Add separate platform settings for touch.

src/Android/Avalonia.Android/AndroidPlatform.cs

@@ -29,12 +29,12 @@ namespace Avalonia
 
 namespace Avalonia.Android
 {
-    class AndroidPlatform : IPlatformSettings
+    class AndroidPlatform : ITouchPlatformSettings
     {
         public static readonly AndroidPlatform Instance = new AndroidPlatform();
         public static AndroidPlatformOptions Options { get; private set; }
-        public Size DoubleClickSize => new Size(4, 4);
+        public Size TouchDoubleClickSize => new Size(4, 4);
-        public TimeSpan DoubleClickTime => TimeSpan.FromMilliseconds(200);
+        public TimeSpan TouchDoubleClickTime => TimeSpan.FromMilliseconds(200);
 
         public static void Initialize(Type appType, AndroidPlatformOptions options)
         {
@@ -45,7 +45,7 @@ namespace Avalonia.Android
                 .Bind<ICursorFactory>().ToTransient<CursorFactory>()
                 .Bind<IWindowingPlatform>().ToConstant(new WindowingPlatformStub())
                 .Bind<IKeyboardDevice>().ToSingleton<AndroidKeyboardDevice>()
-                .Bind<IPlatformSettings>().ToConstant(Instance)
+                .Bind<ITouchPlatformSettings>().ToConstant(Instance)
                 .Bind<IPlatformThreadingInterface>().ToConstant(new AndroidThreadingInterface())
                 .Bind<ISystemDialogImpl>().ToTransient<SystemDialogImpl>()
                 .Bind<IPlatformIconLoader>().ToSingleton<PlatformIconLoaderStub>()

src/Avalonia.Input/TouchDevice.cs

@@ -58,20 +58,20 @@ namespace Avalonia.Input
                 }
                 else
                 {
-                    var settings = AvaloniaLocator.Current.GetService<IPlatformSettings>();
+                    var settings = AvaloniaLocator.Current.GetService<ITouchPlatformSettings>();
                     if (settings == null)
                     {
                         throw new Exception("IPlatformSettings can not be null.");
                     }
                     if (!_lastClickRect.Contains(args.Position)
-                        || ev.Timestamp - _lastClickTime > settings.DoubleClickTime.TotalMilliseconds)
+                        || ev.Timestamp - _lastClickTime > settings.TouchDoubleClickTime.TotalMilliseconds)
                     {
                         _clickCount = 0;
                     }
                     ++_clickCount;
                     _lastClickTime = ev.Timestamp;
                     _lastClickRect = new Rect(args.Position, new Size())
-                        .Inflate(new Thickness(16, 16));
+                        .Inflate(new Thickness(settings.TouchDoubleClickSize.Width / 2, settings.TouchDoubleClickSize.Height / 2));
                 }
 
                 target.RaiseEvent(new PointerPressedEventArgs(target, pointer,

src/Avalonia.Native/AvaloniaNativePlatform.cs

@@ -11,7 +11,7 @@ using Avalonia.Rendering;
 
 namespace Avalonia.Native
 {
-    class AvaloniaNativePlatform : IPlatformSettings, IWindowingPlatform
+    class AvaloniaNativePlatform : IPlatformSettings, ITouchPlatformSettings, IWindowingPlatform
     {
         private readonly IAvaloniaNativeFactory _factory;
         private AvaloniaNativePlatformOptions _options;
@@ -26,9 +26,13 @@ namespace Avalonia.Native
 
         public TimeSpan DoubleClickTime => TimeSpan.FromMilliseconds(500); //TODO
 
+        public Size TouchDoubleClickSize => new Size(16, 16);
+
+        public TimeSpan TouchDoubleClickTime => DoubleClickTime;
+
         public static AvaloniaNativePlatform Initialize(IntPtr factory, AvaloniaNativePlatformOptions options)
         {
-            var result =  new AvaloniaNativePlatform(MicroComRuntime.CreateProxyFor<IAvaloniaNativeFactory>(factory, true));
+            var result = new AvaloniaNativePlatform(MicroComRuntime.CreateProxyFor<IAvaloniaNativeFactory>(factory, true));
             result.DoInitialize(options);
 
             return result;
@@ -55,14 +59,14 @@ namespace Avalonia.Native
                 return Initialize(CreateAvaloniaNative(), options);
         }
 
-        public void SetupApplicationMenuExporter ()
+        public void SetupApplicationMenuExporter()
         {
             var exporter = new AvaloniaNativeMenuExporter(_factory);
         }
 
-        public void SetupApplicationName ()
+        public void SetupApplicationName()
         {
-            if(!string.IsNullOrWhiteSpace(Application.Current.Name))
+            if (!string.IsNullOrWhiteSpace(Application.Current.Name))
             {
                 _factory.MacOptions.SetApplicationTitle(Application.Current.Name);
             }
@@ -102,6 +106,7 @@ namespace Avalonia.Native
                 .Bind<IPlatformIconLoader>().ToSingleton<IconLoader>()
                 .Bind<IKeyboardDevice>().ToConstant(KeyboardDevice)
                 .Bind<IPlatformSettings>().ToConstant(this)
+                .Bind<ITouchPlatformSettings>().ToConstant(this)
                 .Bind<IWindowingPlatform>().ToConstant(this)
                 .Bind<IClipboard>().ToConstant(new ClipboardImpl(_factory.CreateClipboard()))
                 .Bind<IRenderLoop>().ToConstant(new RenderLoop())
@@ -133,7 +138,7 @@ namespace Avalonia.Native
             }
         }
 
-        public ITrayIconImpl CreateTrayIcon ()
+        public ITrayIconImpl CreateTrayIcon()
         {
             return new TrayIconImpl(_factory);
         }

src/Avalonia.Visuals/Platform/ITouchPlatformSettings.cs

@@ -0,0 +1,11 @@
+using System;
+
+namespace Avalonia.Platform
+{
+    public interface ITouchPlatformSettings
+    {
+        Size TouchDoubleClickSize { get; }
+
+        TimeSpan TouchDoubleClickTime { get; }
+    }
+}

src/Avalonia.X11/Stubs.cs

@@ -1,17 +1,15 @@
 using System;
-using System.IO;
-using System.Threading.Tasks;
-using Avalonia.Controls;
-using Avalonia.Controls.Platform;
-using Avalonia.Input;
-using Avalonia.Input.Platform;
 using Avalonia.Platform;
 
 namespace Avalonia.X11
 {
-    class PlatformSettingsStub : IPlatformSettings
+    class PlatformSettingsStub : IPlatformSettings, ITouchPlatformSettings
     {
         public Size DoubleClickSize { get; } = new Size(2, 2);
         public TimeSpan DoubleClickTime { get; } = TimeSpan.FromMilliseconds(500);
+
+        public Size TouchDoubleClickSize => new Size(16, 16);
+
+        public TimeSpan TouchDoubleClickTime => DoubleClickTime;
     }
 }

src/Avalonia.X11/X11Platform.cs

@@ -68,6 +68,7 @@ namespace Avalonia.X11
             //TODO: log
             if (options.UseDBusMenu)
                 DBusHelper.TryInitialize();
+            var platformSettingStub = new PlatformSettingsStub();
             AvaloniaLocator.CurrentMutable.BindToSelf(this)
                 .Bind<IWindowingPlatform>().ToConstant(this)
                 .Bind<IPlatformThreadingInterface>().ToConstant(new X11PlatformThreading(this))
@@ -77,7 +78,8 @@ namespace Avalonia.X11
                 .Bind<IKeyboardDevice>().ToFunc(() => KeyboardDevice)
                 .Bind<ICursorFactory>().ToConstant(new X11CursorFactory(Display))
                 .Bind<IClipboard>().ToConstant(new X11Clipboard(this))
-                .Bind<IPlatformSettings>().ToConstant(new PlatformSettingsStub())
+                .Bind<ITouchPlatformSettings>().ToConstant(platformSettingStub)
+                .Bind<IPlatformSettings>().ToConstant(platformSettingStub)
                 .Bind<IPlatformIconLoader>().ToConstant(new X11IconLoader(Info))
                 .Bind<ISystemDialogImpl>().ToConstant(new GtkSystemDialog())
                 .Bind<IMountedVolumeInfoProvider>().ToConstant(new LinuxMountedVolumeInfoProvider())

src/Windows/Avalonia.Win32/Win32Platform.cs

@@ -101,7 +101,7 @@ namespace Avalonia
 
 namespace Avalonia.Win32
 {
-    public class Win32Platform : IPlatformThreadingInterface, IPlatformSettings, IWindowingPlatform, IPlatformIconLoader, IPlatformLifetimeEventsImpl
+    public class Win32Platform : IPlatformThreadingInterface, IPlatformSettings, ITouchPlatformSettings, IWindowingPlatform, IPlatformIconLoader, IPlatformLifetimeEventsImpl
     {
         private static readonly Win32Platform s_instance = new Win32Platform();
         private static Thread _uiThread;
@@ -133,7 +133,8 @@ namespace Avalonia.Win32
             UnmanagedMethods.GetSystemMetrics(UnmanagedMethods.SystemMetric.SM_CYDOUBLECLK));
 
         public TimeSpan DoubleClickTime => TimeSpan.FromMilliseconds(UnmanagedMethods.GetDoubleClickTime());
-
+        public Size TouchDoubleClickSize => new Size(16,16);
+        public TimeSpan TouchDoubleClickTime => DoubleClickTime;
         public static void Initialize()
         {
             Initialize(new Win32PlatformOptions());
@@ -146,6 +147,7 @@ namespace Avalonia.Win32
                 .Bind<IClipboard>().ToSingleton<ClipboardImpl>()
                 .Bind<ICursorFactory>().ToConstant(CursorFactory.Instance)
                 .Bind<IKeyboardDevice>().ToConstant(WindowsKeyboardDevice.Instance)
+                .Bind<ITouchPlatformSettings>().ToConstant(s_instance)
                 .Bind<IPlatformSettings>().ToConstant(s_instance)
                 .Bind<IPlatformThreadingInterface>().ToConstant(s_instance)
                 .Bind<IRenderLoop>().ToConstant(new RenderLoop())

src/iOS/Avalonia.iOS/Platform.cs

@@ -13,10 +13,10 @@ namespace Avalonia.iOS
     {
         public static EaglFeature GlFeature;
         public static DisplayLinkTimer Timer;
-        class PlatformSettings : IPlatformSettings
+        class PlatformSettings : ITouchPlatformSettings
         {
-            public Size DoubleClickSize { get; } = new Size(10, 10);
+            public Size TouchDoubleClickSize => new Size(10, 10);
-            public TimeSpan DoubleClickTime { get; } = TimeSpan.FromMilliseconds(500);
+            public TimeSpan TouchDoubleClickTime => TimeSpan.FromMilliseconds(500);
         }
         
         public static void Register()
@@ -30,7 +30,7 @@ namespace Avalonia.iOS
                 .Bind<ICursorFactory>().ToConstant(new CursorFactoryStub())
                 .Bind<IWindowingPlatform>().ToConstant(new WindowingPlatformStub())
                 .Bind<IClipboard>().ToConstant(new ClipboardImpl())
-                .Bind<IPlatformSettings>().ToConstant(new PlatformSettings())
+                .Bind<ITouchPlatformSettings>().ToConstant(new PlatformSettings())
                 .Bind<IPlatformIconLoader>().ToConstant(new PlatformIconLoaderStub())
                 .Bind<PlatformHotkeyConfiguration>().ToSingleton<PlatformHotkeyConfiguration>()
                 .Bind<IRenderLoop>().ToSingleton<RenderLoop>()