WPF ScrollViewer 与 ScrollBar 自定义样式

该 XAML 代码是一个 WPF 资源字典（ResourceDictionary），核心作用是自定义 ScrollViewer（滚动视图）和 ScrollBar（滚动条）的外观与交互行为，通过样式覆盖默认控件样式，实现统一、个性化的滚动交互效果，无需在每个使用控件的地方重复定义样式，可直接在项目中引用。

• 基础外观：

  • 边框透明（BorderThickness=0，取消默认边框）

  • 内部网格布局：包含 “滚动内容区” 和 “垂直 / 水平滚动条”

• 模板结构（ControlTemplate）：

  • 外层边框（Border）：承载滚动视图的整体容器

  • 内部网格（Grid）：

    1） 滚动的内容（ScrollContentPresenter）：显示滚动的内容（绑定 Cursor、Padding 等属性）

    2） 垂直滚动条（PART_VerticalScrollBar）：右对齐，绑定 for_scrollbar 样式，可见性由内容高度决定（ComputedVerticalScrollBarVisibility）

    3） 水平滚动条（PART_HorizontalScrollBar）：底对齐，同上，可见性由内容宽度决定

• 交互动画（通过 EventTrigger 实现）： 是该样式的核心亮点，实现 “滚动时 / 鼠标 hover 时” 的动态透明度变化，提升交互体验：

触发事件	动画效果	细节
ScrollChanged（滚动时）	滚动条透明度 “0.2→0.8→0.2”	- 先 1 秒内从 0.2 升到 0.8（突出滚动条） - 再 1 秒内从 0.8 降回 0.2（滚动停止后恢复低调）
MouseEnter（鼠标移入滚动条）	透明度 0.2→0.8（0.7 秒过渡）	鼠标靠近时，滚动条变清晰，便于操作
MouseLeave（鼠标移出滚动条）	透明度 0.8→0.2（0.7 秒过渡）	鼠标离开后，滚动条恢复半透明，减少视觉干扰

添加资源字典 ScrollViewerStyle.xaml

点击查看代码

<ResourceDictionary xmlns="<http://schemas.microsoft.com/winfx/2006/xaml/presentation>"
                    xmlns:x="<http://schemas.microsoft.com/winfx/2006/xaml>">
    <!-- ScrollViewer 滚动条 -->
    <Style x:Key="ScrollBarThumb" TargetType="{x:Type Thumb}">
        <Setter Property="OverridesDefaultStyle" Value="true"/>
        <Setter Property="IsTabStop" Value="false"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Thumb}">
                    <Grid>
                        <!--滚动条颜色-->
                        <Border Background="#646465" CornerRadius="3"/>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <Style x:Key="HorizontalScrollBarPageButton" TargetType="{x:Type RepeatButton}">
        <Setter Property="OverridesDefaultStyle" Value="true"/>
        <Setter Property="Background" Value="Transparent"/>
        <Setter Property="Focusable" Value="false"/>
        <Setter Property="IsTabStop" Value="false"/>
        <Setter Property="Opacity" Value="0.2"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type RepeatButton}">
                    <Rectangle Fill="{TemplateBinding Background}" Width="{TemplateBinding Width}" Height="{TemplateBinding Height}"/>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <Style x:Key="VerticalScrollBarPageButton" TargetType="{x:Type RepeatButton}">
        <Setter Property="OverridesDefaultStyle" Value="true"/>
        <Setter Property="Background" Value="Transparent"/>
        <Setter Property="Focusable" Value="false"/>
        <Setter Property="IsTabStop" Value="false"/>
        <Setter Property="Opacity" Value="0.2"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type RepeatButton}">
                    <Rectangle Fill="{TemplateBinding Background}" Width="{TemplateBinding Width}" Height="{TemplateBinding Height}"/>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <!--滚动条上下按钮-->
    <Style x:Key="VerticalScrollBarPageButton2" TargetType="{x:Type RepeatButton}">
        <Setter Property="OverridesDefaultStyle"  Value="true"/>
        <Setter Property="Background" Value="Transparent"/>
        <Setter Property="Focusable" Value="false"/>
        <Setter Property="IsTabStop" Value="false"/>
        <Setter Property="Opacity"  Value="0"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type RepeatButton}">
                    <Rectangle Fill="#90000000" Width="0" Height="0"/>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <Style x:Key="for_scrollbar" TargetType="{x:Type ScrollBar}">
        <Setter Property="Stylus.IsPressAndHoldEnabled" Value="false"/>
        <Setter Property="Stylus.IsFlicksEnabled" Value="false"/>
        <Setter Property="Background" Value="Transparent"/>
        <Setter Property="Margin" Value="0,1,1,6"/>
        <Setter Property="Width"  Value="10"/>
        <Setter Property="MinWidth"  Value="5"/>
        <Setter Property="Opacity"   Value="0.2"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type ScrollBar}">
                    <Grid x:Name="Bg" SnapsToDevicePixels="true">
                        <Grid.RowDefinitions>
                            <RowDefinition Height="auto"></RowDefinition>
                            <RowDefinition Height="*"></RowDefinition>
                            <RowDefinition Height="auto"></RowDefinition>
                        </Grid.RowDefinitions>
                        <RepeatButton  Grid.Row="0" Style="{StaticResource VerticalScrollBarPageButton2}" Command="{x:Static ScrollBar.PageUpCommand}"/>
                        <Track x:Name="PART_Track"   Grid.Row="1" IsEnabled="{TemplateBinding IsMouseOver}" IsDirectionReversed="true">
                            <Track.DecreaseRepeatButton>
                                <RepeatButton Style="{StaticResource VerticalScrollBarPageButton}" Command="{x:Static ScrollBar.PageUpCommand}"/>
                            </Track.DecreaseRepeatButton>
                            <Track.IncreaseRepeatButton>
                                <RepeatButton Style="{StaticResource VerticalScrollBarPageButton}" Command="{x:Static ScrollBar.PageDownCommand}"/>
                            </Track.IncreaseRepeatButton>
                            <Track.Thumb>
                                <Thumb Style="{StaticResource ScrollBarThumb}"/>
                            </Track.Thumb>
                        </Track>
                        <RepeatButton Grid.Row="2" Style="{StaticResource VerticalScrollBarPageButton2}" Command="{x:Static ScrollBar.PageDownCommand}"/>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
        <Style.Triggers>
            <Trigger Property="Orientation" Value="Horizontal">
                <Setter Property="Background"  Value="Transparent"/>
                <Setter Property="Margin" Value="1,0,6,1"/>
                <Setter Property="Height"   Value="5"/>
                <Setter Property="MinHeight"  Value="5"/>
                <Setter Property="Width"    Value="Auto"/>
                <Setter Property="Opacity" Value="0.2"/>
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="{x:Type ScrollBar}">
                            <Grid x:Name="Bg" SnapsToDevicePixels="true">
                                <Track x:Name="PART_Track" IsEnabled="{TemplateBinding IsMouseOver}">
                                    <Track.DecreaseRepeatButton>
                                        <RepeatButton Style="{StaticResource HorizontalScrollBarPageButton}"  Command="{x:Static ScrollBar.PageLeftCommand}"/>
                                    </Track.DecreaseRepeatButton>
                                    <Track.IncreaseRepeatButton>
                                        <RepeatButton Style="{StaticResource HorizontalScrollBarPageButton}"  Command="{x:Static ScrollBar.PageRightCommand}"/>
                                    </Track.IncreaseRepeatButton>
                                    <Track.Thumb>
                                        <Thumb Style="{StaticResource ScrollBarThumb}"/>
                                    </Track.Thumb>
                                </Track>
                            </Grid>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </Trigger>
        </Style.Triggers>
    </Style>
    <Style x:Key="for_scrollviewer"
           TargetType="{x:Type ScrollViewer}">
        <Setter Property="BorderBrush" Value="LightGray"/>
        <Setter Property="BorderThickness" Value="0"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type ScrollViewer}">
                    <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" SnapsToDevicePixels="True">
                        <Grid Background="{TemplateBinding Background}">
                            <ScrollContentPresenter  Cursor="{TemplateBinding Cursor}" Margin="{TemplateBinding Padding}" ContentTemplate="{TemplateBinding ContentTemplate}"/>
                            <ScrollBar x:Name="PART_VerticalScrollBar"
                                       HorizontalAlignment="Right"
                                       Maximum="{TemplateBinding ScrollableHeight}"
                                       Orientation="Vertical"
                                       Style="{StaticResource for_scrollbar}"
                                       ViewportSize="{TemplateBinding ViewportHeight}"
                                       Value="{TemplateBinding VerticalOffset}"
                                       Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}"/>
                            <ScrollBar x:Name="PART_HorizontalScrollBar"
                                       Maximum="{TemplateBinding ScrollableWidth}"
                                       Orientation="Horizontal"
                                       Style="{StaticResource for_scrollbar}"
                                       VerticalAlignment="Bottom"
                                       Value="{TemplateBinding HorizontalOffset}"
                                       ViewportSize="{TemplateBinding ViewportWidth}"
                                       Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}"/>
                        </Grid>
                    </Border>
                    <ControlTemplate.Triggers>
                        <EventTrigger RoutedEvent="ScrollChanged" >
                            <BeginStoryboard>
                                <Storyboard>
                                    <DoubleAnimation
                                        Storyboard.TargetName="PART_VerticalScrollBar"
                                        Storyboard.TargetProperty="Opacity"
                                        To="0.8"
                                        Duration="0:0:1"/>
                                    <DoubleAnimation
                                        Storyboard.TargetName="PART_VerticalScrollBar"
                                        Storyboard.TargetProperty="Opacity"
                                        To="0.2"
                                        Duration="0:0:1"
                                        BeginTime="0:0:1"/>
                                    <DoubleAnimation
                                        Storyboard.TargetName="PART_HorizontalScrollBar"
                                        Storyboard.TargetProperty="Opacity"
                                        To="0.8"
                                        Duration="0:0:1"/>
                                    <DoubleAnimation
                                        Storyboard.TargetName="PART_HorizontalScrollBar"
                                        Storyboard.TargetProperty="Opacity"
                                        To="0.2"
                                        Duration="0:0:1"
                                        BeginTime="0:0:1"/>
                                </Storyboard>
                            </BeginStoryboard>
                        </EventTrigger>
                        <EventTrigger RoutedEvent="MouseEnter"
                                      SourceName="PART_VerticalScrollBar">
                            <BeginStoryboard>
                                <Storyboard>
                                    <DoubleAnimation
                                        Storyboard.TargetName="PART_VerticalScrollBar"
                                        Storyboard.TargetProperty="Opacity"
                                        To="0.8"
                                        Duration="0:0:0.7"/>
                                </Storyboard>
                            </BeginStoryboard>
                        </EventTrigger>
                        <EventTrigger RoutedEvent="MouseLeave"
                                      SourceName="PART_VerticalScrollBar">
                            <BeginStoryboard>
                                <Storyboard>
                                    <DoubleAnimation
                                        Storyboard.TargetName="PART_VerticalScrollBar"
                                        Storyboard.TargetProperty="Opacity"
                                        To="0.2"
                                        Duration="0:0:0.7"/>
                                </Storyboard>
                            </BeginStoryboard>
                        </EventTrigger>
                        <EventTrigger RoutedEvent="MouseEnter"
                                      SourceName="PART_HorizontalScrollBar">
                            <BeginStoryboard>
                                <Storyboard>
                                    <DoubleAnimation
                                        Storyboard.TargetName="PART_HorizontalScrollBar"
                                        Storyboard.TargetProperty="Opacity"
                                        To="0.8"
                                        Duration="0:0:0.7"/>
                                </Storyboard>
                            </BeginStoryboard>
                        </EventTrigger>
                        <EventTrigger RoutedEvent="MouseLeave"
                                      SourceName="PART_HorizontalScrollBar">
                            <BeginStoryboard>
                                <Storyboard>
                                    <DoubleAnimation
                                        Storyboard.TargetName="PART_HorizontalScrollBar"
                                        Storyboard.TargetProperty="Opacity"
                                        To="0.2"
                                        Duration="0:0:0.7"/>
                                </Storyboard>
                            </BeginStoryboard>
                        </EventTrigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <!--默认ScrollBar-->
    <Style TargetType="ScrollBar" BasedOn="{StaticResource for_scrollbar}"/>

    <!--默认ScrollView-->
    <Style TargetType="ScrollViewer" BasedOn="{StaticResource for_scrollviewer}"/>
</ResourceDictionary>

App.xaml 引入对应资源字典

点击查看代码

 <Application.Resources>
     <ResourceDictionary> 
         <ResourceDictionary.MergedDictionaries>
             <!--  ScrollViewer  -->
             <ResourceDictionary Source="pack://application:,,,/WpfMiniaturesDemo;component/ScrollViewerStyle.xaml" />
         </ResourceDictionary.MergedDictionaries>
     </ResourceDictionary>
 </Application.Resources>