我有一个包含UserControl的{{1}}子类，后者又包含一对Grid和一个TextBlock（其中还包含Border ）。请参阅下面的代码。
TextBlock当我的 <UserControl x:Class="ProjectNS.MyUserControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:my="clr-namespace:ProjectNS"
mc:Ignorable="d"
Height="49" Width="150" BottomResizeLocked="True" TopResizeLocked="True"
MoveLocks="Vertical" Margin="0,-4" Focusable="True">
<my:MyUserControl.Resources>
<Style x:Key="BorderStyle" TargetType="Border">
<Setter Property="Background" Value="Blue"/>
<Setter Property="BorderBrush" Value="Blue"/>
<Style.Triggers>
<DataTrigger Binding="{Binding RelativeSource={RelativeSource
AncestorType={x:Type my:GanttBar}}, Path=IsKeyboardFocusWithin}"
Value="True">
<Setter Property="Background" Value="{StaticResource
SelectedGanttBarBackGroundBrush}"/>
<Setter Property="BorderBrush" Value="{StaticResource
SelectedGanttBarBorderBrush}"/>
</DataTrigger>
</Style.Triggers>
</Style>
</my:MyUserControl.Resources>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="2*" />
<RowDefinition Height="3*" />
<RowDefinition Height="2*" />
</Grid.RowDefinitions>
<Label FontSize="8.5" HorizontalAlignment="Left"
VerticalAlignment="Bottom" Margin="4,0,0,0" Foreground="Green" />
<Border Grid.Row="1" CornerRadius="5" BorderThickness="1.5" Style="
{StaticResource BorderStyle}" FocusVisualStyle="{StaticResource
SelectedBorderStyle}" Focusable="True" >
<Label FontSize="10" HorizontalAlignment="Center" FontWeight="Bold"
VerticalAlignment="Top" Foreground="White" Margin="0,2,0,0" />
</Border>
<Label HorizontalAlignment="Right" FontSize="8.5" Grid.Row="2"
VerticalAlignment="Top" Margin="0,0,4,0" Foreground="Red" />
</Grid>
</my:MyUserControl>
获得焦点时，我正试图让嵌入边框的颜色改变颜色，但我不能为我的生活找出当我点击控件时实际获得焦点的内容。我已经尝试对每个控件使用UserControl事件，并且一旦程序运行就不会触发。
答案 0 :(得分：1)
在属性IsKeyboardFocusWithin上使用DataTrigger。我不是肯定的确切语法，但它应该看起来像这样：
<Style TargetType="{x:Type Border}">
<Setter Property="BorderBrush" Value="Red" />
<Style.Triggers>
<!-- Will change Border color when KeyboardFocus inside Border -->
<Trigger Property="IsKeyboardFocusWithin" Value="True">
<Setter Property="BorderBrush" Value="Green" />
</Trigger>
<!-- Will change Border color when UserControl contains KeyboardFocus -->
<DataTrigger Binding="{Binding RelativeSource={RelativeSource
AncestorType={x:Type local:MyUserControl}},
Path=IsKeyboardFocusWithin}" Value="True">
<Setter Property="BorderBrush" Value="Blue" />
</DataTrigger>
</Style.Triggers>
</Style>