Keep popup within window bounds

Question

I\'m trying to display a popup under a button.

This is what it looks like now :

Answer 1

I fixed it by setting the placement the custom:

<views:OptionPopup x:Name="OptionsMenuPopup"
     PlacementTarget="{Binding ElementName=AdminPanel}"
     Placement="Custom"
     MinWidth="{Binding ActualWidth, ElementName=AdminPanel}"
     MaxWidth="{Binding ActualWidth, ElementName=AdminContainer}" /> 

And in the constructor of my usercontrol in code behind I added

OptionsMenuPopup.CustomPopupPlacementCallback += (Size popupSize, Size targetSize, Point offset) =>
            new[] { new CustomPopupPlacement() { Point = new Point(targetSize.Width - popupSize.Width, targetSize.Height) } }; 

Answer 2

You could use a combination of SystemParameters.PrimaryScreenHeight and the top-left point of the Popup to calculate how much room you have, and set that as the MaxHeight and MaxWidth of the Popup's contents.