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e734f8e502
* lisp/xt-mouse.el (xterm-mouse--same-button-p): New function. (xterm-mouse--read-event-sequence): Use it to obey `mouse-wheel-*-event` variables. * lisp/mwheel.el (mouse-wheel-obey-old-style-wheel-buttons): Update docstring.
508 lines
21 KiB
EmacsLisp
508 lines
21 KiB
EmacsLisp
;;; mwheel.el --- Mouse wheel support -*- lexical-binding:t -*-
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;; Copyright (C) 1998-2024 Free Software Foundation, Inc.
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;; Keywords: mouse
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;; Package: emacs
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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 <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This enables the use of the mouse wheel (or scroll wheel) in Emacs.
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;; Under X11/X.Org, the wheel events are sent as mouse-4/mouse-5
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;; events.
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;; Mouse wheel support is already enabled by default on most graphical
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;; displays. You can toggle it using `M-x mouse-wheel-mode'.
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;;; Code:
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;; Implementation note:
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;;
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;; I for one would prefer some way of converting the mouse-4/mouse-5
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;; events into different event types, like 'wheel-up' or
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;; 'wheel-down', but I cannot find a way to do this very easily (or
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;; portably), so for now I just live with it.
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(require 'timer)
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(defvar mouse-wheel-mode)
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(defvar mouse-wheel--installed-bindings-alist nil
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"Alist of all installed mouse wheel key bindings.")
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;; Setter function for mouse-button user-options. Switch Mouse Wheel
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;; mode off and on again so that the old button is unbound and
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;; new button is bound to mwheel-scroll.
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(defun mouse-wheel-change-button (var button)
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(set-default var button)
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;; Sync the bindings if they're already setup.
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(when (and mouse-wheel--installed-bindings-alist
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(bound-and-true-p mouse-wheel-mode))
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(mouse-wheel-mode 1)))
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(defvar mouse-wheel-obey-old-style-wheel-buttons t
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"If non-nil, treat mouse-4/5/6/7 events as mouse wheel events.
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These are the event names used historically in X11 before XInput2.
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They are sometimes generated by things like text-terminals as well.")
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(defcustom mouse-wheel-down-event
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(if mouse-wheel-obey-old-style-wheel-buttons 'mouse-4)
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"Event used for scrolling down, beside `wheel-up', if any."
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:group 'mouse
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:type 'symbol
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:set #'mouse-wheel-change-button)
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(defcustom mouse-wheel-up-event
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(if mouse-wheel-obey-old-style-wheel-buttons 'mouse-5)
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"Event used for scrolling up, beside `wheel-down', if any."
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:group 'mouse
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:type 'symbol
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:set #'mouse-wheel-change-button)
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(defcustom mouse-wheel-click-event 'mouse-2
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"Event that should be temporarily inhibited after mouse scrolling.
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The mouse wheel is typically on the mouse-2 button, so it may easily
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happen that text is accidentally yanked into the buffer when
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scrolling with the mouse wheel. To prevent that, this variable can be
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set to the event sent when clicking on the mouse wheel button."
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:group 'mouse
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:type 'symbol
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:set #'mouse-wheel-change-button)
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(defcustom mouse-wheel-inhibit-click-time 0.35
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"Time in seconds to inhibit clicking on mouse wheel button after scroll."
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:group 'mouse
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:type 'number)
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(defcustom mouse-wheel-scroll-amount
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'(1 ((shift) . hscroll)
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((meta) . nil)
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((control meta) . global-text-scale)
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((control) . text-scale))
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"Amount to scroll windows by when spinning the mouse wheel.
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This is an alist mapping the modifier key to the amount to scroll when
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the wheel is moved with the modifier key depressed.
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Elements of the list have the form (MODIFIER . AMOUNT) or just AMOUNT if
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MODIFIER is nil.
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AMOUNT should be the number of lines to scroll, or nil for near full
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screen. It can also be a floating point number, specifying the fraction of
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a full screen to scroll. A near full screen is `next-screen-context-lines'
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less than a full screen.
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If AMOUNT is the symbol `hscroll', this means that with MODIFIER,
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the mouse wheel will scroll horizontally instead of vertically.
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If AMOUNT is the symbol `text-scale' or `global-text-scale', this
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means that with MODIFIER, the mouse wheel will change the font size
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instead of scrolling (by adjusting the font height of the default
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face, either locally in the buffer or globally). For more
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information, see `text-scale-adjust' and `global-text-scale-adjust'."
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:group 'mouse
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:type '(cons
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(choice :tag "Normal"
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(const :tag "Full screen" :value nil)
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(integer :tag "Specific # of lines")
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(float :tag "Fraction of window")
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(cons
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(repeat (choice :tag "modifier"
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(const alt) (const control) (const hyper)
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(const meta) (const shift) (const super)))
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(choice :tag "action"
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(const :tag "Scroll full screen" :value nil)
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(integer :tag "Scroll specific # of lines")
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(float :tag "Scroll fraction of window"))))
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(repeat
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(cons
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(repeat (choice :tag "modifier"
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(const alt) (const control) (const hyper)
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(const meta) (const shift) (const super)))
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(choice :tag "action"
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(const :tag "Scroll full screen" :value nil)
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(integer :tag "Scroll specific # of lines")
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(float :tag "Scroll fraction of window")
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(const :tag "Scroll horizontally" :value hscroll)
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(const :tag "Change buffer face size" :value text-scale)
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(const :tag "Change global face size" :value global-text-scale)))))
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:set #'mouse-wheel-change-button
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:version "28.1")
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(defcustom mouse-wheel-progressive-speed t
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"If nil, scrolling speed is proportional to the wheel speed.
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If non-nil, moving the wheel faster will make scrolling
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progressively faster.
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Note that this has no effect when `mouse-wheel-scroll-amount' specifies
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a \"near full screen\" scroll or when the mouse wheel sends key instead
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of button events."
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:group 'mouse
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:type 'boolean)
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(defcustom mouse-wheel-follow-mouse t
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"Whether the mouse wheel should scroll the window that the mouse is over.
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This affects both the commands for scrolling and changing the
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face height."
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:group 'mouse
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:type 'boolean)
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(defcustom mouse-wheel-scroll-amount-horizontal 1
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"Amount to scroll windows horizontally.
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Its value can be changed dynamically by using a numeric prefix argument
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before starting horizontal scrolling.
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It has effect when `mouse-wheel-scroll-amount' binds the value `hscroll'
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to one of modifiers (`Shift' by default)."
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:group 'mouse
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:type 'number
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:version "28.1")
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;;; For tilt-scroll
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;;;
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(defcustom mouse-wheel-tilt-scroll nil
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"Enable horizontal scrolling by tilting mouse wheel or via touchpad.
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Also see `mouse-wheel-flip-direction'."
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:group 'mouse
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:type 'boolean
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:version "26.1")
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(defcustom mouse-wheel-flip-direction nil
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"Swap direction of `wheel-right' and `wheel-left'.
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By default, `wheel-right' scrolls the text to the right,
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and `wheel-left' scrolls in the other direction.
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If this variable is non-nil, it inverts the direction of
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horizontal scrolling by tilting the mouse wheel.
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Also see `mouse-wheel-tilt-scroll'."
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:group 'mouse
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:type 'boolean
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:version "26.1")
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;; This function used to handle the `mouse-wheel` event which was
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;; removed in 2003 by commit 9eb28007fb27, thus making it obsolete.
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(define-obsolete-function-alias 'mwheel-event-button #'event-basic-type "30.1")
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(defun mwheel-event-window (event)
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(posn-window (event-start event)))
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(defvar mwheel-inhibit-click-event-timer nil
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"Timer running while mouse wheel click event is inhibited.")
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(defun mwheel-inhibit-click-timeout ()
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"Handler for `mwheel-inhibit-click-event-timer'."
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(setq mwheel-inhibit-click-event-timer nil)
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(remove-hook 'pre-command-hook 'mwheel-filter-click-events))
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(defun mwheel-filter-click-events ()
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"Discard `mouse-wheel-click-event' while scrolling the mouse."
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(if (eq (event-basic-type last-input-event) mouse-wheel-click-event)
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(setq this-command 'ignore)))
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(defvar mwheel-scroll-up-function 'scroll-up
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"Function that does the job of scrolling upward.")
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(defvar mwheel-scroll-down-function 'scroll-down
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"Function that does the job of scrolling downward.")
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(defvar mwheel-scroll-left-function 'scroll-left
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"Function that does the job of scrolling left.")
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(defvar mwheel-scroll-right-function 'scroll-right
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"Function that does the job of scrolling right.")
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(defvar mouse-wheel-left-event
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(if mouse-wheel-obey-old-style-wheel-buttons 'mouse-6)
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"Event used for scrolling left, beside `wheel-left', if any.")
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(defvar mouse-wheel-right-event
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(if mouse-wheel-obey-old-style-wheel-buttons 'mouse-7)
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"Event used for scrolling right, beside `wheel-right', if any.")
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(defun mouse-wheel--get-scroll-window (event)
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"Return window for mouse wheel event EVENT.
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If `mouse-wheel-follow-mouse' is non-nil, return the window that
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the mouse pointer is over. Otherwise, return the currently
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active window."
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(or (catch 'found
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(let* ((window (if mouse-wheel-follow-mouse
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(mwheel-event-window event)
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(selected-window)))
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(frame (when (window-live-p window)
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(frame-parameter
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(window-frame window) 'mouse-wheel-frame))))
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(when (frame-live-p frame)
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(let* ((pos (mouse-absolute-pixel-position))
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(pos-x (car pos))
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(pos-y (cdr pos)))
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(walk-window-tree
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(lambda (window-1)
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(let ((edges (window-edges window-1 nil t t)))
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(when (and (<= (nth 0 edges) pos-x)
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(<= pos-x (nth 2 edges))
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(<= (nth 1 edges) pos-y)
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(<= pos-y (nth 3 edges)))
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(throw 'found window-1))))
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frame nil t)))))
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(mwheel-event-window event)))
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(defmacro mwheel--is-dir-p (dir button)
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(declare (debug (sexp form)))
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(let ((custom-var (intern (format "mouse-wheel-%s-event" dir)))
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;; N.B. that the direction `down' in a wheel event refers to
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;; the movement of the section of the buffer the window is
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;; displaying, that is to say, the direction `scroll-up' moves
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;; it in.
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(event (intern (format "wheel-%s" (cond ((eq dir 'up)
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'down)
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((eq dir 'down)
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'up)
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(t dir))))))
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(macroexp-let2 nil butsym button
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`(or (eq ,butsym ',event)
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;; We presume here `button' is never nil.
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(eq ,butsym ,custom-var)))))
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(defun mwheel-scroll (event &optional arg)
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"Scroll up or down according to the EVENT.
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This should be bound only to mouse buttons 4, 5, 6, and 7 on
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non-Windows systems.
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Optional argument ARG (interactively, prefix numeric argument) controls
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the step of horizontal scrolling.
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The variable `mouse-wheel-scroll-amount-horizontal' records the last
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value of ARG, and the command uses it in subsequent scrolls."
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(interactive (list last-input-event current-prefix-arg))
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(let* ((selected-window (selected-window))
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(scroll-window (mouse-wheel--get-scroll-window event))
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(old-point
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(and (eq scroll-window selected-window)
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(eq (car-safe transient-mark-mode) 'only)
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(window-point)))
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(mods
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(delq 'click (delq 'double (delq 'triple (event-modifiers event)))))
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(amt (assoc mods mouse-wheel-scroll-amount))
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saw-error)
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(unless (eq scroll-window selected-window)
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;; Mark window to be scrolled for redisplay.
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(select-window scroll-window 'mark-for-redisplay))
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;; Extract the actual amount or find the element that has no modifiers.
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(if amt (setq amt (cdr amt))
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(let ((list-elt mouse-wheel-scroll-amount))
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(while (consp (setq amt (pop list-elt))))))
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(if (floatp amt) (setq amt (1+ (truncate (* amt (window-height))))))
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(when (and mouse-wheel-progressive-speed (numberp amt))
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;; When the double-mouse-N comes in, a mouse-N has been executed already,
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;; So by adding things up we get a squaring up (1, 3, 6, 10, 15, ...).
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(setq amt (* amt (event-click-count event))))
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(when (numberp amt) (setq amt (* amt (event-line-count event))))
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(condition-case nil
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(unwind-protect
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(let ((button (event-basic-type event)))
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(cond ((and (eq amt 'hscroll) (mwheel--is-dir-p down button))
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(when (and (natnump arg) (> arg 0))
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(setq mouse-wheel-scroll-amount-horizontal arg))
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(funcall (if mouse-wheel-flip-direction
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mwheel-scroll-left-function
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mwheel-scroll-right-function)
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mouse-wheel-scroll-amount-horizontal))
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((mwheel--is-dir-p down button)
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(condition-case nil
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(funcall mwheel-scroll-down-function amt)
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;; Make sure we do indeed scroll to the beginning of
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;; the buffer.
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(beginning-of-buffer
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(unwind-protect
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(funcall mwheel-scroll-down-function)
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;; If the first scroll succeeded, then some scrolling
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;; is possible: keep scrolling til the beginning but
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;; do not signal an error. For some reason, we have
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;; to do it even if the first scroll signaled an
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;; error, because otherwise the window is recentered
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;; for a reason that escapes me. This problem seems
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;; to only affect scroll-down. --Stef
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(set-window-start (selected-window) (point-min))))))
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((and (eq amt 'hscroll) (mwheel--is-dir-p up button))
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(when (and (natnump arg) (> arg 0))
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(setq mouse-wheel-scroll-amount-horizontal arg))
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(funcall (if mouse-wheel-flip-direction
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mwheel-scroll-right-function
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mwheel-scroll-left-function)
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mouse-wheel-scroll-amount-horizontal))
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((mwheel--is-dir-p up button)
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(condition-case nil (funcall mwheel-scroll-up-function amt)
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;; Make sure we do indeed scroll to the end of the buffer.
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(end-of-buffer
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(while t (funcall mwheel-scroll-up-function)))))
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((mwheel--is-dir-p left button) ; for tilt scroll
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(when mouse-wheel-tilt-scroll
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(funcall (if mouse-wheel-flip-direction
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mwheel-scroll-right-function
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mwheel-scroll-left-function)
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amt)))
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((mwheel--is-dir-p right button) ; for tilt scroll
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(when mouse-wheel-tilt-scroll
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(funcall (if mouse-wheel-flip-direction
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mwheel-scroll-left-function
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mwheel-scroll-right-function)
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amt)))
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(t (error "Bad binding in mwheel-scroll"))))
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(if (eq scroll-window selected-window)
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;; If there is a temporarily active region, deactivate it if
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;; scrolling moved point.
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(when (and old-point (/= old-point (window-point)))
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;; Call `deactivate-mark' at the original position, so that
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;; the original region is saved to the X selection.
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(let ((new-point (window-point)))
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(goto-char old-point)
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(deactivate-mark)
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(goto-char new-point)))
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(select-window selected-window t)))
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;; Do not ding at buffer limits. Show a message instead.
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(beginning-of-buffer
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(message (error-message-string '(beginning-of-buffer)))
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(setq saw-error t))
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(end-of-buffer
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(message (error-message-string '(end-of-buffer)))
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(setq saw-error t)))
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(when (and (not saw-error)
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mouse-wheel-click-event mouse-wheel-inhibit-click-time)
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(if mwheel-inhibit-click-event-timer
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(cancel-timer mwheel-inhibit-click-event-timer)
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(add-hook 'pre-command-hook 'mwheel-filter-click-events))
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(setq mwheel-inhibit-click-event-timer
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(run-with-timer mouse-wheel-inhibit-click-time nil
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'mwheel-inhibit-click-timeout)))))
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(put 'mwheel-scroll 'scroll-command t)
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(defun mouse-wheel-text-scale (event)
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"Adjust font size of the default face according to EVENT.
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See also `text-scale-adjust'."
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(interactive (list last-input-event))
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(let ((selected-window (selected-window))
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(scroll-window (mouse-wheel--get-scroll-window event))
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(button (event-basic-type event)))
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(select-window scroll-window 'mark-for-redisplay)
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(unwind-protect
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(cond ((mwheel--is-dir-p down button)
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(text-scale-increase 1))
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((mwheel--is-dir-p up button)
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(text-scale-decrease 1)))
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(select-window selected-window))))
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(declare-function global-text-scale-adjust "face-remap.el" (increment))
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(defun mouse-wheel-global-text-scale (event)
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"Increase or decrease the global font size according to the EVENT.
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This invokes `global-text-scale-adjust', which see."
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(interactive (list last-input-event))
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(let ((button (event-basic-type event)))
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(cond ((mwheel--is-dir-p down button)
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(global-text-scale-adjust 1))
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((mwheel--is-dir-p up button)
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(global-text-scale-adjust -1)))))
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(defun mouse-wheel--add-binding (key fun)
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"Bind mouse wheel button KEY to function FUN.
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Save it for later removal by `mouse-wheel--remove-bindings'."
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(global-set-key key fun)
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(push (cons key fun) mouse-wheel--installed-bindings-alist))
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(defun mouse-wheel--remove-bindings ()
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"Remove all mouse wheel key bindings.
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This is a helper function for `mouse-wheel-mode'."
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(dolist (binding mouse-wheel--installed-bindings-alist)
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(let ((key (car binding))
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(fun (cdr binding)))
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(when (eq (lookup-key (current-global-map) key) fun)
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(global-unset-key key))))
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(setq mouse-wheel--installed-bindings-alist nil))
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(defun mouse-wheel--create-scroll-keys (binding event)
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"Return list of key vectors for BINDING and EVENT.
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BINDING is an element in `mouse-wheel-scroll-amount'. EVENT is
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an event used for scrolling, such as `mouse-wheel-down-event'."
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(let ((prefixes (list 'left-margin 'right-margin
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'left-fringe 'right-fringe
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'vertical-scroll-bar 'horizontal-scroll-bar
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'mode-line 'header-line)))
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(if (consp binding)
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;; With modifiers, bind only the buffer area (no prefix).
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(list `[(,@(car binding) ,event)])
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;; No modifier: bind also some non-buffer areas of the screen.
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(cons (vector event)
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(mapcar (lambda (prefix) (vector prefix event)) prefixes)))))
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|
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;;;###autoload
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(define-minor-mode mouse-wheel-mode
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|
"Toggle mouse wheel support (Mouse Wheel mode)."
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|
:init-value t
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|
:global t
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|
:group 'mouse
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|
;; Remove previous bindings, if any.
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|
(mouse-wheel--remove-bindings)
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|
;; Setup bindings as needed.
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|
(when mouse-wheel-mode
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|
(mouse-wheel--setup-bindings)))
|
|
|
|
(defun mouse-wheel--setup-bindings ()
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|
(dolist (binding mouse-wheel-scroll-amount)
|
|
(cond
|
|
;; Bindings for changing font size.
|
|
((and (consp binding) (eq (cdr binding) 'text-scale))
|
|
(dolist (event (list mouse-wheel-down-event mouse-wheel-up-event
|
|
'wheel-down 'wheel-up))
|
|
(when event
|
|
(mouse-wheel--add-binding `[,(append (car binding) (list event))]
|
|
'mouse-wheel-text-scale))))
|
|
((and (consp binding) (eq (cdr binding) 'global-text-scale))
|
|
(dolist (event (list mouse-wheel-down-event mouse-wheel-up-event
|
|
'wheel-down 'wheel-up))
|
|
(when event
|
|
(mouse-wheel--add-binding `[,(append (car binding) (list event))]
|
|
'mouse-wheel-global-text-scale))))
|
|
;; Bindings for scrolling.
|
|
(t
|
|
(dolist (event (list mouse-wheel-down-event mouse-wheel-up-event
|
|
mouse-wheel-left-event mouse-wheel-right-event
|
|
'wheel-down 'wheel-up 'wheel-left 'wheel-right))
|
|
(when event
|
|
(dolist (key (mouse-wheel--create-scroll-keys binding event))
|
|
(mouse-wheel--add-binding key 'mwheel-scroll))))))))
|
|
|
|
(when mouse-wheel-mode
|
|
(mouse-wheel--setup-bindings))
|
|
|
|
;;; Obsolete.
|
|
|
|
;;; Compatibility entry point
|
|
;; preloaded ;;;###autoload
|
|
(defun mwheel-install (&optional uninstall)
|
|
"Enable mouse wheel support."
|
|
(declare (obsolete mouse-wheel-mode "27.1"))
|
|
(mouse-wheel-mode (if uninstall -1 1)))
|
|
|
|
(defvar mwheel-installed-bindings nil)
|
|
(make-obsolete-variable 'mwheel-installed-bindings nil "28.1")
|
|
|
|
(defvar mwheel-installed-text-scale-bindings nil)
|
|
(make-obsolete-variable 'mwheel-installed-text-scale-bindings nil "28.1")
|
|
|
|
(provide 'mwheel)
|
|
|
|
;;; mwheel.el ends here
|