view: add :will_add_event vfunc and stub methods

Note: this commit probably won't build, but this is the right order of
keeping history.

src/gcal-month-view.c

@@ -133,6 +133,9 @@ static GtkWidget*     gcal_month_view_get_by_uuid           (GcalView       *vie
 
 static void           gcal_month_view_clear                 (GcalView       *view);
 
+static gboolean       gcal_month_view_will_add_event        (GcalView        *view,
+                                                             GcalEventWidget *event);
+
 G_DEFINE_TYPE_WITH_CODE (GcalMonthView,
                          gcal_month_view,
                          GTK_TYPE_CONTAINER,
@@ -214,6 +217,8 @@ gcal_view_interface_init (GcalViewIface *iface)
   iface->draw_event = gcal_month_view_draw_event;
   iface->get_by_uuid = gcal_month_view_get_by_uuid;
   iface->clear = gcal_month_view_clear;
+
+  iface->will_add_event = gcal_month_view_will_add_event;
 }
 
 static void
@@ -1295,6 +1300,13 @@ gcal_month_view_clear (GcalView *view)
                          (GtkCallback) gtk_widget_destroy, NULL);
 }
 
+static gboolean
+gcal_month_view_will_add_event (GcalView        *view,
+                                GcalEventWidget *event)
+{
+  ;
+}
+
 /* Public API */
 /**
  * gcal_month_view_new:

src/gcal-view.c

@@ -289,3 +289,25 @@ gcal_view_clear (GcalView *view)
 
   GCAL_VIEW_GET_INTERFACE (view)->clear (view);
 }
+
+/**
+ * gcal_view_will_add_event:
+ * @view: a #GcalView
+ * @event: a #GcalEventWidget
+ *
+ * Check the ranges of dates and the existence of the widget in
+ * in the view already
+ *
+ * Returns: %TRUE if the date of the widget fall inside the range and
+ *          the widget isn't already on the view, %FALSE otherwise
+ **/
+gboolean
+gcal_view_will_add_event (GcalView        *view,
+                          GcalEventWidget *event)
+{
+  g_return_val_if_fail (GCAL_IS_VIEW (view), FALSE);
+  g_return_if_fail (GCAL_VIEW_GET_INTERFACE (view)->will_add_event);
+
+  return GCAL_VIEW_GET_INTERFACE (view)->will_add_event (view,
+                                                         event);
+}

src/gcal-view.h

@@ -20,10 +20,7 @@
 #ifndef __GCAL_VIEW_H__
 #define __GCAL_VIEW_H__
 
-#include <glib-object.h>
-#include <gtk/gtk.h>
-
-#include <libical/icaltime.h>
+#include "gcal-event-widget.h"
 
 G_BEGIN_DECLS
 
@@ -73,6 +70,9 @@ struct _GcalViewIface
   gboolean        (*draw_event)                         (GcalView *view, icaltimetype *start_date, icaltimetype *end_date);
   GtkWidget*      (*get_by_uuid)                        (GcalView *view, const gchar *uuid);
   void            (*clear)                              (GcalView *view);
+
+  /* Newer API */
+  gboolean        (*will_add_event)                     (GcalView *view, GcalEventWidget *event);
 };
 
 GType         gcal_view_get_type                      (void);
@@ -113,6 +113,9 @@ GtkWidget*    gcal_view_get_by_uuid                   (GcalView     *view,
 
 void          gcal_view_clear                         (GcalView     *view);
 
+gboolean      gcal_view_will_add_event                (GcalView     *view,
+						       GcalEventWidget *event);
+
 G_END_DECLS
 
 #endif /* __GCAL_MONTH_VIEW_H__ */

src/gcal-week-view.c

@@ -156,6 +156,9 @@ static gboolean       gcal_week_view_draw_event            (GcalView       *view
 static GtkWidget*     gcal_week_view_get_by_uuid           (GcalView       *view,
                                                             const gchar    *uuid);
 
+static gboolean       gcal_week_view_will_add_event        (GcalView        *view,
+                                                            GcalEventWidget *event);
+
 G_DEFINE_TYPE_WITH_CODE (GcalWeekView,
                          gcal_week_view,
                          GTK_TYPE_CONTAINER,
@@ -234,6 +237,8 @@ gcal_view_interface_init (GcalViewIface *iface)
   iface->draw_event = gcal_week_view_draw_event;
   iface->get_by_uuid = gcal_week_view_get_by_uuid;
   /* iface->clear = gcal_week_view_clear; */
+
+  iface->will_add_event = gcal_week_view_will_add_event;
 }
 
 static void
@@ -1410,6 +1415,13 @@ gcal_week_view_get_by_uuid (GcalView    *view,
   return NULL;
 }
 
+static gboolean
+gcal_week_view_will_add_event (GcalView        *view,
+                               GcalEventWidget *event)
+{
+  ;
+}
+
 /* Public API */
 /**
  * gcal_week_view_new:

src/gcal-year-view.c

@@ -131,6 +131,9 @@ static GtkWidget*     gcal_year_view_get_by_uuid                  (GcalView
 
 static void           gcal_year_view_clear                        (GcalView       *view);
 
+static gboolean       gcal_year_view_will_add_event               (GcalView        *view,
+                                                                   GcalEventWidget *event);
+
 G_DEFINE_TYPE_WITH_CODE (GcalYearView,
                          gcal_year_view,
                          GTK_TYPE_CONTAINER,
@@ -213,6 +216,8 @@ gcal_view_interface_init (GcalViewIface *iface)
   iface->draw_event = gcal_year_view_draw_event;
   iface->get_by_uuid = gcal_year_view_get_by_uuid;
   iface->clear = gcal_year_view_clear;
+
+  iface->will_add_event = gcal_year_view_will_add_event;
 }
 
 static void
@@ -1026,6 +1031,13 @@ gcal_year_view_clear (GcalView *view)
                          (GtkCallback) gtk_widget_destroy, NULL);
 }
 
+static gboolean
+gcal_year_view_will_add_event (GcalView        *view,
+                               GcalEventWidget *event)
+{
+  ;
+}
+
 /* Public API */
 /**
  * gcal_year_view_new: