Have used the method to set a fullrowselect for TreeViewItems
here: Lee Campbell horizontal stretch for treeviewitems
This works well for the top level items.
But there seems to be a problem with the TreeViewItem.Items
collection, which seems not to take the right template.
(I see it is not in the TreeView.Items collection, as the template suggests)
Is there an easy way to derive the subitem style from the parent item style?
How can I describe the style once (for all TreeviewItems) and let the style
be used for all TreeViewItems, whether they are in the TreeView.Items or
in the TreeViewItem.Items collection?
Here is my XAML, some code is from the LeeCampbell example.
<Window x:Class="TreeViewFullRow.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:TreeViewFullRow"
Title="MainWindow"
Width="525"
Height="350">
<Window.Resources />
<Grid>
<TreeView Name="TreeData"
Width="236"
Height="311"
HorizontalAlignment="Left"
VerticalAlignment="Top">
<TreeView.ItemContainerStyle>
<Style BasedOn="{StaticResource {x:Type TreeViewItem}}" TargetType="TreeViewItem">
<Setter Property="HorizontalContentAlignment" Value="Center" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="TreeViewItem">
<StackPanel>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" MinWidth="19" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition />
</Grid.RowDefinitions>
<!--
Note that the following do not work, but I believe the top 2 should?!
<ToggleButton IsChecked="{TemplateBinding IsExpanded}" ClickMode="Press" Name="Expander">
<ToggleButton IsChecked="{TemplateBinding Property=IsExpanded}" ClickMode="Press" Name="Expander">
<ToggleButton IsChecked="{TemplateBinding Path=IsExpanded}" ClickMode="Press" Name="Expander">
-->
<ToggleButton Name="Expander"
ClickMode="Press"
IsChecked="{Binding Path=IsExpanded,
RelativeSource={RelativeSource TemplatedParent}}">
<ToggleButton.Style>
<Style TargetType="ToggleButton">
<Setter Property="UIElement.Focusable" Value="false" />
<Setter Property="FrameworkElement.Width" Value="16" />
<Setter Property="FrameworkElement.Height" Value="16" />
<Setter Property="Control.Template">
<Setter.Value>
<ControlTemplate TargetType="ToggleButton">
<Border Width="16"
Height="16"
Background="#00FFFFFF"
Padding="5,5,5,5">
<Path Name="ExpandPath"
Fill="#00FFFFFF"
Stroke="#FF989898">
<Path.Data>
<PathGeometry Figures="M0,0L0,6L6,0z" />
</Path.Data>
<Path.RenderTransform>
<RotateTransform Angle="135" CenterX="3" CenterY="3" />
</Path.RenderTransform>
</Path>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="UIElement.IsMouseOver" Value="True">
<Setter TargetName="ExpandPath" Property="Shape.Stroke" Value="#FF1BBBFA" />
<Setter TargetName="ExpandPath" Property="Shape.Fill" Value="#00FFFFFF" />
</Trigger>
<Trigger Property="ToggleButton.IsChecked" Value="True">
<Setter TargetName="ExpandPath" Property="UIElement.RenderTransform">
<Setter.Value>
<RotateTransform Angle="180" CenterX="3" CenterY="3" />
</Setter.Value>
</Setter>
<Setter TargetName="ExpandPath" Property="Shape.Fill" Value="#FF595959" />
<Setter TargetName="ExpandPath" Property="Shape.Stroke" Value="#FF262626" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ToggleButton.Style>
</ToggleButton>
<Border x:Name="Bd"
Grid.Column="1"
HorizontalAlignment="Stretch"
Background="{TemplateBinding Panel.Background}"
BorderBrush="{TemplateBinding Border.BorderBrush}"
BorderThickness="{TemplateBinding Border.BorderThickness}"
Padding="{TemplateBinding Control.Padding}"
SnapsToDevicePixels="True">
<ContentPresenter x:Name="PART_Header"
HorizontalAlignment="{TemplateBinding Control.HorizontalContentAlignment}"
Content="{TemplateBinding HeaderedContentControl.Header}"
ContentSource="Header"
ContentStringFormat="{TemplateBinding HeaderedItemsControl.HeaderStringFormat}"
ContentTemplate="{TemplateBinding HeaderedContentControl.HeaderTemplate}"
ContentTemplateSelector="{TemplateBinding HeaderedItemsControl.HeaderTemplateSelector}"
SnapsToDevicePixels="{TemplateBinding UIElement.SnapsToDevicePixels}" />
</Border>
<ItemsPresenter x:Name="ItemsHost"
Grid.Row="1"
Grid.Column="1" />
</Grid>
</StackPanel>
<ControlTemplate.Triggers>
<Trigger Property="TreeViewItem.IsExpanded" Value="False">
<Setter TargetName="ItemsHost" Property="UIElement.Visibility" Value="Collapsed" />
</Trigger>
<Trigger Property="ItemsControl.HasItems" Value="False">
<Setter TargetName="Expander" Property="UIElement.Visibility" Value="Hidden" />
</Trigger>
<Trigger Property="TreeViewItem.IsSelected" Value="True">
<Setter TargetName="Bd" Property="Panel.Background" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}" />
<Setter Property="TextElement.Foreground" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}" />
</Trigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="TreeViewItem.IsSelected" Value="True" />
<Condition Property="Selector.IsSelectionActive" Value="False" />
</MultiTrigger.Conditions>
<Setter TargetName="Bd" Property="Panel.Background" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}" />
<Setter Property="TextElement.Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}" />
</MultiTrigger>
<Trigger Property="UIElement.IsEnabled" Value="False">
<Setter Property="TextElement.Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</TreeView.ItemContainerStyle>
</TreeView>
<Button Name="BtnLoad"
Width="75"
Height="23"
Margin="277,12,0,0"
HorizontalAlignment="Left"
VerticalAlignment="Top"
Click="OnBtnLoad"
Content="Load data" />
</Grid>
</Window>
This is very easy. In the button click handler I add new Items to the
TreeView. This is the code:
private void OnBtnLoad(object sender, RoutedEventArgs e)
{
var count = this.TreeData.Items.Count.ToString();
var parent = new TreeViewItem() { Name = "Name_" + count, Header = "Header_" + count };
this.TreeData.Items.Add(parent);
var child0 = new TreeViewItem() { Name = "Name_" + count + "_0", Header = "Header_" + count + "_0" };
var child1 = new TreeViewItem() { Name = "Name_" + count + "_1", Header = "Header_" + count + "_1" };
var child2 = new TreeViewItem() { Name = "Name_" + count + "_2", Header = "Header_" + count + "_2" };
parent.Items.Add(child0);
parent.Items.Add(child1);
parent.Items.Add(child2);
parent.Items.Refresh();
}
If you put the style further up the visual tree it would affect the items and subitems in the treeview. For example you could put the style in
Grid.Resourcesor inWindow.Resourcesinstead of having it in theTreeView.ItemContainerStyleas you do now.