[JavaScript知识库]cocosCreator 事件系统

import { Dictionary } from "./Dictionary";

let eventMap: Dictionary<string, Array<any>> = new Dictionary<string, Array<any>>();

export default class EventManager {

    public static AddListener(eventName: string, callback: any, target: any) {
        let eventArr = eventMap.TryGetValue(eventName);
        if (eventArr == null) {
            eventArr = new Array<any>();
            eventMap.Add(eventName, eventArr);
        }
        eventArr.push({ callback: callback, target: target });
    }

    public static TriggerListener(eventName: string, ...parameter: any) {
        let eventArr = eventMap.TryGetValue(eventName);
        if (eventArr == null)
            return;
        for (let i = 0; i < eventArr.length; ++i) {
            let element: any = eventArr[i];
            if (element)
                element.callback.call(element.target, parameter);
        }
    }

    public static RemoveListener(eventName: string, callback: any) {
        let eventArr = eventMap.TryGetValue(eventName);
        if (eventArr == null)
            return;
        for (let i = 0; i < eventArr.length; ++i) {
            let element: any = eventArr[i];
            if (element && element.callback === callback) {
                eventArr[i] = undefined;
                break;
            }
        }
    }

    public static clear() {
    }

}

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