1 /* ATK - Accessibility Toolkit
2 * Copyright 2001 Sun Microsystems Inc.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
20 #ifndef __ATK_UTIL_H__
21 #define __ATK_UTIL_H__
23 #include <atk/atkobject.h>
27 #endif /* __cplusplus */
29 #define ATK_TYPE_UTIL (atk_util_get_type ())
30 #define ATK_IS_UTIL(obj) G_TYPE_CHECK_INSTANCE_TYPE ((obj), ATK_TYPE_UTIL)
31 #define ATK_UTIL(obj) G_TYPE_CHECK_INSTANCE_CAST ((obj), ATK_TYPE_UTIL, AtkUtil)
32 #define ATK_UTIL_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), ATK_TYPE_UTIL, AtkUtilClass))
33 #define ATK_IS_UTIL_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), ATK_TYPE_UTIL))
34 #define ATK_UTIL_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), ATK_TYPE_UTIL, AtkUtilClass))
37 #ifndef _TYPEDEF_ATK_UTIL_
38 #define _TYPEDEF_ATK_UTIL_
39 typedef struct _AtkUtil AtkUtil;
40 typedef struct _AtkUtilClass AtkUtilClass;
41 typedef struct _AtkKeyEventStruct AtkKeyEventStruct;
46 * @obj: An #AtkObject instance for whom the callback will be called when
47 * the specified event (e.g. 'focus:') takes place.
49 * A function which is called when an object emits a matching event,
50 * as used in #atk_add_focus_tracker.
51 * Currently the only events for which object-specific handlers are
52 * supported are events of type "focus:". Most clients of ATK will prefer to
53 * attach signal handlers for the various ATK signals instead.
55 * @see: atk_add_focus_tracker.
57 typedef void (*AtkEventListener) (AtkObject* obj);
59 * AtkEventListenerInit:
61 * An #AtkEventListenerInit function is a special function that is
62 * called in order to initialize the per-object event registration system
63 * used by #AtkEventListener, if any preparation is required.
65 * @see: atk_focus_tracker_init.
67 typedef void (*AtkEventListenerInit) (void);
70 * @event: an AtkKeyEventStruct containing information about the key event for which
71 * notification is being given.
72 * @func_data: a block of data which will be passed to the event listener, on notification.
74 * An #AtkKeySnoopFunc is a type of callback which is called whenever a key event occurs,
75 * if registered via atk_add_key_event_listener. It allows for pre-emptive
76 * interception of key events via the return code as described below.
78 * Returns: TRUE (nonzero) if the event emission should be stopped and the event
79 * discarded without being passed to the normal GUI recipient; FALSE (zero) if the
80 * event dispatch to the client application should proceed as normal.
82 * @see: atk_add_key_event_listener.
84 typedef gint (*AtkKeySnoopFunc) (AtkKeyEventStruct *event,
87 struct _AtkKeyEventStruct {
99 *@ATK_KEY_EVENT_PRESS: specifies a key press event
100 *@ATK_KEY_EVENT_RELEASE: specifies a key release event
101 *@ATK_KEY_EVENT_LAST_DEFINED: Not a valid value; specifies end of enumeration
103 *Specifies the type of a keyboard evemt.
108 ATK_KEY_EVENT_RELEASE,
109 ATK_KEY_EVENT_LAST_DEFINED
120 guint (* add_global_event_listener) (GSignalEmissionHook listener,
121 const gchar *event_type);
122 void (* remove_global_event_listener) (guint listener_id);
123 guint (* add_key_event_listener) (AtkKeySnoopFunc listener,
125 void (* remove_key_event_listener) (guint listener_id);
126 AtkObject* (* get_root) (void);
127 G_CONST_RETURN gchar* (* get_toolkit_name) (void);
128 G_CONST_RETURN gchar* (* get_toolkit_version) (void);
130 GType atk_util_get_type (void);
134 *@ATK_XY_SCREEN: specifies xy coordinates relative to the screen
135 *@ATK_XY_WINDOW: specifies xy coordinates relative to the widget's
138 *Specifies how xy coordinates are to be interpreted. Used by functions such
139 *as atk_component_get_position() and atk_text_get_character_extents()
147 * Adds the specified function to the list of functions to be called
148 * when an object receives focus.
150 guint atk_add_focus_tracker (AtkEventListener focus_tracker);
153 * Removes the specified focus tracker from the list of function
154 * to be called when any object receives focus
156 void atk_remove_focus_tracker (guint tracker_id);
159 * atk_focus_tracker_init:
160 * @init: An #AtkEventListenerInit function to be called
161 * prior to any focus-tracking requests.
163 * Specifies the function to be called for focus tracker initialization.
164 * removal. This function should be called by an implementation of the
165 * ATK interface if any specific work needs to be done to enable
168 void atk_focus_tracker_init (AtkEventListenerInit init);
171 * Cause the focus tracker functions which have been specified to be
172 * executed for the object.
174 void atk_focus_tracker_notify (AtkObject *object);
177 * Adds the specified function to the list of functions to be called
178 * when an event of type event_type occurs.
180 guint atk_add_global_event_listener (GSignalEmissionHook listener,
181 const gchar *event_type);
184 * Removes the specified event listener
186 void atk_remove_global_event_listener (guint listener_id);
189 * Adds the specified function to the list of functions to be called
190 * when an keyboard event occurs.
192 guint atk_add_key_event_listener (AtkKeySnoopFunc listener, gpointer data);
195 * Removes the specified event listener
197 void atk_remove_key_event_listener (guint listener_id);
200 * Returns the root accessible container for the current application.
202 AtkObject* atk_get_root(void);
204 AtkObject* atk_get_focus_object (void);
207 * Returns name string for the GUI toolkit.
209 G_CONST_RETURN gchar *atk_get_toolkit_name (void);
212 * Returns version string for the GUI toolkit.
214 G_CONST_RETURN gchar *atk_get_toolkit_version (void);
218 #endif /* __cplusplus */
221 #endif /* __ATK_UTIL_H__ */