C# WPF：在高度属性设置为“自动”的 ListView 中防止水平滚动条覆盖最后一项

Question

我在 StackPanel 中有一个 WPF ListView，Height="Auto"。它能做我想做的事真是太好了——根据 ListView 中包含的所有项目来改变它的高度。我的 ListView 上也有 Horizo​​ntalScrollBarVisiblity="Auto"，这符合我的需要。

当我的 ListView 的列的整个宽度大于 ListView 控件的宽度时会出现问题（即用户减小窗口和此控件的宽度）。在那种情况下，显然会出现水平滚动条 - 没关系。问题是这个滚动条覆盖了 ListView 项目的最后一个（底部）项目，因此它部分不可见。

没有出现垂直滚动条，这没关系 - 我不想要它。我只想正确计算我的 ListView 高度，因此它会考虑显示的水平滚动条的高度并将其包含在计算中，以便所有项目都完全可见。

Xaml 代码示例：

<ListView Name="lvProcedures" ItemsSource="{Binding Path=Procedures}" SelectionMode="Single">
 <ListView.View>
     <GridView AllowsColumnReorder="False" ColumnHeaderToolTip="Lista zabiegów">
         <GridViewColumn DisplayMemberBinding="{Binding Path=procedure}" Header="A" Width="150" />
         <GridViewColumn DisplayMemberBinding="{Binding Path=location}" Header="B" Width="100" />
         <GridViewColumn DisplayMemberBinding="{Binding Path=material}" Header="C" Width="180" />
         <GridViewColumn DisplayMemberBinding="{Binding Path=other}" Header="D" Width="180" />
         <GridViewColumn DisplayMemberBinding="{Binding Path=description}" Header="E" Width="400" />
     </GridView>
  </ListView.View>
</ListView>

我现在想创建覆盖 MeasureOverride 的用户控件（可能只有 ListView 的派生类？？），但我认为这不是解决如此小但令人恼火的“错误”的好方法，而且它仍然让我难以实施解决方案。

有人可以为这个问题提供一些优雅的解决方案吗？ 任何想法将不胜感激。

Answer 1

@bartivo：我没有得到和你一样的结果——底部的水平滚动条似乎没有遮挡最低的项目。我想知道您是否为 ListView 和 ScrollViewer 使用自定义 ControlTemplate，b/c 默认的 ScrollViewer 模板有两行，第一行中的 ScrollContentPresenter (Height="*") 和第二行中的 Horizo​​ntalScrollBar (Height= "Auto") 从而确保一个不会与另一个重叠。

也许您可以尝试为您的 ListView 和 ScrollViewer 使用这些样式，看看是否仍然存在该问题：

        <SolidColorBrush x:Key="ListBorder" Color="#828790"/>
    <Style x:Key="{x:Static GridView.GridViewScrollViewerStyleKey}" TargetType="{x:Type ScrollViewer}">
        <Setter Property="Focusable" Value="false"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type ScrollViewer}">
                    <Grid SnapsToDevicePixels="true" Background="{TemplateBinding Background}">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="*"/>
                            <ColumnDefinition Width="Auto"/>
                        </Grid.ColumnDefinitions>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="*"/>
                            <RowDefinition Height="Auto"/>
                        </Grid.RowDefinitions>
                        <DockPanel Margin="{TemplateBinding Padding}">
                            <ScrollViewer Focusable="false" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Hidden" DockPanel.Dock="Top">
                                <GridViewHeaderRowPresenter Margin="2,0,2,0" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" AllowsColumnReorder="{Binding TemplatedParent.View.AllowsColumnReorder, RelativeSource={RelativeSource TemplatedParent}}" ColumnHeaderContainerStyle="{Binding TemplatedParent.View.ColumnHeaderContainerStyle, RelativeSource={RelativeSource TemplatedParent}}" ColumnHeaderContextMenu="{Binding TemplatedParent.View.ColumnHeaderContextMenu, RelativeSource={RelativeSource TemplatedParent}}" ColumnHeaderStringFormat="{Binding TemplatedParent.View.ColumnHeaderStringFormat, RelativeSource={RelativeSource TemplatedParent}}" ColumnHeaderTemplate="{Binding TemplatedParent.View.ColumnHeaderTemplate, RelativeSource={RelativeSource TemplatedParent}}" ColumnHeaderTemplateSelector="{Binding TemplatedParent.View.ColumnHeaderTemplateSelector, RelativeSource={RelativeSource TemplatedParent}}" ColumnHeaderToolTip="{Binding TemplatedParent.View.ColumnHeaderToolTip, RelativeSource={RelativeSource TemplatedParent}}" Columns="{Binding TemplatedParent.View.Columns, RelativeSource={RelativeSource TemplatedParent}}"/>
                            </ScrollViewer>
                            <ScrollContentPresenter x:Name="PART_ScrollContentPresenter" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" KeyboardNavigation.DirectionalNavigation="Local" Content="{TemplateBinding Content}" ContentTemplate="{TemplateBinding ContentTemplate}" CanContentScroll="{TemplateBinding CanContentScroll}"/>
                        </DockPanel>
                        <ScrollBar x:Name="PART_HorizontalScrollBar" Cursor="Arrow" Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}" Grid.Row="1" Maximum="{TemplateBinding ScrollableWidth}" Minimum="0.0" Value="{Binding HorizontalOffset, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}" Orientation="Horizontal" ViewportSize="{TemplateBinding ViewportWidth}"/>
                        <ScrollBar x:Name="PART_VerticalScrollBar" Cursor="Arrow" Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}" Grid.Column="1" Maximum="{TemplateBinding ScrollableHeight}" Minimum="0.0" Value="{Binding VerticalOffset, Mode=OneWay, RelativeSource={RelativeSource TemplatedParent}}" Orientation="Vertical" ViewportSize="{TemplateBinding ViewportHeight}"/>
                        <DockPanel Background="{Binding Background, ElementName=PART_VerticalScrollBar}" Grid.Column="1" Grid.Row="1" LastChildFill="false">
                            <Rectangle Fill="White" Width="1" Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}" DockPanel.Dock="Left"/>
                            <Rectangle Fill="White" Height="1" Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}" DockPanel.Dock="Top"/>
                        </DockPanel>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <Style x:Key="ListViewStyle1" TargetType="{x:Type ListView}">
        <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"/>
        <Setter Property="BorderBrush" Value="{StaticResource ListBorder}"/>
        <Setter Property="BorderThickness" Value="1"/>
        <Setter Property="Foreground" Value="#FF042271"/>
        <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
        <Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
        <Setter Property="ScrollViewer.CanContentScroll" Value="true"/>
        <Setter Property="VerticalContentAlignment" Value="Center"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type ListView}">
                    <Microsoft_Windows_Themes:ListBoxChrome x:Name="Bd" SnapsToDevicePixels="true" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" RenderFocused="{TemplateBinding IsKeyboardFocusWithin}" RenderMouseOver="{TemplateBinding IsMouseOver}">
                        <ScrollViewer Style="{DynamicResource {x:Static GridView.GridViewScrollViewerStyleKey}}" Padding="{TemplateBinding Padding}">
                            <ItemsPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                        </ScrollViewer>
                    </Microsoft_Windows_Themes:ListBoxChrome>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsGrouping" Value="true">
                            <Setter Property="ScrollViewer.CanContentScroll" Value="false"/>
                        </Trigger>
                        <Trigger Property="IsEnabled" Value="false">
                            <Setter Property="Background" TargetName="Bd" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>