Merge pull request #797 from jkoritzinsky/Save-WindowIcon

Added a method to save an icon to a stream. This enables the scenario…

src/Android/Avalonia.Android/AndroidPlatform.cs

@@ -25,7 +25,7 @@ namespace Avalonia
 
 namespace Avalonia.Android
 {
-    public class AndroidPlatform : IPlatformSettings, IWindowingPlatform, IPlatformIconLoader
+    public class AndroidPlatform : IPlatformSettings, IWindowingPlatform
     {
         public static readonly AndroidPlatform Instance = new AndroidPlatform();
         public Size DoubleClickSize => new Size(4, 4);
@@ -50,7 +50,8 @@ namespace Avalonia.Android
                 .Bind<IPlatformSettings>().ToConstant(Instance)
                 .Bind<IPlatformThreadingInterface>().ToConstant(new AndroidThreadingInterface())
                 .Bind<ISystemDialogImpl>().ToTransient<SystemDialogImpl>()
-                .Bind<IWindowingPlatform>().ToConstant(Instance);
+                .Bind<IWindowingPlatform>().ToConstant(Instance)
+                .Bind<IPlatformIconLoader>().ToSingleton<PlatformIconLoader>();
 
             SkiaPlatform.Initialize();
         }
@@ -74,20 +75,5 @@ namespace Avalonia.Android
         {
             throw new NotImplementedException();
         }
-
-        public IWindowIconImpl LoadIcon(string fileName)
-        {
-            return null;
-        }
-
-        public IWindowIconImpl LoadIcon(Stream stream)
-        {
-            return null;
-        }
-
-        public IWindowIconImpl LoadIcon(IBitmapImpl bitmap)
-        {
-            return null;
-        }
     }
 }

src/Android/Avalonia.Android/Avalonia.Android.csproj

@@ -63,6 +63,7 @@
   <ItemGroup>
     <Compile Include="AndroidPlatform.cs" />
     <Compile Include="AndroidThreadingInterface.cs" />
+    <Compile Include="PlatformIconLoader.cs" />
     <Compile Include="Platform\ClipboardImpl.cs" />
     <Compile Include="CursorFactory.cs" />
     <Compile Include="Platform\Input\AndroidKeyboardDevice.cs" />

src/Android/Avalonia.Android/PlatformIconLoader.cs

@@ -0,0 +1,59 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+using Android.App;
+using Android.Content;
+using Android.OS;
+using Android.Runtime;
+using Android.Views;
+using Android.Widget;
+using Avalonia.Platform;
+using System.IO;
+
+namespace Avalonia.Android
+{
+    class PlatformIconLoader : IPlatformIconLoader
+    {
+        public IWindowIconImpl LoadIcon(IBitmapImpl bitmap)
+        {
+            using (var stream = new MemoryStream())
+            {
+                bitmap.Save(stream);
+                return LoadIcon(stream);
+            }
+        }
+
+        public IWindowIconImpl LoadIcon(Stream stream)
+        {
+            return new FakeIcon(stream);
+        }
+
+        public IWindowIconImpl LoadIcon(string fileName)
+        {
+            using (var file = File.Open(fileName, FileMode.Open))
+            {
+                return new FakeIcon(file);
+            }
+        }
+    }
+
+    // Stores the icon created as a stream to support saving even though an icon is never shown
+    public class FakeIcon : IWindowIconImpl
+    {
+        private Stream stream = new MemoryStream();
+
+        public FakeIcon(Stream stream)
+        {
+            stream.CopyTo(this.stream);
+        }
+
+        public Stream Save()
+        {
+            var returnStream = new MemoryStream();
+            stream.CopyTo(returnStream);
+            return returnStream;
+        }
+    }
+}

src/Avalonia.Controls/Platform/IWindowIconImpl.cs

@@ -1,9 +1,12 @@
 // Copyright (c) The Avalonia Project. All rights reserved.
 // Licensed under the MIT license. See licence.md file in the project root for full license information.
 
+using System.IO;
+
 namespace Avalonia.Platform
 {
     public interface IWindowIconImpl
     {
+        Stream Save();
     }
 }

src/Avalonia.Controls/WindowIcon.cs

@@ -30,5 +30,7 @@ namespace Avalonia.Controls
         }
 
         public IWindowIconImpl PlatformImpl { get; }
+
+        public Stream Save() => PlatformImpl.Save();
     }
 }

src/Gtk/Avalonia.Gtk/IconImpl.cs

@@ -5,6 +5,7 @@ using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 using Gdk;
+using System.IO;
 
 namespace Avalonia.Gtk
 {
@@ -16,5 +17,10 @@ namespace Avalonia.Gtk
         }
 
         public Pixbuf Pixbuf { get; }
+
+        public Stream Save()
+        {
+            return new MemoryStream(Pixbuf.SaveToBuffer("png"));
+        }
     }
 }

src/Windows/Avalonia.Win32/IconImpl.cs

@@ -5,6 +5,8 @@ using System.Drawing;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
+using System.IO;
+using System.Drawing.Imaging;
 
 namespace Avalonia.Win32
 {
@@ -24,5 +26,19 @@ namespace Avalonia.Win32
         }
 
         public IntPtr HIcon => icon?.Handle ?? bitmap.GetHicon();
+
+        public Stream Save()
+        {
+            var stream = new MemoryStream();
+            if (icon != null)
+            {
+                icon.Save(stream);
+            }
+            else
+            {
+                bitmap.Save(stream, ImageFormat.Png);
+            }
+            return stream;
+        }
     }
 }

src/iOS/Avalonia.iOS/PlatformIconLoader.cs

@@ -1,7 +1,4 @@
 using Avalonia.Platform;
-using System;
-using System.Collections.Generic;
-using System.Text;
 using System.IO;
 
 namespace Avalonia.iOS
@@ -10,17 +7,42 @@ namespace Avalonia.iOS
     {
         public IWindowIconImpl LoadIcon(IBitmapImpl bitmap)
         {
-            return null;
+            using (var stream = new MemoryStream())
+            {
+                bitmap.Save(stream);
+                return LoadIcon(stream);
+            }
         }
 
         public IWindowIconImpl LoadIcon(Stream stream)
         {
-            return null;
+            return new FakeIcon(stream);
         }
 
         public IWindowIconImpl LoadIcon(string fileName)
         {
-            return null;
+            using (var file = File.Open(fileName, FileMode.Open))
+            {
+                return new FakeIcon(file);
+            }
+        }
+    }
+
+    // Stores the icon created as a stream to support saving even though an icon is never shown
+    public class FakeIcon : IWindowIconImpl
+    {
+        private Stream stream = new MemoryStream();
+
+        public FakeIcon(Stream stream)
+        {
+            stream.CopyTo(this.stream);
+        }
+
+        public Stream Save()
+        {
+            var returnStream = new MemoryStream();
+            stream.CopyTo(returnStream);
+            return returnStream;
         }
     }
 }