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Merge pull request #1166 from juanjoDiaz/simplify_EventTargetMixin

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Simplify EventTargetMixin
This commit is contained in:
Samuel Mannehed
2018-11-26 18:42:10 +01:00
committed by GitHub
parent ae1f7a8f5c 11ef53544f
commit 2bab9a0460
1 changed files with 6 additions and 11 deletions
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17
core/util/eventtarget.js
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@@ -8,13 +8,10 @@
export default class EventTargetMixin {
constructor() {
this._listeners = null;
this._listeners = new Map();
}
addEventListener(type, callback) {
if (!this._listeners) {
this._listeners = new Map();
}
if (!this._listeners.has(type)) {
this._listeners.set(type, new Set());
}
@@ -22,19 +19,17 @@ export default class EventTargetMixin {
}
removeEventListener(type, callback) {
if (!this._listeners || !this._listeners.has(type)) {
return;
if (this._listeners.has(type)) {
this._listeners.get(type).delete(callback);
}
this._listeners.get(type).delete(callback);
}
dispatchEvent(event) {
if (!this._listeners || !this._listeners.has(event.type)) {
if (!this._listeners.has(event.type)) {
return true;
}
this._listeners.get(event.type).forEach((callback) => {
callback.call(this, event);
}, this);
this._listeners.get(event.type)
.forEach(callback => callback.call(this, event), this);
return !event.defaultPrevented;
}
}