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wpf之自定义滚动条
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原文:wpf之自定义滚动条
首先我们添加一个带滚动条的textbox控件：
<ScrollViewer Height="130" Width="620" VerticalScrollBarVisibility="Auto" Style="{StaticResource for_scrollviewer}">
<TextBlock xml:space="preserve" Name="FtpServerConf" HorizontalAlignment="Left" VerticalAlignment="Top" TextWrapping="Wrap" Width="610"/>
</ScrollViewer>
这里 VerticalScrollBarVisibility="Auto"表示是超出垂直距离自动显示滚动条，当然这个滚动条是win系统自带的效果，我们要修改的就是这部分，需要对滚动区域的模板进行自定义修改。
这里借用网上的两张图，解释一下滚动条的结构：
我们需要给scrollview控件自定义样式：
<Style x:Key="for_scrollviewer"
TargetType="{x:Type ScrollViewer}">
<Setter Property="BorderBrush"
Value="LightGray"/>
<Setter Property="BorderThickness"
Value="0"/>
<Setter Property="HorizontalContentAlignment"
Value="Left"/>
<Setter Property="HorizontalScrollBarVisibility"
Value="Disabled"/>
<Setter Property="VerticalContentAlignment"
Value="Top"/>
<Setter Property="VerticalScrollBarVisibility"
Value="Visible"/>
<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}"/>
<!--垂直滚动条-->
<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}"/>
<!--水平滚动条-->
<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="1"
Duration="0:0:1"/>
<!--自动消失-->
<!--<DoubleAnimation
Storyboard.TargetName="PART_VerticalScrollBar"
Storyboard.TargetProperty="Opacity"
To="0"
Duration="0:0:1"
BeginTime="0:0:1"/>-->
<DoubleAnimation
Storyboard.TargetName="PART_HorizontalScrollBar"
Storyboard.TargetProperty="Opacity"
To="1"
Duration="0:0:1"/>
<DoubleAnimation
Storyboard.TargetName="PART_HorizontalScrollBar"
Storyboard.TargetProperty="Opacity"
To="0"
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="1"
Duration="0:0:1"/>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
<!---鼠标离开后渐渐消失-->
<!--
<EventTrigger RoutedEvent="MouseLeave"
SourceName="PART_VerticalScrollBar">
<BeginStoryboard>
<Storyboard>
<DoubleAnimation
Storyboard.TargetName="PART_VerticalScrollBar"
Storyboard.TargetProperty="Opacity"
To="0"
Duration="0:0:1"/>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
-->
<EventTrigger RoutedEvent="MouseEnter"
SourceName="PART_HorizontalScrollBar">
<BeginStoryboard>
<Storyboard>
<DoubleAnimation
Storyboard.TargetName="PART_HorizontalScrollBar"
Storyboard.TargetProperty="Opacity"
To="1"
Duration="0:0:1"/>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
<EventTrigger RoutedEvent="MouseLeave"
SourceName="PART_HorizontalScrollBar">
<BeginStoryboard>
<Storyboard>
<DoubleAnimation
Storyboard.TargetName="PART_HorizontalScrollBar"
Storyboard.TargetProperty="Opacity"
To="0"
Duration="0:0:1"/>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
然后在需要使用的地方进行引用：
<ScrollViewer Height="130" Width="620" VerticalScrollBarVisibility="Auto" Style="{StaticResource for_scrollviewer}">
<TextBlock xml:space="preserve" Name="FtpServerConf" HorizontalAlignment="Left" VerticalAlignment="Top" TextWrapping="Wrap" Style="{StaticResource tab_text}" Width="610"></TextBlock>
</ScrollViewer>
最终效果是这样的：
