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- ;;; frame.el --- multi-frame management independent of window systems.
-
- ;;;; Copyright (C) 1993 Free Software Foundation, Inc.
-
- ;; Maintainer: FSF
- ;; Keywords: internal
-
- ;;; This file is part of GNU Emacs.
- ;;;
- ;;; GNU Emacs is free software; you can redistribute it and/or modify
- ;;; it under the terms of the GNU General Public License as published by
- ;;; the Free Software Foundation; either version 2, or (at your option)
- ;;; any later version.
- ;;;
- ;;; GNU Emacs is distributed in the hope that it will be useful,
- ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
- ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- ;;; GNU General Public License for more details.
- ;;;
- ;;; You should have received a copy of the GNU General Public License
- ;;; along with GNU Emacs; see the file COPYING. If not, write to
- ;;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
- ;;; Code:
-
- (defvar frame-creation-function nil
- "Window-system dependent function to call to create a new frame.
- The window system startup file should set this to its frame creation
- function, which should take an alist of parameters as its argument.")
-
- ;;; The initial value given here for this must ask for a minibuffer.
- ;;; There must always exist a frame with a minibuffer, and after we
- ;;; delete the terminal frame, this will be the only frame.
- (defvar initial-frame-alist '((minibuffer . t))
- "Alist of frame parameters for creating the initial X window frame.
- You can set this in your `.emacs' file; for example,
- (setq initial-frame-alist '((top . 1) (left . 1) (width . 80) (height . 55)))
- If the value calls for a frame without a minibuffer, and you do not create a
- minibuffer frame on your own, one is created according to
- `minibuffer-frame-alist'.
- Parameters specified here supersede the values given in
- `default-frame-alist'.")
-
- (defvar minibuffer-frame-alist '((width . 80) (height . 2))
- "Alist of frame parameters for initially creating a minibuffer frame.
- You can set this in your `.emacs' file; for example,
- (setq minibuffer-frame-alist
- '((top . 1) (left . 1) (width . 80) (height . 2)))
- Parameters specified here supersede the values given in
- `default-frame-alist'.")
-
- (defvar pop-up-frame-alist nil
- "Alist of frame parameters used when creating pop-up frames.
- Pop-up frames are used for completions, help, and the like.
- This variable can be set in your init file, like this:
- (setq pop-up-frame-alist '((width . 80) (height . 20)))
- These supersede the values given in `default-frame-alist'.")
-
- (setq pop-up-frame-function
- (function (lambda ()
- (new-frame pop-up-frame-alist))))
-
-
- ;;;; Arrangement of frames at startup
-
- ;;; 1) Load the window system startup file from the lisp library and read the
- ;;; high-priority arguments (-q and the like). The window system startup
- ;;; file should create any frames specified in the window system defaults.
- ;;;
- ;;; 2) If no frames have been opened, we open an initial text frame.
- ;;;
- ;;; 3) Once the init file is done, we apply any newly set parameters
- ;;; in initial-frame-alist to the frame.
-
- ;; These are now called explicitly at the proper times,
- ;; since that is easier to understand.
- ;; Actually using hooks within Emacs is bad for future maintenance. --rms.
- ;; (add-hook 'before-init-hook 'frame-initialize)
- ;; (add-hook 'window-setup-hook 'frame-notice-user-settings)
-
- ;;; If we create the initial frame, this is it.
- (defvar frame-initial-frame nil)
-
- ;;; startup.el calls this function before loading the user's init
- ;;; file - if there is no frame with a minibuffer open now, create
- ;;; one to display messages while loading the init file.
- (defun frame-initialize ()
-
- ;; Are we actually running under a window system at all?
- (if (and window-system (not noninteractive))
- (progn
- ;; If there is no frame with a minibuffer besides the terminal
- ;; frame, then we need to create the opening frame. Make sure
- ;; it has a minibuffer, but let initial-frame-alist omit the
- ;; minibuffer spec.
- (or (delq terminal-frame (minibuffer-frame-list))
- (progn
- (setq default-minibuffer-frame
- (setq frame-initial-frame
- (new-frame initial-frame-alist)))
- ;; Delete any specifications for window geometry parameters
- ;; so that we won't reapply them in frame-notice-user-settings.
- ;; It would be wrong to reapply them then,
- ;; because that would override explicit user resizing.
- (setq initial-frame-alist
- (frame-remove-geometry-params initial-frame-alist))
- ;; Handle `reverse' as a parameter.
- (if (cdr (or (assq 'reverse initial-frame-alist)
- (assq 'reverse default-frame-alist)))
- (let ((params (frame-parameters frame-initial-frame)))
- (modify-frame-parameters
- frame-initial-frame
- ;; Must set cursor-color after background color.
- ;; So put it first.
- (list (cons 'cursor-color
- (cdr (assq 'background-color params)))
- (cons 'foreground-color
- (cdr (assq 'background-color params)))
- (cons 'background-color
- (cdr (assq 'foreground-color params)))
- (cons 'mouse-color
- (cdr (assq 'background-color params)))
- (cons 'border-color
- (cdr (assq 'background-color params)))))))))
-
- ;; At this point, we know that we have a frame open, so we
- ;; can delete the terminal frame.
- (delete-frame terminal-frame)
- (setq terminal-frame nil))
-
- ;; No, we're not running a window system. Arrange to cause errors.
- (setq frame-creation-function
- (function
- (lambda (parameters)
- (error
- "Can't create multiple frames without a window system"))))))
-
- ;;; startup.el calls this function after loading the user's init
- ;;; file. Now default-frame-alist and initial-frame-alist contain
- ;;; information to which we must react; do what needs to be done.
- (defun frame-notice-user-settings ()
-
- ;; Creating and deleting frames may shift the selected frame around,
- ;; and thus the current buffer. Protect against that. We don't
- ;; want to use save-excursion here, because that may also try to set
- ;; the buffer of the selected window, which fails when the selected
- ;; window is the minibuffer.
- (let ((old-buffer (current-buffer)))
-
- ;; If the initial frame is still around, apply initial-frame-alist
- ;; and default-frame-alist to it.
- (if (frame-live-p frame-initial-frame)
-
- ;; The initial frame we create above always has a minibuffer.
- ;; If the user wants to remove it, or make it a minibuffer-only
- ;; frame, then we'll have to delete the current frame and make a
- ;; new one; you can't remove or add a root window to/from an
- ;; existing frame.
- ;;
- ;; NOTE: default-frame-alist was nil when we created the
- ;; existing frame. We need to explicitly include
- ;; default-frame-alist in the parameters of the screen we
- ;; create here, so that its new value, gleaned from the user's
- ;; .emacs file, will be applied to the existing screen.
- (if (not (eq (cdr (or (assq 'minibuffer initial-frame-alist)
- (assq 'minibuffer default-frame-alist)
- '(minibuffer . t)))
- t))
- ;; Create the new frame.
- (let ((new
- (new-frame
- (append initial-frame-alist
- default-frame-alist
- (frame-parameters frame-initial-frame)))))
-
- ;; The initial frame, which we are about to delete, may be
- ;; the only frame with a minibuffer. If it is, create a
- ;; new one.
- (or (delq frame-initial-frame (minibuffer-frame-list))
- (new-frame (append minibuffer-frame-alist
- '((minibuffer . only)))))
-
- ;; If the initial frame is serving as a surrogate
- ;; minibuffer frame for any frames, we need to wean them
- ;; onto a new frame. The default-minibuffer-frame
- ;; variable must be handled similarly.
- (let ((users-of-initial
- (filtered-frame-list
- (function (lambda (frame)
- (and (not (eq frame frame-initial-frame))
- (eq (window-frame
- (minibuffer-window frame))
- frame-initial-frame)))))))
- (if (or users-of-initial
- (eq default-minibuffer-frame frame-initial-frame))
-
- ;; Choose an appropriate frame. Prefer frames which
- ;; are only minibuffers.
- (let* ((new-surrogate
- (car
- (or (filtered-frame-list
- (function
- (lambda (frame)
- (eq (cdr (assq 'minibuffer
- (frame-parameters frame)))
- 'only))))
- (minibuffer-frame-list))))
- (new-minibuffer (minibuffer-window new-surrogate)))
-
- (if (eq default-minibuffer-frame frame-initial-frame)
- (setq default-minibuffer-frame new-surrogate))
-
- ;; Wean the frames using frame-initial-frame as
- ;; their minibuffer frame.
- (mapcar
- (function
- (lambda (frame)
- (modify-frame-parameters
- frame (list (cons 'minibuffer new-minibuffer)))))
- users-of-initial))))
-
- ;; Redirect events enqueued at this frame to the new frame.
- ;; Is this a good idea?
- (redirect-frame-focus frame-initial-frame new)
-
- ;; Finally, get rid of the old frame.
- (delete-frame frame-initial-frame))
-
- ;; Otherwise, we don't need all that rigamarole; just apply
- ;; the new parameters.
- (modify-frame-parameters frame-initial-frame
- (append initial-frame-alist
- default-frame-alist))))
-
- ;; Restore the original buffer.
- (set-buffer old-buffer)
-
- ;; Make sure the initial frame can be GC'd if it is ever deleted.
- ;; Make sure frame-notice-user-settings does nothing if called twice.
- (setq frame-initial-frame nil)))
-
-
- ;;;; Creation of additional frames, and other frame miscellanea
-
- ;;; Return some frame other than the current frame, creating one if
- ;;; necessary. Note that the minibuffer frame, if separate, is not
- ;;; considered (see next-frame).
- (defun get-other-frame ()
- (let ((s (if (equal (next-frame (selected-frame)) (selected-frame))
- (new-frame)
- (next-frame (selected-frame)))))
- s))
-
- (defun next-multiframe-window ()
- "Select the next window, regardless of which frame it is on."
- (interactive)
- (select-window (next-window (selected-window)
- (> (minibuffer-depth) 0)
- t)))
-
- (defun previous-multiframe-window ()
- "Select the previous window, regardless of which frame it is on."
- (interactive)
- (select-window (previous-window (selected-window)
- (> (minibuffer-depth) 0)
- t)))
-
- ;; Alias, kept temporarily.
- (defalias 'new-frame 'make-frame)
- (defun make-frame (&optional parameters)
- "Create a new frame, displaying the current buffer.
-
- Optional argument PARAMETERS is an alist of parameters for the new
- frame. Specifically, PARAMETERS is a list of pairs, each having one
- of the following forms:
-
- \(name . STRING) - The frame should be named STRING.
-
- \(height . NUMBER) - The frame should be NUMBER text lines high. If
- this parameter is present, the width parameter must also be
- given.
-
- \(width . NUMBER) - The frame should be NUMBER characters in width.
- If this parameter is present, the height parameter must also
- be given.
-
- \(minibuffer . t) - the frame should have a minibuffer
- \(minibuffer . nil) - the frame should have no minibuffer
- \(minibuffer . only) - the frame should contain only a minibuffer
- \(minibuffer . WINDOW) - the frame should use WINDOW as its minibuffer window.
-
- The documentation for the function `x-create-frame' describes
- additional frame parameters that Emacs recognizes for X window frames."
- (interactive)
- (funcall frame-creation-function parameters))
-
- (defun filtered-frame-list (predicate)
- "Return a list of all live frames which satisfy PREDICATE."
- (let ((frames (frame-list))
- good-frames)
- (while (consp frames)
- (if (funcall predicate (car frames))
- (setq good-frames (cons (car frames) good-frames)))
- (setq frames (cdr frames)))
- good-frames))
-
- (defun minibuffer-frame-list ()
- "Return a list of all frames with their own minibuffers."
- (filtered-frame-list
- (function (lambda (frame)
- (eq frame (window-frame (minibuffer-window frame)))))))
-
- (defun frame-remove-geometry-params (param-list)
- "Return the parameter list PARAM-LIST, but with geometry specs removed.
- This deletes all bindings in PARAM-LIST for `top', `left', `width',
- and `height' parameters.
- Emacs uses this to avoid overriding explicit moves and resizings from
- the user during startup."
- (setq param-list (cons nil param-list))
- (let ((tail param-list))
- (while (consp (cdr tail))
- (if (and (consp (car (cdr tail)))
- (memq (car (car (cdr tail))) '(height width top left)))
- (setcdr tail (cdr (cdr tail)))
- (setq tail (cdr tail)))))
- (cdr param-list))
-
-
-
- ;;;; Frame configurations
-
- (defun current-frame-configuration ()
- "Return a list describing the positions and states of all frames.
- Its car is `frame-configuration'.
- Each element of the cdr is a list of the form (FRAME ALIST WINDOW-CONFIG),
- where
- FRAME is a frame object,
- ALIST is an association list specifying some of FRAME's parameters, and
- WINDOW-CONFIG is a window configuration object for FRAME."
- (cons 'frame-configuration
- (mapcar (function
- (lambda (frame)
- (list frame
- (frame-parameters frame)
- (current-window-configuration frame))))
- (frame-list))))
-
- (defun set-frame-configuration (configuration)
- "Restore the frames to the state described by CONFIGURATION.
- Each frame listed in CONFIGURATION has its position, size, window
- configuration, and other parameters set as specified in CONFIGURATION."
- (or (frame-configuration-p configuration)
- (signal 'wrong-type-argument
- (list 'frame-configuration-p configuration)))
- (let ((config-alist (cdr configuration))
- frames-to-delete)
- (mapcar (function
- (lambda (frame)
- (let ((parameters (assq frame config-alist)))
- (if parameters
- (progn
- (modify-frame-parameters
- frame
- ;; Since we can't set a frame's minibuffer status,
- ;; we might as well omit the parameter altogether.
- (let* ((parms (nth 1 parameters))
- (mini (assq 'minibuffer parms)))
- (if mini (setq parms (delq mini parms)))
- parms))
- (set-window-configuration (nth 2 parameters)))
- (setq frames-to-delete (cons frame frames-to-delete))))))
- (frame-list))
- (mapcar 'delete-frame frames-to-delete)))
-
- (defun frame-configuration-p (object)
- "Return non-nil if OBJECT seems to be a frame configuration.
- Any list whose car is `frame-configuration' is assumed to be a frame
- configuration."
- (and (consp object)
- (eq (car object) 'frame-configuration)))
-
-
- ;;;; Convenience functions for accessing and interactively changing
- ;;;; frame parameters.
-
- (defun frame-height (&optional frame)
- "Return number of lines available for display on FRAME.
- If FRAME is omitted, describe the currently selected frame."
- (cdr (assq 'height (frame-parameters frame))))
-
- (defun frame-width (&optional frame)
- "Return number of columns available for display on FRAME.
- If FRAME is omitted, describe the currently selected frame."
- (cdr (assq 'width (frame-parameters frame))))
-
- (defun set-default-font (font-name)
- "Set the font of the selected frame to FONT.
- When called interactively, prompt for the name of the font to use."
- (interactive "sFont name: ")
- (modify-frame-parameters (selected-frame)
- (list (cons 'font font-name))))
-
- (defun set-background-color (color-name)
- "Set the background color of the selected frame to COLOR.
- When called interactively, prompt for the name of the color to use."
- (interactive "sColor: ")
- (modify-frame-parameters (selected-frame)
- (list (cons 'background-color color-name))))
-
- (defun set-foreground-color (color-name)
- "Set the foreground color of the selected frame to COLOR.
- When called interactively, prompt for the name of the color to use."
- (interactive "sColor: ")
- (modify-frame-parameters (selected-frame)
- (list (cons 'foreground-color color-name))))
-
- (defun set-cursor-color (color-name)
- "Set the text cursor color of the selected frame to COLOR.
- When called interactively, prompt for the name of the color to use."
- (interactive "sColor: ")
- (modify-frame-parameters (selected-frame)
- (list (cons 'cursor-color color-name))))
-
- (defun set-mouse-color (color-name)
- "Set the color of the mouse pointer of the selected frame to COLOR.
- When called interactively, prompt for the name of the color to use."
- (interactive "sColor: ")
- (modify-frame-parameters (selected-frame)
- (list (cons 'mouse-color color-name))))
-
- (defun set-border-color (color-name)
- "Set the color of the border of the selected frame to COLOR.
- When called interactively, prompt for the name of the color to use."
- (interactive "sColor: ")
- (modify-frame-parameters (selected-frame)
- (list (cons 'border-color color-name))))
-
- (defun auto-raise-mode (arg)
- "Toggle whether or not the selected frame should auto-raise.
- With arg, turn auto-raise mode on if and only if arg is positive."
- (interactive "P")
- (if (null arg)
- (setq arg
- (if (cdr (assq 'auto-raise (frame-parameters (selected-frame))))
- -1 1)))
- (modify-frame-parameters (selected-frame)
- (list (cons 'auto-raise (> arg 0)))))
-
- (defun auto-lower-mode (arg)
- "Toggle whether or not the selected frame should auto-lower.
- With arg, turn auto-lower mode on if and only if arg is positive."
- (interactive "P")
- (if (null arg)
- (setq arg
- (if (cdr (assq 'auto-lower (frame-parameters (selected-frame))))
- -1 1)))
- (modify-frame-parameters (selected-frame)
- (list (cons 'auto-lower (> arg 0)))))
-
- (defun toggle-scroll-bar (arg)
- "Toggle whether or not the selected frame has vertical scroll bars.
- With arg, turn vertical scroll bars on if and only if arg is positive."
- (interactive "P")
- (if (null arg)
- (setq arg
- (if (cdr (assq 'vertical-scroll-bars
- (frame-parameters (selected-frame))))
- -1 1)))
- (modify-frame-parameters (selected-frame)
- (list (cons 'vertical-scroll-bars (> arg 0)))))
-
- (defun toggle-horizontal-scroll-bar (arg)
- "Toggle whether or not the selected frame has horizontal scroll bars.
- With arg, turn horizontal scroll bars on if and only if arg is positive.
- Horizontal scroll bars aren't implemented yet."
- (interactive "P")
- (error "Horizontal scroll bars aren't implemented yet"))
-
-
- ;;;; Aliases for backward compatibility with Emacs 18.
- (defalias 'screen-height 'frame-height)
- (defalias 'screen-width 'frame-width)
-
- (defun set-screen-width (cols &optional pretend)
- "Obsolete function to change the size of the screen to COLS columns.\n\
- Optional second arg non-nil means that redisplay should use COLS columns\n\
- but that the idea of the actual width of the frame should not be changed.\n\
- This function is provided only for compatibility with Emacs 18; new code\n\
- should use `set-frame-width instead'."
- (set-frame-width (selected-frame) cols pretend))
-
- (defun set-screen-height (lines &optional pretend)
- "Obsolete function to change the height of the screen to LINES lines.\n\
- Optional second arg non-nil means that redisplay should use LINES lines\n\
- but that the idea of the actual height of the screen should not be changed.\n\
- This function is provided only for compatibility with Emacs 18; new code\n\
- should use `set-frame-width' instead."
- (set-frame-height (selected-frame) lines pretend))
-
- (make-obsolete 'screen-height 'frame-height)
- (make-obsolete 'screen-width 'frame-width)
- (make-obsolete 'set-screen-width 'set-frame-width)
- (make-obsolete 'set-screen-height 'set-frame-height)
-
-
- ;;;; Key bindings
- (defvar ctl-x-5-map (make-sparse-keymap)
- "Keymap for frame commands.")
- (defalias 'ctl-x-5-prefix ctl-x-5-map)
- (define-key ctl-x-map "5" 'ctl-x-5-prefix)
-
- (define-key ctl-x-5-map "2" 'new-frame)
- (define-key ctl-x-5-map "0" 'delete-frame)
-
- (provide 'frame)
-
- ;;; frame.el ends here
-