widjet-disposables
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Lightweight disposable pattern implementation
216 lines (215 loc) • 6.2 kB
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<a href="index.html">All files</a> index.es6
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">export class Disposable {
constructor (block) {
if (!block) {
throw new Error('A Disposable must be created with a dispose callback')
}
this.block = block
}
dispose () {
if (this.block) {
this.block()
delete this.block
}
}
}
export class CompositeDisposable extends Disposable {
constructor (disposables = []) {
super(() => {
for (let i = 0; i < this.disposables.length; i++) {
const disposable = this.disposables[i]
disposable.dispose()
}
})
this.disposables = disposables
}
add (disposable) { this.disposables.push(disposable) }
remove (disposable) {
const index = this.disposables.indexOf(disposable)
<span class="missing-if-branch" title="else path not taken" >E</span>if (index !== -1) { this.disposables.splice(index, 1) }
}
}
export class DisposableEvent extends Disposable {
constructor (target, event, listener) {
const events = event.split(/\s+/g)
if (typeof target.addEventListener === 'function') {
super(() => events.forEach(e => target.removeEventListener(e, listener)))
events.forEach(e => target.addEventListener(e, listener))
} else <span class="missing-if-branch" title="else path not taken" >E</span>if (typeof target.on === 'function') {
super(() => events.forEach(e => target.off(e, listener)))
events.forEach(e => target.on(e, listener))
}
}
}
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