YouTube - Proper Description

Description below the video with proper open/close toggle, instead of a side bar.
目前为 2022-05-11 提交的版本。查看最新版本。
换行
// ==UserScript==
// @name         YouTube - Proper Description
// @namespace    q1k
// @version      1.1.0
// @description  Description below the video with proper open/close toggle, instead of a side bar.
// @author       q1k
// @match        *://www.youtube.com/*
// @grant        none
// @run-at       document-end
// ==/UserScript==

function findElement(selector) {
    return new Promise(function(resolve) {
        if (document.querySelector(selector)) {
            return resolve(document.querySelector(selector));
        }
        const observer = new MutationObserver(function(mutations) {
            if (document.querySelector(selector)) {
                resolve(document.querySelector(selector));
                observer.disconnect();
            }
        });
        observer.observe(document, {
            childList: true,
            subtree: true
        });
    });
}
function watchExistingButtonForChange(oldbutton, newbutton) {
    var mo = new MutationObserver(function(mutations) {
        if(oldbutton.innerText.trim().length>0) {
            newbutton.querySelector('.desc_text').innerText = oldbutton.innerText.replace("...","").trim();
            mo.disconnect();
        }
    });
    mo.observe(oldbutton, {
        childList: true,
        subtree: true,
        characterData: true
    });
}
var more, less, description;
var button_open, button_close;
function addSTUFF() {
    more = document.querySelector("#meta ytd-video-secondary-info-renderer ytd-expander #content ~ tp-yt-paper-button#more");
    less = document.querySelector("#meta ytd-video-secondary-info-renderer ytd-expander #content ~ tp-yt-paper-button#less");
    button_open = document.createElement("div");
    button_close = document.createElement("div");
    button_open.setAttribute("id","description_open");
    button_open.setAttribute("class","desc_toggles");
    button_close.setAttribute("id","description_close");
    button_close.setAttribute("class","desc_toggles");
    button_open.innerHTML = button_close.innerHTML = "<div class='desc_text more-button style-scope ytd-video-secondary-info-renderer'></div>";
    button_open.querySelector(".desc_text").innerText = more.innerText.replace("...","").trim();
    button_close.querySelector(".desc_text").innerText = less.innerText.replace("...","").trim();
    description = more.closest("ytd-expander");
    description.appendChild(button_open);
    description.appendChild(button_close);
    button_open.addEventListener('click', function(e) {
        description.removeAttribute("collapsed");
        more.setAttribute("hidden","");
        less.removeAttribute("hidden");
    });
    button_close.addEventListener('click', function(e) {
        description.setAttribute("collapsed","");
        less.setAttribute("hidden","");
        more.removeAttribute("hidden");
    });
    if(button_open.innerText.trim().length==0) {
        watchExistingButtonForChange(more, button_open);
    }
    if(button_close.innerText.trim().length==0) {
        watchExistingButtonForChange(less, button_close);
    }

    var styles = document.createElement("style");
    styles.innerHTML=`
[dark] #meta ytd-video-secondary-info-renderer, [dark] #primary #meta #description_open, [dark] #primary #meta #description_close { border-color: rgba(255,255,255,0.125); }
ytd-watch-metadata { display: none !important; }
#meta-contents[hidden], #info-contents[hidden]{ display: block !important; }
#meta tp-yt-paper-button#more, #meta tp-yt-paper-button#less, #meta ytd-expander[collapsed] #description_close, #meta ytd-expander:not([collapsed]) #description_open, #meta ytd-expander tp-yt-paper-button.ytd-expander[hidden] ~ tp-yt-paper-button.ytd-expander[hidden] ~ div.desc_toggles { display: none !important; }
#meta #description_open, #meta #description_close { display: inline-block; cursor: pointer; }
`;
/*    var styles_alt = document.createElement("style");
    styles_alt.innerHTML=`
#meta ytd-video-secondary-info-renderer, #primary #meta #description_open, #primary #meta #description_close { border-color: rgba(0,0,0,0.125); padding-bottom: 0; border-bottom: none; }

#meta ytd-expander.ytd-video-secondary-info-renderer, #meta ytd-expander.ytd-video-secondary-info-renderer > * { margin-left: 0; }
#meta #description_open, #meta #description_close { width: 100%; border-top: 1px solid; border-radius: 0; text-align: center; cursor: pointer; margin-top: 1em; background: linear-gradient(rgba(0,0,0,0.02), transparent); }
[dark] #meta #description_open, [dark] #meta #description_close { background: linear-gradient(rgba(255,255,255,0.02), transparent); }
#meta #description_open:hover, #meta #description_close:hover { background: rgba(0,0,0,0.03); }
[dark] #meta #description_open:hover, [dark] #meta #description_close:hover { background: rgba(255,255,255,0.03); }
#meta #description_open .desc_text, #meta #description_close .desc_text { margin: 0; padding: 4px; }
`;*/
    document.head.appendChild(styles);
}
findElement("ytd-expander #content ~ tp-yt-paper-button#more").then(function(el){
    addSTUFF();
});
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