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135 lines
3.7 KiB
Dart
135 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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GlobalKey scrollableListKey;
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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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scrollableListKey = new GlobalKey();
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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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scrollableKey: scrollableListKey,
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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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ScrollableState get scrollableState => scrollableListKey.currentState;
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double get scrollOffset => scrollableState.scrollOffset;
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set scrollOffset(double value) {
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scrollableState.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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scrollableState.fling(velocity).whenComplete(completer.complete);
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return completer;
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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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await tester.pumpWidget(buildFrame());
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scrollOffset = 0.0;
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await tester.pump();
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expect(scrollOffset, 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(scrollOffset, closeTo(200.0, 1.0));
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expect(completer.isCompleted, isTrue);
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scrollOffset = 0.0;
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await tester.pump();
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expect(scrollOffset, 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(scrollOffset, closeTo(400.0, 1.0));
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expect(completer.isCompleted, isTrue);
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scrollOffset = 400.0;
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await tester.pump();
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expect(scrollOffset, 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(scrollOffset, closeTo(0.0, 1.0));
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expect(completer.isCompleted, isTrue);
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scrollOffset = 800.0;
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await tester.pump();
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expect(scrollOffset, 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(scrollOffset, closeTo(200.0, 1.0));
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expect(completer.isCompleted, isTrue);
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scrollOffset = 800.0;
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await tester.pump();
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expect(scrollOffset, 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(scrollOffset, closeTo(200.0, 1.0));
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});
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}
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