handleDrop method
Handles the drop event.
Implementation
void handleDrop(DragSession session) {
final dragTarget = widget as DragTarget<T>;
final data = session.data;
if (data is T) {
final castedData = data as T;
if (dragTarget.onAccept != null) {
dragTarget.onAccept!(castedData);
}
}
_candidateData.clear();
_rejectedData.clear();
markNeedsBuild();
}