1. 控件概述
WPF原生滚动条样式较为简单，本样式提供了以下增强功能：
- 现代化外观：简洁的滚动条设计
- 平滑动画效果：鼠标悬停/滚动时渐变显示
- 完全可定制：可调整颜色、大小等参数
- 高性能：优化渲染性能
技术特性对比
| 特性 |
原生ScrollBar |
本样式 |
| 动画效果 |
无 |
悬停/滚动动画 |
| 定制能力 |
有限 |
完全可定制 |
| 性能优化 |
一般 |
高度优化 |
| 视觉一致性 |
系统默认 |
现代化设计 |
2. 核心特性
主要功能
- 渐隐效果：非活动时自动半透明
- 悬停高亮：鼠标悬停时完全显示
- 紧凑设计：默认宽度仅10px
- 双轴支持：同时支持水平和垂直滚动条
可配置参数
| 参数 |
类型 |
默认值 |
描述 |
| 滚动条宽度 |
double |
10px |
垂直滚动条宽度 |
| 滚动条高度 |
double |
5px |
水平滚动条高度 |
| 不透明度 |
double |
0.2 |
非活动时透明度 |
| 高亮不透明度 |
double |
0.8 |
悬停/活动时透明度 |
| 滚动条颜色 |
Brush |
#646465 |
滚动条滑块颜色 |
3. 完整样式代码
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<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>
<Border Background="#646465" CornerRadius="2" Width="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>
<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>
<Style TargetType="ScrollBar" BasedOn="{StaticResource for_scrollbar}"/>
<Style TargetType="ScrollViewer" BasedOn="{StaticResource for_scrollviewer}"/>
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