在页面中心对齐枢轴 Header 个项目

Question

我在我的 UWP 应用程序中使用 Pivot 控件。问题是 Pivot 将其 Header 项目对齐在页面的左侧。是否可以将它们对齐在页面的中心？我已经尝试使用 PivotItemHeader 的自定义样式进行此操作，但没有成功。我的风格如下图。

<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="Gray" />
        <!-- original 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="Segoe UI" />
                                <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="{StaticResource currentThemeColor}" />
                                            <!-- original value {ThemeResource SystemControlHighlightAltBaseHighBrush} -->
                                        </ObjectAnimationUsingKeyFrames>
                                        <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="{ThemeResource SystemControlHighlightAltBaseMediumHighBrush}" />
                                        </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="{ThemeResource SystemControlHighlightAltBaseMediumHighBrush}" />
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="Grid" Storyboard.TargetProperty="Background">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightTransparentBrush}" />
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                            </VisualStateGroup>
                        </VisualStateManager.VisualStateGroups>
                        <ContentPresenter x:Name="ContentPresenter" 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>

Answer 1

如果我没理解错的话，你想将所有 headers 居中。如果是这样，那么您不想更改 PivotHeaderItem、but Pivot's style。在那里你会发现类似 HeaderClipper 的东西，将其默认 HorizontalContentAlignment 从 Stretch 更改为居中，它应该可以工作：

<!-- some code before -->
<ContentControl x:Name="HeaderClipper" Grid.Column="1" HorizontalContentAlignment="Center" UseSystemFocusVisuals="True">
<!-- some code before -->

在页面中心对齐枢轴 Header 个项目

Align Pivot Header items in Center of the Page

xaml

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uwp

uwp-xaml