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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 | 40x 47x 25x 47x 47x 47x 47x 47x 5x 5x 5x 5x 30x 29x 28x 28x 28x 1x 1x 2x 2x 1x 67x 67x 67x 2x 4x 67x 67x 71x 1x | export type EventBusListenerTag = string | number
export type EventBusListener<
TCallback extends (...args: any[]) => any = (...args: any[]) => any,
> = TCallback & {
__EVENT_BUS_TAG__?: EventBusListenerTag
}
export type EventBusOffListener = () => any
export type EventBusListeners = Record<string, EventBusListener>
export interface EventBusListenerDescriptor<
TListenerName extends keyof EventBusListeners,
> {
name: TListenerName
context?: any
tag?: EventBusListenerTag
}
export type EventBusBeforeOn<TListeners extends EventBusListeners> = {
[TListenerName in keyof TListeners]?: (
this: EventBus<TListeners>,
callback: EventBusListener<TListeners[TListenerName]>,
) => TListeners[TListenerName]
}
export type EventBusBeforeEmit<TListeners extends EventBusListeners> = {
[TListenerName in keyof TListeners]?: (
this: EventBus<TListeners>,
context: any,
) => any
}
export interface EventBusOptions<TListeners extends EventBusListeners> {
beforeOn?: EventBusBeforeOn<TListeners>
beforeEmit?: EventBusBeforeEmit<TListeners>
}
/**
* 事件巴士，管理事件的发布与订阅。
*
* @template TListeners 事件名称及其对应的回调描述
* @example
* ```typescript
* const bus = new EventBus<{
* success: (payload: { message: string }) => any
* }>()
* bus.on('success', ({ message }) => console.log(message))
* bus.emit('success', { message: '提交成功' })
* // => 控制台输出: 提交成功
* ```
*/
export class EventBus<TListeners extends EventBusListeners> {
/**
* 构造函数。
*/
constructor(private options?: EventBusOptions<TListeners>) {}
/**
* 回调列表。
*/
private callbacks: {
[TListenerName in keyof TListeners]: Array<TListeners[TListenerName]>
} = Object.create(null)
/**
* 订阅事件。
*
* @param eventName 事件名称
* @param callback 事件触发回调
* @returns 返回取消订阅的函数
*/
on<TListenerName extends keyof TListeners>(
eventName: TListenerName,
callback: TListeners[TListenerName],
): EventBusOffListener {
if (!this.callbacks[eventName]) {
this.callbacks[eventName] = []
}
callback =
this.options?.beforeOn?.[eventName]?.call(this, callback) ?? callback
const index = this.callbacks[eventName].indexOf(callback)
if (index === -1) {
this.callbacks[eventName].push(callback)
}
return () => this.off(eventName, callback)
}
/**
* 订阅事件，但只订阅一次即取消订阅。
*
* @param eventName 事件名称
* @param callback 事件触发回调
* @returns 返回取消订阅的函数
*/
once<TListenerName extends keyof TListeners>(
eventName: TListenerName,
callback: TListeners[TListenerName],
): EventBusOffListener {
const off = this.on(eventName, ((...args) => {
off()
callback(...args)
}) as TListeners[TListenerName])
return off
}
/**
* 取消订阅事件，若没有指定回调，则取消所有回调。
*
* @param eventName 事件名称
* @param callback 事件触发回调
*/
off<TListenerName extends keyof TListeners>(
eventName: TListenerName,
callbackOrTag?: TListeners[TListenerName] | string | number,
): void {
if (this.callbacks[eventName] && callbackOrTag) {
if (typeof callbackOrTag === 'function') {
const index = this.callbacks[eventName].indexOf(callbackOrTag)
if (index > -1) {
this.callbacks[eventName].splice(index, 1)
}
} else {
let index = this.callbacks[eventName].length
while (index--) {
if (
this.callbacks[eventName][index].__EVENT_BUS_TAG__ != null &&
this.callbacks[eventName][index].__EVENT_BUS_TAG__ === callbackOrTag
) {
this.callbacks[eventName].splice(index, 1)
}
}
}
} else {
delete this.callbacks[eventName]
}
}
/**
* 发布事件。
*
* @param eventNameAndContext 事件名称和上下文
* @param args 传给事件回调的参数
* @returns 返回各事件回调的返回结果组成的数组
*/
emit<TListenerName extends keyof TListeners>(
// @ts-ignore
eventName: TListenerName | EventBusListenerDescriptor<TListenerName>,
...args: Parameters<TListeners[TListenerName]>
): Array<ReturnType<TListeners[TListenerName]>> {
const {
name,
context,
tag,
}: {
name: TListenerName
context?: any
tag?: string | number
} =
typeof eventName === 'object'
? eventName
: {
name: eventName,
}
let callbacks = (this.callbacks[name] || []).slice()
if (tag != null) {
callbacks = callbacks.filter(
callback =>
callback.__EVENT_BUS_TAG__ != null &&
tag === callback.__EVENT_BUS_TAG__,
)
}
this.options?.beforeEmit?.[name]?.call(this, context)
return callbacks.map(callback => {
return callback.call(context, ...args)
})
}
/**
* 清空事件订阅。
*/
clear() {
this.callbacks = Object.create(null)
}
/**
* 销毁。
*/
destroy() {
// @ts-ignore
this.callbacks = null
}
}
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