在C# WPF下自定義滾動條ScrollViewer樣式的操作

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一、實現對ScrollViewer樣式的自定義主要包括：

1、滾動條寬度設置

2、滾動條顏色

3、滾動條圓角

4、滾動條拉動時的效果mouseover

二、實現效果：

三、實現方法

1、創建資源字典（ ResourceDictionary）文件

由於style代碼比較多，之間在控件文件中加載style比較混亂，也不利於其它窗口復用，這裡單獨創建瞭ScrollViewDictionary.xaml文件代碼如下：

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
          xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <ControlTemplate x:Key="MyScrollViewer" TargetType="{x:Type ScrollViewer}">
    <!--View區域背景色-->
    <Grid x:Name="Grid" Background="{TemplateBinding Background}">
      <Grid.ColumnDefinitions>
        <ColumnDefinition Width="*"/>
        <ColumnDefinition Width="Auto"/>
      </Grid.ColumnDefinitions>
      <Grid.RowDefinitions>
        <RowDefinition Height="*"/>
        <RowDefinition Height="Auto"/>
      </Grid.RowDefinitions>
      <Rectangle x:Name="Corner" Grid.Column="1" Fill="White" Grid.Row="1"/>
      <ScrollContentPresenter x:Name="PART_ScrollContentPresenter" CanContentScroll="{TemplateBinding CanContentScroll}" CanHorizontallyScroll="False" CanVerticallyScroll="False" ContentTemplate="{TemplateBinding ContentTemplate}" Content="{TemplateBinding Content}" Grid.Column="0" Margin="{TemplateBinding Padding}" Grid.Row="0"/>
      <ScrollBar x:Name="PART_VerticalScrollBar" AutomationProperties.AutomationId="VerticalScrollBar" Cursor="Arrow" Grid.Column="1" Maximum="{TemplateBinding ScrollableHeight}" Minimum="0" Grid.Row="0" Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}" Value="{Binding VerticalOffset, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}" ViewportSize="{TemplateBinding ViewportHeight}" Style="{DynamicResource MyScrollBarStyle}"/>
      <ScrollBar x:Name="PART_HorizontalScrollBar" AutomationProperties.AutomationId="HorizontalScrollBar" Cursor="Arrow" Grid.Column="0" Maximum="{TemplateBinding ScrollableWidth}" Minimum="0" Orientation="Horizontal" Grid.Row="1" Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}" Value="{Binding HorizontalOffset, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}" ViewportSize="{TemplateBinding ViewportWidth}" Style="{DynamicResource MyScrollBarStyle}"/>
    </Grid>
  </ControlTemplate>
 
  
  <SolidColorBrush x:Key="ScrollBarDisabledBackground" Color="#F4F4F4"/>
 
  <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="Template">
      <Setter.Value>
        <ControlTemplate TargetType="{x:Type RepeatButton}">
          <Rectangle Fill="{TemplateBinding Background}" Height="{TemplateBinding Height}" Width="{TemplateBinding Width}"/>
        </ControlTemplate>
      </Setter.Value>
    </Setter>
  </Style>
  <!--滾動條顏色、圓角等設置-->
  <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}">
          <!--滾動條顏色和圓角設置-->
          <Rectangle Name="thumbRect" Fill="#03ffea" RadiusX="3" RadiusY="3"/>
          <!--鼠標拉動滾動條時的顏色-->
          <ControlTemplate.Triggers>
            <Trigger Property="IsMouseOver" Value="True">
              <Setter Property="Fill" Value="CornflowerBlue" TargetName="thumbRect" />
            </Trigger>
          </ControlTemplate.Triggers>
        </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="Template">
      <Setter.Value>
        <ControlTemplate TargetType="{x:Type RepeatButton}">
          <Rectangle Fill="{TemplateBinding Background}" Height="{TemplateBinding Height}" Width="{TemplateBinding Width}"/>
        </ControlTemplate>
      </Setter.Value>
    </Setter>
  </Style>
  <Style x:Key="MyScrollBarStyle" TargetType="{x:Type ScrollBar}">
    <Setter Property="Background" Value="AliceBlue"/>
    <Setter Property="Stylus.IsPressAndHoldEnabled" Value="false"/>
    <Setter Property="Stylus.IsFlicksEnabled" Value="false"/>
<!--滾動條寬度-->
    <Setter Property="Width" Value="8"/>
    <Setter Property="MinWidth" Value="6"/>
    <Setter Property="Template">
      <Setter.Value>
        <ControlTemplate TargetType="{x:Type ScrollBar}">
          <!--滾動條背景色--> 
          <Grid x:Name="Bg" Background="#001f55" SnapsToDevicePixels="true" Width="8">
            <Grid.RowDefinitions>
              <RowDefinition />
            </Grid.RowDefinitions>
            <Track x:Name="PART_Track" IsDirectionReversed="true" IsEnabled="{TemplateBinding IsMouseOver}">
              <Track.DecreaseRepeatButton>
                <RepeatButton Command="{x:Static ScrollBar.PageUpCommand}" Style="{StaticResource VerticalScrollBarPageButton}"/>
              </Track.DecreaseRepeatButton>
              <Track.IncreaseRepeatButton>
                <RepeatButton Command="{x:Static ScrollBar.PageDownCommand}" Style="{StaticResource VerticalScrollBarPageButton}"/>
              </Track.IncreaseRepeatButton>
              <Track.Thumb>
                <Thumb Style="{StaticResource ScrollBarThumb}"/>
              </Track.Thumb>
            </Track>
          </Grid>
          <ControlTemplate.Triggers>
            <Trigger Property="IsEnabled" Value="false">
              <Setter Property="Background" TargetName="Bg" Value="{StaticResource ScrollBarDisabledBackground}"/>
            </Trigger>
          </ControlTemplate.Triggers>
        </ControlTemplate>
      </Setter.Value>
    </Setter>
    <Style.Triggers>
      <Trigger Property="Orientation" Value="Horizontal">
        <Setter Property="Width" Value="Auto"/>
        <Setter Property="MinWidth" Value="0"/>
        <Setter Property="Height" Value="6"/>
        <Setter Property="MinHeight" Value="6"/>
        <Setter Property="Background" Value="AliceBlue"/>
        <Setter Property="Template">
          <Setter.Value>
            <ControlTemplate TargetType="{x:Type ScrollBar}">
              <Grid x:Name="Bg" Background="Red" SnapsToDevicePixels="true">
                <Grid.ColumnDefinitions>
                  <ColumnDefinition />
                </Grid.ColumnDefinitions>
                <Track x:Name="PART_Track" IsEnabled="{TemplateBinding IsMouseOver}">
                  <Track.DecreaseRepeatButton>
                    <RepeatButton Command="{x:Static ScrollBar.PageLeftCommand}" Style="{StaticResource HorizontalScrollBarPageButton}"/>
                  </Track.DecreaseRepeatButton>
                  <Track.IncreaseRepeatButton>
                    <RepeatButton Command="{x:Static ScrollBar.PageRightCommand}" Style="{StaticResource HorizontalScrollBarPageButton}"/>
                  </Track.IncreaseRepeatButton>
                  <Track.Thumb>
                    <Thumb Style="{StaticResource ScrollBarThumb}" />
                  </Track.Thumb>
                </Track>
              </Grid>
              <ControlTemplate.Triggers>
                <Trigger Property="IsEnabled" Value="false">
                  <Setter Property="Background" TargetName="Bg" Value="{StaticResource ScrollBarDisabledBackground}"/>
                </Trigger>
              </ControlTemplate.Triggers>
            </ControlTemplate>
          </Setter.Value>
        </Setter>
      </Trigger>
    </Style.Triggers>
  </Style>
</ResourceDictionary>

2、在窗口中引用資源字典

<Window.Resources>
    <ResourceDictionary>
      <ResourceDictionary.MergedDictionaries>
        <ResourceDictionary Source="ScrollViewDictionary.xaml" />
      </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>    
  </Window.Resources>

3、scrollViewer中使用新樣式

 <ScrollViewer Template="{StaticResource MyScrollViewer}" Grid.Column="0" Grid.Row="1" VerticalAlignment="Top" Grid.ColumnSpan="2" x:Name="scrList" Margin="0" VerticalScrollBarVisibility="Auto" Height="350" Width="250">
      <StackPanel Orientation="Vertical" Name="layerList" ScrollViewer.VerticalScrollBarVisibility="Visible" Width="250" >
      </StackPanel>
    </ScrollViewer>

自定義完成，以上是所有步驟和代碼，可以根據自己程序的整體設計來更改顏色、寬度、圓角等效果。

以上為個人經驗，希望能給大傢一個參考，也希望大傢多多支持WalkonNet。如有錯誤或未考慮完全的地方，望不吝賜教。

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