[gnome-control-center] keyboard: Add 'reverse' helpers to CcKeyboardItem

[Christophe Fergeau <teuf src gnome org>]

commit f059f424879000318bb323b4f550a01fc1052b86
Author: Christophe Fergeau <cfergeau redhat com>
Date:   Thu May 1 19:40:26 2014 +0200

    keyboard: Add 'reverse' helpers to CcKeyboardItem
    
    In order to handle shortcuts which can be reversed (for example,
    super-space and shift-super-space to switch input methods
    forward/backward), we are going to add new attributes to the xml files
    describing the keyboard shortcuts to show in the panel.
    
    This commit is a first step towards that and adds the notion of
    'reverse' items to CcKeyboardItem.
    
    We will then indicate in the xml description files that
    'switch-input-source' is reversed by 'switch-input-source-backward' and
    that 'switch-input-source-backward' reverses 'switch-input-source'.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=731618

 panels/keyboard/cc-keyboard-item.c |   28 +++++++++++++++++++++++++++-
 panels/keyboard/cc-keyboard-item.h |    6 ++++++
 2 files changed, 33 insertions(+), 1 deletions(-)
---
diff --git a/panels/keyboard/cc-keyboard-item.c b/panels/keyboard/cc-keyboard-item.c
index 778eabc..4e3817e 100644
--- a/panels/keyboard/cc-keyboard-item.c
+++ b/panels/keyboard/cc-keyboard-item.c
@@ -1,6 +1,6 @@
 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
  *
- * Copyright (C) 2011 Red Hat, Inc.
+ * Copyright (C) 2011, 2014 Red Hat, Inc.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -38,6 +38,8 @@ struct CcKeyboardItemPrivate
   int foo;
 
   /* internal */
+  CcKeyboardItem *reverse_item;
+  gboolean is_reversed;
 };
 
 enum {
@@ -469,6 +471,30 @@ cc_keyboard_item_equal (CcKeyboardItem *a,
 
 }
 
+void
+cc_keyboard_item_add_reverse_item (CcKeyboardItem *item,
+                                  CcKeyboardItem *reverse_item,
+                                  gboolean is_reversed)
+{
+  g_return_if_fail (item->key != NULL);
+
+  item->priv->reverse_item = reverse_item;
+  if (reverse_item->priv->reverse_item == NULL)
+    {
+      reverse_item->priv->reverse_item = item;
+      reverse_item->priv->is_reversed = !is_reversed;
+    }
+  else
+    g_warn_if_fail (reverse_item->priv->is_reversed == !!is_reversed);
+
+  item->priv->is_reversed = !!is_reversed;
+}
+
+CcKeyboardItem *
+cc_keyboard_item_get_reverse_item (CcKeyboardItem *item)
+{
+  return item->priv->reverse_item;
+}
 /*
  * vim: sw=2 ts=8 cindent noai bs=2
  */
diff --git a/panels/keyboard/cc-keyboard-item.h b/panels/keyboard/cc-keyboard-item.h
index 08f4e81..1e8eb56 100644
--- a/panels/keyboard/cc-keyboard-item.h
+++ b/panels/keyboard/cc-keyboard-item.h
@@ -102,6 +102,12 @@ const char * cc_keyboard_item_get_command     (CcKeyboardItem *item);
 gboolean     cc_keyboard_item_equal           (CcKeyboardItem *a,
                                               CcKeyboardItem *b);
 
+void         cc_keyboard_item_add_reverse_item (CcKeyboardItem *item,
+                                               CcKeyboardItem *reverse_item,
+                                               gboolean is_reversed);
+
+CcKeyboardItem * cc_keyboard_item_get_reverse_item (CcKeyboardItem *item);
+
 G_END_DECLS
 
 #endif /* __CC_KEYBOARD_ITEM_H */