带有复选框的 WPF 组合框和带有搜索字段的文本框在滚动时显示文本框

Question

如何在组合框中的弹出框滚动时显示文本框控件，这是WPF ComboBox with checkboxes and textbox with search field的延续

我还想在文本框和绑定的组合框项目之间显示一个行间距

<Popup 
Name="Popup"
Placement="Bottom"                        
AllowsTransparency="True" 
Focusable="False"  IsOpen="{TemplateBinding IsDropDownOpen}"
PopupAnimation="Slide">
<Grid 
    Name="DropDown"
    SnapsToDevicePixels="True"  
    MinWidth="{TemplateBinding ActualWidth}"
    MaxHeight="{TemplateBinding MaxDropDownHeight}">
    <Border 
        x:Name="DropDownBorder"
        BorderThickness="1" Background="White"
        BorderBrush="Black"/>
    <ScrollViewer Margin="4,6,4,6" SnapsToDevicePixels="True" DataContext="{Binding}">
        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto" />
                <RowDefinition Height="*" />
            </Grid.RowDefinitions>
            <TextBox />
            <StackPanel Grid.Row="1" IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Contained" />
        </Grid>
    </ScrollViewer>
</Grid>

Answer 1

尝试将ScrollViewer 放在与Grid 相同的Grid 中，但放在另一行中，例如：

<Popup 
    Name="Popup"
    Placement="Bottom"                        
    AllowsTransparency="True" 
    Focusable="False"  IsOpen="{TemplateBinding IsDropDownOpen}"
    PopupAnimation="Slide">
    <Grid 
        Name="DropDown"
        SnapsToDevicePixels="True"  
        MinWidth="{TemplateBinding ActualWidth}"
        MaxHeight="{TemplateBinding MaxDropDownHeight}">
        <Border 
            x:Name="DropDownBorder"
            BorderThickness="1" Background="White"
            BorderBrush="Black"/>
        <Grid Margin="4,6,4,6" SnapsToDevicePixels="True" DataContext="{Binding}">
            <Grid.RowDefinitions>
                <RowDefinition Height="Auto" />
                <RowDefinition Height="*" />
            </Grid.RowDefinitions>
            <TextBox />
            <ScrollViewer Grid.Row="1">
                <StackPanel IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Contained" />
            </ScrollViewer>
        </Grid>
    </Grid>
</Popup>