Wpf 如何在应用列标题背景后重新添加排序箭头

将背景色应用于列标题后，缺少排序箭头。如何将其添加回？

我认为您必须重新设置DataGridColumnHeader的模板，然后从那里添加它。这里有一个例子。您必须添加对PresentationFramework.Aero的引用

xmlns:Themes="clr-namespace:Microsoft.Windows.Themes;assembly=PresentationFramework.Aero"

<DataGrid ...>
    <DataGrid.Resources>
        <Style x:Key="ColumnHeaderGripperStyle" TargetType="{x:Type Thumb}">
            <Setter Property="Width" Value="8"/>
            <Setter Property="Background" Value="Transparent"/>
            <Setter Property="Cursor" Value="SizeWE"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Thumb}">
                        <Border Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}"/>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
        <Style TargetType="{x:Type DataGridColumnHeader}">
            <Setter Property="Background" Value="Blue"/>
            <Setter Property="BorderBrush" Value="Red"/>
            <Setter Property="BorderThickness" Value="1,1,1,1"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type DataGridColumnHeader}">
                        <Grid>
                            <Themes:DataGridHeaderBorder BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" IsClickable="{TemplateBinding CanUserSort}" IsPressed="{TemplateBinding IsPressed}" IsHovered="{TemplateBinding IsMouseOver}" Padding="{TemplateBinding Padding}" SortDirection="{TemplateBinding SortDirection}" SeparatorBrush="{TemplateBinding SeparatorBrush}" SeparatorVisibility="{TemplateBinding SeparatorVisibility}">
                                <Grid>
                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition Width="Auto"/>
                                        <ColumnDefinition Width="*"/>
                                    </Grid.ColumnDefinitions>
                                    <ContentPresenter Grid.Column="0" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                                    <Path x:Name="SortArrow"
                                            Grid.Column="1"
                                            HorizontalAlignment="Right" VerticalAlignment="Center"                                           
                                            Width="8" Height="6" Margin="2,0,5,0"
                                            Stretch="Fill" Opacity="0.5" Fill="White"
                                            RenderTransformOrigin="0.5,0.4"
                                            Visibility="Collapsed"
                                            Data="M0,0 L1,0 0.5,1 z" />
                                </Grid>
                            </Themes:DataGridHeaderBorder>
                            <Thumb x:Name="PART_LeftHeaderGripper" HorizontalAlignment="Left" Style="{StaticResource ColumnHeaderGripperStyle}"/>
                            <Thumb x:Name="PART_RightHeaderGripper" HorizontalAlignment="Right" Style="{StaticResource ColumnHeaderGripperStyle}"/>
                        </Grid>
                        <ControlTemplate.Triggers>
                            <Trigger Property="SortDirection" Value="Ascending">
                                <Setter TargetName="SortArrow" Property="Visibility" Value="Visible" />
                                <Setter TargetName="SortArrow" Property="RenderTransform">
                                    <Setter.Value>
                                        <RotateTransform Angle="180" />
                                    </Setter.Value>
                                </Setter>
                            </Trigger>
                            <Trigger Property="SortDirection" Value="Descending">
                                <Setter TargetName="SortArrow" Property="Visibility" Value="Visible" />
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </DataGrid.Resources>
</DataGrid>

xmlns:Themes=“clr命名空间：Microsoft.Windows.Themes；assembly=PresentationFramework.Aero”

可能有更好的解决方案，但我只是简单地添加了字符▴ 或▾ 根据排序方向添加到列标题。

以下是一篇博客文章，它很好地分解了DataGridColumnHeader的模板过程，并提供了结果的视觉效果

his演示了默认的列标题。单击列标题以替换列。您还可以通过拖动标题来重新排列列的顺序，并通过拖动标题任一端的隐藏拇指来调整列的大小标题本身显然是文本上方带有可选排序指示器的按钮。看起来很恶心

让我们尝试更改标题的背景，使其不是一个明显的按钮。DataGrid具有ColumnHeaderStyle属性。我们可以使用它，但为了简单起见，让我们为列标题创建一个默认样式，将其添加到XAML

<Window.Resources>
    <Style TargetType="{x:Type DataGridColumnHeader}">
        <Setter Property="Background" Value="LightGray"/>
    </Style>
</Window.Resources>

如果使用新样式运行项目，标题看起来会更好。但是等等，我们的分类指示器去哪里了？事实证明，DataGridColumnHeader故意设置了样式，以便在更改背景颜色时隐藏排序指示符。有时候，我真的不明白微软是如何继续经营下去的。为什么你会设计这样一个丑陋的控件，然后在开发人员试图修复它时破坏其他关键功能

我们必须重新设置DataGridColumnHeader的模板。当我们在里面的时候，让我们玩得开心点！这就是我们要做的

更改背景色 使用边框创建下划线 当鼠标悬停在标题上时，更改边框的颜色 将排序指示器移到标题文本的一侧，而不是上方 使列宽拇指不可见，但在其上时更改光标

步骤1-加强样式，使其看起来像这样

<Style TargetType="{x:Type DataGridColumnHeader}">
    <Setter Property="SnapsToDevicePixels" Value="True"/>
    <Setter Property="MinWidth" Value="0"/>
    <Setter Property="MinHeight" Value="0"/>
    <Setter Property="Foreground" Value="Black"/>
    <Setter Property="Background" Value="LightGray"/>
    <Setter Property="Cursor" Value="Hand"/>
</Style>

步骤2-编写定义标题区域、排序指示器、边框和拇指的控制模板。网格控制标题的布局，内容区域位于左侧，排序指示器位于右侧。注意：排序指示器是使用路径定义的。这两个矩形为列标题生成可见的左边缘和右边缘。必须定义拇指，并允许用户调整列的大小。稍后我们将定义ThumbStyle。请注意边框的名称。我们需要这个，这样我们就可以在第3步中使用触发器来修改它。将其添加到结束样式标记之前

<Setter Property="Template">
    <Setter.Value>
        <ControlTemplate TargetType="{x:Type DataGridColumnHeader}">
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="*"/>
                    <ColumnDefinition Width="Auto"/>
                </Grid.ColumnDefinitions>
                <Border x:Name="BackgroundBorder" BorderThickness="0,0,0,2"
                        Background="LightGray"
                        BorderBrush="Black"
                        Grid.ColumnSpan="2"/>
                <ContentPresenter Margin="6,3,6,3" VerticalAlignment="Center"/>
                <Path x:Name="SortArrow" Visibility="Collapsed" Data="M 0,0 L 1,0 0.5,1 z" Stretch="Fill"
                     Grid.Column="1" Width="8" Height="6" Fill="Black" Margin="0,0,8,0"
                      VerticalAlignment="Center" RenderTransformOrigin="0.5, 0.4"/>
                <Rectangle Width="1" Fill="#EEEEEE" HorizontalAlignment="Right" Grid.ColumnSpan="2"/>
                <Rectangle Width="1" Margin="0,0,1,0" Fill="#DDDDDD" HorizontalAlignment="Right" Grid.ColumnSpan="2"/>
                <Thumb x:Name="PART_LeftHeaderGripper" HorizontalAlignment="Left" Style="{StaticResource ThumbStyle}"/>
                <Thumb x:Name="PART_RightHeaderGripper" Grid.Column="1" HorizontalAlignment="Right" Style="{StaticResource ThumbStyle}"/>
            </Grid>
        </ControlTemplate>
    </Setter.Value>
</Setter>

步骤3-添加触发器以在鼠标移动到列标题上时更改边框颜色。在网格结束标记后添加以下触发器

<ControlTemplate.Triggers>
    <Trigger Property="IsMouseOver" Value="True">
        <Setter TargetName="BackgroundBorder" Property="Background" Value="LightGray"/>
        <Setter TargetName="BackgroundBorder" Property="BorderBrush" Value="Orange"/>
    </Trigger>
</ControlTemplate.Triggers>

步骤4-添加触发器，以便在对列进行排序时显示和/或旋转排序指示器

<Trigger Property="SortDirection" Value="Ascending">
    <Setter TargetName="SortArrow" Property="Visibility" Value="Visible"/>
    <Setter TargetName="SortArrow" Property="RenderTransform">
        <Setter.Value>
            <RotateTransform Angle="180"/>
        </Setter.Value>
    </Setter>
</Trigger>
<Trigger Property="SortDirection" Value="Descending">
    <Setter TargetName="SortArrow" Property="Visibility" Value="Visible"/>
</Trigger>

步骤5-将LeftHeaderGripper隐藏在第0列中-我们不需要它

<Trigger Property="DisplayIndex" Value="0">
    <Setter TargetName="PART_LeftHeaderGripper" Property="Visibility" Value="Collapsed"/>
</Trigger>

正如所承诺的，这里是拇指风格的定义。将其插入DataGridColumnHeader样式上方。我使用一个不可见的矩形，光标大小为SizeWE。如果你愿意，你可以给它上色或使用完全不同的东西

<Style TargetType="{x:Type Thumb}" x:Key="ThumbStyle">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type Thumb}">
                <Rectangle Width="1" Stroke="Transparent" Cursor="SizeWE"/>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

****更新：样式条目组合在一起**

<FontFamily x:Key="Corp_FontFamily">Segoe UI</FontFamily>
<clr:Double x:Key="Corp_FontSize">13</clr:Double>
<Style TargetType="{x:Type Control}" x:Key="baseStyle">
    <Setter Property="FontFamily" Value="{StaticResource Corp_FontFamily}" />
    <Setter Property="FontSize" Value="{StaticResource Corp_FontSize}" />
</Style>

<Color x:Key="CorpBlue_T1S1" A="255" R="172" G="180" B="196"/>
<SolidColorBrush x:Key="Brush_CorpBlue_T1S1" Color="{StaticResource CorpBlue_T1S1}"/>

<Color x:Key="CLR_Green" A="255" R="220" G="239" B="202"/>
<SolidColorBrush x:Key="YourCompany_HeaderColumnDefaultBackground" Color="{StaticResource CLR_Green}"/>

<Style TargetType="DataGridColumnHeader" x:Key="DG_Hdr_Base" BasedOn="{StaticResource baseStyle}">
    <Setter Property="SnapsToDevicePixels" Value="True"/>
    <Setter Property="MinWidth" Value="0"/>
    <Setter Property="MinHeight" Value="0"/>
    <Setter Property="Background" Value="{StaticResource YourCompany_HeaderColumnDefaultBackground}"/>
    <Setter Property="Cursor" Value="Hand"/>
    <Setter Property="Padding" Value="5"/>
    <Setter Property="BorderThickness" Value="0 0 1 0"/>
    <Setter Property="BorderBrush" Value="DarkGray"/>
    <Setter Property="HorizontalContentAlignment" Value="Center" />
    <Setter Property="TextBlock.TextAlignment" Value="Center" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="DataGridColumnHeader">
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="*"/>
                        <ColumnDefinition Width="Auto"/>
                    </Grid.ColumnDefinitions>
                    <Border x:Name="BackgroundBorder" BorderThickness="0,0,0,2"
                            Background="{TemplateBinding Background}"
                            BorderBrush="{TemplateBinding BorderBrush}"
                            Grid.ColumnSpan="2"/>
                    <ContentPresenter Margin="5" VerticalAlignment="Center" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"/>
                    <Path x:Name="SortArrow" Visibility="Collapsed" Data="M 0,0 L 1,0 0.5,1 z" Stretch="Fill"
                         Grid.Column="1" Width="8" Height="6" Fill="Black" Margin="0,0,8,0"
                          VerticalAlignment="Center" RenderTransformOrigin="0.5, 0.4"/>
                    <Rectangle Width="1" Fill="DarkGray" HorizontalAlignment="Right" Grid.ColumnSpan="2"/>
                    <Rectangle Width="1" Margin="0,0,1,0" Fill="DarkGray" HorizontalAlignment="Right" Grid.ColumnSpan="2"/>
                    <Thumb x:Name="PART_LeftHeaderGripper" HorizontalAlignment="Left" Style="{StaticResource ThumbStyle}"/>
                    <Thumb x:Name="PART_RightHeaderGripper" Grid.Column="1" HorizontalAlignment="Right" Style="{StaticResource ThumbStyle}"/>
                </Grid>
                <ControlTemplate.Triggers>
                    <Trigger Property="IsMouseOver" Value="True">
                        <Setter TargetName="BackgroundBorder" Property="Background" Value="{StaticResource Brush_CorpBlue_T1S1}"/>
                        <Setter TargetName="BackgroundBorder" Property="BorderBrush" Value="{StaticResource ControlHighlightBorderBrush}"/>
                    </Trigger>
                    <Trigger Property="SortDirection" Value="Ascending">
                        <Setter TargetName="SortArrow" Property="Visibility" Value="Visible"/>
                        <Setter TargetName="SortArrow" Property="RenderTransform">
                            <Setter.Value>
                                <RotateTransform Angle="180"/>
                            </Setter.Value>
                        </Setter>
                    </Trigger>
                    <Trigger Property="SortDirection" Value="Descending">
                        <Setter TargetName="SortArrow" Property="Visibility" Value="Visible"/>
                    </Trigger>
                    <Trigger Property="DisplayIndex" Value="0">
                        <Setter TargetName="PART_LeftHeaderGripper" Property="Visibility" Value="Collapsed"/>
                    </Trigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

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