如何在 ListBox 中获得垂直滚动条? [英] How can I get a vertical scrollbar in my ListBox?

问题描述

在下面的示例中，我有一个 ListBox，其中包含许多字体名称.

In the example below I have a ListBox with dozens of font names in it.

我原以为它会自动有一个垂直滚动条，这样你就可以选择任何字体，而不仅仅是列表中的第一个字体，但事实并非如此.

I would have thought it would automatically have a vertical scrollbar on it so that you can select ANY font, not just the first ones in the list, but it doesn't.

所以我添加了一个ScrollViewer"，并在右侧放置了一个滚动条区域"，但滚动条区域中没有滚动条，因此您可以滚动(！).

So I added a "ScrollViewer" and that puts a "scrollbar area" on the right but there is no scrollbar in the scrollbar area so that you can scroll (!).

为什么滚动条不是自动的，我如何强制它有滚动条?

Why isn't a scrollbar automatic and how do I force it to have a scrollbar?

<StackPanel Name="stack1">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="2*"></RowDefinition>
            <RowDefinition Height="*"></RowDefinition>
        </Grid.RowDefinitions>
        <ScrollViewer>
            <ListBox Grid.Row="0" Name="lstFonts" Margin="3"  ItemsSource="{x:Static Fonts.SystemFontFamilies}"/>
        </ScrollViewer>
    </Grid>
</StackPanel>

推荐答案

您的解决方案的问题是您在 ListBox 周围放置了一个滚动条，您可能希望将它放在 ListBox 中.

The problem with your solution is you're putting a scrollbar around a ListBox where you probably want to put it inside the ListBox.

如果您想在 ListBox 中强制使用滚动条，请使用 ScrollBar.VerticalScrollBarVisibility 附加属性.

If you want to force a scrollbar in your ListBox, use the ScrollBar.VerticalScrollBarVisibility attached property.

<ListBox 
    ItemsSource="{Binding}" 
    ScrollViewer.VerticalScrollBarVisibility="Visible">
</ListBox>

将此值设置为 Auto 将根据需要弹出滚动条.

Setting this value to Auto will popup the scrollbar on an as needed basis.

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