// Copyright 2015 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. import 'package:flutter/material.dart'; import '../../gallery/demo.dart'; const List<String> _defaultMaterials = <String>[ 'poker', 'tortilla', 'fish and', 'micro', 'wood', ]; const List<String> _defaultActions = <String>[ 'flake', 'cut', 'fragment', 'splinter', 'nick', 'fry', 'solder', 'cash in', 'eat', ]; const Map<String, String> _results = <String, String>{ 'flake': 'flaking', 'cut': 'cutting', 'fragment': 'fragmenting', 'splinter': 'splintering', 'nick': 'nicking', 'fry': 'frying', 'solder': 'soldering', 'cash in': 'cashing in', 'eat': 'eating', }; const List<String> _defaultTools = <String>[ 'hammer', 'chisel', 'fryer', 'fabricator', 'customer', ]; const Map<String, String> _avatars = <String, String>{ 'hammer': 'people/square/ali.png', 'chisel': 'people/square/sandra.png', 'fryer': 'people/square/trevor.png', 'fabricator': 'people/square/stella.png', 'customer': 'people/square/peter.png', }; final Map<String, Set<String>> _toolActions = <String, Set<String>>{ 'hammer': Set<String>()..addAll(<String>['flake', 'fragment', 'splinter']), 'chisel': Set<String>()..addAll(<String>['flake', 'nick', 'splinter']), 'fryer': Set<String>()..addAll(<String>['fry']), 'fabricator': Set<String>()..addAll(<String>['solder']), 'customer': Set<String>()..addAll(<String>['cash in', 'eat']), }; final Map<String, Set<String>> _materialActions = <String, Set<String>>{ 'poker': Set<String>()..addAll(<String>['cash in']), 'tortilla': Set<String>()..addAll(<String>['fry', 'eat']), 'fish and': Set<String>()..addAll(<String>['fry', 'eat']), 'micro': Set<String>()..addAll(<String>['solder', 'fragment']), 'wood': Set<String>()..addAll(<String>['flake', 'cut', 'splinter', 'nick']), }; class _ChipsTile extends StatelessWidget { const _ChipsTile({ Key key, this.label, this.children, }) : super(key: key); final String label; final List<Widget> children; // Wraps a list of chips into a ListTile for display as a section in the demo. @override Widget build(BuildContext context) { final List<Widget> cardChildren = <Widget>[ Container( padding: const EdgeInsets.only(top: 16.0, bottom: 4.0), alignment: Alignment.center, child: Text(label, textAlign: TextAlign.start), ), ]; if (children.isNotEmpty) { cardChildren.add(Wrap( children: children.map<Widget>((Widget chip) { return Padding( padding: const EdgeInsets.all(2.0), child: chip, ); }).toList())); } else { final TextStyle textStyle = Theme.of(context).textTheme.caption.copyWith(fontStyle: FontStyle.italic); cardChildren.add( Semantics( container: true, child: Container( alignment: Alignment.center, constraints: const BoxConstraints(minWidth: 48.0, minHeight: 48.0), padding: const EdgeInsets.all(8.0), child: Text('None', style: textStyle), ), )); } return Card( semanticContainer: false, child: Column( mainAxisSize: MainAxisSize.min, children: cardChildren, ) ); } } class ChipDemo extends StatefulWidget { static const String routeName = '/material/chip'; @override _ChipDemoState createState() => _ChipDemoState(); } class _ChipDemoState extends State<ChipDemo> { _ChipDemoState() { _reset(); } final Set<String> _materials = Set<String>(); String _selectedMaterial = ''; String _selectedAction = ''; final Set<String> _tools = Set<String>(); final Set<String> _selectedTools = Set<String>(); final Set<String> _actions = Set<String>(); bool _showShapeBorder = false; // Initialize members with the default data. void _reset() { _materials.clear(); _materials.addAll(_defaultMaterials); _actions.clear(); _actions.addAll(_defaultActions); _tools.clear(); _tools.addAll(_defaultTools); _selectedMaterial = ''; _selectedAction = ''; _selectedTools.clear(); } void _removeMaterial(String name) { _materials.remove(name); if (_selectedMaterial == name) { _selectedMaterial = ''; } } void _removeTool(String name) { _tools.remove(name); _selectedTools.remove(name); } String _capitalize(String name) { assert(name != null && name.isNotEmpty); return name.substring(0, 1).toUpperCase() + name.substring(1); } // This converts a String to a unique color, based on the hash value of the // String object. It takes the bottom 16 bits of the hash, and uses that to // pick a hue for an HSV color, and then creates the color (with a preset // saturation and value). This means that any unique strings will also have // unique colors, but they'll all be readable, since they have the same // saturation and value. Color _nameToColor(String name) { assert(name.length > 1); final int hash = name.hashCode & 0xffff; final double hue = (360.0 * hash / (1 << 15)) % 360.0; return HSVColor.fromAHSV(1.0, hue, 0.4, 0.90).toColor(); } AssetImage _nameToAvatar(String name) { assert(_avatars.containsKey(name)); return AssetImage( _avatars[name], package: 'flutter_gallery_assets', ); } String _createResult() { if (_selectedAction.isEmpty) { return ''; } return _capitalize(_results[_selectedAction]) + '!'; } @override Widget build(BuildContext context) { final List<Widget> chips = _materials.map<Widget>((String name) { return Chip( key: ValueKey<String>(name), backgroundColor: _nameToColor(name), label: Text(_capitalize(name)), onDeleted: () { setState(() { _removeMaterial(name); }); }, ); }).toList(); final List<Widget> inputChips = _tools.map<Widget>((String name) { return InputChip( key: ValueKey<String>(name), avatar: CircleAvatar( backgroundImage: _nameToAvatar(name), ), label: Text(_capitalize(name)), onDeleted: () { setState(() { _removeTool(name); }); }); }).toList(); final List<Widget> choiceChips = _materials.map<Widget>((String name) { return ChoiceChip( key: ValueKey<String>(name), backgroundColor: _nameToColor(name), label: Text(_capitalize(name)), selected: _selectedMaterial == name, onSelected: (bool value) { setState(() { _selectedMaterial = value ? name : ''; }); }, ); }).toList(); final List<Widget> filterChips = _defaultTools.map<Widget>((String name) { return FilterChip( key: ValueKey<String>(name), label: Text(_capitalize(name)), selected: _tools.contains(name) ? _selectedTools.contains(name) : false, onSelected: !_tools.contains(name) ? null : (bool value) { setState(() { if (!value) { _selectedTools.remove(name); } else { _selectedTools.add(name); } }); }, ); }).toList(); Set<String> allowedActions = Set<String>(); if (_selectedMaterial != null && _selectedMaterial.isNotEmpty) { for (String tool in _selectedTools) { allowedActions.addAll(_toolActions[tool]); } allowedActions = allowedActions.intersection(_materialActions[_selectedMaterial]); } final List<Widget> actionChips = allowedActions.map<Widget>((String name) { return ActionChip( label: Text(_capitalize(name)), onPressed: () { setState(() { _selectedAction = name; }); }, ); }).toList(); final ThemeData theme = Theme.of(context); final List<Widget> tiles = <Widget>[ const SizedBox(height: 8.0, width: 0.0), _ChipsTile(label: 'Available Materials (Chip)', children: chips), _ChipsTile(label: 'Available Tools (InputChip)', children: inputChips), _ChipsTile(label: 'Choose a Material (ChoiceChip)', children: choiceChips), _ChipsTile(label: 'Choose Tools (FilterChip)', children: filterChips), _ChipsTile(label: 'Perform Allowed Action (ActionChip)', children: actionChips), const Divider(), Padding( padding: const EdgeInsets.all(8.0), child: Center( child: Text( _createResult(), style: theme.textTheme.title, ), ), ), ]; return Scaffold( appBar: AppBar( title: const Text('Chips'), actions: <Widget>[ MaterialDemoDocumentationButton(ChipDemo.routeName), IconButton( onPressed: () { setState(() { _showShapeBorder = !_showShapeBorder; }); }, icon: const Icon(Icons.vignette, semanticLabel: 'Update border shape'), ) ], ), body: ChipTheme( data: _showShapeBorder ? theme.chipTheme.copyWith( shape: BeveledRectangleBorder( side: const BorderSide(width: 0.66, style: BorderStyle.solid, color: Colors.grey), borderRadius: BorderRadius.circular(10.0), )) : theme.chipTheme, child: ListView(children: tiles), ), floatingActionButton: FloatingActionButton( onPressed: () => setState(_reset), child: const Icon(Icons.refresh, semanticLabel: 'Reset chips'), ), ); } }