从代码滚动WPF FlowDocumentScrollViewer？ [英] Scroll a WPF FlowDocumentScrollViewer from code?

问题描述

我有一个FlowDocumentScrollViewer，我想在添加文本时自动滚动到底部的
。

I have a FlowDocumentScrollViewer I want to automatically scroll to the bottom when text is added.

<FlowDocumentScrollViewer Name="Scroller">
 <FlowDocument Foreground="White" Name="docDebug" FontFamily="Terminal">
  <Paragraph Name="paragraphDebug"/>
 </FlowDocument>
</FlowDocumentScrollViewer>

在代码中我将Inlines添加到段落中，但是当文本过多时，我会添加
希望能够简单地使用代码向下滚动而不是让用户这样做。

In code I add Inlines to the Paragraph, but when there is to much text I would like to be able to simply scroll down using code instead of having the user doing so.

有任何建议吗？

推荐答案

此处给出的其他答案有些令人困惑，因为在FlowDocumentScrollViewer上没有看到任何公共的 ScrollViewer属性。

The other answers given here are a bit puzzling, since I don't see any public "ScrollViewer" property on the FlowDocumentScrollViewer.

我这样解决了这个问题。请注意，此方法在初始化期间可以返回null：

I hacked around the problem like this. Beware that this method can return null during initialization:

public static ScrollViewer FindScrollViewer(this FlowDocumentScrollViewer flowDocumentScrollViewer)
{
    if (VisualTreeHelper.GetChildrenCount(flowDocumentScrollViewer) == 0)
    {
        return null;
    }

    // Border is the first child of first child of a ScrolldocumentViewer
    DependencyObject firstChild = VisualTreeHelper.GetChild(flowDocumentScrollViewer, 0);
    if (firstChild == null)
    {
        return null;
    }

    Decorator border = VisualTreeHelper.GetChild(firstChild, 0) as Decorator;

    if (border == null)
    {
        return null;
    }

    return border.Child as ScrollViewer;
}

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