当面板中的元素具有焦点时,更改WPF StackPanel背景颜色

Question

如果我在StackPanel中有一组控件,当StackPanel中的任何控件获得焦点时,是否有通用的方法来更改stackpanel的背景？(当StackPanel中的控件没有焦点时,显然会切换背景).下面的代码对我有用,但是有一个通用的方法来完成这个任务,而不必在我的页面中的每个StackPanel中列出每个控件.

谢谢!

<StackPanel Margin="5">
    <StackPanel.Style>
    <Style TargetType="{x:Type StackPanel}">
        <Style.Triggers>
            <DataTrigger Binding="{Binding IsFocused, ElementName=chkOccupiedByMortgagor}" Value="true">
                <Setter Property="Background" Value="Gray" />
                <Setter Property="Opacity" Value=".5" />
            </DataTrigger>
            <DataTrigger Binding="{Binding IsFocused, ElementName=chkOccupiedByNewOwner}" Value="true">
                <Setter Property="Background" Value="Gray" />
                <Setter Property="Opacity" Value=".5" />
            </DataTrigger>
        </Style.Triggers>
    </Style>
</StackPanel.Style>
<CheckBox Margin="2" x:Name="chkOccupiedByMortgagor">Mortgagor</CheckBox>
<CheckBox Margin="2" x:Name="chkOccupiedByNewOwner">New Owner</CheckBox>
<CheckBox Margin="2" x:Name="chkOccupiedByTenant">Tenant</CheckBox>
<CheckBox Margin="2" x:Name="chkOccupiedByUnknownOccupant">Unknown Occupant</CheckBox>
</StackPanel> 

Answer 1

是.你可以做到这一点.只需使用IsKeyboardFocusWithin属性作为触发器,如下所示:

<StackPanel Margin="5">
    <StackPanel.Style>
        <Style TargetType="{x:Type StackPanel}">
            <Style.Triggers>
                    <DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Path=IsKeyboardFocusWithin}" Value="True">
                    <Setter Property="Background" Value="Gray" />
                    <Setter Property="Opacity" Value=".5" />
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </StackPanel.Style>
    <CheckBox Margin="2">Mortgagor</CheckBox>
    <CheckBox Margin="2">New Owner</CheckBox>
    <CheckBox Margin="2">Tenant</CheckBox>
    <CheckBox Margin="2">Unknown Occupant</CheckBox>
</StackPanel>

但请记住,您需要告诉触发器在同一元素中查找属性,因此,RelativeSource={RelativeSource Self}.或者,您可以命名堆栈面板并使用此xaml:

<StackPanel Margin="5" x:Name="stackPanel">
    ...
                <DataTrigger Binding="{Binding ElementName=stackPanel, Path=IsKeyboardFocusWithin}" Value="True">
    ...