当ScrollBar可见时,WPF ScrollViewer显示边框可以通过设置相关样式来实现。以下是一个简单的示例:
<Style TargetType="{x:Type ScrollViewer}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ScrollViewer}">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Rectangle Grid.Column="1" Grid.Row="1" Fill="Black" Width="1" Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}"/>
<Rectangle Grid.Column="0" Grid.Row="1" Fill="Black" Height="1" Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}"/>
<ScrollContentPresenter Grid.Column="0" Grid.Row="0" Content="{TemplateBinding Content}" ContentTemplate="{TemplateBinding ContentTemplate}"/>
<ScrollBar Grid.Column="1" Grid.Row="0" Name="PART_VerticalScrollBar" Orientation="Vertical" Maximum="{TemplateBinding ScrollableHeight}" ViewportSize="{TemplateBinding ViewportHeight}" Value="{TemplateBinding VerticalOffset}" Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}"/>
<ScrollBar Grid.Column="0" Grid.Row="1" Name="PART_HorizontalScrollBar" Orientation="Horizontal" Maximum="{TemplateBinding ScrollableWidth}" ViewportSize="{TemplateBinding ViewportWidth}" Value="{TemplateBinding HorizontalOffset}" Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Window.Resources>
在这个示例中,我们使用了一个Grid来显示边框,并将其可见性设置为ScrollBar的可见性。这样,当ScrollBar可见时,边框也会显示出来。
需要注意的是,这个示例仅仅是一个简单的示例,实际应用中可能需要更复杂的样式和逻辑来实现更好的效果。
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