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// Copyright 2014 The Flutter 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/cupertino.dart';
import 'package:flutter_test/flutter_test.dart';
import '../rendering/mock_canvas.dart';
const Color _kScrollbarColor = Color(0x59000000);
// The `y` offset has to be larger than `ScrollDragController._bigThresholdBreakDistance`
// to prevent [motionStartDistanceThreshold] from affecting the actual drag distance.
const Offset _kGestureOffset = Offset(0, -25);
const Radius _kScrollbarRadius = Radius.circular(1.5);
void main() {
testWidgets('Paints iOS spec', (WidgetTester tester) async {
await tester.pumpWidget(
const Directionality(
textDirection: TextDirection.ltr,
child: MediaQuery(
data: MediaQueryData(),
child: CupertinoScrollbar(
child: SingleChildScrollView(
child: SizedBox(width: 4000.0, height: 4000.0),
),
),
),
),
);
expect(find.byType(CupertinoScrollbar), isNot(paints..rrect()));
final TestGesture gesture = await tester.startGesture(tester.getCenter(find.byType(SingleChildScrollView)));
await gesture.moveBy(_kGestureOffset);
// Move back to original position.
await gesture.moveBy(Offset.zero.translate(-_kGestureOffset.dx, -_kGestureOffset.dy));
await tester.pump();
await tester.pump(const Duration(milliseconds: 500));
expect(find.byType(CupertinoScrollbar), paints..rrect(
color: _kScrollbarColor,
rrect: RRect.fromRectAndRadius(
const Rect.fromLTWH(
800.0 - 3 - 3, // Screen width - margin - thickness.
3.0, // Initial position is the top margin.
3, // Thickness.
// Fraction in viewport * scrollbar height - top, bottom margin.
600.0 / 4000.0 * (600.0 - 2 * 3),
),
_kScrollbarRadius,
),
));
});
testWidgets('Paints iOS spec with nav bar', (WidgetTester tester) async {
await tester.pumpWidget(
CupertinoApp(
home: MediaQuery(
data: const MediaQueryData(
padding: EdgeInsets.fromLTRB(0, 20, 0, 34),
),
child: CupertinoPageScaffold(
navigationBar: const CupertinoNavigationBar(
middle: Text('Title'),
backgroundColor: Color(0x11111111),
),
child: CupertinoScrollbar(
child: ListView(
children: const <Widget> [SizedBox(width: 4000, height: 4000)]
),
),
),
),
),
);
final TestGesture gesture = await tester.startGesture(tester.getCenter(find.byType(ListView)));
await gesture.moveBy(_kGestureOffset);
// Move back to original position.
await gesture.moveBy(Offset(-_kGestureOffset.dx, -_kGestureOffset.dy));
await tester.pump();
await tester.pump(const Duration(milliseconds: 500));
expect(find.byType(CupertinoScrollbar), paints..rrect(
color: _kScrollbarColor,
rrect: RRect.fromRectAndRadius(
const Rect.fromLTWH(
800.0 - 3 - 3, // Screen width - margin - thickness.
44 + 20 + 3.0, // nav bar height + top margin
3, // Thickness.
// Fraction visible * (viewport size - padding - margin)
// where Fraction visible = (viewport size - padding) / content size
(600.0 - 34 - 44 - 20) / 4000.0 * (600.0 - 2 * 3 - 34 - 44 - 20),
),
_kScrollbarRadius,
),
));
});
testWidgets("should not paint when there isn't enough space", (WidgetTester tester) async {
await tester.pumpWidget(
CupertinoApp(
home: MediaQuery(
data: const MediaQueryData(
padding: EdgeInsets.fromLTRB(0, 20, 0, 34),
),
child: CupertinoPageScaffold(
navigationBar: const CupertinoNavigationBar(
middle: Text('Title'),
backgroundColor: Color(0x11111111),
),
child: CupertinoScrollbar(
child: ListView(
physics: const AlwaysScrollableScrollPhysics(parent: BouncingScrollPhysics()),
children: const <Widget> [SizedBox(width: 10, height: 10)],
),
),
),
),
),
);
final TestGesture gesture = await tester.startGesture(tester.getCenter(find.byType(ListView)));
await gesture.moveBy(_kGestureOffset);
// Move back to original position.
await gesture.moveBy(Offset(-_kGestureOffset.dx, -_kGestureOffset.dy));
await tester.pump();
await tester.pump(const Duration(milliseconds: 500));
expect(find.byType(CupertinoScrollbar), isNot(paints..rrect()));
// The scrollbar should not appear even when overscrolled.
final TestGesture overscrollGesture = await tester.startGesture(tester.getCenter(find.byType(ListView)));
await overscrollGesture.moveBy(_kGestureOffset);
await tester.pump();
await tester.pump(const Duration(milliseconds: 500));
expect(find.byType(CupertinoScrollbar), isNot(paints..rrect()));
});
}