How to get the position of an element in a StackPanel?
Say I have a StackPanel that gets dynamically filled with copy, changing the Y position of elements inside it. I have a specific element within that StackPanel that I want to find the Y position of (relative to the StackPanel or otherwise) after the StackPanel is done repositioning all of it's children.
StackPanel sp = new StackPanel();
sp.Children.Add(someTextBlock);
sp.Children.Add(element1);
sp.Children.Add(element2);
...
someTextBlock.Text = "Lorem ipsum dolor..." // some text that pushes children of > index down
// element1 got pushed down to some unknown position based on text length
// now want to find the Y position of element1
I noticed that methods like this: http://forums.silverlight.net/forums/p/16787/55881.aspx#55881 don't work since the position returned is the position of the StackPanel and not the child element I'm targeting.
Answer
The methods in the link you posted should work fine, provided you call them correctly.
You need to call them with the correct UIElement - in this case, using element1 to the RootVisual will give you the full position of element1:
var transform = element1.TransformToVisual(Application.Current.RootVisual as FrameworkElement);
Point absolutePosition = transform.Transform(new Point(0, 0));