如何更改在WPF树视图节点的图像时的节点展开或折叠? [英] How do I change an image of a node in a WPF treeview when the node is expanded or collapsed?
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问题描述
我的XAML是这样的:
My Xaml looks like this:
<TreeView Name="mainTree" ItemsSource="{Binding Folders}">
<TreeView.Resources>
<Style TargetType="{x:Type TreeViewItem}">
<Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
<Style.Triggers>
<!-- ??? -->
</Style.Triggers>
</Style>
<HierarchicalDataTemplate DataType="{x:Type local:FolderNode}" ItemsSource="{Binding Children}" >
<StackPanel Orientation="Horizontal" Name="myPanel">
<Image x:Name="treeImg" Width="16" Height="16" Source="Images/vsfolder_closed.png"/>
<TextBlock Text="{Binding Name}" />
</StackPanel>
<HierarchicalDataTemplate.Triggers>
<!-- ??? -->
</HierarchicalDataTemplate.Triggers>
</HierarchicalDataTemplate>
</TreeView.Resources>
</TreeView>
现在我想是,如果一个TreeNode扩大,图像源更改图像/ vsfolder_open。 PNG ...
Now what I would like is if a treenode is expanded, the image source changes to Images/vsfolder_open.png...
什么是做到这一点的最简单的方法?
What would be the easiest way to do that?
谢谢!
推荐答案
添加DataTrigger到HierarchicalDataTemplate。既然你有双向绑定的属性IsExpanded在视图模型,你可以给它绑定和使用,因为在一个DataTemplate的名称范围中的TargetName。
Add a DataTrigger to the HierarchicalDataTemplate. Since you have two-way binding to the Property IsExpanded in the ViewModel you can bind to it and use TargetName because of the namescope in a DataTemplate.
<HierarchicalDataTemplate.Triggers>
<DataTrigger Binding="{Binding IsExpanded}" Value="True">
<Setter TargetName="treeImg"
Property="Source"
Value="Images/vsfolder_open.png"/>
</DataTrigger>
</HierarchicalDataTemplate.Triggers>
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