如何设置 WPF 扩展器标题的样式? [英] How to style a WPF Expander Header?

问题描述

我想在 WPF Expander Header 上应用样式.在下面的 XAML 中，我有一个 Expander，但样式适用于所有内容，而不仅仅是标题.

I would like to apply a style on a WPF Expander Header. In the following XAML I have an Expander but the style is for all of it not just for the header.

谢谢.

<Page
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Width="640"
>
    <StackPanel>
        <StackPanel.Resources>
            <Style TargetType="Expander">
                <Style.Resources>
                    <LinearGradientBrush x:Key="BackBrush" StartPoint="0.5,0" EndPoint="0.5,1">
                        <GradientStop Color="#EF3132" Offset="0.1" />
                        <GradientStop Color="#D62B2B" Offset="0.9" />
                    </LinearGradientBrush>
                </Style.Resources>
                <Setter Property="Background" Value="{StaticResource BackBrush}"/>
            </Style>
        </StackPanel.Resources>
        <Expander>
            <StackPanel>
                <TextBlock>Bike</TextBlock>
                <TextBlock>Car</TextBlock>
                <TextBlock>Truck</TextBlock>
            </StackPanel>
        </Expander>
    </StackPanel>
</Page>

推荐答案

我结合了一些来自 Josh Smith 和 MSDN 并想出了一个解决方案.实际上，控件(至少是标题)必须重新模板化.

I have combined some XAML from Josh Smith and MSDN and came up with a solution. Indeed, the control (al least the header) must be retemplated.

<Page
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Width="400">
    <StackPanel>
        <StackPanel.Resources>

            <Style TargetType="Border" x:Key="RacePitBorderStyle" >
                <Style.Resources>
                    <LinearGradientBrush x:Key="BackBrush" StartPoint="0.5,0" EndPoint="0.5,1">
                        <GradientStop Color="#EF3132" Offset="0.1" />
                        <GradientStop Color="#D62B2B" Offset="0.9" />
                    </LinearGradientBrush>
                </Style.Resources>
                <Setter Property="Background" Value="{StaticResource BackBrush}"/>
            </Style>

            <DataTemplate x:Key="titleText">
                <Border Style="{StaticResource RacePitBorderStyle}" Height="24">
                    <TextBlock Text="{Binding}" 
                        Margin="4 0"
                        VerticalAlignment="Center"
                        Foreground="White"
                        FontSize="11" 
                        FontWeight="Normal"
                        Width="{Binding
                        RelativeSource={RelativeSource
                        Mode=FindAncestor,
                        AncestorType={x:Type Expander}},
                        Path=ActualWidth}"
                        TextWrapping="Wrap"/>
                </Border>
            </DataTemplate>

            <Style TargetType="{x:Type Expander}">
                <Setter Property="HeaderTemplate" Value="{StaticResource titleText}"/>
            </Style>

        </StackPanel.Resources>

        <Expander Name="hcontCtrl" Header="This is the header.">
            <StackPanel>
                <TextBox>This is a textbox</TextBox>
                <Button>A button</Button>
            </StackPanel>
        </Expander>

    </StackPanel>
</Page>

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