How to provide resizing option for GroupBarItem content?
At present there is no default support to resize the height of the GroupBarItem content. We can customize WPF GroupBar Style, add GridSplitter control to perform resize functionality. The following code demonstrates the same.
Code Example: [Xaml]
<!-- GroupBarItem Customizing -->
<Style x:Key="{x:Type syncfusion:GroupBarItem}" TargetType="{x:Type syncfusion:GroupBarItem}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type syncfusion:GroupBarItem}">
<!--MainGrid-->
<Grid x:Name="MainGrid" ClipToBounds="True" SnapsToDevicePixels="True">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<!--StackPanel host for GroupBarItem header-->
<StackPanel Name="MainStackPanel" >
<Border x:Name="HeaderHost" BorderBrush="{TemplateBinding BorderBrush}" Background="{TemplateBinding Background}" Height="{Binding ItemHeaderHeight, RelativeSource={RelativeSource FindAncestor, AncestorLevel=1, AncestorType={x:Type
syncfusion:GroupBar}}}" >
<DockPanel>
<!-- GroupBarItem content -->
<ContentPresenter x:Name="contentText" ContentTemplate="{TemplateBinding HeaderTemplate}" Content="{TemplateBinding Header}" DockPanel.Dock="Top" Margin="5,0,0,0" VerticalAlignment="Center" TextElement.Foreground="{TemplateBinding Foreground}" TextElement.FontWeight="{TemplateBinding FontWeight}" TextElement.FontStyle="{TemplateBinding FontStyle}" TextElement.FontSize="{TemplateBinding FontSize}" TextElement.FontFamily="{TemplateBinding FontFamily}"/>
</DockPanel>
</Border>
</StackPanel>
<!--Border host for GroupBarItem content-->
<Border x:Name="ContentHostBorder" Grid.Row="1" >
<ContentPresenter x:Name="ContentHost" />
</Border>
<!-- For Adding GridSplitter -->
<GridSplitter Height="5" Background="Magenta" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Grid.Row="2" />
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<!—Code from MainWindow.xaml -->
<!--GroupBar -->
<syncfusion:GroupBar VisualMode="MultipleExpansion">
<!--GroupBarItem -->
<syncfusion:GroupBarItem HeaderText="MailBox" IsExpanded="False">
<!--GroupView -->
<syncfusion:GroupView >
<!--GroupViewItem -->
<syncfusion:GroupViewItem Text="Inbox" ImageSource="/Images/inbox.png" />
<syncfusion:GroupViewItem Text="Outbox" ImageSource="/Images/outbox.png"/>
<syncfusion:GroupViewItem Text="Sent Items" ImageSource="/Images/sent.png" />
<syncfusion:GroupViewItem Text="Mail" ImageSource="/Images/mail.png"/>
<syncfusion:GroupViewItem Text="Notes" ImageSource="/Images/Notes.png"/>
<syncfusion:GroupViewItem Text="Spam" ImageSource="/Images/spam.png"/>
<syncfusion:GroupViewItem Text="Trash" ImageSource="/Images/trash.png"/>
<syncfusion:GroupViewItem Text="Contacts" ImageSource="/Images/Contact.png"/>
<syncfusion:GroupViewItem Text="Tasks" ImageSource="/Images/Tasks.png"/>
<syncfusion:GroupViewItem Text="Folder" ImageSource="/Images/folder.gif"/>
</syncfusion:GroupView>
</syncfusion:GroupBarItem>
<!--GroupBarItem -->
<syncfusion:GroupBarItem HeaderText="Favorties">
<!--GroupView -->
<syncfusion:GroupView >
<!--GroupViewItem -->
<syncfusion:GroupViewItem Name="groupViewItem8" Text="Inbox" ImageSource="/Images/inbox.png"/>
<syncfusion:GroupViewItem Name="groupViewItem9" Text="Outbox" ImageSource="/Images/outbox.png"/>
<syncfusion:GroupViewItem Name="groupViewItem10" Text="Sent Items" ImageSource="/Images/sent.png"/>
<syncfusion:GroupViewItem Name="groupViewItem11" Text="Spam" ImageSource="/Images/spam.png"/>
<syncfusion:GroupViewItem Name="groupViewItem12" Text="Trash" ImageSource="/Images/trash.png"/>
</syncfusion:GroupView>
</syncfusion:GroupBarItem>
<!--GroupBarItem -->
<syncfusion:GroupBarItem HeaderText="Drafts"/>
</syncfusion:GroupBar>
Screenshot
Figure: Before customization, GroupBarItem content height cannot be resize.
Figure: After customization, GroupBarItem content height can be resize by using GridSplitter.
Sample: GroupBarSample
Conclusion
I hope you enjoyed learning about how to provide resizing option for GroupBarItem content.
You can refer to our WPF GroupBar feature tour page to know about its other groundbreaking feature representations. You can also explore our WPF GroupBar documentation to understand how to present and manipulate data.
For current customers, you can check out our WPF from the License and Downloads page. If you are new to Syncfusion, you can try our 30-day free trial to check out our WPF GroupBar and other WPF Controls.
If you have any queries or require clarifications, please let us know in comments below. You can also contact us through our support forums, Direct-Trac, or feedback portal. We are always happy to assist you!
