Use GroupSizeReductionOrder in RibbonControlsLibrary with MVVM - wpf

Question

I am using the RibbonControlsLibrary (.Net 4.0) for my ribbons. My implementation is completely realized using MVVM.
Now I like to use the benefit of the resizing feature. But I can't set the reduction order of the group boxes. This is because I have to define the names of the group boxes in a special order. I can't set the names of the group boxes, because I am using data templates.
I tried to bind the name of the ribbon group box user controls to a property on the datacontext, but as I supposed this doesn't work.
So, do I have any chance to set the ribbon group box user control names to a property of the data context?

Answer 1

Setting the RibbonGroups' names
There may be others solutions, mine is to implement a Behavior that sets the RibbonGroup's name in the OnAttached method.
public class RibbonGroupNameBehavior : Behavior<RibbonGroup>
{
protected override void OnAttached()
{
base.OnAttached();
GroupeCommandesViewModel groupeCommandesViewModel = this.AssociatedObject.DataContext as GroupeCommandesViewModel;
if (groupeCommandesViewModel != null)
{
this.AssociatedObject.Name = groupeCommandesViewModel.Nom;
}
}
}
You may want to add a try-catch block around the assignment...
Using the behavior
As you are using DataTemplates, I think you'll have to assign the behavior to the RibbonGroups with a Style.
I have been using this solution with success.
As you'll see, my behavior's code does not provide the required dependency property, you'll have to add it.
Here is my shortened Ribbon's style :
<r:Ribbon.Style>
<Style TargetType="{x:Type r:Ribbon}">
<Setter Property="ItemContainerStyle">
<Setter.Value>
<Style TargetType="{x:Type r:RibbonTab}">
<Setter Property="ItemsSource" Value="{Binding ListeCommandes, Converter={StaticResource CommandesToGroupesConverter}}" />
<Setter Property="GroupSizeReductionOrder" Value="{Binding ListeCommandesOrdreRedimensionnement}" />
<Setter Property="ItemContainerStyleSelector">
<Setter.Value>
<ribbonVM:RibbonGroupStyleSelector>
<ribbonVM:RibbonGroupStyleSelector.GenericStyle>
<Style TargetType="{x:Type r:RibbonGroup}" BasedOn="{StaticResource RibbonGroupStyle}" />
</ribbonVM:RibbonGroupStyleSelector.GenericStyle>
</ribbonVM:RibbonGroupStyleSelector>
</Setter.Value>
</Setter>
</Style>
</Setter.Value>
</Setter>
</Style>
</r:Ribbon.Style>
And my RibbonGroup's style :
<Style x:Key="RibbonGroupStyle" TargetType="{x:Type r:RibbonGroup}" BasedOn="{StaticResource RibbonControlStyle}">
<Setter Property="Header" Value="{Binding Libellé}" />
<Setter Property="ItemsSource" Value="{Binding Commandes}" />
<Setter Property="CanAddToQuickAccessToolBarDirectly" Value="False" />
<Setter Property="ihm_behaviors:RibbonGroupNameBehavior.IsEnabled" Value="True" />
</Style>
Databinding the GroupSizeReductionOrder property
If you look at the definition of the GroupSizeReductionOrder property, you'll see it's a StringCollection with a TypeConverter StringCollectionConverter.
From what I have seen, this converter only converts from string to StringCollection.
So your property shoud be either a string or a StringCollection.