79 lines
2.1 KiB
JavaScript
79 lines
2.1 KiB
JavaScript
/*
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Copyright 2020 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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export class EventEmitter {
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constructor() {
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this._handlersByName = {};
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}
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emit(name, ...values) {
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const handlers = this._handlersByName[name];
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if (handlers) {
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for(const h of handlers) {
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h(...values);
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}
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}
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}
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on(name, callback) {
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let handlers = this._handlersByName[name];
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if (!handlers) {
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this._handlersByName[name] = handlers = new Set();
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}
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handlers.add(callback);
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return () => {
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this.off(name, callback);
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}
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}
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off(name, callback) {
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const handlers = this._handlersByName[name];
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if (handlers) {
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handlers.delete(callback);
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if (handlers.length === 0) {
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delete this._handlersByName[name];
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}
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}
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}
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}
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export class ViewModel extends EventEmitter {
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constructor(options) {
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super();
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this._options = options;
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}
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emitChange() {
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this.emit("change");
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}
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get request() { return this._options.request; }
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get origin() { return this._options.origin; }
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get openLink() { return this._options.openLink; }
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get platforms() { return this._options.platforms; }
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get preferences() { return this._options.preferences; }
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childOptions(options = {}) {
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return Object.assign({
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request: this.request,
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origin: this.origin,
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openLink: this.openLink,
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platforms: this.platforms,
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preferences: this.preferences,
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}, options);
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}
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}
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