private double GetDeltaYCrop(Image imageOriginal)
{
ViewportControl viewportControl = null;
for (FrameworkElement frameworkElement = (FrameworkElement)imageOriginal; frameworkElement != null; frameworkElement = VisualTreeHelper.GetParent((DependencyObject)frameworkElement) as FrameworkElement)
{
if (frameworkElement is ViewportControl)
{
viewportControl = frameworkElement as ViewportControl;
break;
}
}
double num1 = 0.0;
if (viewportControl != null)
{
Rect rect = ((UIElement)imageOriginal).TransformToVisual((UIElement)viewportControl).TransformBounds(new Rect(0.0, 0.0, ((FrameworkElement)imageOriginal).ActualWidth, ((FrameworkElement)imageOriginal).ActualHeight));
// ISSUE: explicit reference operation
double num2 = rect.Top - AttachedProperties.GetExtraDeltaYCropWhenHidingImage((DependencyObject)viewportControl);
if (num2 < 0.0)
{
num1 = -num2;
}
}
return(num1);
}