您必須通過更改ToggleButton列來自定義TreeViewItem ControlTemplate。然後,您可以在樣式中使用DataTrigger更改控件模板。
<Style x:Key="{x:Type TreeViewItem}" TargetType="{x:Type TreeViewItem}">
<!-- snip -->
<ControlTemplate TargetType="{x:Type TreeViewItem}">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition MinWidth="19" Width="Auto"/>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition/>
</Grid.RowDefinitions>
<ToggleButton Grid.Column="1" x:Name="Expander"
Style="{StaticResource ExpandCollapseToggleStyle}"
IsChecked="{Binding Path=IsExpanded,
RelativeSource={RelativeSource TemplatedParent}}"
ClickMode="Press"/>
<Border Name="Bd"
Grid.Column="0"
Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
Padding="{TemplateBinding Padding}">
<ContentPresenter x:Name="PART_Header"
ContentSource="Header"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"/>
</Border>
<ItemsPresenter x:Name="ItemsHost"
Grid.Row="1"
Grid.Column="1"
Grid.ColumnSpan="2"/>
</Grid>
<ControlTemplate.Triggers>
<!-- snip -->
</ControlTemplate.Triggers>
</ControlTemplate>
</Style>
謝謝。多數民衆贊成我是如何嘗試它。但問題是,子項目(進入ItemsPresenter的),然後確實也有右側的擴展按鈕... – user1130329 2013-02-15 07:51:19
只需在綁定到對象的level屬性的datatrigger中設置模板 – mathieu 2013-02-15 07:52:38
您的意思是我應該在數據觸發器內切換CONTROLtemplate? – user1130329 2013-02-15 08:05:06