window if any.
 108 Return the window chosen.
 109 Currently we do not insist on selecting the window within its frame.
 110 If ARGS is an alist, use it as a list of frame parameter specs.
 111 If ARGS is a list whose car is a symbol,
 112 use (car ARGS) as a function to do the work.
 113 Pass it BUFFER as first arg, and (cdr ARGS) gives the rest of the args."
 114   (if (and args (symbolp (car args)))
 115       (apply (car args) buffer (cdr args))
 116     (let ((window (get-buffer-window buffer 0)))
 117       (or
 118        ;; If we have a window already, make it visible.
 119        (when window
 120          (let ((frame (window-frame window)))
 121            (make-frame-visible frame)
 122            (raise-frame frame)
 123            window))
 124        ;; Reuse the current window if the user requested it.
 125        (when (cdr (assq 'same-window args))
 126          (condition-case nil
 127              (progn (switch-to-buffer buffer) (selected-window))
 128            (error nil)))
 129        ;; Stay on the same frame if requested.
 130        (when (or (cdr (assq 'same-frame args)) (cdr (assq 'same-window args)))
 131          (let* ((pop-up-frames nil) (pop-up-windows t)
 132                 special-display-regexps special-display-buffer-names
 133                 (window (display-buffer buffer)))
 134            ;; Only do it if this is a new window:
 135            ;; (set-window-dedicated-p window t)
 136            window))
 137        ;; If no window yet, make one in a new frame.
 138        (let ((frame
 139               (with-current-buffer buffer
 140                 (make-frame (append args special-display-frame-alist)))))
 141          (set-window-buffer (frame-selected-window frame) buffer)
 142          (set-window-dedicated-p (frame-selected-window frame) t)
 143          (frame-selected-window frame))))))
 144
 145 (defun handle-delete-frame (event)
 146   "Handle delete-frame events from the X server."
 147   (interactive "e")
 148   (let ((frame (posn-window (event-start event)))
 149         (i 0)
 150         (tail (frame-list)))
 151     (while tail
 152       (and (frame-visible-p (car tail))
 153            (not (eq (car tail) frame))
 154           (setq i (1+ i)))
 155       (setq tail (cdr tail)))
 156     (if (> i 0)
 157         (delete-frame frame t)
 158       ;; Gildea@x.org says it is ok to ask questions before terminating.
 159       (save-buffers-kill-emacs))))
 160 \f
 161 ;;;; Arrangement of frames at startup
 162
 163 ;; 1) Load the window system startup file from the lisp library and read the
 164 ;; high-priority arguments (-q and the like).  The window system startup
 165 ;; file should create any frames specified in the window system defaults.
 166 ;;
 167 ;; 2) If no frames have been opened, we open an initial text frame.
 168 ;;
 169 ;; 3) Once the init file is done, we apply any newly set parameters
 170 ;; in initial-frame-alist to the frame.
 171
 172 ;; These are now called explicitly at the proper times,
 173 ;; since that is easier to understand.
 174 ;; Actually using hooks within Emacs is bad for future maintenance. --rms.
 175 ;; (add-hook 'before-init-hook 'frame-initialize)
 176 ;; (add-hook 'window-setup-hook 'frame-notice-user-settings)
 177
 178 ;; If we create the initial frame, this is it.
 179 (defvar frame-initial-frame nil)
 180
 181 ;; Record the parameters used in frame-initialize to make the initial frame.
 182 (defvar frame-initial-frame-alist)
 183
 184 (defvar frame-initial-geometry-arguments nil)
 185
 186 ;; startup.el calls this function before loading the user's init
 187 ;; file - if there is no frame with a minibuffer open now, create
 188 ;; one to display messages while loading the init file.
 189 (defun frame-initialize ()
 190   "Create an initial frame if necessary."
 191   ;; Are we actually running under a window system at all?
 192   (if (and window-system (not noninteractive) (not (eq window-system 'pc)))
 193       (progn
 194         ;; Turn on special-display processing only if there's a window system.
 195         (setq special-display-function 'special-display-popup-frame)
 196
 197         ;; If there is no frame with a minibuffer besides the terminal
 198         ;; frame, then we need to create the opening frame.  Make sure
 199         ;; it has a minibuffer, but let initial-frame-alist omit the
 200         ;; minibuffer spec.
 201         (or (delq terminal-frame (minibuffer-frame-list))
 202             (progn
 203               (setq frame-initial-frame-alist
 204                     (append initial-frame-alist default-frame-alist nil))
 205               (or (assq 'horizontal-scroll-bars frame-initial-frame-alist)
 206                   (setq frame-initial-frame-alist
 207                         (cons '(horizontal-scroll-bars . t)
 208                               frame-initial-frame-alist)))
 209               (setq default-minibuffer-frame
 210                     (setq frame-initial-frame
 211                           (make-frame frame-initial-frame-alist)))
 212               ;; Delete any specifications for window geometry parameters
 213               ;; so that we won't reapply them in frame-notice-user-settings.
 214               ;; It would be wrong to reapply them then,
 215               ;; because that would override explicit user resizing.
 216               (setq initial-frame-alist
 217                     (frame-remove-geometry-params initial-frame-alist))))
 218         ;; At this point, we know that we have a frame open, so we
 219         ;; can delete the terminal frame.
 220         (delete-frame terminal-frame)
 221         (setq terminal-frame nil))
 222
 223     ;; No, we're not running a window system.  Use make-terminal-frame if
 224     ;; we support that feature, otherwise arrange to cause errors.
 225     (or (eq window-system 'pc)
 226         (setq frame-creation-function
 227               (if (fboundp 'tty-create-frame-with-faces)
 228                   'tty-create-frame-with-faces
 229                 (function
 230                  (lambda (parameters)
 231                    (error
 232                     "Can't create multiple frames without a window system"))))))))
 233
 234 (defvar frame-notice-user-settings t
 235   "Non-nil means function `frame-notice-user-settings' wasn't run yet.")
 236
 237 ;; startup.el calls this function after loading the user's init
 238 ;; file.  Now default-frame-alist and initial-frame-alist contain
 239 ;; information to which we must react; do what needs to be done.
 240 (defun frame-notice-user-settings ()
 241   "Act on user's init file settings of frame parameters.
 242 React to settings of `default-frame-alist', `initial-frame-alist' there."
 243   ;; Make menu-bar-mode and default-frame-alist consistent.
 244   (when (boundp 'menu-bar-mode)
 245     (let ((default (assq 'menu-bar-lines default-frame-alist)))
 246       (if default
 247           (setq menu-bar-mode (not (eq (cdr default) 0)))
 248         (setq default-frame-alist
 249               (cons (cons 'menu-bar-lines (if menu-bar-mode 1 0))
 250                     default-frame-alist)))))
 251
 252   ;; Make tool-bar-mode and default-frame-alist consistent.  Don't do
 253   ;; it in batch mode since that would leave a tool-bar-lines
 254   ;; parameter in default-frame-alist in a dumped Emacs, which is not
 255   ;; what we want.
 256   (when (and (boundp 'tool-bar-mode)
 257              (not noninteractive))
 258     (let ((default (assq 'tool-bar-lines default-frame-alist)))
 259       (if default
 260           (setq tool-bar-mode (not (eq (cdr default) 0)))
 261         (setq default-frame-alist
 262               (cons (cons 'tool-bar-lines (if tool-bar-mode 1 0))
 263                     default-frame-alist)))))
 264
 265   ;; Creating and deleting frames may shift the selected frame around,
 266   ;; and thus the current buffer.  Protect against that.  We don't
 267   ;; want to use save-excursion here, because that may also try to set
 268   ;; the buffer of the selected window, which fails when the selected
 269   ;; window is the minibuffer.
 270   (let ((old-buffer (current-buffer)))
 271
 272     (when (and frame-notice-user-settings
 273                (null frame-initial-frame))
 274       ;; This case happens when we don't have a window system, and
 275       ;; also for MS-DOS frames.
 276       (let ((parms (frame-parameters frame-initial-frame)))
 277         ;; Don't change the frame names.
 278         (setq parms (delq (assq 'name parms) parms))
 279         ;; Can't modify the minibuffer parameter, so don't try.
 280         (setq parms (delq (assq 'minibuffer parms) parms))
 281         (modify-frame-parameters nil
 282                                  (if (null window-system)
 283                                      (append initial-frame-alist
 284                                              default-frame-alist
 285                                              parms
 286                                              nil)
 287                                    ;; initial-frame-alist and
 288                                    ;; default-frame-alist were already
 289                                    ;; applied in pc-win.el.
 290                                    parms))
 291         (if (null window-system) ;; MS-DOS does this differently in pc-win.el
 292             (let ((newparms (frame-parameters))
 293                   (frame (selected-frame)))
 294               (tty-handle-reverse-video frame newparms)
 295               ;; If we changed the background color, we need to update
 296               ;; the background-mode parameter, and maybe some faces,
 297               ;; too.
 298               (when (assq 'background-color newparms)
 299                 (unless (or (assq 'background-mode initial-frame-alist)
 300                             (assq 'background-mode default-frame-alist))
 301                   (frame-set-background-mode frame))
 302                 (face-set-after-frame-default frame))))))
 303
 304     ;; If the initial frame is still around, apply initial-frame-alist
 305     ;; and default-frame-alist to it.
 306     (when (frame-live-p frame-initial-frame)
 307
 308       ;; When tool-bar has been switched off, correct the frame size
 309       ;; by the lines added in x-create-frame for the tool-bar and
 310       ;; switch `tool-bar-mode' off.
 311       (when (display-graphic-p)
 312         (let ((tool-bar-lines (or (assq 'tool-bar-lines initial-frame-alist)
 313                                   (assq 'tool-bar-lines default-frame-alist))))
 314           (when (and tool-bar-originally-present
 315                      (or (null tool-bar-lines)
 316                          (null (cdr tool-bar-lines))
 317                          (eq 0 (cdr tool-bar-lines))))
 318             (let* ((char-height (frame-char-height frame-initial-frame))
 319                    (image-height tool-bar-images-pixel-height)
 320                    (margin (cond ((and (consp tool-bar-button-margin)
 321                                        (integerp (cdr tool-bar-button-margin))
 322                                        (> tool-bar-button-margin 0))
 323                                   (cdr tool-bar-button-margin))
 324                                  ((and (integerp tool-bar-button-margin)
 325                                        (> tool-bar-button-margin 0))
 326                                   tool-bar-button-margin)
 327                                  (t 0)))
 328                    (relief (if (and (integerp tool-bar-button-relief)
 329                                     (> tool-bar-button-relief 0))
 330                                tool-bar-button-relief 3))
 331                    (lines (/ (+ image-height
 332                                 (* 2 margin)
 333                                 (* 2 relief)
 334                                 (1- char-height))
 335                              char-height))
 336                    (height (frame-parameter frame-initial-frame 'height))
 337                    (newparms (list (cons 'height (- height lines))))
 338                    (initial-top (cdr (assq 'top
 339                                            frame-initial-geometry-arguments)))
 340                    (top (frame-parameter frame-initial-frame 'top)))
 341               (when (and (consp initial-top) (eq '- (car initial-top)))
 342                 (let ((adjusted-top
 343                        (cond ((and (consp top)
 344                                    (eq '+ (car top)))
 345                               (list '+
 346                                     (+ (cadr top)
 347                                        (* lines char-height))))
 348                              ((and (consp top)
 349                                    (eq '- (car top)))
 350                               (list '-
 351                                     (- (cadr top)
 352                                        (* lines char-height))))
 353                              (t (+ top (* lines char-height))))))
 354                   (setq newparms
 355                         (append newparms
 356                                 `((top . ,adjusted-top))
 357                                 nil))))
 358               (modify-frame-parameters frame-initial-frame newparms)
 359               (tool-bar-mode -1)))))
 360
 361       ;; The initial frame we create above always has a minibuffer.
 362       ;; If the user wants to remove it, or make it a minibuffer-only
 363       ;; frame, then we'll have to delete the current frame and make a
 364       ;; new one; you can't remove or add a root window to/from an
 365       ;; existing frame.
 366       ;;
 367       ;; NOTE: default-frame-alist was nil when we created the
 368       ;; existing frame.  We need to explicitly include
 369       ;; default-frame-alist in the parameters of the screen we
 370       ;; create here, so that its new value, gleaned from the user's
 371       ;; .emacs file, will be applied to the existing screen.
 372       (if (not (eq (cdr (or (assq 'minibuffer initial-frame-alist)
 373                             (assq 'minibuffer default-frame-alist)
 374                             '(minibuffer . t)))
 375                    t))
 376           ;; Create the new frame.
 377           (let (parms new)
 378             ;; If the frame isn't visible yet, wait till it is.
 379             ;; If the user has to position the window,
 380             ;; Emacs doesn't know its real position until
 381             ;; the frame is seen to be visible.
 382             (while (not (cdr (assq 'visibility
 383                                    (frame-parameters frame-initial-frame))))
 384               (sleep-for 1))
 385             (setq parms (frame-parameters frame-initial-frame))
 386
 387             ;; Get rid of `name' unless it was specified explicitly before.
 388             (or (assq 'name frame-initial-frame-alist)
 389                 (setq parms (delq (assq 'name parms) parms)))
 390
 391             (setq parms (append initial-frame-alist
 392                                 default-frame-alist
 393                                 parms
 394                                 nil))
 395
 396             ;; Get rid of `reverse', because that was handled
 397             ;; when we first made the frame.
 398             (setq parms (cons '(reverse) (delq (assq 'reverse parms) parms)))
 399
 400             (if (assq 'height frame-initial-geometry-arguments)
 401                 (setq parms (assq-delete-all 'height parms)))
 402             (if (assq 'width frame-initial-geometry-arguments)
 403                 (setq parms (assq-delete-all 'width parms)))
 404             (if (assq 'left frame-initial-geometry-arguments)
 405                 (setq parms (assq-delete-all 'left parms)))
 406             (if (assq 'top frame-initial-geometry-arguments)
 407                 (setq parms (assq-delete-all 'top parms)))
 408             (setq new
 409                   (make-frame
 410                    ;; Use the geometry args that created the existing
 411                    ;; frame, rather than the parms we get for it.
 412                    (append frame-initial-geometry-arguments
 413                            '((user-size . t) (user-position . t))
 414                            parms)))
 415             ;; The initial frame, which we are about to delete, may be
 416             ;; the only frame with a minibuffer.  If it is, create a
 417             ;; new one.
 418             (or (delq frame-initial-frame (minibuffer-frame-list))
 419                 (make-initial-minibuffer-frame nil))
 420
 421             ;; If the initial frame is serving as a surrogate
 422             ;; minibuffer frame for any frames, we need to wean them
 423             ;; onto a new frame.  The default-minibuffer-frame
 424             ;; variable must be handled similarly.
 425             (let ((users-of-initial
 426                    (filtered-frame-list
 427                     (function (lambda (frame)
 428                                 (and (not (eq frame frame-initial-frame))
 429                                      (eq (window-frame
 430                                           (minibuffer-window frame))
 431                                          frame-initial-frame)))))))
 432               (if (or users-of-initial
 433                       (eq default-minibuffer-frame frame-initial-frame))
 434
 435                   ;; Choose an appropriate frame.  Prefer frames which
 436                   ;; are only minibuffers.
 437                   (let* ((new-surrogate
 438                           (car
 439                            (or (filtered-frame-list
 440                                 (function
 441                                  (lambda (frame)
 442                                    (eq (cdr (assq 'minibuffer
 443                                                   (frame-parameters frame)))
 444                                        'only))))
 445                                (minibuffer-frame-list))))
 446                          (new-minibuffer (minibuffer-window new-surrogate)))
 447
 448                     (if (eq default-minibuffer-frame frame-initial-frame)
 449                         (setq default-minibuffer-frame new-surrogate))
 450
 451                     ;; Wean the frames using frame-initial-frame as
 452                     ;; their minibuffer frame.
 453                     (mapcar
 454                      (function
 455                       (lambda (frame)
 456                         (modify-frame-parameters
 457                          frame (list (cons 'minibuffer new-minibuffer)))))
 458                      users-of-initial))))
 459
 460            ;; Redirect events enqueued at this frame to the new frame.
 461             ;; Is this a good idea?
 462             (redirect-frame-focus frame-initial-frame new)
 463
 464             ;; Finally, get rid of the old frame.
 465             (delete-frame frame-initial-frame t))
 466
 467         ;; Otherwise, we don't need all that rigamarole; just apply
 468         ;; the new parameters.
 469         (let (newparms allparms tail)
 470           (setq allparms (append initial-frame-alist
 471                                  default-frame-alist nil))
 472           (if (assq 'height frame-initial-geometry-arguments)
 473               (setq allparms (assq-delete-all 'height allparms)))
 474           (if (assq 'width frame-initial-geometry-arguments)
 475               (setq allparms (assq-delete-all 'width allparms)))
 476           (if (assq 'left frame-initial-geometry-arguments)
 477               (setq allparms (assq-delete-all 'left allparms)))
 478           (if (assq 'top frame-initial-geometry-arguments)
 479               (setq allparms (assq-delete-all 'top allparms)))
 480           (setq tail allparms)
 481           ;; Find just the parms that have changed since we first
 482           ;; made this frame.  Those are the ones actually set by
 483           ;; the init file.  For those parms whose values we already knew
 484           ;; (such as those spec'd by command line options)
 485           ;; it is undesirable to specify the parm again
 486           ;; once the user has seen the frame and been able to alter it
 487           ;; manually.
 488           (while tail
 489             (let (newval oldval)
 490               (setq oldval (assq (car (car tail))
 491                                  frame-initial-frame-alist))
 492               (setq newval (cdr (assq (car (car tail)) allparms)))
 493               (or (and oldval (eq (cdr oldval) newval))
 494                   (setq newparms
 495                         (cons (cons (car (car tail)) newval) newparms))))
 496             (setq tail (cdr tail)))
 497           (setq newparms (nreverse newparms))
 498           (modify-frame-parameters frame-initial-frame
 499                                    newparms)
 500           ;; If we changed the background color,
 501           ;; we need to update the background-mode parameter
 502           ;; and maybe some faces too.
 503           (when (assq 'background-color newparms)
 504             (unless (assq 'background-mode newparms)
 505               (frame-set-background-mode frame-initial-frame))
 506             (face-set-after-frame-default frame-initial-frame)))))
 507
 508     ;; Restore the original buffer.
 509     (set-buffer old-buffer)
 510
 511     ;; Make sure the initial frame can be GC'd if it is ever deleted.
 512     ;; Make sure frame-notice-user-settings does nothing if called twice.
 513     (setq frame-notice-user-settings nil)
 514     (setq frame-initial-frame nil)))
 515
 516 (defun make-initial-minibuffer-frame (display)
 517   (let ((parms (append minibuffer-frame-alist '((minibuffer . only)))))
 518     (if display
 519         (make-frame-on-display display parms)
 520       (make-frame parms))))
 521
 522 ;;;; Creation of additional frames, and other frame miscellanea
 523
 524 (defun modify-all-frames-parameters (alist)
 525   "Modify all current and future frames' parameters according to ALIST.
 526 This changes `default-frame-alist' and possibly `initial-frame-alist'.
 527 See help of `modify-frame-parameters' for more information."
 528   (let (element)                        ;; temp
 529     (dolist (frame (frame-list))
 530       (modify-frame-parameters frame alist))
 531
 532     (dolist (pair alist)                ;; conses to add/replace
 533       ;; initial-frame-alist needs setting only when
 534       ;; frame-notice-user-settings is true
 535       (and frame-notice-user-settings
 536            (setq element (assoc (car pair) initial-frame-alist))
 537            (setq initial-frame-alist (delq element initial-frame-alist)))
 538       (and (setq element (assoc (car pair) default-frame-alist))
 539            (setq default-frame-alist (delq element default-frame-alist)))))
 540   (and frame-notice-user-settings
 541        (setq initial-frame-alist (append initial-frame-alist alist)))
 542   (setq default-frame-alist (append default-frame-alist alist)))
 543
 544 (defun get-other-frame ()
 545   "Return some frame other than the current frame.
 546 Create one if necessary.  Note that the minibuffer frame, if separate,
 547 is not considered (see `next-frame')."
 548   (let ((s (if (equal (next-frame (selected-frame)) (selected-frame))
 549                (make-frame)
 550              (next-frame (selected-frame)))))
 551     s))
 552
 553 (defun next-multiframe-window ()
 554   "Select the next window, regardless of which frame it is on."
 555   (interactive)
 556   (select-window (next-window (selected-window)
 557                               (> (minibuffer-depth) 0)
 558                               0))
 559   (select-frame-set-input-focus (selected-frame)))
 560
 561 (defun previous-multiframe-window ()
 562   "Select the previous window, regardless of which frame it is on."
 563   (interactive)
 564   (select-window (previous-window (selected-window)
 565                                   (> (minibuffer-depth) 0)
 566                                   0))
 567   (select-frame-set-input-focus (selected-frame)))
 568
 569 (defun make-frame-on-display (display &optional parameters)
 570   "Make a frame on display DISPLAY.
 571 The optional second argument PARAMETERS specifies additional frame parameters."
 572   (interactive "sMake frame on display: ")
 573   (or (string-match "\\`[^:]*:[0-9]+\\(\\.[0-9]+\\)?\\'" display)
 574       (error "Invalid display, not HOST:SERVER or HOST:SERVER.SCREEN"))
 575   (make-frame (cons (cons 'display display) parameters)))
 576
 577 (defun make-frame-command ()
 578   "Make a new frame, and select it if the terminal displays only one frame."
 579   (interactive)
 580   (if (and window-system (not (eq window-system 'pc)))
 581       (make-frame)
 582     (select-frame (make-frame))))
 583
 584 (defvar before-make-frame-hook nil
 585   "Functions to run before a frame is created.")
 586
 587 (defvar after-make-frame-functions nil
 588   "Functions to run after a frame is created.
 589 The functions are run with one arg, the newly created frame.")
 590
 591 (defvar after-setting-font-hook nil
 592   "Functions to run after a frame's font has been changed.")
 593
 594 ;; Alias, kept temporarily.
 595 (define-obsolete-function-alias 'new-frame 'make-frame "22.1")
 596
 597 (defun make-frame (&optional parameters)
 598   "Return a newly created frame displaying the current buffer.
 599 Optional argument PARAMETERS is an alist of parameters for the new frame.
 600 Each element of PARAMETERS should have the form (NAME . VALUE), for example:
 601
 602  (name . STRING)        The frame should be named STRING.
 603
 604  (width . NUMBER)       The frame should be NUMBER characters in width.
 605  (height . NUMBER)      The frame should be NUMBER text lines high.
 606
 607 You cannot specify either `width' or `height', you must use neither or both.
 608
 609  (minibuffer . t)       The frame should have a minibuffer.
 610  (minibuffer . nil)     The frame should have no minibuffer.
 611  (minibuffer . only)    The frame should contain only a minibuffer.
 612  (minibuffer . WINDOW)  The frame should use WINDOW as its minibuffer window.
 613
 614 Before the frame is created (via `frame-creation-function'), functions on the
 615 hook `before-make-frame-hook' are run.  After the frame is created, functions
 616 on `after-make-frame-functions' are run with one arg, the newly created frame.
 617
 618 This function itself does not make the new frame the selected frame.
 619 The previously selected frame remains selected.  However, the
 620 window system may select the new frame for its own reasons, for
 621 instance if the frame appears under the mouse pointer and your
 622 setup is for focus to follow the pointer."
 623   (interactive)
 624   (run-hooks 'before-make-frame-hook)
 625   (let ((frame (funcall frame-creation-function parameters)))
 626     (run-hook-with-args 'after-make-frame-functions frame)
 627     frame))
 628
 629 (defun filtered-frame-list (predicate)
 630   "Return a list of all live frames which satisfy PREDICATE."
 631   (let* ((frames (frame-list))
 632          (list frames))
 633     (while (consp frames)
 634       (unless (funcall predicate (car frames))
 635         (setcar frames nil))
 636       (setq frames (cdr frames)))
 637     (delq nil list)))
 638
 639 (defun minibuffer-frame-list ()
 640   "Return a list of all frames with their own minibuffers."
 641   (filtered-frame-list
 642    (function (lambda (frame)
 643                (eq frame (window-frame (minibuffer-window frame)))))))
 644
 645 (defun frames-on-display-list (&optional display)
 646   "Return a list of all frames on DISPLAY.
 647 DISPLAY is a name of a display, a string of the form HOST:SERVER.SCREEN.
 648 If DISPLAY is omitted or nil, it defaults to the selected frame's display."
 649   (let* ((display (or display (frame-parameter nil 'display)))
 650          (func #'(lambda (frame)
 651                    (equal (frame-parameter frame 'display) display))))
 652     (filtered-frame-list func)))
 653
 654 (defun framep-on-display (&optional display)
 655   "Return the type of frames on DISPLAY.
 656 DISPLAY may be a display name or a frame.  If it is a frame, its type is
 657 returned.
 658 If DISPLAY is omitted or nil, it defaults to the selected frame's display.
 659 All frames on a given display are of the same type."
 660   (or (framep display)
 661       (framep (car (frames-on-display-list display)))))
 662
 663 (defun frame-remove-geometry-params (param-list)
 664   "Return the parameter list PARAM-LIST, but with geometry specs removed.
 665 This deletes all bindings in PARAM-LIST for `top', `left', `width',
 666 `height', `user-size' and `user-position' parameters.
 667 Emacs uses this to avoid overriding explicit moves and resizings from
 668 the user during startup."
 669   (setq param-list (cons nil param-list))
 670   (let ((tail param-list))
 671     (while (consp (cdr tail))
 672       (if (and (consp (car (cdr tail)))
 673                (memq (car (car (cdr tail)))
 674                      '(height width top left user-position user-size)))
 675           (progn
 676             (setq frame-initial-geometry-arguments
 677                   (cons (car (cdr tail)) frame-initial-geometry-arguments))
 678             (setcdr tail (cdr (cdr tail))))
 679         (setq tail (cdr tail)))))
 680   (setq frame-initial-geometry-arguments
 681         (nreverse frame-initial-geometry-arguments))
 682   (cdr param-list))
 683
 684 (defcustom focus-follows-mouse t
 685   "*Non-nil if window system changes focus when you move the mouse.
 686 You should set this variable to tell Emacs how your window manager
 687 handles focus, since there is no way in general for Emacs to find out
 688 automatically."
 689   :type 'boolean
 690   :group 'frames
 691   :version "20.3")
 692
 693 (defun select-frame-set-input-focus (frame)
 694   "Select FRAME, raise it, and set input focus, if possible."
 695     (select-frame frame)
 696     (raise-frame frame)
 697     ;; Ensure, if possible, that frame gets input focus.
 698     (cond ((memq window-system '(x mac))
 699            (x-focus-frame frame))
 700           ((eq window-system 'w32)
 701            (w32-focus-frame frame)))
 702     (cond (focus-follows-mouse
 703            (set-mouse-position (selected-frame) (1- (frame-width)) 0))))
 704
 705 (defun other-frame (arg)
 706   "Select the ARG'th different visible frame on current display, and raise it.
 707 All frames are arranged in a cyclic order.
 708 This command selects the frame ARG steps away in that order.
 709 A negative ARG moves in the opposite order.
 710
 711 To make this command work properly, you must tell Emacs
 712 how the system (or the window manager) generally handles
 713 focus-switching between windows.  If moving the mouse onto a window
 714 selects it (gives it focus), set `focus-follows-mouse' to t.
 715 Otherwise, that variable should be nil."
 716   (interactive "p")
 717   (let ((frame (selected-frame)))
 718     (while (> arg 0)
 719       (setq frame (next-frame frame))
 720       (while (not (eq (frame-visible-p frame) t))
 721         (setq frame (next-frame frame)))
 722       (setq arg (1- arg)))
 723     (while (< arg 0)
 724       (setq frame (previous-frame frame))
 725       (while (not (eq (frame-visible-p frame) t))
 726         (setq frame (previous-frame frame)))
 727       (setq arg (1+ arg)))
 728     (select-frame-set-input-focus frame)))
 729
 730 (defun iconify-or-deiconify-frame ()
 731   "Iconify the selected frame, or deiconify if it's currently an icon."
 732   (interactive)
 733   (if (eq (cdr (assq 'visibility (frame-parameters))) t)
 734       (iconify-frame)
 735     (make-frame-visible)))
 736
 737 (defun make-frame-names-alist ()
 738   (let* ((current-frame (selected-frame))
 739          (falist
 740           (cons
 741            (cons (frame-parameter current-frame 'name) current-frame) nil))
 742          (frame (next-frame nil t)))
 743     (while (not (eq frame current-frame))
 744       (progn
 745         (setq falist (cons (cons (frame-parameter frame 'name) frame) falist))
 746         (setq frame (next-frame frame t))))
 747     falist))
 748
 749 (defvar frame-name-history nil)
 750 (defun select-frame-by-name (name)
 751   "Select the frame on the current terminal whose name is NAME and raise it.
 752 If there is no frame by that name, signal an error."
 753   (interactive
 754    (let* ((frame-names-alist (make-frame-names-alist))
 755            (default (car (car frame-names-alist)))
 756            (input (completing-read
 757                    (format "Select Frame (default %s): " default)
 758                    frame-names-alist nil t nil 'frame-name-history)))
 759      (if (= (length input) 0)
 760          (list default)
 761        (list input))))
 762   (let* ((frame-names-alist (make-frame-names-alist))
 763          (frame (cdr (assoc name frame-names-alist))))
 764     (or frame
 765         (error "There is no frame named `%s'" name))
 766     (make-frame-visible frame)
 767     (raise-frame frame)
 768     (select-frame frame)
 769     ;; Ensure, if possible, that frame gets input focus.
 770     (cond ((memq window-system '(x mac))
 771            (x-focus-frame frame))
 772           ((eq window-system 'w32)
 773            (w32-focus-frame frame)))
 774     (when focus-follows-mouse
 775       (set-mouse-position frame (1- (frame-width frame)) 0))))
 776 \f
 777 ;;;; Frame configurations
 778
 779 (defun current-frame-configuration ()
 780   "Return a list describing the positions and states of all frames.
 781 Its car is `frame-configuration'.
 782 Each element of the cdr is a list of the form (FRAME ALIST WINDOW-CONFIG),
 783 where
 784   FRAME is a frame object,
 785   ALIST is an association list specifying some of FRAME's parameters, and
 786   WINDOW-CONFIG is a window configuration object for FRAME."
 787   (cons 'frame-configuration
 788         (mapcar (function
 789                  (lambda (frame)
 790                    (list frame
 791                          (frame-parameters frame)
 792                          (current-window-configuration frame))))
 793                 (frame-list))))
 794
 795 (defun set-frame-configuration (configuration &optional nodelete)
 796   "Restore the frames to the state described by CONFIGURATION.
 797 Each frame listed in CONFIGURATION has its position, size, window
 798 configuration, and other parameters set as specified in CONFIGURATION.
 799 However, this function does not restore deleted frames.
 800
 801 Ordinarily, this function deletes all existing frames not
 802 listed in CONFIGURATION.  But if optional second argument NODELETE
 803 is given and non-nil, the unwanted frames are iconified instead."
 804   (or (frame-configuration-p configuration)
 805       (signal 'wrong-type-argument
 806               (list 'frame-configuration-p configuration)))
 807   (let ((config-alist (cdr configuration))
 808         frames-to-delete)
 809     (mapcar (function
 810              (lambda (frame)
 811                (let ((parameters (assq frame config-alist)))
 812                  (if parameters
 813                      (progn
 814                        (modify-frame-parameters
 815                         frame
 816                         ;; Since we can't set a frame's minibuffer status,
 817                         ;; we might as well omit the parameter altogether.
 818                         (let* ((parms (nth 1 parameters))
 819                                (mini (assq 'minibuffer parms)))
 820                           (if mini (setq parms (delq mini parms)))
 821                           parms))
 822                        (set-window-configuration (nth 2 parameters)))
 823                    (setq frames-to-delete (cons frame frames-to-delete))))))
 824             (frame-list))
 825     (if nodelete
 826         ;; Note: making frames invisible here was tried
 827         ;; but led to some strange behavior--each time the frame
 828         ;; was made visible again, the window manager asked afresh
 829         ;; for where to put it.
 830         (mapcar 'iconify-frame frames-to-delete)
 831       (mapcar 'delete-frame frames-to-delete))))
 832 \f
 833 ;;;; Convenience functions for accessing and interactively changing
 834 ;;;; frame parameters.
 835
 836 (defun frame-height (&optional frame)
 837   "Return number of lines available for display on FRAME.
 838 If FRAME is omitted, describe the currently selected frame."
 839   (cdr (assq 'height (frame-parameters frame))))
 840
 841 (defun frame-width (&optional frame)
 842   "Return number of columns available for display on FRAME.
 843 If FRAME is omitted, describe the currently selected frame."
 844   (cdr (assq 'width (frame-parameters frame))))
 845
 846 (defalias 'set-default-font 'set-frame-font)
 847 (defun set-frame-font (font-name &optional keep-size)
 848   "Set the font of the selected frame to FONT-NAME.
 849 When called interactively, prompt for the name of the font to use.
 850 To get the frame's current default font, use `frame-parameters'.
 851
 852 The default behavior is to keep the numbers of lines and columns in
 853 the frame, thus may change its pixel size.  If optional KEEP-SIZE is
 854 non-nil (interactively, prefix argument) the current frame size (in
 855 pixels) is kept by adjusting the numbers of the lines and columns."
 856   (interactive
 857    (let* ((completion-ignore-case t)
 858           (font (completing-read "Font name: "
 859                          (mapcar #'list
 860                                  ;; x-list-fonts will fail with an error
 861                                  ;; if this frame doesn't support fonts.
 862                                  (x-list-fonts "*" nil (selected-frame)))
 863                          nil nil nil nil
 864                          (frame-parameter nil 'font))))
 865      (list font current-prefix-arg)))
 866   (let (fht fwd)
 867     (if keep-size
 868         (setq fht (* (frame-parameter nil 'height) (frame-char-height))
 869               fwd (* (frame-parameter nil 'width)  (frame-char-width))))
 870     (modify-frame-parameters (selected-frame)
 871                              (list (cons 'font font-name)))
 872     (if keep-size
 873         (modify-frame-parameters
 874          (selected-frame)
 875          (list (cons 'height (round fht (frame-char-height)))
 876                (cons 'width (round fwd (frame-char-width)))))))
 877   (run-hooks 'after-setting-font-hook 'after-setting-font-hooks))
 878
 879 (defun set-frame-parameter (frame parameter value)
 880   "Set frame parameter PARAMETER to VALUE on FRAME.
 881 If FRAME is nil, it defaults to the selected frame.
 882 See `modify-frame-parameters.'"
 883   (modify-frame-parameters frame (list (cons parameter value))))
 884
 885 (defun set-background-color (color-name)
 886   "Set the background color of the selected frame to COLOR-NAME.
 887 When called interactively, prompt for the name of the color to use.
 888 To get the frame's current background color, use `frame-parameters'."
 889   (interactive (list (facemenu-read-color "Background color: ")))
 890   (modify-frame-parameters (selected-frame)
 891                            (list (cons 'background-color color-name)))
 892   (or window-system
 893       (face-set-after-frame-default (selected-frame))))
 894
 895 (defun set-foreground-color (color-name)
 896   "Set the foreground color of the selected frame to COLOR-NAME.
 897 When called interactively, prompt for the name of the color to use.
 898 To get the frame's current foreground color, use `frame-parameters'."
 899   (interactive (list (facemenu-read-color "Foreground color: ")))
 900   (modify-frame-parameters (selected-frame)
 901                            (list (cons 'foreground-color color-name)))
 902   (or window-system
 903       (face-set-after-frame-default (selected-frame))))
 904
 905 (defun set-cursor-color (color-name)
 906   "Set the text cursor color of the selected frame to COLOR-NAME.
 907 When called interactively, prompt for the name of the color to use.
 908 To get the frame's current cursor color, use `frame-parameters'."
 909   (interactive (list (facemenu-read-color "Cursor color: ")))
 910   (modify-frame-parameters (selected-frame)
 911                            (list (cons 'cursor-color color-name))))
 912
 913 (defun set-mouse-color (color-name)
 914   "Set the color of the mouse pointer of the selected frame to COLOR-NAME.
 915 When called interactively, prompt for the name of the color to use.
 916 To get the frame's current mouse color, use `frame-parameters'."
 917   (interactive (list (facemenu-read-color "Mouse color: ")))
 918   (modify-frame-parameters (selected-frame)
 919                            (list (cons 'mouse-color
 920                                        (or color-name
 921                                            (cdr (assq 'mouse-color
 922                                                       (frame-parameters))))))))
 923
 924 (defun set-border-color (color-name)
 925   "Set the color of the border of the selected frame to COLOR-NAME.
 926 When called interactively, prompt for the name of the color to use.
 927 To get the frame's current border color, use `frame-parameters'."
 928   (interactive (list (facemenu-read-color "Border color: ")))
 929   (modify-frame-parameters (selected-frame)
 930                            (list (cons 'border-color color-name))))
 931
 932 (defun auto-raise-mode (arg)
 933   "Toggle whether or not the selected frame should auto-raise.
 934 With arg, turn auto-raise mode on if and only if arg is positive.
 935 Note that this controls Emacs's own auto-raise feature.
 936 Some window managers allow you to enable auto-raise for certain windows.
 937 You can use that for Emacs windows if you wish, but if you do,
 938 that is beyond the control of Emacs and this command has no effect on it."
 939   (interactive "P")
 940   (if (null arg)
 941       (setq arg
 942             (if (cdr (assq 'auto-raise (frame-parameters (selected-frame))))
 943                 -1 1)))
 944   (if (> arg 0)
 945       (raise-frame (selected-frame)))
 946   (modify-frame-parameters (selected-frame)
 947                            (list (cons 'auto-raise (> arg 0)))))
 948
 949 (defun auto-lower-mode (arg)
 950   "Toggle whether or not the selected frame should auto-lower.
 951 With arg, turn auto-lower mode on if and only if arg is positive.
 952 Note that this controls Emacs's own auto-lower feature.
 953 Some window managers allow you to enable auto-lower for certain windows.
 954 You can use that for Emacs windows if you wish, but if you do,
 955 that is beyond the control of Emacs and this command has no effect on it."
 956   (interactive "P")
 957   (if (null arg)
 958       (setq arg
 959             (if (cdr (assq 'auto-lower (frame-parameters (selected-frame))))
 960                 -1 1)))
 961   (modify-frame-parameters (selected-frame)
 962                            (list (cons 'auto-lower (> arg 0)))))
 963 (defun set-frame-name (name)
 964   "Set the name of the selected frame to NAME.
 965 When called interactively, prompt for the name of the frame.
 966 The frame name is displayed on the modeline if the terminal displays only
 967 one frame, otherwise the name is displayed on the frame's caption bar."
 968   (interactive "sFrame name: ")
 969   (modify-frame-parameters (selected-frame)
 970                            (list (cons 'name name))))
 971
 972 (defun frame-current-scroll-bars (&optional frame)
 973   "Return the current scroll-bar settings in frame FRAME.
 974 Value is a cons (VERTICAL . HORIZ0NTAL) where VERTICAL specifies the
 975 current location of the vertical scroll-bars (left, right, or nil),
 976 and HORIZONTAL specifies the current location of the horizontal scroll
 977 bars (top, bottom, or nil)."
 978   (let ((vert (frame-parameter frame 'vertical-scroll-bars))
 979         (hor nil))
 980     (unless (memq vert '(left right nil))
 981       (setq vert default-frame-scroll-bars))
 982     (cons vert hor)))
 983 \f
 984 ;;;; Frame/display capabilities.
 985 (defun display-mouse-p (&optional display)
 986   "Return non-nil if DISPLAY has a mouse available.
 987 DISPLAY can be a display name, a frame, or nil (meaning the selected
 988 frame's display)."
 989   (let ((frame-type (framep-on-display display)))
 990     (cond
 991      ((eq frame-type 'pc)
 992       (msdos-mouse-p))
 993      ((eq system-type 'windows-nt)
 994       (with-no-warnings
 995        (> w32-num-mouse-buttons 0)))
 996      ((memq frame-type '(x mac))
 997       t)    ;; We assume X and Mac *always* have a pointing device
 998      (t
 999       (or (and (featurep 'xt-mouse)
1000                xterm-mouse-mode)
1001           ;; t-mouse is distributed with the GPM package.  It doesn't have
1002           ;; a toggle.
1003           (featurep 't-mouse))))))
1004
1005 (defun display-popup-menus-p (&optional display)
1006   "Return non-nil if popup menus are supported on DISPLAY.
1007 DISPLAY can be a display name, a frame, or nil (meaning the selected
1008 frame's display).
1009 Support for popup menus requires that the mouse be available."
1010   (and
1011    (let ((frame-type (framep-on-display display)))
1012      (memq frame-type '(x w32 pc mac)))
1013    (display-mouse-p display)))
1014
1015 (defun display-graphic-p (&optional display)
1016   "Return non-nil if DISPLAY is a graphic display.
1017 Graphical displays are those which are capable of displaying several
1018 frames and several different fonts at once.  This is true for displays
1019 that use a window system such as X, and false for text-only terminals.
1020 DISPLAY can be a display name, a frame, or nil (meaning the selected
1021 frame's display)."
1022   (not (null (memq (framep-on-display display) '(x w32 mac)))))
1023
1024 (defun display-images-p (&optional display)
1025   "Return non-nil if DISPLAY can display images.
1026
1027 DISPLAY can be a display name, a frame, or nil (meaning the selected
1028 frame's display)."
1029   (and (display-graphic-p display)
1030        (fboundp 'image-mask-p)
1031        (fboundp 'image-size)))
1032
1033 (defalias 'display-multi-frame-p 'display-graphic-p)
1034 (defalias 'display-multi-font-p 'display-graphic-p)
1035
1036 (defun display-selections-p (&optional display)
1037   "Return non-nil if DISPLAY supports selections.
1038 A selection is a way to transfer text or other data between programs
1039 via special system buffers called `selection' or `cut buffer' or
1040 `clipboard'.
1041 DISPLAY can be a display name, a frame, or nil (meaning the selected
1042 frame's display)."
1043   (let ((frame-type (framep-on-display display)))
1044     (cond
1045      ((eq frame-type 'pc)
1046       ;; MS-DOG frames support selections when Emacs runs inside
1047       ;; the Windows' DOS Box.
1048       (with-no-warnings
1049        (not (null dos-windows-version))))
1050      ((memq frame-type '(x w32 mac))
1051       t)    ;; FIXME?
1052      (t
1053       nil))))
1054
1055 (defun display-screens (&optional display)
1056   "Return the number of screens associated with DISPLAY."
1057   (let ((frame-type (framep-on-display display)))
1058     (cond
1059      ((memq frame-type '(x w32 mac))
1060       (x-display-screens display))
1061      (t
1062       1))))
1063
1064 (defun display-pixel-height (&optional display)
1065   "Return the height of DISPLAY's screen in pixels.
1066 For character terminals, each character counts as a single pixel."
1067   (let ((frame-type (framep-on-display display)))
1068     (cond
1069      ((memq frame-type '(x w32 mac))
1070       (x-display-pixel-height display))
1071      (t
1072       (frame-height (if (framep display) display (selected-frame)))))))
1073
1074 (defun display-pixel-width (&optional display)
1075   "Return the width of DISPLAY's screen in pixels.
1076 For character terminals, each character counts as a single pixel."
1077   (let ((frame-type (framep-on-display display)))
1078     (cond
1079      ((memq frame-type '(x w32 mac))
1080       (x-display-pixel-width display))
1081      (t
1082       (frame-width (if (framep display) display (selected-frame)))))))
1083
1084 (defun display-mm-height (&optional display)
1085   "Return the height of DISPLAY's screen in millimeters.
1086 If the information is unavailable, value is nil."
1087   (and (memq (framep-on-display display) '(x w32 mac))
1088        (x-display-mm-height display)))
1089
1090 (defun display-mm-width (&optional display)
1091   "Return the width of DISPLAY's screen in millimeters.
1092 If the information is unavailable, value is nil."
1093   (and (memq (framep-on-display display) '(x w32 mac))
1094        (x-display-mm-width display)))
1095
1096 (defun display-backing-store (&optional display)
1097   "Return the backing store capability of DISPLAY's screen.
1098 The value may be `always', `when-mapped', `not-useful', or nil if
1099 the question is inapplicable to a certain kind of display."
1100   (let ((frame-type (framep-on-display display)))
1101     (cond
1102      ((memq frame-type '(x w32 mac))
1103       (x-display-backing-store display))
1104      (t
1105       'not-useful))))
1106
1107 (defun display-save-under (&optional display)
1108   "Return non-nil if DISPLAY's screen supports the SaveUnder feature."
1109   (let ((frame-type (framep-on-display display)))
1110     (cond
1111      ((memq frame-type '(x w32 mac))
1112       (x-display-save-under display))
1113      (t
1114       'not-useful))))
1115
1116 (defun display-planes (&optional display)
1117   "Return the number of planes supported by DISPLAY."
1118   (let ((frame-type (framep-on-display display)))
1119     (cond
1120      ((memq frame-type '(x w32 mac))
1121       (x-display-planes display))
1122      ((eq frame-type 'pc)
1123       4)
1124      (t
1125       (truncate (log (length (tty-color-alist)) 2))))))
1126
1127 (defun display-color-cells (&optional display)
1128   "Return the number of color cells supported by DISPLAY."
1129   (let ((frame-type (framep-on-display display)))
1130     (cond
1131      ((memq frame-type '(x w32 mac))
1132       (x-display-color-cells display))
1133      ((eq frame-type 'pc)
1134       16)
1135      (t
1136       (tty-display-color-cells)))))
1137
1138 (defun display-visual-class (&optional display)
1139   "Returns the visual class of DISPLAY.
1140 The value is one of the symbols `static-gray', `gray-scale',
1141 `static-color', `pseudo-color', `true-color', or `direct-color'."
1142   (let ((frame-type (framep-on-display display)))
1143     (cond
1144      ((memq frame-type '(x w32 mac))
1145       (x-display-visual-class display))
1146      ((and (memq frame-type '(pc t))
1147            (tty-display-color-p display))
1148       'static-color)
1149      (t
1150       'static-gray))))
1151
1152 \f
1153 ;;;; Aliases for backward compatibility with Emacs 18.
1154 (define-obsolete-function-alias 'screen-height 'frame-height) ;before 19.15
1155 (define-obsolete-function-alias 'screen-width 'frame-width) ;before 19.15
1156
1157 (defun set-screen-width (cols &optional pretend)
1158   "Change the size of the screen to COLS columns.
1159 Optional second arg non-nil means that redisplay should use COLS columns
1160 but that the idea of the actual width of the frame should not be changed.
1161 This function is provided only for compatibility with Emacs 18."
1162   (set-frame-width (selected-frame) cols pretend))
1163
1164 (defun set-screen-height (lines &optional pretend)
1165   "Change the height of the screen to LINES lines.
1166 Optional second arg non-nil means that redisplay should use LINES lines
1167 but that the idea of the actual height of the screen should not be changed.
1168 This function is provided only for compatibility with Emacs 18."
1169   (set-frame-height (selected-frame) lines pretend))
1170
1171 (defun delete-other-frames (&optional frame)
1172   "Delete all frames except FRAME.
1173 If FRAME uses another frame's minibuffer, the minibuffer frame is
1174 left untouched.  FRAME nil or omitted means use the selected frame."
1175   (interactive)
1176   (unless frame
1177     (setq frame (selected-frame)))
1178   (let* ((mini-frame (window-frame (minibuffer-window frame)))
1179          (frames (delq mini-frame (delq frame (frame-list)))))
1180     ;; Delete mon-minibuffer-only frames first, because `delete-frame'
1181     ;; signals an error when trying to delete a mini-frame that's
1182     ;; still in use by another frame.
1183     (dolist (frame frames)
1184       (unless (eq (frame-parameter frame 'minibuffer) 'only)
1185         (delete-frame frame)))
1186     ;; Delete minibuffer-only frames.
1187     (dolist (frame frames)
1188       (when (eq (frame-parameter frame 'minibuffer) 'only)
1189         (delete-frame frame)))))
1190
1191 (make-obsolete 'set-screen-width 'set-frame-width) ;before 19.15
1192 (make-obsolete 'set-screen-height 'set-frame-height) ;before 19.15
1193
1194 ;; miscellaneous obsolescence declarations
1195 (define-obsolete-variable-alias 'delete-frame-hook
1196     'delete-frame-functions "22.1")
1197
1198 \f
1199 ;; Highlighting trailing whitespace.
1200
1201 (make-variable-buffer-local 'show-trailing-whitespace)
1202
1203 (defcustom show-trailing-whitespace nil
1204   "*Non-nil means highlight trailing whitespace.
1205 This is done in the face `trailing-whitespace'."
1206   :type 'boolean
1207   :group 'whitespace-faces)
1208
1209
1210 \f
1211 ;; Scrolling
1212
1213 (defgroup scrolling nil
1214   "Scrolling windows."
1215   :version "21.1"
1216   :group 'frames)
1217
1218 (defcustom auto-hscroll-mode t
1219   "*Allow or disallow automatic scrolling windows horizontally.
1220 If non-nil, windows are automatically scrolled horizontally to make
1221 point visible."
1222   :version "21.1"
1223   :type 'boolean
1224   :group 'scrolling)
1225 (defvaralias 'automatic-hscrolling 'auto-hscroll-mode)
1226
1227 \f
1228 ;; Blinking cursor
1229
1230 (defgroup cursor nil
1231   "Displaying text cursors."
1232   :version "21.1"
1233   :group 'frames)
1234
1235 (defcustom blink-cursor-delay 0.5
1236   "*Seconds of idle time after which cursor starts to blink."
1237   :type 'number
1238   :group 'cursor)
1239
1240 (defcustom blink-cursor-interval 0.5
1241   "*Length of cursor blink interval in seconds."
1242   :type 'number
1243   :group 'cursor)
1244
1245 (defvar blink-cursor-idle-timer nil
1246   "Timer started after `blink-cursor-delay' seconds of Emacs idle time.
1247 The function `blink-cursor-start' is called when the timer fires.")
1248
1249 (defvar blink-cursor-timer nil
1250   "Timer started from `blink-cursor-start'.
1251 This timer calls `blink-cursor-timer-function' every
1252 `blink-cursor-interval' seconds.")
1253
1254 (define-minor-mode blink-cursor-mode
1255   "Toggle blinking cursor mode.
1256 With a numeric argument, turn blinking cursor mode on iff ARG is positive.
1257 When blinking cursor mode is enabled, the cursor of the selected
1258 window blinks.
1259
1260 Note that this command is effective only when Emacs
1261 displays through a window system, because then Emacs does its own
1262 cursor display.  On a text-only terminal, this is not implemented."
1263   :init-value (not (or noninteractive
1264                        no-blinking-cursor
1265                        (eq system-type 'ms-dos)
1266                        (not (memq window-system '(x w32 mac)))))
1267   :initialize 'custom-initialize-safe-default
1268   :group 'cursor
1269   :global t
1270   (if blink-cursor-idle-timer (cancel-timer blink-cursor-idle-timer))
1271   (if blink-cursor-timer (cancel-timer blink-cursor-timer))
1272   (setq blink-cursor-idle-timer nil
1273         blink-cursor-timer nil)
1274   (if blink-cursor-mode
1275       (progn
1276         ;; Hide the cursor.
1277         ;;(internal-show-cursor nil nil)
1278         (setq blink-cursor-idle-timer
1279               (run-with-idle-timer blink-cursor-delay
1280                                    blink-cursor-delay
1281                                    'blink-cursor-start)))
1282     (internal-show-cursor nil t)))
1283
1284 (define-obsolete-variable-alias 'blink-cursor 'blink-cursor-mode "22.1")
1285
1286 (defun blink-cursor-start ()
1287   "Timer function called from the timer `blink-cursor-idle-timer'.
1288 This starts the timer `blink-cursor-timer', which makes the cursor blink
1289 if appropriate.  It also arranges to cancel that timer when the next
1290 command starts, by installing a pre-command hook."
1291   (when (null blink-cursor-timer)
1292     (add-hook 'pre-command-hook 'blink-cursor-end)
1293     (internal-show-cursor nil nil)
1294     (setq blink-cursor-timer
1295           (run-with-timer blink-cursor-interval blink-cursor-interval
1296                           'blink-cursor-timer-function))))
1297
1298 (defun blink-cursor-timer-function ()
1299   "Timer function of timer `blink-cursor-timer'."
1300   (internal-show-cursor nil (not (internal-show-cursor-p))))
1301
1302 (defun blink-cursor-end ()
1303   "Stop cursor blinking.
1304 This is installed as a pre-command hook by `blink-cursor-start'.
1305 When run, it cancels the timer `blink-cursor-timer' and removes
1306 itself as a pre-command hook."
1307   (remove-hook 'pre-command-hook 'blink-cursor-end)
1308   (internal-show-cursor nil t)
1309   (cancel-timer blink-cursor-timer)
1310   (setq blink-cursor-timer nil))
1311
1312
1313 \f
1314 ;; Hourglass pointer
1315
1316 (defcustom display-hourglass t
1317   "*Non-nil means show an hourglass pointer, when Emacs is busy.
1318 This feature only works when on a window system that can change
1319 cursor shapes."
1320   :type 'boolean
1321   :group 'cursor)
1322
1323 (defcustom hourglass-delay 1
1324   "*Seconds to wait before displaying an hourglass pointer when Emacs is busy."
1325   :type 'number
1326   :group 'cursor)
1327
1328 \f
1329 (defcustom cursor-in-non-selected-windows t
1330   "*Non-nil means show a hollow box cursor in non-selected windows.
1331 If nil, don't show a cursor except in the selected window.
1332 Use Custom to set this variable to get the display updated."
1333   :tag "Cursor In Non-selected Windows"
1334   :type 'boolean
1335   :group 'cursor
1336   :set #'(lambda (symbol value)
1337            (set-default symbol value)
1338            (force-mode-line-update t)))
1339
1340 \f
1341 ;;;; Key bindings
1342
1343 (define-key ctl-x-5-map "2" 'make-frame-command)
1344 (define-key ctl-x-5-map "1" 'delete-other-frames)
1345 (define-key ctl-x-5-map "0" 'delete-frame)
1346 (define-key ctl-x-5-map "o" 'other-frame)
1347
1348 (provide 'frame)
1349
1350 ;; arch-tag: 82979c70-b8f2-4306-b2ad-ddbd6b328b56
1351 ;;; frame.el ends here