fix(google-maps): maintain subscriptions across event targets #20897
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crisbeto
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mbehrlich
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Oct 27, 2020
src/google-maps/map-event-manager.ts
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| @@ -18,11 +19,11 @@ export class MapEventManager { | |||
| /** Pending listeners that were added before the target was set. */ | |||
| private _pending: {observable: Observable<any>, observer: Subscriber<any>}[] = []; | |||
| private _listeners: google.maps.MapsEventListener[] = []; | |||
| private _target: MapEventManagerTarget; | |||
| private _targets = new BehaviorSubject<MapEventManagerTarget>(undefined); | |||
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I think this member name is a little confusing. It implies there are several targets at the same time, when in fact there is still just a single target.
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Also, should the type be BehaviorSubject<MapEventManagerTarget|undefined> ?
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My thinking with making it plural was that it's a "stream of targets", but since we don't follow the $ suffix convention for observables, there wasn't a better way to indicate it. I'll rename it.
As for the | undefined, it's not necessary since MapEventManagerTarget includes undefined already.
This came up during the review of angular#20873. Currently the class that manages events for the Google Maps objects assumes that once a target is assigned, it'll either be maintained or eventually removed which means that the fix from angular#20873 will cause any existing event listeners to be dropped. These changes add some code which will preserve the listeners. Furthermore, I've added a dedicated testing setup for the `MapEventManager` since there's a fair bit of logic encapsulated in it and we've only been testing it by proxy through the various Google Maps components.
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wagnermaciel
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This came up during the review of #20873. Currently the class that manages events for the Google Maps objects assumes that once a target is assigned, it'll either be maintained or eventually removed which means that the fix from #20873 will cause any existing event listeners to be dropped. These changes add some code which will preserve the listeners. Furthermore, I've added a dedicated testing setup for the `MapEventManager` since there's a fair bit of logic encapsulated in it and we've only been testing it by proxy through the various Google Maps components. (cherry picked from commit cc503c4)
wagnermaciel
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Oct 28, 2020
This came up during the review of #20873. Currently the class that manages events for the Google Maps objects assumes that once a target is assigned, it'll either be maintained or eventually removed which means that the fix from #20873 will cause any existing event listeners to be dropped. These changes add some code which will preserve the listeners. Furthermore, I've added a dedicated testing setup for the `MapEventManager` since there's a fair bit of logic encapsulated in it and we've only been testing it by proxy through the various Google Maps components. (cherry picked from commit cc503c4)
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This came up during the review of #20873. Currently the class that manages events for the Google Maps objects assumes that once a target is assigned, it'll either be maintained or eventually removed which means that the fix from #20873 will cause any existing event listeners to be dropped.
These changes add some code which will preserve the listeners.
Furthermore, I've added a dedicated testing setup for the
MapEventManagersince there's a fair bit of logic encapsulated in it and we've only been testing it by proxy through the various Google Maps components.