55 lines
1.7 KiB
JavaScript
55 lines
1.7 KiB
JavaScript
/**
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* @author: winyuan
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* @data: 2019/07/16
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* @repository: https://github.com/winyuan
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* @description: edit mode: 鼠标拖动节点的交互(记录拖拽前后的数据，用于【撤销】和【重做】)
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*/
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// 用来获取调用此js的vue组件实例（this）
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let vm = null
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const sendThis = (_this) => {
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vm = _this
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}
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export default {
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sendThis, // 暴露函数
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name: 'drag-event-edit',
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options: {
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getEvents() {
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return {
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'node:dragstart': 'onNodeDragstart',
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'node:dragend': 'onNodeDragend'
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}
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},
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onNodeDragstart() {
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let graph = vm.graph
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this.historyData = JSON.stringify(graph.save())
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},
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onNodeDragend() {
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if (this.historyData) {
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let graph = this.graph
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// 如果当前点过【撤销】了，拖拽节点后没有【重做】功能
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// 重置undoCount，拖拽后的数据给(当前所在historyIndex + 1)，且清空这个时间点之后的记录
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if (vm.undoCount > 0) {
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vm.historyIndex = vm.historyIndex - vm.undoCount // 此时的historyIndex应当更新为【撤销】后所在的索引位置
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for (let i = 1; i <= vm.undoCount; i++) {
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let key = `graph_history_${vm.historyIndex + i}`
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vm.removeHistoryData(key)
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}
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vm.undoCount = 0
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} else {
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// 正常顺序执行的情况，记录拖拽前的数据状态
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let key = `graph_history_${vm.historyIndex}`
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vm.addHistoryData(key, this.historyData)
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}
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// 记录拖拽后的数据状态
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vm.historyIndex += 1
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let key = `graph_history_${vm.historyIndex}`
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let currentData = JSON.stringify(graph.save())
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vm.addHistoryData(key, currentData)
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}
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}
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}
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}
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