Tmp store.

Author: Yuncong Zhang

Samples/UIWidgetsGallery/demo/material/chip_demo.cs

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+using UnityEngine;
+
+namespace UIWidgetsGallery.gallery {
+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',
+};
+
+const Map<String, Set<String>> _toolActions = <String, Set<String>>{
+  'hammer': <String>{'flake', 'fragment', 'splinter'},
+  'chisel': <String>{'flake', 'nick', 'splinter'},
+  'fryer': <String>{'fry'},
+  'fabricator': <String>{'solder'},
+  'customer': <String>{'cash in', 'eat'},
+};
+
+const Map<String, Set<String>> _materialActions = <String, Set<String>>{
+  'poker': <String>{'cash in'},
+  'tortilla': <String>{'fry', 'eat'},
+  'fish and': <String>{'fry', 'eat'},
+  'micro': <String>{'solder', 'fragment'},
+  'wood': <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 = <String>{};
+  String _selectedMaterial = '';
+  String _selectedAction = '';
+  final Set<String> _tools = <String>{};
+  final Set<String> _selectedTools = <String>{};
+  final Set<String> _actions = <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 = <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'),
+      ),
+    );
+  }
+}
+
+}