void CollectionViewCurrentChanged(object sender, EventArgs e)
{
CollectionView collectionView = (CollectionView)sender;
if (collectionView != null && collectionView.CurrentPosition >= 0 && collectionView.CurrentPosition <= piePieces.Count)
{
PiePiece piece = piePieces[collectionView.CurrentPosition];
DoubleAnimation a = new DoubleAnimation();
a.To = 10;
a.Duration = new Duration(TimeSpan.FromMilliseconds(200));
piece.BeginAnimation(PiePiece.PushOutProperty, a);
}
}
void PiePieceMouseUp(object sender, MouseButtonEventArgs e)
{
CollectionView collectionView = (CollectionView)CollectionViewSource.GetDefaultView(this.DataContext);
if (collectionView == null)
{
return;
}
PiePiece piece = sender as PiePiece;
if (piece == null)
{
return;
}
// select the item which this pie piece represents
int index = (int)piece.Tag;
collectionView.MoveCurrentToPosition(index);
}