從邏輯角度避免多點觸控引起的bug

var evt = require("evt");

cc.Class({
    extends: cc.Component,

    properties: {
        val: -1,                    // 元素標識
        right_q_uid: -1,            // 正確的節點
        is_have_ref_node: true,     // true: 亂拖放,則cur_q_uid清爲-1,  false：表示cur_q_uid不清除，需要更新origin_pos
        cur_q_uid: -1,              // 表示沒有佔有任何坑
        origin_pos: cc.v2(0.0),  // 原始位置，沒有坑時，用於復位
        is_can_move: true,          // 是否可以移動,問題解答後，不可移動
        is_lock: false,
    },

    onLoad() {
        this.init_ref_pos();
        this.add_touch_event();
        this.init_event_manager();
    },

    onDestroy: function () {
        evt.getInstance().removeByNode(this);
    },

    on_start_event: function (event) {
        event.stopPropagation();
        if (!this.is_can_move) {
            return;
        }
        this.node.zIndex = 100;

        var time = new Date().getTime();
        this.touch_id = this.node._name + "_" + time;
        evt.getInstance().emit("check_touch_id", {});
    },

    on_move_event: function (event) {
        event.stopPropagation();
        if (!this.is_can_move) {
            return;
        }

        var w_pos = event.getLocation();
        var node_local_pos = this.node.parent.convertToNodeSpaceAR(w_pos);

        this.node.position = node_local_pos;
    },

    on_end_or_cancel_event: function (event) {
        event.stopPropagation();
        if (!this.is_can_move) {
            return;
        }
        this.node.zIndex = 0;

        var w_pos = event.getLocation();

        evt.getInstance().emit("match-drag-end", {
            val: this.val,
            cur_q_uid: this.cur_q_uid,
            w_pos: w_pos
        });

        evt.getInstance().emit("check_add_touch_event", {});

        this.touch_id = null;
    },

    init_ref_pos: function () {
        this.origin_pos = this.node.position; // 參考位置
    },

    reset_pos: function () {
        if (this.is_have_ref_node) {
            this.cur_q_uid = -1;
        }

        this.node.position = this.origin_pos;
        this.is_can_move = true;
    },

    add_touch_event: function () {
        this.node.on(cc.Node.EventType.TOUCH_START, this.on_start_event, this);
        this.node.on(cc.Node.EventType.TOUCH_MOVE, this.on_move_event, this);
        this.node.on(cc.Node.EventType.TOUCH_END, this.on_end_or_cancel_event, this);
        this.node.on(cc.Node.EventType.TOUCH_CANCEL, this.on_end_or_cancel_event, this);
    },

    remove_touch_event: function () {
        this.node.targetOff(this);
    },

    init_event_manager: function () {
        evt.getInstance().on("match-start-all-right", function (data, then) {
            then.is_can_move = false;
        }, this);

        evt.getInstance().on("check_touch_id", function (data, then) {
            if (!then.touch_id) {
                then.remove_touch_event();

            }
        }, this);

        evt.getInstance().on("check_add_touch_event", function (data, then) {
            if (!then.touch_id) {
                then.add_touch_event();
            }
        }, this);
    }
});