我已经创建了一个基本的Windows桌面WPF应用程序。在主窗口中,我已将以下内容添加为窗口的主体:
<ScrollViewer Template="{DynamicResource ScrollViewerControlTemplate1}">
<ScrollViewer.Resources>
<ControlTemplate x:Key="ScrollViewerControlTemplate1" TargetType="{x:Type ScrollViewer}">
<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="{DynamicResource {x:Static SystemColors.ControlBrushKey}}" 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}" SmallChange="40000"/>
<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}"/>
</Grid>
</ControlTemplate>
</ScrollViewer.Resources>
<Grid Margin="20">
<Grid.RowDefinitions>
<RowDefinition Height="300"/>
<RowDefinition Height="300"/>
<RowDefinition Height="300"/>
<RowDefinition Height="300"/>
<RowDefinition Height="300"/>
</Grid.RowDefinitions>
<Border Grid.Row="0" Background="SteelBlue"/>
<Border Grid.Row="1" Background="Peru"/>
<Border Grid.Row="2" Background="Goldenrod"/>
<Border Grid.Row="3" Background="Tomato"/>
<Border Grid.Row="4" Background="IndianRed"/>
</Grid>
</ScrollViewer>
您会注意到在PART_VerticalScrollbar上,我设置了SmallChange="40000"(一个任意大的数字)。然而,当我点击滚动条上的向上/向下箭头时,它所做的改变非常小,就像在设置SmallChange之前一样。 我已经多次阅读了文档,但无法弄清楚为什么这对ScrollViewer滚动的数量没有任何影响。有什么想法吗?请注意,我可以更改ScrollBar模板并将这些按钮调用的命令更改为ScrollBar.PageUpCommand而不是ScrollBar.LineUpCommand,但最终我希望比整个页面更好地控制滚动。