73 lines
2.4 KiB
C#
73 lines
2.4 KiB
C#
using System.Globalization;
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using System.Text.RegularExpressions;
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using System.Windows.Data;
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using System.Windows.Documents;
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namespace Melskin.Converters.Internal;
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/// <summary>
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/// StringToCodeConverter 类实现了 IValueConverter 接口，用于将字符串转换为具有代码样式的 RichTextBox 控件。该类提供了一个静态实例 Instance，用于在 XAML 中方便地引用。
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/// 通过 Convert 方法，可以将输入的字符串转换为富文本格式，并且会对字符串中的特殊字符（如引号、尖括号等）进行高亮显示。ConvertBack 方法返回 DependencyProperty.UnsetValue，表示不支持反向转换。
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/// </summary>
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internal class StringToCodeConverter : IValueConverter
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{
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//显式静态构造函数告诉c#编译器
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//不将type标记为beforefieldinit
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static StringToCodeConverter()
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{
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}
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private StringToCodeConverter()
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{
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}
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/// <summary>
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///
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/// </summary>
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public static StringToCodeConverter Instance { get; } = new();
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/// <inheritdoc />
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public object Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
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{
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var str = value as string;
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var textBox = new RichTextBox()
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{
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IsReadOnly = true,
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FontSize = 12,
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Foreground = Brushes.Red,
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BorderThickness = new Thickness(0),
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};
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if (string.IsNullOrEmpty(str)) return textBox;
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const string pattern = "=\".*?\"|[</>]";
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var index = 0;
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var document = new FlowDocument();
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var paragraph = new Paragraph();
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var inlines = paragraph.Inlines;
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str = str?.Replace(@"\n", Environment.NewLine).Replace(@"\t", "\t");
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if (str != null)
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{
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foreach (Match match in Regex.Matches(str, pattern))
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{
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inlines.Add(str.Substring(index, match.Index - index));
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inlines.Add(new Run(match.Value) { Foreground = Brushes.Blue });
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index = match.Index + match.Length;
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}
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inlines.Add(str.Substring(index));
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}
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document.Blocks.Add(paragraph);
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textBox.Document = document;
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return textBox;
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}
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/// <inheritdoc />
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public object ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
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{
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return DependencyProperty.UnsetValue;
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}
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} |