Question

我在这段代码中得到了错误：

<TextBlock>
   <Run>let me</Run>
   <Hyperlink NavigateUri="http://www.google.com">google</Hyperlink>
   <Run>that for you</Run>
</TextBlock>

如果无法添加超链接，为什么它在TextBlock中可用？

上下文 我想在LongListSelector内展示一些评论。评论可能包含链接，我可以使用RichTextBox，但我认为它未针对UI and Data Virtualization内的LongListSelector进行优化，因此我更倾向于使用TextBlock

<phone:LongListSelector ItemsSource="{Binding Reviews}">
    <phone:LongListSelector.ItemTemplate>
        <DataTemplate>
            <TextBlock Text={Binding Review}/>
        </DataTemplate>
    </phone:LongListSelector.ItemTemplate>
</phone:LongListSelector>

Answer 1

您可以使用依赖项属性将“带超链接的文本”绑定到 ~~RichTextBlock~~ RichEditBox。它会将每个超链接转换为HyperlinkButton。我建议您自定义RichEditBox，使其看起来更像TextBlock。同时自定义HyperlinkButton以查找内联。

public static class NavigationService
{
    // Copied from http://geekswithblogs.net/casualjim/archive/2005/12/01/61722.aspx
    private static readonly Regex RE_URL = new Regex(@"(?#Protocol)(?:(?:ht|f)tp(?:s?)\:\/\/|~/|/)?(?#Username:Password)(?:\w+:\w+@)?(?#Subdomains)(?:(?:[-\w]+\.)+(?#TopLevel Domains)(?:com|org|net|gov|mil|biz|info|mobi|name|aero|jobs|museum|travel|[a-z]{2}))(?#Port)(?::[\d]{1,5})?(?#Directories)(?:(?:(?:/(?:[-\w~!$+|.,=]|%[a-f\d]{2})+)+|/)+|\?|#)?(?#Query)(?:(?:\?(?:[-\w~!$+|.,*:]|%[a-f\d{2}])+=(?:[-\w~!$+|.,*:=]|%[a-f\d]{2})*)(?:&(?:[-\w~!$+|.,*:]|%[a-f\d{2}])+=(?:[-\w~!$+|.,*:=]|%[a-f\d]{2})*)*)*(?#Anchor)(?:#(?:[-\w~!$+|.,*:=]|%[a-f\d]{2})*)?");

    public static readonly DependencyProperty TextProperty = DependencyProperty.RegisterAttached(
        "Text",
        typeof(string),
        typeof(NavigationService),
        new PropertyMetadata(null, OnTextChanged)
    );

    public static string GetText(DependencyObject d) { return d.GetValue(TextProperty) as string; }

    public static void SetText(DependencyObject d, string value) { d.SetValue(TextProperty, value); }

    static Paragraph paragraph = new Paragraph();
    private static void OnTextChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var text_block = d as RichTextBox;
        if (text_block == null)
            return;

        text_block.Blocks.Clear();

        var new_text = (string)e.NewValue;
        if (string.IsNullOrEmpty(new_text))
            return;

        // Find all URLs using a regular expression
        int last_pos = 0;
        foreach (Match match in RE_URL.Matches(new_text))
        {
            // Copy raw string from the last position up to the match
            if (match.Index != last_pos)
            {
                var raw_text = new_text.Substring(last_pos, match.Index - last_pos);
                //text_block.Inlines.Add(new Run(raw_text));
                //var paragraph1 = new Paragraph();
                paragraph.Inlines.Add(new Run { Text = raw_text });
                if (text_block.Blocks.Contains(paragraph))
                {
                    text_block.Blocks.Add(paragraph);
                }
            }

            // Create a hyperlink for the match
            var link = new HyperlinkButton()
            {
                Content = match.Value,
                NavigateUri = new Uri(match.Value),
                Margin = new Thickness(-20, 0, -20, -15),
                FontSize = 20,
                TargetName = "_blank"
            };
            link.Click += OnUrlClick;


            var inlineUi = new InlineUIContainer();
            inlineUi.Child = link;
            if (!paragraph.Inlines.Contains(inlineUi))
            {
                paragraph.Inlines.Add(inlineUi);
            }
            if (text_block.Blocks.Contains(paragraph))
            {
                text_block.Blocks.Add(paragraph);
            }

            //text_block.Inlines.Add(link);

            // Update the last matched position
            last_pos = match.Index + match.Length;
        }

        // Finally, copy the remainder of the string
        if (last_pos < new_text.Length)
        {
            //var paragraph = new Paragraph();
            paragraph.Inlines.Add(new Run { Text = new_text.Substring(last_pos) });
            text_block.Blocks.Add(paragraph);
        }
    }

    private static void OnUrlClick(object sender, RoutedEventArgs e)
    {
        var link = (HyperlinkButton)sender;
        // Do something with link.NavigateUri otherwise by default it would be open in IE.
    }
}

<RichTextBox local:NavigationService.Text="{Binding Review}" IsReadOnly="True" />

代码复制＆amp;从here调整

无法将HyperLink的值添加到TextBlock的内联集合中

1 个答案: