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/*
* Copyright 2020 The Matrix.org Foundation C.I.C.
*
* 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.
*/
export type ObservableFunction<T> = (val: T) => void;
export class SimpleObservable<T> {
private listeners: ObservableFunction<T>[] = [];
public constructor(initialFn?: ObservableFunction<T>) {
if (initialFn) this.listeners.push(initialFn);
}
public onUpdate(fn: ObservableFunction<T>) {
this.listeners.push(fn);
}
public update(val: T) {
for (const listener of this.listeners) {
listener(val);
}
}
public close() {
this.listeners = []; // reset
}
}
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