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519 lines
16 KiB
C
519 lines
16 KiB
C
/*
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* Copyright © 2010 Codethink Limited
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2 of the licence or (at
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* your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* Authors: Ryan Lortie <desrt@desrt.ca>
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*/
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#include "config.h"
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#include "gactiongroup.h"
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#include "gaction.h"
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#include "gio-marshal.h"
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#include "glibintl.h"
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/**
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* SECTION:gactiongroup
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* @title: GActionGroup
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* @short_description: a group of actions
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*
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* #GActionGroup represents a group of actions.
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*
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* Each action in the group has a unique name (which is a string). All
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* method calls, except g_action_group_list_actions() take the name of
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* an action as an argument.
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*
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* The #GActionGroup API is meant to be the 'public' API to the action
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* group. The calls here are exactly the interaction that 'external
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* forces' (eg: UI, incoming D-Bus messages, etc.) are supposed to have
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* with actions. 'Internal' APIs (ie: ones meant only to be accessed by
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* the action group implementation) are found on subclasses. This is
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* why you will find -- for example -- g_action_group_get_enabled() but
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* not an equivalent <function>set()</function> call.
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*
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* Signals are emitted on the action group in response to state changes
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* on individual actions.
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**/
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G_DEFINE_INTERFACE (GActionGroup, g_action_group, G_TYPE_OBJECT)
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enum
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{
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SIGNAL_ACTION_ADDED,
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SIGNAL_ACTION_REMOVED,
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SIGNAL_ACTION_ENABLED_CHANGED,
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SIGNAL_ACTION_STATE_CHANGED,
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NR_SIGNALS
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};
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static guint g_action_group_signals[NR_SIGNALS];
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static void
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g_action_group_default_init (GActionGroupInterface *class)
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{
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/**
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* GActionGroup::action-added:
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* @action_group: the #GActionGroup that changed
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* @action_name: the name of the action in @action_group
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*
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* Signals that a new action was just added to the group. This signal
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* is emitted after the action has been added and is now visible.
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*
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* Since: 2.28
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**/
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g_action_group_signals[SIGNAL_ACTION_ADDED] =
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g_signal_new (I_("action-added"),
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G_TYPE_ACTION_GROUP,
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G_SIGNAL_RUN_LAST | G_SIGNAL_DETAILED,
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G_STRUCT_OFFSET (GActionGroupInterface, action_added),
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NULL, NULL,
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g_cclosure_marshal_VOID__STRING,
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G_TYPE_NONE, 1,
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G_TYPE_STRING);
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/**
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* GActionGroup::action-removed:
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* @action_group: the #GActionGroup that changed
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* @action_name: the name of the action in @action_group
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*
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* Signals that an action is just about to be removed from the group.
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* This signal is emitted before the action is removed, so the action
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* is still visible and can be queried from the signal handler.
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*
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* Since: 2.28
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**/
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g_action_group_signals[SIGNAL_ACTION_REMOVED] =
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g_signal_new (I_("action-removed"),
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G_TYPE_ACTION_GROUP,
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G_SIGNAL_RUN_LAST | G_SIGNAL_DETAILED,
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G_STRUCT_OFFSET (GActionGroupInterface, action_removed),
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NULL, NULL,
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g_cclosure_marshal_VOID__STRING,
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G_TYPE_NONE, 1,
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G_TYPE_STRING);
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/**
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* GActionGroup::action-enabled-changed:
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* @action_group: the #GActionGroup that changed
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* @action_name: the name of the action in @action_group
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* @enabled: whether the action is enabled or not
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*
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* Signals that the enabled status of the named action has changed.
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*
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* Since: 2.28
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**/
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g_action_group_signals[SIGNAL_ACTION_ENABLED_CHANGED] =
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g_signal_new (I_("action-enabled-changed"),
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G_TYPE_ACTION_GROUP,
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G_SIGNAL_RUN_LAST | G_SIGNAL_DETAILED,
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G_STRUCT_OFFSET (GActionGroupInterface,
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action_enabled_changed),
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NULL, NULL,
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_gio_marshal_VOID__STRING_BOOLEAN,
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G_TYPE_NONE, 2,
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G_TYPE_STRING,
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G_TYPE_BOOLEAN);
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/**
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* GActionGroup::action-state-changed:
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* @action_group: the #GActionGroup that changed
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* @action_name: the name of the action in @action_group
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* @value: the new value of the state
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*
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* Signals that the state of the named action has changed.
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*
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* Since: 2.28
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**/
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g_action_group_signals[SIGNAL_ACTION_STATE_CHANGED] =
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g_signal_new (I_("action-state-changed"),
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G_TYPE_ACTION_GROUP,
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G_SIGNAL_RUN_LAST | G_SIGNAL_DETAILED,
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G_STRUCT_OFFSET (GActionGroupInterface,
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action_state_changed),
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NULL, NULL,
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_gio_marshal_VOID__STRING_VARIANT,
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G_TYPE_NONE, 2,
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G_TYPE_STRING,
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G_TYPE_VARIANT);
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}
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/**
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* g_action_group_list_actions:
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* @action_group: a #GActionGroup
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*
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* Lists the actions contained within @action_group.
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*
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* The caller is responsible for freeing the list with g_strfreev() when
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* it is no longer required.
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*
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* Returns: (transfer full): a %NULL-terminated array of the names of the
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* actions in the groupb
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*
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* Since: 2.28
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**/
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gchar **
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g_action_group_list_actions (GActionGroup *action_group)
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{
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g_return_val_if_fail (G_IS_ACTION_GROUP (action_group), NULL);
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return G_ACTION_GROUP_GET_IFACE (action_group)
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->list_actions (action_group);
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}
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/**
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* g_action_group_has_action:
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* @action_group: a #GActionGroup
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* @action_name: the name of the action to check for
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*
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* Checks if the named action exists within @action_group.
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*
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* Returns: whether the named action exists
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*
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* Since: 2.28
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**/
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gboolean
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g_action_group_has_action (GActionGroup *action_group,
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const gchar *action_name)
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{
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g_return_val_if_fail (G_IS_ACTION_GROUP (action_group), FALSE);
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return G_ACTION_GROUP_GET_IFACE (action_group)
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->has_action (action_group, action_name);
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}
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/**
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* g_action_group_get_parameter_type:
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* @action_group: a #GActionGroup
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* @action_name: the name of the action to query
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*
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* Queries the type of the parameter that must be given when activating
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* the named action within @action_group.
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*
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* When activating the action using g_action_group_activate(), the
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* #GVariant given to that function must be of the type returned by this
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* function.
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*
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* In the case that this function returns %NULL, you must not give any
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* #GVariant, but %NULL instead.
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*
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* The parameter type of a particular action will never change but it is
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* possible for an action to be removed and for a new action to be added
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* with the same name but a different parameter type.
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*
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* Return value: the parameter type
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*
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* Since: 2.28
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**/
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const GVariantType *
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g_action_group_get_action_parameter_type (GActionGroup *action_group,
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const gchar *action_name)
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{
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g_return_val_if_fail (G_IS_ACTION_GROUP (action_group), NULL);
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return G_ACTION_GROUP_GET_IFACE (action_group)
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->get_action_parameter_type (action_group, action_name);
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}
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/**
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* g_action_group_get_state_type:
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* @action_group: a #GActionGroup
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* @action_name: the name of the action to query
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*
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* Queries the type of the state of the named action within
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* @action_group.
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*
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* If the action is stateful then this function returns the
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* #GVariantType of the state. All calls to g_action_group_set_state()
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* must give a #GVariant of this type and g_action_group_get_state()
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* will return a #GVariant of the same type.
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*
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* If the action is not stateful then this function will return %NULL.
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* In that case, g_action_group_get_state() will return %NULL and you
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* must not call g_action_group_set_state().
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*
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* The state type of a particular action will never change but it is
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* possible for an action to be removed and for a new action to be added
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* with the same name but a different state type.
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*
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* Returns: (transfer full): the state type, if the action is stateful
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*
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* Since: 2.28
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**/
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const GVariantType *
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g_action_group_get_action_state_type (GActionGroup *action_group,
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const gchar *action_name)
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{
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g_return_val_if_fail (G_IS_ACTION_GROUP (action_group), NULL);
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return G_ACTION_GROUP_GET_IFACE (action_group)
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->get_action_state_type (action_group, action_name);
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}
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/**
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* g_action_group_get_state_hint:
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* @action_group: a #GActionGroup
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* @action_name: the name of the action to query
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*
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* Requests a hint about the valid range of values for the state of the
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* named action within @action_group.
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*
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* If %NULL is returned it either means that the action is not stateful
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* or that there is no hint about the valid range of values for the
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* state of the action.
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*
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* If a #GVariant array is returned then each item in the array is a
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* possible value for the state. If a #GVariant pair (ie: two-tuple) is
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* returned then the tuple specifies the inclusive lower and upper bound
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* of valid values for the state.
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*
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* In any case, the information is merely a hint. It may be possible to
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* have a state value outside of the hinted range and setting a value
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* within the range may fail.
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*
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* The return value (if non-%NULL) should be freed with
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* g_variant_unref() when it is no longer required.
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*
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* Return value: (transfer full): the state range hint
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*
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* Since: 2.28
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**/
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GVariant *
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g_action_group_get_action_state_hint (GActionGroup *action_group,
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const gchar *action_name)
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{
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g_return_val_if_fail (G_IS_ACTION_GROUP (action_group), NULL);
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return G_ACTION_GROUP_GET_IFACE (action_group)
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->get_action_state_hint (action_group, action_name);
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}
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/**
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* g_action_group_get_enabled:
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* @action_group: a #GActionGroup
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* @action_name: the name of the action to query
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*
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* Checks if the named action within @action_group is currently enabled.
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*
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* An action must be enabled in order to be activated or in order to
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* have its state changed from outside callers.
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*
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* Return value: whether or not the action is currently enabled
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*
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* Since: 2.28
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**/
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gboolean
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g_action_group_get_action_enabled (GActionGroup *action_group,
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const gchar *action_name)
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{
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g_return_val_if_fail (G_IS_ACTION_GROUP (action_group), FALSE);
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return G_ACTION_GROUP_GET_IFACE (action_group)
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->get_action_enabled (action_group, action_name);
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}
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/**
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* g_action_group_get_state:
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* @action_group: a #GActionGroup
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* @action_name: the name of the action to query
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*
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* Queries the current state of the named action within @action_group.
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*
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* If the action is not stateful then %NULL will be returned. If the
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* action is stateful then the type of the return value is the type
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* given by g_action_group_get_state_type().
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*
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* The return value (if non-%NULL) should be freed with
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* g_variant_unref() when it is no longer required.
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*
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* Return value: (allow-none): the current state of the action
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*
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* Since: 2.28
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**/
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GVariant *
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g_action_group_get_action_state (GActionGroup *action_group,
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const gchar *action_name)
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{
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g_return_val_if_fail (G_IS_ACTION_GROUP (action_group), NULL);
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return G_ACTION_GROUP_GET_IFACE (action_group)
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->get_action_state (action_group, action_name);
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}
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/**
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* g_action_group_set_state:
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* @action_group: a #GActionGroup
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* @action_name: the name of the action to request the change on
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* @value: the new state
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*
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* Request for the state of the named action within @action_group to be
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* changed to @value.
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*
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* The action must be stateful and @value must be of the correct type.
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* See g_action_group_get_state_type().
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*
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* This call merely requests a change. The action may refuse to change
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* its state or may change its state to something other than @value.
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* See g_action_group_get_state_hint().
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*
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* If the @value GVariant is floating, it is consumed.
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*
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* Since: 2.28
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**/
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void
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g_action_group_change_action_state (GActionGroup *action_group,
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const gchar *action_name,
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GVariant *value)
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{
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g_return_if_fail (G_IS_ACTION_GROUP (action_group));
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g_return_if_fail (action_name != NULL);
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g_return_if_fail (value != NULL);
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G_ACTION_GROUP_GET_IFACE (action_group)
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->change_action_state (action_group, action_name, value);
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}
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/**
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* g_action_group_activate:
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* @action_group: a #GActionGroup
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* @action_name: the name of the action to activate
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* @parameter: (allow-none): parameters to the activation
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*
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* Activate the named action within @action_group.
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*
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* If the action is expecting a parameter, then the correct type of
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* parameter must be given as @parameter. If the action is expecting no
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* parameters then @parameter must be %NULL. See
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* g_action_group_get_parameter_type().
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*
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* Since: 2.28
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**/
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void
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g_action_group_activate_action (GActionGroup *action_group,
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const gchar *action_name,
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GVariant *parameter)
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{
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g_return_if_fail (G_IS_ACTION_GROUP (action_group));
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g_return_if_fail (action_name != NULL);
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G_ACTION_GROUP_GET_IFACE (action_group)
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->activate_action (action_group, action_name, parameter);
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}
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/**
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* g_action_group_action_added:
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* @action_group: a #GActionGroup
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* @action_name: the name of an action in the group
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*
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* Emits the #GActionGroup::action-added signal on @action_group.
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*
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* This function should only be called by #GActionGroup implementations.
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*
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* Since: 2.28
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**/
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void
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g_action_group_action_added (GActionGroup *action_group,
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const gchar *action_name)
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{
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g_return_if_fail (G_IS_ACTION_GROUP (action_group));
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g_return_if_fail (action_name != NULL);
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g_signal_emit (action_group,
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g_action_group_signals[SIGNAL_ACTION_ADDED],
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g_quark_try_string (action_name),
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action_name);
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}
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/**
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* g_action_group_action_removed:
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* @action_group: a #GActionGroup
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* @action_name: the name of an action in the group
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*
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* Emits the #GActionGroup::action-removed signal on @action_group.
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*
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* This function should only be called by #GActionGroup implementations.
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*
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* Since: 2.28
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**/
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void
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g_action_group_action_removed (GActionGroup *action_group,
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const gchar *action_name)
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{
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g_return_if_fail (G_IS_ACTION_GROUP (action_group));
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g_return_if_fail (action_name != NULL);
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g_signal_emit (action_group,
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g_action_group_signals[SIGNAL_ACTION_REMOVED],
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g_quark_try_string (action_name),
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action_name);
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}
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/**
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* g_action_group_action_enabled_changed:
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* @action_group: a #GActionGroup
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* @action_name: the name of an action in the group
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* @enabled: whether or not the action is now enabled
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*
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* Emits the #GActionGroup::action-enabled-changed signal on @action_group.
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*
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* This function should only be called by #GActionGroup implementations.
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*
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* Since: 2.28
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**/
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void
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g_action_group_action_enabled_changed (GActionGroup *action_group,
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const gchar *action_name,
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gboolean enabled)
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{
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g_return_if_fail (G_IS_ACTION_GROUP (action_group));
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g_return_if_fail (action_name != NULL);
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enabled = !!enabled;
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g_signal_emit (action_group,
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g_action_group_signals[SIGNAL_ACTION_ENABLED_CHANGED],
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g_quark_try_string (action_name),
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action_name,
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enabled);
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}
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/**
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* g_action_group_action_state_changed:
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* @action_group: a #GActionGroup
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* @action_name: the name of an action in the group
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* @state: the new state of the named action
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*
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* Emits the #GActionGroup::action-state-changed signal on @action_group.
|
|
*
|
|
* This function should only be called by #GActionGroup implementations.
|
|
*
|
|
* Since: 2.28
|
|
**/
|
|
void
|
|
g_action_group_action_state_changed (GActionGroup *action_group,
|
|
const gchar *action_name,
|
|
GVariant *state)
|
|
{
|
|
g_return_if_fail (G_IS_ACTION_GROUP (action_group));
|
|
g_return_if_fail (action_name != NULL);
|
|
|
|
g_signal_emit (action_group,
|
|
g_action_group_signals[SIGNAL_ACTION_STATE_CHANGED],
|
|
g_quark_try_string (action_name),
|
|
action_name,
|
|
state);
|
|
}
|