3a43fc88b6
This patch removes unnecessary uses of scrollableKey from tests. Scrollable2 will likely use a different mechanism for identifying itself, so we want to focus on the uses of scrollableKey that will need to be addressed in the new implementation.
132 lines
3.7 KiB
Dart
132 lines
3.7 KiB
Dart
// Copyright 2015 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:async';
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import 'package:flutter_test/flutter_test.dart';
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import 'package:flutter/widgets.dart';
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const double itemExtent = 200.0;
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Axis scrollDirection = Axis.vertical;
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Widget buildItem(int item) {
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return new Container(
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width: itemExtent,
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height: itemExtent,
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child: new Text(item.toString())
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);
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}
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double snapOffsetCallback(double offset, Size size) {
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return (offset / itemExtent).floor() * itemExtent;
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}
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class TestScrollConfigurationDelegate extends ScrollConfigurationDelegate {
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const TestScrollConfigurationDelegate();
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// Not testing platform-specific fling scrolling, use the default fling
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// decleration simulation.
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@override
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TargetPlatform get platform => null;
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@override
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ExtentScrollBehavior createScrollBehavior() => new OverscrollWhenScrollableBehavior(platform: platform);
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@override
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bool updateShouldNotify(ScrollConfigurationDelegate old) => false;
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}
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Widget buildFrame() {
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return new ScrollConfiguration(
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delegate: const TestScrollConfigurationDelegate(),
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child: new Center(
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child: new Container(
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height: itemExtent * 2.0,
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child: new ScrollableList(
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snapOffsetCallback: snapOffsetCallback,
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scrollDirection: scrollDirection,
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itemExtent: itemExtent,
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children: <int>[0, 1, 2, 3, 4, 5, 7, 8, 9].map(buildItem)
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)
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)
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)
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);
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}
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void main() {
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testWidgets('ScrollableList snap scrolling', (WidgetTester tester) async {
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ScrollableState getScrollableState() => tester.state(find.byType(Scrollable));
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double getScrollOffset() => getScrollableState().scrollOffset;
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void setScrollOffset(double value) {
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getScrollableState().scrollTo(value);
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}
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Completer<Null> fling(double velocity) {
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Completer<Null> completer = new Completer<Null>();
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getScrollableState().fling(velocity).whenComplete(completer.complete);
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return completer;
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}
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await tester.pumpWidget(buildFrame());
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setScrollOffset(0.0);
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await tester.pump();
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expect(getScrollOffset(), 0.0);
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Duration dt = const Duration(seconds: 2);
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Completer<Null> completer = fling(1000.0);
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expect(completer.isCompleted, isFalse);
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await tester.pump(); // Start the scheduler at 0.0
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await tester.pump(dt);
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expect(getScrollOffset(), closeTo(200.0, 1.0));
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expect(completer.isCompleted, isTrue);
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setScrollOffset(0.0);
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await tester.pump();
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expect(getScrollOffset(), 0.0);
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completer = fling(2000.0);
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expect(completer.isCompleted, isFalse);
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await tester.pump();
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await tester.pump(dt);
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expect(getScrollOffset(), closeTo(400.0, 1.0));
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expect(completer.isCompleted, isTrue);
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setScrollOffset(400.0);
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await tester.pump();
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expect(getScrollOffset(), 400.0);
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completer = fling(-800.0);
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expect(completer.isCompleted, isFalse);
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await tester.pump();
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await tester.pump(dt);
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expect(getScrollOffset(), closeTo(0.0, 1.0));
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expect(completer.isCompleted, isTrue);
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setScrollOffset(800.0);
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await tester.pump();
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expect(getScrollOffset(), 800.0);
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completer = fling(-2000.0);
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expect(completer.isCompleted, isFalse);
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await tester.pump();
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await tester.pump(dt);
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expect(getScrollOffset(), closeTo(200.0, 1.0));
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expect(completer.isCompleted, isTrue);
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setScrollOffset(800.0);
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await tester.pump();
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expect(getScrollOffset(), 800.0);
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completer = fling(-2000.0);
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expect(completer.isCompleted, isFalse);
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await tester.pump();
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await tester.pump(dt);
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expect(completer.isCompleted, isTrue);
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expectSync(getScrollOffset(), closeTo(200.0, 1.0));
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});
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}
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