Issue when using templated ribbon items.

[pschimmel]

I have a problem when using DataTemplates for Ribbon Controls. I basically want to define the buttons in a ViewModel and add those programmatically to the ItemsSource of the RibbonGroupBox.

<Fluent:RibbonWindow.Resources> <ResourceDictionary> <DataTemplate DataType="{x:Type local:ButtonViewModel}"> <Fluent:Button SizeDefinition="{Binding SizeDefinition}" Header="{Binding Header}"/> </DataTemplate> </ResourceDictionary> </Fluent:RibbonWindow.Resources>
The simplified VM looks like this:

` public class ButtonViewModel
{
static int id = 0;

public ButtonViewModel()
{
  ID = "Button_" + id++;
}

public string ID { get; }

public RibbonControlSizeDefinition SizeDefinition
{
  get { return new RibbonControlSizeDefinition(RibbonControlSize.Large, RibbonControlSize.Middle, RibbonControlSize.Small); }
}

public string Header => ID;

}
`

Generally it works, but the SizeDefinition is not considered. When I reduce the size of my window, the status of each group always changes directly from Large to Collapsed.

Attached is a sample project.

WpfFluentTest.zip

---

Environment

• Fluent.Ribbon 6.1.0.233
• Windows 10
• .NET Framework 4.5

[pschimmel]

I assume the problem lies in the SetSize method in RibbonProperties. When the size of a group is changed the element is a ContentPresenter.

The code
public static void SetSize(DependencyObject element, RibbonControlSize value) { element.SetValue(SizeProperty, value); }
Tries to set the Size property of the ContentPresenter, but on the ContentPresenter itself there is no such property.

Probably my DataTemplate approach is wrong.

[batzen]

Will try to have a look at this sometime during this week. MVVM support is not as good as it probably could be.

[pschimmel]

Hi!
Thank you for adding the fix to the 7.0.0 milestone.
Unfortunately I discovered some more problems concerning the use of data templates.

When I use the same example and add a KeyTip property to the ViewModel and use data binding in the data template as before, I get an exception in RibbonGroupBoxWrapPanel.

KeyTip="{Binding KeyTip}

When I change the data template, that it uses an attached property

Fluent:KeyTip.Keys="{Binding KeyTip}"

There is no exception, but also no KeyTips shown.

I could track down that problem to the GetVisibleChildren implementation in the KeyTipAdorner. Using a VisualTreeHelper instead of the LogicalTreeHelper to find the children might work, but is probably too expensive.

[pschimmel]

Updated test project here:

WpfFluentTest.zip