| // Copyright 2021 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| /** |
| * This class wraps ChromeEvent listeners, adding some convenience |
| * functions. |
| */ |
| export class ChromeEventHandler { |
| /** |
| * @param {!ChromeEvent} chromeEvent |
| * @param {function(...)} callback |
| */ |
| constructor(chromeEvent, callback) { |
| /** @private {!ChromeEvent} */ |
| this.chromeEvent_ = chromeEvent; |
| |
| /** @private {function(...)} */ |
| this.callback_ = callback; |
| |
| /** @private {boolean} */ |
| this.listening_ = false; |
| } |
| |
| /** Starts listening to events. */ |
| start() { |
| if (this.listening_) { |
| return; |
| } |
| |
| this.listening_ = true; |
| this.chromeEvent_.addListener(this.callback_); |
| } |
| |
| /** Stops listening or handling future events. */ |
| stop() { |
| this.listening_ = false; |
| this.chromeEvent_.removeListener(this.callback_); |
| } |
| } |
