Auto Scroll Pages (double click / ctrl+arrow / alt+arrow)
// ==UserScript==
// @name Auto Scroll 自动滚屏
// @description Auto Scroll Pages (double click / ctrl+arrow / alt+arrow)
// @include *
// @version 0.17
// @author Erimus
// @grant none
// @namespace https://greasyfork.org/users/46393
// ==/UserScript==
(function(document) {
// speed controlled by the following 2 variables
let scroll_interval = 15, // every xx ms
scroll_distance = 1 // move xx pixel
let scrolling = false, // status
auto_scroll, // scroll function
last_click = Date.now()
// main function
let toggle_scroll = function(dire) {
scrolling = !scrolling
if (scrolling) {
console.log('Start scroll', dire)
dire = dire == 'up' ? -1 : 1
auto_scroll = setInterval(function() {
document.documentElement.scrollTop += (dire * scroll_distance)
}, scroll_interval)
} else {
console.log('Stop scroll')
clearInterval(auto_scroll)
}
}
// double click near edge can trigger (Prevent accidental touch)
// 双击靠近边缘的位置可以触发滚屏 (防止误触发)
let dblclick_check = function(e) {
if (Date.now() - last_click < 500) { return } //just stopped by click
let range = 50 // effective range
let w = window.innerWidth
let h = window.innerHeight
console.log('double click: x' + e.x + '/' + w + '| y' + e.y + '/' + h)
// Except top edge, because of search bar is mostly at top.
if (e.x < range || w - e.x < range || h - e.y < range) {
toggle_scroll()
}
}
// toogle scrolling by double click
// if you want to trigger with double click , remove '//' before 'document'.
// 你想用双击触发，删除下一行前的 '//'。
document.body.addEventListener('dblclick', dblclick_check)
// single click to stop scroll
document.body.addEventListener('click', function() {
if (scrolling) {
scrolling = false
console.log('Stop scroll')
clearInterval(auto_scroll)
last_click = Date.now()
}
})
// toogle scrolling by hotkey
// if you want set your own hotkey, find the key code on following site.
// 如果你想要设置其它快捷键，查看以下网址以找到对应的按键码。
// https://www.w3.org/2002/09/tests/keys.html
document.onkeydown = function(e) {
let keyCode = e.keyCode || e.which || e.charCode,
fnKey = e.ctrlKey || e.metaKey || e.altKey
if (fnKey && keyCode == 40) {
console.log('Press Ctrl/Alt + Down arrow')
toggle_scroll()
} else if (fnKey && keyCode == 38) {
console.log('Press Ctrl/Alt + Up arrow')
toggle_scroll('up')
}
}
})(document)