-;;; scroll-bar.el --- window system-independent scroll bar support.
+;;; scroll-bar.el --- window system-independent scroll bar support
-;; Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
+;; Copyright (C) 1993, 1994, 1995, 1999, 2000, 2001, 2002, 2003,
+;; 2004, 2005, 2006 Free Software Foundation, Inc.
;; Maintainer: FSF
;; Keywords: hardware
;; 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, Inc., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
;;; Commentary:
;; with a large scroll bar portion can easily overflow a lisp int.
(truncate (/ (* (float (car num-denom)) whole) (cdr num-denom))))
+(defun scroll-bar-columns (side)
+ "Return the width, measured in columns, of the vertical scrollbar on SIDE.
+SIDE must be the symbol `left' or `right'."
+ (let* ((wsb (window-scroll-bars))
+ (vtype (nth 2 wsb))
+ (cols (nth 1 wsb)))
+ (cond
+ ((not (memq side '(left right)))
+ (error "`left' or `right' expected instead of %S" side))
+ ((and (eq vtype side) cols))
+ ((eq (frame-parameter nil 'vertical-scroll-bars) side)
+ ;; nil means it's a non-toolkit scroll bar, and its width in
+ ;; columns is 14 pixels rounded up.
+ (ceiling (or (frame-parameter nil 'scroll-bar-width) 14)
+ (frame-char-width)))
+ (0))))
+
\f
;;;; Helpful functions for enabling and disabling scroll bars.
(list (cons 'vertical-scroll-bars scroll-bar-mode)))
(setq frames (cdr frames))))))
-(defcustom scroll-bar-mode
- (if (eq system-type 'windows-nt) 'right 'left)
+(defcustom scroll-bar-mode default-frame-scroll-bars
"*Specify whether to have vertical scroll bars, and on which side.
Possible values are nil (no scroll bars), `left' (scroll bars on left)
and `right' (scroll bars on right).
To set this variable in a Lisp program, use `set-scroll-bar-mode'
to make it take real effect.
Setting the variable with a customization buffer also takes effect."
- :type '(choice (const :tag "none (nil)")
+ :type '(choice (const :tag "none (nil)" nil)
(const left)
(const right))
:group 'frames
+ ;; The default value for :initialize would try to use :set
+ ;; when processing the file in cus-dep.el.
+ :initialize 'custom-initialize-default
:set 'set-scroll-bar-mode-1)
;; We just set scroll-bar-mode, but that was the default.
;; If it is set again, that is for real.
(setq scroll-bar-mode-explicit t)
-(defun scroll-bar-mode (flag)
+(defun scroll-bar-mode (&optional flag)
"Toggle display of vertical scroll bars on all frames.
This command applies to all frames that exist and frames to be
created in the future.
With a numeric argument, if the argument is negative,
turn off scroll bars; otherwise, turn on scroll bars."
(interactive "P")
- (if flag (setq flag (prefix-numeric-value flag)))
;; Tweedle the variable according to the argument.
- (set-scroll-bar-mode (if (null flag) (not scroll-bar-mode)
- (and (or (not (numberp flag)) (>= flag 0))
- (if (eq system-type 'windows-nt) 'right 'left)))))
+ (set-scroll-bar-mode (if (if (null flag)
+ (not scroll-bar-mode)
+ (setq flag (prefix-numeric-value flag))
+ (or (not (numberp flag)) (>= flag 0)))
+ default-frame-scroll-bars)))
(defun toggle-scroll-bar (arg)
"Toggle whether or not the selected frame has vertical scroll bars.
(selected-frame)
(list (cons 'vertical-scroll-bars
(if (> arg 0)
- (or scroll-bar-mode
- (if (eq system-type 'windows-nt) 'right 'left)))))))
+ (or scroll-bar-mode default-frame-scroll-bars))))))
(defun toggle-horizontal-scroll-bar (arg)
"Toggle whether or not the selected frame has horizontal scroll bars.
(goto-char (+ (point-min)
(scroll-bar-scale portion-whole
(- (point-max) (point-min)))))
- (beginning-of-line)
+ (vertical-motion 0 window)
(set-window-start window (point)))))
(defun scroll-bar-drag (event)
(setq point-before-scroll before-scroll)))))
\f
-;;;; Bindings.
+;;; Tookit scroll bars.
-;;; For now, we'll set things up to work like xterm.
-(global-set-key [vertical-scroll-bar mouse-1] 'scroll-bar-scroll-up)
-(global-set-key [vertical-scroll-bar drag-mouse-1] 'scroll-bar-scroll-up)
+(defun scroll-bar-toolkit-scroll (event)
+ (interactive "e")
+ (let* ((end-position (event-end event))
+ (window (nth 0 end-position))
+ (part (nth 4 end-position))
+ before-scroll)
+ (cond ((eq part 'end-scroll))
+ (t
+ (with-current-buffer (window-buffer window)
+ (setq before-scroll point-before-scroll))
+ (save-selected-window
+ (select-window window)
+ (setq before-scroll (or before-scroll (point)))
+ (cond ((eq part 'above-handle)
+ (scroll-up '-))
+ ((eq part 'below-handle)
+ (scroll-up nil))
+ ((eq part 'ratio)
+ (let* ((portion-whole (nth 2 end-position))
+ (lines (scroll-bar-scale portion-whole
+ (1- (window-height)))))
+ (scroll-up (cond ((not (zerop lines)) lines)
+ ((< (car portion-whole) 0) -1)
+ (t 1)))))
+ ((eq part 'up)
+ (scroll-up -1))
+ ((eq part 'down)
+ (scroll-up 1))
+ ((eq part 'top)
+ (set-window-start window (point-min)))
+ ((eq part 'bottom)
+ (goto-char (point-max))
+ (recenter))
+ ((eq part 'handle)
+ (scroll-bar-drag-1 event))))
+ (sit-for 0)
+ (with-current-buffer (window-buffer window)
+ (setq point-before-scroll before-scroll))))))
-(global-set-key [vertical-scroll-bar down-mouse-2] 'scroll-bar-drag)
-(global-set-key [vertical-scroll-bar mouse-3] 'scroll-bar-scroll-down)
-(global-set-key [vertical-scroll-bar drag-mouse-3] 'scroll-bar-scroll-down)
+\f
+;;;; Bindings.
+
+;;; For now, we'll set things up to work like xterm.
+(cond ((and (boundp 'x-toolkit-scroll-bars) x-toolkit-scroll-bars)
+ (global-set-key [vertical-scroll-bar mouse-1]
+ 'scroll-bar-toolkit-scroll))
+ (t
+ (global-set-key [vertical-scroll-bar mouse-1]
+ 'scroll-bar-scroll-up)
+ (global-set-key [vertical-scroll-bar drag-mouse-1]
+ 'scroll-bar-scroll-up)
+ (global-set-key [vertical-scroll-bar down-mouse-2]
+ 'scroll-bar-drag)
+ (global-set-key [vertical-scroll-bar mouse-3]
+ 'scroll-bar-scroll-down)
+ (global-set-key [vertical-scroll-bar drag-mouse-3]
+ 'scroll-bar-scroll-down)))
\f
(provide 'scroll-bar)
+;;; arch-tag: 6f1d01d0-0b1e-4bf8-86db-d491e0f399f3
;;; scroll-bar.el ends here