// Copyright 2016 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 'package:flutter_test/flutter_test.dart'; import 'package:flutter/widgets.dart'; import 'package:flutter/rendering.dart'; Future<void> test(WidgetTester tester, double offset, { double anchor = 0.0 }) { return tester.pumpWidget( Directionality( textDirection: TextDirection.ltr, child: Viewport( anchor: anchor / 600.0, offset: ViewportOffset.fixed(offset), slivers: const <Widget>[ SliverToBoxAdapter(child: SizedBox(height: 400.0)), SliverToBoxAdapter(child: SizedBox(height: 400.0)), SliverToBoxAdapter(child: SizedBox(height: 400.0)), SliverToBoxAdapter(child: SizedBox(height: 400.0)), SliverToBoxAdapter(child: SizedBox(height: 400.0)), ], ), ), ); } void verify(WidgetTester tester, List<Offset> idealPositions, List<bool> idealVisibles) { final List<Offset> actualPositions = tester.renderObjectList<RenderBox>(find.byType(SizedBox, skipOffstage: false)).map<Offset>( (RenderBox target) => target.localToGlobal(const Offset(0.0, 0.0)) ).toList(); final List<bool> actualVisibles = tester.renderObjectList<RenderSliverToBoxAdapter>(find.byType(SliverToBoxAdapter, skipOffstage: false)).map<bool>( (RenderSliverToBoxAdapter target) => target.geometry.visible ).toList(); expect(actualPositions, equals(idealPositions)); expect(actualVisibles, equals(idealVisibles)); } void main() { testWidgets('Viewport basic test', (WidgetTester tester) async { await test(tester, 0.0); expect(tester.renderObject<RenderBox>(find.byType(Viewport)).size, equals(const Size(800.0, 600.0))); verify(tester, <Offset>[ const Offset(0.0, 0.0), const Offset(0.0, 400.0), const Offset(0.0, 800.0), const Offset(0.0, 1200.0), const Offset(0.0, 1600.0), ], <bool>[true, true, false, false, false]); await test(tester, 200.0); verify(tester, <Offset>[ const Offset(0.0, -200.0), const Offset(0.0, 200.0), const Offset(0.0, 600.0), const Offset(0.0, 1000.0), const Offset(0.0, 1400.0), ], <bool>[true, true, false, false, false]); await test(tester, 600.0); verify(tester, <Offset>[ const Offset(0.0, -600.0), const Offset(0.0, -200.0), const Offset(0.0, 200.0), const Offset(0.0, 600.0), const Offset(0.0, 1000.0), ], <bool>[false, true, true, false, false]); await test(tester, 900.0); verify(tester, <Offset>[ const Offset(0.0, -900.0), const Offset(0.0, -500.0), const Offset(0.0, -100.0), const Offset(0.0, 300.0), const Offset(0.0, 700.0), ], <bool>[false, false, true, true, false]); }); testWidgets('Viewport anchor test', (WidgetTester tester) async { await test(tester, 0.0, anchor: 100.0); expect(tester.renderObject<RenderBox>(find.byType(Viewport)).size, equals(const Size(800.0, 600.0))); verify(tester, <Offset>[ const Offset(0.0, 100.0), const Offset(0.0, 500.0), const Offset(0.0, 900.0), const Offset(0.0, 1300.0), const Offset(0.0, 1700.0), ], <bool>[true, true, false, false, false]); await test(tester, 200.0, anchor: 100.0); verify(tester, <Offset>[ const Offset(0.0, -100.0), const Offset(0.0, 300.0), const Offset(0.0, 700.0), const Offset(0.0, 1100.0), const Offset(0.0, 1500.0), ], <bool>[true, true, false, false, false]); await test(tester, 600.0, anchor: 100.0); verify(tester, <Offset>[ const Offset(0.0, -500.0), const Offset(0.0, -100.0), const Offset(0.0, 300.0), const Offset(0.0, 700.0), const Offset(0.0, 1100.0), ], <bool>[false, true, true, false, false]); await test(tester, 900.0, anchor: 100.0); verify(tester, <Offset>[ const Offset(0.0, -800.0), const Offset(0.0, -400.0), const Offset(0.0, 0.0), const Offset(0.0, 400.0), const Offset(0.0, 800.0), ], <bool>[false, false, true, true, false]); }); testWidgets('Multiple grids and lists', (WidgetTester tester) async { await tester.pumpWidget( Center( child: SizedBox( width: 44.4, height: 60.0, child: Directionality( textDirection: TextDirection.ltr, child: CustomScrollView( slivers: <Widget>[ SliverList( delegate: SliverChildListDelegate( <Widget>[ Container(height: 22.2, child: const Text('TOP')), Container(height: 22.2), Container(height: 22.2), ], ), ), SliverFixedExtentList( itemExtent: 22.2, delegate: SliverChildListDelegate( <Widget>[ Container(), Container(child: const Text('A')), Container(), ], ), ), SliverGrid( gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount( crossAxisCount: 2, ), delegate: SliverChildListDelegate( <Widget>[ Container(), Container(child: const Text('B')), Container(), ], ), ), SliverList( delegate: SliverChildListDelegate( <Widget>[ Container(height: 22.2), Container(height: 22.2), Container(height: 22.2, child: const Text('BOTTOM')), ], ), ), ], ), ), ), ), ); final TestGesture gesture = await tester.startGesture(const Offset(400.0, 300.0)); expect(find.text('TOP'), findsOneWidget); expect(find.text('A'), findsNothing); expect(find.text('B'), findsNothing); expect(find.text('BOTTOM'), findsNothing); await gesture.moveBy(const Offset(0.0, -70.0)); await tester.pump(); expect(find.text('TOP'), findsNothing); expect(find.text('A'), findsOneWidget); expect(find.text('B'), findsNothing); expect(find.text('BOTTOM'), findsNothing); await gesture.moveBy(const Offset(0.0, -70.0)); await tester.pump(); expect(find.text('TOP'), findsNothing); expect(find.text('A'), findsNothing); expect(find.text('B'), findsOneWidget); expect(find.text('BOTTOM'), findsNothing); await gesture.moveBy(const Offset(0.0, -70.0)); await tester.pump(); expect(find.text('TOP'), findsNothing); expect(find.text('A'), findsNothing); expect(find.text('B'), findsNothing); expect(find.text('BOTTOM'), findsOneWidget); }); }