import { _decorator, Component, Node, Vec3, systemEvent, SystemEventType, macro, EventKeyboard, Enum } from 'cc';
const { ccclass, property } = _decorator;

export enum RenderDirection {
    x,
    y
}
export enum RenderSort {
    up,
    Down
}
/**
 * @description 深度排序，通过指定容器中的node节点Y值，自动更改node节点的渲染顺序（Y值小的遮挡Y值大的node对象）
 * @author 王锡铜、袁浩
 */
@ccclass('RenderTree')
export class RenderTree extends Component {
    @property({ type: Enum(RenderDirection), tooltip: "渲染方向" }) dir: RenderDirection = RenderDirection.y;
    @property({ type: Enum(RenderSort), tooltip: "渲染排序方式" }) sort: RenderSort = RenderSort.Down;

    update(deltaTime: number) {
        let tempArray = this.node.children.concat();
        let sortArray = [];
        if (this.dir == RenderDirection.y) {
            sortArray = tempArray.sort(function (a, b): number {
                if (a.position.y > b.position.y) {
                    return -1;
                } else {
                    return 1;
                }
            });
        } else {
            sortArray = tempArray.sort(function (a, b): number {
                if (a.position.x > b.position.x) {
                    return -1;
                } else {
                    return 1;
                }
            });
        }
        for (let i = 0; i < sortArray.length; i++) {
            sortArray[i].setSiblingIndex(this.sort == RenderSort.Down ? i : sortArray.length - i - 1);
        }
    }
}