Initial commit

TextFragment.cs

@@ -0,0 +1,64 @@
+using System.Globalization;
+using System.Windows;
+using System.Windows.Media;
+
+namespace ChrisKaczor.Wpf.Controls
+{
+    public class TextFragment
+    {
+        private readonly HtmlTextBlock _parent;
+
+        public Brush Color { get; set; }
+        public FontStyle Style { get; set; }
+        public FontWeight Weight { get; set; }
+        public double Size { get; set; }
+        public string Text { get; set; }
+        public bool Underline { get; set; }
+
+        private Typeface? _typeface;
+
+        private Typeface Typeface
+        {
+            get { return _typeface ??= new Typeface(_parent.FontFamily, Style, Weight, _parent.FontStretch); }
+        }
+
+        private FormattedText? _formattedText;
+        public FormattedText FormattedText
+        {
+            get
+            {
+                if (_formattedText != null) 
+                    return _formattedText;
+
+                var measureText = string.IsNullOrEmpty(Text) ? " " : Text;
+
+                _formattedText = new FormattedText(measureText, CultureInfo.CurrentUICulture, FlowDirection.LeftToRight, Typeface, Size, Color, null, TextFormattingMode.Display, 1);
+
+                var textDecorationCollection = new TextDecorationCollection();
+
+                if (Underline)
+                {
+                    var underlineDecoration = new TextDecoration { PenThicknessUnit = TextDecorationUnit.FontRecommended };
+
+                    textDecorationCollection.Add(underlineDecoration);
+                }
+
+                _formattedText.SetTextDecorations(textDecorationCollection);
+
+                return _formattedText;
+            }
+        }
+
+        public TextFragment(HtmlTextBlock parent)
+        {
+            _parent = parent;
+
+            Color = _parent.Foreground;
+            Style = _parent.FontStyle;
+            Weight = _parent.FontWeight;
+            Size = _parent.FontSize;
+            Text = string.Empty;
+            Underline = false;
+        }
+    }
+}