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Reland 39919 CupertinoPicker (#47837)

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LongCatIsLooong 2019-12-26 17:26:55 -08:00 committed by GitHub
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commit ae24f18414
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7 changed files with 239 additions and 292 deletions
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14
packages/flutter/lib/src/cupertino/date_picker.dart
View File

@ -24,8 +24,6 @@ const double _kDatePickerPadSize = 12.0;
// The density of a date picker is different from a generic picker.
// Eyeballed from iOS.
const double _kSqueeze = 1.25;
// Considers setting the default background color from the theme, in the future.
const Color _kBackgroundColor = CupertinoColors.white;
const TextStyle _kDefaultPickerTextStyle = TextStyle(
letterSpacing: -0.83,
@ -230,12 +228,11 @@ class CupertinoDatePicker extends StatefulWidget {
this.maximumYear,
this.minuteInterval = 1,
this.use24hFormat = false,
this.backgroundColor = _kBackgroundColor,
this.backgroundColor,
}) : initialDateTime = initialDateTime ?? DateTime.now(),
assert(mode != null),
assert(onDateTimeChanged != null),
assert(minimumYear != null),
assert(backgroundColor != null),
assert(
minuteInterval > 0 && 60 % minuteInterval == 0,
'minute interval is not a positive integer factor of 60',
@ -313,7 +310,7 @@ class CupertinoDatePicker extends StatefulWidget {
/// Background color of date picker.
///
/// Defaults to [CupertinoColors.white] when null.
/// Defaults to null, which disables background painting entirely.
final Color backgroundColor;
@override
@ -1242,7 +1239,7 @@ class CupertinoTimerPicker extends StatefulWidget {
this.minuteInterval = 1,
this.secondInterval = 1,
this.alignment = Alignment.center,
this.backgroundColor = _kBackgroundColor,
this.backgroundColor,
@required this.onTimerDurationChanged,
}) : assert(mode != null),
assert(onTimerDurationChanged != null),
@ -1252,7 +1249,6 @@ class CupertinoTimerPicker extends StatefulWidget {
assert(secondInterval > 0 && 60 % secondInterval == 0),
assert(initialTimerDuration.inMinutes % minuteInterval == 0),
assert(initialTimerDuration.inSeconds % secondInterval == 0),
assert(backgroundColor != null),
assert(alignment != null),
super(key: key);
@ -1280,7 +1276,7 @@ class CupertinoTimerPicker extends StatefulWidget {
/// Background color of timer picker.
///
/// Defaults to [CupertinoColors.white] when null.
/// Defaults to null, which disables background painting entirely.
final Color backgroundColor;
@override
@ -1687,7 +1683,7 @@ class _CupertinoTimerPickerState extends State<CupertinoTimerPicker> {
child: Align(
alignment: widget.alignment,
child: Container(
color: _kBackgroundColor,
color: CupertinoDynamicColor.resolve(widget.backgroundColor, context),
width: totalWidth,
height: _kPickerHeight,
child: DefaultTextStyle(

138
packages/flutter/lib/src/cupertino/picker.dart
View File

@ -7,19 +7,23 @@ import 'package:flutter/rendering.dart';
import 'package:flutter/services.dart';
import 'package:flutter/widgets.dart';
import 'colors.dart';
import 'theme.dart';
/// Color of the 'magnifier' lens border.
const Color _kHighlighterBorder = Color(0xFF7F7F7F);
const Color _kDefaultBackground = Color(0xFFD2D4DB);
const Color _kHighlighterBorder = CupertinoDynamicColor.withBrightness(
color: Color(0x33000000),
darkColor: Color(0x33FFFFFF),
);
// Eyeballed values comparing with a native picker to produce the right
// curvatures and densities.
const double _kDefaultDiameterRatio = 1.07;
const double _kDefaultPerspective = 0.003;
const double _kSqueeze = 1.45;
/// Opacity fraction value that hides the wheel above and below the 'magnifier'
/// lens with the same color as the background.
const double _kForegroundScreenOpacityFraction = 0.7;
// Opacity fraction value that dims the wheel above and below the "magnifier"
// lens.
const double _kOverAndUnderCenterOpacity = 0.447;
/// An iOS-styled picker.
///
@ -65,7 +69,7 @@ class CupertinoPicker extends StatefulWidget {
CupertinoPicker({
Key key,
this.diameterRatio = _kDefaultDiameterRatio,
this.backgroundColor = _kDefaultBackground,
this.backgroundColor,
this.offAxisFraction = 0.0,
this.useMagnifier = false,
this.magnification = 1.0,
@ -108,7 +112,7 @@ class CupertinoPicker extends StatefulWidget {
CupertinoPicker.builder({
Key key,
this.diameterRatio = _kDefaultDiameterRatio,
this.backgroundColor = _kDefaultBackground,
this.backgroundColor,
this.offAxisFraction = 0.0,
this.useMagnifier = false,
this.magnification = 1.0,
@ -245,110 +249,32 @@ class _CupertinoPickerState extends State<CupertinoPicker> {
}
}
/// Makes the fade to [CupertinoPicker.backgroundColor] edge gradients.
Widget _buildGradientScreen() {
// Because BlendMode.dstOut doesn't work correctly with BoxDecoration we
// have to just do a color blend. And a due to the way we are layering
// the magnifier and the gradient on the background, using a transparent
// background color makes the picker look odd.
if (widget.backgroundColor != null && widget.backgroundColor.alpha < 255)
return Container();
final Color widgetBackgroundColor = widget.backgroundColor ?? const Color(0xFFFFFFFF);
return Positioned.fill(
child: IgnorePointer(
child: Container(
decoration: BoxDecoration(
gradient: LinearGradient(
colors: <Color>[
widgetBackgroundColor,
widgetBackgroundColor.withAlpha(0xF2),
widgetBackgroundColor.withAlpha(0xDD),
widgetBackgroundColor.withAlpha(0),
widgetBackgroundColor.withAlpha(0),
widgetBackgroundColor.withAlpha(0xDD),
widgetBackgroundColor.withAlpha(0xF2),
widgetBackgroundColor,
],
stops: const <double>[
0.0, 0.05, 0.09, 0.22, 0.78, 0.91, 0.95, 1.0,
],
begin: Alignment.topCenter,
end: Alignment.bottomCenter,
),
),
),
),
);
}
/// Makes the magnifier lens look so that the colors are normal through
/// the lens and partially grayed out around it.
/// Draws the magnifier borders.
Widget _buildMagnifierScreen() {
final Color foreground = widget.backgroundColor?.withAlpha(
(widget.backgroundColor.alpha * _kForegroundScreenOpacityFraction).toInt()
);
final Color resolvedBorderColor = CupertinoDynamicColor.resolve(_kHighlighterBorder, context);
return IgnorePointer(
child: Column(
children: <Widget>[
Expanded(
child: Container(
color: foreground,
child: Center(
child: Container(
decoration: BoxDecoration(
border: Border(
top: BorderSide(width: 0.0, color: resolvedBorderColor),
bottom: BorderSide(width: 0.0, color: resolvedBorderColor),
),
),
Container(
decoration: const BoxDecoration(
border: Border(
top: BorderSide(width: 0.0, color: _kHighlighterBorder),
bottom: BorderSide(width: 0.0, color: _kHighlighterBorder),
),
),
constraints: BoxConstraints.expand(
height: widget.itemExtent * widget.magnification,
),
),
Expanded(
child: Container(
color: foreground,
),
),
],
),
);
}
Widget _buildUnderMagnifierScreen() {
final Color foreground = widget.backgroundColor?.withAlpha(
(widget.backgroundColor.alpha * _kForegroundScreenOpacityFraction).toInt()
);
return Column(
children: <Widget>[
Expanded(child: Container()),
Container(
color: foreground,
constraints: BoxConstraints.expand(
height: widget.itemExtent * widget.magnification,
),
),
Expanded(child: Container()),
],
);
}
Widget _addBackgroundToChild(Widget child) {
return DecoratedBox(
decoration: BoxDecoration(
color: widget.backgroundColor,
),
child: child,
);
}
@override
Widget build(BuildContext context) {
Widget result = DefaultTextStyle(
final Color resolvedBackgroundColor = CupertinoDynamicColor.resolve(widget.backgroundColor, context);
final Widget result = DefaultTextStyle(
style: CupertinoTheme.of(context).textTheme.pickerTextStyle,
child: Stack(
children: <Widget>[
@ -363,6 +289,7 @@ class _CupertinoPickerState extends State<CupertinoPicker> {
offAxisFraction: widget.offAxisFraction,
useMagnifier: widget.useMagnifier,
magnification: widget.magnification,
overAndUnderCenterOpacity: _kOverAndUnderCenterOpacity,
itemExtent: widget.itemExtent,
squeeze: widget.squeeze,
onSelectedItemChanged: _handleSelectedItemChanged,
@ -370,24 +297,15 @@ class _CupertinoPickerState extends State<CupertinoPicker> {
),
),
),
_buildGradientScreen(),
_buildMagnifierScreen(),
],
),
);
// Adds the appropriate opacity under the magnifier if the background
// color is transparent.
if (widget.backgroundColor != null && widget.backgroundColor.alpha < 255) {
result = Stack(
children: <Widget> [
_buildUnderMagnifierScreen(),
_addBackgroundToChild(result),
],
);
} else {
result = _addBackgroundToChild(result);
}
return result;
return DecoratedBox(
decoration: BoxDecoration(color: resolvedBackgroundColor),
child: result,
);
}
}

119
packages/flutter/lib/src/rendering/list_wheel_viewport.dart
View File

@ -140,6 +140,7 @@ class RenderListWheelViewport
double offAxisFraction = 0,
bool useMagnifier = false,
double magnification = 1,
double overAndUnderCenterOpacity = 1,
@required double itemExtent,
double squeeze = 1,
bool clipToSize = true,
@ -156,6 +157,8 @@ class RenderListWheelViewport
assert(useMagnifier != null),
assert(magnification != null),
assert(magnification > 0),
assert(overAndUnderCenterOpacity != null),
assert(overAndUnderCenterOpacity >= 0 && overAndUnderCenterOpacity <= 1),
assert(itemExtent != null),
assert(squeeze != null),
assert(squeeze > 0),
@ -172,6 +175,7 @@ class RenderListWheelViewport
_offAxisFraction = offAxisFraction,
_useMagnifier = useMagnifier,
_magnification = magnification,
_overAndUnderCenterOpacity = overAndUnderCenterOpacity,
_itemExtent = itemExtent,
_squeeze = squeeze,
_clipToSize = clipToSize,
@ -368,6 +372,25 @@ class RenderListWheelViewport
markNeedsPaint();
}
/// {@template flutter.rendering.wheelList.overAndUnderCenterOpacity}
/// The opacity value that will be applied to the wheel that appears below and
/// above the magnifier.
///
/// The default value is 1.0, which will not change anything.
///
/// Must be greater than or equal to 0, and less than or equal to 1.
/// {@endtemplate}
double get overAndUnderCenterOpacity => _overAndUnderCenterOpacity;
double _overAndUnderCenterOpacity = 1.0;
set overAndUnderCenterOpacity(double value) {
assert(value != null);
assert(value >= 0 && value <= 1);
if (value == _overAndUnderCenterOpacity)
return;
_overAndUnderCenterOpacity = value;
markNeedsPaint();
}
/// {@template flutter.rendering.wheelList.itemExtent}
/// The size of the children along the main axis. Children [RenderBox]es will
/// be given the [BoxConstraints] of this exact size.
@ -822,20 +845,16 @@ class RenderListWheelViewport
// Offset that helps painting everything in the center (e.g. angle = 0).
final Offset offsetToCenter = Offset(
untransformedPaintingCoordinates.dx,
-_topScrollMarginExtent);
untransformedPaintingCoordinates.dx,
-_topScrollMarginExtent,
);
if (!useMagnifier)
final bool shouldApplyOffCenterDim = overAndUnderCenterOpacity < 1;
if (useMagnifier || shouldApplyOffCenterDim) {
_paintChildWithMagnifier(context, offset, child, transform, offsetToCenter, untransformedPaintingCoordinates);
} else {
_paintChildCylindrically(context, offset, child, transform, offsetToCenter);
else
_paintChildWithMagnifier(
context,
offset,
child,
transform,
offsetToCenter,
untransformedPaintingCoordinates,
);
}
}
/// Paint child with the magnifier active - the child will be rendered
@ -878,36 +897,34 @@ class RenderListWheelViewport
// Clipping the part in the center.
context.pushClipRect(
false,
offset,
centerRect,
(PaintingContext context, Offset offset) {
context.pushTransform(
false,
offset,
_magnifyTransform(),
(PaintingContext context, Offset offset) {
context.paintChild(
child,
offset + untransformedPaintingCoordinates);
});
needsCompositing,
offset,
centerRect,
(PaintingContext context, Offset offset) {
context.pushTransform(
needsCompositing,
offset,
_magnifyTransform(),
(PaintingContext context, Offset offset) {
context.paintChild(child, offset + untransformedPaintingCoordinates);
});
});
// Clipping the part in either the top-half or bottom-half of the wheel.
context.pushClipRect(
false,
offset,
untransformedPaintingCoordinates.dy <= magnifierTopLinePosition
? topHalfRect
: bottomHalfRect,
(PaintingContext context, Offset offset) {
_paintChildCylindrically(
context,
offset,
child,
cylindricalTransform,
offsetToCenter);
},
needsCompositing,
offset,
untransformedPaintingCoordinates.dy <= magnifierTopLinePosition
? topHalfRect
: bottomHalfRect,
(PaintingContext context, Offset offset) {
_paintChildCylindrically(
context,
offset,
child,
cylindricalTransform,
offsetToCenter);
},
);
} else {
_paintChildCylindrically(
@ -927,20 +944,26 @@ class RenderListWheelViewport
Matrix4 cylindricalTransform,
Offset offsetToCenter,
) {
// Paint child cylindrically, without [overAndUnderCenterOpacity].
final PaintingContextCallback painter = (PaintingContext context, Offset offset) {
context.paintChild(
child,
// Paint everything in the center (e.g. angle = 0), then transform.
offset + offsetToCenter,
);
};
// Paint child cylindrically, with [overAndUnderCenterOpacity].
final PaintingContextCallback opacityPainter = (PaintingContext context, Offset offset) {
context.pushOpacity(offset, (overAndUnderCenterOpacity * 255).round(), painter);
};
context.pushTransform(
// Text with TransformLayers and no cullRects currently have an issue rendering
// https://github.com/flutter/flutter/issues/14224.
false,
needsCompositing,
offset,
_centerOriginTransform(cylindricalTransform),
// Pre-transform painting function.
(PaintingContext context, Offset offset) {
context.paintChild(
child,
// Paint everything in the center (e.g. angle = 0), then transform.
offset + offsetToCenter,
);
},
overAndUnderCenterOpacity == 1 ? painter : opacityPainter,
);
}

18
packages/flutter/lib/src/widgets/list_wheel_scroll_view.dart
View File

@ -575,6 +575,7 @@ class ListWheelScrollView extends StatefulWidget {
this.offAxisFraction = 0.0,
this.useMagnifier = false,
this.magnification = 1.0,
this.overAndUnderCenterOpacity = 1.0,
@required this.itemExtent,
this.squeeze = 1.0,
this.onSelectedItemChanged,
@ -588,6 +589,8 @@ class ListWheelScrollView extends StatefulWidget {
assert(perspective > 0),
assert(perspective <= 0.01, RenderListWheelViewport.perspectiveTooHighMessage),
assert(magnification > 0),
assert(overAndUnderCenterOpacity != null),
assert(overAndUnderCenterOpacity >= 0 && overAndUnderCenterOpacity <= 1),
assert(itemExtent != null),
assert(itemExtent > 0),
assert(squeeze != null),
@ -612,6 +615,7 @@ class ListWheelScrollView extends StatefulWidget {
this.offAxisFraction = 0.0,
this.useMagnifier = false,
this.magnification = 1.0,
this.overAndUnderCenterOpacity = 1.0,
@required this.itemExtent,
this.squeeze = 1.0,
this.onSelectedItemChanged,
@ -625,6 +629,8 @@ class ListWheelScrollView extends StatefulWidget {
assert(perspective > 0),
assert(perspective <= 0.01, RenderListWheelViewport.perspectiveTooHighMessage),
assert(magnification > 0),
assert(overAndUnderCenterOpacity != null),
assert(overAndUnderCenterOpacity >= 0 && overAndUnderCenterOpacity <= 1),
assert(itemExtent != null),
assert(itemExtent > 0),
assert(squeeze != null),
@ -677,6 +683,9 @@ class ListWheelScrollView extends StatefulWidget {
/// {@macro flutter.rendering.wheelList.magnification}
final double magnification;
/// {@macro flutter.rendering.wheelList.overAndUnderCenterOpacity}
final double overAndUnderCenterOpacity;
/// Size of each child in the main axis. Must not be null and must be
/// positive.
final double itemExtent;
@ -757,6 +766,7 @@ class _ListWheelScrollViewState extends State<ListWheelScrollView> {
offAxisFraction: widget.offAxisFraction,
useMagnifier: widget.useMagnifier,
magnification: widget.magnification,
overAndUnderCenterOpacity: widget.overAndUnderCenterOpacity,
itemExtent: widget.itemExtent,
squeeze: widget.squeeze,
clipToSize: widget.clipToSize,
@ -952,6 +962,7 @@ class ListWheelViewport extends RenderObjectWidget {
this.offAxisFraction = 0.0,
this.useMagnifier = false,
this.magnification = 1.0,
this.overAndUnderCenterOpacity = 1.0,
@required this.itemExtent,
this.squeeze = 1.0,
this.clipToSize = true,
@ -965,6 +976,8 @@ class ListWheelViewport extends RenderObjectWidget {
assert(perspective != null),
assert(perspective > 0),
assert(perspective <= 0.01, RenderListWheelViewport.perspectiveTooHighMessage),
assert(overAndUnderCenterOpacity != null),
assert(overAndUnderCenterOpacity >= 0 && overAndUnderCenterOpacity <= 1),
assert(itemExtent != null),
assert(itemExtent > 0),
assert(squeeze != null),
@ -992,6 +1005,9 @@ class ListWheelViewport extends RenderObjectWidget {
/// {@macro flutter.rendering.wheelList.magnification}
final double magnification;
/// {@macro flutter.rendering.wheelList.overAndUnderCenterOpacity}
final double overAndUnderCenterOpacity;
/// {@macro flutter.rendering.wheelList.itemExtent}
final double itemExtent;
@ -1027,6 +1043,7 @@ class ListWheelViewport extends RenderObjectWidget {
offAxisFraction: offAxisFraction,
useMagnifier: useMagnifier,
magnification: magnification,
overAndUnderCenterOpacity: overAndUnderCenterOpacity,
itemExtent: itemExtent,
squeeze: squeeze,
clipToSize: clipToSize,
@ -1043,6 +1060,7 @@ class ListWheelViewport extends RenderObjectWidget {
..offAxisFraction = offAxisFraction
..useMagnifier = useMagnifier
..magnification = magnification
..overAndUnderCenterOpacity = overAndUnderCenterOpacity
..itemExtent = itemExtent
..squeeze = squeeze
..clipToSize = clipToSize

34
packages/flutter/test/cupertino/date_picker_test.dart
View File

@ -115,19 +115,20 @@ void main() {
);
final Iterable<CupertinoPicker> pickers = tester.allWidgets.whereType<CupertinoPicker>();
expect(pickers.any((CupertinoPicker picker) => picker.backgroundColor != CupertinoColors.white), false);
expect(pickers.any((CupertinoPicker picker) => picker.backgroundColor != null), false);
});
testWidgets('background color is not null', (WidgetTester tester) async {
expect(
() {
CupertinoTimerPicker(
testWidgets('background color can be null', (WidgetTester tester) async {
await tester.pumpWidget(
CupertinoApp(
home: CupertinoTimerPicker(
onTimerDurationChanged: (_) { },
backgroundColor: null,
);
},
throwsAssertionError,
),
),
);
expect(tester.takeException(), isNull);
});
testWidgets('specified background color is applied', (WidgetTester tester) async {
@ -316,19 +317,20 @@ void main() {
);
final Iterable<CupertinoPicker> pickers = tester.allWidgets.whereType<CupertinoPicker>();
expect(pickers.any((CupertinoPicker picker) => picker.backgroundColor != CupertinoColors.white), false);
expect(pickers.any((CupertinoPicker picker) => picker.backgroundColor != null), false);
});
testWidgets('background color is not null', (WidgetTester tester) async {
expect(
() {
CupertinoDatePicker(
testWidgets('background color can be null', (WidgetTester tester) async {
await tester.pumpWidget(
CupertinoApp(
home: CupertinoDatePicker(
onDateTimeChanged: (_) { },
backgroundColor: null,
);
},
throwsAssertionError,
),
),
);
expect(tester.takeException(), isNull);
});
testWidgets('specified background color is applied', (WidgetTester tester) async {

151
packages/flutter/test/cupertino/picker_test.dart
View File

@ -8,6 +8,8 @@ import 'package:flutter/rendering.dart';
import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
import '../rendering/mock_canvas.dart';
void main() {
testWidgets('Picker respects theme styling', (WidgetTester tester) async {
await tester.pumpWidget(
@ -95,125 +97,56 @@ void main() {
});
});
group('gradient', () {
testWidgets('gradient displays correctly with background color', (WidgetTester tester) async {
const Color backgroundColor = Color.fromRGBO(255, 0, 0, 1.0);
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Align(
alignment: Alignment.topLeft,
child: SizedBox(
height: 300.0,
width: 300.0,
child: CupertinoPicker(
backgroundColor: backgroundColor,
itemExtent: 15.0,
children: const <Widget>[
Text('1'),
Text('1'),
Text('1'),
Text('1'),
Text('1'),
Text('1'),
Text('1'),
],
onSelectedItemChanged: (int i) { },
testWidgets('picker dark mode', (WidgetTester tester) async {
await tester.pumpWidget(
CupertinoApp(
theme: const CupertinoThemeData(brightness: Brightness.light),
home: Align(
alignment: Alignment.topLeft,
child: SizedBox(
height: 300.0,
width: 300.0,
child: CupertinoPicker(
backgroundColor: const CupertinoDynamicColor.withBrightness(
color: Color(0xFF123456), // Set alpha channel to FF to disable under magnifier painting.
darkColor: Color(0xFF654321),
),
itemExtent: 15.0,
children: const <Widget>[Text('1'), Text('1')],
onSelectedItemChanged: (int i) { },
),
),
),
);
final Container container = tester.firstWidget(find.byType(Container));
final BoxDecoration boxDecoration = container.decoration as BoxDecoration;
expect(boxDecoration.gradient.colors, <Color>[
backgroundColor,
backgroundColor.withAlpha(0xF2),
backgroundColor.withAlpha(0xDD),
backgroundColor.withAlpha(0x00),
backgroundColor.withAlpha(0x00),
backgroundColor.withAlpha(0xDD),
backgroundColor.withAlpha(0xF2),
backgroundColor,
]);
});
),
);
testWidgets('No gradient displays with transparent background color', (WidgetTester tester) async {
const Color backgroundColor = Color.fromRGBO(255, 0, 0, 0.5);
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Align(
alignment: Alignment.topLeft,
child: SizedBox(
height: 300.0,
width: 300.0,
child: CupertinoPicker(
backgroundColor: backgroundColor,
itemExtent: 15.0,
children: const <Widget>[
Text('1'),
Text('1'),
Text('1'),
Text('1'),
Text('1'),
Text('1'),
Text('1'),
],
onSelectedItemChanged: (int i) { },
),
),
),
),
);
final DecoratedBox decoratedBox = tester.firstWidget(find.byType(DecoratedBox));
final BoxDecoration boxDecoration = decoratedBox.decoration as BoxDecoration;
expect(boxDecoration.gradient, isNull);
expect(boxDecoration.color, isNotNull);
});
expect(find.byType(CupertinoPicker), paints..path(color: const Color(0x33000000), style: PaintingStyle.stroke));
expect(find.byType(CupertinoPicker), paints..rect(color: const Color(0xFF123456)));
testWidgets('gradient displays correctly with null background color', (WidgetTester tester) async {
await tester.pumpWidget(
Directionality(
textDirection: TextDirection.ltr,
child: Align(
alignment: Alignment.topLeft,
child: SizedBox(
height: 300.0,
width: 300.0,
child: CupertinoPicker(
backgroundColor: null,
itemExtent: 15.0,
children: const <Widget>[
Text('1'),
Text('1'),
Text('1'),
Text('1'),
Text('1'),
Text('1'),
Text('1'),
],
onSelectedItemChanged: (int i) { },
await tester.pumpWidget(
CupertinoApp(
theme: const CupertinoThemeData(brightness: Brightness.dark),
home: Align(
alignment: Alignment.topLeft,
child: SizedBox(
height: 300.0,
width: 300.0,
child: CupertinoPicker(
backgroundColor: const CupertinoDynamicColor.withBrightness(
color: Color(0xFF123456),
darkColor: Color(0xFF654321),
),
itemExtent: 15.0,
children: const <Widget>[Text('1'), Text('1')],
onSelectedItemChanged: (int i) { },
),
),
),
);
// If the background color is null, the gradient color should be white.
const Color backgroundColor = Color(0xFFFFFFFF);
final Container container = tester.firstWidget(find.byType(Container));
final BoxDecoration boxDecoration = container.decoration as BoxDecoration;
expect(boxDecoration.gradient.colors, <Color>[
backgroundColor,
backgroundColor.withAlpha(0xF2),
backgroundColor.withAlpha(0xDD),
backgroundColor.withAlpha(0x00),
backgroundColor.withAlpha(0x00),
backgroundColor.withAlpha(0xDD),
backgroundColor.withAlpha(0xF2),
backgroundColor,
]);
});
),
);
expect(find.byType(CupertinoPicker), paints..path(color: const Color(0x33FFFFFF), style: PaintingStyle.stroke));
expect(find.byType(CupertinoPicker), paints..rect(color: const Color(0xFF654321)));
});
group('scroll', () {

57
packages/flutter/test/widgets/list_wheel_scroll_view_test.dart
View File

@ -64,6 +64,63 @@ void main() {
throwsAssertionError,
);
});
testWidgets('ListWheelScrollView needs valid overAndUnderCenterOpacity', (WidgetTester tester) async {
expect(
() {
ListWheelScrollView(
overAndUnderCenterOpacity: null,
itemExtent: 20.0,
children: <Widget>[Container()],
);
},
throwsAssertionError,
);
expect(
() {
ListWheelScrollView(
overAndUnderCenterOpacity: -1,
itemExtent: 20.0,
children: <Widget>[Container()],
);
},
throwsAssertionError,
);
expect(
() {
ListWheelScrollView(
overAndUnderCenterOpacity: 2,
itemExtent: 20.0,
children: <Widget>[Container()],
);
},
throwsAssertionError,
);
expect(
() {
ListWheelScrollView(
overAndUnderCenterOpacity: 1,
itemExtent: 20.0,
children: <Widget>[Container()],
);
},
isNot(throwsAssertionError),
);
expect(
() {
ListWheelScrollView(
overAndUnderCenterOpacity: 0,
itemExtent: 20.0,
children: <Widget>[Container()],
);
},
isNot(throwsAssertionError),
);
});
});
group('infinite scrolling', () {