| /* |
| * Copyright © 2010 Codethink Limited |
| * |
| * This library 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 2.1 of the License, 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, see <http://www.gnu.org/licenses/>. |
| * |
| * 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 |
| * @include: gio/gio.h |
| * @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 set() 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(). |
| */ |
| |
| /** |
| * GActionGroup: |
| * |
| * #GActionGroup is an opaque data structure and can only be accessed |
| * using the following functions. |
| **/ |
| |
| /** |
| * 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 group |
| * |
| * 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. |
| * |
| * Returns: (nullable): 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: (nullable): 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. |
| * |
| * Returns: (nullable) (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. |
| * |
| * Returns: 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. |
| * |
| * Returns: (nullable): 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: (nullable): 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) (optional): the parameter type, or %NULL if none needed |
| * @state_type: (out) (optional): the state type, or %NULL if stateless |
| * @state_hint: (out) (optional): the state hint, or %NULL if none |
| * @state: (out) (optional): 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); |
| } |
