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Support using diff widget for drag feedback

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This commit is contained in:
Ming Ming 2021-07-09 18:06:28 +08:00
parent da878c39fe
commit 62e72bdf81
2 changed files with 9 additions and 1 deletions
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4
lib/widget/draggable.dart
View file

@ -7,6 +7,7 @@ class Draggable<T> extends StatelessWidget {
Key key,
@required this.data,
@required this.child,
this.feedback,
this.onDropBefore,
this.onDropAfter,
this.onDragStarted,
@ -53,7 +54,7 @@ class Draggable<T> extends StatelessWidget {
height: feedbackSize?.height ?? 128,
child: Opacity(
opacity: .5,
child: child,
child: feedback ?? child,
),
),
),
@ -104,6 +105,7 @@ class Draggable<T> extends StatelessWidget {
final T data;
final Widget child;
final Widget feedback;
/// Called when some item dropped before this item
final DragTargetAccept<T> onDropBefore;

6
lib/widget/draggable_item_list_mixin.dart
View file

@ -6,6 +6,11 @@ import 'package:nc_photos/widget/measurable_item_list.dart';
abstract class DraggableItem {
Widget buildWidget(BuildContext context);
/// The widget to show under the pointer when a drag is under way.
///
/// Return null if you wish to just use the same widget as display
Widget buildDragFeedbackWidget(BuildContext context) => null;
bool get isDraggable => false;
DragTargetAccept<DraggableItem> get onDropBefore => null;
DragTargetAccept<DraggableItem> get onDropAfter => null;
@ -40,6 +45,7 @@ mixin DraggableItemListMixin<T extends StatefulWidget> on State<T> {
return _.Draggable(
data: item,
child: item.buildWidget(context),
feedback: item.buildDragFeedbackWidget(context),
onDropBefore: item.onDropBefore,
onDropAfter: item.onDropAfter,
onDragStarted: item.onDragStarted,