/*
* Copyright (c) 2015 NAVER Corp.
* egjs projects are licensed under the MIT license
*/
import { isUndefined } from "./utils";
import { EventCallback, EventHash, EventKey, EventMap, EventTriggerParams } from "./types";
import ComponentEvent from "./ComponentEvent";
import ActualComponentEvent from "./ActualComponentEvent";
/**
* A class used to manage events in a component
* @ko 컴포넌트의 이벤트을 관리할 수 있게 하는 클래스
*/
class Component<T extends EventMap> {
/**
* Version info string
* @ko 버전정보 문자열
* @name VERSION
* @static
* @example
* Component.VERSION; // ex) 3.0.0
* @memberof Component
*/
public static VERSION: string = "#__VERSION__#";
private _eventHandler: { [keys: string]: Array<(...args: any[]) => any> };
/**
* @support {"ie": "7+", "ch" : "latest", "ff" : "latest", "sf" : "latest", "edge" : "latest", "ios" : "7+", "an" : "2.1+ (except 3.x)"}
*/
public constructor() {
this._eventHandler = {};
}
public trigger<K extends EventKey<T>>(event: ComponentEvent<T[K], K, this> & T[K]): this;
public trigger<K extends EventKey<T>>(event: K, ...params: EventTriggerParams<T, K>): this;
/**
* Trigger a custom event.
* @ko 커스텀 이벤트를 발생시킨다
* @param {string | ComponentEvent} event The name of the custom event to be triggered or an instance of the ComponentEvent<ko>발생할 커스텀 이벤트의 이름 또는 ComponentEvent의 인스턴스</ko>
* @param {any[]} params Event data to be sent when triggering a custom event <ko>커스텀 이벤트가 발생할 때 전달할 데이터</ko>
* @return An instance of the component itself<ko>컴포넌트 자신의 인스턴스</ko>
* @example
* ```ts
* import Component, { ComponentEvent } from "@egjs/component";
*
* class Some extends Component<{
* beforeHi: ComponentEvent<{ foo: number; bar: string }>;
* hi: { foo: { a: number; b: boolean } };
* someEvent: (foo: number, bar: string) => void;
* someOtherEvent: void; // When there's no event argument
* }> {
* some(){
* if(this.trigger("beforeHi")){ // When event call to stop return false.
* this.trigger("hi");// fire hi event.
* }
* }
* }
*
* const some = new Some();
* some.on("beforeHi", e => {
* if(condition){
* e.stop(); // When event call to stop, `hi` event not call.
* }
* // `currentTarget` is component instance.
* console.log(some === e.currentTarget); // true
*
* typeof e.foo; // number
* typeof e.bar; // string
* });
* some.on("hi", e => {
* typeof e.foo.b; // boolean
* });
* // If you want to more know event design. You can see article.
* // https://github.com/naver/egjs-component/wiki/How-to-make-Component-event-design%3F
* ```
*/
public trigger<K extends EventKey<T>>(event: K | ComponentEvent<T[K], K, this>, ...params: EventTriggerParams<T, K> | void[]): this {
const eventName = (event as any) instanceof ActualComponentEvent
? (event as ActualComponentEvent<T[K]>).eventType
: event as K;
const handlers = [...(this._eventHandler[eventName] || [])];
if (handlers.length <= 0) {
return this;
}
if ((event as any) instanceof ActualComponentEvent) {
(event as ActualComponentEvent<T[K]>).currentTarget = this;
handlers.forEach((handler: (event: ComponentEvent<T[K], K, this>) => any) => {
handler(event as ComponentEvent<T[K], K, this>);
});
} else {
handlers.forEach(handler => {
// eslint-disable-next-line @typescript-eslint/no-unsafe-call
handler(...params);
});
}
return this;
}
public once<K extends EventKey<T>>(eventName: K, handlerToAttach: EventCallback<T, K, this>): this;
public once(eventHash: EventHash<T, this>): this;
/**
* Executed event just one time.
* @ko 이벤트가 한번만 실행된다.
* @param {string} eventName The name of the event to be attached or an event name - event handler mapped object.<ko>등록할 이벤트의 이름 또는 이벤트 이름-핸들러 오브젝트</ko>
* @param {function} handlerToAttach The handler function of the event to be attached <ko>등록할 이벤트의 핸들러 함수</ko>
* @return An instance of the component itself<ko>컴포넌트 자신의 인스턴스</ko>
* @example
* ```ts
* import Component, { ComponentEvent } from "@egjs/component";
*
* class Some extends Component<{
* hi: ComponentEvent;
* }> {
* hi() {
* alert("hi");
* }
* thing() {
* this.once("hi", this.hi);
* }
* }
*
* var some = new Some();
* some.thing();
* some.trigger(new ComponentEvent("hi"));
* // fire alert("hi");
* some.trigger(new ComponentEvent("hi"));
* // Nothing happens
* ```
*/
public once<K extends EventKey<T>>(eventName: K | EventHash<T, this>, handlerToAttach?: EventCallback<T, K, this>): this {
if (typeof eventName === "object" && isUndefined(handlerToAttach)) {
const eventHash = eventName;
for (const key in eventHash) {
this.once((key as K), eventHash[key] as EventCallback<T, K, this>);
}
return this;
} else if (typeof eventName === "string" && typeof handlerToAttach === "function") {
const listener: any = (...args: any[]) => {
// eslint-disable-next-line @typescript-eslint/no-unsafe-call
handlerToAttach(...args);
this.off(eventName, listener);
};
this.on(eventName, listener);
}
return this;
}
/**
* Checks whether an event has been attached to a component.
* @ko 컴포넌트에 이벤트가 등록됐는지 확인한다.
* @param {string} eventName The name of the event to be attached <ko>등록 여부를 확인할 이벤트의 이름</ko>
* @return {boolean} Indicates whether the event is attached. <ko>이벤트 등록 여부</ko>
* @example
* ```ts
* import Component from "@egjs/component";
*
* class Some extends Component<{
* hi: void;
* }> {
* some() {
* this.hasOn("hi");// check hi event.
* }
* }
* ```
*/
public hasOn<K extends EventKey<T>>(eventName: K): boolean {
return !!this._eventHandler[eventName];
}
public on<K extends EventKey<T>>(eventName: K, handlerToAttach: EventCallback<T, K, this>): this;
public on(eventHash: EventHash<T, this>): this;
/**
* Attaches an event to a component.
* @ko 컴포넌트에 이벤트를 등록한다.
* @param {string} eventName The name of the event to be attached or an event name - event handler mapped object.<ko>등록할 이벤트의 이름 또는 이벤트 이름-핸들러 오브젝트</ko>
* @param {function} handlerToAttach The handler function of the event to be attached <ko>등록할 이벤트의 핸들러 함수</ko>
* @return An instance of a component itself<ko>컴포넌트 자신의 인스턴스</ko>
* @example
* ```ts
* import Component, { ComponentEvent } from "@egjs/component";
*
* class Some extends Component<{
* hi: void;
* }> {
* hi() {
* console.log("hi");
* }
* some() {
* this.on("hi",this.hi); //attach event
* }
* }
* ```
*/
public on<K extends EventKey<T>>(eventName: K | EventHash<T, this>, handlerToAttach?: EventCallback<T, K, this>): this {
if (typeof eventName === "object" && isUndefined(handlerToAttach)) {
const eventHash = eventName;
for (const name in eventHash) {
this.on(name, eventHash[name] as any);
}
return this;
} else if (typeof eventName === "string" &&
typeof handlerToAttach === "function") {
let handlerList = this._eventHandler[eventName];
if (isUndefined(handlerList)) {
this._eventHandler[eventName] = [];
handlerList = this._eventHandler[eventName];
}
handlerList.push(handlerToAttach as EventCallback<T, EventKey<T>, this>);
}
return this;
}
public off(eventHash?: EventHash<T, this>): this;
public off<K extends EventKey<T>>(eventName: K, handlerToDetach?: EventCallback<T, K, this>): this;
/**
* Detaches an event from the component.<br/>If the `eventName` is not given this will detach all event handlers attached.<br/>If the `handlerToDetach` is not given, this will detach all event handlers for `eventName`.
* @ko 컴포넌트에 등록된 이벤트를 해제한다.<br/>`eventName`이 주어지지 않았을 경우 모든 이벤트 핸들러를 제거한다.<br/>`handlerToAttach`가 주어지지 않았을 경우 `eventName`에 해당하는 모든 이벤트 핸들러를 제거한다.
* @param {string?} eventName The name of the event to be detached <ko>해제할 이벤트의 이름</ko>
* @param {function?} handlerToDetach The handler function of the event to be detached <ko>해제할 이벤트의 핸들러 함수</ko>
* @return An instance of a component itself <ko>컴포넌트 자신의 인스턴스</ko>
* @example
* ```ts
* import Component, { ComponentEvent } from "@egjs/component";
*
* class Some extends Component<{
* hi: void;
* }> {
* hi() {
* console.log("hi");
* }
* some() {
* this.off("hi",this.hi); //detach event
* }
* }
* ```
*/
public off<K extends EventKey<T>>(eventName?: K | EventHash<T, this>, handlerToDetach?: EventCallback<T, K, this>): this {
// Detach all event handlers.
if (isUndefined(eventName)) {
this._eventHandler = {};
return this;
}
// Detach all handlers for eventname or detach event handlers by object.
if (isUndefined(handlerToDetach)) {
if (typeof eventName === "string") {
delete this._eventHandler[eventName];
return this;
} else {
const eventHash = eventName;
for (const name in eventHash) {
this.off(name, eventHash[name] as any);
}
return this;
}
}
// Detach single event handler
const handlerList = this._eventHandler[eventName as K];
if (handlerList) {
let idx = 0;
for (const handlerFunction of handlerList) {
if (handlerFunction === handlerToDetach) {
handlerList.splice(idx, 1);
if (handlerList.length <= 0) {
delete this._eventHandler[eventName as K];
}
break;
}
idx++;
}
}
return this;
}
}
export default Component;
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