[gnome-control-center/gbsneto/panel-widget-in-sidebar: 5/14] panel: Add get_sidebar_widget() vfunc

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 75167f45fd2b7db7071d5c6223d7ff171e9d1e99
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Mon Nov 12 00:36:53 2018 -0200

    panel: Add get_sidebar_widget() vfunc
    
    This vfunc is the entry point for panels that have
    a sidebar widget. It must never return NULL.
    
    At this point, nothing uses it and this vfunc does
    not impact execution of the program.

 shell/cc-panel.c | 18 ++++++++++++++++++
 shell/cc-panel.h |  3 +++
 2 files changed, 21 insertions(+)
---
diff --git a/shell/cc-panel.c b/shell/cc-panel.c
index f4d7c4316..e01a6af78 100644
--- a/shell/cc-panel.c
+++ b/shell/cc-panel.c
@@ -214,3 +214,21 @@ cc_panel_get_title_widget (CcPanel *panel)
 
   return NULL;
 }
+
+GtkWidget*
+cc_panel_get_sidebar_widget (CcPanel *panel)
+{
+  CcPanelClass *class = CC_PANEL_GET_CLASS (panel);
+
+  if (class->get_sidebar_widget)
+    {
+      GtkWidget *sidebar_widget;
+
+      sidebar_widget = class->get_sidebar_widget (panel);
+      g_assert (sidebar_widget != NULL);
+
+      return sidebar_widget;
+    }
+
+  return NULL;
+}
diff --git a/shell/cc-panel.h b/shell/cc-panel.h
index ae73d5fa4..2103451ca 100644
--- a/shell/cc-panel.h
+++ b/shell/cc-panel.h
@@ -82,6 +82,7 @@ struct _CcPanelClass
   const char  * (* get_help_uri)   (CcPanel *panel);
 
   GtkWidget *   (* get_title_widget) (CcPanel *panel);
+  GtkWidget *   (* get_sidebar_widget) (CcPanel *panel);
 };
 
 CcShell*     cc_panel_get_shell        (CcPanel     *panel);
@@ -92,5 +93,7 @@ const char  *cc_panel_get_help_uri     (CcPanel     *panel);
 
 GtkWidget   *cc_panel_get_title_widget (CcPanel     *panel);
 
+GtkWidget*   cc_panel_get_sidebar_widget (CcPanel     *panel);
+
 G_END_DECLS