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如何滚动到 FlowDocumentReader 的顶部？

内容由绑定设置 

<FlowDocumentReader Grid.Row="4" Grid.Column="0" Name="FlowDocumentPageViewer1" HorizontalAlignment="Stretch">
    <FlowDocumentReader.Document>
        <Binding ElementName="_this" Path="DocFlow" IsAsync="False" Mode="OneWay"/>
    </FlowDocumentReader.Document>                   
</FlowDocumentReader>

如果我向下滚动然后绑定新内容，它不会滚动到顶部。
有了新内容，我想滚动到顶部。

根据 Clemnes 的评论，这滚动到顶部

FlowDocumentPageViewer1.Document.BringIntoView();

现在我的问题是如何自动化该调用。
我不能把它放在 get 中，因为不能在返回后放那个命令。
尝试了这两个事件，但没有通过绑定更新触发

Loaded="FlowDocumentPageViewer1_loaded"  
SourceUpdated="FlowDocumentPageViewer1_loaded"
4

1 回答 1

1

您可以创建一个附加属性来设置原始Document属性并调用BringIntoView()：

public class FlowDocumentReaderEx
{
    public static readonly DependencyProperty DocumentProperty =
        DependencyProperty.RegisterAttached(
            "Document", typeof(FlowDocument), typeof(FlowDocumentReaderEx),
            new FrameworkPropertyMetadata(DocumentPropertyChanged));

    public static FlowDocument GetDocument(DependencyObject obj)
    {
        return (FlowDocument)obj.GetValue(DocumentProperty);
    }

    public static void SetDocument(DependencyObject obj, FlowDocument value)
    {
        obj.SetValue(DocumentProperty, value);
    }

    private static void DocumentPropertyChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
    {
        var flowDocumentReader = obj as FlowDocumentReader;

        if (flowDocumentReader != null)
        {
            flowDocumentReader.Document = e.NewValue as FlowDocument;

            if (flowDocumentReader.Document != null)
            {
                flowDocumentReader.Document.BringIntoView();
            }
        }
    }
}

现在你可以像这样绑定这个属性：

<FlowDocumentReader ...
    local:FlowDocumentReaderEx.Document="{Binding DocFlow, ElementName=_this}"/>
于 2013-08-29T14:21:50.777 回答