Commit 64c669bc authored by Jim Blandy's avatar Jim Blandy
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Initial revision

parent 996896e6
;;;; Multi-screen management that is independent of window systems.
;;;; Copyright (C) 1990 Free Software Foundation, Inc.
;;; 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 1, 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
;;; 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.
(provide 'screen)
(defvar screen-creation-function nil
"Window-system dependent function to call to create a new screen.
The window system startup file should set this to its screen creation
function, which should take an alist of parameters as its argument.")
;;; The default value for this must ask for a minibuffer. There must
;;; always exist a screen with a minibuffer, and after we delete the
;;; terminal screen, this will be the only screen.
(defvar initial-screen-alist '((minibuffer . nil))
"Alist of values used when creating the initial emacs text screen.
These may be set in your init file, like this:
(setq initial-screen-alist '((top . 1) (left . 1) (width . 80) (height . 55)))
These supercede the values given in screen-default-alist.")
(defvar minibuffer-screen-alist nil
"Alist of values to apply to a minibuffer screen.
These may be set in your init file, like this:
(setq minibuffer-screen-alist
'((top . 1) (left . 1) (width . 80) (height . 1)))
These supercede the values given in default-screen-alist.")
(defvar pop-up-screen-alist nil
"Alist of values used when creating pop-up screens.
Pop-up screens are used for completions, help, and the like.
This variable can be set in your init file, like this:
(setq pop-up-screen-alist '((width . 80) (height . 20)))
These supercede the values given in default-screen-alist.")
(setq pop-up-screen-function
(function (lambda ()
(new-screen pop-up-screen-alist))))
;;;; Arrangement of screens 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 screens specified in the window system defaults.
;;; 2) If no screens have been opened, we open an initial text screen.
;;; 3) Once the init file is done, we apply any newly set parameters
;;; in initial-screen-alist to the screen.
(add-hook 'pre-init-hook 'screen-initialize)
(add-hook 'window-setup-hook 'screen-notice-user-settings)
;;; If we create the initial screen, this is it.
(defvar screen-initial-screen nil)
;;; startup.el calls this function before loading the user's init
;;; file - if there is no screen with a minibuffer open now, create
;;; one to display messages while loading the init file.
(defun screen-initialize ()
;; Are we actually running under a window system at all?
(if (and window-system (not noninteractive))
(let ((screens (screen-list)))
;; Look for a screen that has a minibuffer.
(while (and screens
(or (eq (car screens) terminal-screen)
(not (cdr (assq 'minibuffer
(car screens)))))))
(setq screens (cdr screens)))
;; If there was none, then we need to create the opening screen.
(or screens
(setq global-minibuffer-screen
(setq screen-initial-screen
(new-screen initial-screen-alist))))
;; At this point, we know that we have a screen open, so we
;; can delete the terminal screen.
(delete-screen terminal-screen)
(setq terminal-screen nil))
;; No, we're not running a window system. Arrange to cause errors.
(setq screen-creation-function
(lambda (parameters)
"Can't create multiple screens without a window system.")))))
;;; startup.el calls this function after loading the user's init file.
;;; If we created a minibuffer before knowing if we had permission, we
;;; need to see if it should go away or change. Create a text screen
;;; here.
(defun screen-notice-user-settings ()
(if screen-initial-screen
;; If the user wants a minibuffer-only screen, we'll have to
;; make a new one; you can't remove or add a root window to/from
;; an existing screen.
(if (eq (cdr (or (assq 'minibuffer initial-screen-alist)
'(minibuffer . t)))
(setq global-minibuffer-screen
(new-screen initial-screen-alist))
(delete-screen screen-initial-screen))
(modify-screen-parameters screen-initial-screen
;; Make sure the initial screen can be GC'd if it is ever deleted.
(makunbound 'screen-initial-screen))
;;;; Creation of additional screens
;;; Return some screen other than the current screen,
;;; creating one if neccessary. Note that the minibuffer screen, if
;;; separate, is not considered (see next-screen).
(defun get-screen ()
(let ((s (if (equal (next-screen (selected-screen)) (selected-screen))
(next-screen (selected-screen)))))
(defun next-multiscreen-window ()
"Select the next window, regardless of which screen it is on."
(select-window (next-window (selected-window)
(> (minibuffer-depth) 0)
(defun previous-multiscreen-window ()
"Select the previous window, regardless of which screen it is on."
(select-window (previous-window (selected-window)
(> (minibuffer-depth) 0)
(defun new-screen (&optional parameters)
"Create a new screen, displaying the current buffer."
(funcall screen-creation-function parameters))
;;;; Iconification
;;; A possible enhancement for the below: if you iconify a surrogate
;;; minibuffer screen, iconify all of its minibuffer's users too;
;;; de-iconify them as a group. This will need to wait until screens
;;; have mapping and unmapping hooks.
(defun iconify ()
"Iconify or deiconify the selected screen."
(let ((screen (selected-screen)))
(if (eq (screen-visible-p screen) t)
(iconify-screen screen)
(deiconify-screen screen))))
;;;; Convenience functions for dynamically changing screen parameters
(defun set-screen-height (h)
(interactive "NHeight: ")
(let* ((screen (selected-screen))
(width (cdr (assoc 'width (screen-parameters (selected-screen))))))
(set-screen-size (selected-screen) width h)))
(defun set-screen-width (w)
(interactive "NWidth: ")
(let* ((screen (selected-screen))
(height (cdr (assoc 'height (screen-parameters (selected-screen))))))
(set-screen-size (selected-screen) w height)))
(defun set-default-font (font-name)
(interactive "sFont name: ")
(modify-screen-parameters (selected-screen)
(list (cons 'font font-name))))
(defun set-screen-background (color-name)
(interactive "sColor: ")
(modify-screen-parameters (selected-screen)
(list (cons 'background-color color-name))))
(defun set-screen-foreground (color-name)
(interactive "sColor: ")
(modify-screen-parameters (selected-screen)
(list (cons 'foreground-color color-name))))
(defun set-cursor-color (color-name)
(interactive "sColor: ")
(modify-screen-parameters (selected-screen)
(list (cons 'cursor-color color-name))))
(defun set-pointer-color (color-name)
(interactive "sColor: ")
(modify-screen-parameters (selected-screen)
(list (cons 'mouse-color color-name))))
(defun set-auto-raise (toggle)
(interactive "xt or nil? ")
(modify-screen-parameters (selected-screen)
(list (cons 'auto-raise toggle))))
(defun set-auto-lower (toggle)
(interactive "xt or nil? ")
(modify-screen-parameters (selected-screen)
(list (cons 'auto-lower toggle))))
(defun set-vertical-bar (toggle)
(interactive "xt or nil? ")
(modify-screen-parameters (selected-screen)
(list (cons 'vertical-scroll-bar toggle))))
(defun set-horizontal-bar (toggle)
(interactive "xt or nil? ")
(modify-screen-parameters (selected-screen)
(list (cons 'horizontal-scroll-bar toggle))))
;;;; Key bindings
(define-prefix-command 'ctl-x-3-map)
(define-key ctl-x-map "3" 'ctl-x-3-map)
(define-key global-map "\C-z" 'iconify)
(define-key ctl-x-3-map "2" 'new-screen)
(define-key ctl-x-3-map "0" 'delete-screen)
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