Miigon's Youtube script

useful enhancements for my own youtube enjoyments
目前為 2023-06-24 提交的版本，檢視最新版本。
安裝腳本 ?
Wrap lines
// ==UserScript==
// @name         Miigon's Youtube script
// @namespace    https://blog.miigon.net/
// @version      0.2
// @description  useful enhancements for my own youtube enjoyments
// @author       Miigon
// @match        https://www.youtube.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=youtube.com
// @grant        none
// @license      MIT
// ==/UserScript==

/* Long press right arrow key to speed up video playback */
const RIGHT_ARROW_SPEEDUP_PRESS_TIME_MS = 500; // key hold time before speeding up
const SPEED_UP_PLAYBACK_RATE = 3;

(function() {
    'use strict';

    let mlog = (...args)=>{console.log("miigon's ytb script:", ...args)}

    let right_pressed = false;
    let is_speeding_up = false;
    let speeding_timeout = -1; // timeout waiting before starting speeding up
    let last_playback_rate = 1;

    let getPlayer = ()=>{return document.getElementsByClassName("html5-main-video")[0]}

    document.addEventListener("keydown", (e)=>{
        let used = false;
        if(e.miigon_ignore) {
            return;
        }

        if(e.key === "ArrowRight") {
            if(right_pressed == false){
                right_pressed = true;
                mlog("right pressed");
                speeding_timeout = setTimeout(()=>{
                    speeding_timeout = -1;
                    is_speeding_up = true;
                    let player = getPlayer();
                    last_playback_rate = player.playbackRate;
                    player.playbackRate = SPEED_UP_PLAYBACK_RATE;
                    mlog("speeding up");

                    used = true;
                }, RIGHT_ARROW_SPEEDUP_PRESS_TIME_MS);
            }
            used = true;
        }

        if(used){
            e.stopPropagation();
            e.preventDefault();
        }
    }, /*useCapture*/true);

    document.addEventListener("keyup", (e)=>{
        let used = false;

        if(e.key === "ArrowRight") {
            right_pressed = false;
            if(speeding_timeout != -1) { // keyup before speeding up begins
                clearTimeout(speeding_timeout);
                speeding_timeout = -1;

                // dispatch a normal right arrow keypress event.
                let event = new KeyboardEvent("keydown", {keyCode: 39})
                event.miigon_ignore = true; // the script should not process this event
                document.dispatchEvent(event);
            }
            if(is_speeding_up) { // keyup after speeding up begins
                is_speeding_up = false;
                mlog("stop speeding up");
                getPlayer().playbackRate = last_playback_rate;
                used = true;
            }
        }

        if(used){
            e.stopPropagation();
            e.preventDefault();
        }
    }, /*useCapture*/true);
})();
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