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bde41dacf7
GAction is a read-only interface (as is visible by the lack of _set() functions on its API). The properties on the interface currently force implementors to support writing of the properties at construct time, however. Lift that restriction. Take advantage of this from GSimpleAction by nuking the set_property function and setting the fields directly in the constructor.
375 lines
12 KiB
C
375 lines
12 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 "gaction.h"
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#include "glibintl.h"
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G_DEFINE_INTERFACE (GAction, g_action, G_TYPE_OBJECT)
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/**
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* SECTION:gaction
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* @title: GAction
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* @short_description: An action
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*
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* #GAction represents a single named action.
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*
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* The main interface to an action is that it can be activated with
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* g_action_activate(). This results in the 'activate' signal being
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* emitted. An activation has a #GVariant parameter (which may be
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* %NULL). The correct type for the parameter is determined by a static
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* parameter type (which is given at construction time).
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*
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* An action may optionally have a state, in which case the state may be
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* set with g_action_change_state(). This call takes a #GVariant. The
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* correct type for the state is determined by a static state type
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* (which is given at construction time).
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*
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* The state may have a hint associated with it, specifying its valid
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* range.
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*
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* #GAction is merely the interface to the concept of an action, as
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* described above. Various implementations of actions exist, including
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* #GSimpleAction and #GtkAction.
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*
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* In all cases, the implementing class is responsible for storing the
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* name of the action, the parameter type, the enabled state, the
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* optional state type and the state and emitting the appropriate
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* signals when these change. The implementor responsible for filtering
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* calls to g_action_activate() and g_action_change_state() for type
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* safety and for the state being enabled.
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*
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* Probably the only useful thing to do with a #GAction is to put it
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* inside of a #GSimpleActionGroup.
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**/
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void
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g_action_default_init (GActionInterface *iface)
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{
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/**
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* GAction:name:
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*
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* The name of the action. This is mostly meaningful for identifying
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* the action once it has been added to a #GActionGroup.
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*
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* Since: 2.28
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**/
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g_object_interface_install_property (iface,
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g_param_spec_string ("name",
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P_("Action Name"),
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P_("The name used to invoke the action"),
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NULL,
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G_PARAM_READABLE |
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G_PARAM_STATIC_STRINGS));
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/**
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* GAction:parameter-type:
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*
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* The type of the parameter that must be given when activating the
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* action.
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*
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* Since: 2.28
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**/
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g_object_interface_install_property (iface,
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g_param_spec_boxed ("parameter-type",
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P_("Parameter Type"),
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P_("The type of GVariant passed to activate()"),
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G_TYPE_VARIANT_TYPE,
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G_PARAM_READABLE |
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G_PARAM_STATIC_STRINGS));
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/**
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* GAction:enabled:
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*
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* If @action is currently enabled.
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*
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* If the action is disabled then calls to g_action_activate() and
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* g_action_change_state() have no effect.
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*
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* Since: 2.28
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**/
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g_object_interface_install_property (iface,
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g_param_spec_boolean ("enabled",
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P_("Enabled"),
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P_("If the action can be activated"),
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TRUE,
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G_PARAM_READABLE |
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G_PARAM_STATIC_STRINGS));
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/**
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* GAction:state-type:
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*
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* The #GVariantType of the state that the action has, or %NULL if the
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* action is stateless.
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*
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* Since: 2.28
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**/
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g_object_interface_install_property (iface,
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g_param_spec_boxed ("state-type",
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P_("State Type"),
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P_("The type of the state kept by the action"),
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G_TYPE_VARIANT_TYPE,
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G_PARAM_READABLE |
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G_PARAM_STATIC_STRINGS));
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/**
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* GAction:state:
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*
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* The state of the action, or %NULL if the action is stateless.
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*
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* Since: 2.28
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**/
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g_object_interface_install_property (iface,
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g_param_spec_variant ("state",
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P_("State"),
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P_("The state the action is in"),
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G_VARIANT_TYPE_ANY,
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NULL,
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G_PARAM_READABLE |
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G_PARAM_STATIC_STRINGS));
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}
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/**
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* g_action_change_state:
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* @action: a #GAction
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* @value: the new state
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*
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* Request for the state of @action to be 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_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_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: 2.30
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**/
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void
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g_action_change_state (GAction *action,
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GVariant *value)
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{
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const GVariantType *state_type;
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g_return_if_fail (G_IS_ACTION (action));
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g_return_if_fail (value != NULL);
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state_type = g_action_get_state_type (action);
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g_return_if_fail (state_type != NULL);
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g_return_if_fail (g_variant_is_of_type (value, state_type));
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g_variant_ref_sink (value);
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G_ACTION_GET_IFACE (action)
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->change_state (action, value);
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g_variant_unref (value);
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}
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/**
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* g_action_get_state:
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* @action: a #GAction
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*
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* Queries the current state of @action.
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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_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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* Returns: (transfer full): 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_get_state (GAction *action)
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{
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g_return_val_if_fail (G_IS_ACTION (action), NULL);
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return G_ACTION_GET_IFACE (action)
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->get_state (action);
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}
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/**
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* g_action_get_name:
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* @action: a #GAction
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*
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* Queries the name of @action.
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*
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* Returns: the name of the action
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*
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* Since: 2.28
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**/
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const gchar *
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g_action_get_name (GAction *action)
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{
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g_return_val_if_fail (G_IS_ACTION (action), NULL);
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return G_ACTION_GET_IFACE (action)
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->get_name (action);
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}
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/**
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* g_action_get_parameter_type:
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* @action: a #GAction
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*
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* Queries the type of the parameter that must be given when activating
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* @action.
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*
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* When activating the action using g_action_activate(), the #GVariant
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* given to that function must be of the type returned by this 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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* Returns: (allow-none): 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_get_parameter_type (GAction *action)
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{
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g_return_val_if_fail (G_IS_ACTION (action), NULL);
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return G_ACTION_GET_IFACE (action)
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->get_parameter_type (action);
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}
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/**
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* g_action_get_state_type:
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* @action: a #GAction
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*
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* Queries the type of the state of @action.
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*
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* If the action is stateful (e.g. created with
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* g_simple_action_new_stateful()) then this function returns the
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* #GVariantType of the state. This is the type of the initial value
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* given as the state. All calls to g_action_change_state() must give a
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* #GVariant of this type and g_action_get_state() will return a
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* #GVariant of the same type.
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*
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* If the action is not stateful (e.g. created with g_simple_action_new())
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* then this function will return %NULL. In that case, g_action_get_state()
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* will return %NULL and you must not call g_action_change_state().
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*
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* Returns: (allow-none): 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_get_state_type (GAction *action)
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{
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g_return_val_if_fail (G_IS_ACTION (action), NULL);
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return G_ACTION_GET_IFACE (action)
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->get_state_type (action);
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}
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/**
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* g_action_get_state_hint:
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* @action: a #GAction
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*
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* Requests a hint about the valid range of values for the state of
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* @action.
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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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* Returns: (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_get_state_hint (GAction *action)
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{
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g_return_val_if_fail (G_IS_ACTION (action), NULL);
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return G_ACTION_GET_IFACE (action)
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->get_state_hint (action);
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}
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/**
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* g_action_get_enabled:
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* @action: a #GAction
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*
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* Checks if @action 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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* Returns: whether the action is 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_get_enabled (GAction *action)
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{
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g_return_val_if_fail (G_IS_ACTION (action), FALSE);
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return G_ACTION_GET_IFACE (action)
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->get_enabled (action);
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}
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/**
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* g_action_activate:
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* @action: a #GAction
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* @parameter: (allow-none): the parameter to the activation
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*
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* Activates the action.
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*
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* @parameter must be the correct type of parameter for the action (ie:
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* the parameter type given at construction time). If the parameter
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* type was %NULL then @parameter must also be %NULL.
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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_activate (GAction *action,
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GVariant *parameter)
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{
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g_return_if_fail (G_IS_ACTION (action));
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if (parameter != NULL)
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g_variant_ref_sink (parameter);
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G_ACTION_GET_IFACE (action)
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->activate (action, parameter);
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if (parameter != NULL)
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g_variant_unref (parameter);
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}
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