[gnome-control-center/wip/gbsneto/new-keyboard-panel: 5/9] keyboard: add API to track whether a shortcut is default

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

commit 3b8785b70e779acc2592e36af12461ddbf06ae84
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Mon Jul 18 20:58:49 2016 -0300

    keyboard: add API to track whether a shortcut is default
    
    The current keyboard item API does not track whether the
    keyboard shortcut is the default value or not. In order to
    properly implement the Reset operation, the keyboard item
    must receive this API and ideally handle it internally.
    
    This patch adds the necessary API to CcKeyboardItem to track
    whether the shortcut is the default value or not.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=769063

 panels/keyboard/cc-keyboard-item.c |   62 ++++++++++++++++++++++++++++++++++++
 panels/keyboard/cc-keyboard-item.h |    4 ++
 2 files changed, 66 insertions(+), 0 deletions(-)
---
diff --git a/panels/keyboard/cc-keyboard-item.c b/panels/keyboard/cc-keyboard-item.c
index 887bdc6..1b8f6ce 100644
--- a/panels/keyboard/cc-keyboard-item.c
+++ b/panels/keyboard/cc-keyboard-item.c
@@ -50,6 +50,7 @@ enum {
   PROP_BINDING,
   PROP_EDITABLE,
   PROP_TYPE,
+  PROP_IS_VALUE_DEFAULT,
   PROP_COMMAND
 };
 
@@ -155,6 +156,8 @@ _set_binding (CcKeyboardItem *item,
     return;
 
   settings_set_binding (item->settings, item->key, item->priv->binding);
+
+  g_object_notify (G_OBJECT (item), "is-value-default");
 }
 
 static void
@@ -232,6 +235,9 @@ cc_keyboard_item_get_property (GObject    *object,
   case PROP_COMMAND:
     g_value_set_string (value, self->command);
     break;
+  case PROP_IS_VALUE_DEFAULT:
+    g_value_set_boolean (value, cc_keyboard_item_is_value_default (self));
+    break;
   default:
     G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
     break;
@@ -304,6 +310,14 @@ cc_keyboard_item_class_init (CcKeyboardItemClass *klass)
                                                         NULL,
                                                         G_PARAM_READWRITE));
 
+  g_object_class_install_property (object_class,
+                                   PROP_IS_VALUE_DEFAULT,
+                                   g_param_spec_boolean ("is-value-default",
+                                                         "is value default",
+                                                         "is value default",
+                                                         TRUE,
+                                                         G_PARAM_READABLE));
+
   g_type_class_add_private (klass, sizeof (CcKeyboardItemPrivate));
 }
 
@@ -508,6 +522,54 @@ cc_keyboard_item_is_hidden (CcKeyboardItem *item)
 {
   return item->priv->hidden;
 }
+
+/**
+ * cc_keyboard_item_is_value_default:
+ * @self: a #CcKeyboardItem
+ *
+ * Retrieves whether the shortcut is the default value or not.
+ *
+ * Returns: %TRUE if the shortcut is the default value, %FALSE otherwise.
+ */
+gboolean
+cc_keyboard_item_is_value_default (CcKeyboardItem *self)
+{
+  GVariant *user_value;
+  gboolean is_value_default;
+
+  g_return_val_if_fail (CC_IS_KEYBOARD_ITEM (self), FALSE);
+
+  /*
+   * When the shortcut is custom, we don't treat it as modified
+   * since we don't know what would be its default value.
+   */
+  if (self->type == CC_KEYBOARD_ITEM_TYPE_GSETTINGS_PATH)
+    return TRUE;
+
+  user_value = g_settings_get_user_value (self->settings, self->key);
+  is_value_default = user_value == NULL;
+
+  g_clear_pointer (&user_value, g_variant_unref);
+
+  return is_value_default;
+}
+
+/**
+ * cc_keyboard_item_reset:
+ * @self: a #CcKeyboardItem
+ *
+ * Reset the keyboard binding to the default value.
+ */
+void
+cc_keyboard_item_reset (CcKeyboardItem *self)
+{
+  g_return_if_fail (CC_IS_KEYBOARD_ITEM (self));
+
+  g_settings_reset (self->settings, self->key);
+
+  g_object_notify (G_OBJECT (self), "is-value-default");
+}
+
 /*
  * 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 afe99b6..32ee3df 100644
--- a/panels/keyboard/cc-keyboard-item.h
+++ b/panels/keyboard/cc-keyboard-item.h
@@ -109,6 +109,10 @@ void             cc_keyboard_item_set_hidden       (CcKeyboardItem *item,
                                                    gboolean hidden);
 gboolean         cc_keyboard_item_is_hidden        (CcKeyboardItem *item);
 
+gboolean         cc_keyboard_item_is_value_default (CcKeyboardItem *self);
+
+void             cc_keyboard_item_reset            (CcKeyboardItem *self);
+
 G_END_DECLS
 
 #endif /* __CC_KEYBOARD_ITEM_H */