如何编辑 ScrollViewer 的滚动条的样式？

Question

我已经知道如何通过编辑其模板的副本来编辑 ScrollViewer 的模板。但是如何编辑 Scrollbar-that's-inside-the-ScrollViewer 的样式？

_{（我想要的是按照this 答案中的建议更改其FadeOut 动画的BeginTime。我不想更改应用程序中所有滚动条的行为。）}

如果有某种方法可以在代码中而不是 XAML 中执行此操作，那就太好了。

Answer 1

首先编辑滚动条的样式模板并将其放置在您的页面资源中 然后使用一个键（“customScrollBar”）来识别这个资源

Here 是要编辑的 ScrollBar 样式模板。

使用适合您的开始时间进行编辑。

<Storyboard>
    <FadeOutThemeAnimation BeginTime="1" TargetName="HorizontalPanningRoot" />
    <FadeOutThemeAnimation BeginTime="1" TargetName="VerticalPanningRoot" />
    <FadeOutThemeAnimation BeginTime="1" TargetName="HorizontalRoot" />
    <FadeOutThemeAnimation BeginTime="1" TargetName="VerticalRoot" />
</Storyboard>

并添加下面的滚动查看器样式

 <Style x:Key="customScrollViewer" TargetType="ScrollViewer">
        <Setter Property="HorizontalScrollMode" Value="Auto" />
        <Setter Property="VerticalScrollMode" Value="Auto" />
        <Setter Property="IsHorizontalRailEnabled" Value="True" />
        <Setter Property="IsVerticalRailEnabled" Value="True" />
        <Setter Property="IsTabStop" Value="False" />
        <Setter Property="ZoomMode" Value="Disabled" />
        <Setter Property="HorizontalContentAlignment" Value="Left" />
        <Setter Property="VerticalContentAlignment" Value="Top" />
        <Setter Property="VerticalScrollBarVisibility" Value="Visible" />
        <Setter Property="Padding" Value="0" />
        <Setter Property="BorderThickness" Value="0" />
        <Setter Property="BorderBrush" Value="Transparent" />
        <Setter Property="Background" Value="Transparent" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="ScrollViewer">
                    <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">
                        <VisualStateManager.VisualStateGroups>
                            <VisualStateGroup x:Name="ScrollingIndicatorStates">
                                <VisualStateGroup.Transitions>
                                    <VisualTransition From="MouseIndicator" To="NoIndicator">
                                        <Storyboard>
                                            <FadeOutThemeAnimation TargetName="ScrollBarSeparator" BeginTime="0:0:3" />
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="VerticalScrollBar"
                                             Storyboard.TargetProperty="IndicatorMode">
                                                <DiscreteObjectKeyFrame KeyTime="0:0:3">
                                                    <DiscreteObjectKeyFrame.Value>
                                                        <ScrollingIndicatorMode>None</ScrollingIndicatorMode>
                                                    </DiscreteObjectKeyFrame.Value>
                                                </DiscreteObjectKeyFrame>
                                            </ObjectAnimationUsingKeyFrames>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="HorizontalScrollBar"
                                             Storyboard.TargetProperty="IndicatorMode">
                                                <DiscreteObjectKeyFrame KeyTime="0:0:3">
                                                    <DiscreteObjectKeyFrame.Value>
                                                        <ScrollingIndicatorMode>None</ScrollingIndicatorMode>
                                                    </DiscreteObjectKeyFrame.Value>
                                                </DiscreteObjectKeyFrame>
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualTransition>
                                    <VisualTransition From="TouchIndicator" To="NoIndicator">
                                        <Storyboard>
                                            <FadeOutThemeAnimation TargetName="ScrollBarSeparator" />
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="VerticalScrollBar"
                                             Storyboard.TargetProperty="IndicatorMode">
                                                <DiscreteObjectKeyFrame KeyTime="0:0:0.5">
                                                    <DiscreteObjectKeyFrame.Value>
                                                        <ScrollingIndicatorMode>None</ScrollingIndicatorMode>
                                                    </DiscreteObjectKeyFrame.Value>
                                                </DiscreteObjectKeyFrame>
                                            </ObjectAnimationUsingKeyFrames>
                                            <ObjectAnimationUsingKeyFrames Storyboard.TargetName="HorizontalScrollBar"
                                             Storyboard.TargetProperty="IndicatorMode">
                                                <DiscreteObjectKeyFrame KeyTime="0:0:0.5">
                                                    <DiscreteObjectKeyFrame.Value>
                                                        <ScrollingIndicatorMode>None</ScrollingIndicatorMode>
                                                    </DiscreteObjectKeyFrame.Value>
                                                </DiscreteObjectKeyFrame>
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualTransition>
                                </VisualStateGroup.Transitions>

                                <VisualState x:Name="NoIndicator">
                                    <Storyboard>
                                        <FadeOutThemeAnimation TargetName="ScrollBarSeparator" />
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="TouchIndicator">
                                    <Storyboard>
                                        <FadeOutThemeAnimation TargetName="ScrollBarSeparator" />
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="VerticalScrollBar"
                                           Storyboard.TargetProperty="IndicatorMode"
                                           Duration="0">
                                            <DiscreteObjectKeyFrame KeyTime="0">
                                                <DiscreteObjectKeyFrame.Value>
                                                    <ScrollingIndicatorMode>TouchIndicator</ScrollingIndicatorMode>
                                                </DiscreteObjectKeyFrame.Value>
                                            </DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="HorizontalScrollBar"
                                           Storyboard.TargetProperty="IndicatorMode"
                                           Duration="0">
                                            <DiscreteObjectKeyFrame KeyTime="0">
                                                <DiscreteObjectKeyFrame.Value>
                                                    <ScrollingIndicatorMode>TouchIndicator</ScrollingIndicatorMode>
                                                </DiscreteObjectKeyFrame.Value>
                                            </DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="MouseIndicator">
                                    <Storyboard>
                                        <FadeInThemeAnimation TargetName="ScrollBarSeparator" />
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="VerticalScrollBar"
                                           Storyboard.TargetProperty="IndicatorMode"
                                           Duration="0">
                                            <DiscreteObjectKeyFrame KeyTime="0">
                                                <DiscreteObjectKeyFrame.Value>
                                                    <ScrollingIndicatorMode>MouseIndicator</ScrollingIndicatorMode>
                                                </DiscreteObjectKeyFrame.Value>
                                            </DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="HorizontalScrollBar"
                                           Storyboard.TargetProperty="IndicatorMode"
                                           Duration="0">
                                            <DiscreteObjectKeyFrame KeyTime="0">
                                                <DiscreteObjectKeyFrame.Value>
                                                    <ScrollingIndicatorMode>MouseIndicator</ScrollingIndicatorMode>
                                                </DiscreteObjectKeyFrame.Value>
                                            </DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                            </VisualStateGroup>
                        </VisualStateManager.VisualStateGroups>
                        <Grid Background="{TemplateBinding Background}">
                            <Grid.ColumnDefinitions>
                                <ColumnDefinition Width="*" />
                                <ColumnDefinition Width="Auto" />
                            </Grid.ColumnDefinitions>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="*" />
                                <RowDefinition Height="Auto" />
                            </Grid.RowDefinitions>
                            <ScrollContentPresenter x:Name="ScrollContentPresenter"
                              Grid.RowSpan="2"
                              Grid.ColumnSpan="2"
                              ContentTemplate="{TemplateBinding ContentTemplate}"
                              Margin="{TemplateBinding Padding}" />
                            <ScrollBar x:Name="VerticalScrollBar" Style="{StaticResource customScrollBar}"
                                                 Grid.Column="1"
                                                 IsTabStop="False"
                                                 Maximum="{TemplateBinding ScrollableHeight}"
                                                 Orientation="Vertical"
                                                 Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}"
                                                 Value="{TemplateBinding VerticalOffset}"
                                                 ViewportSize="{TemplateBinding ViewportHeight}"
                                                 HorizontalAlignment="Right" />
                          <ScrollBar x:Name="HorizontalScrollBar"
                                 IsTabStop="False"
                                 Maximum="{TemplateBinding ScrollableWidth}"
                                 Orientation="Horizontal"
                                 Grid.Row="1"
                                 Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}"
                                 Value="{TemplateBinding HorizontalOffset}"
                                 ViewportSize="{TemplateBinding ViewportWidth}" />
                            <Border x:Name="ScrollBarSeparator"
              Grid.Row="1"
              Grid.Column="1"
              Background="{ThemeResource SystemControlPageBackgroundChromeLowBrush}" />
                        </Grid>
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

请注意我是如何在上面的 ScrollViewer 中添加“customScrollBar”样式的。