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| <!-- 参考:https://github.com/winily/bpmn-demo --> <template> <el-dialog title="流程设计" :visible.sync="dialogVisible" fullscreen :close-on-click-modal="false" @closed="$emit('close')" > <div style="position: relative;"> <!-- 创建一个canvas画布 npmn-js是通过canvas实现绘图的,并设置ref让vue获取到element --> <div class="bpmn-container"> <div ref="canvas" class="bpmn-canvas" /> <!-- 工具栏显示的地方 --> <div id="js-properties-panel" class="bpmn-js-properties-panel" /> </div>
<!-- 把操作按钮写在这里面 --> <div class="action"> <el-upload action class="upload-demo" :before-upload="openBpmn"> <el-button icon="el-icon-folder-opened" /> </el-upload> <el-button class="new" icon="el-icon-circle-plus" @click="newDiagram" /> <el-button icon="el-icon-download" @click="downloadBpmn" /> <el-button icon="el-icon-picture" @click="downloadSvg" /> <a ref="downloadLink" hidden /> </div> </div> </el-dialog> </template>
<script> import "bpmn-js/dist/assets/diagram-js.css"; import "bpmn-js/dist/assets/bpmn-font/css/bpmn.css"; import "bpmn-js/dist/assets/bpmn-font/css/bpmn-codes.css"; import "bpmn-js/dist/assets/bpmn-font/css/bpmn-embedded.css";
import BpmnModeler from "bpmn-js/lib/Modeler";
// 左边工具栏以及编辑节点的样式 import "bpmn-js-properties-panel/dist/assets/bpmn-js-properties-panel.css"; // 工具栏相关 import propertiesProviderModule from "bpmn-js-properties-panel/lib/provider/camunda"; import propertiesPanelModule from "bpmn-js-properties-panel"; import camundaModdleDescriptor from "camunda-bpmn-moddle/resources/camunda"; import camundaExtensionModule from "camunda-bpmn-moddle/lib";
// 汉化 import customTranslate from "./translate";
export default { data() { return { dialogVisible: true, bpmnModeler: null, canvas: null, bpmnTemplate: ` <?xml version="1.0" encoding="UTF-8"?> <definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:omgdc="http://www.omg.org/spec/DD/20100524/DC" xmlns:camunda="http://camunda.org/schema/1.0/bpmn" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:activiti="http://activiti.org/bpmn" id="m1577635100724" name="" targetNamespace="http://www.activiti.org/testm1577635100724" > <process id="process" processType="None" isClosed="false" isExecutable="true"> <extensionElements> <camunda:properties> <camunda:property name="a" value="1" /> </camunda:properties> </extensionElements> <startEvent id="_2" name="start" /> </process> <bpmndi:BPMNDiagram id="BPMNDiagram_leave"> <bpmndi:BPMNPlane id="BPMNPlane_leave" bpmnElement="leave"> <bpmndi:BPMNShape id="BPMNShape__2" bpmnElement="_2"> <omgdc:Bounds x="144" y="368" width="32" height="32" /> <bpmndi:BPMNLabel> <omgdc:Bounds x="149" y="400" width="23" height="14" /> </bpmndi:BPMNLabel> </bpmndi:BPMNShape> </bpmndi:BPMNPlane> </bpmndi:BPMNDiagram> </definitions> `, }; }, mounted() { this.$nextTick().then(() => this.init()); }, methods: { newDiagram() { this.createNewDiagram(this.bpmnTemplate); }, async downloadBpmn() { try { const { xml } = await this.bpmnModeler.saveXML({ format: true }); // 获取文件名 const name = `${this.getFilename(xml)}.bpmn`; // 将文件名以及数据交给下载方法 this.download({ name: name, data: xml }); } catch (err) { console.log("error rendering", err); } }, async downloadSvg() { try { const { xml } = await this.bpmnModeler.saveXML({ format: true }); // 获取文件名 const name = `${this.getFilename(xml)}.svg`;
// 从建模器画布中提取svg图形标签 let context = ""; const djsGroupAll = this.$refs.canvas.querySelectorAll(".djs-group"); for (const item of djsGroupAll) { context += item.innerHTML; } // 获取svg的基本数据,长宽高 const viewport = this.$refs.canvas.querySelector(".viewport").getBBox();
// 将标签和数据拼接成一个完整正常的svg图形 const svg = ` <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="${viewport.width}" height="${viewport.height}" viewBox="${viewport.x} ${viewport.y} ${viewport.width} ${viewport.height}" version="1.1" > ${context} </svg> `; // 将文件名以及数据交给下载方法 this.download({ name: name, data: svg }); } catch (err) { console.log("error rendering", err); } }, openBpmn(file) { const reader = new FileReader(); // 读取File对象中的文本信息,编码格式为UTF-8 reader.readAsText(file, "utf-8"); reader.onload = () => { // 读取完毕后将文本信息导入到Bpmn建模器 this.createNewDiagram(reader.result); }; return false; }, getFilename(xml) { const start = xml.indexOf("process"); let filename = xml.substr(start, xml.indexOf(">")); filename = filename.substr(filename.indexOf("id") + 4); filename = filename.substr(0, filename.indexOf('"')); return filename; }, download({ name = "diagram.bpmn", data }) { // 这里就获取到了之前设置的隐藏链接 const downloadLink = this.$refs.downloadLink; // 把数据转换为URI,下载要用到的 const encodedData = encodeURIComponent(data);
if (data) { // 将数据给到链接 downloadLink.href = "data:application/bpmn20-xml;charset=UTF-8," + encodedData; // 设置文件名 downloadLink.download = name; // 触发点击事件开始下载 downloadLink.click(); } }, async init() { // 获取画布 element this.canvas = this.$refs.canvas;
// 将汉化包装成一个模块 const customTranslateModule = { translate: ["value", customTranslate], };
// 创建Bpmn对象 this.bpmnModeler = new BpmnModeler({ // 设置bpmn的绘图容器为上门获取的画布 element container: this.canvas,
// 加入工具栏支持 propertiesPanel: { parent: "#js-properties-panel", }, additionalModules: [ // 工具栏模块 propertiesProviderModule, propertiesPanelModule, // camunda camundaExtensionModule, // 汉化模块 customTranslateModule, ], moddleExtensions: { camunda: camundaModdleDescriptor, }, });
await this.createNewDiagram(this.bpmnTemplate); }, async createNewDiagram(bpmn) { // 将字符串转换成图显示出来; try { await this.bpmnModeler.importXML(bpmn); } catch (err) { console.log( "打开模型出错,请确认该模型符合Bpmn2.0规范", err.message, err.warnings ); } }, }, }; </script>
<style> .bpmn-container { width: 100%; height: calc(100vh - 114px); display: flex; }
.bpmn-canvas { width: calc(100% - 300px); height: calc(100vh - 114px); }
.bpmn-js-properties-panel { width: 320px; height: inherit; overflow-y: auto; }
.action { position: absolute; bottom: 20px; left: 20px; display: flex; } .upload-demo { margin-right: 10px; } </style>
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