92 lines
2.0 KiB
JavaScript
92 lines
2.0 KiB
JavaScript
class SEvent {
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constructor(eventName, isGetEvent) {
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if (!isGetEvent) {
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throw 'SEventError：get SEvent instance from SEvent.getEvent！'
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}
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this.handlers = []
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SEvent.events[eventName] = this
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}
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static getEvent(eventName) {
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SEvent.events = SEvent.events || {};
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const keys = Object.keys(SEvent.events)
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for (const key of keys) {
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if (key === eventName) {
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return SEvent.events[key]
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}
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}
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return new SEvent(eventName, true)
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}
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static removeEvent(eventName) {
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const keys = Object.keys(SEvent.events)
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for (const key of keys) {
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if (key === eventName) {
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SEvent.events[key].handlers = null
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delete SEvent.events[key]
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}
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}
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}
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static off(listenerId){
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for(const key of Object.keys(SEvent.events)){
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for(let i=0; i<SEvent.events[key].handlers.length; i++){
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if (listenerId === SEvent.events[key].handlers[i].id){
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SEvent.events[key].handlers.splice(i, 1)
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break
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}
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}
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}
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}
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on(handler) {
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if (handler && typeof (handler) === 'function') {
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this.handlers.push({
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id: SEvent.listenerId,
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handler
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})
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return SEvent.listenerId++
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}
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return 0
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}
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once(handler){
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const originHandler = handler
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handler = (args) => {
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originHandler(args)
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this.off(handler)
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}
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this.on(handler)
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}
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emit(args) {
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if (!(this.handlers && this.handlers.length)) return
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let l = this.handlers.length
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let i = 0
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while(i < this.handlers.length){
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this.handlers[i++].handler(...arguments)
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// 防止删除某些once事件的handler导致length改变
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if (this.handlers.length == l - 1) {
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i--
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l--
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}
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}
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}
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off(handler) {
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if (!(this.handlers && this.handlers.length)) return
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for (let i = 0; i < this.handlers.length; i++) {
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if (this.handlers[i].handler === handler) {
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this.handlers.splice(i, 1)
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break
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}
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}
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}
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}
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SEvent.listenerId = 1
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module.exports = SEvent
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