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7fdbcd8387
* window.el (split-window-vertically): * whitespace.el (whitespace-help-on): * vc-rcs.el (vc-rcs-consult-headers): * userlock.el (ask-user-about-lock-help) (ask-user-about-supersession-help): * type-break.el (type-break-force-mode-line-update): * time-stamp.el (time-stamp-conv-warn): * terminal.el (te-set-output-log, te-more-break, te-filter) (te-sentinel,terminal-emulator): * term.el (make-term, term-exec, term-sentinel, term-read-input-ring) (term-write-input-ring, term-check-source, term-start-output-log): (term-display-buffer-line, term-dynamic-list-completions): (term-ansi-make-term, serial-term): * subr.el (selective-display): * strokes.el (strokes-xpm-to-compressed-string, strokes-decode-buffer) (strokes-encode-buffer, strokes-xpm-for-compressed-string): * speedbar.el (speedbar-buffers-tail-notes, speedbar-buffers-item-info) (speedbar-reconfigure-keymaps, speedbar-add-localized-speedbar-support) (speedbar-remove-localized-speedbar-support) (speedbar-set-mode-line-format, speedbar-create-tag-hierarchy) (speedbar-update-special-contents, speedbar-buffer-buttons-engine) (speedbar-buffers-line-directory): * simple.el (shell-command-on-region, append-to-buffer) (prepend-to-buffer): * shadowfile.el (shadow-save-todo-file): * scroll-bar.el (scroll-bar-set-window-start, scroll-bar-drag-1) (scroll-bar-maybe-set-window-start): * sb-image.el (speedbar-image-dump): * saveplace.el (save-place-alist-to-file, save-places-to-alist) (load-save-place-alist-from-file): * ps-samp.el (ps-print-message-from-summary): * ps-print.el (ps-flush-output, ps-insert-file, ps-get-boundingbox) (ps-background-image, ps-begin-job, ps-do-despool): * ps-bdf.el (bdf-find-file, bdf-read-font-info): * printing.el (pr-interface, pr-ps-file-print, pr-find-buffer-visiting) (pr-ps-message-from-summary, pr-lpr-message-from-summary): (pr-call-process, pr-file-list, pr-interface-save): * novice.el (disabled-command-function) (enable-command, disable-command): * mouse.el (mouse-buffer-menu-alist): * mouse-copy.el (mouse-kill-preserving-secondary): * macros.el (kbd-macro-query): * ledit.el (ledit-go-to-lisp, ledit-go-to-liszt): * informat.el (batch-info-validate): * ido.el (ido-copy-current-word, ido-initiate-auto-merge): * hippie-exp.el (try-expand-dabbrev-visible): * help-mode.el (help-make-xrefs): * help-fns.el (describe-variable): * generic-x.el (bat-generic-mode-run-as-comint): * finder.el (finder-mouse-select): * find-dired.el (find-dired-sentinel): * filesets.el (filesets-file-close): * files.el (list-directory): * faces.el (list-faces-display, describe-face): * facemenu.el (list-colors-display): * ezimage.el (ezimage-image-association-dump, ezimage-image-dump): * epg.el (epg--process-filter, epg-cancel): * epa.el (epa--marked-keys, epa--select-keys, epa-display-info) (epa--read-signature-type): * emerge.el (emerge-copy-as-kill-A, emerge-copy-as-kill-B) (emerge-file-names): * ehelp.el (electric-helpify): * ediff.el (ediff-regions-wordwise, ediff-regions-linewise): * ediff-vers.el (rcs-ediff-view-revision): * ediff-util.el (ediff-setup): * ediff-mult.el (ediff-append-custom-diff): * ediff-diff.el (ediff-exec-process, ediff-process-sentinel) (ediff-wordify): * echistory.el (Electric-command-history-redo-expression): * dos-w32.el (find-file-not-found-set-buffer-file-coding-system): * disp-table.el (describe-display-table): * dired.el (dired-find-buffer-nocreate): * dired-aux.el (dired-rename-subdir, dired-dwim-target-directory): * dabbrev.el (dabbrev--same-major-mode-p): * chistory.el (list-command-history): * apropos.el (apropos-documentation): * allout.el (allout-obtain-passphrase): (allout-copy-exposed-to-buffer): (allout-verify-passphrase): Use with-current-buffer.
360 lines
12 KiB
EmacsLisp
360 lines
12 KiB
EmacsLisp
;;; scroll-bar.el --- window system-independent scroll bar support
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;; Copyright (C) 1993, 1994, 1995, 1999, 2000, 2001, 2002, 2003,
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;; 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
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;; Maintainer: FSF
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;; Keywords: hardware
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Window-system-independent bindings of mouse clicks on the scroll bar.
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;; Presently emulates the scroll-bar behavior of xterm.
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;;; Code:
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(require 'mouse)
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;;;; Utilities.
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(defun scroll-bar-event-ratio (event)
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"Given a scroll bar event EVENT, return the scroll bar position as a ratio.
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The value is a cons cell (PORTION . WHOLE) containing two integers
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whose ratio gives the event's vertical position in the scroll bar, with 0
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referring to the top and 1 to the bottom."
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(nth 2 event))
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(defun scroll-bar-scale (num-denom whole)
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"Given a pair (NUM . DENOM) and WHOLE, return (/ (* NUM WHOLE) DENOM).
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This is handy for scaling a position on a scroll bar into real units,
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like buffer positions. If SCROLL-BAR-POS is the (PORTION . WHOLE) pair
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from a scroll bar event, then (scroll-bar-scale SCROLL-BAR-POS
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\(buffer-size)) is the position in the current buffer corresponding to
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that scroll bar position."
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;; We multiply before we divide to maintain precision.
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;; We use floating point because the product of a large buffer size
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;; with a large scroll bar portion can easily overflow a lisp int.
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(truncate (/ (* (float (car num-denom)) whole) (cdr num-denom))))
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(defun scroll-bar-columns (side)
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"Return the width, measured in columns, of the vertical scrollbar on SIDE.
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SIDE must be the symbol `left' or `right'."
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(let* ((wsb (window-scroll-bars))
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(vtype (nth 2 wsb))
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(cols (nth 1 wsb)))
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(cond
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((not (memq side '(left right)))
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(error "`left' or `right' expected instead of %S" side))
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((and (eq vtype side) cols))
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((eq (frame-parameter nil 'vertical-scroll-bars) side)
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;; nil means it's a non-toolkit scroll bar, and its width in
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;; columns is 14 pixels rounded up.
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(ceiling (or (frame-parameter nil 'scroll-bar-width) 14)
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(frame-char-width)))
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(0))))
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;;;; Helpful functions for enabling and disabling scroll bars.
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(defvar scroll-bar-mode)
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(defvar previous-scroll-bar-mode nil)
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(defvar scroll-bar-mode-explicit nil
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"Non-nil means `set-scroll-bar-mode' should really do something.
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This is nil while loading `scroll-bar.el', and t afterward.")
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(defun set-scroll-bar-mode-1 (ignore value)
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(set-scroll-bar-mode value))
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(defun set-scroll-bar-mode (value)
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"Set `scroll-bar-mode' to VALUE and put the new value into effect."
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(if scroll-bar-mode
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(setq previous-scroll-bar-mode scroll-bar-mode))
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(setq scroll-bar-mode value)
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(when scroll-bar-mode-explicit
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(modify-all-frames-parameters (list (cons 'vertical-scroll-bars
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scroll-bar-mode)))))
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(defcustom scroll-bar-mode default-frame-scroll-bars
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"Specify whether to have vertical scroll bars, and on which side.
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Possible values are nil (no scroll bars), `left' (scroll bars on left)
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and `right' (scroll bars on right).
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To set this variable in a Lisp program, use `set-scroll-bar-mode'
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to make it take real effect.
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Setting the variable with a customization buffer also takes effect."
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:type '(choice (const :tag "none (nil)" nil)
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(const left)
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(const right))
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:group 'frames
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;; The default value for :initialize would try to use :set
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;; when processing the file in cus-dep.el.
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:initialize 'custom-initialize-default
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:set 'set-scroll-bar-mode-1)
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;; We just set scroll-bar-mode, but that was the default.
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;; If it is set again, that is for real.
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(setq scroll-bar-mode-explicit t)
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(defun scroll-bar-mode (&optional flag)
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"Toggle display of vertical scroll bars on all frames.
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This command applies to all frames that exist and frames to be
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created in the future.
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With a numeric argument, if the argument is positive
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turn on scroll bars; otherwise turn off scroll bars."
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(interactive "P")
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;; Tweedle the variable according to the argument.
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(set-scroll-bar-mode (if (if (null flag)
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(not scroll-bar-mode)
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(setq flag (prefix-numeric-value flag))
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(or (not (numberp flag)) (> flag 0)))
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(or previous-scroll-bar-mode
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default-frame-scroll-bars))))
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(defun toggle-scroll-bar (arg)
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"Toggle whether or not the selected frame has vertical scroll bars.
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With arg, turn vertical scroll bars on if and only if arg is positive.
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The variable `scroll-bar-mode' controls which side the scroll bars are on
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when they are turned on; if it is nil, they go on the left."
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(interactive "P")
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(if (null arg)
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(setq arg
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(if (cdr (assq 'vertical-scroll-bars
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(frame-parameters (selected-frame))))
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-1 1))
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(setq arg (prefix-numeric-value arg)))
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(modify-frame-parameters
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(selected-frame)
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(list (cons 'vertical-scroll-bars
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(if (> arg 0)
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(or scroll-bar-mode default-frame-scroll-bars))))))
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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.
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With arg, turn horizontal scroll bars on if and only if arg is positive.
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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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;;;; Buffer navigation using the scroll bar.
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;; This was used for up-events on button 2, but no longer.
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(defun scroll-bar-set-window-start (event)
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"Set the window start according to where the scroll bar is dragged.
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EVENT should be a scroll bar click or drag event."
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(interactive "e")
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(let* ((end-position (event-end event))
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(window (nth 0 end-position))
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(portion-whole (nth 2 end-position)))
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(with-current-buffer (window-buffer window)
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(save-excursion
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(goto-char (+ (point-min)
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(scroll-bar-scale portion-whole
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(- (point-max) (point-min)))))
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(beginning-of-line)
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(set-window-start window (point))))))
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(defun scroll-bar-drag-position (portion-whole)
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"Calculate new window start for drag event."
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(save-excursion
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(goto-char (+ (point-min)
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(scroll-bar-scale portion-whole
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(- (point-max) (point-min)))))
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(beginning-of-line)
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(point)))
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(defun scroll-bar-maybe-set-window-start (event)
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"Set the window start according to where the scroll bar is dragged.
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Only change window start if the new start is substantially different.
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EVENT should be a scroll bar click or drag event."
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(interactive "e")
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(let* ((end-position (event-end event))
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(window (nth 0 end-position))
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(portion-whole (nth 2 end-position))
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(next-portion-whole (cons (1+ (car portion-whole))
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(cdr portion-whole)))
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portion-start
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next-portion-start
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(current-start (window-start window)))
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(with-current-buffer (window-buffer window)
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(setq portion-start (scroll-bar-drag-position portion-whole))
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(setq next-portion-start (max
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(scroll-bar-drag-position next-portion-whole)
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(1+ portion-start)))
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(if (or (>= current-start next-portion-start)
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(< current-start portion-start))
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(set-window-start window portion-start)
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;; Always set window start, to ensure scroll bar position is updated.
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(set-window-start window current-start)))))
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;; Scroll the window to the proper position for EVENT.
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(defun scroll-bar-drag-1 (event)
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(let* ((start-position (event-start event))
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(window (nth 0 start-position))
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(portion-whole (nth 2 start-position)))
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(with-current-buffer (window-buffer window)
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;; Calculate position relative to the accessible part of the buffer.
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(goto-char (+ (point-min)
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(scroll-bar-scale portion-whole
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(- (point-max) (point-min)))))
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(vertical-motion 0 window)
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(set-window-start window (point)))))
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(defun scroll-bar-drag (event)
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"Scroll the window by dragging the scroll bar slider.
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If you click outside the slider, the window scrolls to bring the slider there."
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(interactive "e")
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(let* (done
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(echo-keystrokes 0)
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(end-position (event-end event))
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(window (nth 0 end-position))
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(before-scroll))
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(with-current-buffer (window-buffer window)
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(setq before-scroll point-before-scroll))
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(save-selected-window
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(select-window window)
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(setq before-scroll
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(or before-scroll (point))))
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(scroll-bar-drag-1 event)
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(track-mouse
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(while (not done)
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(setq event (read-event))
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(if (eq (car-safe event) 'mouse-movement)
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(setq event (read-event)))
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(cond ((eq (car-safe event) 'scroll-bar-movement)
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(scroll-bar-drag-1 event))
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(t
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;; Exit when we get the drag event; ignore that event.
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(setq done t)))))
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(sit-for 0)
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(with-current-buffer (window-buffer window)
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(setq point-before-scroll before-scroll))))
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(defun scroll-bar-scroll-down (event)
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"Scroll the window's top line down to the location of the scroll bar click.
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EVENT should be a scroll bar click."
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(interactive "e")
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(let* ((end-position (event-end event))
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(window (nth 0 end-position))
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(before-scroll))
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(with-current-buffer (window-buffer window)
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(setq before-scroll point-before-scroll))
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(unwind-protect
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(save-selected-window
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(let ((portion-whole (nth 2 end-position)))
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(select-window window)
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(setq before-scroll
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(or before-scroll (point)))
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(scroll-down
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(scroll-bar-scale portion-whole (1- (window-height)))))
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(sit-for 0))
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(with-current-buffer (window-buffer window)
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(setq point-before-scroll before-scroll)))))
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(defun scroll-bar-scroll-up (event)
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"Scroll the line next to the scroll bar click to the top of the window.
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EVENT should be a scroll bar click."
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(interactive "e")
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(let* ((end-position (event-end event))
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(window (nth 0 end-position))
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(before-scroll))
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(with-current-buffer (window-buffer window)
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(setq before-scroll point-before-scroll))
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(unwind-protect
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(save-selected-window
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(let ((portion-whole (nth 2 end-position)))
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(select-window window)
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(setq before-scroll
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(or before-scroll (point)))
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(scroll-up
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(scroll-bar-scale portion-whole (1- (window-height)))))
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(sit-for 0))
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(with-current-buffer (window-buffer window)
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(setq point-before-scroll before-scroll)))))
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;;; Tookit scroll bars.
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(defun scroll-bar-toolkit-scroll (event)
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(interactive "e")
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(let* ((end-position (event-end event))
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(window (nth 0 end-position))
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(part (nth 4 end-position))
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before-scroll)
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(cond ((eq part 'end-scroll))
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(t
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(with-current-buffer (window-buffer window)
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(setq before-scroll point-before-scroll))
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(save-selected-window
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(select-window window)
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(setq before-scroll (or before-scroll (point)))
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(cond ((eq part 'above-handle)
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(scroll-up '-))
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((eq part 'below-handle)
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(scroll-up nil))
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((eq part 'ratio)
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(let* ((portion-whole (nth 2 end-position))
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(lines (scroll-bar-scale portion-whole
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(1- (window-height)))))
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(scroll-up (cond ((not (zerop lines)) lines)
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((< (car portion-whole) 0) -1)
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(t 1)))))
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((eq part 'up)
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(scroll-up -1))
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((eq part 'down)
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(scroll-up 1))
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((eq part 'top)
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(set-window-start window (point-min)))
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((eq part 'bottom)
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(goto-char (point-max))
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(recenter))
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((eq part 'handle)
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(scroll-bar-drag-1 event))))
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(sit-for 0)
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(with-current-buffer (window-buffer window)
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(setq point-before-scroll before-scroll))))))
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;;;; Bindings.
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;; For now, we'll set things up to work like xterm.
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(cond ((and (boundp 'x-toolkit-scroll-bars) x-toolkit-scroll-bars)
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(global-set-key [vertical-scroll-bar mouse-1]
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'scroll-bar-toolkit-scroll))
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(t
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(global-set-key [vertical-scroll-bar mouse-1]
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'scroll-bar-scroll-up)
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(global-set-key [vertical-scroll-bar drag-mouse-1]
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'scroll-bar-scroll-up)
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(global-set-key [vertical-scroll-bar down-mouse-2]
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'scroll-bar-drag)
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(global-set-key [vertical-scroll-bar mouse-3]
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'scroll-bar-scroll-down)
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(global-set-key [vertical-scroll-bar drag-mouse-3]
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'scroll-bar-scroll-down)))
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(provide 'scroll-bar)
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;; arch-tag: 6f1d01d0-0b1e-4bf8-86db-d491e0f399f3
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;;; scroll-bar.el ends here
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