Updating the Chip demo in the Gallery to include all the new types of chips. (#16522)

This chip demo is more interactive than the last one, trying to exercise all of the types of chips for a demo that lets you select different types of "chips" (like tortilla, wood, micro, etc.), and then filter them and select an action on them.

examples/flutter_gallery/lib/demo/material/chip_demo.dart

@@ -4,6 +4,110 @@
 
 import 'package:flutter/material.dart';
 
+const List<String> _defaultMaterials = const <String>[
+  'poker',
+  'tortilla',
+  'fish and',
+  'micro',
+  'wood',
+];
+
+const List<String> _defaultActions = const <String>[
+  'flake',
+  'cut',
+  'fragment',
+  'splinter',
+  'nick',
+  'fry',
+  'solder',
+  'cash in',
+  'eat',
+];
+
+const Map<String, String> _results = const <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 = const <String>[
+  'hammer',
+  'chisel',
+  'fryer',
+  'fabricator',
+  'customer',
+];
+
+const Map<String, String> _avatars = const <String, String>{
+  'hammer': 'shrine/vendors/ali-connors.png',
+  'chisel': 'shrine/vendors/sandra-adams.jpg',
+  'fryer': 'shrine/vendors/zach.jpg',
+  'fabricator': 'shrine/vendors/peter-carlsson.png',
+  'customer': 'shrine/vendors/16c477b.jpg',
+};
+
+final Map<String, Set<String>> _toolActions = <String, Set<String>>{
+  'hammer': new Set<String>()..addAll(<String>['flake', 'fragment', 'splinter']),
+  'chisel': new Set<String>()..addAll(<String>['flake', 'nick', 'splinter']),
+  'fryer': new Set<String>()..addAll(<String>['fry']),
+  'fabricator': new Set<String>()..addAll(<String>['solder']),
+  'customer': new Set<String>()..addAll(<String>['cash in', 'eat']),
+};
+
+final Map<String, Set<String>> _materialActions = <String, Set<String>>{
+  'poker': new Set<String>()..addAll(<String>['cash in']),
+  'tortilla': new Set<String>()..addAll(<String>['fry', 'eat']),
+  'fish and': new Set<String>()..addAll(<String>['fry', 'eat']),
+  'micro': new Set<String>()..addAll(<String>['solder', 'fragment']),
+  'wood': new 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) {
+    return new ListTile(
+      title: new Padding(
+        padding: const EdgeInsets.only(top: 16.0, bottom: 4.0),
+        child: new Text(label, textAlign: TextAlign.start),
+      ),
+      subtitle: children.isEmpty
+          ? new Center(
+              child: new Padding(
+                padding: const EdgeInsets.all(8.0),
+                child: new Text(
+                  'None',
+                  style: Theme.of(context).textTheme.caption.copyWith(fontStyle: FontStyle.italic),
+                ),
+              ),
+            )
+          : new Wrap(
+              children: children
+                  .map((Widget chip) => new Padding(
+                        padding: const EdgeInsets.all(4.0),
+                        child: chip,
+                      ))
+                  .toList(),
+            ),
+    );
+  }
+}
+
 class ChipDemo extends StatefulWidget {
   static const String routeName = '/material/chip';
 
@@ -12,43 +116,205 @@ class ChipDemo extends StatefulWidget {
 }
 
 class _ChipDemoState extends State<ChipDemo> {
-  bool _showBananas = true;
+  _ChipDemoState() {
+    _reset();
+  }
 
-  void _deleteBananas() {
-    setState(() {
-      _showBananas = false;
-    });
+  final Set<String> _materials = new Set<String>();
+  String _selectedMaterial = '';
+  String _selectedAction = '';
+  final Set<String> _tools = new Set<String>();
+  final Set<String> _selectedTools = new Set<String>();
+  final Set<String> _actions = new 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);
+    return new HSVColor.fromAHSV(1.0, hue, 0.4, 0.90).toColor();
+  }
+
+  AssetImage _nameToAvatar(String name) {
+    assert(_avatars.containsKey(name));
+    return new 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 = <Widget>[
-      const Chip(
-        label: const Text('Apple')
-      ),
-      const Chip(
-        avatar: const CircleAvatar(child: const Text('B')),
-        label: const Text('Blueberry'),
+    final List<Widget> chips = _materials.map<Widget>((String name) {
+      return new Chip(
+        key: new ValueKey<String>(name),
+        backgroundColor: _nameToColor(name),
+        label: new Text(_capitalize(name)),
+        onDeleted: () {
+          setState(() {
+            _removeMaterial(name);
+          });
+        },
+      );
+    }).toList();
+
+    final List<Widget> inputChips = _tools.map<Widget>((String name) {
+      return new InputChip(
+          key: new ValueKey<String>(name),
+          avatar: new CircleAvatar(
+            backgroundImage: _nameToAvatar(name),
           ),
-    ];
+          label: new Text(_capitalize(name)),
+          onDeleted: () {
+            setState(() {
+              _removeTool(name);
+            });
+          });
+    }).toList();
+
+    final List<Widget> choiceChips = _materials.map<Widget>((String name) {
+      return new ChoiceChip(
+        key: new ValueKey<String>(name),
+        backgroundColor: _nameToColor(name),
+        label: new Text(_capitalize(name)),
+        selected: _selectedMaterial == name,
+        onSelected: (bool value) {
+          setState(() {
+            _selectedMaterial = value ? name : '';
+          });
+        },
+      );
+    }).toList();
+
+    final List<Widget> filterChips = _defaultTools.map<Widget>((String name) {
+      return new FilterChip(
+        key: new ValueKey<String>(name),
+        label: new 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();
 
-    if (_showBananas) {
-      chips.add(new Chip(
-        label: const Text('Bananas'),
-        onDeleted: _deleteBananas
-      ));
+    Set<String> allowedActions = new Set<String>();
+    if (_selectedMaterial != null && _selectedMaterial.isNotEmpty) {
+      for (String tool in _selectedTools) {
+        allowedActions.addAll(_toolActions[tool]);
+      }
+      allowedActions = allowedActions.intersection(_materialActions[_selectedMaterial]);
     }
 
-    return new Scaffold(
-      appBar: new AppBar(title: const Text('Chips')),
-      body: new ListView(
-        children: chips.map((Widget chip) {
-          return new Container(
-            height: 100.0,
-            child: new Center(child: chip)
+    final List<Widget> actionChips = allowedActions.map<Widget>((String name) {
+      return new ActionChip(
+        label: new Text(_capitalize(name)),
+        onPressed: () {
+          setState(() {
+            _selectedAction = name;
+          });
+        },
       );
-        }).toList()
+    }).toList();
+
+    final ThemeData theme = Theme.of(context);
+    final List<Widget> tiles = <Widget>[
+      const SizedBox(height: 8.0, width: 0.0),
+      new _ChipsTile(label: 'Available Materials (Chip)', children: chips),
+      new _ChipsTile(label: 'Available Tools (InputChip)', children: inputChips),
+      new _ChipsTile(label: 'Choose a Material (ChoiceChip)', children: choiceChips),
+      new _ChipsTile(label: 'Choose Tools (FilterChip)', children: filterChips),
+      new _ChipsTile(label: 'Perform Allowed Action (ActionChip)', children: actionChips),
+      const Divider(),
+      new Padding(
+        padding: const EdgeInsets.all(8.0),
+        child: new Center(
+          child: new Text(
+            _createResult(),
+            style: theme.textTheme.title,
+          ),
+        ),
+      ),
+    ];
+
+    return new Scaffold(
+      appBar: new AppBar(
+        title: const Text('Chips'),
+        actions: <Widget>[
+          new IconButton(
+            onPressed: () {
+              setState(() {
+                _showShapeBorder = !_showShapeBorder;
+              });
+            },
+            icon: const Icon(Icons.vignette),
           )
+        ],
+      ),
+      body: new ChipTheme(
+        data: _showShapeBorder
+            ? theme.chipTheme.copyWith(
+                shape: new BeveledRectangleBorder(
+                side: const BorderSide(width: 0.66, style: BorderStyle.solid, color: Colors.grey),
+                borderRadius: new BorderRadius.circular(10.0),
+              ))
+            : theme.chipTheme,
+        child: new ListView(children: tiles),
+      ),
+      floatingActionButton: new FloatingActionButton(
+        onPressed: () => setState(_reset),
+        child: const Icon(Icons.refresh),
+      ),
     );
   }
 }

packages/flutter/lib/src/material/circle_avatar.dart

@@ -146,7 +146,7 @@ class CircleAvatar extends StatelessWidget {
   Widget build(BuildContext context) {
     assert(debugCheckHasMediaQuery(context));
     final ThemeData theme = Theme.of(context);
-    TextStyle textStyle = theme.primaryTextTheme.title.copyWith(color: foregroundColor);
+    TextStyle textStyle = theme.primaryTextTheme.subhead.copyWith(color: foregroundColor);
     Color effectiveBackgroundColor = backgroundColor;
     if (effectiveBackgroundColor == null) {
       switch (ThemeData.estimateBrightnessForColor(textStyle.color)) {

packages/flutter/test/material/circle_avatar_test.dart

@@ -156,7 +156,7 @@ void main() {
       ),
     );
 
-    expect(tester.getSize(find.text('Z')), equals(const Size(20.0, 20.0)));
+    expect(tester.getSize(find.text('Z')), equals(const Size(16.0, 16.0)));
 
     await tester.pumpWidget(
       wrap(
@@ -185,7 +185,7 @@ void main() {
         ),
       ),
     );
-    expect(tester.getSize(find.text('Z')), equals(const Size(20.0, 20.0)));
+    expect(tester.getSize(find.text('Z')), equals(const Size(16.0, 16.0)));
   });
 
   testWidgets('CircleAvatar respects minRadius', (WidgetTester tester) async {