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Diffstat (limited to 'src/st/st-generic-accessible.c')
| -rw-r--r-- | src/st/st-generic-accessible.c | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/src/st/st-generic-accessible.c b/src/st/st-generic-accessible.c new file mode 100644 index 0000000..e6cb393 --- /dev/null +++ b/src/st/st-generic-accessible.c @@ -0,0 +1,246 @@ +/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */ +/* + * st-generic-accessible.c: generic accessible + * + * Copyright 2013 Igalia, S.L. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU Lesser General Public License, + * version 2.1, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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 program. If not, see <http://www.gnu.org/licenses/>. + */ + +/** + * SECTION:st-generic-accessible + * @short_description: An accessible class with signals for + * implementing specific Atk interfaces + * + * #StGenericAccessible is mainly a workaround for the current lack of + * of a proper support for GValue at javascript. See bug#703412 for + * more information. We implement the accessible interfaces, but proxy + * the virtual functions into signals, which gjs can catch. + * + * #StGenericAccessible is an #StWidgetAccessible + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include "st-generic-accessible.h" + +static void atk_value_iface_init (AtkValueIface *iface); + +G_DEFINE_TYPE_WITH_CODE(StGenericAccessible, + st_generic_accessible, + ST_TYPE_WIDGET_ACCESSIBLE, + G_IMPLEMENT_INTERFACE (ATK_TYPE_VALUE, + atk_value_iface_init)); +/* Signals */ +enum +{ + GET_CURRENT_VALUE, + GET_MAXIMUM_VALUE, + GET_MINIMUM_VALUE, + SET_CURRENT_VALUE, + GET_MINIMUM_INCREMENT, + LAST_SIGNAL +}; + +static guint st_generic_accessible_signals [LAST_SIGNAL] = { 0 }; + +static void +st_generic_accessible_init (StGenericAccessible *accessible) +{ +} + +static void +st_generic_accessible_class_init (StGenericAccessibleClass *klass) +{ + /** + * StGenericAccessible::get-current-value: + * @self: the #StGenericAccessible + * + * Emitted when atk_value_get_current_value() is called on + * @self. Right now we only care about doubles, so the value is + * directly returned by the signal. + * + * Returns: value of the current element. + */ + st_generic_accessible_signals[GET_CURRENT_VALUE] = + g_signal_new ("get-current-value", + G_TYPE_FROM_CLASS (klass), + G_SIGNAL_RUN_LAST, + 0, + NULL, NULL, NULL, + G_TYPE_DOUBLE, 0); + + /** + * StGenericAccessible::get-maximum-value: + * @self: the #StGenericAccessible + * + * Emitted when atk_value_get_maximum_value() is called on + * @self. Right now we only care about doubles, so the value is + * directly returned by the signal. + * + * Returns: maximum value of the accessible. + */ + st_generic_accessible_signals[GET_MAXIMUM_VALUE] = + g_signal_new ("get-maximum-value", + G_TYPE_FROM_CLASS (klass), + G_SIGNAL_RUN_LAST, + 0, + NULL, NULL, NULL, + G_TYPE_DOUBLE, 0); + + /** + * StGenericAccessible::get-minimum-value: + * @self: the #StGenericAccessible + * + * Emitted when atk_value_get_current_value() is called on + * @self. Right now we only care about doubles, so the value is + * directly returned by the signal. + * + * Returns: minimum value of the accessible. + */ + st_generic_accessible_signals[GET_MINIMUM_VALUE] = + g_signal_new ("get-minimum-value", + G_TYPE_FROM_CLASS (klass), + G_SIGNAL_RUN_LAST, + 0, + NULL, NULL, NULL, + G_TYPE_DOUBLE, 0); + + /** + * StGenericAccessible::get-minimum-increment: + * @self: the #StGenericAccessible + * + * Emitted when atk_value_get_minimum_increment() is called on + * @self. Right now we only care about doubles, so the value is + * directly returned by the signal. + * + * Returns: value of the current element. + */ + st_generic_accessible_signals[GET_MINIMUM_INCREMENT] = + g_signal_new ("get-minimum-increment", + G_TYPE_FROM_CLASS (klass), + G_SIGNAL_RUN_LAST, + 0, + NULL, NULL, NULL, + G_TYPE_DOUBLE, 0); + + /** + * StGenericAccessible::set-current-value: + * @self: the #StGenericAccessible + * @new_value: the new value for the accessible + * + * Emitted when atk_value_set_current_value() is called on + * @self. Right now we only care about doubles, so the value is + * directly returned by the signal. + */ + st_generic_accessible_signals[SET_CURRENT_VALUE] = + g_signal_new ("set-current-value", + G_TYPE_FROM_CLASS (klass), + G_SIGNAL_RUN_LAST, + 0, + NULL, NULL, NULL, + G_TYPE_NONE, 1, G_TYPE_DOUBLE); + +} + +static void +st_generic_accessible_get_current_value (AtkValue *obj, + GValue *value) +{ + gdouble current_value = 0; + + g_value_init (value, G_TYPE_DOUBLE); + g_signal_emit (G_OBJECT (obj), st_generic_accessible_signals[GET_CURRENT_VALUE], 0, ¤t_value); + g_value_set_double (value, current_value); +} + +static void +st_generic_accessible_get_maximum_value (AtkValue *obj, + GValue *value) +{ + gdouble current_value = 0; + + g_value_init (value, G_TYPE_DOUBLE); + g_signal_emit (G_OBJECT (obj), st_generic_accessible_signals[GET_MAXIMUM_VALUE], 0, ¤t_value); + g_value_set_double (value, current_value); +} + +static void +st_generic_accessible_get_minimum_value (AtkValue *obj, + GValue *value) +{ + gdouble current_value = 0; + + g_value_init (value, G_TYPE_DOUBLE); + g_signal_emit (G_OBJECT (obj), st_generic_accessible_signals[GET_MINIMUM_VALUE], 0, ¤t_value); + g_value_set_double (value, current_value); +} + +static void +st_generic_accessible_get_minimum_increment (AtkValue *obj, + GValue *value) +{ + gdouble current_value = 0; + + g_value_init (value, G_TYPE_DOUBLE); + g_signal_emit (G_OBJECT (obj), st_generic_accessible_signals[GET_MINIMUM_INCREMENT], 0, ¤t_value); + g_value_set_double (value, current_value); +} + +static gboolean +st_generic_accessible_set_current_value (AtkValue *obj, + const GValue *value) +{ + gdouble current_value = 0; + + current_value = g_value_get_double (value); + g_signal_emit (G_OBJECT (obj), st_generic_accessible_signals[SET_CURRENT_VALUE], 0, current_value); + + return TRUE; // we assume that the value was properly set +} + +static void +atk_value_iface_init (AtkValueIface *iface) +{ + iface->get_current_value = st_generic_accessible_get_current_value; + iface->get_maximum_value = st_generic_accessible_get_maximum_value; + iface->get_minimum_value = st_generic_accessible_get_minimum_value; + iface->get_minimum_increment = st_generic_accessible_get_minimum_increment; + iface->set_current_value = st_generic_accessible_set_current_value; +} + +/** + * st_generic_accessible_new_for_actor: + * @actor: a #Clutter Actor + * + * Create a new #StGenericAccessible for @actor. + * + * This is useful only for custom widgets that need a proxy for #AtkObject. + * + * Returns: (transfer full): a new #AtkObject + */ +AtkObject* +st_generic_accessible_new_for_actor (ClutterActor *actor) +{ + AtkObject *accessible = NULL; + + g_return_val_if_fail (CLUTTER_IS_ACTOR (actor), NULL); + + accessible = ATK_OBJECT (g_object_new (ST_TYPE_GENERIC_ACCESSIBLE, + NULL)); + atk_object_initialize (accessible, actor); + + return accessible; +} |