我真的不知道如何问这个，但我有一个特定的风格，我想在我的 TreeView 上实现。
所以据我了解 TreeView 控件，当您展开 TreeViewItem 时节点来查看它的子节点，它会创建一个新的 ItemsPresenter那是新子节点的 TreeViewItem 的容器。这意味着所有子节点都连接到它们的每个父节点。
我想要实现的是，当子节点展开到 View 中并选择父节点时，用户将鼠标悬停在子节点之一上，父节点仍然激活了默认的选定样式。而不是通过将鼠标悬停在其子节点之一上来激活 IsMouseOver 样式。
这是一个例子:
选定的父颜色
选择父节点并将鼠标悬停在子节点上时会发生什么
What I want it to look like when parent node is selected and when hovering over one of it's children (excuse my amazing paint skills with this one)
这是我的代码供引用
TreeView
<TreeView Background="{x:Null}" BorderThickness="0" Margin="0,3,0,0">
<TreeViewItem Header="Root Node" IsExpanded="True">
<TreeViewItem Header="Parent Node" IsExpanded="True">
<TreeViewItem Header="Child Node" IsExpanded="True">
<TreeViewItem Header="Child Node" IsExpanded="True">
<TreeViewItem Header="Child Node" IsExpanded="True" IsSelected="True"/>
</TreeViewItem>
</TreeViewItem>
</TreeViewItem>
...
<TreeViewItem Header="Child Node">
<TreeViewItem Header="Child Node"/>
<TreeViewItem Header="Child Node"/>
</TreeViewItem>
<TreeViewItem Header="Child Node"/>
</TreeViewItem>
</TreeView>
风格
<Style x:Key="{x:Type TreeViewItem}" TargetType="{x:Type TreeViewItem}">
<Setter Property="Background" Value="Transparent"/>
<Setter Property="HorizontalContentAlignment" Value="{Binding HorizontalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
<Setter Property="VerticalContentAlignment" Value="{Binding VerticalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
<Setter Property="Padding" Value="1,0,0,0"/>
<Setter Property="Foreground" Value="Black"/>
<Setter Property="FocusVisualStyle" Value="{StaticResource TreeViewItemFocusVisual}"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TreeViewItem}">
<StackPanel>
<Border x:Name="Bd" Grid.ColumnSpan="3" BorderThickness="1" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="true" Margin="3,0,3,-1" MinHeight="20">
<Border.Style>
<Style TargetType="{x:Type Border}">
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="true">
<Setter Property="Background" Value="Red"/>
<Setter Property="BorderBrush" Value="Black"/>
</Trigger>
<Trigger Property="IsMouseOver" Value="false">
<Setter Property="Background" Value="Transparent"/>
</Trigger>
</Style.Triggers>
</Style>
</Border.Style>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition MinWidth="19" Width="Auto"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<ToggleButton x:Name="Expander" ClickMode="Press" IsChecked="{Binding IsExpanded, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ExpandCollapseToggleStyle}"/>
<ContentPresenter x:Name="PART_Header" ContentSource="Header" Grid.Column="1" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
</Grid>
</Border>
<ItemsPresenter x:Name="ItemsHost" Grid.ColumnSpan="2" Grid.Column="1" Grid.Row="1"/>
</StackPanel>
<ControlTemplate.Triggers>
<Trigger Property="IsExpanded" Value="false">
<Setter Property="Visibility" TargetName="ItemsHost" Value="Collapsed"/>
</Trigger>
<Trigger Property="HasItems" Value="false">
<Setter Property="Visibility" TargetName="Expander" Value="Hidden"/>
</Trigger>
<Trigger Property="IsSelected" Value="true">
<Setter Property="Background" TargetName="Bd" Value="Green"/>
<Setter Property="BorderBrush" TargetName="Bd" Value="Black"/>
</Trigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsSelected" Value="true"/>
<Condition Property="IsMouseOver" Value="true"/>
</MultiTrigger.Conditions>
<Setter Property="Background" TargetName="Bd" Value="Red"/>
</MultiTrigger>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
如果有人有任何提示可以帮助我实现这一目标，我将不胜感激。此外，如果我尝试在 XAML 中而不是在 C# 中完成大部分工作，但如果无法完成，我很乐意在 C# 中完成。谢谢。
最佳答案
我只是在这里添加了一些代码。
<Style x:Key="{x:Type TreeViewItem}" TargetType="{x:Type TreeViewItem}">
<Setter Property="Background" Value="Transparent"/>
<Setter Property="HorizontalContentAlignment" Value="{Binding HorizontalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
<Setter Property="VerticalContentAlignment" Value="{Binding VerticalContentAlignment, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}}"/>
<Setter Property="Padding" Value="1,0,0,0"/>
<Setter Property="Foreground" Value="Black"/>
<Setter Property="FocusVisualStyle" Value="{StaticResource TreeViewItemFocusVisual}"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TreeViewItem}">
<StackPanel>
<Border x:Name="Bd" Grid.ColumnSpan="3" BorderThickness="1" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="true" Margin="3,0,3,-1" MinHeight="20">
<Border.Style>
<Style TargetType="{x:Type Border}">
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="true">
<Setter Property="Background" Value="Red"/>
<Setter Property="BorderBrush" Value="Black"/>
</Trigger>
<Trigger Property="IsMouseOver" Value="false">
<Setter Property="Background" Value="Transparent"/>
</Trigger>
</Style.Triggers>
</Style>
</Border.Style>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition MinWidth="19" Width="Auto"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<ToggleButton x:Name="Expander" ClickMode="Press" IsChecked="{Binding IsExpanded, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ExpandCollapseToggleStyle}"/>
<ContentPresenter x:Name="PART_Header" ContentSource="Header" Grid.Column="1" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
</Grid>
</Border>
<ItemsPresenter x:Name="ItemsHost" Grid.ColumnSpan="2" Grid.Column="1" Grid.Row="1"/>
</StackPanel>
<ControlTemplate.Triggers>
<Trigger Property="IsExpanded" Value="false">
<Setter Property="Visibility" TargetName="ItemsHost" Value="Collapsed"/>
</Trigger>
<Trigger Property="HasItems" Value="false">
<Setter Property="Visibility" TargetName="Expander" Value="Hidden"/>
</Trigger>
<Trigger Property="IsSelected" Value="true">
<Setter Property="Background" TargetName="Bd" Value="Green"/>
<Setter Property="BorderBrush" TargetName="Bd" Value="Black"/>
</Trigger>
<MultiTrigger>
<MultiTrigger.Conditions>
<Condition Property="IsSelected" Value="true"/>
<Condition Property="IsMouseOver" Value="true"/>
</MultiTrigger.Conditions>
<Setter Property="Background" TargetName="Bd" Value="Red"/>
</MultiTrigger>
<Trigger Property="IsEnabled" Value="false">
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
</Trigger>
<!--begin: I added just this, but you can cleanup your xaml and made it better, this just showing how you can do-->
<MultiDataTrigger>
<MultiDataTrigger.Conditions>
<Condition Binding="{Binding RelativeSource={RelativeSource Self}, Path=IsSelected}" Value="true"/>
<Condition Binding="{Binding RelativeSource={RelativeSource Self}, Path=IsMouseOver}" Value="true"/>
<Condition Binding="{Binding ElementName=ItemsHost, Path=IsMouseOver}" Value="True"/>
</MultiDataTrigger.Conditions>
<Setter Property="Background" TargetName="Bd" Value="Green"/>
</MultiDataTrigger>
<!--end-->
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
关于c# - 将鼠标悬停在子节点上时，TreeViewItem 父节点和子节点 IsSelected 分离，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/53153284/