Question

我有一个带有FlowDocument的WPF窗口，里面有几个超链接：

<FlowDocumentScrollViewer>
  <FlowDocument TextAlignment="Left" >
     <Paragraph>Some text here
       <Hyperlink Click="Hyperlink_Click">open form</Hyperlink>
     </Paragraph>           
  </FlowDocument>
</FlowDocumentScrollViewer>

在C＃代码中，我处理Click事件以创建并显示一个新的WPF窗口：

private void Hyperlink_Click(object sender, RoutedEventArgs e)
{
    if (sender is Hyperlink)
    {
        var wnd = new SomeWindow();
        //wnd.Left = ???
        //wnd.Top = ???
        wnd.Show();
    }
}

我需要此窗口在超链接的实际位置旁边显示。所以我认为它需要为窗口的Left和Top属性赋值。但我不知道如何获得超链接位置。

Answer 1

您可以使用ContentStart或ContentEnd获取超链接开头或结尾的TextPointer，然后调用GetCharacterRect以获取相对于FlowDocumentScrollViewer的边界框。如果您获得对FlowDocumentScrollViewer的引用，则可以使用PointToScreen将其转换为屏幕坐标。

private void Hyperlink_Click(object sender, RoutedEventArgs e)
{
    var hyperlink = sender as Hyperlink;
    if (hyperlink != null)
    {
        var rect = hyperlink.ContentStart.GetCharacterRect(
            LogicalDirection.Forward);
        var viewer = FindAncestor(hyperlink);
        if (viewer != null)
        {
            var screenLocation = viewer.PointToScreen(rect.Location);

            var wnd = new Window();
            wnd.WindowStartupLocation = WindowStartupLocation.Manual;
            wnd.Top = screenLocation.Y;
            wnd.Left = screenLocation.X;
            wnd.Show();
        }
    }
}

private static FrameworkElement FindAncestor(object element)
{
    while(element is FrameworkContentElement)
    {
        element = ((FrameworkContentElement)element).Parent;
    }
    return element as FrameworkElement;
}

如何确定WPF中超链接的坐标

1 个答案: