private static void Element_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
if (_adorner is null)
{
return;
}
_adorner.AdornedElement.ReleaseMouseCapture();
_adorner.Detach();
_adorner = null;
}
private static void Element_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
if (sender is not FrameworkElement adornedElement)
{
return;
}
var parent = e.OriginalSource is FrameworkElement originalElement
? FindAncestor <Panel>(originalElement) : null;
if (parent is null)
{
return;
}
var pt = e.GetPosition(adornedElement);
var offset = new Point(-pt.X, -pt.Y);
_adorner = new GhostAdorner(parent, adornedElement, pt, offset);
adornedElement.CaptureMouse();
}