event-widget: React to time changes

When an event is timed, and we move past its end
date and time, the event does not react to that
and continues with the opacity of a regular event.

Fix that by reacting to minute changes.

src/gcal-event-widget.c

@@ -22,6 +22,8 @@
 #include <glib/gi18n.h>
 #include <string.h>
 
+#include "gcal-application.h"
+#include "gcal-clock.h"
 #include "gcal-event-widget.h"
 #include "gcal-utils.h"
 
@@ -950,6 +952,7 @@ gcal_event_widget_class_init (GcalEventWidgetClass *klass)
 static void
 gcal_event_widget_init (GcalEventWidget *self)
 {
+  GcalApplication *application;
   GtkWidget *widget;
 
   widget = GTK_WIDGET (self);
@@ -966,6 +969,17 @@ gcal_event_widget_init (GcalEventWidget *self)
   /* Starts with horizontal */
   self->orientation = GTK_ORIENTATION_HORIZONTAL;
   gtk_style_context_add_class (gtk_widget_get_style_context (widget), "horizontal");
+
+  /* Connect to the wall clock */
+  application = GCAL_APPLICATION (g_application_get_default ());
+
+  g_assert (application != NULL);
+
+  g_signal_connect_object (gcal_application_get_clock (application),
+                           "minute-changed",
+                           G_CALLBACK (update_color),
+                           self,
+                           G_CONNECT_SWAPPED);
 }
 
 GtkWidget*