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06f879b57e
Also, move the creation of the ScrollPosition to ScrollController. Finally, remove TestScrollable in favor of CustomScrollView, which is the production version of this widget.
111 lines
3.6 KiB
Dart
111 lines
3.6 KiB
Dart
// Copyright 2016 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'dart:math' as math;
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import 'package:flutter_test/flutter_test.dart';
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import 'package:flutter/rendering.dart';
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import 'package:flutter/widgets.dart';
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void verifyPaintPosition(GlobalKey key, Offset ideal) {
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RenderObject target = key.currentContext.findRenderObject();
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expect(target.parent, new isInstanceOf<RenderViewport2>());
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SliverPhysicalParentData parentData = target.parentData;
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Offset actual = parentData.paintOffset;
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expect(actual, ideal);
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}
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void main() {
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testWidgets('Sliver protocol', (WidgetTester tester) async {
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GlobalKey key1, key2, key3, key4, key5;
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await tester.pumpWidget(
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new CustomScrollView(
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slivers: <Widget>[
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new BigSliver(key: key1 = new GlobalKey()),
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new OverlappingSliver(key: key2 = new GlobalKey()),
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new OverlappingSliver(key: key3 = new GlobalKey()),
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new BigSliver(key: key4 = new GlobalKey()),
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new BigSliver(key: key5 = new GlobalKey()),
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],
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),
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);
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ScrollPosition position = tester.state<Scrollable2State>(find.byType(Scrollable2)).position;
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final double max = RenderBigSliver.height * 3.0 + (RenderOverlappingSliver.totalHeight) * 2.0 - 600.0; // 600 is the height of the test viewport
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assert(max < 10000.0);
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expect(max, 1450.0);
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expect(position.pixels, 0.0);
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expect(position.minScrollExtent, 0.0);
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expect(position.maxScrollExtent, max);
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position.animateTo(10000.0, curve: Curves.linear, duration: const Duration(minutes: 1));
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await tester.pumpUntilNoTransientCallbacks(const Duration(milliseconds: 10));
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expect(position.pixels, max);
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expect(position.minScrollExtent, 0.0);
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expect(position.maxScrollExtent, max);
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verifyPaintPosition(key1, new Offset(0.0, 0.0));
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verifyPaintPosition(key2, new Offset(0.0, 0.0));
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verifyPaintPosition(key3, new Offset(0.0, 0.0));
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verifyPaintPosition(key4, new Offset(0.0, 0.0));
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verifyPaintPosition(key5, new Offset(0.0, 50.0));
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});
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}
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class RenderBigSliver extends RenderSliver {
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static const double height = 550.0;
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double get paintExtent => (height - constraints.scrollOffset).clamp(0.0, constraints.remainingPaintExtent);
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@override
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void performLayout() {
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geometry = new SliverGeometry(
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scrollExtent: height,
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paintExtent: paintExtent,
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maxPaintExtent: height,
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);
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}
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}
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class BigSliver extends LeafRenderObjectWidget {
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BigSliver({ Key key }) : super(key: key);
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@override
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RenderBigSliver createRenderObject(BuildContext context) {
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return new RenderBigSliver();
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}
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}
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class RenderOverlappingSliver extends RenderSliver {
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static const double totalHeight = 200.0;
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static const double fixedHeight = 100.0;
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double get paintExtent {
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return math.min(
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math.max(
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fixedHeight,
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totalHeight - constraints.scrollOffset,
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),
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constraints.remainingPaintExtent,
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);
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}
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double get layoutExtent {
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return (totalHeight - constraints.scrollOffset).clamp(0.0, constraints.remainingPaintExtent);
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}
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@override
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void performLayout() {
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geometry = new SliverGeometry(
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scrollExtent: totalHeight,
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paintExtent: paintExtent,
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layoutExtent: layoutExtent,
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maxPaintExtent: totalHeight,
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);
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}
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}
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class OverlappingSliver extends LeafRenderObjectWidget {
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OverlappingSliver({ Key key }) : super(key: key);
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@override
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RenderOverlappingSliver createRenderObject(BuildContext context) {
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return new RenderOverlappingSliver();
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}
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}
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