how to get wpf button screen rectangle.

Question

Hi I am trying to get the screen rectangle of a wpf button so that i can highlight it.

I use this to achieve the same:

AutomationPeer theBtnPeer = createPeerForElement(btn); Rect rect = theBtnPeer.GetBoundingScreenRectangle();

This works fine and give me the right rectangle.

However.. if the button is not currently visible then I invoke the BringIntoView() on this btn which successfully brings this button into view however when I call the GetBoundingSCreenRectangle() on it again . it gives me the same old value that was there before I invoked BringIntoView().

How do I get the new bounding rectangle of this button?

Thanks

Answer 1

You can get the height and width of the rectangle through the ActualHeight and ActualWidth properties.

The coordinates in the window will depend on the type of the layout control that the button is in.

If your goal is to hightlight, I suggest another route: change the template of the button to include a highlight rectangle, invisible by default, with a trigger to make it visible if some condition is met.

Or using Visual States, have highlighted and not-highlighted states, with a transition that makes the highlight rectangle visible.