92 lines
2.9 KiB
Dart
92 lines
2.9 KiB
Dart
import 'package:flutter/material.dart';
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import 'package:infinite_lazy_grid/infinite_lazy_grid.dart';
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import 'widgets/build_counter_widget.dart';
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class CachingTestApp extends StatefulWidget {
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const CachingTestApp({super.key});
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@override
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State<CachingTestApp> createState() => _CachingTestAppState();
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}
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class _CachingTestAppState extends State<CachingTestApp> {
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final LazyCanvasController controller = LazyCanvasController(debug: false);
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@override
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void initState() {
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super.initState();
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// Add some test widgets
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for (int i = 0; i < 20; i++) {
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controller.addChild(
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Offset((i % 5) * 120.0, (i ~/ 5) * 120.0),
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BuildCounterWidget(
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key: ValueKey<int>(i), // since in the tree it will be just an array at the same height, a count change
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// along the egdes of screen build all so you need a key to identify individually
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color: Colors.primaries[i % Colors.primaries.length],
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label: 'Widget $i',
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),
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);
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}
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}
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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appBar: AppBar(
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title: const Text('Widget Caching Test'),
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actions: [
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IconButton(
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onPressed: () {
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// Force a rebuild by calling notifyListeners
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// In this new approach, Flutter handles the caching
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ScaffoldMessenger.of(context).showSnackBar(
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const SnackBar(
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content: Text('Flutter automatically handles widget caching - no manual invalidation needed!'),
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),
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);
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},
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icon: const Icon(Icons.refresh),
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tooltip: 'Flutter Auto-Caching Info',
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),
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],
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),
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body: Column(
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children: [
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Container(
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padding: const EdgeInsets.all(16),
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color: Colors.yellow[100],
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child: const Text(
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'Instructions:\n'
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'• Pan around the canvas - widgets should only build once initially\n'
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'• Watch the console for build messages\n'
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'• Use the refresh button to force rebuilds\n'
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'• Zoom in/out to see caching in action',
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style: TextStyle(fontSize: 12),
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),
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),
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Expanded(
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child: LazyCanvas(controller: controller, canvasBackground: const DotGridBackround()),
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),
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],
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),
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floatingActionButton: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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FloatingActionButton(
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heroTag: 'zoom_in',
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onPressed: () => controller.updateScalebyDelta(0.1),
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child: const Icon(Icons.zoom_in),
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),
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const SizedBox(height: 8),
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FloatingActionButton(
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heroTag: 'zoom_out',
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onPressed: () => controller.updateScalebyDelta(-0.1),
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child: const Icon(Icons.zoom_out),
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),
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],
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),
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);
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}
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}
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