/// <summary>
/// Update the rectangular bound of the element
/// This method is called from the application context.
/// </summary>
internal void UpdateRect()
{
// The RenderSize is only valid if IsArrangeValid is true.
if (_element.IsArrangeValid && _element.IsEnabled && _element.IsVisible && _element.IsHitTestVisible)
{
_rc = new Rect(new Point(), _element.RenderSize);// _element.GetContentBoundingBox();
Visual root = VisualTreeHelper.GetContainingVisual2D(InputElement.GetRootVisual(_element));
try
{
_viewToElement = root.TransformToDescendant(_element);
}
catch (System.InvalidOperationException)
{
// This gets hit if the transform is not invertable. In that case
// we will just not allow this plugin to be hit.
_rc = new Rect(); // empty rect so we don't hittest it.
_viewToElement = Transform.Identity;
}
}
else
{
_rc = new Rect(); // empty rect so we don't hittest it.
}
if (_viewToElement == null)
{
_viewToElement = Transform.Identity;
}
}
/// <param name="o">The dependency object to find the source for</param>
/// <param name="enable2DTo3DTransition">
/// Determines whether when walking the tree to enable transitioning from a 2D child
/// to a 3D parent or to stop once a 3D parent is encountered.
/// </param>
private static PresentationSource FindSource(DependencyObject o, bool enable2DTo3DTransition)
{
PresentationSource source = null;
// For "Visual" nodes GetRootVisual() climbs to the top of the
// visual tree (parent==null)
// For "ContentElements" it climbs the logical parent until it
// reaches a visual then climbs to the top of the visual tree.
DependencyObject v = InputElement.GetRootVisual(o, enable2DTo3DTransition);
if (v != null)
{
source = CriticalGetPresentationSourceFromElement(v, RootSourceProperty);
}
return(source);
}