flutter_flutter/packages/flutter/test/widget/scroll_behavior_test.dart
2016-02-10 12:13:20 -08:00

38 lines
1.1 KiB
Dart

// 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:flutter/widgets.dart';
import 'package:test/test.dart';
void main() {
test('BoundedBehavior min scroll offset', () {
BoundedBehavior behavior = new BoundedBehavior(
contentExtent: 150.0,
containerExtent: 75.0,
minScrollOffset: -100.0
);
expect(behavior.minScrollOffset, equals(-100.0));
expect(behavior.maxScrollOffset, equals(-25.0));
double scrollOffset = behavior.updateExtents(
contentExtent: 125.0,
containerExtent: 50.0,
scrollOffset: -80.0
);
expect(behavior.minScrollOffset, equals(-100.0));
expect(behavior.maxScrollOffset, equals(-25.0));
expect(scrollOffset, equals(-80.0));
scrollOffset = behavior.updateExtents(
minScrollOffset: 50.0,
scrollOffset: scrollOffset
);
expect(behavior.minScrollOffset, equals(50.0));
expect(behavior.maxScrollOffset, equals(125.0));
expect(scrollOffset, equals(50.0));
});
}