Robin E. R. Davies
54 lines
1.9 KiB
TypeScript
54 lines
1.9 KiB
TypeScript
// Copyright (c) 2022 Robin Davies
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of
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// this software and associated documentation files (the "Software"), to deal in
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// the Software without restriction, including without limitation the rights to
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// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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// the Software, and to permit persons to whom the Software is furnished to do so,
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// subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO `EVENT` SHALL THE AUTHORS OR
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// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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export type ObservableEventHandler<VALUE_TYPE> = (newValue: VALUE_TYPE) => void;
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export default class ObservableEvent<VALUE_TYPE> {
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private _on_event_handlers: ObservableEventHandler<VALUE_TYPE>[] = [];
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addEventHandler(handler: ObservableEventHandler<VALUE_TYPE> ) : void
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{
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this._on_event_handlers.push(handler);
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}
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removeEventHandler(handler: ObservableEventHandler<VALUE_TYPE> ) : void
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{
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let newArray: ObservableEventHandler<VALUE_TYPE>[] = [];
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for (let myHandler of this._on_event_handlers)
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{
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if (myHandler !== handler)
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{
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newArray.push(myHandler);
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}
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}
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this._on_event_handlers = newArray;
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}
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fire(value: VALUE_TYPE)
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{
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for (let handler of this._on_event_handlers)
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{
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handler(value);
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}
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}
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}; |