Hiding Empty Group Headers in CollectionView for .NET MAUI
Environment
| Version | Product | Author |
|---|---|---|
| 10.1.0 | Telerik UI for .NET MAUI CollectionView | Dobrinka Yordanova |
Description
In scenarios where the CollectionView in .NET MAUI utilizes grouping, there might be groups with an empty string or null as their key. The goal is to completely hide such group headers so that they do not take up any vertical space in the UI.
This knowledge base article also answers the following questions:
- How do I hide group headers with no content in CollectionView for .NET MAUI?
- Can I remove the space occupied by empty group headers in CollectionView?
- What is the way to conditionally display group headers based on their content in .NET MAUI CollectionView?
Solution
To hide group headers in CollectionView for .NET MAUI when the group key is either an empty string or null and ensure they do not occupy space, use a combination of the IsVisible and MinimumHeightRequest properties within a DataTrigger. Apply these properties in the Style targeted at RadCollectionViewGroupView. Setting MinimumHeightRequest to 0 alongside making the group header invisible allows for the removal of the unwanted space that would otherwise be occupied by the header.
Here is how you can define the Style in your ContentPage.Resources:
<ContentPage.Resources>
<ResourceDictionary>
<Style TargetType="telerik:RadCollectionViewGroupView" x:Key="CollectionViewGroupStyle">
<Style.Triggers>
<DataTrigger TargetType="telerik:RadCollectionViewGroupView" Binding="{Binding Key}" Value="">
<Setter Property="IsVisible" Value="False" />
<Setter Property="MinimumHeightRequest" Value="0" />
</DataTrigger>
</Style.Triggers>
</Style>
</ResourceDictionary>
</ContentPage.Resources>
By implementing this solution, group headers with empty or null keys will be effectively hidden, and the vertical space they would typically occupy will be eliminated, resulting in a cleaner and more efficient UI presentation.