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August 9, 2023 18:07
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Focus Ring - by Simon Lightfoot - 9th August 2023 - Humpday Q&A
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| // MIT License | |
| // | |
| // Copyright (c) 2023 Simon Lightfoot | |
| // | |
| // Permission is hereby granted, free of charge, to any person obtaining a copy | |
| // of this software and associated documentation files (the "Software"), to deal | |
| // in the Software without restriction, including without limitation the rights | |
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
| // copies of the Software, and to permit persons to whom the Software is | |
| // furnished to do so, subject to the following conditions: | |
| // | |
| // The above copyright notice and this permission notice shall be included in all | |
| // copies or substantial portions of the Software. | |
| // | |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
| // SOFTWARE. | |
| // | |
| import 'package:flutter/material.dart'; | |
| void main() { | |
| runApp(const MaterialApp( | |
| debugShowCheckedModeBanner: false, | |
| home: Home(), | |
| )); | |
| } | |
| @immutable | |
| class Home extends StatelessWidget { | |
| const Home({super.key}); | |
| @override | |
| Widget build(BuildContext context) { | |
| return Material( | |
| child: Padding( | |
| padding: const EdgeInsets.all(0.0), | |
| child: ListView.builder( | |
| itemBuilder: (BuildContext context, int index) { | |
| return FocusRing( | |
| child: ListTile( | |
| leading: Icon( | |
| IconData(0xe000 + index, fontFamily: 'MaterialIcons'), | |
| ), | |
| title: Text('Item #$index'), | |
| ), | |
| ); | |
| }, | |
| ), | |
| ), | |
| ); | |
| } | |
| } | |
| @immutable | |
| class FocusRing extends StatefulWidget { | |
| const FocusRing({ | |
| super.key, | |
| required this.child, | |
| }); | |
| final Widget child; | |
| @override | |
| State<FocusRing> createState() => _FocusRingState(); | |
| } | |
| class _FocusRingState extends State<FocusRing> | |
| with AutomaticKeepAliveClientMixin { | |
| @override | |
| bool get wantKeepAlive => true; | |
| bool _showDecoration = false; | |
| void _onFocusChange(bool focused) { | |
| setState(() => _showDecoration = focused); | |
| } | |
| @override | |
| Widget build(BuildContext context) { | |
| return Focus( | |
| onFocusChange: _onFocusChange, | |
| child: AnimatedContainer( | |
| duration: const Duration(milliseconds: 350), | |
| curve: Curves.easeInOut, | |
| foregroundDecoration: _showDecoration | |
| ? BoxDecoration( | |
| border: Border.all( | |
| color: Colors.lime.shade900, | |
| width: 3.0, | |
| ), | |
| borderRadius: const BorderRadius.all( | |
| Radius.circular(4.0), | |
| ), | |
| color: Colors.lime.withOpacity(0.3), | |
| ) | |
| : const BoxDecoration(), | |
| child: widget.child, | |
| ), | |
| ); | |
| } | |
| } |
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