[gtk+] Add some more GdkEvent getters

[Carlos Garnacho <carlosg src gnome org>]

commit 7306f559121daaa393c2d5447d9b26c4a11ce03d
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Aug 28 18:47:35 2017 -0400

    Add some more GdkEvent getters

 gdk/gdkevents.c |   33 +++++++++++++++++++++++++++++++++
 gdk/gdkevents.h |    6 ++++--
 2 files changed, 37 insertions(+), 2 deletions(-)
---
diff --git a/gdk/gdkevents.c b/gdk/gdkevents.c
index 72c2cbb..ce5f7c6 100644
--- a/gdk/gdkevents.c
+++ b/gdk/gdkevents.c
@@ -3061,3 +3061,36 @@ gdk_event_set_selection (GdkEvent  *event,
   event->selection.selection = selection;
   event->selection.time = time;
 }
+
+gboolean
+gdk_event_get_axes (GdkEvent  *event,
+                    gdouble  **axes,
+                    guint     *n_axes)
+{
+  GdkDevice *source_device;
+
+  if (!event)
+    return FALSE;
+
+  source_device = gdk_event_get_source_device (event);
+
+  if (!source_device)
+    return FALSE;
+
+  if (event->type == GDK_MOTION_NOTIFY)
+    {
+      *axes = event->motion.axes;
+      *n_axes = gdk_device_get_n_axes (source_device);
+      return TRUE;
+    }
+  else if (event->type == GDK_BUTTON_PRESS ||
+           event->type == GDK_BUTTON_RELEASE)
+    {
+      *axes = event->button.axes;
+      *n_axes = gdk_device_get_n_axes (source_device);
+      return TRUE;
+    }
+
+  return FALSE;
+}
+
diff --git a/gdk/gdkevents.h b/gdk/gdkevents.h
index fc158f7..320ede6 100644
--- a/gdk/gdkevents.h
+++ b/gdk/gdkevents.h
@@ -819,8 +819,10 @@ void           gdk_event_set_selection (GdkEvent  *event,
                                         GdkWindow *window,
                                         GdkAtom    selection,
                                         guint32    time);
-
-
+GDK_AVAILABLE_IN_3_92
+gboolean       gdk_event_get_axes      (GdkEvent  *event,
+                                        gdouble  **axes,
+                                        guint     *n_axes);
 
 G_END_DECLS