Support for background images on cards, style demo home

sky/sdk/home.dart

 // 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 'dart:sky';
 
 import 'package:mojom/intents/intents.mojom.dart';
 import 'package:sky/framework/shell.dart' as shell;
+import 'package:sky/painting/box_painter.dart';
 import 'package:sky/theme/colors.dart' as colors;
 import 'package:sky/theme/edges.dart';
 import 'package:sky/theme/typography.dart' as typography;
+import 'package:sky/widgets/card.dart';
+import 'package:sky/widgets/fixed_height_scrollable.dart';
+import 'package:sky/widgets/flat_button.dart';
 import 'package:sky/widgets/material.dart';
-import 'package:sky/widgets/raised_button.dart';
 import 'package:sky/widgets/scaffold.dart';
+import 'package:sky/widgets/theme.dart';
 import 'package:sky/widgets/tool_bar.dart';
 import 'package:sky/widgets/basic.dart';
 
 void launch(String relativeUrl) {
   Uri url = Uri.base.resolve(relativeUrl);
   url = url.replace(scheme: 'sky');
 
   ActivityManagerProxy activityManager = new ActivityManagerProxy.unbound();
   Intent intent = new Intent()
     ..action = 'android.intent.action.VIEW'
     ..url = url.toString();
   shell.requestService(null, activityManager);
   activityManager.ptr.startActivity(intent);
 }
 
-class SkyDemo extends Component {
-  String text;
+class SkyDemo {
+  String name;
   String href;
+  String description;
+  typography.TextTheme textTheme;
+  BoxDecoration decoration;
+  SkyDemo({ this.name, this.href, this.description, this.textTheme, this.decoration });
+}
 
-  SkyDemo(String text, this.href) : this.text = text, super(key: text);
+List<Widget> demos = [
+  new SkyDemo(
+    name: 'Stocks',
+    href: 'example/stocks/lib/main.dart',
+    description: 'Multi-screen app with scrolling list',
+    textTheme: typography.black,
+    decoration: new BoxDecoration(
+      backgroundImage: new BackgroundImage(
+        src: 'example/stocks/thumbnail.png',
+        fit: BackgroundFit.cover
+      )
+    )
+  ),
+  new SkyDemo(
+    name: 'Asteroids',
+    href: 'example/game/main.dart',
+    description: '2D game using sprite sheets to achieve high performance',
+    textTheme: typography.white,
+    decoration: new BoxDecoration(
+      backgroundImage: new BackgroundImage(
+        src: 'example/game/res/thumbnail.png',
+        fit: BackgroundFit.cover
+      )
+    )
+  ),
+  new SkyDemo(
+    name: 'Interactive Flex',
+    href: 'example/rendering/interactive_flex.dart',
+    description: 'Swipe to adjust the layout of the app',
+    textTheme: typography.white,
+    decoration: new BoxDecoration(
+      backgroundColor: const Color(0xFF0081C6)
+    )
+  ),
+  new SkyDemo(
+    name: 'Sector',
+    href: 'example/widgets/sector.dart',
+    description: 'Demo of alternative layouts',
+    textTheme: typography.black,
+    decoration: new BoxDecoration(
+      backgroundColor: colors.Black,
+      backgroundImage: new BackgroundImage(
+        src: 'example/widgets/sector_thumbnail.png',
+        fit: BackgroundFit.cover
+      )
+    )
+  ),
+  // new SkyDemo(
+  //   'Touch Demo', 'examples/rendering/touch_demo.dart', 'Simple example showing handling of touch events at a low level'),
+  new SkyDemo(
+    name: 'Minedigger Game',
+    href: 'example/mine_digger/mine_digger.dart',
+    description: 'Clone of the classic Minesweeper game',
+    textTheme: typography.white
+  ),
 
-  void _handlePress() {
-    launch(href);
+  // TODO(eseidel): We could use to separate these groups?
+  // new SkyDemo('Old Stocks App', 'examples/stocks/main.sky'),
+  // new SkyDemo('Old Touch Demo', 'examples/raw/touch-demo.sky'),
+  // new SkyDemo('Old Spinning Square', 'examples/raw/spinning-square.sky'),
+
+  // TODO(jackson): This doesn't seem to be working
+  // new SkyDemo('Licenses', 'LICENSES.sky'),
+];
+
+const double kCardHeight = 120.0;
+
+class DemoList extends FixedHeightScrollable {
+  DemoList({ String key }) : super(key: key, itemHeight: kCardHeight) {
+    itemCount = demos.length;
   }
 
-  Widget build() {
-    return new ConstrainedBox(
-      constraints: const BoxConstraints.expandWidth(),
-      child: new RaisedButton(
-        child: new Text(text),
-        onPressed: _handlePress
+  Widget buildDemo(SkyDemo demo) {
+    return new Listener(
+      key: demo.name,
+      onGestureTap: (_) => launch(demo.href),
+      child: new Container(
+        height: kCardHeight,
+        child: new Card(
+          child: new Flex([
+            new Flexible(
+              child: new Stack([
+                new Container(
+                  decoration: demo.decoration,
+                  child: new Container()
+                ),
+                new Container(
+                  margin: const EdgeDims.all(24.0),
+                  child: new Block([
+                    new Text(demo.name, style: demo.textTheme.title),
+                    new Text(demo.description, style: demo.textTheme.subhead)
+                  ])
+                )
+              ])
+            ),
+          ], direction: FlexDirection.vertical)
+        )
       )
     );
   }
+
+  List<Widget> buildItems(int start, int count) {
+    return demos
+      .skip(start)
+      .take(count)
+      .map(buildDemo)
+      .toList(growable: false);
+  }
 }
 
 class SkyHome extends App {
   Widget build() {
-    List<Widget> children = [
-      new SkyDemo('Stocks App', 'example/stocks/lib/main.dart'),
-      new SkyDemo('Asteroids Game', 'example/game/main.dart'),
-      new SkyDemo('Interactive Flex', 'example/rendering/interactive_flex.dart'),
-      new SkyDemo('Sector Layout', 'example/widgets/sector.dart'),
-      new SkyDemo('Touch Demo', 'example/rendering/touch_demo.dart'),
-      new SkyDemo('Minedigger Game', 'example/mine_digger/lib/main.dart'),
-
-      new SkyDemo('Licences (Old)', 'LICENSES.sky'),
-    ];
-
-    return new Scaffold(
-      toolbar: new ToolBar(
-          center: new Text('Sky Demos', style: typography.white.title),
-          backgroundColor: colors.Blue[500]),
-      body: new Material(
-        edge: MaterialEdge.canvas,
-        child: new Flex(
-          children,
-          direction: FlexDirection.vertical,
-          justifyContent: FlexJustifyContent.spaceAround
+    return new Theme(
+      data: new ThemeData.dark(
+        primary: colors.Teal,
+        accent: colors.Orange
+      ),
+      child: new Scaffold(
+        toolbar: new ToolBar(center: new Text('Sky Demos')),
+        body: new Material(
+          edge: MaterialEdge.canvas,
+          child: new DemoList()
         )
       )
     );
   }
 }
 
 void main() {
   runApp(new SkyHome());
 }