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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| /* | ||
| Copyright 2017 New Vector Ltd | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| import RoomViewStore from './stores/RoomViewStore'; | ||
|
|
||
| /** | ||
| * Consumes changes from the RoomViewStore and notifies specific things | ||
| * about when the active room changes. Unlike listening for RoomViewStore | ||
| * changes, you can subscribe to only changes relevant to a particular | ||
| * room. | ||
| * | ||
| * TODO: If we introduce an observer for something else, factor out | ||
| * the adding / removing of listeners & emitting into a common class. | ||
| */ | ||
| class ActiveRoomObserver { | ||
| constructor() { | ||
| this._listeners = {}; | ||
|
|
||
| this._activeRoomId = RoomViewStore.getRoomId(); | ||
| // TODO: We could self-destruct when the last listener goes away, or at least | ||
| // stop listening. | ||
| this._roomStoreToken = RoomViewStore.addListener(this._onRoomViewStoreUpdate.bind(this)); | ||
| } | ||
|
|
||
| addListener(roomId, listener) { | ||
| if (!this._listeners[roomId]) this._listeners[roomId] = []; | ||
| this._listeners[roomId].push(listener); | ||
| } | ||
|
|
||
| removeListener(roomId, listener) { | ||
| if (this._listeners[roomId]) { | ||
| const i = this._listeners[roomId].indexOf(listener); | ||
| if (i > -1) { | ||
| this._listeners[roomId].splice(i, 1); | ||
| } | ||
| } else { | ||
| console.warn("Unregistering unrecognised listener (roomId=" + roomId + ")"); | ||
| } | ||
| } | ||
|
|
||
| _emit(roomId) { | ||
| if (!this._listeners[roomId]) return; | ||
|
|
||
| for (const l of this._listeners[roomId]) { | ||
| l.call(); | ||
| } | ||
| } | ||
|
|
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| _onRoomViewStoreUpdate() { | ||
| // emit for the old room ID | ||
| if (this._activeRoomId) this._emit(this._activeRoomId); | ||
|
|
||
| // update our cache | ||
| this._activeRoomId = RoomViewStore.getRoomId(); | ||
|
|
||
| // and emit for the new one | ||
| if (this._activeRoomId) this._emit(this._activeRoomId); | ||
| } | ||
| } | ||
|
|
||
| if (global.mx_ActiveRoomObserver === undefined) { | ||
| global.mx_ActiveRoomObserver = new ActiveRoomObserver(); | ||
| } | ||
| export default global.mx_ActiveRoomObserver; |
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