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/*
USAGE:
import { default as EmitterMixin, EmitterInterface } from './EmitterMixin'
in class:
on: EmitterInterface['on']
one: EmitterInterface['one']
off: EmitterInterface['off']
trigger: EmitterInterface['trigger']
triggerWith: EmitterInterface['triggerWith']
hasHandlers: EmitterInterface['hasHandlers']
after class:
EmitterMixin.mixInto(TheClass)
*/
import { applyAll } from '../util/misc'
import Mixin from './Mixin'
export interface EmitterInterface {
on(types, handler)
one(types, handler)
off(types, handler)
trigger(type, ...args)
triggerWith(type, context, args)
hasHandlers(type)
}
export default class EmitterMixin extends Mixin implements EmitterInterface {
_handlers: any
_oneHandlers: any
on(type, handler) {
addToHash(
this._handlers || (this._handlers = {}),
type,
handler
)
return this // for chaining
}
// todo: add comments
one(type, handler) {
addToHash(
this._oneHandlers || (this._oneHandlers = {}),
type,
handler
)
return this // for chaining
}
off(type, handler?) {
if (this._handlers) {
removeFromHash(this._handlers, type, handler)
}
if (this._oneHandlers) {
removeFromHash(this._oneHandlers, type, handler)
}
return this // for chaining
}
trigger(type, ...args) {
this.triggerWith(type, this, args)
return this // for chaining
}
triggerWith(type, context, args) {
if (this._handlers) {
applyAll(this._handlers[type], context, args)
}
if (this._oneHandlers) {
applyAll(this._oneHandlers[type], context, args)
delete this._oneHandlers[type] // will never fire again
}
return this // for chaining
}
hasHandlers(type) {
return (this._handlers && this._handlers[type] && this._handlers[type].length) ||
(this._oneHandlers && this._oneHandlers[type] && this._oneHandlers[type].length)
}
}
function addToHash(hash, type, handler) {
(hash[type] || (hash[type] = []))
.push(handler)
}
function removeFromHash(hash, type, handler?) {
if (handler) {
if (hash[type]) {
hash[type] = hash[type].filter(function(func) {
return func !== handler
})
}
} else {
delete hash[type] // remove all handler funcs for this type
}
}