cc.Class({
    extends: cc.Component,
    /* --------------------------------segmentation-------------------------------- */
    onLoad() {
        this.content = this.node.getChildByName("view").getChildByName("content");
        // ------------------事件监听
        this.node.on("scrolling", this._event_update_opacity, this);
        this.content.on(cc.Node.EventType.CHILD_REMOVED, this._event_update_opacity, this);
        this.content.on(cc.Node.EventType.CHILD_REORDER, this._event_update_opacity, this);
    },

    /* ***************功能函数*************** */
    /**获取在世界坐标系下的节点包围盒(不包含自身激活的子节点范围) */
    _get_bounding_box_to_world(node_o_) {
        let w_n = node_o_._contentSize.width;
        let h_n = node_o_._contentSize.height;
        let rect_o = cc.rect(
            -node_o_._anchorPoint.x * w_n,
            -node_o_._anchorPoint.y * h_n,
            w_n,
            h_n
        );
        node_o_._calculWorldMatrix();
        rect_o.transformMat4(rect_o, node_o_._worldMatrix);
        return rect_o;
    },
    /**检测碰撞 */
    _check_collision(node_o_) {
        let rect1_o = this._get_bounding_box_to_world(this.content.parent);
        let rect2_o = this._get_bounding_box_to_world(node_o_);
        // ------------------保险范围
        rect1_o.width += rect1_o.width * 0.5;
        rect1_o.height += rect1_o.height * 0.5;
        rect1_o.x -= rect1_o.width * 0.25;
        rect1_o.y -= rect1_o.height * 0.25;
        return rect1_o.intersects(rect2_o);
    },
    /* ***************自定义事件*************** */
    _event_update_opacity() {
        this.content.children.forEach(v1_o => {
            v1_o.opacity = this._check_collision(v1_o) ? 255 : 0;
        });
    },
})