introduce GRemoteActionGroup

This interfaceifies the extra functions that were on GDBusActionGroup
for dealing with platform data.

The two main benefits of doing this:

  - no longer have to do a silly song and dance in GApplication to avoid
    calling GDBusActionGroup API from non-dbus-aware code

  - the interface can be reused by the action group exporter to avoid
    ugly and unbindable hook callbacks

https://bugzilla.gnome.org/show_bug.cgi?id=665737

gio/gremoteactiongroup.c

@@ -0,0 +1,136 @@
+/*
+ * 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 "config.h"
+
+#include "gsimpleaction.h"
+#include "gactiongroup.h"
+#include "gactionmap.h"
+#include "gaction.h"
+
+/**
+ * SECTION:gremoteactiongroup
+ * @title: GRemoteActionGroup
+ * @short_description: a #GActionGroup that interacts with other processes
+ *
+ * The GRemoteActionGroup interface is implemented by #GActionGroup
+ * instances that either transmit action invocations to other processes
+ * or receive action invocations in the local process from other
+ * processes.
+ *
+ * The interface has <literal>_full</literal> variants of the two
+ * methods on #GActionGroup used to activate actions:
+ * g_action_group_activate_action() and
+ * g_action_group_change_action_state().  These variants allow a
+ * "platform data" #GVariant to be specified: a dictionary providing
+ * context for the action invocation (for example: timestamps, startup
+ * notification IDs, etc).
+ *
+ * #GDBusActionGroup implements #GRemoteActionGroup.  This provides a
+ * mechanism to send platform data for action invocations over D-Bus.
+ *
+ * Additionally, g_dbus_connection_export_action_group() will check if
+ * the exported #GActionGroup implements #GRemoteActionGroup and use the
+ * <literal>_full</literal> variants of the calls if available.  This
+ * provides a mechanism by which to receive platform data for action
+ * invocations that arrive by way of D-Bus.
+ *
+ * Since: 2.32
+ **/
+
+/**
+ * GRemoteActionGroupInterface:
+ * @activate_action_full: the virtual function pointer for g_remote_action_group_activate_action_full()
+ * @change_action_state_full: the virtual function pointer for g_remote_action_group_change_action_state_full()
+ *
+ * The virtual function table for #GRemoteActionGroup.
+ *
+ * Since: 2.32
+ **/
+
+#include "config.h"
+
+#include "gremoteactiongroup.h"
+
+G_DEFINE_INTERFACE (GRemoteActionGroup, g_remote_action_group, G_TYPE_ACTION_GROUP)
+
+static void
+g_remote_action_group_default_init (GRemoteActionGroupInterface *iface)
+{
+}
+
+/**
+ * g_remote_action_group_activate_action_full:
+ * @action_group: a #GDBusActionGroup
+ * @action_name: the name of the action to activate
+ * @parameter: (allow none): the optional parameter to the activation
+ * @platform_data: the platform data to send
+ *
+ * Activates the remote action.
+ *
+ * This is the same as g_action_group_activate_action() except that it
+ * allows for provision of "platform data" to be sent along with the
+ * activation request.  This typically contains details such as the user
+ * interaction timestamp or startup notification information.
+ *
+ * @platform_data must be non-%NULL and must have the type
+ * %G_VARIANT_TYPE_VARDICT.  If it is floating, it will be consumed.
+ *
+ * Since: 2.32
+ **/
+void
+g_remote_action_group_activate_action_full (GRemoteActionGroup *remote,
+                                            const gchar        *action_name,
+                                            GVariant           *parameter,
+                                            GVariant           *platform_data)
+{
+  G_REMOTE_ACTION_GROUP_GET_IFACE (remote)
+    ->activate_action_full (remote, action_name, parameter, platform_data);
+}
+
+/**
+ * g_remote_action_group_activate_action_full:
+ * @remote: a #GRemoteActionGroup
+ * @action_name: the name of the action to change the state of
+ * @value: the new requested value for the state
+ * @platform_data: the platform data to send
+ *
+ * Changes the state of a remote action.
+ *
+ * This is the same as g_action_group_change_action_state() except that
+ * it allows for provision of "platform data" to be sent along with the
+ * state change request.  This typically contains details such as the
+ * user interaction timestamp or startup notification information.
+ *
+ * @platform_data must be non-%NULL and must have the type
+ * %G_VARIANT_TYPE_VARDICT.  If it is floating, it will be consumed.
+ *
+ * Since: 2.32
+ **/
+void
+g_remote_action_group_change_action_state_full (GRemoteActionGroup *remote,
+                                                const gchar        *action_name,
+                                                GVariant           *value,
+                                                GVariant           *platform_data)
+{
+  G_REMOTE_ACTION_GROUP_GET_IFACE (remote)
+    ->change_action_state_full (remote, action_name, value, platform_data);
+}