Creating spriteAsWidget helper

doc/examples/animation_widget/lib/main.dart

@@ -1,11 +1,17 @@
 import 'dart:async';
 
 import 'package:flame/animation.dart' as animation;
+import 'package:flame/sprite.dart';
 import 'package:flame/flame.dart';
 import 'package:flame/position.dart';
 import 'package:flutter/material.dart';
 
-void main() => runApp(MyApp());
+Sprite _sprite;
+
+void main() async {
+  _sprite = await Sprite.loadSprite('minotaur.png', width: 96, height: 96);
+  runApp(MyApp());
+}
 
 class MyApp extends StatelessWidget {
   @override
@@ -65,6 +71,9 @@ class _MyHomePageState extends State<MyHomePage> {
                 animation.Animation.sequenced('minotaur.png', 19,
                     textureWidth: 96.0)),
             const Text('Neat, hum?'),
+            const Text('By the way, you can also use static sprites as widgets:'),
+            Flame.util.spriteAsWidget(const Size(100, 100), _sprite),
+            const SizedBox(height: 40),
             const Text('Sprites from Elthen\'s amazing work on itch.io:'),
             const Text('https://elthen.itch.io/2d-pixel-art-minotaur-sprites'),
           ],

lib/util.dart

@@ -6,6 +6,7 @@ import 'package:flutter/services.dart';
 import 'package:flutter/widgets.dart' as widgets;
 
 import 'animation.dart';
+import 'sprite.dart';
 import 'components/animation_component.dart';
 import 'game.dart';
 import 'position.dart';
@@ -88,4 +89,26 @@ class Util {
         SimpleGame(AnimationComponent(size.x, size.y, animation)),
         size: size);
   }
+
+  /// Returns a regular Flutter widget represeting this sprite, rendered with the specified size.
+  ///
+  /// This will create a [CustomPaint] widget using a [CustomPainter] for rendering the [Sprite]
+  /// Be aware that the Sprite must have been loaded, otherwise it can't be rendered
+  widgets.CustomPaint spriteAsWidget(Size size, Sprite sprite) => widgets.CustomPaint(size: size, painter: _SpriteCustomPainter(sprite));
+}
+
+class _SpriteCustomPainter extends widgets.CustomPainter {
+  Sprite _sprite;
+
+  _SpriteCustomPainter(this._sprite);
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    if (_sprite.loaded()) {
+      _sprite.render(canvas, size.width, size.height);
+    }
+  }
+
+  @override
+  bool shouldRepaint(widgets.CustomPainter old) => false;
 }