GTK# implementation

Directory.Build.props

@@ -6,7 +6,10 @@
     <DefineConstants>$(DefineConstants);NETSTANDARD1_1;NETSTANDARD</DefineConstants>
   </PropertyGroup>
   <PropertyGroup Condition="'$(TargetFramework)' == 'net40'">
-    <DefineConstants>$(DefineConstants);NET40</DefineConstants>
+    <DefineConstants>$(DefineConstants);NET40;NET</DefineConstants>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(TargetFramework)' == 'net471'">
+    <DefineConstants>$(DefineConstants);NET471;NET</DefineConstants>
   </PropertyGroup>
   <PropertyGroup Condition="'$(TargetFramework)' == 'uap10.0.16299'">
     <DefineConstants>$(DefineConstants);NETFX_CORE;XAML;WINDOWS_UWP;WINDOWS</DefineConstants>

LibVLCSharp.Forms.Platforms.GTK/LibVLCSharp.Forms.Platforms.GTK.csproj

@@ -0,0 +1,37 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net47</TargetFramework>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Xamarin.Forms.Platform.GTK" Version="3.2.0.871581" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\LibVLCSharp.Forms\LibVLCSharp.Forms.csproj" />
+    <ProjectReference Include="..\LibVLCSharp.GTK\LibVLCSharp.GTK.csproj" />
+  </ItemGroup>
+  <ItemGroup>
+    <Reference Include="gdk-sharp">
+      <SpecificVersion>False</SpecificVersion>
+      <HintPath Condition="$([MSBuild]::IsOsPlatform('Windows'))">C:\Program Files (x86)\GtkSharp\2.12\lib\gtk-sharp-2.0\gdk-sharp.dll</HintPath>
+      <HintPath Condition="$([MSBuild]::IsOsPlatform('Linux'))">/usr/lib/cli/gdk-sharp-2.0/gdk-sharp.dll</HintPath>
+      <HintPath Condition="$([MSBuild]::IsOsPlatform('OSX'))">/Library/Frameworks/Mono.framework//Versions/5.12.0/lib/mono/gtk-sharp-2.0/gdk-sharp.dll</HintPath>
+      <Private>False</Private>
+    </Reference>
+    <Reference Include="glib-sharp">
+      <SpecificVersion>False</SpecificVersion>
+      <Private>False</Private>
+      <HintPath Condition="$([MSBuild]::IsOsPlatform('Windows'))">C:\Program Files (x86)\GtkSharp\2.12\lib\gtk-sharp-2.0\glib-sharp.dll</HintPath>
+      <HintPath Condition="$([MSBuild]::IsOsPlatform('Linux'))">/usr/lib/cli/glib-sharp-2.0/glib-sharp.dll</HintPath>
+      <HintPath Condition="$([MSBuild]::IsOsPlatform('OSX'))">/Library/Frameworks/Mono.framework//Versions/5.12.0/lib/mono/gtk-sharp-2.0/glib-sharp.dll</HintPath>
+    </Reference>
+    <Reference Include="gtk-sharp">
+      <SpecificVersion>False</SpecificVersion>
+      <Private>False</Private>
+      <HintPath Condition="$([MSBuild]::IsOsPlatform('Windows'))">C:\Program Files (x86)\GtkSharp\2.12\lib\gtk-sharp-2.0\gtk-sharp.dll</HintPath>
+      <HintPath Condition="$([MSBuild]::IsOsPlatform('Linux'))">/usr/lib/cli/gtk-sharp-2.0/gtk-sharp.dll</HintPath>
+      <HintPath Condition="$([MSBuild]::IsOsPlatform('OSX'))">/Library/Frameworks/Mono.framework//Versions/5.12.0/lib/mono/gtk-sharp-2.0/gtk-sharp.dll</HintPath>
+    </Reference>
+  </ItemGroup>
+
+</Project>

LibVLCSharp.Forms.Platforms.GTK/VideoViewRenderer.cs

@@ -0,0 +1,51 @@
+using LibVLCSharp.Forms.Platforms.GTK;
+using LibVLCSharp.Forms.Shared;
+using LibVLCSharp.Shared;
+using Xamarin.Forms;
+using Xamarin.Forms.Platform.GTK;
+
+[assembly: ExportRenderer(typeof(LibVLCSharp.Forms.Shared.VideoView), typeof(VideoViewRenderer))]
+namespace LibVLCSharp.Forms.Platforms.GTK
+{
+    public class VideoViewRenderer : ViewRenderer<LibVLCSharp.Forms.Shared.VideoView, LibVLCSharp.GTK.VideoView>
+    {
+        LibVLCSharp.GTK.VideoView _videoView;
+
+        protected override void OnElementChanged(ElementChangedEventArgs<VideoView> e)
+        {
+            base.OnElementChanged(e);
+
+            if (Control == null)
+            {
+                _videoView = new LibVLCSharp.GTK.VideoView();
+                SetNativeControl(_videoView);
+            }
+
+            if (e.OldElement != null)
+            {
+                e.OldElement.MediaPlayerChanged -= OnMediaPlayerChanged;
+            }
+
+            if (e.NewElement != null)
+            {
+                e.NewElement.MediaPlayerChanged += OnMediaPlayerChanged;
+            }
+        }
+
+        private void OnMediaPlayerChanged(object sender, MediaPlayerChangedEventArgs e)
+        {
+            if (Control == null)
+            {
+                return;
+            }
+            Control.MediaPlayer = e.NewMediaPlayer;
+        }
+
+        protected override void Dispose(bool disposing)
+        {
+            base.Dispose(disposing);
+
+            _videoView?.Dispose();
+        }
+    }
+}

LibVLCSharp.GTK/LibVLCSharp.GTK.csproj

@@ -0,0 +1,33 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net47</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Reference Include="gdk-sharp">
+      <SpecificVersion>False</SpecificVersion>
+      <HintPath Condition="$([MSBuild]::IsOsPlatform('Windows'))">C:\Program Files (x86)\GtkSharp\2.12\lib\gtk-sharp-2.0\gdk-sharp.dll</HintPath>
+      <HintPath Condition="$([MSBuild]::IsOsPlatform('Linux'))">/usr/lib/cli/gdk-sharp-2.0/gdk-sharp.dll</HintPath>
+      <HintPath Condition="$([MSBuild]::IsOsPlatform('OSX'))">/Library/Frameworks/Mono.framework//Versions/5.12.0/lib/mono/gtk-sharp-2.0/gdk-sharp.dll</HintPath>
+      <Private>False</Private>
+    </Reference>
+    <Reference Include="glib-sharp">
+      <SpecificVersion>False</SpecificVersion>
+      <Private>False</Private>
+      <HintPath Condition="$([MSBuild]::IsOsPlatform('Windows'))">C:\Program Files (x86)\GtkSharp\2.12\lib\gtk-sharp-2.0\glib-sharp.dll</HintPath>
+      <HintPath Condition="$([MSBuild]::IsOsPlatform('Linux'))">/usr/lib/cli/glib-sharp-2.0/glib-sharp.dll</HintPath>
+      <HintPath Condition="$([MSBuild]::IsOsPlatform('OSX'))">/Library/Frameworks/Mono.framework//Versions/5.12.0/lib/mono/gtk-sharp-2.0/glib-sharp.dll</HintPath>
+    </Reference>
+    <Reference Include="gtk-sharp">
+      <SpecificVersion>False</SpecificVersion>
+      <Private>False</Private>
+      <HintPath Condition="$([MSBuild]::IsOsPlatform('Windows'))">C:\Program Files (x86)\GtkSharp\2.12\lib\gtk-sharp-2.0\gtk-sharp.dll</HintPath>
+      <HintPath Condition="$([MSBuild]::IsOsPlatform('Linux'))">/usr/lib/cli/gtk-sharp-2.0/gtk-sharp.dll</HintPath>
+      <HintPath Condition="$([MSBuild]::IsOsPlatform('OSX'))">/Library/Frameworks/Mono.framework//Versions/5.12.0/lib/mono/gtk-sharp-2.0/gtk-sharp.dll</HintPath>
+    </Reference>
+    <ProjectReference Include="..\LibVLCSharp\LibVLCSharp.csproj" />
+    <PackageReference Include="System.Runtime.InteropServices.RuntimeInformation" Version="4.3.0" />
+  </ItemGroup>
+
+</Project>

LibVLCSharp.GTK/VideoView.cs

@@ -0,0 +1,122 @@
+using System;
+using System.Runtime.InteropServices;
+using Gdk;
+using Gtk;
+using LibVLCSharp.Shared;
+
+namespace LibVLCSharp.GTK
+{
+    public class VideoView : DrawingArea, IVideoView
+    {
+        struct Native
+        {
+            /// <summary>
+            /// Gets the window's HWND
+            /// </summary>
+            /// <remarks>Window only</remarks>
+            /// <param name="gdkWindow">The pointer to the GdkWindow object</param>
+            /// <returns>The window's HWND</returns>
+            [DllImport("libgdk-win32-2.0-0.dll", CallingConvention = CallingConvention.Cdecl)]
+            internal static extern IntPtr gdk_win32_drawable_get_handle(IntPtr gdkWindow);
+
+            /// <summary>
+            /// Gets the window's XID
+            /// </summary>
+            /// <remarks>Linux X11 only</remarks>
+            /// <param name="gdkWindow">The pointer to the GdkWindow object</param>
+            /// <returns>The window's XID</returns>
+            [DllImport("libgdk-x11-2.0.so.0", CallingConvention = CallingConvention.Cdecl)]
+            internal static extern uint gdk_x11_drawable_get_xid(IntPtr gdkWindow);
+
+            [DllImport("libgdk-quartz-2.0.0.dylib")]
+            internal static extern IntPtr gdk_quartz_window_get_nsview(IntPtr handle);
+        }
+
+        private MediaPlayer _mediaPlayer;
+
+        public VideoView(MediaPlayer mediaPlayer = null)
+        {
+            _mediaPlayer = mediaPlayer;
+            Color black = Color.Zero;
+            Color.Parse("black", ref black);
+            ModifyBg(StateType.Normal, black);
+
+            Realized += (s, e) => Attach();
+        }
+
+        public MediaPlayer MediaPlayer
+        {
+            get
+            {
+                return _mediaPlayer;
+            }
+            set
+            {
+                if (ReferenceEquals(_mediaPlayer, value))
+                {
+                    return;
+                }
+
+                Detach();
+                _mediaPlayer = value;
+                Attach();
+            }
+        }
+
+        void Attach()
+        {
+            if (!IsRealized || _mediaPlayer == null)
+            {
+                return;
+            }
+
+            if (PlatformHelper.IsWindows)
+            {
+                MediaPlayer.Hwnd = Native.gdk_win32_drawable_get_handle(GdkWindow.Handle);
+            }
+            else if (PlatformHelper.IsLinux)
+            {
+                MediaPlayer.XWindow = Native.gdk_x11_drawable_get_xid(GdkWindow.Handle);
+            }
+            else if (PlatformHelper.IsMac)
+            {
+                MediaPlayer.NsObject = Native.gdk_quartz_window_get_nsview(GdkWindow.Handle);
+            }
+            else
+            {
+                throw new PlatformNotSupportedException();
+            }
+        }
+
+        void Detach()
+        {
+            if (!IsRealized || _mediaPlayer == null)
+            {
+                return;
+            }
+
+            if (PlatformHelper.IsWindows)
+            {
+                MediaPlayer.Hwnd = IntPtr.Zero;
+            }
+            else if (PlatformHelper.IsLinux)
+            {
+                MediaPlayer.XWindow = 0;
+            }
+            else if (PlatformHelper.IsMac)
+            {
+                MediaPlayer.NsObject = IntPtr.Zero;
+            }
+            else
+            {
+                throw new PlatformNotSupportedException();
+            }
+        }
+
+        public override void Dispose()
+        {
+            Detach();
+            base.Dispose();
+        }
+    }
+}