WPF Popup - when to disable, how to keep in relative position to origin control? ;)

Question

2 simpl questions.

Given a WPF popup...

• What is a good way to hide it again when it is used like a submenu? WHich event is proper?

• WHat is the way to keep it's position stable relative to the origin control?

THanks in advance ;)

Answer 1

1. The Popup.Opened and Popup.Closed events are fired when the popup is shown and hidden.
2. I would set the Popup.PlacementRectangle based on the Control origin, which can be obtained using the Control.PointToScreen method like so:

Point location = originControl.PointToScreen(new Point(0, 0));

You will need to listen to the UIElement.LayoutUpdated event (and probably some other events, too) to determine when the control position has changed.