add GAction base class

docs/reference/gio/gio-docs.xml

@@ -163,6 +163,7 @@
     <chapter id="application">
         <title>Application support</title>
         <xi:include href="xml/gactiongroup.xml"/>
+        <xi:include href="xml/gaction.xml"/>
         <xi:include href="xml/gapplication.xml"/>
     </chapter>
     <chapter id="extending">

docs/reference/gio/gio-sections.txt

@@ -2700,3 +2700,34 @@ G_ACTION_GROUP_CLASS
 G_ACTION_GROUP_GET_CLASS
 G_ACTION_GROUP
 </SECTION>
+
+
+<SECTION>
+<FILE>gaction</FILE>
+<TITLE>GAction</TITLE>
+GAction
+GActionClass
+
+<SUBSECTION>
+g_action_get_name
+g_action_get_parameter_type
+g_action_get_state_type
+g_action_get_state_hint
+
+<SUBSECTION>
+g_action_get_enabled
+g_action_set_enabled
+g_action_get_state
+g_action_set_state
+
+<SUBSECTION>
+g_action_activate
+
+<SUBSECTION Standard>
+g_action_get_type
+G_TYPE_ACTION
+G_IS_ACTION
+G_ACTION_CLASS
+G_ACTION_GET_CLASS
+G_ACTION
+</SECTION>

docs/reference/gio/gio.types

@@ -1,3 +1,4 @@
+g_action_get_type
 g_action_group_get_type
 g_app_info_create_flags_get_type
 g_app_info_get_type

gio/Makefile.am

@@ -130,10 +130,12 @@ settings_sources = \
 
 application_headers = \
 	gactiongroup.h			\
+	gaction.h			\
 	gapplication.h
 
 application_sources = \
 	gactiongroup.c			\
+	gaction.c			\
 	gapplication.c
 
 

gio/gaction.c

@@ -0,0 +1,597 @@
+/*
+ * Copyright © 2010 Codethink Limited
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; either version 2 of the licence or (at
+ * your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Authors: Ryan Lortie <desrt@desrt.ca>
+ */
+
+#include "gaction.h"
+
+G_DEFINE_TYPE (GAction, g_action, G_TYPE_OBJECT)
+
+/**
+ * SECTION:gaction
+ * @title: GAction
+ * @short_description: an action
+ *
+ * #GAction represents a single named action.
+ *
+ * The main interface to an action is that it can be activated with
+ * g_action_activate().  This results in the 'activate' signal being
+ * emitted.  An activation has a #GVariant parameter (which may be
+ * %NULL).  The correct type for the parameter is determined by a static
+ * parameter type (which is given at construction time).
+ *
+ * An action may optionally have a state, in which case the state may be
+ * set with g_action_set_state().  This call takes a #GVariant.  The
+ * correct type for the state is determined by a static state type
+ * (which is given at construction time).
+ *
+ * The state may have a hint associated with it, specifying its valid
+ * range.
+ *
+ * #GAction is intended to be used both as a simple action class and as
+ * a base class for more complicated action types.  The base class
+ * itself supports activation and state.  Not supported are state hints
+ * and filtering requests to set the state based on the requested value.
+ * You should subclass if you require either of these abilities.
+ *
+ * In all cases, the base class is responsible for storing the name of
+ * the action, the parameter type, the enabled state, the optional state
+ * type and the state and emitting the appropriate signals when these
+ * change.  The base class is also responsbile for filtering calls to
+ * g_action_activate() and g_action_set_state() for type safety and for
+ * the state being enabled.
+ *
+ * Probably the only useful thing to do with a #GAction is to put it
+ * inside of a #GSimpleActionGroup.
+ **/
+
+struct _GActionPrivate
+{
+  gchar        *name;
+  GVariantType *parameter_type;
+  gboolean      enabled;
+
+  GVariantType *state_type;
+  GVariant     *state;
+};
+
+enum
+{
+  PROP_NONE,
+  PROP_NAME,
+  PROP_PARAMETER_TYPE,
+  PROP_ENABLED,
+  PROP_STATE_TYPE,
+  PROP_STATE
+};
+
+enum
+{
+  SIGNAL_ACTIVATE,
+  NR_SIGNALS
+};
+
+static guint g_action_signals[NR_SIGNALS];
+
+static void
+g_action_real_set_state (GAction  *action,
+                         GVariant *value)
+{
+  if (action->priv->state == value)
+    return;
+
+  if (!action->priv->state || !g_variant_equal (action->priv->state, value))
+    {
+      if (action->priv->state)
+        g_variant_unref (action->priv->state);
+
+      action->priv->state = g_variant_ref (value);
+
+      g_object_notify (G_OBJECT (action), "state");
+    }
+}
+
+static GVariant *
+g_action_real_get_state_hint (GAction *action)
+{
+  return NULL;
+}
+
+static void
+g_action_set_property (GObject *object, guint prop_id,
+                       const GValue *value, GParamSpec *pspec)
+{
+  GAction *action = G_ACTION (object);
+
+  switch (prop_id)
+    {
+    case PROP_NAME:
+      g_assert (action->priv->name == NULL);
+      action->priv->name = g_value_dup_string (value);
+      break;
+
+    case PROP_PARAMETER_TYPE:
+      g_assert (action->priv->parameter_type == NULL);
+      action->priv->parameter_type = g_value_dup_boxed (value);
+      break;
+
+    case PROP_ENABLED:
+      g_action_set_enabled (action, g_value_get_boolean (value));
+      break;
+
+    case PROP_STATE_TYPE:
+      g_assert (action->priv->state_type == NULL);
+      action->priv->state_type = g_value_dup_boxed (value);
+      break;
+
+    case PROP_STATE:
+      g_action_set_state (action, g_value_get_variant (value));
+      break;
+
+    default:
+      g_assert_not_reached ();
+    }
+}
+
+static void
+g_action_get_property (GObject *object, guint prop_id,
+                       GValue *value, GParamSpec *pspec)
+{
+  GAction *action = G_ACTION (object);
+
+  switch (prop_id)
+    {
+    case PROP_NAME:
+      g_value_set_string (value, g_action_get_name (action));
+      break;
+
+    case PROP_PARAMETER_TYPE:
+      g_value_set_boxed (value, g_action_get_parameter_type (action));
+      break;
+
+    case PROP_ENABLED:
+      g_value_set_boolean (value, g_action_get_enabled (action));
+      break;
+
+    case PROP_STATE_TYPE:
+      g_value_set_boxed (value, g_action_get_state_type (action));
+      break;
+
+    case PROP_STATE:
+      g_value_set_variant (value, g_action_get_state (action));
+      break;
+
+    default:
+      g_assert_not_reached ();
+    }
+}
+
+static void
+g_action_finalize (GObject *object)
+{
+  GAction *action = G_ACTION (object);
+
+  g_free (action->priv->name);
+  if (action->priv->parameter_type)
+    g_variant_type_free (action->priv->parameter_type);
+  if (action->priv->state_type)
+    g_variant_type_free (action->priv->state_type);
+  if (action->priv->state)
+    g_variant_unref (action->priv->state);
+
+  G_OBJECT_CLASS (g_action_parent_class)
+    ->finalize (object);
+}
+
+void
+g_action_init (GAction *action)
+{
+  action->priv = G_TYPE_INSTANCE_GET_PRIVATE (action,
+                                              G_TYPE_ACTION,
+                                              GActionPrivate);
+}
+
+void
+g_action_class_init (GActionClass *class)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (class);
+
+  class->get_state_hint = g_action_real_get_state_hint;
+  class->set_state = g_action_real_set_state;
+
+  object_class->get_property = g_action_get_property;
+  object_class->set_property = g_action_set_property;
+  object_class->finalize = g_action_finalize;
+
+  /**
+   * GAction::activate:
+   * @action: the #GAction
+   * @parameter: (allow-none): the parameter to the activation
+   *
+   * Indicates that the action was just activated.
+   *
+   * @parameter will always be of the expected type.  In the event that
+   * an incorrect type was given, no signal will be emitted.
+   **/
+  g_action_signals[SIGNAL_ACTIVATE] =
+    g_signal_new ("activate", G_TYPE_ACTION, G_SIGNAL_RUN_LAST,
+                  G_STRUCT_OFFSET (GActionClass, activate),
+                  NULL, NULL, g_cclosure_marshal_VOID__VARIANT,
+                  G_TYPE_NONE, 1, G_TYPE_VARIANT);
+
+  /**
+   * GAction:name:
+   *
+   * The name of the action.  This is mostly meaningful for identifying
+   * the action once it has been added to a #GActionGroup.
+   **/
+  g_object_class_install_property (object_class, PROP_NAME,
+    g_param_spec_string ("name", "action name",
+                         "the name used to invoke the action",
+                         NULL, G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
+                         G_PARAM_STATIC_STRINGS));
+
+  /**
+   * GAction:parameter-type:
+   *
+   * The type of the parameter that must be given when activating the
+   * action.
+   **/
+  g_object_class_install_property (object_class, PROP_PARAMETER_TYPE,
+    g_param_spec_boxed ("parameter-type", "parameter type",
+                        "the type of GVariant passed to activate()",
+                        G_TYPE_VARIANT_TYPE, G_PARAM_READWRITE |
+                        G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
+
+  /**
+   * GAction:enabled:
+   *
+   * If @action is currently enabled.
+   *
+   * If the action is disabled then calls to g_action_activate() and
+   * g_action_set_state() have no effect.
+   **/
+  g_object_class_install_property (object_class, PROP_ENABLED,
+    g_param_spec_boolean ("enabled", "enabled",
+                          "if the action can be activated", TRUE,
+                          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  /**
+   * GAction:state-type:
+   *
+   * The #GVariantType of the state that the action has, or %NULL if the
+   * action is stateless.
+   **/
+  g_object_class_install_property (object_class, PROP_STATE_TYPE,
+    g_param_spec_boxed ("state-type", "state type",
+                        "the type of the state kept by the action",
+                        G_TYPE_VARIANT_TYPE, G_PARAM_READWRITE |
+                        G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
+
+  /**
+   * GAction:state:
+   *
+   * The state of the action, or %NULL if the action is stateless.
+   **/
+  g_object_class_install_property (object_class, PROP_STATE,
+    g_param_spec_variant ("state", "state", "the state the action is in",
+                          G_VARIANT_TYPE_ANY, NULL,
+                          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  g_type_class_add_private (class, sizeof (GActionPrivate));
+}
+
+/**
+ * g_action_set_state:
+ * @action: a #GAction
+ * @value: the new state
+ *
+ * Request for the state of @action to be changed to @value.
+ *
+ * The action must be stateful and @value must be of the correct type.
+ * See g_action_get_state_type().
+ *
+ * This call merely requests a change.  The action may refuse to change
+ * its state or may change its state to something other than @value.
+ * See g_action_get_state_hint().
+ *
+ * Since: 2.26
+ **/
+void
+g_action_set_state (GAction  *action,
+                    GVariant *value)
+{
+  g_return_if_fail (G_IS_ACTION (action));
+  g_return_if_fail ((action->priv->state_type == NULL && value == NULL) ||
+                    g_variant_is_of_type (value, action->priv->state_type));
+
+  g_variant_ref_sink (value);
+
+  if (action->priv->enabled)
+    G_ACTION_GET_CLASS (action)
+      ->set_state (action, value);
+
+  g_variant_unref (value);
+}
+
+/**
+ * g_action_get_state:
+ * @action: a #GAction
+ *
+ * Queries the current state of @action.
+ *
+ * If the action is not stateful then %NULL will be returned.  If the
+ * action is stateful then the type of the return value is the type
+ * given by g_action_get_state_type().
+ *
+ * The return value (if non-%NULL) should be freed with
+ * g_variant_unref() when it is no longer required.
+ *
+ * Returns: (allow-none): the current state of the action
+ *
+ * Since: 2.26
+ **/
+GVariant *
+g_action_get_state (GAction *action)
+{
+  g_return_val_if_fail (G_IS_ACTION (action), NULL);
+
+  return action->priv->state;
+}
+
+/**
+ * g_action_get_name:
+ * @action: a #GAction
+ *
+ * Queries the name of @action.
+ *
+ * Returns: the name of the action
+ *
+ * Since: 2.26
+ **/
+const gchar *
+g_action_get_name (GAction *action)
+{
+  g_return_val_if_fail (G_IS_ACTION (action), NULL);
+
+  return action->priv->name;
+}
+
+/**
+ * g_action_get_parameter_type:
+ * @action: a #GAction
+ *
+ * Queries the type of the parameter that must be given when activating
+ * @action.
+ *
+ * When activating the action using g_action_activate(), the #GVariant
+ * given to that function must be of the type returned by this function.
+ *
+ * In the case that this function returns %NULL, you must not give any
+ * #GVariant, but %NULL instead.
+ *
+ * Returns: (allow-none): the parameter type
+ *
+ * Since: 2.26
+ **/
+const GVariantType *
+g_action_get_parameter_type (GAction *action)
+{
+  g_return_val_if_fail (G_IS_ACTION (action), NULL);
+
+  return action->priv->parameter_type;
+}
+
+/**
+ * g_action_get_state_type:
+ * @action: a #GAction
+ *
+ * Queries the type of the state of @action.
+ *
+ * If the action is stateful (ie: was created with
+ * g_action_new_stateful()) then this function returns the #GVariantType
+ * of the state.  This is the type of the initial value given as the
+ * state.  All calls to g_action_set_state() must give a #GVariant of
+ * this type and g_action_get_state() will return a #GVariant of the
+ * same type.
+ *
+ * If the action is not stateful (ie: created with g_action_new()) then
+ * this function will return %NULL.  In that case, g_action_get_state()
+ * will return %NULL and you must not call g_action_set_state().
+ *
+ * Returns: (allow-none): the state type, if the action is stateful
+ *
+ * Since: 2.26
+ **/
+const GVariantType *
+g_action_get_state_type (GAction *action)
+{
+  g_return_val_if_fail (G_IS_ACTION (action), NULL);
+
+  return action->priv->state_type;
+}
+
+/**
+ * g_action_get_state_hint:
+ * @action: a #GAction
+ *
+ * Requests a hint about the valid range of values for the state of
+ * @action.
+ *
+ * If %NULL is returned it either means that the action is not stateful
+ * or that there is no hint about the valid range of values for the
+ * state of the action.
+ *
+ * If a #GVariant array is returned then each item in the array is a
+ * possible value for the state.  If a #GVariant pair (ie: two-tuple) is
+ * returned then the tuple specifies the inclusive lower and upper bound
+ * of valid values for the state.
+ *
+ * In any case, the information is merely a hint.  It may be possible to
+ * have a state value outside of the hinted range and setting a value
+ * within the range may fail.
+ *
+ * The return value (if non-%NULL) should be freed with
+ * g_variant_unref() when it is no longer required.
+ *
+ * Returns: (allow-none): the state range hint
+ *
+ * Since: 2.26
+ **/
+GVariant *
+g_action_get_state_hint (GAction *action)
+{
+  g_return_val_if_fail (G_IS_ACTION (action), NULL);
+
+  return G_ACTION_GET_CLASS (action)
+    ->get_state_hint (action);
+}
+
+/**
+ * g_action_get_enabled:
+ * @action: a #GAction
+ *
+ * Checks if @action is currently enabled.
+ *
+ * An action must be enabled in order to be activated or in order to
+ * have its state changed from outside callers.
+ *
+ * Returns: whether the action is enabled
+ *
+ * Since: 2.26
+ **/
+gboolean
+g_action_get_enabled (GAction *action)
+{
+  g_return_val_if_fail (G_IS_ACTION (action), FALSE);
+
+  return action->priv->enabled;
+}
+
+/**
+ * g_action_set_enabled:
+ * @action: a #GAction
+ * @enabled: whether the action is enabled
+ *
+ * Sets the action as enabled or not.
+ *
+ * An action must be enabled in order to be activated or in order to
+ * have its state changed from outside callers.
+ *
+ * Since: 2.26
+ **/
+void
+g_action_set_enabled (GAction  *action,
+                      gboolean  enabled)
+{
+  g_return_if_fail (G_IS_ACTION (action));
+
+  enabled = !!enabled;
+
+  if (action->priv->enabled != enabled)
+    {
+      action->priv->enabled = enabled;
+      g_object_notify (G_OBJECT (action), "enabled");
+    }
+}
+
+/**
+ * g_action_activate:
+ * @action: a #GAction
+ * @parameter: the parameter to the activation
+ *
+ * Activates the action.
+ *
+ * @parameter must be the correct type of parameter for the action (ie:
+ * the parameter type given at construction time).  If the parameter
+ * type was %NULL then @parameter must also be %NULL.
+ *
+ * Since: 2.26
+ **/
+void
+g_action_activate (GAction  *action,
+                   GVariant *parameter)
+{
+  g_return_if_fail (G_IS_ACTION (action));
+
+  g_return_if_fail (action->priv->parameter_type == NULL ?
+                      parameter == NULL :
+                    (parameter != NULL &&
+                     g_variant_is_of_type (parameter,
+                                           action->priv->parameter_type)));
+
+  if (parameter)
+    g_variant_ref_sink (parameter);
+
+  if (action->priv->enabled)
+    g_signal_emit (action, g_action_signals[SIGNAL_ACTIVATE], 0, parameter);
+
+  if (parameter)
+    g_variant_unref (parameter);
+}
+
+/**
+ * g_action_new:
+ * @name: the name of the action
+ * @parameter_type: the type of parameter to the activate function
+ *
+ * Creates a new action.
+ *
+ * The created action is stateless.  See g_action_new_stateful().
+ *
+ * Returns: a new #GAction
+ *
+ * Since: 2.26
+ **/
+GAction *
+g_action_new (const gchar        *name,
+              const GVariantType *parameter_type)
+{
+  return g_object_new (G_TYPE_ACTION,
+                       "name", name,
+                       "parameter-type", parameter_type,
+                       NULL);
+}
+
+/**
+ * g_action_new_stateful:
+ * @name: the name of the action
+ * @parameter_type: the type of the parameter to the activate function
+ * @state: the initial state of the action
+ *
+ * Creates a new stateful action.
+ *
+ * @state is the initial state of the action.  All future state values
+ * must have the same #GVariantType as the initial state.
+ *
+ * Returns: a new #GAction
+ *
+ * Since: 2.26
+ **/
+GAction *
+g_action_new_stateful (const gchar        *name,
+                       const GVariantType *parameter_type,
+                       GVariant           *state)
+{
+  return g_object_new (G_TYPE_ACTION,
+                       "name", name,
+                       "parameter-type", parameter_type,
+                       "state", state,
+                       NULL);
+}

gio/gaction.h

@@ -0,0 +1,120 @@
+/*
+ * Copyright © 2010 Codethink Limited
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; either version 2 of the licence or (at
+ * your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General
+ * Public License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Authors: Ryan Lortie <desrt@desrt.ca>
+ */
+
+#if !defined (__GIO_GIO_H_INSIDE__) && !defined (GIO_COMPILATION)
+#error "Only <gio/gio.h> can be included directly."
+#endif
+
+#ifndef __G_ACTION_H__
+#define __G_ACTION_H__
+
+#include <gio/giotypes.h>
+
+G_BEGIN_DECLS
+
+#define G_TYPE_ACTION                                       (g_action_get_type ())
+#define G_ACTION(inst)                                      (G_TYPE_CHECK_INSTANCE_CAST ((inst),                     \
+                                                             G_TYPE_ACTION, GAction))
+#define G_ACTION_CLASS(class)                               (G_TYPE_CHECK_CLASS_CAST ((class),                       \
+                                                             G_TYPE_ACTION, GActionClass))
+#define G_IS_ACTION(inst)                                   (G_TYPE_CHECK_INSTANCE_TYPE ((inst), G_TYPE_ACTION))
+#define G_IS_ACTION_CLASS(class)                            (G_TYPE_CHECK_CLASS_TYPE ((class), G_TYPE_ACTION))
+#define G_ACTION_GET_CLASS(inst)                            (G_TYPE_INSTANCE_GET_CLASS ((inst),                      \
+                                                             G_TYPE_ACTION, GActionClass))
+
+typedef struct _GActionPrivate                              GActionPrivate;
+typedef struct _GActionClass                                GActionClass;
+
+/**
+ * GAction:
+ *
+ * The <structname>GAction</structname> structure contains private
+ * data and should only be accessed using the provided API
+ *
+ * Since: 2.26
+ */
+struct _GAction
+{
+  /*< private >*/
+  GObject parent_instance;
+
+  GActionPrivate *priv;
+};
+
+/**
+ * GActionClass:
+ * @get_state_hint: the virtual function pointer for g_action_get_state_hint()
+ * @set_state: the virtual function pointer for g_action_set_state().  The implementation should check the value
+ *             for validity and then chain up to the handler in the base class in order to actually update the
+ *             state.
+ * @activate: the class closure for the activate signal
+ *
+ * Since: 2.26
+ */
+struct _GActionClass
+{
+  GObjectClass parent_class;
+
+  /*< public >*/
+  /* virtual functions */
+  GVariant *           (* get_state_hint)       (GAction  *action);
+  void                 (* set_state)            (GAction  *action,
+                                                 GVariant *state);
+
+  /*< private >*/
+  gpointer vfunc_padding[6];
+
+  /*< public >*/
+  /* signals */
+  void                 (* activate)             (GAction  *action,
+                                                 GVariant *parameter);
+
+  /*< private >*/
+  gpointer signal_padding[6];
+};
+
+GType                   g_action_get_type                               (void) G_GNUC_CONST;
+
+GAction *               g_action_new                                    (const gchar        *name,
+                                                                         const GVariantType *parameter_type);
+
+GAction *               g_action_new_stateful                           (const gchar        *name,
+                                                                         const GVariantType *parameter_type,
+                                                                         GVariant           *state);
+
+const gchar *           g_action_get_name                               (GAction            *action);
+const GVariantType *    g_action_get_parameter_type                     (GAction            *action);
+const GVariantType *    g_action_get_state_type                         (GAction            *action);
+GVariant *              g_action_get_state_hint                         (GAction            *action);
+
+gboolean                g_action_get_enabled                            (GAction            *action);
+void                    g_action_set_enabled                            (GAction            *action,
+                                                                         gboolean            enabled);
+
+GVariant *              g_action_get_state                              (GAction            *action);
+void                    g_action_set_state                              (GAction            *action,
+                                                                         GVariant           *value);
+
+void                    g_action_activate                               (GAction            *action,
+                                                                         GVariant           *parameter);
+G_END_DECLS
+
+#endif /* __G_ACTION_H__ */

gio/gio.symbols

@@ -1842,3 +1842,20 @@ g_action_group_set_state
 #endif
 #endif
 
+#if IN_HEADER(__G_ACTION_H__)
+#if IN_FILE(__G_ACTION_C__)
+g_action_activate
+g_action_get_enabled
+g_action_get_name
+g_action_get_parameter_type
+g_action_get_state
+g_action_get_state_hint
+g_action_get_state_type
+g_action_get_type
+g_action_new
+g_action_new_stateful
+g_action_set_enabled
+g_action_set_state
+#endif
+#endif
+

gio/giotypes.h

@@ -48,6 +48,7 @@ typedef struct _GZlibCompressor               GZlibCompressor;
 typedef struct _GZlibDecompressor             GZlibDecompressor;
 
 typedef struct _GActionGroup                  GActionGroup;
+typedef struct _GAction                       GAction;
 typedef struct _GSettingsBackend              GSettingsBackend;
 typedef struct _GSettings                     GSettings;
 typedef struct _GPermission                   GPermission;