修改数据结构增加 TextLine

Editor.cs

@@ -11,7 +11,7 @@ namespace WpfRichTextBox
     {
         public int _fontsize = 16;
 
-        public List<RichChar> RichChars { get; private set; } = new List<RichChar>();
+        public List<TextLine> TextLines { get; private set; } = new List<TextLine>();
 
         public Editor()
         {
@@ -22,50 +22,58 @@ namespace WpfRichTextBox
 
         private void OnPasteHandler(object sender, DataObjectPastingEventArgs e)
         {
-            SyncRichChars();
+            SyncTextLines();
             InvalidateVisual();
         }
 
         private void Editor_TextChanged(object sender, TextChangedEventArgs e)
         {
-            SyncRichChars();
+            SyncTextLines();
             InvalidateVisual();
         }
 
-        private void SyncRichChars()
+        private void SyncTextLines()
         {
-            RichChars.Clear();
+            TextLines.Clear();
             var text = new TextRange(Document.ContentStart, Document.ContentEnd).Text;
-            int maxChars = (int)(ActualWidth / _fontsize);
-            int count = Math.Min(text.Length, maxChars);
-            for (int i = 0; i < count; i++)
+            var lines = text.Split('\n');
+            for (int lineIndex = 0; lineIndex < lines.Length; lineIndex++)
             {
-                RichChars.Add(new RichChar
+                var line = lines[lineIndex];
+                var textLine = new TextLine();
+                for (int i = 0; i < line.Length; i++)
                 {
-                    Character = text[i],
-                    Position = new Point(i * _fontsize, 10),
-                    Color = Colors.Black
-                });
+                    textLine.RichChars.Add(new RichChar
+                    {
+                        Character = line[i],
+                        Position = new Point(i * _fontsize, lineIndex * _fontsize),
+                        Color = Colors.Black
+                    });
+                }
+                TextLines.Add(textLine);
             }
         }
 
         protected override void OnRender(DrawingContext drawingContext)
         {
             base.OnRender(drawingContext);
-            foreach (var richChar in RichChars)
+            foreach (var textLine in TextLines)
             {
-                if (richChar.Position.X >= 0 && richChar.Position.X + _fontsize <= ActualWidth && richChar.Position.Y >= 0 && richChar.Position.Y + _fontsize <= ActualHeight)
+                foreach (var richChar in textLine.RichChars)
                 {
-                    var formattedText = new FormattedText(
-                        richChar.Character.ToString(),
-                        System.Globalization.CultureInfo.CurrentCulture,
-                        FlowDirection.LeftToRight,
-                        new Typeface(this.FontFamily, this.FontStyle, this.FontWeight, this.FontStretch),
-                        _fontsize,
-                        new SolidColorBrush(richChar.Color),
-                        VisualTreeHelper.GetDpi(this).PixelsPerDip);
+                    if (richChar.Position.X >= 0 && richChar.Position.X + _fontsize <= ActualWidth && richChar.Position.Y >= 0 && richChar.Position.Y + _fontsize <= ActualHeight)
+                    {
+                        var formattedText = new FormattedText(
+                            richChar.Character.ToString(),
+                            System.Globalization.CultureInfo.CurrentCulture,
+                            FlowDirection.LeftToRight,
+                            new Typeface(this.FontFamily, this.FontStyle, this.FontWeight, this.FontStretch),
+                            _fontsize,
+                            new SolidColorBrush(richChar.Color),
+                            VisualTreeHelper.GetDpi(this).PixelsPerDip);
 
-                    drawingContext.DrawText(formattedText, richChar.Position);
+                        drawingContext.DrawText(formattedText, richChar.Position);
+                    }
                 }
             }
         }

MainWindow.xaml.cs

@@ -9,10 +9,10 @@ namespace WpfRichTextBox
             InitializeComponent();
 
             new System.Windows.Documents.TextRange(customRichTextBox.Document.ContentStart, customRichTextBox.Document.ContentEnd).Text = "Hello World!";
-            if (customRichTextBox.RichChars.Count > 0)
+            if (customRichTextBox.TextLines.Count > 0 && customRichTextBox.TextLines[0].RichChars.Count > 0)
             {
-                customRichTextBox.RichChars[0].Color = System.Windows.Media.Colors.Red;
-                customRichTextBox.RichChars[0].Position = new System.Windows.Point(50, 50);
+                customRichTextBox.TextLines[0].RichChars[0].Color = System.Windows.Media.Colors.Red;
+                customRichTextBox.TextLines[0].RichChars[0].Position = new System.Windows.Point(50, 50);
                 customRichTextBox.InvalidateVisual();
             }
         }

RichChar.cs

@@ -7,8 +7,7 @@ namespace WpfRichTextBox
     public class RichChar
     {
         public char Character { get; set; }
-        public Point Position { get; set; } // 图片上的坐标
+        public Point Position { get; set; }
         public Color Color { get; set; }
-        // 可扩展其他属性，如字体、大小等
     }
 }

TextLine.cs

@@ -0,0 +1,10 @@
+using System.Collections.Generic;
+
+namespace WpfRichTextBox
+{
+    public class TextLine
+    {
+        public List<RichChar> RichChars { get; set; } = new List<RichChar>();
+        // 可扩展：如行号、行属性等
+    }
+}