WPF 从"基于"更改元素属性的值

Question

我有以下风格：

<Style TargetType="{x:Type local:MetroTabControl}">
    <Style.Triggers>
        <Trigger Property="SingleRow" Value="True">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type local:MetroTabControl}">
                        <Grid>
                            <Grid KeyboardNavigation.TabNavigation="Local" SnapsToDevicePixels="True">
                                <Grid.RowDefinitions>
                                    <RowDefinition Height="Auto"/>
                                    <RowDefinition Height="Auto"/>
                                    <RowDefinition Height="*"/>
                                </Grid.RowDefinitions>
                                <Grid>
                                    <ScrollViewer x:Name="ScrollViewer" VerticalScrollBarVisibility="Disabled" HorizontalScrollBarVisibility="Hidden" Style="{DynamicResource TabPanelScrollViewer}">
                                        <TabPanel x:Name="HeaderPanel" IsItemsHost="True" Panel.ZIndex="1" KeyboardNavigation.TabIndex="1"/>
                                    </ScrollViewer>
                                    <Button x:Name="AddTabItem" Content="&#xE109;"  Style="{DynamicResource TabControlButton}" HorizontalAlignment="Right" VerticalAlignment="Top"/>
                                </Grid>
                                <Border Grid.Row="1" x:Name="TabPanelBorder" Background="Transparent">
                                    <Rectangle x:Name="TabPanelBorderRectangle" Fill="{StaticResource TabPanelBorderBrush}" Height="2"/>
                                </Border>
                                <Border Grid.Row="2" Background="{StaticResource TabControlBackground}"/>
                                <ContentPresenter Grid.Row="2" Name="PART_SelectedContentHost" ContentSource="SelectedContent"/>
                            </Grid>
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
            <!--<Setter Property="Template" Value="{StaticResource MetroTabControlSingleRow}" />-->
        </Trigger>
        <Trigger Property="SingleRow" Value="False">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type local:MetroTabControl}">
                        <Grid KeyboardNavigation.TabNavigation="Local" SnapsToDevicePixels="True">
                            <Grid.RowDefinitions>
                                <RowDefinition Height="Auto"/>
                                <RowDefinition Height="*"/>
                            </Grid.RowDefinitions>
                            <Border Background="Transparent" BorderThickness="0,0,0,2"  BorderBrush="{StaticResource TabPanelBorderBrush}">
                                <DockPanel LastChildFill="True">
                                    <Button x:Name="AddTabItem" Style="{DynamicResource TabControlButton}" DockPanel.Dock="Right">
                                        <Path Stroke="{Binding Foreground, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Button}}}" Data="M0,4 H8 M4,0 V8"  StrokeThickness="2" />
                                    </Button>
                                    <TabPanel x:Name="HeaderPanel" IsItemsHost="True" Panel.ZIndex="1" KeyboardNavigation.TabIndex="1"/>
                                </DockPanel>
                            </Border>
                            <Border Grid.Row="1" Background="{StaticResource TabControlBackground}"/>
                            <ContentPresenter Grid.Row="1" Name="PART_SelectedContentHost" ContentSource="SelectedContent"/>
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
            <!--<Setter Property="Template" Value="{StaticResource MetroTabControlMultiRows}" />-->
        </Trigger>
    </Style.Triggers>
</Style>

我想有另一种样式，BasedOn上面，但有一个变化 - 我想更改 TabPanelBorderRectangle Rectangle 的Fill颜色。

因此，为了使用BasedOn，我写了以下内容：

<Style TargetType="{x:Type local:MetroTabControl}" BasedOn="{StaticResource {x:Type local:MetroTabControl}}">
</Style>

但是我不知道如何从BasedOn样式更改TabPanelBorderRectangle Rectangle的颜色。

我尝试了类似的东西

<Setter TargetName="TabPanelBorderRectangle" Property="Fill" Value="Red"/>

但它不起作用（无法在样式资源库上设置目标名称属性）..

我该怎么做？

Answer 1

由于错误状态，您不能在样式资源库中使用TargetName。

作为解决方法，您可以执行的操作是，不要将StaticResource用于画笔，而是使用 DynamicResource 绑定它，以便我们可以利用 XAML 的资源查找行为。

<Rectangle x:Name="TabPanelBorderRectangle"
           Fill="{DynamicResource TabPanelBorderBrush}"/>

现在，在您的样式中，您可以通过为画笔指定相同的键来override that brush，并在那里提供您的颜色值。

<Style TargetType="{x:Type local:MetroTabControl}"
       BasedOn="{StaticResource {x:Type local:MetroTabControl}}">
    <Style.Resources>
         <SolidColorBrush x:Key="TabPanelBorderBrush" Color="Green"/>
    </Style.Resources>
</Style>

由于brush是通过dynamic resource绑定的，它将从您的样式资源中选取most local value，在上述情况下为绿色。