public Point GetPosition(object?relativeTo)
{
CGPoint windowLocation = new CGPoint(0.0, 0.0);
if (_macOSDraggingInfo != null && _window.ContentView is { } contentView)
{
windowLocation = contentView.ConvertPointFromView(_macOSDraggingInfo.DraggingLocation, null);
}
var rawPosition = new Point(windowLocation.X, windowLocation.Y);
if (relativeTo is null)
{
return(rawPosition);
}
if (relativeTo is UIElement elt)
{
var eltToRoot = UIElement.GetTransform(elt, null);
var rootToElt = eltToRoot.Inverse();
return(rootToElt.Transform(rawPosition));
}
throw new InvalidOperationException("The relative to must be a UIElement.");
}
public ViewportInfo GetRelativeTo(IFrameworkElement_EffectiveViewport element)
{
Rect effective = Effective, clip = Clip;
if (element is UIElement uiElement && Reference is UIElement usuallyTheParentOfElement)
{
var parentToElement = UIElement.GetTransform(uiElement, usuallyTheParentOfElement).Inverse();
if (Effective.IsValid)
{
effective = parentToElement.Transform(Effective);
}
if (Clip.IsValid)
{
clip = parentToElement.Transform(Clip);
}
}
// If the Reference or the element is not a UIElement (native), we don't have any RenderTransform,
// and we assume that the 'element' is stretched in it's parent usually true except for ListView,
// but we won't even try to support that case.
return(new ViewportInfo(element, effective, clip));
}
/// <inheritdoc />
public Point GetPosition(object?relativeTo)
{
var rawWpfPosition = _wpfArgs.GetPosition(WpfHost.Current);
var rawPosition = new Point(rawWpfPosition.X, rawWpfPosition.Y);
if (relativeTo is null)
{
return(rawPosition);
}
if (relativeTo is UIElement elt)
{
var eltToRoot = UIElement.GetTransform(elt, null);
Matrix3x2.Invert(eltToRoot, out var rootToElt);
return(rootToElt.Transform(rawPosition));
}
throw new InvalidOperationException("The relative to must be a UIElement.");
}
