vue项目中使用bpmn-自定义platter的示例代码

export default class CustomPalette {
 constructor(create, elementFactory, palette) {
 this.create = create;
 this.elementFactory = elementFactory;
 palette.registerProvider(this);
 }
 
 
 // 这个是绘制palette的核心，函数名不要变
 getPaletteEntries() {
 const elementFactory = this.elementFactory;
 const create = this.create;
 
 function dragEventFactory(type) {
 return function (event) {
 const taskShape = elementFactory.create('shape', {
  type: type
 });
 create.start(event, taskShape);
 };
 }
 
 return {
 'create.cake': {
 title: '我是自定义节点-草莓蛋糕', // 鼠标悬浮到节点上显示的文字
 className: 'icon-custom bpmn-icon-cake', // 样式名
 action: { // 操作该节点时会触发的事件，此时只注册一个拖动事件即可，否则拖动时没有效果
  dragstart: dragEventFactory('bpmn:Task')
 }
 }
 };
 }
}
CustomPalette.$inject = [
 'create',
 'elementFactory',
 'palette'
];

import CustomPalette from './CustomPalette';
export default {
 __init__: ['customPalette']
 customPalette: ['type', CustomPalette],
};

import customModule from './customPalette';
export default {
 mounted() {
 this.containerEl = document.getElementById('container');
 this.bpmnModeler = new BpmnModeler({
 additionalModules: [ customModule ]
 });
}

.bpmn-icon-cake {
 background-image: url('./cake.png');
}
 
.icon-custom {
 background-size: 65%;
 background-repeat: no-repeat;
 background-position: center center;
}

import 'customPalette/customPalette.scss';

import BaseRenderer from 'diagram-js/lib/draw/BaseRenderer'; // 引入默认的renderer
 
const HIGH_PRIORITY = 1500; // 最高优先级
 
export default class CustomRenderer extends BaseRenderer {
 // 继承BaseRenderer
 constructor(eventBus, bpmnRenderer) {
 super(eventBus, HIGH_PRIORITY);
 this.bpmnRenderer = bpmnRenderer;
 }
 
 canRender(element) {
 return !element.labelTarget;
 }
 
 drawShape(parentNode, element) {
 const shape = this.bpmnRenderer.drawShape(parentNode, element);
 return shape;
 }
 
 getShapePath(shape) {
 return this.bpmnRenderer.getShapePath(shape);
 }
}
 
CustomRenderer.$inject = ['eventBus', 'bpmnRenderer'];

import cake from './cake.png';

// 自定义元素的类型，此时我们只需要自定义一种节点，所以数组只有一个元素
const customElements = ['bpmn:Task']; 
const customConfig = {
 // 自定义元素的配置
 cake: {
 url: cake,
 attr: {x: 0, y: 0, width: 50, height: 50}
 }
};
 
export {customElements, customConfig};

import { customElements, customConfig } from './util';
import { append as svgAppend, create as svgCreate } from 'tiny-svg';
...
drawShape(parentNode, element) {
 const type = element.type; // 获取到类型
 // 所有节点都会走这个函数，所以此时只限制，需要自定义的才去自定义，否则仍显示bpmn默认图标
 if (customElements.includes(type)) { 
 const {url, attr} = customConfig['cake'];
 const customIcon = svgCreate('image', {...attr, href: url});
 element['width'] = attr.width;
 element['height'] = attr.height;
 svgAppend(parentNode, customIcon);
 return customIcon;
 }
 const shape = this.bpmnRenderer.drawShape(parentNode, element);
 return shape;
}

import CustomPalette from './CustomPalette';
import CustomRenderer from './CustomRenderer';
 
export default {
 __init__: ['customPalette', 'customRenderer'],
 customPalette: ['type', CustomPalette],
 customRenderer: ['type', CustomRenderer]
};