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Add 'change-state' signal to GSimpleAction

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If connected, allows the user to control the result of
g_action_change_state().
This commit is contained in:
Ryan Lortie 2011-06-29 14:35:12 +01:00 committed by Javier Jardon
parent 6383b3e709
commit 9a23ef6c2d
1 changed files with 38 additions and 1 deletions
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39
gio/gsimpleaction.c
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@ -65,6 +65,7 @@ enum
enum
{
SIGNAL_CHANGE_STATE,
SIGNAL_ACTIVATE,
NR_SIGNALS
};
@ -118,7 +119,15 @@ g_simple_action_change_state (GAction *action,
{
GSimpleAction *simple = G_SIMPLE_ACTION (action);
g_simple_action_set_state (simple, value);
/* If the user connected a signal handler then they are responsible
* for handling state changes.
*/
if (g_signal_has_handler_pending (action, g_simple_action_signals[SIGNAL_CHANGE_STATE], 0, TRUE))
g_signal_emit (action, g_simple_action_signals[SIGNAL_CHANGE_STATE], 0, value);
/* If not, then the default behaviour is to just set the state. */
else
g_simple_action_set_state (simple, value);
}
/**
@ -325,6 +334,34 @@ g_simple_action_class_init (GSimpleActionClass *class)
G_TYPE_NONE, 1,
G_TYPE_VARIANT);
/**
* GSimpleAction::change-state:
* @simple: the #GSimpleAction
* @value: (allow-none): the requested value for the state
*
* Indicates that the action just received a request to change its
* state.
*
* @value will always be of the correct state type. In the event that
* an incorrect type was given, no signal will be emitted.
*
* If no handler is connected to this signal then the default
* behaviour is to call g_simple_action_set_state() to set the state
* to the requested value. If you connect a signal handler then no
* default action is taken. If the state should change then you must
* call g_simple_action_set_state() from the handler.
*
* Since: 2.30
*/
g_simple_action_signals[SIGNAL_CHANGE_STATE] =
g_signal_new (I_("change-state"),
G_TYPE_SIMPLE_ACTION,
G_SIGNAL_RUN_LAST | G_SIGNAL_MUST_COLLECT,
0, NULL, NULL,
g_cclosure_marshal_VOID__VARIANT,
G_TYPE_NONE, 1,
G_TYPE_VARIANT);
/**
* GSimpleAction:name:
*