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Demonstrate drag and drop with data #89

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Demonstrate drag and drop with data #89

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25 changes: 14 additions & 11 deletions example/lib/drag_and_drop_example.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -11,17 +11,18 @@ const cellSize = 32.0;
const columnCount = 16;
const rowCount = 16;

class ProfileData {
ProfileData({required this.userName});
final String userName;
}

class DragAndDropExample extends StatefulWidget {
@override
_DragAndDropExampleState createState() => _DragAndDropExampleState();
}

class _DragAndDropExampleState extends State<DragAndDropExample> {
/// The [Draggable] and [DragTarget] need to be associated with some type of
/// data (through their type argument, and `void` doesn't cut it). We keep it
/// simple and use a key, since we don't actually need to communicate anything
/// about the dragged data.
Key draggableKey = UniqueKey();
ProfileData profileData = ProfileData(userName: "shyndman");

/// Current position of the [DraggableGridItem].
GridPosition draggablePosition = GridPosition(0, 0);
Expand Down Expand Up @@ -51,7 +52,7 @@ class _DragAndDropExampleState extends State<DragAndDropExample> {
// And a single Draggable, positioned according to the
// `draggablePosition` field.
DraggableGridItem(
key: draggableKey,
data: profileData,
).withGridPlacement(
columnStart: draggablePosition.x,
rowStart: draggablePosition.y,
Expand All @@ -64,8 +65,10 @@ class _DragAndDropExampleState extends State<DragAndDropExample> {
/// A square that can be dragged between grid cells.
class DraggableGridItem extends StatelessWidget {
const DraggableGridItem({
required Key key,
}) : super(key: key);
required this.data,
});

final ProfileData data;

@override
Widget build(BuildContext context) {
Expand All @@ -80,8 +83,8 @@ class DraggableGridItem extends StatelessWidget {
),
);

return Draggable<Key>(
data: key,
return Draggable<ProfileData>(
data: data,
feedback: Opacity(
opacity: 0.6,
child: Transform.scale(
Expand Down Expand Up @@ -127,7 +130,7 @@ class _CellState extends State<Cell> {

@override
Widget build(BuildContext context) {
return DragTarget<Key>(
return DragTarget<ProfileData>(
onAccept: (_) {
setState(() => isDragHovering = false);
widget.cellBecameOccupied(GridPosition(widget.column, widget.row));
Expand Down