WPF 自定义滚动条样式

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" >
    <ResourceDictionary.MergedDictionaries>

    </ResourceDictionary.MergedDictionaries>


    <!-- 滚动条滑块 -->
    <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>
                        <!--滚动条滑块颜色-->
                        <Border Background="#FF898989" CornerRadius="3"/>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <!-- 滚动条滑块上下空白区域 -->
    <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>

    <!-- 滚动条滑块左右空白区域 -->
    <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>

    <!-- 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="0.2"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type RepeatButton}">
                    <Rectangle Fill="#90000000" Width="0" Height="0"/>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

    <!-- 滚动条完整 -->
    <Style x:Key="for_scrollbar" TargetType="{x:Type ScrollBar}">
        <Setter Property="Stylus.IsPressAndHoldEnabled" Value="false"/>
        <Setter Property="Stylus.IsFlicksEnabled" Value="false"/>
        <Setter Property="Margin" Value="0,2,0,2"/>
        <Setter Property="Width" Value="6"/>
        <Setter Property="MinWidth" Value="6"/>
        <Setter Property="Opacity" Value="1"/>
        <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="{DynamicResource VerticalScrollBarPageButton2}" Command="{x:Static ScrollBar.PageUpCommand}"/>
                        <Track x:Name="PART_Track"   Grid.Row="1" IsEnabled="{TemplateBinding IsMouseOver}" IsDirectionReversed="true">
                            <Track.DecreaseRepeatButton>
                                <RepeatButton Style="{DynamicResource VerticalScrollBarPageButton}" Command="{x:Static ScrollBar.PageUpCommand}"/>
                            </Track.DecreaseRepeatButton>
                            <Track.IncreaseRepeatButton>
                                <RepeatButton Style="{DynamicResource VerticalScrollBarPageButton}" Command="{x:Static ScrollBar.PageDownCommand}"/>
                            </Track.IncreaseRepeatButton>
                            <Track.Thumb>
                                <Thumb Style="{DynamicResource ScrollBarThumb}"/>
                            </Track.Thumb>
                        </Track>
                        <RepeatButton Grid.Row="2" Style="{DynamicResource 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="2,0,2,0"/>
                <Setter Property="Height"   Value="6"/>
                <Setter Property="MinHeight"  Value="6"/>
                <Setter Property="Width"    Value="Auto"/>
                <Setter Property="Opacity" Value="1"/>
                <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>

    <!-- 滚动条 -->
    <Style x:Key="ScrollViewerBaseStyle" TargetType="{x:Type ScrollViewer}" BasedOn="{StaticResource BaseStyle}" >
        <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>
                            <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}">
                            </ScrollBar>
                        </Grid>
                    </Border>
                    <ControlTemplate.Triggers>
                        <EventTrigger RoutedEvent="MouseEnter">
                            <BeginStoryboard>
                                <Storyboard>
                                    <DoubleAnimation
                                        Storyboard.TargetName="PART_VerticalScrollBar"
                                        Storyboard.TargetProperty="Opacity" To="1" Duration="0:0:0.1"/>
                                    <DoubleAnimation
                                        Storyboard.TargetName="PART_HorizontalScrollBar"
                                        Storyboard.TargetProperty="Opacity" To="1" Duration="0:0:0.1"/>
                                </Storyboard>
                            </BeginStoryboard>
                        </EventTrigger>
                        <EventTrigger RoutedEvent="MouseLeave">
                            <BeginStoryboard>
                                <Storyboard>
                                    <DoubleAnimation
                                        Storyboard.TargetName="PART_VerticalScrollBar"
                                        Storyboard.TargetProperty="Opacity" To="0" Duration="0:0:0.1"/>
                                    <DoubleAnimation
                                        Storyboard.TargetName="PART_HorizontalScrollBar"
                                        Storyboard.TargetProperty="Opacity" To="0" Duration="0:0:0.1"/>
                                </Storyboard>
                            </BeginStoryboard>
                        </EventTrigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    
</ResourceDictionary>