Improving GcalView API.

Added GcalView::update signal for when the view will change it's date range
Added GcalView::create-event signal for when the view wants to create a new
event

Added GcalView::clear_selection method for clearing new-event mark.

Note: The views can choose to mark before send a ::create-event signal the range
over which they will create the new event. This will be called new-event mark.

src/gcal-view.h

@@ -40,6 +40,10 @@ struct _GcalViewIface
 {
   GTypeInterface parent_iface;
 
+  /* signals */
+  void            (*create_event)         (GcalView *view, icaltimetype *start_span, icaltimetype *end_span, gdouble x, gdouble y);
+  void            (*updated)              (GcalView *view, icaltimetype *date);
+
   /* pure virtual methods */
   icaltimetype*   (*get_initial_date)     (GcalView *view);
   icaltimetype*   (*get_final_date)       (GcalView *view);
@@ -47,6 +51,8 @@ struct _GcalViewIface
   gboolean        (*contains)             (GcalView *view, icaltimetype *date);
   void            (*remove_by_uuid)       (GcalView *view, const gchar *uuid);
   GtkWidget*      (*get_by_uuid)          (GcalView *view, const gchar *uuid);
+
+  void            (*clear_selection)      (GcalView *view);
 };
 
 GType         gcal_view_get_type          (void);
@@ -60,7 +66,7 @@ icaltimetype* gcal_view_get_initial_date  (GcalView     *view);
 
 icaltimetype* gcal_view_get_final_date    (GcalView     *view);
 
-gboolean      gcal_view_contains       (GcalView     *view,
+gboolean      gcal_view_contains          (GcalView     *view,
                                            icaltimetype *date);
 
 void          gcal_view_remove_by_uuid    (GcalView     *view,
@@ -69,6 +75,8 @@ void          gcal_view_remove_by_uuid    (GcalView     *view,
 GtkWidget*    gcal_view_get_by_uuid       (GcalView     *view,
                                            const gchar  *uuid);
 
+void          gcal_view_clear_selection   (GcalView     *view);
+
 G_END_DECLS
 
 #endif /* __GCAL_MONTH_VIEW_H__ */