// 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/rendering.dart'; import 'package:flutter/widgets.dart'; void verifyPaintPosition(GlobalKey key, Offset ideal, bool visible) { final RenderSliver target = key.currentContext.findRenderObject(); expect(target.parent, isInstanceOf<RenderViewport>()); final SliverPhysicalParentData parentData = target.parentData; final Offset actual = parentData.paintOffset; expect(actual, ideal); final SliverGeometry geometry = target.geometry; expect(geometry.visible, visible); } void verifyActualBoxPosition(WidgetTester tester, Finder finder, int index, Rect ideal) { final RenderBox box = tester.renderObjectList<RenderBox>(finder).elementAt(index); final Rect rect = Rect.fromPoints(box.localToGlobal(Offset.zero), box.localToGlobal(box.size.bottomRight(Offset.zero))); expect(rect, equals(ideal)); } void main() { testWidgets('Sliver appbars - floating - scroll offset doesn\'t change', (WidgetTester tester) async { const double bigHeight = 1000.0; await tester.pumpWidget( Directionality( textDirection: TextDirection.ltr, child: CustomScrollView( slivers: <Widget>[ const BigSliver(height: bigHeight), SliverPersistentHeader(delegate: TestDelegate(), floating: true), const BigSliver(height: bigHeight), ], ), ), ); final ScrollPosition position = tester.state<ScrollableState>(find.byType(Scrollable)).position; final double max = bigHeight * 2.0 + TestDelegate().maxExtent - 600.0; // 600 is the height of the test viewport assert(max < 10000.0); expect(max, 1600.0); expect(position.pixels, 0.0); expect(position.minScrollExtent, 0.0); expect(position.maxScrollExtent, max); position.animateTo(10000.0, curve: Curves.linear, duration: const Duration(minutes: 1)); await tester.pumpAndSettle(const Duration(milliseconds: 50)); expect(position.pixels, max); expect(position.minScrollExtent, 0.0); expect(position.maxScrollExtent, max); }); testWidgets('Sliver appbars - floating - normal behavior works', (WidgetTester tester) async { final TestDelegate delegate = TestDelegate(); const double bigHeight = 1000.0; GlobalKey key1, key2, key3; await tester.pumpWidget( Directionality( textDirection: TextDirection.ltr, child: CustomScrollView( slivers: <Widget>[ BigSliver(key: key1 = GlobalKey(), height: bigHeight), SliverPersistentHeader(key: key2 = GlobalKey(), delegate: delegate, floating: true), BigSliver(key: key3 = GlobalKey(), height: bigHeight), ], ), ), ); final ScrollPosition position = tester.state<ScrollableState>(find.byType(Scrollable)).position; verifyPaintPosition(key1, const Offset(0.0, 0.0), true); verifyPaintPosition(key2, const Offset(0.0, 1000.0), false); verifyPaintPosition(key3, const Offset(0.0, 1200.0), false); position.animateTo(bigHeight - 600.0 + delegate.maxExtent, curve: Curves.linear, duration: const Duration(minutes: 1)); await tester.pumpAndSettle(const Duration(milliseconds: 1000)); verifyPaintPosition(key1, const Offset(0.0, 0.0), true); verifyPaintPosition(key2, Offset(0.0, 600.0 - delegate.maxExtent), true); verifyActualBoxPosition(tester, find.byType(Container), 0, Rect.fromLTWH(0.0, 600.0 - delegate.maxExtent, 800.0, delegate.maxExtent)); verifyPaintPosition(key3, const Offset(0.0, 600.0), false); assert(delegate.maxExtent * 2.0 < 600.0); // make sure this fits on the test screen... position.animateTo(bigHeight - 600.0 + delegate.maxExtent * 2.0, curve: Curves.linear, duration: const Duration(minutes: 1)); await tester.pumpAndSettle(const Duration(milliseconds: 1000)); verifyPaintPosition(key1, const Offset(0.0, 0.0), true); verifyPaintPosition(key2, Offset(0.0, 600.0 - delegate.maxExtent * 2.0), true); verifyActualBoxPosition(tester, find.byType(Container), 0, Rect.fromLTWH(0.0, 600.0 - delegate.maxExtent * 2.0, 800.0, delegate.maxExtent)); verifyPaintPosition(key3, Offset(0.0, 600.0 - delegate.maxExtent), true); position.animateTo(bigHeight, curve: Curves.linear, duration: const Duration(minutes: 1)); await tester.pumpAndSettle(const Duration(milliseconds: 1000)); verifyPaintPosition(key1, const Offset(0.0, 0.0), false); verifyPaintPosition(key2, const Offset(0.0, 0.0), true); verifyActualBoxPosition(tester, find.byType(Container), 0, Rect.fromLTWH(0.0, 0.0, 800.0, delegate.maxExtent)); verifyPaintPosition(key3, Offset(0.0, delegate.maxExtent), true); position.animateTo(bigHeight + delegate.maxExtent * 0.1, curve: Curves.linear, duration: const Duration(minutes: 1)); await tester.pumpAndSettle(const Duration(milliseconds: 1000)); verifyPaintPosition(key1, const Offset(0.0, 0.0), false); verifyPaintPosition(key2, const Offset(0.0, 0.0), true); verifyActualBoxPosition(tester, find.byType(Container), 0, Rect.fromLTWH(0.0, 0.0, 800.0, delegate.maxExtent * 0.9)); verifyPaintPosition(key3, Offset(0.0, delegate.maxExtent * 0.9), true); position.animateTo(bigHeight + delegate.maxExtent * 0.5, curve: Curves.linear, duration: const Duration(minutes: 1)); await tester.pumpAndSettle(const Duration(milliseconds: 1000)); verifyPaintPosition(key1, const Offset(0.0, 0.0), false); verifyPaintPosition(key2, const Offset(0.0, 0.0), true); verifyActualBoxPosition(tester, find.byType(Container), 0, Rect.fromLTWH(0.0, 0.0, 800.0, delegate.maxExtent * 0.5)); verifyPaintPosition(key3, Offset(0.0, delegate.maxExtent * 0.5), true); position.animateTo(bigHeight + delegate.maxExtent * 0.9, curve: Curves.linear, duration: const Duration(minutes: 1)); await tester.pumpAndSettle(const Duration(milliseconds: 1000)); verifyPaintPosition(key1, const Offset(0.0, 0.0), false); verifyPaintPosition(key2, const Offset(0.0, 0.0), true); verifyActualBoxPosition(tester, find.byType(Container), 0, Rect.fromLTWH(0.0, -delegate.maxExtent * 0.4, 800.0, delegate.maxExtent * 0.5)); verifyPaintPosition(key3, Offset(0.0, delegate.maxExtent * 0.1), true); position.animateTo(bigHeight + delegate.maxExtent * 2.0, curve: Curves.linear, duration: const Duration(minutes: 1)); await tester.pumpAndSettle(const Duration(milliseconds: 1000)); verifyPaintPosition(key1, const Offset(0.0, 0.0), false); verifyPaintPosition(key2, const Offset(0.0, 0.0), false); verifyPaintPosition(key3, const Offset(0.0, 0.0), true); }); testWidgets('Sliver appbars - floating - no floating behavior when animating', (WidgetTester tester) async { final TestDelegate delegate = TestDelegate(); const double bigHeight = 1000.0; GlobalKey key1, key2, key3; await tester.pumpWidget( Directionality( textDirection: TextDirection.ltr, child: CustomScrollView( slivers: <Widget>[ BigSliver(key: key1 = GlobalKey(), height: bigHeight), SliverPersistentHeader(key: key2 = GlobalKey(), delegate: delegate, floating: true), BigSliver(key: key3 = GlobalKey(), height: bigHeight), ], ), ), ); final ScrollPosition position = tester.state<ScrollableState>(find.byType(Scrollable)).position; verifyPaintPosition(key1, const Offset(0.0, 0.0), true); verifyPaintPosition(key2, const Offset(0.0, 1000.0), false); verifyPaintPosition(key3, const Offset(0.0, 1200.0), false); position.animateTo(bigHeight + delegate.maxExtent * 2.0, curve: Curves.linear, duration: const Duration(minutes: 1)); await tester.pumpAndSettle(const Duration(milliseconds: 1000)); verifyPaintPosition(key1, const Offset(0.0, 0.0), false); verifyPaintPosition(key2, const Offset(0.0, 0.0), false); verifyPaintPosition(key3, const Offset(0.0, 0.0), true); position.animateTo(bigHeight + delegate.maxExtent * 1.9, curve: Curves.linear, duration: const Duration(minutes: 1)); await tester.pumpAndSettle(const Duration(milliseconds: 1000)); verifyPaintPosition(key1, const Offset(0.0, 0.0), false); verifyPaintPosition(key2, const Offset(0.0, 0.0), false); verifyPaintPosition(key3, const Offset(0.0, 0.0), true); }); testWidgets('Sliver appbars - floating - floating behavior when dragging down', (WidgetTester tester) async { final TestDelegate delegate = TestDelegate(); const double bigHeight = 1000.0; GlobalKey key1, key2, key3; await tester.pumpWidget( Directionality( textDirection: TextDirection.ltr, child: CustomScrollView( slivers: <Widget>[ BigSliver(key: key1 = GlobalKey(), height: bigHeight), SliverPersistentHeader(key: key2 = GlobalKey(), delegate: delegate, floating: true), BigSliver(key: key3 = GlobalKey(), height: bigHeight), ], ), ), ); final ScrollPositionWithSingleContext position = tester.state<ScrollableState>(find.byType(Scrollable)).position; verifyPaintPosition(key1, const Offset(0.0, 0.0), true); verifyPaintPosition(key2, const Offset(0.0, 1000.0), false); verifyPaintPosition(key3, const Offset(0.0, 1200.0), false); position.animateTo(bigHeight + delegate.maxExtent * 2.0, curve: Curves.linear, duration: const Duration(minutes: 1)); await tester.pumpAndSettle(const Duration(milliseconds: 1000)); verifyPaintPosition(key1, const Offset(0.0, 0.0), false); verifyPaintPosition(key2, const Offset(0.0, 0.0), false); verifyPaintPosition(key3, const Offset(0.0, 0.0), true); position.animateTo(bigHeight + delegate.maxExtent * 1.9, curve: Curves.linear, duration: const Duration(minutes: 1)); position.updateUserScrollDirection(ScrollDirection.forward); await tester.pumpAndSettle(const Duration(milliseconds: 1000)); verifyPaintPosition(key1, const Offset(0.0, 0.0), false); verifyPaintPosition(key2, const Offset(0.0, 0.0), true); verifyActualBoxPosition(tester, find.byType(Container), 0, Rect.fromLTWH(0.0, -delegate.maxExtent * 0.4, 800.0, delegate.maxExtent * 0.5)); verifyPaintPosition(key3, const Offset(0.0, 0.0), true); }); testWidgets('Sliver appbars - floating - overscroll gap is below header', (WidgetTester tester) async { await tester.pumpWidget( Directionality( textDirection: TextDirection.ltr, child: CustomScrollView( physics: const BouncingScrollPhysics(), slivers: <Widget>[ SliverPersistentHeader(delegate: TestDelegate(), floating: true), SliverList( delegate: SliverChildListDelegate(<Widget>[ const SizedBox( height: 300.0, child: Text('X'), ), ]), ), ], ), ), ); expect(tester.getTopLeft(find.byType(Container)), Offset.zero); expect(tester.getTopLeft(find.text('X')), const Offset(0.0, 200.0)); final ScrollPosition position = tester.state<ScrollableState>(find.byType(Scrollable)).position; position.jumpTo(-50.0); await tester.pump(); expect(tester.getTopLeft(find.byType(Container)), Offset.zero); expect(tester.getTopLeft(find.text('X')), const Offset(0.0, 250.0)); }); } class TestDelegate extends SliverPersistentHeaderDelegate { @override double get maxExtent => 200.0; @override double get minExtent => 100.0; @override Widget build(BuildContext context, double shrinkOffset, bool overlapsContent) { return Container(constraints: BoxConstraints(minHeight: minExtent, maxHeight: maxExtent)); } @override bool shouldRebuild(TestDelegate oldDelegate) => false; } class RenderBigSliver extends RenderSliver { RenderBigSliver(double height) : _height = height; double get height => _height; double _height; set height(double value) { if (value == _height) return; _height = value; markNeedsLayout(); } double get paintExtent => (height - constraints.scrollOffset).clamp(0.0, constraints.remainingPaintExtent); @override void performLayout() { geometry = SliverGeometry( scrollExtent: height, paintExtent: paintExtent, maxPaintExtent: height, ); } } class BigSliver extends LeafRenderObjectWidget { const BigSliver({ Key key, this.height }) : super(key: key); final double height; @override RenderBigSliver createRenderObject(BuildContext context) { return RenderBigSliver(height); } @override void updateRenderObject(BuildContext context, RenderBigSliver renderObject) { renderObject.height = height; } }