views/month-view-row: Add method for focusing adjacent cells

This method allows to focus the month cells behind the event widgets.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-calendar/-/merge_requests/564>

src/gui/views/gcal-month-view-row.c

@@ -1273,3 +1273,20 @@ gcal_month_view_row_update_selection (GcalMonthViewRow *self,
       gcal_month_cell_set_selected (month_cell, selected);
     }
 }
+
+gboolean
+gcal_month_view_row_focus_adjacent_cell (GcalMonthViewRow *self,
+                                         GtkWidget        *widget)
+{
+  GtkWidget *cell;
+  g_autoptr (FocusEventData) data = NULL;
+
+  g_assert (GCAL_IS_MONTH_VIEW_ROW (self));
+  g_assert (gtk_widget_is_ancestor (widget, GTK_WIDGET (self)));
+
+  data = create_focus_event_data (self, widget);
+
+  cell = gcal_month_view_row_get_cell_at_x (self, data->focal_x);
+
+  return gtk_widget_grab_focus (cell);
+}

src/gui/views/gcal-month-view-row.h

@@ -59,4 +59,7 @@ GtkWidget*           gcal_month_view_row_get_cell_at_x           (GcalMonthViewR
 
 void                 gcal_month_view_row_update_selection       (GcalMonthViewRow    *self,
                                                                  GcalRange           *selection_range);
+
+gboolean             gcal_month_view_row_focus_adjacent_cell    (GcalMonthViewRow    *self,
+                                                                 GtkWidget           *widget);
 G_END_DECLS