[Gallery] Fix directory structure (#312)

gallery/lib/demos/material/chip_demo.dart

@@ -0,0 +1,215 @@
+// Copyright 2019 The Flutter team. 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 'package:gallery/l10n/gallery_localizations.dart';
+
+enum ChipDemoType {
+  action,
+  choice,
+  filter,
+  input,
+}
+
+class ChipDemo extends StatelessWidget {
+  const ChipDemo({Key key, this.type}) : super(key: key);
+
+  final ChipDemoType type;
+
+  String _title(BuildContext context) {
+    switch (type) {
+      case ChipDemoType.action:
+        return GalleryLocalizations.of(context).demoActionChipTitle;
+      case ChipDemoType.choice:
+        return GalleryLocalizations.of(context).demoChoiceChipTitle;
+      case ChipDemoType.filter:
+        return GalleryLocalizations.of(context).demoFilterChipTitle;
+      case ChipDemoType.input:
+        return GalleryLocalizations.of(context).demoInputChipTitle;
+    }
+    return '';
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    Widget buttons;
+    switch (type) {
+      case ChipDemoType.action:
+        buttons = _ActionChipDemo();
+        break;
+      case ChipDemoType.choice:
+        buttons = _ChoiceChipDemo();
+        break;
+      case ChipDemoType.filter:
+        buttons = _FilterChipDemo();
+        break;
+      case ChipDemoType.input:
+        buttons = _InputChipDemo();
+        break;
+    }
+
+    return Scaffold(
+      appBar: AppBar(
+        automaticallyImplyLeading: false,
+        title: Text(_title(context)),
+      ),
+      body: buttons,
+    );
+  }
+}
+
+// BEGIN chipDemoAction
+
+class _ActionChipDemo extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return Center(
+      child: ActionChip(
+        onPressed: () {},
+        avatar: Icon(
+          Icons.brightness_5,
+          color: Colors.black54,
+        ),
+        label: Text(GalleryLocalizations.of(context).chipTurnOnLights),
+      ),
+    );
+  }
+}
+
+// END
+
+// BEGIN chipDemoChoice
+
+class _ChoiceChipDemo extends StatefulWidget {
+  @override
+  _ChoiceChipDemoState createState() => _ChoiceChipDemoState();
+}
+
+class _ChoiceChipDemoState extends State<_ChoiceChipDemo> {
+  int indexSelected = -1;
+
+  @override
+  Widget build(BuildContext context) {
+    return Center(
+      child: Wrap(
+        children: [
+          ChoiceChip(
+            label: Text(GalleryLocalizations.of(context).chipSmall),
+            selected: indexSelected == 0,
+            onSelected: (value) {
+              setState(() {
+                indexSelected = value ? 0 : -1;
+              });
+            },
+          ),
+          SizedBox(width: 8),
+          ChoiceChip(
+            label: Text(GalleryLocalizations.of(context).chipMedium),
+            selected: indexSelected == 1,
+            onSelected: (value) {
+              setState(() {
+                indexSelected = value ? 1 : -1;
+              });
+            },
+          ),
+          SizedBox(width: 8),
+          ChoiceChip(
+            label: Text(GalleryLocalizations.of(context).chipLarge),
+            selected: indexSelected == 2,
+            onSelected: (value) {
+              setState(() {
+                indexSelected = value ? 2 : -1;
+              });
+            },
+          ),
+        ],
+      ),
+    );
+  }
+}
+
+// END
+
+// BEGIN chipDemoFilter
+
+class _FilterChipDemo extends StatefulWidget {
+  @override
+  _FilterChipDemoState createState() => _FilterChipDemoState();
+}
+
+class _FilterChipDemoState extends State<_FilterChipDemo> {
+  bool isSelectedElevator = false;
+  bool isSelectedWasher = false;
+  bool isSelectedFireplace = false;
+
+  @override
+  Widget build(BuildContext context) {
+    final chips = [
+      FilterChip(
+        label: Text(GalleryLocalizations.of(context).chipElevator),
+        selected: isSelectedElevator,
+        onSelected: (value) {
+          setState(() {
+            isSelectedElevator = !isSelectedElevator;
+          });
+        },
+      ),
+      FilterChip(
+        label: Text(GalleryLocalizations.of(context).chipWasher),
+        selected: isSelectedWasher,
+        onSelected: (value) {
+          setState(() {
+            isSelectedWasher = !isSelectedWasher;
+          });
+        },
+      ),
+      FilterChip(
+        label: Text(GalleryLocalizations.of(context).chipFireplace),
+        selected: isSelectedFireplace,
+        onSelected: (value) {
+          setState(() {
+            isSelectedFireplace = !isSelectedFireplace;
+          });
+        },
+      ),
+    ];
+
+    return Center(
+      child: Wrap(
+        children: [
+          for (final chip in chips)
+            Padding(
+              padding: const EdgeInsets.all(4),
+              child: chip,
+            )
+        ],
+      ),
+    );
+  }
+}
+
+// END
+
+// BEGIN chipDemoInput
+
+class _InputChipDemo extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return Center(
+      child: InputChip(
+        onPressed: () {},
+        onDeleted: () {},
+        avatar: Icon(
+          Icons.directions_bike,
+          size: 20,
+          color: Colors.black54,
+        ),
+        deleteIconColor: Colors.black54,
+        label: Text(GalleryLocalizations.of(context).chipBiking),
+      ),
+    );
+  }
+}
+
+// END