Enable scroll mode for touchpad/mouse without/missing scroll/middle button when Ctrl + Space or Ctrl + Shift and touchpad/left touchpad button/left mouse button are pressed. Text selection is enabled for Ctrl + Shift.
Per
// ==UserScript==
// @name Scroll mode for touchpad/mouse without/missing scroll/middle button
// @author NWP
// @description Enable scroll mode for touchpad/mouse without/missing scroll/middle button when Ctrl + Space or Ctrl + Shift and touchpad/left touchpad button/left mouse button are pressed. Text selection is enabled for Ctrl + Shift.
// @namespace https://greasyfork.org/users/877912
// @version 0.1
// @license MIT
// @match *://*/*
// @grant none
// ==/UserScript==
(function() {
'use strict';
// Sensitivity factor determines the scroll speed relative to mouse movement.
// A higher value results in faster scrolling, while a lower value makes the scrolling slower.
// Example:
// - If sensitivity = 1.0, moving the mouse 100 pixels will scroll 100 pixels.
// - If sensitivity = 0.5, moving the mouse 100 pixels will scroll 50 pixels.
const sensitivity = 0.5;
let scrollModeEnabled = false;
let selectModeEnabled = false;
let initialMouseY = 0;
let scrollSpeed = 0;
let scrollInterval = null;
document.addEventListener('keydown', function(event) {
if (event.ctrlKey && event.code === 'Space' && !scrollModeEnabled) {
scrollModeEnabled = true;
document.body.style.cursor = 'ns-resize'; // Indicate scroll mode is active
disableTextSelection();
}
if (event.ctrlKey && event.shiftKey && !selectModeEnabled) {
selectModeEnabled = true;
document.body.style.cursor = 'ns-resize'; // Indicate select mode is active
enableTextSelection();
}
});
document.addEventListener('keyup', function(event) {
// Check specific keyup events to exit scroll mode
if (event.code === 'Space' || event.code === 'ControlLeft' || event.code === 'ControlRight') {
exitScrollMode();
}
// Check specific keyup events to exit select mode
if (event.code === 'ShiftLeft' || event.code === 'ShiftRight' || event.code === 'ControlLeft' || event.code === 'ControlRight') {
exitSelectMode();
}
});
document.addEventListener('mousedown', function(event) {
if (scrollModeEnabled && event.button === 0) {
initialMouseY = event.clientY; // Set initial position for scroll calculation
startAutoScroll();
}
if (selectModeEnabled && event.button === 0) {
initialMouseY = event.clientY; // Set initial position for scroll calculation
startAutoScroll();
}
});
document.addEventListener('mouseup', function(event) {
if (event.button === 0) {
exitScrollMode();
exitSelectMode();
}
});
document.addEventListener('mousemove', function(event) {
if ((scrollModeEnabled || selectModeEnabled) && scrollInterval) {
let currentMouseY = event.clientY;
scrollSpeed = (currentMouseY - initialMouseY) * sensitivity;
}
});
function startAutoScroll() {
if (!scrollInterval) {
scrollInterval = setInterval(function() {
window.scrollBy(0, scrollSpeed); // Scroll based on current calculated speed
}, 50);
}
}
function stopAutoScroll() {
if (scrollInterval) {
clearInterval(scrollInterval);
scrollInterval = null;
}
}
function exitScrollMode() {
if (scrollModeEnabled) {
scrollModeEnabled = false;
scrollSpeed = 0;
document.body.style.cursor = 'default';
enableTextSelection(); // Ensure text selection is enabled again
stopAutoScroll();
}
}
function exitSelectMode() {
if (selectModeEnabled) {
selectModeEnabled = false;
scrollSpeed = 0;
document.body.style.cursor = 'default';
stopAutoScroll();
}
}
function disableTextSelection() {
document.body.style.userSelect = 'none';
document.body.style.webkitUserSelect = 'none';
document.body.style.msUserSelect = 'none';
document.body.style.mozUserSelect = 'none';
}
function enableTextSelection() {
document.body.style.userSelect = '';
document.body.style.webkitUserSelect = '';
document.body.style.msUserSelect = '';
document.body.style.mozUserSelect = '';
}
})();