How can I do this binding in ListView / ListViewITem?

Question

I have the following in my WPF ListView... my ListView is using objects of type

NameDescLVItem (my own class)...

 

GridViewColumn

   GridViewColumn.CellTemplate

        DataTemplate

            Rectangle

            <some other stuff at the same level>

 

Now I want to bind Rectangle.Visibility... to do so I need ListViewItem.IsKeyboardFocused || (ListViewItem.Selected && "IsItemBeingEdited")

Now, I'm not sure how to do this because the expression is more complicated then a single property... I thought about adding a new property to the NameDescLVItem class and binding to that, but it doesn't seem possible to bind to properties on NameDescLVItem... I tried doing this:

 

Visibility

 

 

="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type local:NameDescLVItem}}, Path=IsKeyboardFocused, Converter={StaticResource SelectedItemToVisibilityConverter}}">

But at runtime, I get an exception saying it can't find an ancestor of that type.

Can't really derive a class from ListView and add the property there because then I don't know what item WPF data binding is asking about.

Any ideas?

Answer 1

Sounds like you might need to combine some DataTriggers with MultiBindings, but it's hard to say without the rest of the XAML.

 

http://msdn.microsoft.com/en-us/library/system.windows.data.multibinding.aspx

http://msdn.microsoft.com/en-us/library/system.windows.datatrigger.aspx

 

A quick way of Binding to a control, instead of using RelativeSource, is just to give the control an x:Name property, and your binding could go...

 

{Binding ElementName="listview", Path=SelectedItem} (or whatever property of the ListView you want to bind to)

 

Hope that helps,

Matt

Answer 2

Well, yeah, thats the thing... I can't bind to SelectedItem because thats not the item I'm interested in. Lets say I have 10 items, 0 through 9. The WPF runtime is asking about items 0 through 9, not the selected item.

Your multibinding suggestion may do the trick though, cuz then I can bind to multiple unrelated things.

I'll give that a whirl tommorow.

I think if I bind to ListViewItem.IsKeyboardFocused, ListViewItem.IsSelected and ListView.IsKeyboardFocusedWithin and then run it through a multi converter I'll be able to get it working...

Thanks for the suggestion.