// Learn TypeScript:
//  - https://docs.cocos.com/creator/2.4/manual/en/scripting/typescript.html
// Learn Attribute:
//  - https://docs.cocos.com/creator/2.4/manual/en/scripting/reference/attributes.html
// Learn life-cycle callbacks:
//  - https://docs.cocos.com/creator/2.4/manual/en/scripting/life-cycle-callbacks.html


const { ccclass, property } = cc._decorator;

@ccclass
export default class MyComponent extends cc.Component {
    _eventMap = [];

    onLoad() {
        // super.onLoad();
        this.devicesFit();
    }
    //注册事件
    regEvent(type, callback, target = null, once = null) {
        cc.systemEvent.on(type, callback, target, once);
        this._eventMap.push({
            type: type,
            callback: callback,
            target: target,
            once: once
        });
    }
    regEventOnce(type, callback, target = null) {
        cc.systemEvent.once(type, callback, target);
        this._eventMap.push({
            type: type,
            callback: callback,
            target: target,
            once: null
        });
    }

    // 机型适配 子类重载
    devicesFit() {

    }

    onDestroy() {
        // super.onDestroy();
        for (let i = 0; i < this._eventMap.length; i++) {
            let data = this._eventMap[i];
            cc.systemEvent.off(data.type, data.callback, data.target);
        }
        delete this._eventMap;
        this.unscheduleAllCallbacks();
    }
}








export function Singleton<T>() {
    class Singleton {
        private static minst: any = null;
        public static get Inst(): T {
            if ((<any>this).minst == null) {
                (<any>this).minst = new (<any>this)()
                (<any>this).init()
            }
            return (<any>this).minst
        }

        constructor() {
        }
        public disp() {
            (<any>this).minst = null
        }
    }
    return Singleton
}