C# 如何以编程方式滚动 WPF 列表视图？
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How can I programmatically scroll a WPF listview?
提问by Joan Venge
Is it possible to programmatically scroll a WPF listview? I know winforms doesn't do it, right?
是否可以以编程方式滚动 WPF 列表视图？我知道 winforms 不会这样做，对吧？
I am talking about say scrolling 50 units up or down, etc. Not scrolling an entire item height at once.
我说的是向上或向下滚动 50 个单位，等等。不是一次滚动整个项目高度。
采纳答案by rmoore
Yes, you'll have to grab the ScrollViwer from the ListView, or but once you have access to that, you can use the methods exposed by it or override the scrolling. You can also scroll by getting the main content area and using it's implementation of the IScrollInfointerface.
是的，您必须从 ListView 中获取 ScrollViwer，或者一旦您可以访问它，您就可以使用它公开的方法或覆盖滚动。您还可以通过获取主要内容区域并使用它的IScrollInfo接口实现来滚动。
Here's a little helper to get the ScrollViwer component of something like a ListBox, ListView, etc.
这里有一个小助手，用于获取 ListBox、ListView 等内容的 ScrollViwer 组件。
public static DependencyObject GetScrollViewer(DependencyObject o)
{
// Return the DependencyObject if it is a ScrollViewer
if (o is ScrollViewer)
{ return o; }
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(o); i++)
{
var child = VisualTreeHelper.GetChild(o, i);
var result = GetScrollViewer(child);
if (result == null)
{
continue;
}
else
{
return result;
}
}
return null;
}
And then you can just use .LineUp() and .LineDown() like this:
然后你可以像这样使用 .LineUp() 和 .LineDown() ：
private void OnScrollUp(object sender, RoutedEventArgs e)
{
var scrollViwer = GetScrollViewer(uiListView) as ScrollViewer;
if (scrollViwer != null)
{
// Logical Scrolling by Item
// scrollViwer.LineUp();
// Physical Scrolling by Offset
scrollViwer.ScrollToVerticalOffset(scrollViwer.VerticalOffset + 3);
}
}
private void OnScrollDown(object sender, RoutedEventArgs e)
{
var scrollViwer = GetScrollViewer(uiListView) as ScrollViewer;
if (scrollViwer != null)
{
// Logical Scrolling by Item
// scrollViwer.LineDown();
// Physical Scrolling by Offset
scrollViwer.ScrollToVerticalOffset(scrollViwer.VerticalOffset + 3);
}
}
<DockPanel>
<Button DockPanel.Dock="Top"
Content="Scroll Up"
Click="OnScrollUp" />
<Button DockPanel.Dock="Bottom"
Content="Scroll Down"
Click="OnScrollDown" />
<ListView x:Name="uiListView">
<!-- Content -->
</ListView>
</DockPanel>
The Logical scrolling exposed by LineUp and LineDown do still scroll by item, if you want to scroll by a set amount you should use the ScrollToHorizontal/VerticalOffset that I've used above. If you want some more complex scrolling too, then take a look at the answer I've provided in this other question.
LineUp 和 LineDown 公开的逻辑滚动仍然按项目滚动，如果您想按设定的数量滚动，您应该使用我上面使用的 ScrollToHorizontal/VerticalOffset。如果您还想要一些更复杂的滚动，请查看我在另一个问题中提供的答案。
回答by Eclipse
Have you tried ScrollIntoView? Alternatively, if it's not a specific item you brought into view, but an offset from the current position, you can use BringIntoView.
你试过ScrollIntoView吗？或者，如果它不是您带入视图的特定项目，而是与当前位置的偏移，您可以使用BringIntoView。
