import Vue from 'vue'
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// 导入组件
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import ContextMenu from './Box.vue'
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// 使用基础 Vue 构造器，创建一个“子类”
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const ContextMenuConstructor = Vue.extend(ContextMenu)
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let contextMenuInstance = null
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/**
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* 初始化右键菜单实例
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* @param {string} selectedFile 文件信息，如果此值为 undefined，证明是在空白触右键
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* @param {object} domEvent 当前右键点击的元素
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* @param {} serviceEl 调用当前服务的组件实例
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* @param {} callType 是否组件本身
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*/
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const initInstanceContextMenu = (
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selectedFile,
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domEvent,
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serviceEl,
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callType
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) => {
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contextMenuInstance = new ContextMenuConstructor({
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el: document.createElement('div'),
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data() {
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return {
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selectedFile,
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domEvent,
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serviceEl,
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callType
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}
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}
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})
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}
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/**
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* 右键菜单 Promise 函数
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* @returns {Promise} 抛出确认和取消回调函数
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*/
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const showContextMenuBox = (obj) => {
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// 非首次调用服务时，在 DOM 中移除上个实例
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if (contextMenuInstance !== null) {
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document.body.removeChild(contextMenuInstance.$el)
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}
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let { selectedFile, domEvent, serviceEl, callType } = obj
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return new Promise((reslove) => {
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initInstanceContextMenu(selectedFile, domEvent, serviceEl, callType)
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contextMenuInstance.callback = (res) => {
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reslove(res)
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// 服务取消时卸载 DOM
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if (res === 'cancel' && contextMenuInstance !== null) {
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document.body.removeChild(contextMenuInstance.$el)
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contextMenuInstance = null
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}
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}
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document.body.appendChild(contextMenuInstance.$el) // 挂载 DOM
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Vue.nextTick(() => {
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contextMenuInstance.handleOpenContextMenu() // 开始计算右键菜单需要显示的位置
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})
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})
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}
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// 添加关闭事件
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showContextMenuBox.close = () => {
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if (contextMenuInstance !== null) {
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document.body.removeChild(contextMenuInstance.$el)
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contextMenuInstance = null
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}
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}
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export default showContextMenuBox
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