team2_jj/assets/scripts/core/ui/drag/DragTarget.ts

import { Component, EventHandler, EventTouch, _decorator } from "cc";
import { DragSource } from "./DragSource";
import { DragSystem } from "./DragSystem";
const { ccclass, property } = _decorator;
/**
 * 可以释放拖拽的组件
 * @description 当拖拽的物体被放下时，会传递DragSource
 * @author 袁浩
 */
@ccclass("DragTarget")
export class DragTarget extends Component {
    @property({ tooltip: "所属分组" })
    public group: string = "group";
    @property({ tooltip: "当拖拽放下", type: EventHandler })
    public onDrop: EventHandler[] = [];
    @property({ tooltip: "当拖拽中", type: EventHandler })
    public onDraging: EventHandler[] = [];
    start() {
        DragSystem.addTarget(this);
    }
    onDestroy() {
        DragSystem.removeTarget(this);
    }
    public draging(source: DragSource, inTarget: boolean, event: EventTouch) {
        for (let i = 0; i < this.onDraging.length; i++) {
            this.onDraging[i] && this.onDraging[i].emit([source, inTarget, this, event]);
        }
    }
    public drop(source: DragSource, event: EventTouch) {
        for (let i = 0; i < this.onDrop.length; i++) {
            this.onDrop[i] && this.onDrop[i].emit([source, this, event]);
        }
    }
}