Enum Editor (what did i just do??)

Grids for WPF Forum

Posted 8 years ago by jeff jarrell
Version: 11.1.0543
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I wanted to derive the enumEditBox for use in the propertyGrid. I added a couple shortcut keys and a .GotFocus and an ErrorTemplate. Now selection doesn't work with the mouse, short-cuts are nice though. still works if i type. I did put a hack in to keep it working in the meantime (see previewMousedown).

If I change the PropGrid:EnumEditorEx to the normal actipro:EnumEditBox (and change the style reference it all works just fine)

XML Declarations


<Style x:Key="enumEditorStyle" TargetType="{x:Type PropGrid:EnumEditorEx}"
            BasedOn="{StaticResource {x:Type actEditors:EnumEditBox}}">
    </Style>
    
    <DataTemplate x:Key="enumEditor">
        <PropGrid:EnumEditorEx
            Style="{StaticResource enumEditorStyle}"
            BorderThickness="0"
            Margin="5,0,0,0"
            VerticalAlignment="Center"
            g:InputExtender.OnEnterPressed="PropGrid:EnumEditorEx.Value"   
            Validation.ErrorTemplate="{DynamicResource {x:Static gr:ControlTemplates.RichToolTipValidationKey}}" 
            Value="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type actPrimitives:PropertyGridDataAccessorItem}}, Path=Value,
            UpdateSourceTrigger=PropertyChanged, ValidatesOnExceptions=True, ValidatesOnDataErrors=True}"
            IsEnabled="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type actPrimitives:PropertyGridDataAccessorItem}}, Path=IsReadOnly, Converter={StaticResource booleanNotConverter}}"
            />
    </DataTemplate>

Code of derived control

    public class EnumEditorEx : EnumEditBox
    {
        public EnumEditorEx()
        {
            PreviewKeyDown += new KeyEventHandler(EnumEditorEx_PreviewKeyDown);
            GotFocus += new RoutedEventHandler(EnumEditorEx_GotFocus);
            PreviewMouseDown += new MouseButtonEventHandler(EnumEditorEx_PreviewMouseDown);
        }

        void EnumEditorEx_PreviewMouseDown(object sender, MouseButtonEventArgs e)
        {
            Debug.WriteLine("enumEdit:" + e.OriginalSource.GetType().Name);
            EnumListBoxItem item = VisualTreeHelperHelper.FindVisualParentIncludingSelf<EnumListBoxItem>(e.OriginalSource);
            if (item != null)
            {
                Value = (Enum)item.DataContext;
                e.Handled = true;
            }
        }

        void EnumEditorEx_GotFocus(object sender, System.Windows.RoutedEventArgs e)
        {
            SelectFirstGroup();
        }

        void EnumEditorEx_PreviewKeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Add)
            {
                changeIndex(1);
                e.Handled = true;
            }
            if (e.Key == Key.Subtract)
            {
                changeIndex(-1);
                e.Handled = true;
            }
        }

        void changeIndex(int factor)
        {
            List<String> list = new List<String>(Enum.GetNames(Value.GetType()));
            for (int i = 0; i < list.Count; i++)
            {
                if (list[i] == Value.ToString())
                {
                    i += factor;
                    if (i > (list.Count - 1))
                        i = 0;

                    if (i < 0)
                        i = list.Count - 1;

                    Value = (Enum)Enum.Parse(Value.GetType(), list[i]);
                    SelectFirstGroup();
                    break;
                }
            }

        }
    }

Comments (1)

Posted 8 years ago by Actipro Software Support - Cleveland, OH, USA
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Hi Jeff,

The issue is your GotFocus event handler. That event is fired even for the drop-down content, as it's a bubbling event. So in effect, you are moving the focus back to the edit box when you try to click in the drop-down content.

You may need to ignore the even when the original source is an EnumListBoxItem.


Actipro Software Support

The latest build of this product (v2019.1 build 0681) was released 13 days ago, which was after the last post in this thread.

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