XEmacs 21.2-b1

[chise/xemacs-chise.git.1] / lisp / scrollbar.el

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+;;; scrollbar.el --- Scrollbar support for XEmacs
+
+;; Copyright (C) 1995, 1997 Free Software Foundation, Inc.
+
+;; Maintainer: XEmacs Development Team
+;; Keywords: internal, extensions, dumped
+
+;; This file is part of XEmacs.
+
+;; XEmacs 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.
+
+;; XEmacs 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 XEmacs; see the file COPYING.  If not, write to the 
+;; Free Software Foundation, 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Synched up with: Not in FSF. (Completely divergent from FSF scroll-bar.el)
+
+;;; Commentary:
+
+;; This file is dumped with XEmacs (when scrollbar support is compiled in).
+
+;;; Code:
+
+;; added for the options menu - dverna
+(defcustom scrollbars-visible-p t
+  "Whether the scrollbars are globally visible.
+This variable can be customized through the options menu."
+  :type 'boolean
+  :set (lambda (var val)
+        (set-specifier vertical-scrollbar-visible-p val)
+        (set-specifier horizontal-scrollbar-visible-p val)
+        (setq-default scrollbars-visible-p val))
+  :group 'display)
+
+(defun init-scrollbar-from-resources (locale)
+  (when (and (featurep 'x)
+            (or (eq locale 'global)
+                (eq 'x (device-or-frame-type locale))))
+    (x-init-scrollbar-from-resources locale))
+  (when (and (featurep 'mswindows)
+            (or (eq locale 'global)
+                (eq 'mswindows (device-or-frame-type locale))))
+    (mswindows-init-scrollbar-metrics locale)))
+
+;;
+;; vertical scrollbar functions
+;;
+
+;;; ### Move functions from C into Lisp here!
+
+;;
+;; horizontal scrollbar functions
+;;
+
+(defun scrollbar-char-left (window)
+  "Function called when the char-left arrow on the scrollbar is clicked.
+This is the little arrow to the left of the scrollbar.  One argument is
+passed, the scrollbar's window.  You can advise this function to
+change the scrollbar behavior."
+  (when (window-live-p window)
+    (scrollbar-set-hscroll window (- (window-hscroll window) 1))
+    (setq zmacs-region-stays t)
+    nil))
+
+(defun scrollbar-char-right (window)
+  "Function called when the char-right arrow on the scrollbar is clicked.
+This is the little arrow to the right of the scrollbar.  One argument is
+passed, the scrollbar's window.  You can advise this function to
+change the scrollbar behavior."
+  (when (window-live-p window)
+    (scrollbar-set-hscroll window (+ (window-hscroll window) 1))
+    (setq zmacs-region-stays t)
+    nil))
+
+(defun scrollbar-page-left (window)
+  "Function called when the user gives the \"page-left\" scrollbar action.
+\(The way this is done can vary from scrollbar to scrollbar.\) One argument is
+passed, the scrollbar's window.  You can advise this function to
+change the scrollbar behavior."
+  (when (window-live-p window)
+    (scrollbar-set-hscroll window (- (window-hscroll window)
+                                    (- (window-width window) 2)))
+    (setq zmacs-region-stays t)
+    nil))
+
+(defun scrollbar-page-right (window)
+  "Function called when the user gives the \"page-right\" scrollbar action.
+\(The way this is done can vary from scrollbar to scrollbar.\) One argument is
+passed, the scrollbar's window.  You can advise this function to
+change the scrollbar behavior."
+  (when (window-live-p window)
+    (scrollbar-set-hscroll window (+ (window-hscroll window)
+                                    (- (window-width window) 2)))
+    (setq zmacs-region-stays t)
+    nil))
+
+(defun scrollbar-to-left (window)
+  "Function called when the user gives the \"to-left\" scrollbar action.
+\(The way this is done can vary from scrollbar to scrollbar.\). One argument is
+passed, the scrollbar's window.  You can advise this function to
+change the scrollbar behavior."
+  (when (window-live-p window)
+    (scrollbar-set-hscroll window 0)
+    (setq zmacs-region-stays t)
+    nil))
+
+(defun scrollbar-to-right (window)
+  "Function called when the user gives the \"to-right\" scrollbar action.
+\(The way this is done can vary from scrollbar to scrollbar.\). One argument is
+passed, the scrollbar's window.  You can advise this function to
+change the scrollbar behavior."
+  (when (window-live-p window)
+    (scrollbar-set-hscroll window 'max)
+    (setq zmacs-region-stays t)
+    nil))
+
+(defun scrollbar-horizontal-drag (data)
+  "Function called when the user drags the horizontal scrollbar thumb.
+One argument is passed, a cons containing the scrollbar's window and a value
+representing how many columns the thumb is slid over.  You can advise
+this function to change the scrollbar behavior."
+  (let ((window (car data))
+       (value  (cdr data)))
+    (when (and (window-live-p window) (integerp value))
+      (scrollbar-set-hscroll window value)
+      (setq zmacs-region-stays t)
+      nil)))
+
+;;; scrollbar.el ends here