HexEditor - HexLabelEx control that will paint multiple colours within a Label

src/BizHawk.Client.EmuHawk/tools/HexEditor/HexEditor.Designer.cs

@@ -89,7 +89,7 @@ namespace BizHawk.Client.EmuHawk
 			this.MemoryViewerBox = new System.Windows.Forms.GroupBox();
 			this.HexScrollBar = new System.Windows.Forms.VScrollBar();
 			this.AddressLabel = new BizHawk.WinForms.Controls.LocLabelEx();
-			this.AddressesLabel = new BizHawk.WinForms.Controls.LocLabelEx();
+			this.AddressesLabel = new BizHawk.WinForms.Controls.HexLabelEx();
 			this.Header = new BizHawk.WinForms.Controls.LocLabelEx();
 			this.HexMenuStrip.SuspendLayout();
 			this.ViewerContextMenuStrip.SuspendLayout();
@@ -454,6 +454,7 @@ namespace BizHawk.Client.EmuHawk
 			this.AddressesLabel.MouseLeave += new System.EventHandler(this.AddressesLabel_MouseLeave);
 			this.AddressesLabel.MouseMove += new System.Windows.Forms.MouseEventHandler(this.AddressesLabel_MouseMove);
 			this.AddressesLabel.MouseUp += new System.Windows.Forms.MouseEventHandler(this.AddressesLabel_MouseUp);
+			this.AddressesLabel.Paint += new System.Windows.Forms.PaintEventHandler(this.AddressesLabel_Paint);
 			// 
 			// Header
 			// 
@@ -511,7 +512,7 @@ namespace BizHawk.Client.EmuHawk
 		private BizHawk.WinForms.Controls.ToolStripMenuItemEx AddToRamWatchMenuItem;
 		private BizHawk.WinForms.Controls.ToolStripMenuItemEx FreezeAddressMenuItem;
 		public System.Windows.Forms.GroupBox MemoryViewerBox;
-		private BizHawk.WinForms.Controls.LocLabelEx AddressesLabel;
+		private BizHawk.WinForms.Controls.HexLabelEx AddressesLabel;
 		private System.Windows.Forms.VScrollBar HexScrollBar;
 		private BizHawk.WinForms.Controls.ToolStripMenuItemEx UnfreezeAllMenuItem;
 		private BizHawk.WinForms.Controls.ToolStripMenuItemEx UnfreezeAllContextItem;

src/BizHawk.Client.EmuHawk/tools/HexEditor/HexEditor.cs

@@ -2055,6 +2055,54 @@ namespace BizHawk.Client.EmuHawk
 			}
 		}
 
+		private void AddressesLabel_Paint(object sender, PaintEventArgs e)
+		{
+			return;
+
+			if (sender is not Label label)
+				return;
+
+			char gap = ' ';
+
+			//PointF point = new PointF(label.Location.X, label.Location.Y);
+			PointF point = new PointF(0, 0);
+			string text = label.Text;
+			Font font = label.Font;
+
+			string[] lines = text.Split(new[] { "\r\n", "\r", "\n" }, StringSplitOptions.None);
+
+			Color color = label.ForeColor;
+
+			foreach (string line in lines)
+			{
+				string[] words = line.Split(gap);
+
+				foreach (string word in words)
+				{
+					if (word == "00")
+					{
+						color = Color.SlateGray;
+					}
+					else
+					{
+						color = label.ForeColor;
+					}
+
+					SizeF size = e.Graphics.MeasureString(word, font);
+
+					using (Brush brush = new SolidBrush(color))
+					{
+						e.Graphics.DrawString(word, font, brush, point);
+					}
+
+					point.X += size.Width + e.Graphics.MeasureString(gap.ToString(), font).Width;
+				}
+
+				point.X = label.Location.X;
+				point.Y += e.Graphics.MeasureString(line, font).Height;
+			}
+		}
+
 		private void MemoryViewerBox_Paint(object sender, PaintEventArgs e)
 		{
 			var activeCheats = MainForm.CheatList.Where(x => x.Enabled);

src/BizHawk.WinForms.Controls/BizHawk.WinForms.Controls.csproj

@@ -10,4 +10,9 @@
 		<PackageReference Include="System.Drawing.Common" />
 		<ProjectReference Include="$(ProjectDir)../BizHawk.Common/BizHawk.Common.csproj" />
 	</ItemGroup>
+	<ItemGroup>
+	  <Compile Update="LabelEx\HexLabelEx.cs">
+	    <SubType>Component</SubType>
+	  </Compile>
+	</ItemGroup>
 </Project>

src/BizHawk.WinForms.Controls/LabelEx/HexLabelEx.cs

@@ -0,0 +1,121 @@
+using System.ComponentModel;
+using System.Drawing;
+using System.Windows.Forms;
+using BizHawk.Common;
+
+
+namespace BizHawk.WinForms.Controls
+{
+	/// <inheritdoc cref="Docs.LabelOrLinkLabel"/>
+	public class HexLabelEx : LabelExBase
+	{
+		[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
+		public new bool AutoSize => base.AutoSize;
+
+		[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
+		public new Size Size => base.Size;
+
+		public Color ZeroColor { get; set; } = Color.SlateGray;
+
+		private float spacingHexModifier;
+		private float spacingPreDivider;
+		private float spacingPostDividerModifier;
+		private float spacingAscii;
+		private float spacingLineModifier;
+
+		public HexLabelEx()
+		{
+			base.AutoSize = true;
+			this.BackColor = Color.Transparent;
+
+			spacingHexModifier = 0.7F;
+			spacingPreDivider = 3.0F;
+			spacingPostDividerModifier = 3.5F;
+			spacingAscii = 7.0F;
+			spacingLineModifier = 0.56F;
+
+			if (OSTailoredCode.IsUnixHost)
+			{
+				// TODO: spacing values will probably be different on linux
+			}
+		}
+
+		protected override void OnPaint(PaintEventArgs e)
+		{
+			string text = this.Text;
+			Font font = this.Font;
+			PointF point = new PointF(0, 0);
+			char gap = ' ';
+
+			string[] lines = text.Split(new[] { "\r\n", "\r", "\n" }, StringSplitOptions.None);
+
+			Color color00 = this.ForeColor;
+			Color color = this.ForeColor;
+
+			foreach (string line in lines)
+			{
+				// split left and right panes
+				string[] panes = line.Split('|');
+
+				if (panes.Length < 2)
+				{
+					// skip - last line appears to be empty
+					continue;
+				}
+
+				// hex pane
+				string[] words = panes[0].Split(gap);
+				foreach (var word in words)
+				{
+					SizeF size = e.Graphics.MeasureString(word, font);
+
+					switch (word)
+					{
+						case "00":
+							color = ZeroColor;
+							break;
+
+						default:
+							color = this.ForeColor;
+							break;
+					}
+					using (Brush brush = new SolidBrush(color))
+					{
+						e.Graphics.DrawString(word, font, brush, point);
+					}
+
+					point.X += size.Width + e.Graphics.MeasureString(gap.ToString(), font).Width + spacingHexModifier;
+				}
+
+				// divider
+				string div = "|";
+				point.X -= spacingPreDivider;
+				SizeF sizeDiv = e.Graphics.MeasureString(div, font);
+				using (Brush brush = new SolidBrush(this.ForeColor))
+				{
+					e.Graphics.DrawString(div, font, brush, point);					
+				}
+
+				point.X += e.Graphics.MeasureString(gap.ToString(), font).Width + spacingPostDividerModifier;
+
+				// ascii pane
+				char[] chars = panes[1].ToCharArray();
+				foreach (var c in chars)
+				{
+					string str = c.ToString();
+
+					using (Brush brush = new SolidBrush(this.ForeColor))
+					{
+						e.Graphics.DrawString(str, font, brush, point);
+					}
+
+					// fixed size
+					point.X += spacingAscii;
+				}
+
+				point.X = 0;
+				point.Y += e.Graphics.MeasureString(line, font).Height + spacingLineModifier;
+			}
+		}
+	}
+}