WPF 自定义滚动条（ScrollView、ScrollBar）样式

时间：2022-08-10 19:45:35

一、滚动条基本样式

本次修改Scrollview及ScrollBar滚动条样式是通过纯样式实现的。修改的内容包含滚动条的颜色，上下按钮的隐藏。另外添加了鼠标经过滚动条动画。

style样式如下：

<!-- 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}"/>

修改之后的滚动条是影响全局的。

样式应用之后的效果如下：

WPF 自定义滚动条（ScrollView、ScrollBar）样式

引用示例：

<ScrollViewer Margin="10" Height="200" Width="100" BorderBrush="Gray" BorderThickness="1">

        <StackPanel Orientation="Vertical">

              <TextBlock Text="测试一"/>

              <TextBlock Text="测试一"/>

              <TextBlock Text="测试一"/>

              <TextBlock Text="测试一"/>

              <TextBlock Text="测试一"/>

              <TextBlock Text="测试一"/>

              <TextBlock Text="测试一"/>

              <TextBlock Text="测试一"/>

              <TextBlock Text="测试一"/>

              <TextBlock Text="测试一"/>

              <TextBlock Text="测试一"/>

              <TextBlock Text="测试一"/>

              <TextBlock Text="测试一"/>

              <TextBlock Text="测试一"/>

              <TextBlock Text="测试一"/>

              <TextBlock Text="测试一"/>

              <TextBlock Text="测试一"/>

              <TextBlock Text="测试一"/>

              <TextBlock Text="测试一"/>

         </StackPanel>

 </ScrollViewer>

所有代码已经上传到github：https://github.com/cmfGit/WpfDemo.git

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