75 lines
2.9 KiB
Dart
75 lines
2.9 KiB
Dart
import 'package:flutter_test/flutter_test.dart';
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import 'package:flutter/material.dart';
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import 'package:infinite_lazy_2d_grid/core/render.dart';
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import 'package:infinite_lazy_2d_grid/core/controller/controller.dart';
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import 'package:infinite_lazy_2d_grid/core/background.dart';
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class TestChild extends StatelessWidget {
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final int index;
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const TestChild({required this.index, super.key});
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@override
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Widget build(BuildContext context) {
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return GestureDetector(child: SizedBox(key: ValueKey('test_child_$index'), width: 50, height: 50));
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}
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}
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void main() {
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testWidgets('CanvasView renders only visible children and reduces count on zoom out', (WidgetTester tester) async {
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final controller = CanvasController(debug: true);
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for (int i = 0; i < 10000; i++) {
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controller.addChild(Offset((i % 80) * 100.0, (i ~/ 80) * 100.0), (_) => TestChild(index: i));
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}
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await tester.pumpWidget(
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MaterialApp(
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home: Scaffold(
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body: CanvasView(controller: controller, canvasBackground: SingleColorBackround(Colors.white)),
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),
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),
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);
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await tester.pumpAndSettle();
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final initialChildren = find.byType(TestChild);
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final initialCount = tester.widgetList(initialChildren).length;
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// should be less than 10000 children rendered (only those part of the visible viewport)
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expect(initialCount, lessThan(10000));
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expect(initialCount, greaterThan(0));
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controller.updateScalebyDelta(1); // 2x zoom in
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await tester.pumpAndSettle();
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// After zooming out, fewer children should be visible
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final afterZoomChildren = find.byType(TestChild);
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final afterZoomCount = tester.widgetList(afterZoomChildren).length;
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expect(afterZoomCount, lessThan(initialCount));
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expect(afterZoomCount, greaterThan(0));
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});
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testWidgets('CanvasView scales as expected', (WidgetTester tester) async {
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final controller = CanvasController(debug: true);
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controller.addChild(const Offset(0, 0), (_) => TestChild(index: 0));
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controller.addChild(const Offset(100, 100), (_) => TestChild(index: 1));
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await tester.pumpWidget(
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MaterialApp(
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home: Scaffold(
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body: CanvasView(controller: controller, canvasBackground: SingleColorBackround(Colors.white)),
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),
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),
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);
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await tester.pumpAndSettle();
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final context = tester.element(find.byType(CanvasView));
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// Initial size check
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final finder = find.byType(TestChild);
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expect(finder, findsNWidgets(2));
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// Simulate a scale update to 2x, keeping the top-left at (0,0)
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controller.onScaleStart(ScaleStartDetails(focalPoint: const Offset(0, 0)));
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controller.onScaleUpdate(ScaleUpdateDetails(focalPoint: const Offset(0, 0), scale: 2.0));
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await tester.pumpAndSettle();
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expect(controller.scale, 2.0);
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final ssPositions = controller.widgetsWithScreenPositions(context).map((e) => e.ssPosition).toList();
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expect(ssPositions, [Offset.zero, const Offset(200, 200)]);
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});
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}
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