/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */ /* eel-accessibility.h - Utility functions for accessibility Copyright (C) 2002 Anders Carlsson, Sun Microsystems, Inc. The Eel Library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The Eel Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the Eel Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. Authors: Anders Carlsson Michael Meeks */ #include #include #include #include void eel_accessibility_set_up_label_widget_relation (GtkWidget *label, GtkWidget *widget) { AtkObject *atk_widget, *atk_label; atk_label = gtk_widget_get_accessible (label); atk_widget = gtk_widget_get_accessible (widget); /* Create the label -> widget relation */ atk_object_add_relationship (atk_label, ATK_RELATION_LABEL_FOR, atk_widget); /* Create the widget -> label relation */ atk_object_add_relationship (atk_widget, ATK_RELATION_LABELLED_BY, atk_label); } /* * Hacks to make re-using gail somewhat easier. */ /** * eel_accessibility_create_derived_type: * @type_name: the name for the new accessible type eg. CajaIconCanvasItemAccessible * @existing_gobject_with_proxy: the GType of an object that has a registered factory that * manufactures the type we want to inherit from. ie. to inherit from a GailCanvasItem * we need to pass MATE_TYPE_CANVAS_ITEM - since GailCanvasItem is registered against * that type. * @opt_gail_parent_class: the name of the Gail class to derive from eg. GailCanvasItem * @class_init: the init function to run for this class * * This should be run to register the type, it can subsequently be run with * the same name and will not re-register it, but simply return it. * * NB. to do instance init, you prolly want to override AtkObject::initialize * * Return value: the registered type, or 0 on failure. **/ GType eel_accessibility_create_derived_type (const char *type_name, GType existing_gobject_with_proxy, EelAccessibilityClassInitFn class_init) { GType type; GType parent_atk_type; GTypeInfo tinfo = { 0 }; GTypeQuery query; AtkObjectFactory *factory; if ((type = g_type_from_name (type_name))) { return type; } factory = atk_registry_get_factory (atk_get_default_registry (), existing_gobject_with_proxy); if (!factory) { return G_TYPE_INVALID; } parent_atk_type = atk_object_factory_get_accessible_type (factory); if (!parent_atk_type) { return G_TYPE_INVALID; } /* * Figure out the size of the class and instance * we are deriving from */ g_type_query (parent_atk_type, &query); if (class_init) { tinfo.class_init = (GClassInitFunc) class_init; } tinfo.class_size = query.class_size; tinfo.instance_size = query.instance_size; /* Register the type */ type = g_type_register_static ( parent_atk_type, type_name, &tinfo, 0); return type; } static GQuark get_quark_accessible (void) { static GQuark quark_accessible_object = 0; if (!quark_accessible_object) { quark_accessible_object = g_quark_from_static_string ("accessible-object"); } return quark_accessible_object; } static GQuark get_quark_gobject (void) { static GQuark quark_accessible_gobject = 0; if (!quark_accessible_gobject) { quark_accessible_gobject = g_quark_from_static_string ("object-for-accessible"); } return quark_accessible_gobject; } /** * eel_accessibility_get_atk_object: * @object: a GObject of some sort * * gets an AtkObject associated with a GObject * * Return value: the associated accessible if one exists or NULL **/ AtkObject * eel_accessibility_get_atk_object (gpointer object) { return g_object_get_qdata (object, get_quark_accessible ()); } /** * eel_accessibilty_for_object: * @object: a GObject of some sort * * gets an AtkObject associated with a GObject and if it doesn't * exist creates a suitable accessible object. * * Return value: an associated accessible. **/ AtkObject * eel_accessibility_for_object (gpointer object) { if (GTK_IS_WIDGET (object)) return gtk_widget_get_accessible (object); return atk_gobject_accessible_for_object (object); } /** * eel_accessibility_get_gobject: * @object: an AtkObject * * gets the GObject associated with the AtkObject, for which * @object provides accessibility support. * * Return value: the accessible's associated GObject **/ gpointer eel_accessibility_get_gobject (AtkObject *object) { return g_object_get_qdata (G_OBJECT (object), get_quark_gobject ()); } static void eel_accessibility_destroy (gpointer data, GObject *where_the_object_was) { atk_object_notify_state_change (ATK_OBJECT (data), ATK_STATE_DEFUNCT, TRUE); } /** * eel_accessibility_set_atk_object_return: * @object: a GObject * @atk_object: it's AtkObject * * used to register and return a new accessible object for something * * Return value: @atk_object. **/ AtkObject * eel_accessibility_set_atk_object_return (gpointer object, AtkObject *atk_object) { atk_object_initialize (atk_object, object); if (!ATK_IS_GOBJECT_ACCESSIBLE (atk_object)) { g_object_set_qdata_full (object, get_quark_accessible (), atk_object, (GDestroyNotify)eel_accessibility_destroy); g_object_set_qdata (G_OBJECT (atk_object), get_quark_gobject (), object); } return atk_object; } static GailTextUtil * get_simple_text (gpointer object) { GObject *gobject; EelAccessibleTextIface *aif; if (GTK_IS_ACCESSIBLE (object)) { gobject = G_OBJECT (gtk_accessible_get_widget (GTK_ACCESSIBLE (object))); } else { gobject = eel_accessibility_get_gobject (object); } if (!gobject) { return NULL; } aif = EEL_ACCESSIBLE_TEXT_GET_IFACE (gobject); if (!aif) { g_warning ("No accessible text inferface on '%s'", g_type_name_from_instance ((gpointer) gobject)); } else if (aif->get_text) { return aif->get_text (gobject); } return NULL; } char * eel_accessibility_text_get_text (AtkText *text, gint start_pos, gint end_pos) { GailTextUtil *util = get_simple_text (text); g_return_val_if_fail (util != NULL, NULL); return gail_text_util_get_substring (util, start_pos, end_pos); } gunichar eel_accessibility_text_get_character_at_offset (AtkText *text, gint offset) { char *txt, *index; gint sucks1 = 0, sucks2 = -1; gunichar c; GailTextUtil *util = get_simple_text (text); g_return_val_if_fail (util != NULL, 0); txt = gail_text_util_get_substring (util, sucks1, sucks2); index = g_utf8_offset_to_pointer (txt, offset); c = g_utf8_get_char (index); g_free (txt); return c; } char * eel_accessibility_text_get_text_before_offset (AtkText *text, gint offset, AtkTextBoundary boundary_type, gint *start_offset, gint *end_offset) { GailTextUtil *util = get_simple_text (text); g_return_val_if_fail (util != NULL, NULL); return gail_text_util_get_text ( util, NULL, GAIL_BEFORE_OFFSET, boundary_type, offset, start_offset, end_offset); } char * eel_accessibility_text_get_text_at_offset (AtkText *text, gint offset, AtkTextBoundary boundary_type, gint *start_offset, gint *end_offset) { GailTextUtil *util = get_simple_text (text); g_return_val_if_fail (util != NULL, NULL); return gail_text_util_get_text ( util, NULL, GAIL_AT_OFFSET, boundary_type, offset, start_offset, end_offset); } gchar* eel_accessibility_text_get_text_after_offset (AtkText *text, gint offset, AtkTextBoundary boundary_type, gint *start_offset, gint *end_offset) { GailTextUtil *util = get_simple_text (text); g_return_val_if_fail (util != NULL, NULL); return gail_text_util_get_text ( util, NULL, GAIL_AFTER_OFFSET, boundary_type, offset, start_offset, end_offset); } gint eel_accessibility_text_get_character_count (AtkText *text) { GailTextUtil *util = get_simple_text (text); g_return_val_if_fail (util != NULL, -1); return gtk_text_buffer_get_char_count (util->buffer); } static void eel_accessibility_simple_text_interface_init (AtkTextIface *iface) { iface->get_text = eel_accessibility_text_get_text; iface->get_character_at_offset = eel_accessibility_text_get_character_at_offset; iface->get_text_before_offset = eel_accessibility_text_get_text_before_offset; iface->get_text_at_offset = eel_accessibility_text_get_text_at_offset; iface->get_text_after_offset = eel_accessibility_text_get_text_after_offset; iface->get_character_count = eel_accessibility_text_get_character_count; /* iface->get_caret_offset = eel_accessibility_text_get_caret_offset; iface->set_caret_offset = eel_accessibility_text_set_caret_offset; iface->get_selection = eel_accessibility_text_get_selection; iface->get_n_selections = eel_accessibility_text_get_n_selections; iface->add_selection = eel_accessibility_text_add_selection; iface->remove_selection = eel_accessibility_text_remove_selection; iface->set_selection = eel_accessibility_text_set_selection; iface->get_run_attributes = eel_accessibility_text_get_run_attributes; iface->get_default_attributes = eel_accessibility_text_get_default_attributes; iface->get_character_extents = eel_accessibility_text_get_character_extents; iface->get_offset_at_point = eel_accessibility_text_get_offset_at_point; */ } void eel_accessibility_add_simple_text (GType type) { const GInterfaceInfo simple_text_info = { (GInterfaceInitFunc) eel_accessibility_simple_text_interface_init, (GInterfaceFinalizeFunc) NULL, NULL }; g_return_if_fail (type != G_TYPE_INVALID); g_type_add_interface_static ( type, ATK_TYPE_TEXT, &simple_text_info); } GType eel_accessible_text_get_type (void) { static GType type = 0; if (!type) { const GTypeInfo tinfo = { sizeof (AtkTextIface), (GBaseInitFunc) NULL, (GBaseFinalizeFunc) NULL, (GClassInitFunc) NULL, (GClassFinalizeFunc) NULL }; type = g_type_register_static ( G_TYPE_INTERFACE, "EelAccessibleText", &tinfo, 0); } return type; } void eel_accessibility_set_name (gpointer object, const char *name) { AtkObject *atk_object = eel_accessibility_for_object (object); if (atk_object) { atk_object_set_name (atk_object, name); } } void eel_accessibility_set_description (gpointer object, const char *description) { AtkObject *atk_object = eel_accessibility_for_object (object); if (atk_object) { atk_object_set_description (atk_object, description); } }