[gtk+/wip/carlosg/event-delivery: 70/104] gdk: Make it possible to attach user data to GdkEvents

[Carlos Garnacho <carlosg src gnome org>]

commit 65de0ebea3d2656b75ffcb41fd6ce2be1aaa01a2
Author: Carlos Garnacho <carlosg gnome org>
Date:   Thu May 4 13:41:29 2017 +0200

    gdk: Make it possible to attach user data to GdkEvents
    
    As event->any.window is the toplevel, this is not useful anymore to
    determine the window/widget that is the target for this event. Add
    helper functions to attach user data to GdkEvents so the target
    widget can be stored on the gtk/ side.
    
    These calls should be made private with the rest of GdkEvent related
    API.

 gdk/gdkevents.c    |   26 ++++++++++++++++++++++++++
 gdk/gdkevents.h    |    6 ++++++
 gdk/gdkinternals.h |    2 ++
 3 files changed, 34 insertions(+), 0 deletions(-)
---
diff --git a/gdk/gdkevents.c b/gdk/gdkevents.c
index ca72b9c..a3512b0 100644
--- a/gdk/gdkevents.c
+++ b/gdk/gdkevents.c
@@ -663,6 +663,7 @@ gdk_event_copy (const GdkEvent *event)
       new_private->source_device = private->source_device ? g_object_ref (private->source_device) : NULL;
       new_private->seat = private->seat;
       new_private->tool = private->tool;
+      g_set_object (&new_private->user_data, private->user_data);
     }
 
   switch (event->any.type)
@@ -2577,3 +2578,28 @@ gdk_event_get_scancode (GdkEvent *event)
   private = (GdkEventPrivate *) event;
   return private->key_scancode;
 }
+
+void
+gdk_event_set_user_data (GdkEvent *event,
+                         GObject  *user_data)
+{
+  GdkEventPrivate *private;
+
+  if (!gdk_event_is_allocated (event))
+    return;
+
+  private = (GdkEventPrivate *) event;
+  g_set_object (&private->user_data, user_data);
+}
+
+GObject *
+gdk_event_get_user_data (GdkEvent *event)
+{
+  GdkEventPrivate *private;
+
+  if (!gdk_event_is_allocated (event))
+    return NULL;
+
+  private = (GdkEventPrivate *) event;
+  return private->user_data;
+}
diff --git a/gdk/gdkevents.h b/gdk/gdkevents.h
index 8ff9613..39cb761 100644
--- a/gdk/gdkevents.h
+++ b/gdk/gdkevents.h
@@ -1567,6 +1567,12 @@ int            gdk_event_get_scancode    (GdkEvent *event);
 GDK_AVAILABLE_IN_3_22
 gboolean       gdk_event_get_pointer_emulated (GdkEvent *event);
 
+GDK_AVAILABLE_IN_3_90
+void           gdk_event_set_user_data (GdkEvent *event,
+                                        GObject  *user_data);
+GDK_AVAILABLE_IN_3_90
+GObject *      gdk_event_get_user_data (GdkEvent *event);
+
 G_END_DECLS
 
 #endif /* __GDK_EVENTS_H__ */
diff --git a/gdk/gdkinternals.h b/gdk/gdkinternals.h
index 6e0a37b..56c26d2 100644
--- a/gdk/gdkinternals.h
+++ b/gdk/gdkinternals.h
@@ -150,6 +150,8 @@ struct _GdkEventPrivate
   GdkSeat   *seat;
   GdkDeviceTool *tool;
   guint16    key_scancode;
+
+  GObject *user_data;
 };
 
 typedef struct _GdkWindowPaint GdkWindowPaint;