lisp/frame.el

   1 ;;; frame.el --- multi-frame management independent of window systems
   2
   3 ;; Copyright (C) 1993, 1994, 1996, 1997, 2000, 2001, 2003, 2004, 2005
   4 ;;   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., 59 Temple Place - Suite 330,
  24 ;; Boston, MA 02111-1307, 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 (defalias 'new-frame 'make-frame)
 596 (make-obsolete 'new-frame 'make-frame "22.1")
 597
 598 (defun make-frame (&optional parameters)
 599   "Return a newly created frame displaying the current buffer.
 600 Optional argument PARAMETERS is an alist of parameters for the new frame.
 601 Each element of PARAMETERS should have the form (NAME . VALUE), for example:
 602
 603  (name . STRING)        The frame should be named STRING.
 604
 605  (width . NUMBER)       The frame should be NUMBER characters in width.
 606  (height . NUMBER)      The frame should be NUMBER text lines high.
 607
 608 You cannot specify either `width' or `height', you must use neither or both.
 609
 610  (minibuffer . t)       The frame should have a minibuffer.
 611  (minibuffer . nil)     The frame should have no minibuffer.
 612  (minibuffer . only)    The frame should contain only a minibuffer.
 613  (minibuffer . WINDOW)  The frame should use WINDOW as its minibuffer window.
 614
 615 Before the frame is created (via `frame-creation-function'), functions on the
 616 hook `before-make-frame-hook' are run.  After the frame is created, functions
 617 on `after-make-frame-functions' are run with one arg, the newly created frame.
 618
 619 This function itself does not make the new frame the selected frame.
 620 The previously selected frame remains selected.  However, the
 621 window system may select the new frame for its own reasons, for
 622 instance if the frame appears under the mouse pointer and your
 623 setup is for focus to follow the pointer."
 624   (interactive)
 625   (run-hooks 'before-make-frame-hook)
 626   (let ((frame (funcall frame-creation-function parameters)))
 627     (run-hook-with-args 'after-make-frame-functions frame)
 628     frame))
 629
 630 (defun filtered-frame-list (predicate)
 631   "Return a list of all live frames which satisfy PREDICATE."
 632   (let* ((frames (frame-list))
 633          (list frames))
 634     (while (consp frames)
 635       (unless (funcall predicate (car frames))
 636         (setcar frames nil))
 637       (setq frames (cdr frames)))
 638     (delq nil list)))
 639
 640 (defun minibuffer-frame-list ()
 641   "Return a list of all frames with their own minibuffers."
 642   (filtered-frame-list
 643    (function (lambda (frame)
 644                (eq frame (window-frame (minibuffer-window frame)))))))
 645
 646 (defun frames-on-display-list (&optional display)
 647   "Return a list of all frames on DISPLAY.
 648 DISPLAY is a name of a display, a string of the form HOST:SERVER.SCREEN.
 649 If DISPLAY is omitted or nil, it defaults to the selected frame's display."
 650   (let* ((display (or display (frame-parameter nil 'display)))
 651          (func #'(lambda (frame)
 652                    (equal (frame-parameter frame 'display) display))))
 653     (filtered-frame-list func)))
 654
 655 (defun framep-on-display (&optional display)
 656   "Return the type of frames on DISPLAY.
 657 DISPLAY may be a display name or a frame.  If it is a frame, its type is
 658 returned.
 659 If DISPLAY is omitted or nil, it defaults to the selected frame's display.
 660 All frames on a given display are of the same type."
 661   (or (framep display)
 662       (framep (car (frames-on-display-list display)))))
 663
 664 (defun frame-remove-geometry-params (param-list)
 665   "Return the parameter list PARAM-LIST, but with geometry specs removed.
 666 This deletes all bindings in PARAM-LIST for `top', `left', `width',
 667 `height', `user-size' and `user-position' parameters.
 668 Emacs uses this to avoid overriding explicit moves and resizings from
 669 the user during startup."
 670   (setq param-list (cons nil param-list))
 671   (let ((tail param-list))
 672     (while (consp (cdr tail))
 673       (if (and (consp (car (cdr tail)))
 674                (memq (car (car (cdr tail)))
 675                      '(height width top left user-position user-size)))
 676           (progn
 677             (setq frame-initial-geometry-arguments
 678                   (cons (car (cdr tail)) frame-initial-geometry-arguments))
 679             (setcdr tail (cdr (cdr tail))))
 680         (setq tail (cdr tail)))))
 681   (setq frame-initial-geometry-arguments
 682         (nreverse frame-initial-geometry-arguments))
 683   (cdr param-list))
 684
 685 (defcustom focus-follows-mouse t
 686   "*Non-nil if window system changes focus when you move the mouse.
 687 You should set this variable to tell Emacs how your window manager
 688 handles focus, since there is no way in general for Emacs to find out
 689 automatically."
 690   :type 'boolean
 691   :group 'frames
 692   :version "20.3")
 693
 694 (defun select-frame-set-input-focus (frame)
 695   "Select FRAME, raise it, and set input focus, if possible."
 696     (select-frame frame)
 697     (raise-frame frame)
 698     ;; Ensure, if possible, that frame gets input focus.
 699     (cond ((eq window-system 'x)
 700            (x-focus-frame frame))
 701           ((eq window-system 'w32)
 702            (w32-focus-frame frame)))
 703     (cond (focus-follows-mouse
 704            (set-mouse-position (selected-frame) (1- (frame-width)) 0))))
 705
 706 (defun other-frame (arg)
 707   "Select the ARG'th different visible frame on current display, and raise it.
 708 All frames are arranged in a cyclic order.
 709 This command selects the frame ARG steps away in that order.
 710 A negative ARG moves in the opposite order.
 711
 712 To make this command work properly, you must tell Emacs
 713 how the system (or the window manager) generally handles
 714 focus-switching between windows.  If moving the mouse onto a window
 715 selects it (gives it focus), set `focus-follows-mouse' to t.
 716 Otherwise, that variable should be nil."
 717   (interactive "p")
 718   (let ((frame (selected-frame)))
 719     (while (> arg 0)
 720       (setq frame (next-frame frame))
 721       (while (not (eq (frame-visible-p frame) t))
 722         (setq frame (next-frame frame)))
 723       (setq arg (1- arg)))
 724     (while (< arg 0)
 725       (setq frame (previous-frame frame))
 726       (while (not (eq (frame-visible-p frame) t))
 727         (setq frame (previous-frame frame)))
 728       (setq arg (1+ arg)))
 729     (select-frame-set-input-focus frame)))
 730
 731 (defun iconify-or-deiconify-frame ()
 732   "Iconify the selected frame, or deiconify if it's currently an icon."
 733   (interactive)
 734   (if (eq (cdr (assq 'visibility (frame-parameters))) t)
 735       (iconify-frame)
 736     (make-frame-visible)))
 737
 738 (defun make-frame-names-alist ()
 739   (let* ((current-frame (selected-frame))
 740          (falist
 741           (cons
 742            (cons (frame-parameter current-frame 'name) current-frame) nil))
 743          (frame (next-frame nil t)))
 744     (while (not (eq frame current-frame))
 745       (progn
 746         (setq falist (cons (cons (frame-parameter frame 'name) frame) falist))
 747         (setq frame (next-frame frame t))))
 748     falist))
 749
 750 (defvar frame-name-history nil)
 751 (defun select-frame-by-name (name)
 752   "Select the frame on the current terminal whose name is NAME and raise it.
 753 If there is no frame by that name, signal an error."
 754   (interactive
 755    (let* ((frame-names-alist (make-frame-names-alist))
 756            (default (car (car frame-names-alist)))
 757            (input (completing-read
 758                    (format "Select Frame (default %s): " default)
 759                    frame-names-alist nil t nil 'frame-name-history)))
 760      (if (= (length input) 0)
 761          (list default)
 762        (list input))))
 763   (let* ((frame-names-alist (make-frame-names-alist))
 764          (frame (cdr (assoc name frame-names-alist))))
 765     (or frame
 766         (error "There is no frame named `%s'" name))
 767     (make-frame-visible frame)
 768     (raise-frame frame)
 769     (select-frame frame)
 770     ;; Ensure, if possible, that frame gets input focus.
 771     (cond ((eq window-system 'x)
 772            (x-focus-frame frame))
 773           ((eq window-system 'w32)
 774            (w32-focus-frame frame)))
 775     (when focus-follows-mouse
 776       (set-mouse-position frame (1- (frame-width frame)) 0))))
 777 \f
 778 ;;;; Frame configurations
 779
 780 (defun current-frame-configuration ()
 781   "Return a list describing the positions and states of all frames.
 782 Its car is `frame-configuration'.
 783 Each element of the cdr is a list of the form (FRAME ALIST WINDOW-CONFIG),
 784 where
 785   FRAME is a frame object,
 786   ALIST is an association list specifying some of FRAME's parameters, and
 787   WINDOW-CONFIG is a window configuration object for FRAME."
 788   (cons 'frame-configuration
 789         (mapcar (function
 790                  (lambda (frame)
 791                    (list frame
 792                          (frame-parameters frame)
 793                          (current-window-configuration frame))))
 794                 (frame-list))))
 795
 796 (defun set-frame-configuration (configuration &optional nodelete)
 797   "Restore the frames to the state described by CONFIGURATION.
 798 Each frame listed in CONFIGURATION has its position, size, window
 799 configuration, and other parameters set as specified in CONFIGURATION.
 800 However, this function does not restore deleted frames.
 801
 802 Ordinarily, this function deletes all existing frames not
 803 listed in CONFIGURATION.  But if optional second argument NODELETE
 804 is given and non-nil, the unwanted frames are iconified instead."
 805   (or (frame-configuration-p configuration)
 806       (signal 'wrong-type-argument
 807               (list 'frame-configuration-p configuration)))
 808   (let ((config-alist (cdr configuration))
 809         frames-to-delete)
 810     (mapcar (function
 811              (lambda (frame)
 812                (let ((parameters (assq frame config-alist)))
 813                  (if parameters
 814                      (progn
 815                        (modify-frame-parameters
 816                         frame
 817                         ;; Since we can't set a frame's minibuffer status,
 818                         ;; we might as well omit the parameter altogether.
 819                         (let* ((parms (nth 1 parameters))
 820                                (mini (assq 'minibuffer parms)))
 821                           (if mini (setq parms (delq mini parms)))
 822                           parms))
 823                        (set-window-configuration (nth 2 parameters)))
 824                    (setq frames-to-delete (cons frame frames-to-delete))))))
 825             (frame-list))
 826     (if nodelete
 827         ;; Note: making frames invisible here was tried
 828         ;; but led to some strange behavior--each time the frame
 829         ;; was made visible again, the window manager asked afresh
 830         ;; for where to put it.
 831         (mapcar 'iconify-frame frames-to-delete)
 832       (mapcar 'delete-frame frames-to-delete))))
 833 \f
 834 ;;;; Convenience functions for accessing and interactively changing
 835 ;;;; frame parameters.
 836
 837 (defun frame-height (&optional frame)
 838   "Return number of lines available for display on FRAME.
 839 If FRAME is omitted, describe the currently selected frame."
 840   (cdr (assq 'height (frame-parameters frame))))
 841
 842 (defun frame-width (&optional frame)
 843   "Return number of columns available for display on FRAME.
 844 If FRAME is omitted, describe the currently selected frame."
 845   (cdr (assq 'width (frame-parameters frame))))
 846
 847 (defalias 'set-default-font 'set-frame-font)
 848 (defun set-frame-font (font-name &optional keep-size)
 849   "Set the font of the selected frame to FONT-NAME.
 850 When called interactively, prompt for the name of the font to use.
 851 To get the frame's current default font, use `frame-parameters'.
 852
 853 The default behavior is to keep the numbers of lines and columns in
 854 the frame, thus may change its pixel size. If optional KEEP-SIZE is
 855 non-nil (interactively, prefix argument) the current frame size (in
 856 pixels) is kept by adjusting the numbers of the lines and columns."
 857   (interactive
 858    (let* ((completion-ignore-case t)
 859           (font (completing-read "Font name: "
 860                          (mapcar #'list
 861                                  ;; x-list-fonts will fail with an error
 862                                  ;; if this frame doesn't support fonts.
 863                                  (x-list-fonts "*" nil (selected-frame)))
 864                          nil nil nil nil
 865                          (frame-parameter nil 'font))))
 866      (list font current-prefix-arg)))
 867   (let (fht fwd)
 868     (if keep-size
 869         (setq fht (* (frame-parameter nil 'height) (frame-char-height))
 870               fwd (* (frame-parameter nil 'width)  (frame-char-width))))
 871     (modify-frame-parameters (selected-frame)
 872                              (list (cons 'font font-name)))
 873     (if keep-size
 874         (modify-frame-parameters
 875          (selected-frame)
 876          (list (cons 'height (round fht (frame-char-height)))
 877                (cons 'width (round fwd (frame-char-width)))))))
 878   (run-hooks 'after-setting-font-hook 'after-setting-font-hooks))
 879
 880 (defun set-frame-parameter (frame parameter value)
 881   (modify-frame-parameters frame (list (cons parameter value))))
 882
 883 (defun set-background-color (color-name)
 884   "Set the background color of the selected frame to COLOR-NAME.
 885 When called interactively, prompt for the name of the color to use.
 886 To get the frame's current background color, use `frame-parameters'."
 887   (interactive (list (facemenu-read-color)))
 888   (modify-frame-parameters (selected-frame)
 889                            (list (cons 'background-color color-name)))
 890   (or window-system
 891       (face-set-after-frame-default (selected-frame))))
 892
 893 (defun set-foreground-color (color-name)
 894   "Set the foreground color of the selected frame to COLOR-NAME.
 895 When called interactively, prompt for the name of the color to use.
 896 To get the frame's current foreground color, use `frame-parameters'."
 897   (interactive (list (facemenu-read-color)))
 898   (modify-frame-parameters (selected-frame)
 899                            (list (cons 'foreground-color color-name)))
 900   (or window-system
 901       (face-set-after-frame-default (selected-frame))))
 902
 903 (defun set-cursor-color (color-name)
 904   "Set the text cursor color of the selected frame to COLOR-NAME.
 905 When called interactively, prompt for the name of the color to use.
 906 To get the frame's current cursor color, use `frame-parameters'."
 907   (interactive (list (facemenu-read-color)))
 908   (modify-frame-parameters (selected-frame)
 909                            (list (cons 'cursor-color color-name))))
 910
 911 (defun set-mouse-color (color-name)
 912   "Set the color of the mouse pointer of the selected frame to COLOR-NAME.
 913 When called interactively, prompt for the name of the color to use.
 914 To get the frame's current mouse color, use `frame-parameters'."
 915   (interactive (list (facemenu-read-color)))
 916   (modify-frame-parameters (selected-frame)
 917                            (list (cons 'mouse-color
 918                                        (or color-name
 919                                            (cdr (assq 'mouse-color
 920                                                       (frame-parameters))))))))
 921
 922 (defun set-border-color (color-name)
 923   "Set the color of the border of the selected frame to COLOR-NAME.
 924 When called interactively, prompt for the name of the color to use.
 925 To get the frame's current border color, use `frame-parameters'."
 926   (interactive (list (facemenu-read-color)))
 927   (modify-frame-parameters (selected-frame)
 928                            (list (cons 'border-color color-name))))
 929
 930 (defun auto-raise-mode (arg)
 931   "Toggle whether or not the selected frame should auto-raise.
 932 With arg, turn auto-raise mode on if and only if arg is positive.
 933 Note that this controls Emacs's own auto-raise feature.
 934 Some window managers allow you to enable auto-raise for certain windows.
 935 You can use that for Emacs windows if you wish, but if you do,
 936 that is beyond the control of Emacs and this command has no effect on it."
 937   (interactive "P")
 938   (if (null arg)
 939       (setq arg
 940             (if (cdr (assq 'auto-raise (frame-parameters (selected-frame))))
 941                 -1 1)))
 942   (if (> arg 0)
 943       (raise-frame (selected-frame)))
 944   (modify-frame-parameters (selected-frame)
 945                            (list (cons 'auto-raise (> arg 0)))))
 946
 947 (defun auto-lower-mode (arg)
 948   "Toggle whether or not the selected frame should auto-lower.
 949 With arg, turn auto-lower mode on if and only if arg is positive.
 950 Note that this controls Emacs's own auto-lower feature.
 951 Some window managers allow you to enable auto-lower for certain windows.
 952 You can use that for Emacs windows if you wish, but if you do,
 953 that is beyond the control of Emacs and this command has no effect on it."
 954   (interactive "P")
 955   (if (null arg)
 956       (setq arg
 957             (if (cdr (assq 'auto-lower (frame-parameters (selected-frame))))
 958                 -1 1)))
 959   (modify-frame-parameters (selected-frame)
 960                            (list (cons 'auto-lower (> arg 0)))))
 961 (defun set-frame-name (name)
 962   "Set the name of the selected frame to NAME.
 963 When called interactively, prompt for the name of the frame.
 964 The frame name is displayed on the modeline if the terminal displays only
 965 one frame, otherwise the name is displayed on the frame's caption bar."
 966   (interactive "sFrame name: ")
 967   (modify-frame-parameters (selected-frame)
 968                            (list (cons 'name name))))
 969
 970 (defun frame-current-scroll-bars (&optional frame)
 971   "Return the current scroll-bar settings in frame FRAME.
 972 Value is a cons (VERTICAL . HORIZ0NTAL) where VERTICAL specifies the
 973 current location of the vertical scroll-bars (left, right, or nil),
 974 and HORIZONTAL specifies the current location of the horizontal scroll
 975 bars (top, bottom, or nil)."
 976   (let ((vert (frame-parameter frame 'vertical-scroll-bars))
 977         (hor nil))
 978     (unless (memq vert '(left right nil))
 979       (setq vert default-frame-scroll-bars))
 980     (cons vert hor)))
 981 \f
 982 ;;;; Frame/display capabilities.
 983 (defun display-mouse-p (&optional display)
 984   "Return non-nil if DISPLAY has a mouse available.
 985 DISPLAY can be a display name, a frame, or nil (meaning the selected
 986 frame's display)."
 987   (let ((frame-type (framep-on-display display)))
 988     (cond
 989      ((eq frame-type 'pc)
 990       (msdos-mouse-p))
 991      ((eq system-type 'windows-nt)
 992       (with-no-warnings
 993        (> w32-num-mouse-buttons 0)))
 994      ((memq frame-type '(x mac))
 995       t)    ;; We assume X and Mac *always* have a pointing device
 996      (t
 997       (or (and (featurep 'xt-mouse)
 998                xterm-mouse-mode)
 999           ;; t-mouse is distributed with the GPM package.  It doesn't have
1000           ;; a toggle.
1001           (featurep 't-mouse))))))
1002
1003 (defun display-popup-menus-p (&optional display)
1004   "Return non-nil if popup menus are supported on DISPLAY.
1005 DISPLAY can be a display name, a frame, or nil (meaning the selected
1006 frame's display).
1007 Support for popup menus requires that the mouse be available."
1008   (and
1009    (let ((frame-type (framep-on-display display)))
1010      (memq frame-type '(x w32 pc mac)))
1011    (display-mouse-p display)))
1012
1013 (defun display-graphic-p (&optional display)
1014   "Return non-nil if DISPLAY is a graphic display.
1015 Graphical displays are those which are capable of displaying several
1016 frames and several different fonts at once.  This is true for displays
1017 that use a window system such as X, and false for text-only terminals.
1018 DISPLAY can be a display name, a frame, or nil (meaning the selected
1019 frame's display)."
1020   (not (null (memq (framep-on-display display) '(x w32 mac)))))
1021
1022 (defun display-images-p (&optional display)
1023   "Return non-nil if DISPLAY can display images.
1024
1025 DISPLAY can be a display name, a frame, or nil (meaning the selected
1026 frame's display)."
1027   (and (display-graphic-p display)
1028        (fboundp 'image-mask-p)
1029        (fboundp 'image-size)))
1030
1031 (defalias 'display-multi-frame-p 'display-graphic-p)
1032 (defalias 'display-multi-font-p 'display-graphic-p)
1033
1034 (defun display-selections-p (&optional display)
1035   "Return non-nil if DISPLAY supports selections.
1036 A selection is a way to transfer text or other data between programs
1037 via special system buffers called `selection' or `cut buffer' or
1038 `clipboard'.
1039 DISPLAY can be a display name, a frame, or nil (meaning the selected
1040 frame's display)."
1041   (let ((frame-type (framep-on-display display)))
1042     (cond
1043      ((eq frame-type 'pc)
1044       ;; MS-DOG frames support selections when Emacs runs inside
1045       ;; the Windows' DOS Box.
1046       (with-no-warnings
1047        (not (null dos-windows-version))))
1048      ((memq frame-type '(x w32 mac))
1049       t)    ;; FIXME?
1050      (t
1051       nil))))
1052
1053 (defun display-screens (&optional display)
1054   "Return the number of screens associated with DISPLAY."
1055   (let ((frame-type (framep-on-display display)))
1056     (cond
1057      ((memq frame-type '(x w32))
1058       (x-display-screens display))
1059      (t ;; FIXME: is this correct for the Mac?
1060       1))))
1061
1062 (defun display-pixel-height (&optional display)
1063   "Return the height of DISPLAY's screen in pixels.
1064 For character terminals, each character counts as a single pixel."
1065   (let ((frame-type (framep-on-display display)))
1066     (cond
1067      ((memq frame-type '(x w32 mac))
1068       (x-display-pixel-height display))
1069      (t
1070       (frame-height (if (framep display) display (selected-frame)))))))
1071
1072 (defun display-pixel-width (&optional display)
1073   "Return the width of DISPLAY's screen in pixels.
1074 For character terminals, each character counts as a single pixel."
1075   (let ((frame-type (framep-on-display display)))
1076     (cond
1077      ((memq frame-type '(x w32 mac))
1078       (x-display-pixel-width display))
1079      (t
1080       (frame-width (if (framep display) display (selected-frame)))))))
1081
1082 (defun display-mm-height (&optional display)
1083   "Return the height of DISPLAY's screen in millimeters.
1084 If the information is unavailable, value is nil."
1085   (and (memq (framep-on-display display) '(x w32 mac))
1086        (x-display-mm-height display)))
1087
1088 (defun display-mm-width (&optional display)
1089   "Return the width of DISPLAY's screen in millimeters.
1090 If the information is unavailable, value is nil."
1091   (and (memq (framep-on-display display) '(x w32 mac))
1092        (x-display-mm-width display)))
1093
1094 (defun display-backing-store (&optional display)
1095   "Return the backing store capability of DISPLAY's screen.
1096 The value may be `always', `when-mapped', `not-useful', or nil if
1097 the question is inapplicable to a certain kind of display."
1098   (let ((frame-type (framep-on-display display)))
1099     (cond
1100      ((memq frame-type '(x w32 mac))
1101       (x-display-backing-store display))
1102      (t
1103       'not-useful))))
1104
1105 (defun display-save-under (&optional display)
1106   "Return non-nil if DISPLAY's screen supports the SaveUnder feature."
1107   (let ((frame-type (framep-on-display display)))
1108     (cond
1109      ((memq frame-type '(x w32 mac))
1110       (x-display-save-under display))
1111      (t
1112       'not-useful))))
1113
1114 (defun display-planes (&optional display)
1115   "Return the number of planes supported by DISPLAY."
1116   (let ((frame-type (framep-on-display display)))
1117     (cond
1118      ((memq frame-type '(x w32 mac))
1119       (x-display-planes display))
1120      ((eq frame-type 'pc)
1121       4)
1122      (t
1123       (truncate (log (length (tty-color-alist)) 2))))))
1124
1125 (defun display-color-cells (&optional display)
1126   "Return the number of color cells supported by DISPLAY."
1127   (let ((frame-type (framep-on-display display)))
1128     (cond
1129      ((memq frame-type '(x w32 mac))
1130       (x-display-color-cells display))
1131      ((eq frame-type 'pc)
1132       16)
1133      (t
1134       (tty-display-color-cells)))))
1135
1136 (defun display-visual-class (&optional display)
1137   "Returns the visual class of DISPLAY.
1138 The value is one of the symbols `static-gray', `gray-scale',
1139 `static-color', `pseudo-color', `true-color', or `direct-color'."
1140   (let ((frame-type (framep-on-display display)))
1141     (cond
1142      ((memq frame-type '(x w32 mac))
1143       (x-display-visual-class display))
1144      ((and (memq frame-type '(pc t))
1145            (tty-display-color-p display))
1146       'static-color)
1147      (t
1148       'static-gray))))
1149
1150 \f
1151 ;;;; Aliases for backward compatibility with Emacs 18.
1152 (defalias 'screen-height 'frame-height)
1153 (defalias 'screen-width 'frame-width)
1154
1155 (defun set-screen-width (cols &optional pretend)
1156   "Obsolete function to change the size of the screen to COLS columns.
1157 Optional second arg non-nil means that redisplay should use COLS columns
1158 but that the idea of the actual width of the frame should not be changed.
1159 This function is provided only for compatibility with Emacs 18; new code
1160 should use `set-frame-width instead'."
1161   (set-frame-width (selected-frame) cols pretend))
1162
1163 (defun set-screen-height (lines &optional pretend)
1164   "Obsolete function to change the height of the screen to LINES lines.
1165 Optional second arg non-nil means that redisplay should use LINES lines
1166 but that the idea of the actual height of the screen should not be changed.
1167 This function is provided only for compatibility with Emacs 18; new code
1168 should use `set-frame-height' instead."
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 'screen-height 'frame-height) ;before 19.15
1192 (make-obsolete 'screen-width  'frame-width) ;before 19.15
1193 (make-obsolete 'set-screen-width 'set-frame-width) ;before 19.15
1194 (make-obsolete 'set-screen-height 'set-frame-height) ;before 19.15
1195
1196 ;; miscellaneous obsolescence declarations
1197 (defvaralias 'delete-frame-hook 'delete-frame-functions)
1198 (make-obsolete-variable 'delete-frame-hook 'delete-frame-functions "22.1")
1199
1200 \f
1201 ;; Highlighting trailing whitespace.
1202
1203 (make-variable-buffer-local 'show-trailing-whitespace)
1204
1205 (defcustom show-trailing-whitespace nil
1206   "*Non-nil means highlight trailing whitespace.
1207 This is done in the face `trailing-whitespace'."
1208   :tag "Highlight trailing whitespace."
1209   :type 'boolean
1210   :group 'whitespace-faces)
1211
1212
1213 \f
1214 ;; Scrolling
1215
1216 (defgroup scrolling nil
1217   "Scrolling windows."
1218   :version "21.1"
1219   :group 'frames)
1220
1221 (defcustom auto-hscroll-mode t
1222   "*Allow or disallow automatic scrolling windows horizontally.
1223 If non-nil, windows are automatically scrolled horizontally to make
1224 point visible."
1225   :version "21.1"
1226   :type 'boolean
1227   :group 'scrolling)
1228 (defvaralias 'automatic-hscrolling 'auto-hscroll-mode)
1229
1230 \f
1231 ;; Blinking cursor
1232
1233 (defgroup cursor nil
1234   "Displaying text cursors."
1235   :version "21.1"
1236   :group 'frames)
1237
1238 (defcustom blink-cursor-delay 0.5
1239   "*Seconds of idle time after which cursor starts to blink."
1240   :tag "Delay in seconds."
1241   :type 'number
1242   :group 'cursor)
1243
1244 (defcustom blink-cursor-interval 0.5
1245   "*Length of cursor blink interval in seconds."
1246   :tag "Blink interval in seconds."
1247   :type 'number
1248   :group 'cursor)
1249
1250 (defvar blink-cursor-idle-timer nil
1251   "Timer started after `blink-cursor-delay' seconds of Emacs idle time.
1252 The function `blink-cursor-start' is called when the timer fires.")
1253
1254 (defvar blink-cursor-timer nil
1255   "Timer started from `blink-cursor-start'.
1256 This timer calls `blink-cursor-timer-function' every
1257 `blink-cursor-interval' seconds.")
1258
1259 ;; We do not know the standard _evaluated_ value yet, because the standard
1260 ;; expression uses values that are not yet set.  The correct evaluated
1261 ;; standard value will be installed in startup.el using exactly the same
1262 ;; expression as in the defcustom.
1263 (define-minor-mode blink-cursor-mode
1264   "Toggle blinking cursor mode.
1265 With a numeric argument, turn blinking cursor mode on iff ARG is positive.
1266 When blinking cursor mode is enabled, the cursor of the selected
1267 window blinks.
1268
1269 Note that this command is effective only when Emacs
1270 displays through a window system, because then Emacs does its own
1271 cursor display.  On a text-only terminal, this is not implemented."
1272   :init-value (not (or noninteractive
1273                        (if (boundp 'no-blinking-cursor) no-blinking-cursor)
1274                        (eq system-type 'ms-dos)
1275                        (not (memq window-system '(x w32)))))
1276   :group 'cursor
1277   :global t
1278   (if blink-cursor-idle-timer (cancel-timer blink-cursor-idle-timer))
1279   (if blink-cursor-timer (cancel-timer blink-cursor-timer))
1280   (setq blink-cursor-idle-timer nil
1281         blink-cursor-timer nil)
1282   (if blink-cursor-mode
1283       (progn
1284         ;; Hide the cursor.
1285         ;;(internal-show-cursor nil nil)
1286         (setq blink-cursor-idle-timer
1287               (run-with-idle-timer blink-cursor-delay
1288                                    blink-cursor-delay
1289                                    'blink-cursor-start)))
1290     (internal-show-cursor nil t)))
1291
1292 (defvaralias 'blink-cursor 'blink-cursor-mode)
1293 (make-obsolete-variable 'blink-cursor 'blink-cursor-mode "22.1")
1294
1295 (defun blink-cursor-start ()
1296   "Timer function called from the timer `blink-cursor-idle-timer'.
1297 This starts the timer `blink-cursor-timer', which makes the cursor blink
1298 if appropriate.  It also arranges to cancel that timer when the next
1299 command starts, by installing a pre-command hook."
1300   (when (null blink-cursor-timer)
1301     (add-hook 'pre-command-hook 'blink-cursor-end)
1302     (internal-show-cursor nil nil)
1303     (setq blink-cursor-timer
1304           (run-with-timer blink-cursor-interval blink-cursor-interval
1305                           'blink-cursor-timer-function))))
1306
1307 (defun blink-cursor-timer-function ()
1308   "Timer function of timer `blink-cursor-timer'."
1309   (internal-show-cursor nil (not (internal-show-cursor-p))))
1310
1311 (defun blink-cursor-end ()
1312   "Stop cursor blinking.
1313 This is installed as a pre-command hook by `blink-cursor-start'.
1314 When run, it cancels the timer `blink-cursor-timer' and removes
1315 itself as a pre-command hook."
1316   (remove-hook 'pre-command-hook 'blink-cursor-end)
1317   (internal-show-cursor nil t)
1318   (cancel-timer blink-cursor-timer)
1319   (setq blink-cursor-timer nil))
1320
1321
1322 \f
1323 ;; Hourglass pointer
1324
1325 (defcustom display-hourglass t
1326   "*Non-nil means show an hourglass pointer when running under a window system."
1327   :tag "Hourglass pointer"
1328   :type 'boolean
1329   :group 'cursor)
1330
1331 (defcustom hourglass-delay 1
1332   "*Seconds to wait before displaying an hourglass pointer."
1333   :tag "Hourglass delay"
1334   :type 'number
1335   :group 'cursor)
1336
1337 \f
1338 (defcustom cursor-in-non-selected-windows t
1339   "*Non-nil means show a hollow box cursor in non-selected-windows.
1340 If nil, don't show a cursor except in the selected window.
1341 Use Custom to set this variable to get the display updated."
1342   :tag "Cursor in non-selected windows"
1343   :type 'boolean
1344   :group 'cursor
1345   :set #'(lambda (symbol value)
1346            (set-default symbol value)
1347            (force-mode-line-update t)))
1348
1349 \f
1350 ;;;; Key bindings
1351
1352 (define-key ctl-x-5-map "2" 'make-frame-command)
1353 (define-key ctl-x-5-map "1" 'delete-other-frames)
1354 (define-key ctl-x-5-map "0" 'delete-frame)
1355 (define-key ctl-x-5-map "o" 'other-frame)
1356
1357 (provide 'frame)
1358
1359 ;; arch-tag: 82979c70-b8f2-4306-b2ad-ddbd6b328b56
1360 ;;; frame.el ends here