Finishing fixing all examples

doc/examples/widgets/lib/main.dart

@@ -61,9 +61,9 @@ void main() async {
             ),
           ));
 
-  await Flame.images.load('buttons.png');
+  final buttonsImage = await Flame.images.load('buttons.png');
   final _buttons = SpriteSheet(
-    imageName: 'buttons.png',
+    image: buttonsImage,
     textureHeight: 20,
     textureWidth: 60,
     columns: 1,
@@ -100,7 +100,8 @@ void main() async {
     'Anchor.bottomCenter',
     'Anchor.bottomRight',
   ];
-  final shieldSprite = await Sprite.loadSprite('shield.png');
+  final shieldImage = await Flame.images.load('shield.png');
+  final shieldSprite = Sprite(shieldImage);
   dashbook.storiesOf('SpriteWidget').decorator(CenterDecorator()).add(
         'default',
         (ctx) => Container(
@@ -115,9 +116,9 @@ void main() async {
         ),
       );
 
-  await Flame.images.load('bomb_ptero.png');
+  final pteroImage = await Flame.images.load('bomb_ptero.png');
   final _animationSpriteSheet = SpriteSheet(
-    imageName: 'bomb_ptero.png',
+    image: pteroImage,
     textureHeight: 32,
     textureWidth: 48,
     columns: 4,

lib/main.dart

@@ -1,117 +0,0 @@
-import 'package:flutter/material.dart';
-
-void main() {
-  runApp(MyApp());
-}
-
-class MyApp extends StatelessWidget {
-  // This widget is the root of your application.
-  @override
-  Widget build(BuildContext context) {
-    return MaterialApp(
-      title: 'Flutter Demo',
-      theme: ThemeData(
-        // This is the theme of your application.
-        //
-        // Try running your application with "flutter run". You'll see the
-        // application has a blue toolbar. Then, without quitting the app, try
-        // changing the primarySwatch below to Colors.green and then invoke
-        // "hot reload" (press "r" in the console where you ran "flutter run",
-        // or simply save your changes to "hot reload" in a Flutter IDE).
-        // Notice that the counter didn't reset back to zero; the application
-        // is not restarted.
-        primarySwatch: Colors.blue,
-        // This makes the visual density adapt to the platform that you run
-        // the app on. For desktop platforms, the controls will be smaller and
-        // closer together (more dense) than on mobile platforms.
-        visualDensity: VisualDensity.adaptivePlatformDensity,
-      ),
-      home: MyHomePage(title: 'Flutter Demo Home Page'),
-    );
-  }
-}
-
-class MyHomePage extends StatefulWidget {
-  MyHomePage({Key key, this.title}) : super(key: key);
-
-  // This widget is the home page of your application. It is stateful, meaning
-  // that it has a State object (defined below) that contains fields that affect
-  // how it looks.
-
-  // This class is the configuration for the state. It holds the values (in this
-  // case the title) provided by the parent (in this case the App widget) and
-  // used by the build method of the State. Fields in a Widget subclass are
-  // always marked "final".
-
-  final String title;
-
-  @override
-  _MyHomePageState createState() => _MyHomePageState();
-}
-
-class _MyHomePageState extends State<MyHomePage> {
-  int _counter = 0;
-
-  void _incrementCounter() {
-    setState(() {
-      // This call to setState tells the Flutter framework that something has
-      // changed in this State, which causes it to rerun the build method below
-      // so that the display can reflect the updated values. If we changed
-      // _counter without calling setState(), then the build method would not be
-      // called again, and so nothing would appear to happen.
-      _counter++;
-    });
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    // This method is rerun every time setState is called, for instance as done
-    // by the _incrementCounter method above.
-    //
-    // The Flutter framework has been optimized to make rerunning build methods
-    // fast, so that you can just rebuild anything that needs updating rather
-    // than having to individually change instances of widgets.
-    return Scaffold(
-      appBar: AppBar(
-        // Here we take the value from the MyHomePage object that was created by
-        // the App.build method, and use it to set our appbar title.
-        title: Text(widget.title),
-      ),
-      body: Center(
-        // Center is a layout widget. It takes a single child and positions it
-        // in the middle of the parent.
-        child: Column(
-          // Column is also a layout widget. It takes a list of children and
-          // arranges them vertically. By default, it sizes itself to fit its
-          // children horizontally, and tries to be as tall as its parent.
-          //
-          // Invoke "debug painting" (press "p" in the console, choose the
-          // "Toggle Debug Paint" action from the Flutter Inspector in Android
-          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
-          // to see the wireframe for each widget.
-          //
-          // Column has various properties to control how it sizes itself and
-          // how it positions its children. Here we use mainAxisAlignment to
-          // center the children vertically; the main axis here is the vertical
-          // axis because Columns are vertical (the cross axis would be
-          // horizontal).
-          mainAxisAlignment: MainAxisAlignment.center,
-          children: <Widget>[
-            Text(
-              'You have pushed the button this many times:',
-            ),
-            Text(
-              '$_counter',
-              style: Theme.of(context).textTheme.headline4,
-            ),
-          ],
-        ),
-      ),
-      floatingActionButton: FloatingActionButton(
-        onPressed: _incrementCounter,
-        tooltip: 'Increment',
-        child: Icon(Icons.add),
-      ), // This trailing comma makes auto-formatting nicer for build methods.
-    );
-  }
-}

lib/nine_tile_box.dart

@@ -41,10 +41,6 @@ class NineTileBox {
 
   /// Renders this nine box as a rectangle of coordinates ([x], [y]) and size ([width], [height]).
   void draw(Canvas c, double x, double y, double width, double height) {
-    if (!sprite.loaded()) {
-      return;
-    }
-
     // corners
     _drawTile(c, _getDest(x, y), 0, 0);
     _drawTile(c, _getDest(x, y + height - destTileSize), 0, 2);

lib/widgets/animation_widget.dart

@@ -21,7 +21,7 @@ class SpriteAnimationWidget extends StatefulWidget {
     this.animation,
     this.playing = true,
     this.anchor = Anchor.topLeft,
-  }) : assert(animation.loaded(), 'Animation must be loaded');
+  });
 
   @override
   State createState() => _AnimationWidget();

lib/widgets/nine_tile_box.dart

@@ -16,7 +16,7 @@ class _Painter extends widgets.CustomPainter {
   });
 
   Sprite _getSpriteTile(double x, double y) =>
-      Sprite.fromImage(image, x: x, y: y, width: tileSize, height: tileSize);
+      Sprite(image, x: x, y: y, width: tileSize, height: tileSize);
 
   @override
   void paint(Canvas canvas, Size size) {

lib/widgets/sprite_widget.dart

@@ -19,7 +19,7 @@ class SpriteWidget extends StatelessWidget {
   SpriteWidget({
     @required this.sprite,
     this.anchor = Anchor.topLeft,
-  }) : assert(sprite.loaded(), 'Sprite must be loaded');
+  });
 
   @override
   Widget build(_) {