I have a TreeView
where parent and child nodes are bound to the same object type. What I want to do is have extra space, or create some other way to separate, only the top level nodes.
For example, if it looks like this normally:
A
B
C
F
D
E
I want it to look like this:
A
B
C
F
(space here)
D
E
Below is my code - There is already a lot of styling in order to use the TreeView as a ComboBox.
<TreeView
x:Name="GroupsCB"
Style="{StaticResource TreeViewBoxStyle}"
ItemsSource="{Binding Mode=OneTime}"
ItemContainerStyle="{StaticResource TreeViewItemStyle}"
ItemTemplate="{StaticResource GroupTreeItemTemplate}"
HorizontalAlignment="Right"
VerticalAlignment="Center"
Margin="0,4,97,0"
Width="120" Height="26"
SelectedItemChanged="GroupsCB_SelectedItemChanged"
/>
<Style x:Key="TreeViewItemStyle" TargetType="TreeViewItem">
<Setter Property="IsExpanded" Value="True" />
</Style>
<Style x:Key="TreeViewBoxStyle" TargetType="{x:Type TreeView}">
<Setter Property="VerticalAlignment" Value="Top" />
<Setter Property="HorizontalContentAlignment" Value="Left" />
<Setter Property="Padding" Value="5,0,0,0" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TreeView}">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<ToggleButton Content="{TemplateBinding SelectedItem, Converter={StaticResource GroupNameConv}}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
Grid.Row="0" Height="22" Padding="{TemplateBinding Padding}" x:Name="titleButton">
<ToggleButton.Style>
<Style TargetType="{x:Type ToggleButton}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ToggleButton}">
<Border Background="Transparent" BorderBrush="Black" BorderThickness="1,1,1,1">
<Grid>
<Path HorizontalAlignment="Right" x:Name="Arrow" VerticalAlignment="Center" Fill="Black"
Data="M 0 0 L 4 4 L 8 0 Z" UseLayoutRounding="False" Margin="0,0,5,0"/>
<ContentPresenter Margin="5,0,0,0" />
</Grid>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<DataTrigger Binding="{Binding ElementName=GroupsCB, Path=SelectedItem}">
<Setter Property="IsChecked" Value="false" />
</DataTrigger>
</Style.Triggers>
</Style>
</ToggleButton.Style>
</ToggleButton>
<Popup IsOpen="{Binding IsChecked, ElementName=titleButton}" Placement="Bottom" Focusable="False" AllowsTransparency="True" PopupAnimation="Slide" Grid.Row="1">
<Border BorderBrush="Black" BorderThickness="1,1,1,1" Background="White" MinWidth="{TemplateBinding ActualWidth}" Height="auto">
<ScrollViewer>
<ItemsPresenter/>
</ScrollViewer>
</Border>
</Popup>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
<HierarchicalDataTemplate
x:Key="GroupTreeItemTemplate"
ItemsSource="{Binding Children, Mode=OneTime}"
>
<StackPanel Orientation="Horizontal">
<StackPanel.Resources>
</StackPanel.Resources>
<ContentPresenter
Content="{Binding Name, Mode=OneTime}"
Margin="2,0,0,0"
/>
</StackPanel>
</HierarchicalDataTemplate>
Ok, lets dig up some old question:)
Just use different ItemContainerStyle
for the top level and nested levels. The TreeView.ItemContainerStyle
will target the top-level items, while the HierarchicalDataTemplate.ItemContainerStyle
will target nested items.
<Style x:Key="TreeViewItemStyle" TargetType="TreeViewItem">
<Setter Property="IsExpanded" Value="True" />
</Style>
<!-- Special style for the top level with top/bottom margin of 5 -->
<Style x:Key="TopTreeViewItemStyle" TargetType="TreeViewItem" BasedOn="{StaticResource TreeViewItemStyle}">
<Setter Property="Margin" Value="0 5" />
</Style>
...
<TreeView
x:Name="GroupsCB"
Style="{StaticResource TreeViewBoxStyle}"
ItemsSource="{Binding Mode=OneTime}"
ItemContainerStyle="{StaticResource TopTreeViewItemStyle}"
...
<HierarchicalDataTemplate
x:Key="GroupTreeItemTemplate"
ItemsSource="{Binding Children, Mode=OneTime}"
ItemContainerStyle="{StaticResource TreeViewItemStyle}"
Use demo2 here : and add a top margin to the StackPanel for your top level HierarchicalDataTemplate
eg:
<HierarchicalDataTemplate
DataType="{x:Type local:TopLevelViewModel}"
ItemsSource="{Binding Children}"
>
<StackPanel Orientation="Horizontal" Margin="0,20,0,0">
<TextBlock Text="{Binding Name}" />
</StackPanel>
</HierarchicalDataTemplate>
Try out this
<TreeView>
<TreeViewItem Header="Employee1">
<TreeViewItem Header="Jesper"/>
<TreeViewItem Header="Aaberg"/>
<TreeViewItem Header="12345"/>
</TreeViewItem>
**<Separator />**
<TreeViewItem Header="Employee2">
<TreeViewItem Header="Dominik"/>
<TreeViewItem Header="Paiha"/>
<TreeViewItem Header="98765"/>
</TreeViewItem>
</TreeView>
Or u can make a DataTemplate for the Items with the Separator inside that template
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.