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Draggable can be accepted when the data is null (#97355)

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xubaolin 2022-02-24 07:19:22 +08:00 committed by GitHub
parent 9e7cc970ea
commit 2ad0ac0ef2
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4 changed files with 130 additions and 37 deletions
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6
dev/manual_tests/lib/drag_and_drop.dart
View file

@ -16,9 +16,9 @@ class ExampleDragTarget extends StatefulWidget {
class ExampleDragTargetState extends State<ExampleDragTarget> {
Color _color = Colors.grey;
void _handleAccept(Color data) {
void _handleAccept(Color? data) {
setState(() {
_color = data;
_color = data!;
});
}
@ -215,7 +215,7 @@ class MovableBall extends StatelessWidget {
);
} else {
return DragTarget<bool>(
onAccept: (bool data) { callback(position); },
onAccept: (bool? data) { callback(position); },
builder: (BuildContext context, List<bool?> accepted, List<dynamic> rejected) {
return dashedBall;
},

4
examples/api/lib/widgets/drag_target/draggable.0.dart
View file

@ -81,9 +81,9 @@ class _MyStatefulWidgetState extends State<MyStatefulWidget> {
),
);
},
onAccept: (int data) {
onAccept: (int? data) {
setState(() {
acceptedData += data;
acceptedData += data!;
});
},
),

10
packages/flutter/lib/src/widgets/drag_target.dart
View file

@ -20,7 +20,7 @@ typedef DragTargetWillAccept<T> = bool Function(T? data);
/// Signature for causing a [DragTarget] to accept the given data.
///
/// Used by [DragTarget.onAccept].
typedef DragTargetAccept<T> = void Function(T data);
typedef DragTargetAccept<T> = void Function(T? data);
/// Signature for determining information about the acceptance by a [DragTarget].
///
@ -638,7 +638,7 @@ class DragTargetDetails<T> {
DragTargetDetails({required this.data, required this.offset}) : assert(offset != null);
/// The data that was dropped onto this [DragTarget].
final T data;
final T? data;
/// The global position when the specific pointer event occurred on
/// the draggable.
@ -767,14 +767,14 @@ class _DragTargetState<T extends Object> extends State<DragTarget<T>> {
setState(() {
_candidateAvatars.remove(avatar);
});
widget.onAccept?.call(avatar.data! as T);
widget.onAcceptWithDetails?.call(DragTargetDetails<T>(data: avatar.data! as T, offset: avatar._lastOffset!));
widget.onAccept?.call(avatar.data as T?);
widget.onAcceptWithDetails?.call(DragTargetDetails<T>(data: avatar.data as T?, offset: avatar._lastOffset!));
}
void didMove(_DragAvatar<Object> avatar) {
if (!mounted)
return;
widget.onMove?.call(DragTargetDetails<T>(data: avatar.data! as T, offset: avatar._lastOffset!));
widget.onMove?.call(DragTargetDetails<T>(data: avatar.data as T?, offset: avatar._lastOffset!));
}
@override

147
packages/flutter/test/widgets/draggable_test.dart
View file

@ -39,7 +39,9 @@ void main() {
return const SizedBox(height: 100.0, child: Text('Target'));
},
onMove: (_) => moveCount++,
onAccept: accepted.add,
onAccept: (int? data) {
accepted.add(data!);
},
onAcceptWithDetails: acceptedDetails.add,
),
],
@ -91,9 +93,60 @@ void main() {
expect(moveCount, 1);
});
testWidgets('Draggable can be accepted when the data is null', (WidgetTester tester) async {
// Regression test for https://github.com/flutter/flutter/issues/84816
final Map<String, int?> receivedData = <String, int?>{};
await tester.pumpWidget(MaterialApp(
home: Column(
children: <Widget>[
const Draggable<int>(
feedback: Text('Dragging'),
child: Text('Source'),
),
DragTarget<int>(
builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
return const SizedBox(height: 100.0, child: Text('Target 1'));
},
onWillAccept: (int? data) {
receivedData['onWillAccept'] = data;
return true;
},
onAccept: (int? data) {
receivedData['onAccept'] = data;
},
onAcceptWithDetails: (DragTargetDetails<int> details) {
receivedData['onAcceptWithDetails'] = details.data;
},
onMove: (DragTargetDetails<int> details) {
receivedData['onMove'] = details.data;
},
),
],
),
));
final Offset firstLocation = tester.getCenter(find.text('Source'));
final TestGesture gesture = await tester.startGesture(firstLocation, pointer: 7);
await tester.pump();
final Offset secondLocation = tester.getCenter(find.text('Target 1'));
await gesture.moveTo(secondLocation);
await tester.pump();
await gesture.up();
await tester.pump();
expect(receivedData.length, 4);
expect(receivedData['onWillAccept'], null);
expect(receivedData['onMove'], null);
expect(receivedData['onAccept'], null);
expect(receivedData['onAcceptWithDetails'], null);
});
// Regression test for https://github.com/flutter/flutter/issues/76825
testWidgets('Drag and drop - onLeave callback fires correctly with generic parameter', (WidgetTester tester) async {
final Map<String,int> leftBehind = <String,int>{
final Map<String, int> leftBehind = <String, int>{
'Target 1': 0,
'Target 2': 0,
};
@ -168,7 +221,7 @@ void main() {
});
testWidgets('Drag and drop - onLeave callback fires correctly', (WidgetTester tester) async {
final Map<String,int> leftBehind = <String,int>{
final Map<String, int> leftBehind = <String, int>{
'Target 1': 0,
'Target 2': 0,
};
@ -244,7 +297,7 @@ void main() {
// Regression test for https://github.com/flutter/flutter/issues/76825
testWidgets('Drag and drop - onMove callback fires correctly with generic parameter', (WidgetTester tester) async {
final Map<String,int> targetMoveCount = <String,int>{
final Map<String, int> targetMoveCount = <String, int>{
'Target 1': 0,
'Target 2': 0,
};
@ -263,7 +316,7 @@ void main() {
},
onMove: (DragTargetDetails<int> details) {
targetMoveCount['Target 1'] =
targetMoveCount['Target 1']! + details.data;
targetMoveCount['Target 1']! + details.data!;
},
),
DragTarget<int>(
@ -272,7 +325,7 @@ void main() {
},
onMove: (DragTargetDetails<int> details) {
targetMoveCount['Target 2'] =
targetMoveCount['Target 2']! + details.data;
targetMoveCount['Target 2']! + details.data!;
},
),
],
@ -317,7 +370,7 @@ void main() {
});
testWidgets('Drag and drop - onMove callback fires correctly', (WidgetTester tester) async {
final Map<String,int> targetMoveCount = <String,int>{
final Map<String, int> targetMoveCount = <String, int>{
'Target 1': 0,
'Target 2': 0,
};
@ -1167,7 +1220,9 @@ void main() {
builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
return const SizedBox(height: 100.0, child: Text('Target'));
},
onAccept: accepted.add,
onAccept: (int? data) {
accepted.add(data!);
},
onAcceptWithDetails: acceptedDetails.add,
),
],
@ -1243,7 +1298,9 @@ void main() {
);
},
onWillAccept: (int? data) => false,
onAccept: accepted.add,
onAccept: (int? data) {
accepted.add(data!);
},
onAcceptWithDetails: acceptedDetails.add,
),
],
@ -1316,7 +1373,9 @@ void main() {
return const SizedBox(height: 100.0, child: Text('Target'));
},
onWillAccept: (int? data) => false,
onAccept: accepted.add,
onAccept: (int? data) {
accepted.add(data!);
},
onAcceptWithDetails: acceptedDetails.add,
),
]),
@ -1366,7 +1425,9 @@ void main() {
return const SizedBox(height: 100.0, child: Text('Target'));
},
onWillAccept: (int? data) => false,
onAccept: accepted.add,
onAccept: (int? data) {
accepted.add(data!);
},
onAcceptWithDetails: acceptedDetails.add,
),
],
@ -1580,7 +1641,9 @@ void main() {
);
},
onWillAccept: (int? data) => false,
onAccept: accepted.add,
onAccept: (int? data) {
accepted.add(data!);
},
onAcceptWithDetails: acceptedDetails.add,
),
],
@ -1648,7 +1711,9 @@ void main() {
builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
return const SizedBox(height: 100.0, child: Text('Target'));
},
onAccept: accepted.add,
onAccept: (int? data) {
accepted.add(data!);
},
onAcceptWithDetails: acceptedDetails.add,
),
],
@ -1789,7 +1854,9 @@ void main() {
builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
return const SizedBox(height: 100.0, child: Text('Target'));
},
onAccept: accepted.add,
onAccept: (int? data) {
accepted.add(data!);
},
onAcceptWithDetails: acceptedDetails.add,
),
],
@ -1867,7 +1934,9 @@ void main() {
),
);
},
onAccept: acceptedInts.add,
onAccept: (int? data) {
acceptedInts.add(data!);
},
onAcceptWithDetails: acceptedIntsDetails.add,
),
DragTarget<double>(
@ -1879,7 +1948,9 @@ void main() {
),
);
},
onAccept: acceptedDoubles.add,
onAccept: (double? data) {
acceptedDoubles.add(data!);
},
onAcceptWithDetails: acceptedDoublesDetails.add,
),
],
@ -1995,7 +2066,9 @@ void main() {
child: Text('Target1'),
),
);
}, onAccept: acceptedDragTargetDatas.add,
}, onAccept: (DragTargetData? data) {
acceptedDragTargetDatas.add(data!);
},
onAcceptWithDetails: acceptedDragTargetDataDetails.add,
),
DragTarget<ExtendedDragTargetData>(
@ -2007,7 +2080,9 @@ void main() {
),
);
},
onAccept: acceptedExtendedDragTargetDatas.add,
onAccept: (ExtendedDragTargetData? data) {
acceptedExtendedDragTargetDatas.add(data!);
},
onAcceptWithDetails: acceptedExtendedDragTargetDataDetails.add,
),
],
@ -2057,7 +2132,9 @@ void main() {
builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
return const SizedBox(height: 100.0, child: Text('Target'));
},
onAccept: accepted.add,
onAccept: (int? data) {
accepted.add(data!);
},
onAcceptWithDetails: acceptedDetails.add,
),
],
@ -2316,7 +2393,9 @@ void main() {
builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
return const SizedBox(height: 100.0, child: Text('Target'));
},
onAccept: accepted.add,
onAccept: (int? data) {
accepted.add(data!);
},
onAcceptWithDetails: acceptedDetails.add,
),
],
@ -2346,7 +2425,9 @@ void main() {
builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
return const SizedBox(height: 100.0, child: Text('Target'));
},
onAccept: accepted.add,
onAccept: (int? data) {
accepted.add(data!);
},
onAcceptWithDetails: acceptedDetails.add,
),
],
@ -2426,7 +2507,9 @@ void main() {
builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
return const SizedBox(height: 100.0, child: Text('Target'));
},
onAccept: accepted.add,
onAccept: (int? data) {
accepted.add(data!);
},
onAcceptWithDetails: acceptedDetails.add,
),
],
@ -2511,7 +2594,9 @@ void main() {
builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
return const SizedBox(height: 100.0, child: Text('Target'));
},
onAccept: accepted.add,
onAccept: (int? data) {
accepted.add(data!);
},
onAcceptWithDetails: acceptedDetails.add,
),
],
@ -2765,7 +2850,9 @@ void main() {
builder: (BuildContext context, List<Object?> data, List<dynamic> rejects) {
return const SizedBox(height: 100.0, child: Text('Target'));
},
onAccept: accepted.add,
onAccept: (Object? data) {
accepted.add(data!);
},
),
],
),
@ -2801,7 +2888,9 @@ void main() {
builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
return const SizedBox(height: 100.0, child: Text('Target'));
},
onAccept: accepted.add,
onAccept: (int? data) {
accepted.add(data!);
},
),
],
),
@ -2837,7 +2926,9 @@ void main() {
builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
return const SizedBox(height: 100.0, child: Text('Target'));
},
onAccept: accepted.add,
onAccept: (int? data) {
accepted.add(data!);
},
onWillAccept: (int? data) {
if (data == null)
isReceiveNullDataForCheck = true;
@ -3180,7 +3271,9 @@ Future<void> _testChildAnchorFeedbackPosition({ required WidgetTester tester, do
builder: (BuildContext context, List<int?> data, List<dynamic> rejects) {
return const SizedBox(height: 100.0, child: Text('Target'));
},
onAccept: accepted.add,
onAccept: (int? data) {
accepted.add(data!);
},
onAcceptWithDetails: acceptedDetails.add,
),
],