Improve ThemedMessageBox with wrapping logic and default system icons.

Move Eto.IO.SystemIcons to Eto.Drawing, and add Information, Warning, Error, and Question icons.

src/Eto.Gtk/Drawing/SystemIconsHandler.cs

@@ -0,0 +1,19 @@
+namespace Eto.GtkSharp.Drawing;
+
+public class SystemIconsHandler : SystemIcons.IHandler
+{
+	#region ISystemIcons Members
+
+	public Icon GetFileIcon(string fileName, SystemIconSize size)
+	{
+		return null;
+	}
+
+	public Icon Get(SystemIconType type, SystemIconSize size)
+	{
+		return null;
+	}
+
+	#endregion
+
+}

src/Eto.Gtk/NativeMethods.cs

@@ -30,7 +30,7 @@ public struct FcFontSet
 		static class NMWindows
 		{
 
-#if NETCOREAPP
+#if NET
 
 			static NMWindows()
 			{
@@ -255,7 +255,7 @@ static NMWindows()
 		static class NMLinux
 		{
 
-#if NETCOREAPP
+#if NET
 
 			static NMLinux()
 			{
@@ -480,7 +480,7 @@ static NMLinux()
 		static class NMMac
 		{
 
-#if NETCOREAPP
+#if NET
 
 			static NMMac()
 			{

src/Eto.Gtk/Platform.cs

@@ -1,10 +1,8 @@
-using Eto.IO;
 using Eto.GtkSharp.Drawing;
 using Eto.GtkSharp.Forms.Cells;
 using Eto.GtkSharp.Forms.Controls;
 using Eto.GtkSharp.Forms.Printing;
 using Eto.GtkSharp.Forms;
-using Eto.GtkSharp.IO;
 using Eto.Forms.ThemedControls;
 using Eto.GtkSharp.Forms.Menu;
 using Eto.GtkSharp.Forms.ToolBar;

src/Eto.Mac/Drawing/SystemIconsHandler.cs

@@ -0,0 +1,54 @@
+using Eto.Mac.Drawing;
+
+namespace Eto.Mac.Drawing;
+
+public class SystemIconsHandler : SystemIcons.IHandler
+{
+
+	public Icon GetFileIcon(string fileName, SystemIconSize size)
+	{
+		var ws = new NSWorkspace();
+		var image = ws.IconForFileType(Path.GetExtension(fileName));
+		return WithSize(new Icon(new IconHandler(image)), size);
+	}
+
+	public Icon Get(SystemIconType type, SystemIconSize size)
+	{
+		var icon = type switch
+		{
+			SystemIconType.OpenDirectory => new Icon(new IconHandler(NSImage.ImageNamed(NSImageName.Folder))),
+			SystemIconType.CloseDirectory => new Icon(new IconHandler(NSImage.ImageNamed(NSImageName.Folder))),
+			SystemIconType.Question => GetResourceIcon("GenericQuestionMarkIcon.icns"),
+			SystemIconType.Error => GetResourceIcon("AlertStopIcon.icns"),
+			SystemIconType.Information => GetResourceIcon("AlertNoteIcon.icns"),
+			SystemIconType.Warning => new Icon(new IconHandler(NSImage.ImageNamed(NSImageName.Caution))),
+			_ => throw new NotSupportedException(),
+		};
+
+		return WithSize(icon, size);
+	}
+
+	private static Icon WithSize(Icon icon, SystemIconSize size)
+	{
+		var pixels = size switch
+		{
+			SystemIconSize.Large => 32,
+			SystemIconSize.Small => 16,
+			_ => throw new NotSupportedException()
+		};
+
+		return icon.WithSize(pixels, pixels);
+	}
+
+	private static Icon GetResourceIcon(string name)
+	{
+		const string basePath = "/System/Library/CoreServices/CoreTypes.bundle/Contents/Resources";
+		var path = Path.Combine(basePath, name);
+		if (File.Exists(path))
+		{
+			return new Icon(path);
+		}
+		return null;
+	}
+}
+

src/Eto.Mac/MacConversions.cs

@@ -658,5 +658,13 @@ public static NSTextAlignment ToNS(this FormattedTextAlignment align)
 					throw new NotSupportedException();
 			}
 		}
+
+		public static Image ToEto(this NSImage image)
+		{
+			if (image.Representations().Length == 1)
+				return new Bitmap(new BitmapHandler(image));
+			else
+				return new Icon(new IconHandler(image));
+		}
 	}
 }

src/Eto.Mac/Platform.cs

@@ -1,6 +1,4 @@
-using Eto.IO;
 using Eto.Mac.Drawing;
-using Eto.Mac.IO;
 using Eto.Mac.Forms.Controls;
 using Eto.Mac.Forms.Printing;
 using Eto.Mac.Forms;

src/Eto.WinForms/Drawing/IconHandler.cs

@@ -1,3 +1,5 @@
+using System.Windows.Controls;
+
 namespace Eto.WinForms.Drawing
 {
 	public interface IWindowsIconSource
@@ -7,14 +9,20 @@ public interface IWindowsIconSource
 
 	public class IconHandler : WidgetHandler<sd.Icon, Icon>, Icon.IHandler, IWindowsImage, IWindowsIconSource
 	{
-		Dictionary<int, sd.Image> cachedImages;
-		List<IconFrame> frames;
-		IconFrame idealFrame;
+		Dictionary<int, sd.Image> _cachedImages;
+		List<IconFrame> _frames;
+		IconFrame _idealFrame;
+		bool _destroyIcon;
 
 		public IconHandler(sd.Icon control)
 		{
 			this.Control = control;
 		}
+		public IconHandler(sd.Icon control, bool destroyIcon)
+		{
+			this.Control = control;
+			_destroyIcon = destroyIcon;
+		}
 
 		public IconHandler()
 		{
@@ -33,7 +41,7 @@ public IEnumerable<IconFrame> Frames
 		{
 			get
 			{
-				return frames ?? SplitIcon(Control);
+				return _frames ?? SplitIcon(Control);
 			}
 		}
 
@@ -49,11 +57,11 @@ public void Create(string fileName)
 
 		public IconFrame GetIdealIcon()
 		{
-			if (idealFrame != null)
-				return idealFrame;
+			if (_idealFrame != null)
+				return _idealFrame;
 			var orderedFrames = SplitIcon(Control).OrderByDescending(r => r.PixelSize.Width * r.PixelSize.Height);
-			idealFrame = orderedFrames.FirstOrDefault(r => r.Scale == 1) ?? orderedFrames.First();
-			return idealFrame;
+			_idealFrame = orderedFrames.FirstOrDefault(r => r.Scale == 1) ?? orderedFrames.First();
+			return _idealFrame;
 		}
 
 		public sd.Icon GetIconClosestToSize(int width)
@@ -75,8 +83,8 @@ public sd.Icon GetIconClosestToSize(int width)
 
 		public List<IconFrame> SplitIcon(sd.Icon icon)
 		{
-			if (frames != null)
-				return frames;
+			if (_frames != null)
+				return _frames;
 			if (icon == null)
 			{
 				throw new ArgumentNullException("icon");
@@ -94,54 +102,65 @@ public List<IconFrame> SplitIcon(sd.Icon icon)
 			var splitIcons = new List<sd.Icon>();
 			int count = BitConverter.ToInt16(srcBuf, 4); // ICONDIR.idCount
 
-			for (int i = 0; i < count; i++)
+			if (count == 1)
+			{
+				splitIcons.Add(icon);
+			}
+			else
 			{
-				using (var destStream = new MemoryStream())
-				using (var writer = new BinaryWriter(destStream))
+				for (int i = 0; i < count; i++)
 				{
-					// Copy ICONDIR and ICONDIRENTRY.
-					int pos = 0;
-					writer.Write(srcBuf, pos, sICONDIR - 2);
-					writer.Write((short)1);    // ICONDIR.idCount == 1;
-
-					pos += sICONDIR;
-					pos += sICONDIRENTRY * i;
-
-					writer.Write(srcBuf, pos, sICONDIRENTRY - 4); // write out icon info (minus old offset)
-					writer.Write(sICONDIR + sICONDIRENTRY);    // write offset of icon data
-					pos += 8;
-
-					// Copy picture and mask data.
-					int imgSize = BitConverter.ToInt32(srcBuf, pos);       // ICONDIRENTRY.dwBytesInRes
-					pos += 4;
-					int imgOffset = BitConverter.ToInt32(srcBuf, pos);    // ICONDIRENTRY.dwImageOffset
-					if (imgOffset + imgSize > srcBuf.Length)
-						throw new ArgumentException("ugh");
-					writer.Write(srcBuf, imgOffset, imgSize);
-					writer.Flush();
-
-					// Create new icon.
-					destStream.Seek(0, SeekOrigin.Begin);
-					splitIcons.Add(new sd.Icon(destStream));
+					using (var destStream = new MemoryStream())
+					using (var writer = new BinaryWriter(destStream))
+					{
+						// Copy ICONDIR and ICONDIRENTRY.
+						int pos = 0;
+						writer.Write(srcBuf, pos, sICONDIR - 2);
+						writer.Write((short)1);    // ICONDIR.idCount == 1;
+
+						pos += sICONDIR;
+						pos += sICONDIRENTRY * i;
+
+						writer.Write(srcBuf, pos, sICONDIRENTRY - 4); // write out icon info (minus old offset)
+						writer.Write(sICONDIR + sICONDIRENTRY);    // write offset of icon data
+						pos += 8;
+
+						// Copy picture and mask data.
+						int imgSize = BitConverter.ToInt32(srcBuf, pos);       // ICONDIRENTRY.dwBytesInRes
+						pos += 4;
+						int imgOffset = BitConverter.ToInt32(srcBuf, pos);    // ICONDIRENTRY.dwImageOffset
+						if (imgOffset + imgSize > srcBuf.Length)
+							throw new ArgumentException("ugh");
+						writer.Write(srcBuf, imgOffset, imgSize);
+						writer.Flush();
+
+						// Create new icon.
+						destStream.Seek(0, SeekOrigin.Begin);
+						splitIcons.Add(new sd.Icon(destStream));
+					}
 				}
 			}
 
-			frames = splitIcons.Select(r => IconFrame.FromControlObject(1, r)).ToList();
-			return frames;
+			_frames = splitIcons.Select(r => IconFrame.FromControlObject(1, r)).ToList();
+			return _frames;
 		}
 
 		protected override void Dispose(bool disposing)
 		{
+			if (_destroyIcon && Control != null)
+			{
+				Win32.DestroyIcon(Control.Handle);
+			}
 			base.Dispose(disposing);
 			if (disposing)
 			{
-				if (frames != null)
+				if (_frames != null)
 				{
-					foreach (var frame in frames)
+					foreach (var frame in _frames)
 					{
 						((sd.Icon)frame.ControlObject).Dispose();
 					}
-					frames = null;
+					_frames = null;
 				}
 			}
 		}
@@ -150,15 +169,15 @@ public sd.Image GetImageWithSize(int? size)
 		{
 			if (size != null)
 			{
-				if (cachedImages == null)
-					cachedImages = new Dictionary<int, sd.Image>();
+				if (_cachedImages == null)
+					_cachedImages = new Dictionary<int, sd.Image>();
 
-				if (cachedImages.TryGetValue(size.Value, out var bmp))
+				if (_cachedImages.TryGetValue(size.Value, out var bmp))
 					return bmp;
 
 				var icon = GetIconClosestToSize(size.Value);
 				bmp = icon.ToBitmap();
-				cachedImages[size.Value] = bmp;
+				_cachedImages[size.Value] = bmp;
 				return bmp;
 			}
 			return GetIdealIcon().Bitmap.ToSD();
@@ -203,7 +222,7 @@ public sd.Icon GetIcon()
 
 		public void Create(IEnumerable<IconFrame> frames)
 		{
-			this.frames = frames.ToList();
+			this._frames = frames.ToList();
 			var frame = GetIdealIcon();
 			size = frame.Size;
 			Control = (sd.Icon)frame.ControlObject;

src/Eto.WinForms/Eto.WinForms.csproj

@@ -111,6 +111,12 @@ You do not need to use any of the classes of this assembly (unless customizing t
     <Compile Include="..\Shared\HttpClientExtensions.cs">
       <Link>HttpClientExtensions.cs</Link>
     </Compile>
+    <Compile Include="..\Eto.Wpf\Drawing\SystemIconsHandler.cs">
+      <Link>Drawing\SystemIconsHandler</Link>
+    </Compile>
+    <Compile Include="..\Eto.Wpf\ShellIcon.cs">
+      <Link>ShellIcon.cs</Link>
+    </Compile>
   </ItemGroup>
 
   <ItemGroup>