Question

我正在使用WPF，我遇到问题，如果ListBoxItem非常长，ListBox无法滚动到ListBoxItem的末尾。以下是代码：

<Grid>
    <ListBox ScrollViewer.VerticalScrollBarVisibility="Auto" ScrollViewer.HorizontalScrollBarVisibility="Disabled">
        <ListBoxItem>
            <TextBlock Text="abc"/>
        </ListBoxItem>
        <ListBoxItem>
            <TextBlock Text="VerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylong123" TextWrapping="Wrap"/>
        </ListBoxItem>
    </ListBox>
</Grid>

请注意，我将123放在很长的文本的末尾，以查看ListBox是否可以向下滚动以查看文本。但是，这是我向下滚动时看到的内容：

我该怎么做才能让它滚得更低（看TextBlock末尾的“123”）

此外，我希望鼠标滚轮能够在指向ListBoxItem / Text时滚动。

Answer 1

你可以尝试，

ScrollViewer.CanContentScroll="False"

但是由于虚拟化的成本，将CanContentScroll设置为false将禁用ListBox的虚拟化，这可能会导致性能问题。 link - 由Alex

Answer 2

您只需将ListBox放在ScrollViewer：

中

<ScrollViewer>
    <ListBox ScrollViewer.VerticalScrollBarVisibility="Auto" ScrollViewer.HorizontalScrollBarVisibility="Disabled">
        <ListBoxItem>
            <TextBlock Text="abc"/>
        </ListBoxItem>
        <ListBoxItem>
            <TextBlock Text="VerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylong123" TextWrapping="Wrap"/>
        </ListBoxItem>
    </ListBox>
</ScrollViewer>

修改：如果您想要滚动鼠标滚轮，请将PreviewMouseWheel事件添加到ScrollViewer，如下所示：

<ScrollViewer PreviewMouseWheel="UIElement_OnPreviewMouseWheel">

和

private void UIElement_OnPreviewMouseWheel(object sender, MouseWheelEventArgs e)
{
    ScrollViewer scv = (ScrollViewer)sender;
    scv.ScrollToVerticalOffset(scv.VerticalOffset - e.Delta);
    e.Handled = true;
}

Answer 3

将ListBox包裹在ScrollViewer

中

<Grid>
    <ScrollViewer VerticalScrollBarVisibility="Auto">
        <ListBox ScrollViewer.HorizontalScrollBarVisibility="Disabled">
            <ListBoxItem>
                <TextBlock Text="abc"/>
            </ListBoxItem>
            <ListBoxItem>
                <TextBlock Text="VerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylongVerylong123" TextWrapping="Wrap"/>
            </ListBoxItem>
        </ListBox>
    </ScrollViewer>
</Grid>

ListBox无法向下滚动到长ListBoxItem

3 个答案: