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Sanvirtus
Asked:2020-07-12 15:07:31 +0000 UTC2020-07-12 15:07:31 +0000 UTC

在 TextBlock 中选择文本

  • 772

我有一个自定义 TextBlock 可以检测文本中的链接并使它们可点击。需要添加在 TextBlock 中选择任意文本以将其进一步复制到内存缓冲区的功能。任何想法如何做到这一点？

超链接文本块类：

public class HyperlinkTextBlock : TextBlock
{
    private static readonly Regex HyperlinkRegex = new Regex(@"(https?|ftp):\/\/[^\s/$.?#].[^\s,]*");

    public static readonly DependencyProperty HyperlinkStyleProperty = DependencyProperty.Register("HyperlinkStyle",
        typeof(Style), typeof(HyperlinkTextBlock));

    static HyperlinkTextBlock()
    {
        DefaultStyleKeyProperty.OverrideMetadata(typeof(HyperlinkTextBlock),
            new FrameworkPropertyMetadata(typeof(HyperlinkTextBlock)));
    }

    public HyperlinkTextBlock()
    {
        TargetUpdated += (s, args) =>
            Dispatcher.BeginInvoke(DispatcherPriority.ContextIdle, new Action(ParseHyperlinks));
    }

    public event EventHandler<HyperlinkPressedEventArgs> HyperlinkPressed;

    public Style HyperlinkStyle
    {
        private get => (Style) GetValue(HyperlinkStyleProperty);
        set => SetValue(HyperlinkStyleProperty, value);
    }

    private void ParseHyperlinks()
    {
        var text = Text;
        var matches = HyperlinkRegex.Matches(text);
        if (matches.Count == 0)
            return;

        Inlines.Clear();
        var lastIndex = 0;
        foreach (Match match in matches)
        {
            Inlines.Add(text.Substring(lastIndex, match.Index - lastIndex));
            lastIndex = match.Index + match.Length;
            var run = new Run(match.Value) {Style = HyperlinkStyle};
            run.MouseDown += RunOnMouseDown;
            Inlines.Add(run);
        }

        Inlines.Add(text.Substring(lastIndex));
    }

    private void RunOnMouseDown(object sender, MouseButtonEventArgs args)
    {
        if (!(sender is Run run)) return;

        var handler = HyperlinkPressed;
        handler?.Invoke(this, new HyperlinkPressedEventArgs(run.Text));
    }
}

public class HyperlinkPressedEventArgs : EventArgs
{
    public readonly Uri Hyperlink;

    public HyperlinkPressedEventArgs(string hyperlink)
    {
        Hyperlink = new Uri(hyperlink);
    }
}

用法：

<Style x:Key="HyperlinkStyle" TargetType="{x:Type Run}">
    <Style.Setters>
        <Setter Property="Foreground" Value="Blue" />
        <Setter Property="TextDecorations" Value="Underline" />
    </Style.Setters>
    <Style.Triggers>
        <Trigger Property="IsMouseOver" Value="True">
            <Setter Property="Cursor" Value="Hand" />
            <Setter Property="Foreground" Value="Orange" />
        </Trigger>
    </Style.Triggers>
</Style>

<htb:HyperlinkTextBlock Background="Transparent"
                        Margin="10,0,0,0"
                        HyperlinkStyle="{StaticResource HyperlinkStyle}"
                        HyperlinkPressed="OnHyperlinkPressed"
                        Text="{Binding Message, NotifyOnTargetUpdated=True}"
                        TextWrapping="Wrap" />

private void OnHyperlinkPressed(object sender, HyperlinkPressedEventArgs args)
{
    System.Diagnostics.Process.Start(args.Hyperlink.OriginalString);
}
c#

2 个回答

  1. Best Answer

    通常由TextBox. 他们将其风格化TextBlock（删除框架，背景等）使其只读，仅此而已。在这里，您可以选择复制。

    更新。我想出了一个快速的解决方案RichTextBox（也许有人会提供更好的，我只是为了）：

    public class HyperlinkRichTextBox : RichTextBox
{

    #region CustomText Dependency Property

    public static readonly DependencyProperty CustomTextProperty = DependencyProperty.Register("CustomText", typeof(string), typeof(HyperlinkRichTextBox),
        new PropertyMetadata(string.Empty, CustomTextChangedCallback), CustomTextValidateCallback);

    public string CustomText
    {
        get => (string)GetValue(CustomTextProperty);
        set => SetValue(CustomTextProperty, value);
    }

    private static void CustomTextChangedCallback(
                DependencyObject obj, DependencyPropertyChangedEventArgs e)
    {
        ((HyperlinkRichTextBox) obj).Document = GetCustomDocument(e.NewValue as string);
    }

    private static bool CustomTextValidateCallback(object value) => value != null;
    #endregion

    private const string HttpPrefix = "http://";

    private static readonly Regex LinkRegex =
                new Regex(
            @"([--:А-Яа-я\w?@%&+~#=]*\.[a-zа-я]{2,4}\/{0,2})((?:[?&](?:[А-Яа-я\w]+)=(?:[А-Яа-я\w]+))+|[--:А-Яа-я\w?@%&+~#=]+)?",
            RegexOptions.Compiled);

    private static readonly Regex PrefixRegex = 
        new Regex("^(http|ftp)(s)?", RegexOptions.Compiled);

    private static FlowDocument GetCustomDocument(string text)
    {
        var document = new FlowDocument();
        var para = new Paragraph {Margin = new Thickness(0)};

        var linksMatches = LinkRegex.Matches(text);


        if (linksMatches.Count == 0)
        {
            para.Inlines.Add(text);
        }
        else
        {
            Match lastMatch = null;
            foreach (Match linksMatch in linksMatches)
            {
                var previousText = GetPreviousText(text, lastMatch, linksMatch);

                para.Inlines.Add(previousText);

                var link = CreateLink(linksMatch.Value);
                para.Inlines.Add(link);
                lastMatch = linksMatch;
            }
            var tail = GetPreviousText(text, lastMatch);
            para.Inlines.Add(tail);
        }

        document.Blocks.Add(para);
        return document;
    }

    private static Hyperlink CreateLink(string url)
    {
        var link = new Hyperlink
        {
            IsEnabled = true
        };

        link.Inlines.Add(url);

        link.NavigateUri = PrefixRegex.IsMatch(url)
            ? new Uri(url)
            : new Uri($"{HttpPrefix}{url}");

        link.RequestNavigate += (sender, args) => Process.Start(args.Uri.ToString());

        return link;
    }

    private static string GetPreviousText(string text, Capture lastMatch, Capture currentMatch = null)
    {
        var startIndex = lastMatch != null ? lastMatch.Index + lastMatch.Length : 0;

        return currentMatch != null
            ? text.Substring(startIndex, currentMatch.Index - startIndex)
            : text.Substring(startIndex);
    }
}

    我们这样声明：

    <local:HyperlinkRichTextBox BorderThickness="0" Padding="-5" CustomText="{Binding Text}" IsReadOnly="True" IsDocumentEnabled="True">

    Padding="-5"添加以便显示与 匹配TextBlock。

    在此处输入图像描述

    而且，当然，可以选择和复制

    在此处输入图像描述

    • 5

  2. 我不知道这些方法是否正确，但是您可以在按 RMB（或您的选项）时将类型文本添加到 ToolTip，此链接将被复制。或者用 Heder = "Copy link" 组织一个 MenuItem 并调用 copy 方法。根据代码示例，我不知道该给您什么。

    • -1

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