protected override void OnPreviewMouseLeftButtonDown(MouseButtonEventArgs e)
{
base.OnPreviewMouseLeftButtonDown(e);
if (e.OriginalSource.GetType() == typeof(RouteItem))
{
Point position = e.GetPosition(this);
// To prevent Mouse "hang" error, release Adorner object if one constructed
if (_adorner != null)
{
AdornerLayer.GetAdornerLayer(_adorner.AdornedElement).Remove(_adorner);
}
// Initialize new Adorner object
_adorner = new AdornerDrawing(e.OriginalSource as UIElement)
{
StartPoint = position
};
e.Handled = true;
}
}
private void DragFinished(bool cancel)
{
//Release Mouse
Mouse.Capture(null);
// Remove adorner object from rendering layer
AdornerLayer.GetAdornerLayer(_adorner.AdornedElement).Remove(_adorner);
if (_adorner.IsDragStarted && cancel == false)
{
//Move object to new position
if (_adorner.OriginalSource is RouteItem rt)
{
rt.SetBindingPoint(new Point(
_adorner.StartPoint.X + _adorner.LeftOffset - _adorner.ActualWidth / 2,
_adorner.StartPoint.Y + _adorner.TopOffset - _adorner.ActualHeight / 2));
}
_adorner = null;
InvalidateVisual();
}
}