| // Copyright 2014 The Flutter Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // This file is separate from viewport_caching_test.dart because we can't use |
| // both testWidgets and rendering_tester in the same file - testWidgets will |
| // initialize a binding, which rendering_tester will attempt to re-initialize |
| // (or vice versa). |
| |
| import 'dart:ui'; |
| |
| import 'package:flutter_test/flutter_test.dart'; |
| import 'package:flutter/foundation.dart'; |
| import 'package:flutter/rendering.dart'; |
| import 'package:flutter/widgets.dart'; |
| |
| void main() { |
| testWidgets('Viewport getOffsetToReveal - down', (WidgetTester tester) async { |
| List<Widget> children; |
| await tester.pumpWidget( |
| Directionality( |
| textDirection: TextDirection.ltr, |
| child: Center( |
| child: Container( |
| height: 200.0, |
| width: 300.0, |
| child: ListView( |
| controller: ScrollController(initialScrollOffset: 300.0), |
| children: children = List<Widget>.generate(20, (int i) { |
| return Container( |
| height: 100.0, |
| width: 300.0, |
| child: Text('Tile $i'), |
| ); |
| }), |
| ), |
| ), |
| ), |
| ), |
| ); |
| |
| final RenderAbstractViewport viewport = tester.allRenderObjects.whereType<RenderAbstractViewport>().first; |
| |
| final RenderObject target = tester.renderObject(find.byWidget(children[5], skipOffstage: false)); |
| RevealedOffset revealed = viewport.getOffsetToReveal(target, 0.0); |
| expect(revealed.offset, 500.0); |
| expect(revealed.rect, const Rect.fromLTWH(0.0, 0.0, 300.0, 100.0)); |
| |
| revealed = viewport.getOffsetToReveal(target, 1.0); |
| expect(revealed.offset, 400.0); |
| expect(revealed.rect, const Rect.fromLTWH(0.0, 100.0, 300.0, 100.0)); |
| |
| revealed = viewport.getOffsetToReveal(target, 0.0, rect: const Rect.fromLTWH(40.0, 40.0, 10.0, 10.0)); |
| expect(revealed.offset, 540.0); |
| expect(revealed.rect, const Rect.fromLTWH(40.0, 0.0, 10.0, 10.0)); |
| |
| revealed = viewport.getOffsetToReveal(target, 1.0, rect: const Rect.fromLTWH(40.0, 40.0, 10.0, 10.0)); |
| expect(revealed.offset, 350.0); |
| expect(revealed.rect, const Rect.fromLTWH(40.0, 190.0, 10.0, 10.0)); |
| }); |
| |
| testWidgets('Viewport getOffsetToReveal - right', (WidgetTester tester) async { |
| List<Widget> children; |
| |
| await tester.pumpWidget( |
| Directionality( |
| textDirection: TextDirection.ltr, |
| child: Center( |
| child: Container( |
| height: 300.0, |
| width: 200.0, |
| child: ListView( |
| scrollDirection: Axis.horizontal, |
| controller: ScrollController(initialScrollOffset: 300.0), |
| children: children = List<Widget>.generate(20, (int i) { |
| return Container( |
| height: 300.0, |
| width: 100.0, |
| child: Text('Tile $i'), |
| ); |
| }), |
| ), |
| ), |
| ), |
| ), |
| ); |
| |
| final RenderAbstractViewport viewport = tester.allRenderObjects.whereType<RenderAbstractViewport>().first; |
| |
| final RenderObject target = tester.renderObject(find.byWidget(children[5], skipOffstage: false)); |
| RevealedOffset revealed = viewport.getOffsetToReveal(target, 0.0); |
| expect(revealed.offset, 500.0); |
| expect(revealed.rect, const Rect.fromLTWH(0.0, 0.0, 100.0, 300.0)); |
| |
| revealed = viewport.getOffsetToReveal(target, 1.0); |
| expect(revealed.offset, 400.0); |
| expect(revealed.rect, const Rect.fromLTWH(100.0, 0.0, 100.0, 300.0)); |
| |
| revealed = viewport.getOffsetToReveal(target, 0.0, rect: const Rect.fromLTWH(40.0, 40.0, 10.0, 10.0)); |
| expect(revealed.offset, 540.0); |
| expect(revealed.rect, const Rect.fromLTWH(0.0, 40.0, 10.0, 10.0)); |
| |
| revealed = viewport.getOffsetToReveal(target, 1.0, rect: const Rect.fromLTWH(40.0, 40.0, 10.0, 10.0)); |
| expect(revealed.offset, 350.0); |
| expect(revealed.rect, const Rect.fromLTWH(190.0, 40.0, 10.0, 10.0)); |
| }); |
| |
| testWidgets('Viewport getOffsetToReveal - up', (WidgetTester tester) async { |
| List<Widget> children; |
| |
| await tester.pumpWidget( |
| Directionality( |
| textDirection: TextDirection.ltr, |
| child: Center( |
| child: Container( |
| height: 200.0, |
| width: 300.0, |
| child: ListView( |
| controller: ScrollController(initialScrollOffset: 300.0), |
| reverse: true, |
| children: children = List<Widget>.generate(20, (int i) { |
| return Container( |
| height: 100.0, |
| width: 300.0, |
| child: Text('Tile $i'), |
| ); |
| }), |
| ), |
| ), |
| ), |
| ), |
| ); |
| |
| final RenderAbstractViewport viewport = tester.allRenderObjects.whereType<RenderAbstractViewport>().first; |
| |
| final RenderObject target = tester.renderObject(find.byWidget(children[5], skipOffstage: false)); |
| RevealedOffset revealed = viewport.getOffsetToReveal(target, 0.0); |
| expect(revealed.offset, 500.0); |
| expect(revealed.rect, const Rect.fromLTWH(0.0, 100.0, 300.0, 100.0)); |
| |
| revealed = viewport.getOffsetToReveal(target, 1.0); |
| expect(revealed.offset, 400.0); |
| expect(revealed.rect, const Rect.fromLTWH(0.0, 0.0, 300.0, 100.0)); |
| |
| revealed = viewport.getOffsetToReveal(target, 0.0, rect: const Rect.fromLTWH(40.0, 40.0, 10.0, 10.0)); |
| expect(revealed.offset, 550.0); |
| expect(revealed.rect, const Rect.fromLTWH(40.0, 190.0, 10.0, 10.0)); |
| |
| revealed = viewport.getOffsetToReveal(target, 1.0, rect: const Rect.fromLTWH(40.0, 40.0, 10.0, 10.0)); |
| expect(revealed.offset, 360.0); |
| expect(revealed.rect, const Rect.fromLTWH(40.0, 0.0, 10.0, 10.0)); |
| }); |
| |
| testWidgets('Viewport getOffsetToReveal - left', (WidgetTester tester) async { |
| List<Widget> children; |
| |
| await tester.pumpWidget( |
| Directionality( |
| textDirection: TextDirection.ltr, |
| child: Center( |
| child: Container( |
| height: 300.0, |
| width: 200.0, |
| child: ListView( |
| scrollDirection: Axis.horizontal, |
| reverse: true, |
| controller: ScrollController(initialScrollOffset: 300.0), |
| children: children = List<Widget>.generate(20, (int i) { |
| return Container( |
| height: 300.0, |
| width: 100.0, |
| child: Text('Tile $i'), |
| ); |
| }), |
| ), |
| ), |
| ), |
| ), |
| ); |
| |
| final RenderAbstractViewport viewport = tester.allRenderObjects.whereType<RenderAbstractViewport>().first; |
| |
| final RenderObject target = tester.renderObject(find.byWidget(children[5], skipOffstage: false)); |
| RevealedOffset revealed = viewport.getOffsetToReveal(target, 0.0); |
| expect(revealed.offset, 500.0); |
| expect(revealed.rect, const Rect.fromLTWH(100.0, 0.0, 100.0, 300.0)); |
| |
| revealed = viewport.getOffsetToReveal(target, 1.0); |
| expect(revealed.offset, 400.0); |
| expect(revealed.rect, const Rect.fromLTWH(0.0, 0.0, 100.0, 300.0)); |
| |
| revealed = viewport.getOffsetToReveal(target, 0.0, rect: const Rect.fromLTWH(40.0, 40.0, 10.0, 10.0)); |
| expect(revealed.offset, 550.0); |
| expect(revealed.rect, const Rect.fromLTWH(190.0, 40.0, 10.0, 10.0)); |
| |
| revealed = viewport.getOffsetToReveal(target, 1.0, rect: const Rect.fromLTWH(40.0, 40.0, 10.0, 10.0)); |
| expect(revealed.offset, 360.0); |
| expect(revealed.rect, const Rect.fromLTWH(0.0, 40.0, 10.0, 10.0)); |
| }, skip: isBrowser); |
| |
| testWidgets('Viewport getOffsetToReveal Sliver - down', (WidgetTester tester) async { |
| final List<Widget> children = <Widget>[]; |
| await tester.pumpWidget( |
| Directionality( |
| textDirection: TextDirection.ltr, |
| child: Center( |
| child: Container( |
| height: 200.0, |
| width: 300.0, |
| child: CustomScrollView( |
| controller: ScrollController(initialScrollOffset: 300.0), |
| slivers: List<Widget>.generate(20, (int i) { |
| final Widget sliver = SliverToBoxAdapter( |
| child: Container( |
| height: 100.0, |
| child: Text('Tile $i'), |
| ), |
| ); |
| children.add(sliver); |
| return SliverPadding( |
| padding: const EdgeInsets.all(22.0), |
| sliver: sliver, |
| ); |
| }), |
| ), |
| ), |
| ), |
| ), |
| ); |
| |
| final RenderAbstractViewport viewport = tester.allRenderObjects.whereType<RenderAbstractViewport>().first; |
| |
| final RenderObject target = tester.renderObject(find.byWidget(children[5], skipOffstage: false)); |
| RevealedOffset revealed = viewport.getOffsetToReveal(target, 0.0); |
| expect(revealed.offset, 5 * (100 + 22 + 22) + 22); |
| |
| revealed = viewport.getOffsetToReveal(target, 1.0); |
| expect(revealed.offset, 5 * (100 + 22 + 22) + 22 - 100); |
| }); |
| |
| testWidgets('Viewport getOffsetToReveal Sliver - right', (WidgetTester tester) async { |
| final List<Widget> children = <Widget>[]; |
| await tester.pumpWidget( |
| Directionality( |
| textDirection: TextDirection.ltr, |
| child: Center( |
| child: Container( |
| height: 300.0, |
| width: 200.0, |
| child: CustomScrollView( |
| scrollDirection: Axis.horizontal, |
| controller: ScrollController(initialScrollOffset: 300.0), |
| slivers: List<Widget>.generate(20, (int i) { |
| final Widget sliver = SliverToBoxAdapter( |
| child: Container( |
| width: 100.0, |
| child: Text('Tile $i'), |
| ), |
| ); |
| children.add(sliver); |
| return SliverPadding( |
| padding: const EdgeInsets.all(22.0), |
| sliver: sliver, |
| ); |
| }), |
| ), |
| ), |
| ), |
| ), |
| ); |
| |
| final RenderAbstractViewport viewport = tester.allRenderObjects.whereType<RenderAbstractViewport>().first; |
| |
| final RenderObject target = tester.renderObject(find.byWidget(children[5], skipOffstage: false)); |
| RevealedOffset revealed = viewport.getOffsetToReveal(target, 0.0); |
| expect(revealed.offset, 5 * (100 + 22 + 22) + 22); |
| |
| revealed = viewport.getOffsetToReveal(target, 1.0); |
| expect(revealed.offset, 5 * (100 + 22 + 22) + 22 - 100); |
| }); |
| |
| testWidgets('Viewport getOffsetToReveal Sliver - up', (WidgetTester tester) async { |
| final List<Widget> children = <Widget>[]; |
| await tester.pumpWidget( |
| Directionality( |
| textDirection: TextDirection.ltr, |
| child: Center( |
| child: Container( |
| height: 200.0, |
| width: 300.0, |
| child: CustomScrollView( |
| controller: ScrollController(initialScrollOffset: 300.0), |
| reverse: true, |
| slivers: List<Widget>.generate(20, (int i) { |
| final Widget sliver = SliverToBoxAdapter( |
| child: Container( |
| height: 100.0, |
| child: Text('Tile $i'), |
| ), |
| ); |
| children.add(sliver); |
| return SliverPadding( |
| padding: const EdgeInsets.all(22.0), |
| sliver: sliver, |
| ); |
| }), |
| ), |
| ), |
| ), |
| ), |
| ); |
| |
| final RenderAbstractViewport viewport = tester.allRenderObjects.whereType<RenderAbstractViewport>().first; |
| |
| final RenderObject target = tester.renderObject(find.byWidget(children[5], skipOffstage: false)); |
| RevealedOffset revealed = viewport.getOffsetToReveal(target, 0.0); |
| expect(revealed.offset, 5 * (100 + 22 + 22) + 22); |
| |
| revealed = viewport.getOffsetToReveal(target, 1.0); |
| expect(revealed.offset, 5 * (100 + 22 + 22) + 22 - 100); |
| }); |
| |
| testWidgets('Viewport getOffsetToReveal Sliver - up - reverse growth', (WidgetTester tester) async { |
| const Key centerKey = ValueKey<String>('center'); |
| final Widget centerSliver = SliverPadding( |
| key: centerKey, |
| padding: const EdgeInsets.all(22.0), |
| sliver: SliverToBoxAdapter( |
| child: Container( |
| height: 100.0, |
| child: const Text('Tile center'), |
| ), |
| ), |
| ); |
| final Widget lowerItem = Container( |
| height: 100.0, |
| child: const Text('Tile lower'), |
| ); |
| final Widget lowerSliver = SliverPadding( |
| padding: const EdgeInsets.all(22.0), |
| sliver: SliverToBoxAdapter( |
| child: lowerItem, |
| ), |
| ); |
| |
| await tester.pumpWidget( |
| Directionality( |
| textDirection: TextDirection.ltr, |
| child: Center( |
| child: Container( |
| height: 200.0, |
| width: 300.0, |
| child: CustomScrollView( |
| center: centerKey, |
| reverse: true, |
| slivers: <Widget>[lowerSliver, centerSliver], |
| ), |
| ), |
| ), |
| ), |
| ); |
| |
| final RenderAbstractViewport viewport = tester.allRenderObjects.whereType<RenderAbstractViewport>().first; |
| |
| final RenderObject target = tester.renderObject(find.byWidget(lowerItem, skipOffstage: false)); |
| RevealedOffset revealed = viewport.getOffsetToReveal(target, 0.0); |
| expect(revealed.offset, - 100 - 22); |
| |
| revealed = viewport.getOffsetToReveal(target, 1.0); |
| expect(revealed.offset, - 100 - 22 - 100); |
| }); |
| |
| testWidgets('Viewport getOffsetToReveal Sliver - left - reverse growth', (WidgetTester tester) async { |
| const Key centerKey = ValueKey<String>('center'); |
| final Widget centerSliver = SliverPadding( |
| key: centerKey, |
| padding: const EdgeInsets.all(22.0), |
| sliver: SliverToBoxAdapter( |
| child: Container( |
| width: 100.0, |
| child: const Text('Tile center'), |
| ), |
| ), |
| ); |
| final Widget lowerItem = Container( |
| width: 100.0, |
| child: const Text('Tile lower'), |
| ); |
| final Widget lowerSliver = SliverPadding( |
| padding: const EdgeInsets.all(22.0), |
| sliver: SliverToBoxAdapter( |
| child: lowerItem, |
| ), |
| ); |
| |
| await tester.pumpWidget( |
| Directionality( |
| textDirection: TextDirection.ltr, |
| child: Center( |
| child: Container( |
| height: 200.0, |
| width: 300.0, |
| child: CustomScrollView( |
| scrollDirection: Axis.horizontal, |
| center: centerKey, |
| reverse: true, |
| slivers: <Widget>[lowerSliver, centerSliver], |
| ), |
| ), |
| ), |
| ), |
| ); |
| |
| final RenderAbstractViewport viewport = tester.allRenderObjects.whereType<RenderAbstractViewport>().first; |
| |
| final RenderObject target = tester.renderObject(find.byWidget(lowerItem, skipOffstage: false)); |
| RevealedOffset revealed = viewport.getOffsetToReveal(target, 0.0); |
| expect(revealed.offset, -100 - 22); |
| |
| revealed = viewport.getOffsetToReveal(target, 1.0); |
| expect(revealed.offset, - 100 - 22 - 200); |
| }); |
| |
| testWidgets('Viewport getOffsetToReveal Sliver - left', (WidgetTester tester) async { |
| final List<Widget> children = <Widget>[]; |
| await tester.pumpWidget( |
| Directionality( |
| textDirection: TextDirection.ltr, |
| child: Center( |
| child: Container( |
| height: 300.0, |
| width: 200.0, |
| child: CustomScrollView( |
| scrollDirection: Axis.horizontal, |
| reverse: true, |
| controller: ScrollController(initialScrollOffset: 300.0), |
| slivers: List<Widget>.generate(20, (int i) { |
| final Widget sliver = SliverToBoxAdapter( |
| child: Container( |
| width: 100.0, |
| child: Text('Tile $i'), |
| ), |
| ); |
| children.add(sliver); |
| return SliverPadding( |
| padding: const EdgeInsets.all(22.0), |
| sliver: sliver, |
| ); |
| }), |
| ), |
| ), |
| ), |
| ), |
| ); |
| |
| final RenderAbstractViewport viewport = tester.allRenderObjects.whereType<RenderAbstractViewport>().first; |
| |
| final RenderObject target = tester.renderObject(find.byWidget(children[5], skipOffstage: false)); |
| RevealedOffset revealed = viewport.getOffsetToReveal(target, 0.0); |
| expect(revealed.offset, 5 * (100 + 22 + 22) + 22); |
| |
| revealed = viewport.getOffsetToReveal(target, 1.0); |
| expect(revealed.offset, 5 * (100 + 22 + 22) + 22 - 100); |
| }); |
| |
| testWidgets('Nested Viewports showOnScreen', (WidgetTester tester) async { |
| final List<List<Widget>> children = List<List<Widget>>(10); |
| final List<ScrollController> controllersX = List<ScrollController>.generate(10, (int i) => ScrollController(initialScrollOffset: 400.0)); |
| final ScrollController controllerY = ScrollController(initialScrollOffset: 400.0); |
| |
| /// Builds a gird: |
| /// |
| /// <- x -> |
| /// 0 1 2 3 4 5 6 7 8 9 |
| /// 0 c c c c c c c c c c |
| /// 1 c c c c c c c c c c |
| /// 2 c c c c c c c c c c |
| /// 3 c c c c c c c c c c y |
| /// 4 c c c c v v c c c c |
| /// 5 c c c c v v c c c c |
| /// 6 c c c c c c c c c c |
| /// 7 c c c c c c c c c c |
| /// 8 c c c c c c c c c c |
| /// 9 c c c c c c c c c c |
| /// |
| /// Each c is a 100x100 container, v are containers visible in initial |
| /// viewport. |
| |
| await tester.pumpWidget( |
| Directionality( |
| textDirection: TextDirection.ltr, |
| child: Center( |
| child: Container( |
| height: 200.0, |
| width: 200.0, |
| child: ListView( |
| controller: controllerY, |
| children: List<Widget>.generate(10, (int y) { |
| return Container( |
| height: 100.0, |
| child: ListView( |
| scrollDirection: Axis.horizontal, |
| controller: controllersX[y], |
| children: children[y] = List<Widget>.generate(10, (int x) { |
| return Container( |
| height: 100.0, |
| width: 100.0, |
| child: Text('$x,$y'), |
| ); |
| }), |
| ), |
| ); |
| }), |
| ), |
| ), |
| ), |
| ), |
| ); |
| |
| // Already in viewport |
| tester.renderObject(find.byWidget(children[4][4], skipOffstage: false)).showOnScreen(); |
| await tester.pumpAndSettle(); |
| expect(controllersX[4].offset, 400.0); |
| expect(controllerY.offset, 400.0); |
| |
| controllersX[4].jumpTo(400.0); |
| controllerY.jumpTo(400.0); |
| await tester.pumpAndSettle(); |
| |
| // Above viewport |
| tester.renderObject(find.byWidget(children[3][4], skipOffstage: false)).showOnScreen(); |
| await tester.pumpAndSettle(); |
| expect(controllersX[3].offset, 400.0); |
| expect(controllerY.offset, 300.0); |
| |
| controllersX[3].jumpTo(400.0); |
| controllerY.jumpTo(400.0); |
| await tester.pumpAndSettle(); |
| |
| // Below viewport |
| tester.renderObject(find.byWidget(children[6][4], skipOffstage: false)).showOnScreen(); |
| await tester.pumpAndSettle(); |
| expect(controllersX[6].offset, 400.0); |
| expect(controllerY.offset, 500.0); |
| |
| controllersX[6].jumpTo(400.0); |
| controllerY.jumpTo(400.0); |
| await tester.pumpAndSettle(); |
| |
| // Left of viewport |
| tester.renderObject(find.byWidget(children[4][3], skipOffstage: false)).showOnScreen(); |
| await tester.pumpAndSettle(); |
| expect(controllersX[4].offset, 300.0); |
| expect(controllerY.offset, 400.0); |
| |
| controllersX[4].jumpTo(400.0); |
| controllerY.jumpTo(400.0); |
| await tester.pumpAndSettle(); |
| |
| // Right of viewport |
| tester.renderObject(find.byWidget(children[4][6], skipOffstage: false)).showOnScreen(); |
| await tester.pumpAndSettle(); |
| expect(controllersX[4].offset, 500.0); |
| expect(controllerY.offset, 400.0); |
| |
| controllersX[4].jumpTo(400.0); |
| controllerY.jumpTo(400.0); |
| await tester.pumpAndSettle(); |
| |
| // Above and left of viewport |
| tester.renderObject(find.byWidget(children[3][3], skipOffstage: false)).showOnScreen(); |
| await tester.pumpAndSettle(); |
| expect(controllersX[3].offset, 300.0); |
| expect(controllerY.offset, 300.0); |
| |
| controllersX[3].jumpTo(400.0); |
| controllerY.jumpTo(400.0); |
| await tester.pumpAndSettle(); |
| |
| // Below and left of viewport |
| tester.renderObject(find.byWidget(children[6][3], skipOffstage: false)).showOnScreen(); |
| await tester.pumpAndSettle(); |
| expect(controllersX[6].offset, 300.0); |
| expect(controllerY.offset, 500.0); |
| |
| controllersX[6].jumpTo(400.0); |
| controllerY.jumpTo(400.0); |
| await tester.pumpAndSettle(); |
| |
| // Above and right of viewport |
| tester.renderObject(find.byWidget(children[3][6], skipOffstage: false)).showOnScreen(); |
| await tester.pumpAndSettle(); |
| expect(controllersX[3].offset, 500.0); |
| expect(controllerY.offset, 300.0); |
| |
| controllersX[3].jumpTo(400.0); |
| controllerY.jumpTo(400.0); |
| await tester.pumpAndSettle(); |
| |
| // Below and right of viewport |
| tester.renderObject(find.byWidget(children[6][6], skipOffstage: false)).showOnScreen(); |
| await tester.pumpAndSettle(); |
| expect(controllersX[6].offset, 500.0); |
| expect(controllerY.offset, 500.0); |
| |
| controllersX[6].jumpTo(400.0); |
| controllerY.jumpTo(400.0); |
| await tester.pumpAndSettle(); |
| |
| // Below and right of viewport with animations |
| tester.renderObject(find.byWidget(children[6][6], skipOffstage: false)).showOnScreen(duration: const Duration(seconds: 2)); |
| await tester.pump(); |
| await tester.pump(const Duration(seconds: 1)); |
| expect(tester.hasRunningAnimations, isTrue); |
| expect(controllersX[6].offset, greaterThan(400.0)); |
| expect(controllersX[6].offset, lessThan(500.0)); |
| expect(controllerY.offset, greaterThan(400.0)); |
| expect(controllerY.offset, lessThan(500.0)); |
| await tester.pumpAndSettle(); |
| expect(controllersX[6].offset, 500.0); |
| expect(controllerY.offset, 500.0); |
| }); |
| |
| group('Nested viewports (same orientation) showOnScreen', () { |
| List<Widget> children; |
| |
| Future<void> buildNestedScroller({ WidgetTester tester, ScrollController inner, ScrollController outer }) { |
| return tester.pumpWidget( |
| Directionality( |
| textDirection: TextDirection.ltr, |
| child: Center( |
| child: Container( |
| height: 200.0, |
| width: 300.0, |
| child: ListView( |
| controller: outer, |
| children: <Widget>[ |
| Container( |
| height: 200.0, |
| ), |
| Container( |
| height: 200.0, |
| width: 300.0, |
| child: ListView( |
| controller: inner, |
| children: children = List<Widget>.generate(10, (int i) { |
| return Container( |
| height: 100.0, |
| width: 300.0, |
| child: Text('$i'), |
| ); |
| }), |
| ), |
| ), |
| Container( |
| height: 200.0, |
| ), |
| ], |
| ), |
| ), |
| ), |
| ), |
| ); |
| } |
| |
| testWidgets('Reverse List showOnScreen', (WidgetTester tester) async { |
| const double screenHeight = 400.0; |
| const double screenWidth = 400.0; |
| const double itemHeight = screenHeight / 10.0; |
| const ValueKey<String> centerKey = ValueKey<String>('center'); |
| |
| tester.binding.window.devicePixelRatioTestValue = 1.0; |
| tester.binding.window.physicalSizeTestValue = const Size(screenWidth, screenHeight); |
| |
| await tester.pumpWidget(Directionality( |
| textDirection: TextDirection.ltr, |
| child: CustomScrollView( |
| center: centerKey, |
| reverse: true, |
| slivers: <Widget>[ |
| SliverList( |
| delegate: SliverChildListDelegate( |
| List<Widget>.generate( |
| 10, |
| (int index) => SizedBox( |
| height: itemHeight, |
| child: Text('Item ${-index - 1}'), |
| ), |
| ), |
| ), |
| ), |
| SliverList( |
| key: centerKey, |
| delegate: SliverChildListDelegate( |
| List<Widget>.generate( |
| 1, |
| (int index) => const SizedBox( |
| height: itemHeight, |
| child: Text('Item 0'), |
| ), |
| ), |
| ), |
| ), |
| SliverList( |
| delegate: SliverChildListDelegate( |
| List<Widget>.generate( |
| 10, |
| (int index) => SizedBox( |
| height: itemHeight, |
| child: Text('Item ${index + 1}'), |
| ), |
| ), |
| ), |
| ), |
| ], |
| ), |
| ), |
| ); |
| |
| expect(find.text('Item -1'), findsNothing); |
| |
| final RenderBox itemNeg1 = |
| tester.renderObject(find.text('Item -1', skipOffstage: false)); |
| |
| itemNeg1.showOnScreen(duration: const Duration(seconds: 1)); |
| await tester.pumpAndSettle(); |
| |
| expect(find.text('Item -1'), findsOneWidget); |
| }); |
| |
| testWidgets('in view in inner, but not in outer', (WidgetTester tester) async { |
| final ScrollController inner = ScrollController(); |
| final ScrollController outer = ScrollController(); |
| await buildNestedScroller( |
| tester: tester, |
| inner: inner, |
| outer: outer, |
| ); |
| expect(outer.offset, 0.0); |
| expect(inner.offset, 0.0); |
| |
| tester.renderObject(find.byWidget(children[0], skipOffstage: false)).showOnScreen(); |
| await tester.pumpAndSettle(); |
| expect(inner.offset, 0.0); |
| expect(outer.offset, 100.0); |
| }); |
| |
| testWidgets('not in view of neither inner nor outer', (WidgetTester tester) async { |
| final ScrollController inner = ScrollController(); |
| final ScrollController outer = ScrollController(); |
| await buildNestedScroller( |
| tester: tester, |
| inner: inner, |
| outer: outer, |
| ); |
| expect(outer.offset, 0.0); |
| expect(inner.offset, 0.0); |
| |
| tester.renderObject(find.byWidget(children[4], skipOffstage: false)).showOnScreen(); |
| await tester.pumpAndSettle(); |
| expect(inner.offset, 300.0); |
| expect(outer.offset, 200.0); |
| }); |
| |
| testWidgets('in view in inner and outer', (WidgetTester tester) async { |
| final ScrollController inner = ScrollController(initialScrollOffset: 200.0); |
| final ScrollController outer = ScrollController(initialScrollOffset: 200.0); |
| await buildNestedScroller( |
| tester: tester, |
| inner: inner, |
| outer: outer, |
| ); |
| expect(outer.offset, 200.0); |
| expect(inner.offset, 200.0); |
| |
| tester.renderObject(find.byWidget(children[2])).showOnScreen(); |
| await tester.pumpAndSettle(); |
| expect(outer.offset, 200.0); |
| expect(inner.offset, 200.0); |
| }); |
| |
| testWidgets('inner shown in outer, but item not visible', (WidgetTester tester) async { |
| final ScrollController inner = ScrollController(initialScrollOffset: 200.0); |
| final ScrollController outer = ScrollController(initialScrollOffset: 200.0); |
| await buildNestedScroller( |
| tester: tester, |
| inner: inner, |
| outer: outer, |
| ); |
| expect(outer.offset, 200.0); |
| expect(inner.offset, 200.0); |
| |
| tester.renderObject(find.byWidget(children[5], skipOffstage: false)).showOnScreen(); |
| await tester.pumpAndSettle(); |
| expect(outer.offset, 200.0); |
| expect(inner.offset, 400.0); |
| }); |
| |
| testWidgets('inner half shown in outer, item only visible in inner', (WidgetTester tester) async { |
| final ScrollController inner = ScrollController(); |
| final ScrollController outer = ScrollController(initialScrollOffset: 100.0); |
| await buildNestedScroller( |
| tester: tester, |
| inner: inner, |
| outer: outer, |
| ); |
| expect(outer.offset, 100.0); |
| expect(inner.offset, 0.0); |
| |
| tester.renderObject(find.byWidget(children[1])).showOnScreen(); |
| await tester.pumpAndSettle(); |
| expect(outer.offset, 200.0); |
| expect(inner.offset, 0.0); |
| }); |
| }); |
| |
| testWidgets('Nested Viewports showOnScreen with allowImplicitScrolling=false for inner viewport', (WidgetTester tester) async { |
| // Regression test for https://github.com/flutter/flutter/issues/20893. |
| |
| List<Widget> slivers; |
| final ScrollController controllerX = ScrollController(initialScrollOffset: 0.0); |
| final ScrollController controllerY = ScrollController(initialScrollOffset: 0.0); |
| |
| await tester.pumpWidget( |
| Directionality( |
| textDirection: TextDirection.ltr, |
| child: Center( |
| child: Container( |
| height: 200.0, |
| width: 200.0, |
| child: ListView( |
| controller: controllerY, |
| children: <Widget>[ |
| Container( |
| height: 150.0, |
| ), |
| Container( |
| height: 100.0, |
| child: ListView( |
| physics: const PageScrollPhysics(), // Turns off `allowImplicitScrolling` |
| scrollDirection: Axis.horizontal, |
| controller: controllerX, |
| children: slivers = <Widget>[ |
| Container( |
| width: 150.0, |
| ), |
| Container( |
| width: 150.0, |
| ), |
| ], |
| ), |
| ), |
| Container( |
| height: 150.0, |
| ), |
| ], |
| ), |
| ), |
| ), |
| ), |
| ); |
| |
| tester.renderObject(find.byWidget(slivers[1])).showOnScreen(); |
| await tester.pumpAndSettle(); |
| expect(controllerX.offset, 0.0); |
| expect(controllerY.offset, 50.0); |
| }); |
| |
| testWidgets('Nested Viewports showOnScreen on Sliver with allowImplicitScrolling=false for inner viewport', (WidgetTester tester) async { |
| Widget sliver; |
| final ScrollController controllerX = ScrollController(initialScrollOffset: 0.0); |
| final ScrollController controllerY = ScrollController(initialScrollOffset: 0.0); |
| |
| await tester.pumpWidget( |
| Directionality( |
| textDirection: TextDirection.ltr, |
| child: Center( |
| child: Container( |
| height: 200.0, |
| width: 200.0, |
| child: ListView( |
| controller: controllerY, |
| children: <Widget>[ |
| Container( |
| height: 150.0, |
| ), |
| Container( |
| height: 100.0, |
| child: CustomScrollView( |
| physics: const PageScrollPhysics(), // Turns off `allowImplicitScrolling` |
| scrollDirection: Axis.horizontal, |
| controller: controllerX, |
| slivers: <Widget>[ |
| SliverPadding( |
| padding: const EdgeInsets.all(25.0), |
| sliver: SliverToBoxAdapter( |
| child: Container( |
| width: 100.0, |
| ), |
| ), |
| ), |
| SliverPadding( |
| padding: const EdgeInsets.all(25.0), |
| sliver: sliver = SliverToBoxAdapter( |
| child: Container( |
| width: 100.0, |
| ), |
| ), |
| ), |
| ], |
| ), |
| ), |
| Container( |
| height: 150.0, |
| ), |
| ], |
| ), |
| ), |
| ), |
| ), |
| ); |
| |
| tester.renderObject(find.byWidget(sliver)).showOnScreen(); |
| await tester.pumpAndSettle(); |
| expect(controllerX.offset, 0.0); |
| expect(controllerY.offset, 25.0); |
| }); |
| |
| testWidgets('Viewport showOnScreen with objects larger than viewport', (WidgetTester tester) async { |
| List<Widget> children; |
| ScrollController controller; |
| |
| await tester.pumpWidget( |
| Directionality( |
| textDirection: TextDirection.ltr, |
| child: Center( |
| child: Container( |
| height: 200.0, |
| child: ListView( |
| controller: controller = ScrollController(initialScrollOffset: 300.0), |
| children: children = List<Widget>.generate(20, (int i) { |
| return Container( |
| height: 300.0, |
| child: Text('Tile $i'), |
| ); |
| }), |
| ), |
| ), |
| ), |
| ), |
| ); |
| |
| expect(controller.offset, 300.0); |
| |
| // Already aligned with leading edge, nothing happens. |
| tester.renderObject(find.byWidget(children[1], skipOffstage: false)).showOnScreen(); |
| await tester.pumpAndSettle(); |
| expect(controller.offset, 300.0); |
| |
| // Above leading edge aligns trailing edges |
| tester.renderObject(find.byWidget(children[0], skipOffstage: false)).showOnScreen(); |
| await tester.pumpAndSettle(); |
| expect(controller.offset, 100.0); |
| |
| // Below trailing edge aligns leading edges |
| tester.renderObject(find.byWidget(children[1], skipOffstage: false)).showOnScreen(); |
| await tester.pumpAndSettle(); |
| expect(controller.offset, 300.0); |
| |
| controller.jumpTo(250.0); |
| await tester.pumpAndSettle(); |
| expect(controller.offset, 250.0); |
| |
| // Partly visible across leading edge aligns trailing edges |
| tester.renderObject(find.byWidget(children[0], skipOffstage: false)).showOnScreen(); |
| await tester.pumpAndSettle(); |
| expect(controller.offset, 100.0); |
| |
| controller.jumpTo(150.0); |
| await tester.pumpAndSettle(); |
| expect(controller.offset, 150.0); |
| |
| // Partly visible across trailing edge aligns leading edges |
| tester.renderObject(find.byWidget(children[1], skipOffstage: false)).showOnScreen(); |
| await tester.pumpAndSettle(); |
| expect(controller.offset, 300.0); |
| }); |
| |
| group('unbounded constraints control test', () { |
| Widget buildNestedWidget([Axis a1 = Axis.vertical, Axis a2 = Axis.horizontal]) { |
| return Directionality( |
| textDirection: TextDirection.ltr, |
| child: Center( |
| child: Container( |
| child: ListView( |
| scrollDirection: a1, |
| children: List<Widget>.generate(10, (int y) { |
| return Container( |
| child: ListView( |
| scrollDirection: a2, |
| ), |
| ); |
| }), |
| ), |
| ), |
| ), |
| ); |
| } |
| |
| Future<void> expectFlutterError({ |
| Widget widget, |
| WidgetTester tester, |
| String message, |
| }) async { |
| final List<FlutterErrorDetails> errors = <FlutterErrorDetails>[]; |
| final FlutterExceptionHandler oldHandler = FlutterError.onError; |
| FlutterError.onError = (FlutterErrorDetails error) => errors.add(error); |
| try { |
| await tester.pumpWidget(widget); |
| } finally { |
| FlutterError.onError = oldHandler; |
| } |
| expect(errors, isNotEmpty); |
| expect(errors.first.exception, isFlutterError); |
| expect(errors.first.exception.toStringDeep(), message); |
| } |
| |
| testWidgets('Horizontal viewport was given unbounded height', (WidgetTester tester) async { |
| await expectFlutterError( |
| widget: buildNestedWidget(), |
| tester: tester, |
| message: |
| 'FlutterError\n' |
| ' Horizontal viewport was given unbounded height.\n' |
| ' Viewports expand in the cross axis to fill their container and\n' |
| ' constrain their children to match their extent in the cross axis.\n' |
| ' In this case, a horizontal viewport was given an unlimited amount\n' |
| ' of vertical space in which to expand.\n', |
| ); |
| }); |
| |
| testWidgets('Horizontal viewport was given unbounded width', (WidgetTester tester) async { |
| await expectFlutterError( |
| widget: buildNestedWidget(Axis.horizontal, Axis.horizontal), |
| tester: tester, |
| message: |
| 'FlutterError\n' |
| ' Horizontal viewport was given unbounded width.\n' |
| ' Viewports expand in the scrolling direction to fill their\n' |
| ' container. In this case, a horizontal viewport was given an\n' |
| ' unlimited amount of horizontal space in which to expand. This\n' |
| ' situation typically happens when a scrollable widget is nested\n' |
| ' inside another scrollable widget.\n' |
| ' If this widget is always nested in a scrollable widget there is\n' |
| ' no need to use a viewport because there will always be enough\n' |
| ' horizontal space for the children. In this case, consider using a\n' |
| ' Row instead. Otherwise, consider using the "shrinkWrap" property\n' |
| ' (or a ShrinkWrappingViewport) to size the width of the viewport\n' |
| ' to the sum of the widths of its children.\n' |
| ); |
| }); |
| |
| testWidgets('Vertical viewport was given unbounded width', (WidgetTester tester) async { |
| await expectFlutterError( |
| widget: buildNestedWidget(Axis.horizontal, Axis.vertical), |
| tester: tester, |
| message: |
| 'FlutterError\n' |
| ' Vertical viewport was given unbounded width.\n' |
| ' Viewports expand in the cross axis to fill their container and\n' |
| ' constrain their children to match their extent in the cross axis.\n' |
| ' In this case, a vertical viewport was given an unlimited amount\n' |
| ' of horizontal space in which to expand.\n' |
| ); |
| }); |
| |
| testWidgets('Vertical viewport was given unbounded height', (WidgetTester tester) async { |
| await expectFlutterError( |
| widget: buildNestedWidget(Axis.vertical, Axis.vertical), |
| tester: tester, |
| message: |
| 'FlutterError\n' |
| ' Vertical viewport was given unbounded height.\n' |
| ' Viewports expand in the scrolling direction to fill their\n' |
| ' container. In this case, a vertical viewport was given an\n' |
| ' unlimited amount of vertical space in which to expand. This\n' |
| ' situation typically happens when a scrollable widget is nested\n' |
| ' inside another scrollable widget.\n' |
| ' If this widget is always nested in a scrollable widget there is\n' |
| ' no need to use a viewport because there will always be enough\n' |
| ' vertical space for the children. In this case, consider using a\n' |
| ' Column instead. Otherwise, consider using the "shrinkWrap"\n' |
| ' property (or a ShrinkWrappingViewport) to size the height of the\n' |
| ' viewport to the sum of the heights of its children.\n' |
| ); |
| }); |
| }); |
| |
| test('Viewport debugThrowIfNotCheckingIntrinsics() control test', () { |
| final RenderViewport renderViewport = RenderViewport( |
| crossAxisDirection: AxisDirection.right, offset: ViewportOffset.zero() |
| ); |
| FlutterError error; |
| try { |
| renderViewport.computeMinIntrinsicHeight(0); |
| } on FlutterError catch (e) { |
| error = e; |
| } |
| expect(error, isNotNull); |
| expect( |
| error.toStringDeep(), |
| 'FlutterError\n' |
| ' RenderViewport does not support returning intrinsic dimensions.\n' |
| ' Calculating the intrinsic dimensions would require instantiating\n' |
| ' every child of the viewport, which defeats the point of viewports\n' |
| ' being lazy.\n' |
| ' If you are merely trying to shrink-wrap the viewport in the main\n' |
| ' axis direction, consider a RenderShrinkWrappingViewport render\n' |
| ' object (ShrinkWrappingViewport widget), which achieves that\n' |
| ' effect without implementing the intrinsic dimension API.\n', |
| ); |
| |
| final RenderShrinkWrappingViewport renderShrinkWrappingViewport = RenderShrinkWrappingViewport( |
| crossAxisDirection: AxisDirection.right, offset: ViewportOffset.zero() |
| ); |
| error = null; |
| try { |
| renderShrinkWrappingViewport.computeMinIntrinsicHeight(0); |
| } on FlutterError catch (e) { |
| error = e; |
| } |
| expect(error, isNotNull); |
| expect( |
| error.toStringDeep(), |
| 'FlutterError\n' |
| ' RenderShrinkWrappingViewport does not support returning intrinsic\n' |
| ' dimensions.\n' |
| ' Calculating the intrinsic dimensions would require instantiating\n' |
| ' every child of the viewport, which defeats the point of viewports\n' |
| ' being lazy.\n' |
| ' If you are merely trying to shrink-wrap the viewport in the main\n' |
| ' axis direction, you should be able to achieve that effect by just\n' |
| ' giving the viewport loose constraints, without needing to measure\n' |
| ' its intrinsic dimensions.\n', |
| ); |
| }); |
| |
| testWidgets('Handles infinite constraints when TargetPlatform is iOS or macOS', (WidgetTester tester) async { |
| // regression test for https://github.com/flutter/flutter/issues/45866 |
| await tester.pumpWidget( |
| Directionality( |
| textDirection: TextDirection.ltr, |
| child: Column( |
| crossAxisAlignment: CrossAxisAlignment.start, |
| mainAxisAlignment: MainAxisAlignment.center, |
| children: <Widget>[ |
| GridView( |
| shrinkWrap: true, |
| gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount( |
| crossAxisCount: 3, |
| childAspectRatio: 3, |
| mainAxisSpacing: 3, |
| crossAxisSpacing: 3), |
| children: const <Widget>[ |
| Text('a'), |
| Text('b'), |
| Text('c'), |
| ], |
| ), |
| ], |
| ), |
| ), |
| ); |
| |
| expect(find.text('b'), findsOneWidget); |
| await tester.drag(find.text('b'), const Offset(0, 200)); |
| await tester.pumpAndSettle(); |
| }, variant: const TargetPlatformVariant(<TargetPlatform>{ TargetPlatform.iOS, TargetPlatform.macOS })); |
| } |
