2 * Copyright © 2010 Codethink Limited
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU Lesser General Public License as published
6 * by the Free Software Foundation; either version 2 of the licence or (at
7 * your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General
15 * Public License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
17 * Boston, MA 02111-1307, USA.
19 * Authors: Ryan Lortie <desrt@desrt.ca>
23 #include "gactiongroup.h"
25 #include "gio-marshal.h"
29 * SECTION:gactiongroup
30 * @title: GActionGroup
31 * @short_description: a group of actions
33 * #GActionGroup represents a group of actions.
35 * Each action in the group has a unique name (which is a string). All
36 * method calls, except g_action_group_list_actions() take the name of
37 * an action as an argument.
39 * The #GActionGroup API is meant to be the 'public' API to the action
40 * group. The calls here are exactly the interaction that 'external
41 * forces' (eg: UI, incoming D-Bus messages, etc.) are supposed to have
42 * with actions. 'Internal' APIs (ie: ones meant only to be accessed by
43 * the action group implementation) are found on subclasses. This is
44 * why you will find -- for example -- g_action_group_get_enabled() but
45 * not an equivalent <function>set()</function> call.
47 * Signals are emitted on the action group in response to state changes
48 * on individual actions.
51 G_DEFINE_INTERFACE (GActionGroup, g_action_group, G_TYPE_OBJECT)
56 SIGNAL_ACTION_REMOVED,
57 SIGNAL_ACTION_ENABLED_CHANGED,
58 SIGNAL_ACTION_STATE_CHANGED,
62 static guint g_action_group_signals[NR_SIGNALS];
65 g_action_group_default_init (GActionGroupInterface *class)
68 * GActionGroup::action-added:
69 * @action_group: the #GActionGroup that changed
70 * @action_name: the name of the action in @action_group
72 * Signals that a new action was just added to the group. This signal
73 * is emitted after the action has been added and is now visible.
77 g_action_group_signals[SIGNAL_ACTION_ADDED] =
78 g_signal_new (I_("action-added"),
80 G_SIGNAL_RUN_LAST | G_SIGNAL_DETAILED,
81 G_STRUCT_OFFSET (GActionGroupInterface, action_added),
83 g_cclosure_marshal_VOID__STRING,
88 * GActionGroup::action-removed:
89 * @action_group: the #GActionGroup that changed
90 * @action_name: the name of the action in @action_group
92 * Signals that an action is just about to be removed from the group.
93 * This signal is emitted before the action is removed, so the action
94 * is still visible and can be queried from the signal handler.
98 g_action_group_signals[SIGNAL_ACTION_REMOVED] =
99 g_signal_new (I_("action-removed"),
101 G_SIGNAL_RUN_LAST | G_SIGNAL_DETAILED,
102 G_STRUCT_OFFSET (GActionGroupInterface, action_removed),
104 g_cclosure_marshal_VOID__STRING,
110 * GActionGroup::action-enabled-changed:
111 * @action_group: the #GActionGroup that changed
112 * @action_name: the name of the action in @action_group
113 * @enabled: whether the action is enabled or not
115 * Signals that the enabled status of the named action has changed.
119 g_action_group_signals[SIGNAL_ACTION_ENABLED_CHANGED] =
120 g_signal_new (I_("action-enabled-changed"),
122 G_SIGNAL_RUN_LAST | G_SIGNAL_DETAILED,
123 G_STRUCT_OFFSET (GActionGroupInterface,
124 action_enabled_changed),
126 _gio_marshal_VOID__STRING_BOOLEAN,
132 * GActionGroup::action-state-changed:
133 * @action_group: the #GActionGroup that changed
134 * @action_name: the name of the action in @action_group
135 * @value: the new value of the state
137 * Signals that the state of the named action has changed.
141 g_action_group_signals[SIGNAL_ACTION_STATE_CHANGED] =
142 g_signal_new (I_("action-state-changed"),
144 G_SIGNAL_RUN_LAST | G_SIGNAL_DETAILED,
145 G_STRUCT_OFFSET (GActionGroupInterface,
146 action_state_changed),
148 _gio_marshal_VOID__STRING_VARIANT,
155 * g_action_group_list_actions:
156 * @action_group: a #GActionGroup
158 * Lists the actions contained within @action_group.
160 * The caller is responsible for freeing the list with g_strfreev() when
161 * it is no longer required.
163 * Returns: (transfer full): a %NULL-terminated array of the names of the
164 * actions in the groupb
169 g_action_group_list_actions (GActionGroup *action_group)
171 g_return_val_if_fail (G_IS_ACTION_GROUP (action_group), NULL);
173 return G_ACTION_GROUP_GET_IFACE (action_group)
174 ->list_actions (action_group);
178 * g_action_group_has_action:
179 * @action_group: a #GActionGroup
180 * @action_name: the name of the action to check for
182 * Checks if the named action exists within @action_group.
184 * Returns: whether the named action exists
189 g_action_group_has_action (GActionGroup *action_group,
190 const gchar *action_name)
192 g_return_val_if_fail (G_IS_ACTION_GROUP (action_group), FALSE);
194 return G_ACTION_GROUP_GET_IFACE (action_group)
195 ->has_action (action_group, action_name);
199 * g_action_group_get_parameter_type:
200 * @action_group: a #GActionGroup
201 * @action_name: the name of the action to query
203 * Queries the type of the parameter that must be given when activating
204 * the named action within @action_group.
206 * When activating the action using g_action_group_activate(), the
207 * #GVariant given to that function must be of the type returned by this
210 * In the case that this function returns %NULL, you must not give any
211 * #GVariant, but %NULL instead.
213 * The parameter type of a particular action will never change but it is
214 * possible for an action to be removed and for a new action to be added
215 * with the same name but a different parameter type.
217 * Return value: the parameter type
222 g_action_group_get_parameter_type (GActionGroup *action_group,
223 const gchar *action_name)
225 g_return_val_if_fail (G_IS_ACTION_GROUP (action_group), NULL);
227 return G_ACTION_GROUP_GET_IFACE (action_group)
228 ->get_parameter_type (action_group, action_name);
232 * g_action_group_get_state_type:
233 * @action_group: a #GActionGroup
234 * @action_name: the name of the action to query
236 * Queries the type of the state of the named action within
239 * If the action is stateful then this function returns the
240 * #GVariantType of the state. All calls to g_action_group_set_state()
241 * must give a #GVariant of this type and g_action_group_get_state()
242 * will return a #GVariant of the same type.
244 * If the action is not stateful then this function will return %NULL.
245 * In that case, g_action_group_get_state() will return %NULL and you
246 * must not call g_action_group_set_state().
248 * The state type of a particular action will never change but it is
249 * possible for an action to be removed and for a new action to be added
250 * with the same name but a different state type.
252 * Returns: (transfer full): the state type, if the action is stateful
257 g_action_group_get_state_type (GActionGroup *action_group,
258 const gchar *action_name)
260 g_return_val_if_fail (G_IS_ACTION_GROUP (action_group), NULL);
262 return G_ACTION_GROUP_GET_IFACE (action_group)
263 ->get_state_type (action_group, action_name);
267 * g_action_group_get_state_hint:
268 * @action_group: a #GActionGroup
269 * @action_name: the name of the action to query
271 * Requests a hint about the valid range of values for the state of the
272 * named action within @action_group.
274 * If %NULL is returned it either means that the action is not stateful
275 * or that there is no hint about the valid range of values for the
276 * state of the action.
278 * If a #GVariant array is returned then each item in the array is a
279 * possible value for the state. If a #GVariant pair (ie: two-tuple) is
280 * returned then the tuple specifies the inclusive lower and upper bound
281 * of valid values for the state.
283 * In any case, the information is merely a hint. It may be possible to
284 * have a state value outside of the hinted range and setting a value
285 * within the range may fail.
287 * The return value (if non-%NULL) should be freed with
288 * g_variant_unref() when it is no longer required.
290 * Return value: (transfer full): the state range hint
295 g_action_group_get_state_hint (GActionGroup *action_group,
296 const gchar *action_name)
298 g_return_val_if_fail (G_IS_ACTION_GROUP (action_group), NULL);
300 return G_ACTION_GROUP_GET_IFACE (action_group)
301 ->get_state_hint (action_group, action_name);
305 * g_action_group_get_enabled:
306 * @action_group: a #GActionGroup
307 * @action_name: the name of the action to query
309 * Checks if the named action within @action_group is currently enabled.
311 * An action must be enabled in order to be activated or in order to
312 * have its state changed from outside callers.
314 * Return value: whether or not the action is currently enabled
319 g_action_group_get_enabled (GActionGroup *action_group,
320 const gchar *action_name)
322 g_return_val_if_fail (G_IS_ACTION_GROUP (action_group), FALSE);
324 return G_ACTION_GROUP_GET_IFACE (action_group)
325 ->get_enabled (action_group, action_name);
329 * g_action_group_get_state:
330 * @action_group: a #GActionGroup
331 * @action_name: the name of the action to query
333 * Queries the current state of the named action within @action_group.
335 * If the action is not stateful then %NULL will be returned. If the
336 * action is stateful then the type of the return value is the type
337 * given by g_action_group_get_state_type().
339 * The return value (if non-%NULL) should be freed with
340 * g_variant_unref() when it is no longer required.
342 * Return value: (allow-none): the current state of the action
347 g_action_group_get_state (GActionGroup *action_group,
348 const gchar *action_name)
350 g_return_val_if_fail (G_IS_ACTION_GROUP (action_group), NULL);
352 return G_ACTION_GROUP_GET_IFACE (action_group)
353 ->get_state (action_group, action_name);
357 * g_action_group_set_state:
358 * @action_group: a #GActionGroup
359 * @action_name: the name of the action to request the change on
360 * @value: the new state
362 * Request for the state of the named action within @action_group to be
365 * The action must be stateful and @value must be of the correct type.
366 * See g_action_group_get_state_type().
368 * This call merely requests a change. The action may refuse to change
369 * its state or may change its state to something other than @value.
370 * See g_action_group_get_state_hint().
372 * If the @value GVariant is floating, it is consumed.
377 g_action_group_set_state (GActionGroup *action_group,
378 const gchar *action_name,
381 g_return_if_fail (G_IS_ACTION_GROUP (action_group));
382 g_return_if_fail (action_name != NULL);
383 g_return_if_fail (value != NULL);
385 G_ACTION_GROUP_GET_IFACE (action_group)
386 ->set_state (action_group, action_name, value);
390 * g_action_group_activate:
391 * @action_group: a #GActionGroup
392 * @action_name: the name of the action to activate
393 * @parameter: (allow-none): parameters to the activation
395 * Activate the named action within @action_group.
397 * If the action is expecting a parameter, then the correct type of
398 * parameter must be given as @parameter. If the action is expecting no
399 * parameters then @parameter must be %NULL. See
400 * g_action_group_get_parameter_type().
405 g_action_group_activate (GActionGroup *action_group,
406 const gchar *action_name,
409 g_return_if_fail (G_IS_ACTION_GROUP (action_group));
410 g_return_if_fail (action_name != NULL);
412 G_ACTION_GROUP_GET_IFACE (action_group)
413 ->activate (action_group, action_name, parameter);
417 * g_action_group_action_added:
418 * @action_group: a #GActionGroup
419 * @action_name: the name of an action in the group
421 * Emits the #GActionGroup::action-added signal on @action_group.
423 * This function should only be called by #GActionGroup implementations.
428 g_action_group_action_added (GActionGroup *action_group,
429 const gchar *action_name)
431 g_return_if_fail (G_IS_ACTION_GROUP (action_group));
432 g_return_if_fail (action_name != NULL);
434 g_signal_emit (action_group,
435 g_action_group_signals[SIGNAL_ACTION_ADDED],
436 g_quark_try_string (action_name),
441 * g_action_group_action_removed:
442 * @action_group: a #GActionGroup
443 * @action_name: the name of an action in the group
445 * Emits the #GActionGroup::action-removed signal on @action_group.
447 * This function should only be called by #GActionGroup implementations.
452 g_action_group_action_removed (GActionGroup *action_group,
453 const gchar *action_name)
455 g_return_if_fail (G_IS_ACTION_GROUP (action_group));
456 g_return_if_fail (action_name != NULL);
458 g_signal_emit (action_group,
459 g_action_group_signals[SIGNAL_ACTION_REMOVED],
460 g_quark_try_string (action_name),
465 * g_action_group_action_enabled_changed:
466 * @action_group: a #GActionGroup
467 * @action_name: the name of an action in the group
468 * @enabled: whether or not the action is now enabled
470 * Emits the #GActionGroup::action-enabled-changed signal on @action_group.
472 * This function should only be called by #GActionGroup implementations.
477 g_action_group_action_enabled_changed (GActionGroup *action_group,
478 const gchar *action_name,
481 g_return_if_fail (G_IS_ACTION_GROUP (action_group));
482 g_return_if_fail (action_name != NULL);
486 g_signal_emit (action_group,
487 g_action_group_signals[SIGNAL_ACTION_ENABLED_CHANGED],
488 g_quark_try_string (action_name),
494 * g_action_group_action_state_changed:
495 * @action_group: a #GActionGroup
496 * @action_name: the name of an action in the group
497 * @state: the new state of the named action
499 * Emits the #GActionGroup::action-state-changed signal on @action_group.
501 * This function should only be called by #GActionGroup implementations.
506 g_action_group_action_state_changed (GActionGroup *action_group,
507 const gchar *action_name,
510 g_return_if_fail (G_IS_ACTION_GROUP (action_group));
511 g_return_if_fail (action_name != NULL);
513 g_signal_emit (action_group,
514 g_action_group_signals[SIGNAL_ACTION_STATE_CHANGED],
515 g_quark_try_string (action_name),