import { IGroup } from '@antv/g-base';
import { Event as GraphEvent } from '@antv/g-base';
import { LooseObject } from '../types';

/**
 *
 * @param group 分组
 * @param eventName 事件名
 * @param eventObject 事件对象
 */
export function propagationDelegate(group: IGroup, eventName: string, eventObject: LooseObject) {
  const event = new GraphEvent(eventName, eventObject);
  event.target = group;
  event.propagationPath.push(group); // 从当前 group 开始触发 delegation
  group.emitDelegation(eventName, event);
  let parent = group.getParent() as IGroup;
  // 执行冒泡
  while (parent) {
    // 委托事件要先触发
    parent.emitDelegation(eventName, event);
    event.propagationPath.push(parent);
    parent = parent.getParent() as IGroup;
  }
}