110 lines
4.1 KiB
JavaScript
110 lines
4.1 KiB
JavaScript
/*
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Copyright 2018 New Vector Ltd
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Copyright 2019 The Matrix.org Foundation C.I.C.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import EventEmitter from 'events';
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import {WidgetType} from "../widgets/WidgetType";
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/**
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* Acts as a place to get & set widget state, storing local echo state and
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* proxying through state from the js-sdk.
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*/
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class WidgetEchoStore extends EventEmitter {
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constructor() {
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super();
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this._roomWidgetEcho = {
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// Map as below. Object is the content of the widget state event,
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// so for widgets that have been deleted locally, the object is empty.
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// roomId: {
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// widgetId: [object]
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// }
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};
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}
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/**
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* Gets the widgets for a room, substracting those that are pending deletion.
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* Widgets that are pending addition are not included, since widgets are
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* represted as MatrixEvents, so to do this we'd have to create fake MatrixEvents,
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* and we don't really need the actual widget events anyway since we just want to
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* show a spinner / prevent widgets being added twice.
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*
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* @param {Room} roomId The ID of the room to get widgets for
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* @param {MatrixEvent[]} currentRoomWidgets Current widgets for the room
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* @returns {MatrixEvent[]} List of widgets in the room, minus any pending removal
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*/
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getEchoedRoomWidgets(roomId, currentRoomWidgets) {
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const echoedWidgets = [];
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const roomEchoState = Object.assign({}, this._roomWidgetEcho[roomId]);
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for (const w of currentRoomWidgets) {
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const widgetId = w.getStateKey();
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// If there's no echo, or the echo still has a widget present, show the *old* widget
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// we don't include widgets that have changed for the same reason we don't include new ones,
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// ie. we'd need to fake matrix events to do so and therte's currently no need.
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if (!roomEchoState[widgetId] || Object.keys(roomEchoState[widgetId]).length !== 0) {
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echoedWidgets.push(w);
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}
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delete roomEchoState[widgetId];
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}
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return echoedWidgets;
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}
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roomHasPendingWidgetsOfType(roomId, currentRoomWidgets, type: WidgetType) {
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const roomEchoState = Object.assign({}, this._roomWidgetEcho[roomId]);
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// any widget IDs that are already in the room are not pending, so
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// echoes for them don't count as pending.
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for (const w of currentRoomWidgets) {
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const widgetId = w.getStateKey();
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delete roomEchoState[widgetId];
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}
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// if there's anything left then there are pending widgets.
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if (type === undefined) {
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return Object.keys(roomEchoState).length > 0;
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} else {
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return Object.values(roomEchoState).some((widget) => {
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return type.matches(widget.type);
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});
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}
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}
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roomHasPendingWidgets(roomId, currentRoomWidgets) {
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return this.roomHasPendingWidgetsOfType(roomId, currentRoomWidgets);
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}
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setRoomWidgetEcho(roomId, widgetId, state) {
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if (this._roomWidgetEcho[roomId] === undefined) this._roomWidgetEcho[roomId] = {};
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this._roomWidgetEcho[roomId][widgetId] = state;
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this.emit('update');
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}
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removeRoomWidgetEcho(roomId, widgetId) {
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delete this._roomWidgetEcho[roomId][widgetId];
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if (Object.keys(this._roomWidgetEcho[roomId]).length === 0) delete this._roomWidgetEcho[roomId];
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this.emit('update');
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}
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}
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let singletonWidgetEchoStore = null;
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if (!singletonWidgetEchoStore) {
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singletonWidgetEchoStore = new WidgetEchoStore();
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}
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export default singletonWidgetEchoStore;
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