Simple adapter for adding legacy browsers rightclick menu commands.
此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.greasyfork.org/scripts/435215/986494/libCtxtMenu.js
// ==UserScript==
// ==UserLibrary==
// @name libCtxtMenu
// @namespace https://openuserjs.org/users/Anakunda
// @version 1.00.0
// @author Anakunda
// @license GPL-3.0-or-later
// @copyright 2021, Anakunda (https://openuserjs.org/users/Anakunda)
// ==/UserScript==
// ==/UserLibrary==
'use strict';
class ContextMenu {
constructor(id, create = true) {
if (!id) {
let dt = new Date().getTime();
this.id = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
const r = (dt + Math.random() * 16) % 16 | 0;
dt = Math.floor(dt / 16);
return (c == 'x' ? r : (r & 0x3 | 0x8)).toString(16);
});
}
if (!(this.new = (this.menu = document.body.querySelector(`menu[type="context"][id="${id}"]`)) == null)) return;
this.menu = document.createElement('MENU');
this.menu.type = 'context';
this.menu.id = id;
if (create) this.create();
}
create() {
if (this.menu.parentNode == null) document.body.append(this.menu);
}
destroy() {
if (this.menu.parentNode != null) this.menu.parentNode.removeChild(this.menu);
}
addItem(caption, callback) {
if (!this.new) return false;
console.assert(this.menu instanceof HTMLMenuElement);
const menuItem = document.createElement('MENUITEM');
if (caption) menuItem.label = caption; else return;
if (typeof callback == 'function') {
menuItem.type = 'command';
menuItem.onclick = evt => {
console.assert(this.target instanceof HTMLElement);
return this.target instanceof HTMLElement ? callback(this.target) : false; //callback.call(this.target, this.target)
};
}
this.menu.append(menuItem);
return true;
}
attach(element) {
if (!(element instanceof HTMLElement)) throw 'Invalid argument';
console.assert(this.menu instanceof HTMLMenuElement);
this.create();
element.setAttribute('contextmenu', this.menu.id);
element.oncontextmenu = evt => { this.target = evt.currentTarget };
}
detach(element) {
if (!(element instanceof HTMLElement)) throw 'Invalid argument';
console.assert(this.menu instanceof HTMLMenuElement);
if (element.getAttribute('contextmenu') != this.menu.id) return;
element.oncontextmenu = null;
element.removeAttribute('contextmenu');
}
}