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;;; frame.el --- multi-frame management independent of window systems.
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;;;; Copyright (C) 1993 Free Software Foundation, Inc.
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;; Maintainer: FSF
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;; Keywords: internal
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;;; 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
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;;; the Free Software Foundation; either version 2, or (at your option)
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;;; 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.

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;;; Code:

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(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
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function, which should take an alist of parameters as its argument.")

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;;; 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.
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(defvar initial-frame-alist '((minibuffer . t))
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  "Alist of frame parameters for creating the initial X window frame.
You can set this in your `.emacs' file; for example,
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 (setq initial-frame-alist '((top . 1) (left . 1) (width . 80) (height . 55)))
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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
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`minibuffer-frame-alist'.
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Parameters specified here supersede the values given in
`default-frame-alist'.")
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(defvar minibuffer-frame-alist '((width . 80) (height . 2))
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  "Alist of frame parameters for initially creating a minibuffer frame.
You can set this in your `.emacs' file; for example,
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 (setq minibuffer-frame-alist
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   '((top . 1) (left . 1) (width . 80) (height . 2)))
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Parameters specified here supersede the values given in
`default-frame-alist'.")
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(defvar pop-up-frame-alist nil
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  "Alist of frame parameters used when creating pop-up frames.
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Pop-up frames are used for completions, help, and the like.
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This variable can be set in your init file, like this:
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  (setq pop-up-frame-alist '((width . 80) (height . 20)))
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These supercede the values given in `default-frame-alist'.")
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(setq pop-up-frame-function
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      (function (lambda ()
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		  (new-frame pop-up-frame-alist))))
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;;;; Arrangement of frames at startup
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;;; 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
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;;; file should create any frames specified in the window system defaults.
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;;; 
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;;; 2) If no frames have been opened, we open an initial text frame.
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;;;
;;; 3) Once the init file is done, we apply any newly set parameters
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;;; in initial-frame-alist to the frame.
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(add-hook 'before-init-hook 'frame-initialize)
(add-hook 'window-setup-hook 'frame-notice-user-settings)
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;;; If we create the initial frame, this is it.
(defvar frame-initial-frame nil)
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;;; startup.el calls this function before loading the user's init
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;;; file - if there is no frame with a minibuffer open now, create
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;;; one to display messages while loading the init file.
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(defun frame-initialize ()
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  ;; Are we actually running under a window system at all?
  (if (and window-system (not noninteractive))
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      (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))
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	    (setq default-minibuffer-frame
		  (setq frame-initial-frame
			(new-frame initial-frame-alist))))
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	;; 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))
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    ;; No, we're not running a window system.  Arrange to cause errors.
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    (setq frame-creation-function
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	  (function
	   (lambda (parameters)
	     (error
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	      "Can't create multiple frames without a window system"))))))
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;;; 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.
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(defun frame-notice-user-settings ()
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  ;; 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.
	;;
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	;; 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.
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	(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))))
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	      ;; Redirect events enqueued at this frame to the new frame.
	      ;; Is this a good idea?
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	      (redirect-frame-focus frame-initial-frame new)
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	      ;; Finally, get rid of the old frame.
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	      (delete-frame frame-initial-frame))
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	  ;; Otherwise, we don't need all that rigamarole; just apply
	  ;; the new parameters.
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	  (modify-frame-parameters frame-initial-frame
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				   (append initial-frame-alist
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					   default-frame-alist))))
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    ;; Restore the original buffer.
    (set-buffer old-buffer)

    ;; Make sure the initial frame can be GC'd if it is ever deleted.
    (makunbound 'frame-initial-frame)))
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;;;; Creation of additional frames, and other frame miscellanea
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;;; Return some frame other than the current frame, creating one if
;;; neccessary.  Note that the minibuffer frame, if separate, is not
;;; considered (see next-frame).
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(defun get-other-frame ()
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  (let ((s (if (equal (next-frame (selected-frame)) (selected-frame))
	       (new-frame)
	     (next-frame (selected-frame)))))
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    s))

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(defun next-multiframe-window ()
  "Select the next window, regardless of which frame it is on."
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  (interactive)
  (select-window (next-window (selected-window)
			      (> (minibuffer-depth) 0)
			      t)))

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(defun previous-multiframe-window ()
  "Select the previous window, regardless of which frame it is on."
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  (interactive)
  (select-window (previous-window (selected-window)
				  (> (minibuffer-depth) 0)
				  t)))

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(defun new-frame (&optional parameters)
  "Create a new frame, displaying the current buffer.
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Optional argument PARAMETERS is an alist of parameters for the new
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frame.  Specifically, PARAMETERS is a list of pairs, each having one
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of the following forms:

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\(name . STRING)	- The frame should be named STRING.
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\(height . NUMBER) - The frame should be NUMBER text lines high.  If
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	this parameter is present, the width parameter must also be
	given.

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\(width . NUMBER) - The frame should be NUMBER characters in width.
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	If this parameter is present, the height parameter must also
	be given.

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\(minibuffer . t) - the frame should have a minibuffer
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\(minibuffer . nil) - the frame should have no minibuffer
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\(minibuffer . only) - the frame should contain only a minibuffer
\(minibuffer . WINDOW) - the frame should use WINDOW as its minibuffer window.
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The documentation for the function `x-create-frame' describes
additional frame parameters that Emacs recognizes for X window frames."
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  (interactive)
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  (funcall frame-creation-function parameters))
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(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)))))))

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;;;; Frame configurations

(defun current-frame-configuration ()
  "Return a list describing the positions and states of all frames.
Each element 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."
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  (mapcar (function
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	   (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
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configuration, and other parameters set as specified in CONFIGURATION."
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  (let (frames-to-delete)
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    (mapcar (function
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	     (lambda (frame)
	       (let ((parameters (assq frame configuration)))
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		 (if parameters
		     (progn
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		       (modify-frame-parameters frame (nth 1 parameters))
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		       (set-window-configuration (nth 2 parameters)))
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		   (setq frames-to-delete (cons frame frames-to-delete))))))
	    (frame-list))
    (mapcar 'delete-frame frames-to-delete)))
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;;;; Convenience functions for accessing and interactively changing
;;;; frame parameters.
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(defun frame-height (&optional frame)
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  "Return number of lines available for display on FRAME.
If FRAME is omitted, describe the currently selected frame."
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  (cdr (assq 'height (frame-parameters frame))))
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(defun frame-width (&optional frame)
  "Return number of columns available for display on FRAME.
If FRAME is omitted, describe the currently selected frame."
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  (cdr (assq 'width (frame-parameters frame))))
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(defun set-default-font (font-name)
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  "Set the font of the selected frame to FONT.
When called interactively, prompt for the name of the font to use."
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  (interactive "sFont name: ")
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  (modify-frame-parameters (selected-frame)
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			   (list (cons 'font font-name))))
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(defun set-background-color (color-name)
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  "Set the background color of the selected frame to COLOR.
When called interactively, prompt for the name of the color to use."
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  (interactive "sColor: ")
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  (modify-frame-parameters (selected-frame)
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			   (list (cons 'background-color color-name))))
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(defun set-foreground-color (color-name)
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  "Set the foreground color of the selected frame to COLOR.
When called interactively, prompt for the name of the color to use."
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  (interactive "sColor: ")
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  (modify-frame-parameters (selected-frame)
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			   (list (cons 'foreground-color color-name))))
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(defun set-cursor-color (color-name)
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  "Set the text cursor color of the selected frame to COLOR.
When called interactively, prompt for the name of the color to use."
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  (interactive "sColor: ")
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  (modify-frame-parameters (selected-frame)
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			   (list (cons 'cursor-color color-name))))
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(defun set-mouse-color (color-name)
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  "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."
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  (interactive "sColor: ")
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  (modify-frame-parameters (selected-frame)
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			   (list (cons 'mouse-color color-name))))

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(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)
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  "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)))
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  (modify-frame-parameters (selected-frame)
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			   (list (cons 'auto-raise (> arg 0)))))

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(defun auto-lower-mode (arg)
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  "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)))
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  (modify-frame-parameters (selected-frame)
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			   (list (cons 'auto-lower (> arg 0)))))

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(defun toggle-vertical-scroll-bar (arg)
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  "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."
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  (interactive "P")
  (if (null arg)
      (setq arg
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	    (if (cdr (assq 'vertical-scroll-bars
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			   (frame-parameters (selected-frame))))
		-1 1)))
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  (modify-frame-parameters (selected-frame)
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			   (list (cons 'vertical-scroll-bars (> arg 0)))))
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(defun toggle-horizontal-scroll-bar (arg)
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  "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."
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  (interactive "P")
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  (error "Horizontal scroll bars aren't implemented yet"))
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;;;; Aliases for backward compatibility with Emacs 18.
(fset 'screen-height 'frame-height)
(fset 'screen-width 'frame-width)
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(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\
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should use `set-frame-width instead'."
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  (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\
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should use `set-frame-width' instead."
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  (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)
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;;;; Key bindings
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(defvar ctl-x-5-map (make-sparse-keymap)
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  "Keymap for frame commands.")
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(fset 'ctl-x-5-prefix ctl-x-5-map)
(define-key ctl-x-map "5" 'ctl-x-5-prefix)
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(define-key ctl-x-5-map "2" 'new-frame)
(define-key ctl-x-5-map "0" 'delete-frame)
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(provide 'frame)
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;;; frame.el ends here