gs-events/src/EventListenerOptions.js

事件分发器（同步）

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/// @Copyright ~2018 ☜Samlv9☞ and other contributors
/// @MIT-LICENSE | 1.0.0 | https://api.guless.com/
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import IEventDispatcher from "./IEventDispatcher";
import IEventListenerOptions from "./IEventListenerOptions";

/**
 * 定义侦听器配置选项。
 * @implements {IEventListenerOptions}
 * @see {@link EventListener}
 * @see {@link EventDispatcher}
 * @since 1.0.0
 */
export default class EventListenerOptions /*< implements IEventListenerOptions >*/ {
    /**
     * 创建一个侦听器选项对象。
     * 
     * @param {IEventDispatcher} [scope=null] - 指定侦听器的作用域对象。
     * @param {Boolean} [once=false] - 指示侦听器是否在执行后，自动从派发器中移除。
     * @param {Boolean} [useCapture=false] - 指示侦听器是否在捕获阶段处理事件。
     * @param {Number} [priority=0] - 指示侦听器在派发事件时的优先级（事件派发时会优先执行高优先级的侦听器）。
     * @since 1.0.0
     */
    constructor( scope = null, once = false, useCapture = false, priority = 0 ) {
        /**
         * @type {IEventDispatcher}
         */
        this._scope = scope;
        
        /**
         * @type {Boolean}
         */
        this._once = once;
        
        /**
         * @type {Boolean}
         */
        this._useCapture = useCapture;
        
        /**
         * @type {Number}
         */
        this._priority = priority;
    }
    
    /**
     * 获取侦听器的作用域对象。
     * @type {IEventDispatcher}
     * @since 1.0.0
     */
    get scope() {
        return this._scope;
    }
    
    /**
     * 指示侦听器是否在执行后，自动从派发器中移除。
     * @type {Boolean}
     * @since 1.0.0
     */
    get once() {
        return this._once;
    }
    
    /**
     * 指示侦听器是否在捕获阶段处理事件。
     * @type {Boolean}
     * @since 1.0.0
     */
    get useCapture() {
        return this._useCapture;
    }
    
    /**
     * 指示侦听器在派发事件时的优先级。
     * @type {Number}
     * @since 1.0.0
     */
    get priority() {
        return this._priority;
    }
    
    /**
     * 使用自定义的参数，初始化当前配置选项。
     * 
     * - 如果 `options` 是一个 `Boolean` 类型的值，则将 `options` 视为 {@link EventListenerOptions#useCapture}。
     * - 如果 `options` 是一个 `IEventListenerOptions` 类型的值，则拷贝 `options` 的值到当前配置选项中。
     * @param {Boolean|IEventListenerOptions} [options=false] - 指定侦听器的配置选项。
     * @example
     * const dispatcher = new EventDispatcher();
     * const options = new EventListenerOptions();
     * options.initWithParams({ "once": true, "scope": this });
     * 
     * dispatcher.addEventListener("custom", ( evt ) => {
     *     /// 该事件侦听器在执行后，会自动从 `dispatcher` 派发器中移除。
     *     console.log("success");
     * }, options);
     * 
     * dispatcher.dispatchEvent(new Event("custom", false, false));
     * @returns {this}
     * @since 1.0.0
     */
    initWithParams( options = false ) {
        if ( typeof options == "boolean" ) {
            this._useCapture = options;
        }
        
        else {
            if ( options.scope !== void 0 ) { this._scope = options.scope; }
            if ( options.once !== void 0 ) { this._once  = options.once; }
            if ( options.useCapture !== void 0 ) { this._useCapture = options.useCapture; }
            if ( options.priority !== void 0 ) { this._priority = options.priority; }
        }
        
        return this;
    }
}