自定义滚动条(Custom ScrollBar)

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阅读导航：

一、先看效果
二、本文背景
三、代码实现
四、文章参考
五、代码下载

一、先看效果

二、本文背景

设计师给的效果图中，滚动条的样式好好看呀，但是手上现有的控件库不好改呀，那我自己重新实现样式吧。

三、代码实现

小编使用.Net Core 3.1创建的WPF工程，创建名称为“ScrollBar”的解决方案后，不添加任何用户控件，直接在MainWindow.xaml文件中开干。

下面是上图显示的窗体标题及滚动视图代码：

<Grid Background="#FF222222"><Grid.RowDefinitions><RowDefinition Height="60"/><RowDefinition Height="*"/></Grid.RowDefinitions><Grid Grid.Row="0"><TextBlock Margin="10" Text="Custom ScrollBar" Foreground="#FFEEEEEE" FontSize="33" FontFamily="Script MT Bold" VerticalAlignment="Center"/></Grid><ScrollViewer Grid.Row="1"><Grid Height="1000"/></ScrollViewer></Grid>

下面是上面未添加样式时代码的效果：

除了标题还看得过去，滚动条丑到爆有木有？下面开始添加样式，即覆盖滚动条默认的样式：

<Window.Resources><ResourceDictionary><Style x:Key="ScrollThumbs" TargetType="{x:Type Thumb}"><Setter Property="Template"><Setter.Value><ControlTemplate><Grid x:Name="Grid"><Rectangle HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Width="Auto"Height="Auto" Fill="Transparent"/><Border x:Name="Rectangle1" CornerRadius="10 0 0 10" HorizontalAlignment="Stretch"VerticalAlignment="Stretch" Width="Auto" Height="Auto"Background="{TemplateBinding Background}"/></Grid><ControlTemplate.Triggers><Trigger Property="Tag" Value="Horizontal"><Setter TargetName="Rectangle1" Property="Width" Value="Auto"/><Setter TargetName="Rectangle1" Property="Height" Value="7"/></Trigger></ControlTemplate.Triggers></ControlTemplate></Setter.Value></Setter></Style><!--SCROLLBARS--><Style x:Key="{x:Type ScrollBar}" TargetType="{x:Type ScrollBar}"><Setter Property="Stylus.IsFlicksEnabled" Value="False"/><Setter Property="Foreground" Value="#AAA8341A"/><Setter Property="Background" Value="DarkGray"/><Setter Property="Width" Value="10"/><Setter Property="Template"><Setter.Value><ControlTemplate TargetType="{x:Type ScrollBar}"><Grid x:Name="GridRoot" Width="12" Background="{x:Null}"><Track x:Name="PART_Track" Grid.Row="0" IsDirectionReversed="True" Focusable="False"><Track.Thumb><Thumb x:Name="Thumb" Background="{TemplateBinding Foreground}"Style="{DynamicResource ScrollThumbs}"/></Track.Thumb><Track.IncreaseRepeatButton><RepeatButton x:Name="PageUp" Command="ScrollBar.PageUpCommand" Opacity="0" Focusable="True"/></Track.IncreaseRepeatButton><Track.DecreaseRepeatButton><RepeatButton x:Name="PageDown" Command="ScrollBar.PageDownCommand" Opacity="0" Focusable="True"/></Track.DecreaseRepeatButton></Track></Grid><ControlTemplate.Triggers><Trigger SourceName="Thumb" Property="IsMouseOver" Value="True"><Setter Value="{DynamicResource ButtonSelectBrush}"TargetName="Thumb" Property="Background"/></Trigger><Trigger SourceName="Thumb" Property="IsDragging" Value="True"><Setter Value="{DynamicResource DarkBrush}"TargetName="Thumb" Property="Background"/></Trigger><Trigger Property="IsEnabled" Value="False"><Setter TargetName="Thumb" Property="Visibility" Value="Collapsed"/></Trigger><Trigger Property="Orientation" Value="Horizontal"><Setter TargetName="GridRoot" Property="LayoutTransform"><Setter.Value><RotateTransform Angle="-90"/></Setter.Value></Setter><Setter TargetName="PART_Track" Property="LayoutTransform"><Setter.Value><RotateTransform Angle="-90"/></Setter.Value></Setter><Setter Property="Width" Value="Auto"/><Setter Property="Height" Value="12"/><Setter TargetName="Thumb" Property="Tag" Value="Horizontal"/><Setter TargetName="PageDown" Property="Command" Value="ScrollBar.PageLeftCommand"/><Setter TargetName="PageUp" Property="Command" Value="ScrollBar.PageRightCommand"/></Trigger></ControlTemplate.Triggers></ControlTemplate></Setter.Value></Setter></Style></ResourceDictionary></Window.Resources>

下面是整个MainWindow.xaml的代码，您直接copy到您的测试工程中就可以用了：

<Window x:Class="ScrollBar.MainWindow"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"xmlns:local="clr-namespace:ScrollBar"mc:Ignorable="d"Title="MainWindow" Height="450" Width="300" ResizeMode="NoResize" WindowStartupLocation="CenterScreen" WindowStyle="None"><Window.Resources><ResourceDictionary><Style x:Key="ScrollThumbs" TargetType="{x:Type Thumb}"><Setter Property="Template"><Setter.Value><ControlTemplate><Grid x:Name="Grid"><Rectangle HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Width="Auto"Height="Auto" Fill="Transparent"/><Border x:Name="Rectangle1" CornerRadius="10 0 0 10" HorizontalAlignment="Stretch"VerticalAlignment="Stretch" Width="Auto" Height="Auto"Background="{TemplateBinding Background}"/></Grid><ControlTemplate.Triggers><Trigger Property="Tag" Value="Horizontal"><Setter TargetName="Rectangle1" Property="Width" Value="Auto"/><Setter TargetName="Rectangle1" Property="Height" Value="7"/></Trigger></ControlTemplate.Triggers></ControlTemplate></Setter.Value></Setter></Style><!--SCROLLBARS--><Style x:Key="{x:Type ScrollBar}" TargetType="{x:Type ScrollBar}"><Setter Property="Stylus.IsFlicksEnabled" Value="False"/><Setter Property="Foreground" Value="#AAA8341A"/><Setter Property="Background" Value="DarkGray"/><Setter Property="Width" Value="10"/><Setter Property="Template"><Setter.Value><ControlTemplate TargetType="{x:Type ScrollBar}"><Grid x:Name="GridRoot" Width="12" Background="{x:Null}"><Track x:Name="PART_Track" Grid.Row="0" IsDirectionReversed="True" Focusable="False"><Track.Thumb><Thumb x:Name="Thumb" Background="{TemplateBinding Foreground}"Style="{DynamicResource ScrollThumbs}"/></Track.Thumb><Track.IncreaseRepeatButton><RepeatButton x:Name="PageUp" Command="ScrollBar.PageUpCommand" Opacity="0" Focusable="True"/></Track.IncreaseRepeatButton><Track.DecreaseRepeatButton><RepeatButton x:Name="PageDown" Command="ScrollBar.PageDownCommand" Opacity="0" Focusable="True"/></Track.DecreaseRepeatButton></Track></Grid><ControlTemplate.Triggers><Trigger SourceName="Thumb" Property="IsMouseOver" Value="True"><Setter Value="{DynamicResource ButtonSelectBrush}"TargetName="Thumb" Property="Background"/></Trigger><Trigger SourceName="Thumb" Property="IsDragging" Value="True"><Setter Value="{DynamicResource DarkBrush}"TargetName="Thumb" Property="Background"/></Trigger><Trigger Property="IsEnabled" Value="False"><Setter TargetName="Thumb" Property="Visibility" Value="Collapsed"/></Trigger><Trigger Property="Orientation" Value="Horizontal"><Setter TargetName="GridRoot" Property="LayoutTransform"><Setter.Value><RotateTransform Angle="-90"/></Setter.Value></Setter><Setter TargetName="PART_Track" Property="LayoutTransform"><Setter.Value><RotateTransform Angle="-90"/></Setter.Value></Setter><Setter Property="Width" Value="Auto"/><Setter Property="Height" Value="12"/><Setter TargetName="Thumb" Property="Tag" Value="Horizontal"/><Setter TargetName="PageDown" Property="Command" Value="ScrollBar.PageLeftCommand"/><Setter TargetName="PageUp" Property="Command" Value="ScrollBar.PageRightCommand"/></Trigger></ControlTemplate.Triggers></ControlTemplate></Setter.Value></Setter></Style></ResourceDictionary></Window.Resources><Grid Background="#FF222222"><Grid.RowDefinitions><RowDefinition Height="60"/><RowDefinition Height="*"/></Grid.RowDefinitions><Grid Grid.Row="0"><TextBlock Margin="10" Text="Custom ScrollBar" Foreground="#FFEEEEEE" FontSize="33" FontFamily="Script MT Bold" VerticalAlignment="Center"/></Grid><ScrollViewer Grid.Row="1"><Grid Height="1000"/></ScrollViewer></Grid>
</Window>