Gallery icons demo

examples/material_gallery/lib/demo/icons_demo.dart

+// Copyright 2016 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';
+
+class IconsDemo extends StatefulComponent {
+  IconsDemoState createState() => new IconsDemoState();
+}
+
+class IconsDemoState extends State<IconsDemo> {
+  static final List<Map<int, Color>> iconColorSwatches = <Map<int, Color>>[
+    Colors.red,
+    Colors.pink,
+    Colors.purple,
+    Colors.deepPurple,
+    Colors.indigo,
+    Colors.blue,
+    Colors.lightBlue,
+    Colors.cyan,
+    Colors.teal,
+    Colors.green,
+    Colors.lightGreen,
+    Colors.lime,
+    Colors.yellow,
+    Colors.amber,
+    Colors.orange,
+    Colors.deepOrange,
+    Colors.brown,
+    Colors.grey,
+    Colors.blueGrey
+  ];
+
+  int iconColorIndex = 2;
+  double iconOpacity = 1.0;
+
+  Color get iconColor => iconColorSwatches[iconColorIndex][400];
+
+  void handleIconButtonPress() {
+    setState(() {
+      iconColorIndex = (iconColorIndex + 1) % iconColorSwatches.length;
+    });
+  }
+
+  Widget buildIconButton(IconSize size, String name, bool enabled) {
+    return new IconButton(
+      size: size,
+      icon: name,
+      color: iconColor,
+      tooltip: "${enabled ? 'enabled' : 'disabled'} $name icon button",
+      onPressed: enabled ? handleIconButtonPress : null
+    );
+  }
+
+  Widget buildSizeLabel(int size, TextStyle style) {
+    return new SizedBox(
+      height: size.toDouble() + 16.0, // to match an IconButton's padded height
+      child: new Center(
+        child: new Text('$size', style: style)
+      )
+    );
+  }
+
+  Widget build(BuildContext context) {
+    final ThemeData theme = Theme.of(context);
+    final TextStyle textStyle = theme.text.subhead.copyWith(color: theme.text.caption.color);
+
+    return new Scaffold(
+      toolBar: new ToolBar(
+        center: new Text('Icons')
+      ),
+      body: new IconTheme(
+        data: new IconThemeData(opacity: iconOpacity),
+        child: new Padding(
+          padding: const EdgeDims.all(24.0),
+          child: new Column(
+            children: <Widget>[
+              new Row(
+                justifyContent: FlexJustifyContent.spaceBetween,
+                alignItems: FlexAlignItems.center,
+                children: <Widget>[
+                  new Flexible(
+                    flex: 0,
+                    child: new Column(
+                      alignItems: FlexAlignItems.center,
+                      children: <Widget>[
+                        new Text('Size', style: textStyle),
+                        buildSizeLabel(18, textStyle),
+                        buildSizeLabel(24, textStyle),
+                        buildSizeLabel(36, textStyle),
+                        buildSizeLabel(48, textStyle)
+                      ]
+                    )
+                  ),
+                  new Flexible(
+                    child: new Column(
+                      alignItems: FlexAlignItems.center,
+                      children: <Widget>[
+                        new Text('Enabled', style: textStyle),
+                        buildIconButton(IconSize.s18, 'action/face', true),
+                        buildIconButton(IconSize.s24, 'action/alarm', true),
+                        buildIconButton(IconSize.s36, 'action/home', true),
+                        buildIconButton(IconSize.s48, 'action/android', true)
+                      ]
+                    )
+                  ),
+                  new Flexible(
+                    child: new Column(
+                      alignItems: FlexAlignItems.center,
+                      children: <Widget>[
+                        new Text('Disabled', style: textStyle),
+                        buildIconButton(IconSize.s18, 'action/face', false),
+                        buildIconButton(IconSize.s24, 'action/alarm', false),
+                        buildIconButton(IconSize.s36, 'action/home', false),
+                        buildIconButton(IconSize.s48, 'action/android', false)
+                      ]
+                    )
+                  )
+                ]
+              ),
+              new Flexible(
+                child: new Center(
+                  child: new IconTheme(
+                    data: new IconThemeData(opacity: 1.0),
+                    child: new Row(
+                      justifyContent: FlexJustifyContent.center,
+                      children: <Widget>[
+                        new Icon(
+                          icon: 'image/brightness_7',
+                          color: iconColor.withAlpha(0x33) // 0.2 * 255 = 0x33
+                        ),
+                        new Slider(
+                          value: iconOpacity,
+                          min: 0.2,
+                          max: 1.0,
+                          activeColor: iconColor,
+                          onChanged: (double newValue) {
+                            setState(() {
+                              iconOpacity = newValue;
+                            });
+                          }
+                        ),
+                        new Icon(
+                          icon: 'image/brightness_7',
+                          color: iconColor.withAlpha(0xFF)
+                        ),
+                      ]
+                    )
+                  )
+                )
+              )
+            ]
+          )
+        )
+      )
+    );
+  }
+}

examples/material_gallery/lib/gallery/home.dart

@@ -18,6 +18,7 @@ import '../demo/dialog_demo.dart';
 import '../demo/drop_down_demo.dart';
 import '../demo/fitness_demo.dart';
 import '../demo/grid_list_demo.dart';
+import '../demo/icons_demo.dart';
 import '../demo/modal_bottom_sheet_demo.dart';
 import '../demo/page_selector_demo.dart';
 import '../demo/persistent_bottom_sheet_demo.dart';
@@ -104,6 +105,7 @@ class GalleryHomeState extends State<GalleryHome> {
                     new GalleryDemo(title: 'Expland/Collapse List Control', builder: () => new TwoLevelListDemo()),
                     new GalleryDemo(title: 'Floating Action Button', builder: () => new TabsFabDemo()),
                     new GalleryDemo(title: 'Grid', builder: () => new GridListDemo()),
+                    new GalleryDemo(title: 'Icons', builder: () => new IconsDemo()),
                     new GalleryDemo(title: 'Modal Bottom Sheet', builder: () => new ModalBottomSheetDemo()),
                     new GalleryDemo(title: 'Page Selector', builder: () => new PageSelectorDemo()),
                     new GalleryDemo(title: 'Persistent Bottom Sheet', builder: () => new PersistentBottomSheetDemo()),