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glib/gio/gactiongroup.c
David King fba11825a3 docs: Fix typo in GActionGroup
2012-02-21 01:10:54 +01:00

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/*
* 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 "gactiongroup.h"
#include "gaction.h"
#include "glibintl.h"
/**
* SECTION:gactiongroup
* @title: GActionGroup
* @short_description: A group of actions
* @see_also: #GAction
*
* #GActionGroup represents a group of actions. Actions can be used to
* expose functionality in a structured way, either from one part of a
* program to another, or to the outside world. Action groups are often
* used together with a #GMenuModel that provides additional
* representation data for displaying the actions to the user, e.g. in
* a menu.
*
* The main way to interact with the actions in a GActionGroup is to
* activate them with g_action_group_activate_action(). Activating an
* action may require a #GVariant parameter. The required type of the
* parameter can be inquired with g_action_group_get_action_parameter_type().
* Actions may be disabled, see g_action_group_get_action_enabled().
* Activating a disabled action has no effect.
*
* Actions may optionally have a state in the form of a #GVariant. The
* current state of an action can be inquired with
* g_action_group_get_action_state(). Activating a stateful action may
* change its state, but it is also possible to set the state by calling
* g_action_group_change_action_state().
*
* As typical example, consider a text editing application which has an
* option to change the current font to 'bold'. A good way to represent
* this would be a stateful action, with a boolean state. Activating the
* action would toggle the state.
*
* Each action in the group has a unique name (which is a string). All
* method calls, except g_action_group_list_actions() take the name of
* an action as an argument.
*
* The #GActionGroup API is meant to be the 'public' API to the action
* group. The calls here are exactly the interaction that 'external
* forces' (eg: UI, incoming D-Bus messages, etc.) are supposed to have
* with actions. 'Internal' APIs (ie: ones meant only to be accessed by
* the action group implementation) are found on subclasses. This is
* why you will find - for example - g_action_group_get_action_enabled()
* but not an equivalent <function>set()</function> call.
*
* Signals are emitted on the action group in response to state changes
* on individual actions.
*
* Implementations of #GActionGroup should provide implementations for
* the virtual functions g_action_group_list_actions() and
* g_action_group_query_action(). The other virtual functions should
* not be implemented - their "wrappers" are actually implemented with
* calls to g_action_group_query_action().
*/
/**
* GActionGroupInterface:
* @has_action: the virtual function pointer for g_action_group_has_action()
* @list_actions: the virtual function pointer for g_action_group_list_actions()
* @get_action_parameter_type: the virtual function pointer for g_action_group_get_action_parameter_type()
* @get_action_state_type: the virtual function pointer for g_action_group_get_action_state_type()
* @get_action_state_hint: the virtual function pointer for g_action_group_get_action_state_hint()
* @get_action_enabled: the virtual function pointer for g_action_group_get_action_enabled()
* @get_action_state: the virtual function pointer for g_action_group_get_action_state()
* @change_action_state: the virtual function pointer for g_action_group_change_action_state()
* @query_action: the virtual function pointer for g_action_group_query_action()
* @activate_action: the virtual function pointer for g_action_group_activate_action()
* @change_action_state: the virtual function pointer for g_action_group_change_action_state()
* @action_added: the class closure for the #GActionGroup::action-added signal
* @action_removed: the class closure for the #GActionGroup::action-removed signal
* @action_enabled_changed: the class closure for the #GActionGroup::action-enabled-changed signal
* @action_state_changed: the class closure for the #GActionGroup::action-enabled-changed signal
*
* The virtual function table for #GActionGroup.
*
* Since: 2.28
**/
G_DEFINE_INTERFACE (GActionGroup, g_action_group, G_TYPE_OBJECT)
enum
{
SIGNAL_ACTION_ADDED,
SIGNAL_ACTION_REMOVED,
SIGNAL_ACTION_ENABLED_CHANGED,
SIGNAL_ACTION_STATE_CHANGED,
NR_SIGNALS
};
static guint g_action_group_signals[NR_SIGNALS];
static gboolean
g_action_group_real_has_action (GActionGroup *action_group,
const gchar *action_name)
{
return g_action_group_query_action (action_group, action_name, NULL, NULL, NULL, NULL, NULL);
}
static gboolean
g_action_group_real_get_action_enabled (GActionGroup *action_group,
const gchar *action_name)
{
gboolean enabled = FALSE;
g_action_group_query_action (action_group, action_name, &enabled, NULL, NULL, NULL, NULL);
return enabled;
}
static const GVariantType *
g_action_group_real_get_action_parameter_type (GActionGroup *action_group,
const gchar *action_name)
{
const GVariantType *type = NULL;
g_action_group_query_action (action_group, action_name, NULL, &type, NULL, NULL, NULL);
return type;
}
static const GVariantType *
g_action_group_real_get_action_state_type (GActionGroup *action_group,
const gchar *action_name)
{
const GVariantType *type = NULL;
g_action_group_query_action (action_group, action_name, NULL, NULL, &type, NULL, NULL);
return type;
}
static GVariant *
g_action_group_real_get_action_state_hint (GActionGroup *action_group,
const gchar *action_name)
{
GVariant *hint = NULL;
g_action_group_query_action (action_group, action_name, NULL, NULL, NULL, &hint, NULL);
return hint;
}
static GVariant *
g_action_group_real_get_action_state (GActionGroup *action_group,
const gchar *action_name)
{
GVariant *state = NULL;
g_action_group_query_action (action_group, action_name, NULL, NULL, NULL, NULL, &state);
return state;
}
static gboolean
g_action_group_real_query_action (GActionGroup *action_group,
const gchar *action_name,
gboolean *enabled,
const GVariantType **parameter_type,
const GVariantType **state_type,
GVariant **state_hint,
GVariant **state)
{
GActionGroupInterface *iface = G_ACTION_GROUP_GET_IFACE (action_group);
/* we expect implementations to override this method, but we also
* allow for implementations that existed before this method was
* introduced to override the individual accessors instead.
*
* detect the case that neither has happened and report it.
*/
if G_UNLIKELY (iface->has_action == g_action_group_real_has_action ||
iface->get_action_enabled == g_action_group_real_get_action_enabled ||
iface->get_action_parameter_type == g_action_group_real_get_action_parameter_type ||
iface->get_action_state_type == g_action_group_real_get_action_state_type ||
iface->get_action_state_hint == g_action_group_real_get_action_state_hint ||
iface->get_action_state == g_action_group_real_get_action_state)
{
g_critical ("Class '%s' implements GActionGroup interface without overriding "
"query_action() method -- bailing out to avoid infinite recursion.",
G_OBJECT_TYPE_NAME (action_group));
return FALSE;
}
if (!(* iface->has_action) (action_group, action_name))
return FALSE;
if (enabled != NULL)
*enabled = (* iface->get_action_enabled) (action_group, action_name);
if (parameter_type != NULL)
*parameter_type = (* iface->get_action_parameter_type) (action_group, action_name);
if (state_type != NULL)
*state_type = (* iface->get_action_state_type) (action_group, action_name);
if (state_hint != NULL)
*state_hint = (* iface->get_action_state_hint) (action_group, action_name);
if (state != NULL)
*state = (* iface->get_action_state) (action_group, action_name);
return TRUE;
}
static void
g_action_group_default_init (GActionGroupInterface *iface)
{
iface->has_action = g_action_group_real_has_action;
iface->get_action_enabled = g_action_group_real_get_action_enabled;
iface->get_action_parameter_type = g_action_group_real_get_action_parameter_type;
iface->get_action_state_type = g_action_group_real_get_action_state_type;
iface->get_action_state_hint = g_action_group_real_get_action_state_hint;
iface->get_action_state = g_action_group_real_get_action_state;
iface->query_action = g_action_group_real_query_action;
/**
* GActionGroup::action-added:
* @action_group: the #GActionGroup that changed
* @action_name: the name of the action in @action_group
*
* Signals that a new action was just added to the group.
* This signal is emitted after the action has been added
* and is now visible.
*
* Since: 2.28
**/
g_action_group_signals[SIGNAL_ACTION_ADDED] =
g_signal_new (I_("action-added"),
G_TYPE_ACTION_GROUP,
G_SIGNAL_RUN_LAST | G_SIGNAL_DETAILED,
G_STRUCT_OFFSET (GActionGroupInterface, action_added),
NULL, NULL,
g_cclosure_marshal_VOID__STRING,
G_TYPE_NONE, 1,
G_TYPE_STRING);
/**
* GActionGroup::action-removed:
* @action_group: the #GActionGroup that changed
* @action_name: the name of the action in @action_group
*
* Signals that an action is just about to be removed from the group.
* This signal is emitted before the action is removed, so the action
* is still visible and can be queried from the signal handler.
*
* Since: 2.28
**/
g_action_group_signals[SIGNAL_ACTION_REMOVED] =
g_signal_new (I_("action-removed"),
G_TYPE_ACTION_GROUP,
G_SIGNAL_RUN_LAST | G_SIGNAL_DETAILED,
G_STRUCT_OFFSET (GActionGroupInterface, action_removed),
NULL, NULL,
g_cclosure_marshal_VOID__STRING,
G_TYPE_NONE, 1,
G_TYPE_STRING);
/**
* GActionGroup::action-enabled-changed:
* @action_group: the #GActionGroup that changed
* @action_name: the name of the action in @action_group
* @enabled: whether the action is enabled or not
*
* Signals that the enabled status of the named action has changed.
*
* Since: 2.28
**/
g_action_group_signals[SIGNAL_ACTION_ENABLED_CHANGED] =
g_signal_new (I_("action-enabled-changed"),
G_TYPE_ACTION_GROUP,
G_SIGNAL_RUN_LAST | G_SIGNAL_DETAILED,
G_STRUCT_OFFSET (GActionGroupInterface,
action_enabled_changed),
NULL, NULL,
NULL,
G_TYPE_NONE, 2,
G_TYPE_STRING,
G_TYPE_BOOLEAN);
/**
* GActionGroup::action-state-changed:
* @action_group: the #GActionGroup that changed
* @action_name: the name of the action in @action_group
* @value: the new value of the state
*
* Signals that the state of the named action has changed.
*
* Since: 2.28
**/
g_action_group_signals[SIGNAL_ACTION_STATE_CHANGED] =
g_signal_new (I_("action-state-changed"),
G_TYPE_ACTION_GROUP,
G_SIGNAL_RUN_LAST |
G_SIGNAL_DETAILED |
G_SIGNAL_MUST_COLLECT,
G_STRUCT_OFFSET (GActionGroupInterface,
action_state_changed),
NULL, NULL,
NULL,
G_TYPE_NONE, 2,
G_TYPE_STRING,
G_TYPE_VARIANT);
}
/**
* g_action_group_list_actions:
* @action_group: a #GActionGroup
*
* Lists the actions contained within @action_group.
*
* The caller is responsible for freeing the list with g_strfreev() when
* it is no longer required.
*
* Returns: (transfer full): a %NULL-terminated array of the names of the
* actions in the groupb
*
* Since: 2.28
**/
gchar **
g_action_group_list_actions (GActionGroup *action_group)
{
g_return_val_if_fail (G_IS_ACTION_GROUP (action_group), NULL);
return G_ACTION_GROUP_GET_IFACE (action_group)
->list_actions (action_group);
}
/**
* g_action_group_has_action:
* @action_group: a #GActionGroup
* @action_name: the name of the action to check for
*
* Checks if the named action exists within @action_group.
*
* Returns: whether the named action exists
*
* Since: 2.28
**/
gboolean
g_action_group_has_action (GActionGroup *action_group,
const gchar *action_name)
{
g_return_val_if_fail (G_IS_ACTION_GROUP (action_group), FALSE);
return G_ACTION_GROUP_GET_IFACE (action_group)
->has_action (action_group, action_name);
}
/**
* g_action_group_get_action_parameter_type:
* @action_group: a #GActionGroup
* @action_name: the name of the action to query
*
* Queries the type of the parameter that must be given when activating
* the named action within @action_group.
*
* When activating the action using g_action_group_activate_action(),
* 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.
*
* The parameter type of a particular action will never change but it is
* possible for an action to be removed and for a new action to be added
* with the same name but a different parameter type.
*
* Return value: the parameter type
*
* Since: 2.28
**/
const GVariantType *
g_action_group_get_action_parameter_type (GActionGroup *action_group,
const gchar *action_name)
{
g_return_val_if_fail (G_IS_ACTION_GROUP (action_group), NULL);
return G_ACTION_GROUP_GET_IFACE (action_group)
->get_action_parameter_type (action_group, action_name);
}
/**
* g_action_group_get_action_state_type:
* @action_group: a #GActionGroup
* @action_name: the name of the action to query
*
* Queries the type of the state of the named action within
* @action_group.
*
* If the action is stateful then this function returns the
* #GVariantType of the state. All calls to
* g_action_group_change_action_state() must give a #GVariant of this
* type and g_action_group_get_action_state() will return a #GVariant
* of the same type.
*
* If the action is not stateful then this function will return %NULL.
* In that case, g_action_group_get_action_state() will return %NULL
* and you must not call g_action_group_change_action_state().
*
* The state type of a particular action will never change but it is
* possible for an action to be removed and for a new action to be added
* with the same name but a different state type.
*
* Returns: (transfer full): the state type, if the action is stateful
*
* Since: 2.28
**/
const GVariantType *
g_action_group_get_action_state_type (GActionGroup *action_group,
const gchar *action_name)
{
g_return_val_if_fail (G_IS_ACTION_GROUP (action_group), NULL);
return G_ACTION_GROUP_GET_IFACE (action_group)
->get_action_state_type (action_group, action_name);
}
/**
* g_action_group_get_action_state_hint:
* @action_group: a #GActionGroup
* @action_name: the name of the action to query
*
* Requests a hint about the valid range of values for the state of the
* named action within @action_group.
*
* 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.
*
* Return value: (transfer full): the state range hint
*
* Since: 2.28
**/
GVariant *
g_action_group_get_action_state_hint (GActionGroup *action_group,
const gchar *action_name)
{
g_return_val_if_fail (G_IS_ACTION_GROUP (action_group), NULL);
return G_ACTION_GROUP_GET_IFACE (action_group)
->get_action_state_hint (action_group, action_name);
}
/**
* g_action_group_get_action_enabled:
* @action_group: a #GActionGroup
* @action_name: the name of the action to query
*
* Checks if the named action within @action_group is currently enabled.
*
* An action must be enabled in order to be activated or in order to
* have its state changed from outside callers.
*
* Return value: whether or not the action is currently enabled
*
* Since: 2.28
**/
gboolean
g_action_group_get_action_enabled (GActionGroup *action_group,
const gchar *action_name)
{
g_return_val_if_fail (G_IS_ACTION_GROUP (action_group), FALSE);
return G_ACTION_GROUP_GET_IFACE (action_group)
->get_action_enabled (action_group, action_name);
}
/**
* g_action_group_get_action_state:
* @action_group: a #GActionGroup
* @action_name: the name of the action to query
*
* Queries the current state of the named action within @action_group.
*
* 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_group_get_action_state_type().
*
* The return value (if non-%NULL) should be freed with
* g_variant_unref() when it is no longer required.
*
* Return value: (allow-none): the current state of the action
*
* Since: 2.28
**/
GVariant *
g_action_group_get_action_state (GActionGroup *action_group,
const gchar *action_name)
{
g_return_val_if_fail (G_IS_ACTION_GROUP (action_group), NULL);
return G_ACTION_GROUP_GET_IFACE (action_group)
->get_action_state (action_group, action_name);
}
/**
* g_action_group_change_action_state:
* @action_group: a #GActionGroup
* @action_name: the name of the action to request the change on
* @value: the new state
*
* Request for the state of the named action within @action_group to be
* changed to @value.
*
* The action must be stateful and @value must be of the correct type.
* See g_action_group_get_action_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_group_get_action_state_hint().
*
* If the @value GVariant is floating, it is consumed.
*
* Since: 2.28
**/
void
g_action_group_change_action_state (GActionGroup *action_group,
const gchar *action_name,
GVariant *value)
{
g_return_if_fail (G_IS_ACTION_GROUP (action_group));
g_return_if_fail (action_name != NULL);
g_return_if_fail (value != NULL);
G_ACTION_GROUP_GET_IFACE (action_group)
->change_action_state (action_group, action_name, value);
}
/**
* g_action_group_activate_action:
* @action_group: a #GActionGroup
* @action_name: the name of the action to activate
* @parameter: (allow-none): parameters to the activation
*
* Activate the named action within @action_group.
*
* If the action is expecting a parameter, then the correct type of
* parameter must be given as @parameter. If the action is expecting no
* parameters then @parameter must be %NULL. See
* g_action_group_get_action_parameter_type().
*
* Since: 2.28
**/
void
g_action_group_activate_action (GActionGroup *action_group,
const gchar *action_name,
GVariant *parameter)
{
g_return_if_fail (G_IS_ACTION_GROUP (action_group));
g_return_if_fail (action_name != NULL);
G_ACTION_GROUP_GET_IFACE (action_group)
->activate_action (action_group, action_name, parameter);
}
/**
* g_action_group_action_added:
* @action_group: a #GActionGroup
* @action_name: the name of an action in the group
*
* Emits the #GActionGroup::action-added signal on @action_group.
*
* This function should only be called by #GActionGroup implementations.
*
* Since: 2.28
**/
void
g_action_group_action_added (GActionGroup *action_group,
const gchar *action_name)
{
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_ADDED],
g_quark_try_string (action_name),
action_name);
}
/**
* g_action_group_action_removed:
* @action_group: a #GActionGroup
* @action_name: the name of an action in the group
*
* Emits the #GActionGroup::action-removed signal on @action_group.
*
* This function should only be called by #GActionGroup implementations.
*
* Since: 2.28
**/
void
g_action_group_action_removed (GActionGroup *action_group,
const gchar *action_name)
{
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_REMOVED],
g_quark_try_string (action_name),
action_name);
}
/**
* g_action_group_action_enabled_changed:
* @action_group: a #GActionGroup
* @action_name: the name of an action in the group
* @enabled: whether or not the action is now enabled
*
* Emits the #GActionGroup::action-enabled-changed signal on @action_group.
*
* This function should only be called by #GActionGroup implementations.
*
* Since: 2.28
**/
void
g_action_group_action_enabled_changed (GActionGroup *action_group,
const gchar *action_name,
gboolean enabled)
{
g_return_if_fail (G_IS_ACTION_GROUP (action_group));
g_return_if_fail (action_name != NULL);
enabled = !!enabled;
g_signal_emit (action_group,
g_action_group_signals[SIGNAL_ACTION_ENABLED_CHANGED],
g_quark_try_string (action_name),
action_name,
enabled);
}
/**
* g_action_group_action_state_changed:
* @action_group: a #GActionGroup
* @action_name: the name of an action in the group
* @state: the new state of the named action
*
* 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);
}
/**
* g_action_group_query_action:
* @action_group: a #GActionGroup
* @action_name: the name of an action in the group
* @enabled: (out): if the action is presently enabled
* @parameter_type: (out): the parameter type, or %NULL if none needed
* @state_type: (out): the state type, or %NULL if stateless
* @state_hint: (out): the state hint, or %NULL if none
* @state: (out): the current state, or %NULL if stateless
*
* Queries all aspects of the named action within an @action_group.
*
* This function acquires the information available from
* g_action_group_has_action(), g_action_group_get_action_enabled(),
* g_action_group_get_action_parameter_type(),
* g_action_group_get_action_state_type(),
* g_action_group_get_action_state_hint() and
* g_action_group_get_action_state() with a single function call.
*
* This provides two main benefits.
*
* The first is the improvement in efficiency that comes with not having
* to perform repeated lookups of the action in order to discover
* different things about it. The second is that implementing
* #GActionGroup can now be done by only overriding this one virtual
* function.
*
* The interface provides a default implementation of this function that
* calls the individual functions, as required, to fetch the
* information. The interface also provides default implementations of
* those functions that call this function. All implementations,
* therefore, must override either this function or all of the others.
*
* If the action exists, %TRUE is returned and any of the requested
* fields (as indicated by having a non-%NULL reference passed in) are
* filled. If the action doesn't exist, %FALSE is returned and the
* fields may or may not have been modified.
*
* Returns: %TRUE if the action exists, else %FALSE
*
* Since: 2.32
**/
gboolean
g_action_group_query_action (GActionGroup *action_group,
const gchar *action_name,
gboolean *enabled,
const GVariantType **parameter_type,
const GVariantType **state_type,
GVariant **state_hint,
GVariant **state)
{
return G_ACTION_GROUP_GET_IFACE (action_group)
->query_action (action_group, action_name, enabled, parameter_type, state_type, state_hint, state);
}
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