Commit a3ecdc30 authored by Hans Muller's avatar Hans Muller

Merge pull request #1400 from HansMuller/land_snap_scrolling_unit_test

Land snap_scrolling_test.dart
parents 6bd9229d 9b659089
// Copyright 2015 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:quiver/testing/async.dart';
import 'package:sky/src/fn3.dart';
import 'package:test/test.dart';
import '../fn3/widget_tester.dart';
const double itemExtent = 200.0;
ScrollDirection scrollDirection = ScrollDirection.vertical;
GlobalKey scrollableListKey;
Widget buildItem(BuildContext context, int item) {
return new Container(
key: new ValueKey<int>(item),
width: itemExtent,
height: itemExtent,
child: new Text(item.toString())
);
}
double snapOffsetCallback(double offset) {
return (offset / itemExtent).floor() * itemExtent;
}
Widget buildScrollableList() {
scrollableListKey = new GlobalKey();
return new Container(
height: itemExtent * 2.0,
child: new ScrollableList<int>(
key: scrollableListKey,
snapOffsetCallback: snapOffsetCallback,
scrollDirection: scrollDirection,
items: [0, 1, 2, 3, 4, 5, 7, 8, 9],
itemBuilder: buildItem,
itemExtent: itemExtent
)
);
}
ScrollableState get scrollableState => scrollableListKey.currentState;
double get scrollOffset => scrollableState.scrollOffset;
void set scrollOffset(double value) {
scrollableState.scrollTo(value);
}
void fling(double velocity) {
Offset velocityOffset = scrollDirection == ScrollDirection.vertical
? new Offset(0.0, velocity)
: new Offset(velocity, 0.0);
scrollableState.fling(velocityOffset);
}
void main() {
test('ScrollableList snap scrolling, fling(-800)', () {
WidgetTester tester = new WidgetTester();
tester.pumpFrame(new Center(child: buildScrollableList()));
expect(scrollOffset, 0.0);
new FakeAsync().run((async) {
fling(-800.0);
tester.pumpFrameWithoutChange(); // Start the scheduler at 0.0
tester.pumpFrameWithoutChange(1000.0);
async.elapse(new Duration(seconds: 1));
expect(scrollOffset, closeTo(200.0, 1.0));
});
});
test('ScrollableList snap scrolling, fling(-2000)', () {
WidgetTester tester = new WidgetTester();
tester.pumpFrame(new Center(child: buildScrollableList()));
expect(scrollOffset, 0.0);
new FakeAsync().run((async) {
fling(-2000.0);
tester.pumpFrameWithoutChange(); // Start the scheduler at 0.0
tester.pumpFrameWithoutChange(1000.0);
async.elapse(new Duration(seconds: 1));
expect(scrollOffset, closeTo(400.0, 1.0));
});
});
}
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