private void OnSquarePointerPressed(object sender, PointerRoutedEventArgs e)
{
if (!HasDragAndDrop)
{
return;
}
dragStartPoint = e.GetCurrentPoint(board).Position;
pointerPressSquare = (SquareView)sender;
}
private void MoveDropHintEllipseToSquare(SquareView square)
{
if (dropHintEllipse == null)
{
throw new InvalidOperationException("The drop hint ellipse should not be null.");
}
SquareViewModel squareVM = (SquareViewModel)square.DataContext;
Point squareMiddlePoint = GetSquareMiddlePoint(squareVM.Coordinate);
Canvas.SetTop(dropHintEllipse, squareMiddlePoint.Y - dropHintEllipse.Height / 2);
Canvas.SetLeft(dropHintEllipse, squareMiddlePoint.X - dropHintEllipse.Width / 2);
}
private void EndDragMove()
{
if (!isDragStarted)
{
return;
}
dragCanvas.Children.Clear();
isDragStarted = false;
dragSourcePieceViewModel.IsDragSource = false;
dragSourcePieceViewModel = null;
pointerPressSquare = null;
dropHintEllipse = null;
}
private void OnSquarePointerReleased(object sender, PointerRoutedEventArgs e)
{
if (isDragStarted)
{
SquareView dropSquare = (SquareView)sender;
dropSquare.IsDropTarget = false;
ViewModel.OnPieceDropped((SquareViewModel)dropSquare.DataContext);
// make sure to re-layout possible changed pieces
// when a piece changes its coordinate it does not change view arrange
if (promotionTask == null)
{
piecesItemsControl.ItemsPanelRoot.InvalidateArrange();
}
}
EndDragMove();
}