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如何通过挂钩到PanelHeaderItem 模板使用的相同状态来更改 TextBlock 的视觉状态？

代码示例：

<Pivot>
    <Pivot.HeaderTemplate>
        <DataTemplate>
            <Grid>
                <VisualStateManager.VisualStateGroups>
                    <VisualStateGroup x:Name="SelectionStates">
                        <VisualState x:Name="Selected">
                            <Storyboard>
                                <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Text" Storyboard.TargetProperty="Opacity" >
                                    <DiscreteObjectKeyFrame KeyTime="0" Value="1" />
                                </ObjectAnimationUsingKeyFrames>
                            </Storyboard>
                        </VisualState>
                    </VisualStateGroup>
                </VisualStateManager.VisualStateGroups>

                <TextBlock x:Key="Text" Text="{Binding}" Opacity="0.5" />
            </Grid>
        </DataTemplate>
    </Pivot.HeaderTemplate>
</Pivot>

该标记是我尝试使用PanelHeaderItem 模板VisualStateManager.VisualStateGroups中使用的相同 VisualStates 更改 TextBlock 状态的失败尝试。如果有办法从PanelHeaderItem中定位 TextBlock ，那也可以，但我不知道如何。VisualStateManager.VisualStateGroups

理想情况下，寻找一种纯 XAML 方式来执行此操作（无 C#）。

4

1 回答 1

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要更改 Textblock 的属性，您可以在绑定中使用RelativeSource 。<TextBlock Text="{Binding Header}" Opacity="{Binding RelativeSource={RelativeSource TemplatedParent},Path=Opacity}"/>在此绑定中，我将 ContentPresenter Opacity 绑定到 Textblock Opacity。

<Pivot>
    <Pivot.HeaderTemplate>
        <DataTemplate>
            <Grid>
              <TextBlock Text="{Binding Header}" Opacity="{Binding RelativeSource={RelativeSource TemplatedParent},Path=Opacity}"/>
              </Grid>
          </DataTemplate>
    </Pivot.HeaderTemplate>
....
</Pivot>

在下面的 PivotHeader 样式中，我将 Opacity 更改为 1 并将 Forground 更改为 RedSelected VisualState

<VisualState x:Name="Selected">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
                                               Storyboard.TargetProperty="Foreground" >
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="Red" />
                                            </ObjectAnimationUsingKeyFrames>
                                            <DoubleAnimation Storyboard.TargetName="ContentPresenter"
                                     Storyboard.TargetProperty="(UIElement.Opacity)"
                                     Duration="0" To="1" />
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Grid"
                                               Storyboard.TargetProperty="Background" >
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightTransparentBrush}" />
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>

   <Style TargetType="PivotHeaderItem">
            <Setter Property="FontSize" Value="{ThemeResource PivotHeaderItemFontSize}" />
            <Setter Property="FontFamily" Value="{ThemeResource PivotHeaderItemFontFamily}" />
            <Setter Property="FontWeight" Value="{ThemeResource PivotHeaderItemThemeFontWeight}" />
            <Setter Property="CharacterSpacing" Value="{ThemeResource PivotHeaderItemCharacterSpacing}" />
            <Setter Property="Background" Value="Transparent" />
            <Setter Property="Foreground" Value="{ThemeResource SystemControlForegroundBaseMediumBrush}" />
            <Setter Property="Padding" Value="{ThemeResource PivotHeaderItemMargin}" />
            <Setter Property="Height" Value="48" />
            <Setter Property="VerticalContentAlignment" Value="Center" />
            <Setter Property="IsTabStop" Value="False" />
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="PivotHeaderItem">
                        <Grid
          x:Name="Grid"
          Background="{TemplateBinding Background}">
                            <Grid.Resources>
                                <Style x:Key="BaseContentPresenterStyle" TargetType="ContentPresenter">
                                    <Setter Property="FontFamily" Value="XamlAutoFontFamily"/>
                                    <Setter Property="FontWeight" Value="SemiBold"/>
                                    <Setter Property="FontSize" Value="15"/>
                                    <Setter Property="TextWrapping" Value="Wrap"/>
                                    <Setter Property="LineStackingStrategy" Value="MaxHeight"/>
                                    <Setter Property="TextLineBounds" Value="Full"/>
                                    <Setter Property="OpticalMarginAlignment" Value="TrimSideBearings"/>
                                </Style>
                                <Style x:Key="BodyContentPresenterStyle" TargetType="ContentPresenter" BasedOn="{StaticResource BaseContentPresenterStyle}">
                                    <Setter Property="FontFamily" Value="{ThemeResource PivotHeaderItemFontFamily}" />
                                    <Setter Property="FontWeight" Value="{ThemeResource PivotHeaderItemThemeFontWeight}"/>
                                    <Setter Property="FontSize" Value="{ThemeResource PivotHeaderItemFontSize}"/>
                                </Style>
                            </Grid.Resources>
                            <VisualStateManager.VisualStateGroups>
                                <VisualStateGroup x:Name="SelectionStates">
                                    <VisualStateGroup.Transitions>
                                        <VisualTransition From="Unselected" To="UnselectedLocked" GeneratedDuration="0:0:0.33" />
                                        <VisualTransition From="UnselectedLocked" To="Unselected" GeneratedDuration="0:0:0.33" />
                                    </VisualStateGroup.Transitions>
                                    <VisualState x:Name="Disabled">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
                                               Storyboard.TargetProperty="Foreground" >
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlDisabledBaseMediumLowBrush}" />
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="Unselected" />
                                    <VisualState x:Name="UnselectedLocked">
                                        <Storyboard>
                                            <DoubleAnimation Storyboard.TargetName="ContentPresenterTranslateTransform"
                                 Storyboard.TargetProperty="X"
                                 Duration="0" To="{ThemeResource PivotHeaderItemLockedTranslation}" />
                                            <DoubleAnimation Storyboard.TargetName="ContentPresenter"
                                 Storyboard.TargetProperty="(UIElement.Opacity)"
                                 Duration="0" To="0" />
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="Selected">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
                                               Storyboard.TargetProperty="Foreground" >
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="Red" />
                                            </ObjectAnimationUsingKeyFrames>
                                            <DoubleAnimation Storyboard.TargetName="ContentPresenter"
                                     Storyboard.TargetProperty="(UIElement.Opacity)"
                                     Duration="0" To="1" />
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Grid"
                                               Storyboard.TargetProperty="Background" >
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightTransparentBrush}" />
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="UnselectedPointerOver">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
                                               Storyboard.TargetProperty="Foreground" >
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseMediumHighBrush}" />
                                            </ObjectAnimationUsingKeyFrames>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Grid"
                                               Storyboard.TargetProperty="Background" >
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightTransparentBrush}" />
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="SelectedPointerOver">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
                                                Storyboard.TargetProperty="Foreground" >
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="Red" />
                                            </ObjectAnimationUsingKeyFrames>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Grid"
                                               Storyboard.TargetProperty="Background" >
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightTransparentBrush}" />
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="UnselectedPressed">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
                                               Storyboard.TargetProperty="Foreground" >
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseMediumHighBrush}" />
                                            </ObjectAnimationUsingKeyFrames>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Grid"
                                               Storyboard.TargetProperty="Background" >
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightTransparentBrush}" />
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="SelectedPressed">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
                                               Storyboard.TargetProperty="Foreground" >
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="Red" />
                                            </ObjectAnimationUsingKeyFrames>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Grid"
                                               Storyboard.TargetProperty="Background" >
                                                <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightTransparentBrush}" />
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                </VisualStateGroup>
                            </VisualStateManager.VisualStateGroups>
                            <ContentPresenter
            x:Name="ContentPresenter" Opacity="0.5"
            Content="{TemplateBinding Content}"
            ContentTemplate="{TemplateBinding ContentTemplate}"
            Margin="{TemplateBinding Padding}"
            FontSize="{TemplateBinding FontSize}"
            FontFamily="{TemplateBinding FontFamily}"
            FontWeight="{TemplateBinding FontWeight}"
            HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
            VerticalAlignment="{TemplateBinding VerticalContentAlignment}">
                                <ContentPresenter.RenderTransform>
                                    <TranslateTransform x:Name="ContentPresenterTranslateTransform" />
                                </ContentPresenter.RenderTransform>
                            </ContentPresenter>
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
于 2016-04-21T06:48:11.290 回答