[TextEditor] Wrappers for GTK gesture support

3 files changed, 255 insertions, 0 deletions

diff --git a/main/src/core/Mono.Texteditor/Makefile.am b/main/src/core/Mono.Texteditor/Makefile.am
index d975e28bf5..f98745d549 100644
--- a/main/src/core/Mono.Texteditor/Makefile.am
+++ b/main/src/core/Mono.Texteditor/Makefile.am
@@ -110,6 +110,7 @@ FILES =  \
 	Mono.TextEditor/Gui/DashedLineMargin.cs \
 	Mono.TextEditor/Gui/FoldingScreenbackgroundRenderer.cs \
 	Mono.TextEditor/Gui/FoldMarkerMargin.cs \
+	Mono.TextEditor/Gui/GtkGestures.cs \
 	Mono.TextEditor/Gui/GtkWorkarounds.cs \
 	Mono.TextEditor/Gui/GutterMargin.cs \
 	Mono.TextEditor/Gui/HslColor.cs \
diff --git a/main/src/core/Mono.Texteditor/Mono.TextEditor.csproj b/main/src/core/Mono.Texteditor/Mono.TextEditor.csproj
index 55853d9690..47a22b0dbf 100644
--- a/main/src/core/Mono.Texteditor/Mono.TextEditor.csproj
+++ b/main/src/core/Mono.Texteditor/Mono.TextEditor.csproj
@@ -202,6 +202,7 @@
     <Compile Include="Mono.TextEditor\Standalone\ITextAnchor.cs" />
     <Compile Include="Mono.TextEditor\Standalone\TextLocation.cs" />
     <Compile Include="Mono.TextEditor.Utils\RtfWriter.cs" />
+    <Compile Include="Mono.TextEditor\Gui\GtkGestures.cs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="Mono.TextEditor.dll.config">
diff --git a/main/src/core/Mono.Texteditor/Mono.TextEditor/Gui/GtkGestures.cs b/main/src/core/Mono.Texteditor/Mono.TextEditor/Gui/GtkGestures.cs
new file mode 100644
index 0000000000..a37c5d642a
--- /dev/null
+++ b/main/src/core/Mono.Texteditor/Mono.TextEditor/Gui/GtkGestures.cs
@@ -0,0 +1,253 @@
+//
+// GtkGestures.cs
+//
+// Author:
+//       Michael Hutchinson <mhutch@xamarin.com>
+//
+// Copyright (c) 2012 Xamarin Inc. (http://xamarin.com)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+using System;
+using System.Runtime.InteropServices;
+using Gdk;
+
+namespace Mono.TextEditor
+{
+	public static class GtkGestures
+	{
+		const int GDK_GESTURE_MAGNIFY = 37;
+		const int GDK_GESTURE_ROTATE  = 38;
+		const int GDK_GESTURE_SWIPE   = 39;
+
+		[DllImport (PangoUtil.LIBGDK)]
+		static extern bool gdk_quartz_supports_gesture_events ();
+
+		static bool isSupported;
+
+		static GtkGestures ()
+		{
+			if (Platform.IsMac) {
+				try {
+					isSupported = gdk_quartz_supports_gesture_events ();
+					Console.WriteLine (isSupported);
+				} catch (DllNotFoundException) {
+				}
+			}
+		}
+
+		public static bool IsSupported { get { return isSupported; } }
+
+		public static void AddGestureMagnifyHandler (this Gtk.Widget widget, EventHandler<GestureMagnifyEventArgs> handler)
+		{
+			if (!isSupported)
+				throw new NotSupportedException ();
+			var signal = GLib.Signal.Lookup (widget, "gesture-magnify-event", typeof(GestureMagnifyEventArgs));
+			signal.AddDelegate (new EventHandler<GestureMagnifyEventArgs> (handler));
+		}
+
+		public static void AddGestureRotateHandler (this Gtk.Widget widget, EventHandler<GestureRotateEventArgs> handler)
+		{
+			if (!isSupported)
+				throw new NotSupportedException ();
+			var signal = GLib.Signal.Lookup (widget, "gesture-rotate-event", typeof(GestureRotateEventArgs));
+			signal.AddDelegate (new EventHandler<GestureRotateEventArgs> (handler));
+		}
+
+		public static void AddGestureSwipeHandler (this Gtk.Widget widget, EventHandler<GestureSwipeEventArgs> handler)
+		{
+			if (!isSupported)
+				throw new NotSupportedException ();
+			var signal = GLib.Signal.Lookup (widget, "gesture-swipe-event", typeof(GestureSwipeEventArgs));
+			signal.AddDelegate (new EventHandler<GestureSwipeEventArgs> (handler));
+		}
+	}
+
+	public unsafe class GestureMagnifyEventArgs : GLib.SignalArgs
+	{
+		//have to force pack=4, or Mono aligns doubles to 8 bytes
+		[StructLayout (LayoutKind.Sequential, Pack=4)]
+		struct GdkEventGestureMagnify
+		{
+			public Gdk.EventType type;
+			public IntPtr window;
+			public sbyte send_event;
+			public uint time;
+			public double x, y;
+			public uint state;
+			public double magnification;
+			public IntPtr device;
+			public double x_root, y_root;
+		}
+
+		// I tried to mimic the GTK# pattern of having a subclassed Event object on the EventArgs, but I gave up on
+		// figuring out how to get GTK# to marshal the event to a custom GestureMagnifyEvent class. Instead we just
+		// lift all the accessors up to the args class and dereference the handle directly.
+		GdkEventGestureMagnify *evt {
+			get {
+				var handle = ((Event)Args[0]).Handle;
+				return (GdkEventGestureMagnify *) handle;
+			}
+		}
+
+		public Gdk.Window Window {
+			get {
+				return (Gdk.Window) GLib.Object.GetObject (evt->window);
+			}
+		}
+
+		public Device Device {
+			get {
+				return (Device) GLib.Object.GetObject (evt->device);
+			}
+		}
+
+		public uint Time { get { return evt->time; } }
+		public double X { get { return evt->x; } }
+		public double Y { get { return evt->y; } }
+		public ModifierType State { get { return (ModifierType) evt->state; } }
+		public double Magnification { get { return evt->magnification; } }
+		public double XRoot { get { return evt->x_root; } }
+		public double YRoot { get { return evt->y_root; } }
+	}
+
+	public unsafe class GestureRotateEventArgs : GLib.SignalArgs
+	{
+		[StructLayout (LayoutKind.Sequential, Pack=4)]
+		struct GdkEventGestureRotate
+		{
+			public Gdk.EventType type;
+			public IntPtr window;
+			public sbyte send_event;
+			public uint time;
+			public double x, y;
+			public uint state;
+			public double rotation;
+			public IntPtr device;
+			public double x_root, y_root;
+		}
+
+		GdkEventGestureRotate *evt {
+			get {
+				var handle = ((Event)Args[0]).Handle;
+				return (GdkEventGestureRotate *) handle;
+			}
+		}
+
+		public Gdk.Window Window {
+			get {
+				return (Gdk.Window) GLib.Object.GetObject (evt->window);
+			}
+		}
+
+		public Device Device {
+			get {
+				return (Device) GLib.Object.GetObject (evt->device);
+			}
+		}
+
+		public uint Time { get { return evt->time; } }
+		public double X { get { return evt->x; } }
+		public double Y { get { return evt->y; } }
+		public ModifierType State { get { return (ModifierType) evt->state; } }
+		public double Rotation { get { return evt->rotation; } }
+		public double XRoot { get { return evt->x_root; } }
+		public double YRoot { get { return evt->y_root; } }
+	}
+
+	public unsafe class GestureSwipeEventArgs : GLib.SignalArgs
+	{
+		[StructLayout (LayoutKind.Sequential, Pack=4)]
+		struct GdkEventGestureSwipe
+		{
+			public Gdk.EventType type;
+			public IntPtr window;
+			public sbyte send_event;
+			public uint time;
+			public double x, y;
+			public uint state;
+			public double delta_x, delta_y;
+			public IntPtr device;
+			public double x_root, y_root;
+		}
+
+		GdkEventGestureSwipe *evt {
+			get {
+				var handle = ((Event)Args[0]).Handle;
+				return (GdkEventGestureSwipe *) handle;
+			}
+		}
+
+		public Gdk.Window Window {
+			get {
+				return (Gdk.Window) GLib.Object.GetObject (evt->window);
+			}
+		}
+
+		public Device Device {
+			get {
+				return (Device) GLib.Object.GetObject (evt->device);
+			}
+		}
+
+		public uint Time { get { return evt->time; } }
+		public double X { get { return evt->x; } }
+		public double Y { get { return evt->y; } }
+		public ModifierType State { get { return (ModifierType) evt->state; } }
+		public double DeltaX { get { return evt->delta_x; } }
+		public double DeltaY { get { return evt->delta_y; } }
+		public double XRoot { get { return evt->x_root; } }
+		public double YRoot { get { return evt->y_root; } }
+	}
+
+	/*
+	void PrintOffsets ()
+	{
+		GdkEventGestureMagnify *v = (GdkEventGestureMagnify *)0;
+		Console.WriteLine ("type          {0}", (int)&(v->type));
+		Console.WriteLine ("window        {0}", (int)&(v->window));
+		Console.WriteLine ("send_event    {0}", (int)&(v->send_event));
+		Console.WriteLine ("time          {0}", (int)&(v->time));
+		Console.WriteLine ("x             {0}", (int)&(v->x));
+		Console.WriteLine ("y             {0}", (int)&(v->y));
+		Console.WriteLine ("state         {0}", (int)&(v->state));
+		Console.WriteLine ("magnification {0}", (int)&(v->magnification));
+		Console.WriteLine ("x_root        {0}", (int)&(v->x_root));
+		Console.WriteLine ("y_root        {0}", (int)&(v->y_root));
+	}
+
+	// gcc -m32 test.c `pkg-config --cflags gtk+-2.0`
+	#include <gtk/gtk.h>
+
+	int main (int argc, char* argv)
+	{
+		GdkEventGestureMagnify *v = (GdkEventGestureMagnify *)0;
+		printf ("type          %d\n", (int)&(v->type));
+		printf ("window        %d\n", (int)&(v->window));
+		printf ("send_event    %d\n", (int)&(v->send_event));
+		printf ("time          %d\n", (int)&(v->time));
+		printf ("x             %d\n", (int)&(v->x));
+		printf ("y             %d\n", (int)&(v->y));
+		printf ("state         %d\n", (int)&(v->state));
+		printf ("magnification %d\n", (int)&(v->magnification));
+		printf ("x_root        %d\n", (int)&(v->x_root));
+		printf ("y_root        %d\n", (int)&(v->y_root));
+	}
+	*/
+}
\ No newline at end of file