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323 lines
10 KiB
C
323 lines
10 KiB
C
/*
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* Copyright © 2010 Codethink Limited
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at 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, see <http://www.gnu.org/licenses/>.
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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 "gsimpleaction.h"
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#include "gactionmap.h"
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#include "gaction.h"
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/**
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* GActionMap:
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*
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* `GActionMap` is an interface for action containers.
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*
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* The `GActionMap` interface is implemented by [iface@Gio.ActionGroup]
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* implementations that operate by containing a number of named
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* [iface@Gio.Action] instances, such as [class@Gio.SimpleActionGroup].
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*
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* One useful application of this interface is to map the
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* names of actions from various action groups to unique,
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* prefixed names (e.g. by prepending "app." or "win.").
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* This is the motivation for the ‘Map’ part of the interface
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* name.
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*
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* Since: 2.32
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*/
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/**
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* GActionMapInterface:
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* @lookup_action: the virtual function pointer for
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* [method@Gio.ActionMap.lookup_action]
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* @add_action: the virtual function pointer for
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* [method@Gio.ActionMap.add_action]
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* @remove_action: the virtual function pointer for
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* [method@Gio.ActionMap.remove_action]
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*
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* The virtual function table for [iface@Gio.ActionMap].
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*
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* Since: 2.32
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**/
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G_DEFINE_INTERFACE (GActionMap, g_action_map, G_TYPE_OBJECT)
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static void
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g_action_map_default_init (GActionMapInterface *iface)
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{
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}
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/**
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* g_action_map_lookup_action:
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* @action_map: an action map
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* @action_name: the name of an action
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*
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* Looks up the action with the name @action_name in @action_map.
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*
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* If no such action exists, returns `NULL`.
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*
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* Returns: (nullable) (transfer none): a [iface@Gio.Action]
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*
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* Since: 2.32
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*/
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GAction *
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g_action_map_lookup_action (GActionMap *action_map,
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const gchar *action_name)
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{
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return G_ACTION_MAP_GET_IFACE (action_map)
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->lookup_action (action_map, action_name);
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}
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/**
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* g_action_map_add_action:
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* @action_map: an action map
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* @action: a [iface@Gio.Action]
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*
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* Adds an action to the @action_map.
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*
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* If the action map already contains an action with the same name
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* as @action then the old action is dropped from the action map.
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*
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* The action map takes its own reference on @action.
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*
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* Since: 2.32
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*/
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void
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g_action_map_add_action (GActionMap *action_map,
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GAction *action)
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{
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G_ACTION_MAP_GET_IFACE (action_map)->add_action (action_map, action);
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}
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/**
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* g_action_map_remove_action:
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* @action_map: an action map
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* @action_name: the name of the action
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*
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* Removes the named action from the action map.
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*
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* If no action of this name is in the map then nothing happens.
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*
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* Since: 2.32
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*/
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void
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g_action_map_remove_action (GActionMap *action_map,
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const gchar *action_name)
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{
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G_ACTION_MAP_GET_IFACE (action_map)->remove_action (action_map, action_name);
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}
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/**
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* GActionEntry:
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* @name: the name of the action
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* @activate: the callback to connect to the "activate" signal of the action.
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* Since GLib 2.40, this can be `NULL` for stateful actions, in which case
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* the default handler is used. For boolean-stated actions with no
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* parameter, this is a toggle. For other state types (and parameter type
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* equal to the state type) this will be a function that just calls
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* @change_state (which you should provide).
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* @parameter_type: the type of the parameter that must be passed to the
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* activate function for this action, given as a single GVariant type string
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* (or `NULL` for no parameter)
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* @state: the initial state for this action, given in
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* [GVariant text format](../glib/gvariant-text-format.html). The state is parsed
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* with no extra type information, so type tags must be added to the string
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* if they are necessary. Stateless actions should give `NULL` here.
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* @change_state: the callback to connect to the "change-state" signal of the
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* action. All stateful actions should provide a handler here; stateless
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* actions should not.
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*
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* This struct defines a single action. It is for use with
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* [method@Gio.ActionMap.add_action_entries].
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*
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* The order of the items in the structure are intended to reflect
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* frequency of use. It is permissible to use an incomplete initialiser
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* in order to leave some of the later values as `NULL`. All values
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* after @name are optional. Additional optional fields may be added in
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* the future.
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*
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* See [method@Gio.ActionMap.add_action_entries] for an example.
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**/
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/**
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* g_action_map_add_action_entries:
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* @action_map: an action map
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* @entries: (array length=n_entries) (element-type GActionEntry): a pointer to
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* the first item in an array of [struct@Gio.ActionEntry] structs
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* @n_entries: the length of @entries, or -1 if @entries is `NULL`-terminated
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* @user_data: the user data for signal connections
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*
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* A convenience function for creating multiple [class@Gio.SimpleAction]
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* instances and adding them to a [iface@Gio.ActionMap].
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*
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* Each action is constructed as per one [struct@Gio.ActionEntry].
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*
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* ```c
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* static void
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* activate_quit (GSimpleAction *simple,
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* GVariant *parameter,
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* gpointer user_data)
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* {
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* exit (0);
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* }
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*
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* static void
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* activate_print_string (GSimpleAction *simple,
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* GVariant *parameter,
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* gpointer user_data)
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* {
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* g_print ("%s\n", g_variant_get_string (parameter, NULL));
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* }
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*
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* static GActionGroup *
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* create_action_group (void)
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* {
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* const GActionEntry entries[] = {
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* { "quit", activate_quit },
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* { "print-string", activate_print_string, "s" }
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* };
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* GSimpleActionGroup *group;
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*
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* group = g_simple_action_group_new ();
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* g_action_map_add_action_entries (G_ACTION_MAP (group), entries, G_N_ELEMENTS (entries), NULL);
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*
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* return G_ACTION_GROUP (group);
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* }
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* ```
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*
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* Since: 2.32
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*/
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void
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g_action_map_add_action_entries (GActionMap *action_map,
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const GActionEntry *entries,
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gint n_entries,
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gpointer user_data)
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{
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g_return_if_fail (G_IS_ACTION_MAP (action_map));
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g_return_if_fail (entries != NULL || n_entries == 0);
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for (int i = 0; n_entries < 0 ? entries[i].name != NULL : i < n_entries; i++)
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{
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const GActionEntry *entry = &entries[i];
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const GVariantType *parameter_type;
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GSimpleAction *action;
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if (entry->parameter_type)
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{
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if (!g_variant_type_string_is_valid (entry->parameter_type))
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{
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g_critical ("g_action_map_add_entries: the type "
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"string '%s' given as the parameter type for "
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"action '%s' is not a valid GVariant type "
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"string. This action will not be added.",
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entry->parameter_type, entry->name);
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return;
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}
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parameter_type = G_VARIANT_TYPE (entry->parameter_type);
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}
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else
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parameter_type = NULL;
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if (entry->state)
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{
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GError *error = NULL;
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GVariant *state;
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state = g_variant_parse (NULL, entry->state, NULL, NULL, &error);
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if (state == NULL)
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{
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g_critical ("g_action_map_add_entries: GVariant could "
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"not parse the state value given for action '%s' "
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"('%s'): %s. This action will not be added.",
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entry->name, entry->state, error->message);
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g_error_free (error);
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continue;
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}
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action = g_simple_action_new_stateful (entry->name,
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parameter_type,
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state);
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g_variant_unref (state);
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}
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else
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{
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action = g_simple_action_new (entry->name,
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parameter_type);
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}
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if (entry->activate != NULL)
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g_signal_connect (action, "activate",
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G_CALLBACK (entry->activate), user_data);
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if (entry->change_state != NULL)
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g_signal_connect (action, "change-state",
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G_CALLBACK (entry->change_state), user_data);
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g_action_map_add_action (action_map, G_ACTION (action));
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g_object_unref (action);
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}
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}
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/**
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* g_action_map_remove_action_entries:
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* @action_map: The [iface@Gio.ActionMap]
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* @entries: (array length=n_entries) (element-type GActionEntry): a pointer to
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* the first item in an array of [struct@Gio.ActionEntry] structs
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* @n_entries: the length of @entries, or -1 if @entries is `NULL`-terminated
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*
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* Remove actions from a [iface@Gio.ActionMap]. This is meant as the reverse of
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* [method@Gio.ActionMap.add_action_entries].
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*
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*
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* ```c
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* static const GActionEntry entries[] = {
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* { "quit", activate_quit },
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* { "print-string", activate_print_string, "s" }
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* };
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*
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* void
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* add_actions (GActionMap *map)
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* {
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* g_action_map_add_action_entries (map, entries, G_N_ELEMENTS (entries), NULL);
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* }
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*
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* void
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* remove_actions (GActionMap *map)
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* {
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* g_action_map_remove_action_entries (map, entries, G_N_ELEMENTS (entries));
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* }
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* ```
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*
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* Since: 2.78
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*/
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void
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g_action_map_remove_action_entries (GActionMap *action_map,
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const GActionEntry entries[],
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gint n_entries)
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{
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g_return_if_fail (G_IS_ACTION_MAP (action_map));
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g_return_if_fail (entries != NULL || n_entries == 0);
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for (int i = 0; n_entries < 0 ? entries[i].name != NULL : i < n_entries; i++)
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g_action_map_remove_action (action_map, entries[i].name);
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}
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