LookupEdit Popup Height Too High

Hello all,

I also encountered this problem and wanted to share a more convenient solution for this problem, one that uses Attached Behaviors.

Add this class to your project:

C#
public static class LookUpEditPopupSizeBehavior  
    {  
        public static DependencyProperty AllowAutoPopupSizeProperty;  

        /// <summary>  
        /// Initializes the <see ref="LookUpEditPopupSizeBehavior" /> class.  
        /// </summary>  
        static LookUpEditPopupSizeBehavior()  
        {  
            AllowAutoPopupSizeProperty = DependencyProperty.RegisterAttached("AllowAutoPopupSize", typeof(bool), typeof(LookUpEditPopupSizeBehavior), new FrameworkPropertyMetadata(OnAllowAutoPopupSize));  
        }  

        public static void SetAllowAutoPopupSize(LookUpEditBase editor, bool value)  
        {  
            editor.SetValue(AllowAutoPopupSizeProperty, value);  
        }  

        public static bool GetAllowAutoPopupSize(LookUpEditBase editor)  
        {  
            return (bool)editor.GetValue(AllowAutoPopupSizeProperty);  
        }  

        private static void OnAllowAutoPopupSize(DependencyObject d, DependencyPropertyChangedEventArgs e)  
        {  
            LookUpEditBase editor = d as LookUpEditBase;  
            bool oldValue = (bool)e.OldValue;  
            bool newValue = (bool)e.NewValue;  

            if (oldValue)  
            {  
                editor.PopupOpened -= AdjustPopupSize;  
            }  

            if (newValue)  
            {  
                editor.PopupOpened += AdjustPopupSize;  
            }  

        }  

        private static void AdjustPopupSize(object sender, RoutedEventArgs e)  
        {  
            LookUpEditBase editor = sender as LookUpEditBase;  

            FrameworkElement control = LookUpEditHelper.GetVisualClient(editor).InnerEditor;  

            double height = Math.Min (control.DesiredSize.Height + 3, 300);  
            editor.PopupMinHeight = height;  
            editor.PopupHeight = height;  
        }  
    }  

To use, simple write (in a style in my case):

XAML
<Setter Property="myNS:LookUpEditPopupSizeBehavior.AllowAutoPopupSize" Value="True" />  

Hope you find this useful.

Regards,
Shahaf.

P.S.

The above solution has a bug where the height of the popup is not correctly set when changing the LookUpEdit ItemsSource property. For a fix see this post: http://www.devexpress.com/Support/Center/p/Q445787.aspx

Hi Mark,
Thank you for your inquiry. This behavior is caused by the fact that we do not resize the LookUpEdit's popup automatically based on the popup's content. To achieve this goal, I suggest you set the PopupMinHeight property based on popup content's height. You can do this in the PopupOpened event handler.
If you have additional questions, feel free to reactivate this thread.
Thanks