1// Copyright (C) 2023 The Android Open Source Project 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// http://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14 15export class SimpleResizeObserver implements Disposable { 16 private observer?: ResizeObserver; 17 18 constructor(dom: Element, callback: () => void) { 19 const observer = new ResizeObserver(() => { 20 callback(); 21 }); 22 observer.observe(dom); 23 this.observer = observer; 24 } 25 26 [Symbol.dispose]() { 27 if (this.observer) { 28 this.observer.disconnect(); 29 this.observer = undefined; 30 } 31 } 32} 33