[gtk+/events-refactor: 320/1085] Added the GdkEventTranslator interface.

[Carlos Garnacho <carlosg src gnome org>]

commit 8e721ff8948f4f43e412fc8abd2f59bea53081cf
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed May 20 01:17:51 2009 +0200

    Added the GdkEventTranslator interface.

 gdk/x11/Makefile.am          |    2 +
 gdk/x11/gdkeventtranslator.c |   63 ++++++++++++++++++++++++++++++++++++++++++
 gdk/x11/gdkeventtranslator.h |   54 ++++++++++++++++++++++++++++++++++++
 3 files changed, 119 insertions(+), 0 deletions(-)
---
diff --git a/gdk/x11/Makefile.am b/gdk/x11/Makefile.am
index d5bbf0c..60c2adc 100644
--- a/gdk/x11/Makefile.am
+++ b/gdk/x11/Makefile.am
@@ -30,6 +30,8 @@ libgdk_x11_la_SOURCES =    	\
 	gdkdrawable-x11.c  	\
 	gdkdrawable-x11.h	\
 	gdkevents-x11.c	   	\
+	gdkeventtranslator.c	\
+	gdkeventtranslator.h	\
 	gdkfont-x11.c	   	\
 	gdkgc-x11.c 	   	\
 	gdkgeometry-x11.c  	\
diff --git a/gdk/x11/gdkeventtranslator.c b/gdk/x11/gdkeventtranslator.c
new file mode 100644
index 0000000..6090a4e
--- /dev/null
+++ b/gdk/x11/gdkeventtranslator.c
@@ -0,0 +1,63 @@
+/* GDK - The GIMP Drawing Kit
+ * Copyright (C) 2009 Carlos Garnacho <carlosg gnome org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "gdkeventtranslator.h"
+
+GType
+gdk_event_translator_get_type (void)
+{
+  static GType translator_type = 0;
+
+  if (G_UNLIKELY (!translator_type))
+    {
+      translator_type = g_type_register_static_simple (G_TYPE_INTERFACE,
+                                                       g_intern_static_string ("GdkEventTranslator"),
+                                                       sizeof (GdkEventTranslatorIface),
+                                                       NULL, 0, NULL, 0);
+
+      g_type_interface_add_prerequisite (translator_type, G_TYPE_OBJECT);
+    }
+
+  return translator_type;
+}
+
+GdkEvent *
+gdk_event_translator_translate (GdkEventTranslator *translator,
+                                GdkDisplay         *display,
+                                XEvent             *xevent)
+{
+  GdkEventTranslatorIface *iface;
+  GdkEvent *event;
+
+  g_return_val_if_fail (GDK_IS_EVENT_TRANSLATOR (translator), NULL);
+  g_return_val_if_fail (GDK_IS_DISPLAY (display), NULL);
+
+  iface = GDK_EVENT_TRANSLATOR_GET_IFACE (translator);
+  if (!iface->translate_event)
+    return NULL;
+
+  event = gdk_event_new (GDK_NOTHING);
+
+  if ((iface->translate_event) (translator, display, event, xevent))
+    return event;
+
+  gdk_event_free (event);
+
+  return NULL;
+}
diff --git a/gdk/x11/gdkeventtranslator.h b/gdk/x11/gdkeventtranslator.h
new file mode 100644
index 0000000..10a96cf
--- /dev/null
+++ b/gdk/x11/gdkeventtranslator.h
@@ -0,0 +1,54 @@
+/* GDK - The GIMP Drawing Kit
+ * Copyright (C) 2009 Carlos Garnacho <carlosg gnome org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __GDK_EVENT_TRANSLATOR_H__
+#define __GDK_EVENT_TRANSLATOR_H__
+
+#include <gdk/gdktypes.h>
+#include <gdk/gdkdisplay.h>
+#include "gdkprivate-x11.h"
+
+G_BEGIN_DECLS
+
+#define GDK_TYPE_EVENT_TRANSLATOR         (gdk_event_translator_get_type ())
+#define GDK_EVENT_TRANSLATOR(o)           (G_TYPE_CHECK_INSTANCE_CAST ((o), GDK_TYPE_EVENT_TRANSLATOR, GdkEventTranslator))
+#define GDK_IS_EVENT_TRANSLATOR(o)        (G_TYPE_CHECK_INSTANCE_TYPE ((o), GDK_TYPE_EVENT_TRANSLATOR))
+#define GDK_EVENT_TRANSLATOR_GET_IFACE(o) (G_TYPE_INSTANCE_GET_CLASS  ((o), GDK_TYPE_EVENT_TRANSLATOR, GdkEventTranslatorIface))
+
+typedef struct _GdkEventTranslatorIface GdkEventTranslatorIface;
+typedef struct _GdkEventTranslator GdkEventTranslator; /* Dummy typedef */
+
+struct _GdkEventTranslatorIface
+{
+  GTypeInterface iface;
+
+  /* VMethods */
+  gboolean (* translate_event) (GdkEventTranslator *translator,
+                                GdkDisplay         *display,
+                                GdkEvent           *event,
+                                XEvent             *xevent);
+};
+
+GdkEvent * gdk_event_translator_translate (GdkEventTranslator *translator,
+                                           GdkDisplay         *display,
+                                           XEvent             *xevent);
+
+G_END_DECLS
+
+#endif /* __GDK_EVENT_TRANSLATOR_H__ */