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/* ATK - Accessibility Toolkit
* Copyright 2001 Sun Microsystems Inc.
*
* This 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.
*
* This 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 this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __ATK_UTIL_H__
#define __ATK_UTIL_H__
#include <atk/atkobject.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
#define ATK_TYPE_UTIL (atk_util_get_type ())
#define ATK_IS_UTIL(obj) G_TYPE_CHECK_INSTANCE_TYPE ((obj), ATK_TYPE_UTIL)
#define ATK_UTIL(obj) G_TYPE_CHECK_INSTANCE_CAST ((obj), ATK_TYPE_UTIL, AtkUtil)
#define ATK_UTIL_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), ATK_TYPE_UTIL, AtkUtilClass))
#define ATK_IS_UTIL_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), ATK_TYPE_UTIL))
#define ATK_UTIL_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), ATK_TYPE_UTIL, AtkUtilClass))
#ifndef _TYPEDEF_ATK_UTIL_
#define _TYPEDEF_ATK_UTIL_
typedef struct _AtkUtil AtkUtil;
typedef struct _AtkUtilClass AtkUtilClass;
typedef struct _AtkKeyEventStruct AtkKeyEventStruct;
#endif
/**
* AtkEventListener:
* @obj: An #AtkObject instance for whom the callback will be called when
* the specified event (e.g. 'focus:') takes place.
*
* A function which is called when an object emits a matching event,
* as used in #atk_add_focus_tracker.
* Currently the only events for which object-specific handlers are
* supported are events of type "focus:". Most clients of ATK will prefer to
* attach signal handlers for the various ATK signals instead.
*
* @see: atk_add_focus_tracker.
**/
typedef void (*AtkEventListener) (AtkObject* obj);
/**
* AtkEventListenerInit:
*
* An #AtkEventListenerInit function is a special function that is
* called in order to initialize the per-object event registration system
* used by #AtkEventListener, if any preparation is required.
*
* @see: atk_focus_tracker_init.
**/
typedef void (*AtkEventListenerInit) (void);
/**
* AtkKeySnoopFunc:
* @event: an AtkKeyEventStruct containing information about the key event for which
* notification is being given.
* @func_data: a block of data which will be passed to the event listener, on notification.
*
* An #AtkKeySnoopFunc is a type of callback which is called whenever a key event occurs,
* if registered via atk_add_key_event_listener. It allows for pre-emptive
* interception of key events via the return code as described below.
*
* Returns: TRUE (nonzero) if the event emission should be stopped and the event
* discarded without being passed to the normal GUI recipient; FALSE (zero) if the
* event dispatch to the client application should proceed as normal.
*
* @see: atk_add_key_event_listener.
**/
typedef gint (*AtkKeySnoopFunc) (AtkKeyEventStruct *event,
gpointer func_data);
/**
* AtkKeyEventStruct:
* @type: An AtkKeyEventType, generally one of ATK_KEY_EVENT_PRESS or ATK_KEY_EVENT_RELEASE
* @state: A bitmask representing the state of the modifier keys immediately after the event takes place.
* The meaning of the bits is currently defined to match the bitmask used by GDK in
* GdkEventType.state, see
* http://developer.gnome.org/doc/API/2.0/gdk/gdk-Event-Structures.html#GdkEventKey
* @keyval: A guint representing a keysym value corresponding to those used by GDK and X11: see
* /usr/X11/include/keysymdef.h.
* @length: The length of member #string.
* @string: A string containing one of the following: either a string approximating the text that would
* result from this keypress, if the key is a control or graphic character, or a symbolic name for this keypress.
* Alphanumeric and printable keys will have the symbolic key name in this string member, for instance "A". "0",
* "semicolon", "aacute". Keypad keys have the prefix "KP".
* @keycode: The raw hardware code that generated the key event. This field is raraly useful.
* @timestamp: A timestamp in milliseconds indicating when the event occurred.
* These timestamps are relative to a starting point which should be considered arbitrary,
* and only used to compare the dispatch times of events to one another.
*
* Encapsulates information about a key event.
**/
struct _AtkKeyEventStruct {
gint type;
guint state;
guint keyval;
gint length;
gchar *string;
guint16 keycode;
guint32 timestamp;
};
/**
*AtkKeyEventType:
*@ATK_KEY_EVENT_PRESS: specifies a key press event
*@ATK_KEY_EVENT_RELEASE: specifies a key release event
*@ATK_KEY_EVENT_LAST_DEFINED: Not a valid value; specifies end of enumeration
*
*Specifies the type of a keyboard evemt.
**/
typedef enum
{
ATK_KEY_EVENT_PRESS,
ATK_KEY_EVENT_RELEASE,
ATK_KEY_EVENT_LAST_DEFINED
} AtkKeyEventType;
struct _AtkUtil
{
GObject parent;
};
struct _AtkUtilClass
{
GObjectClass parent;
guint (* add_global_event_listener) (GSignalEmissionHook listener,
const gchar *event_type);
void (* remove_global_event_listener) (guint listener_id);
guint (* add_key_event_listener) (AtkKeySnoopFunc listener,
gpointer data);
void (* remove_key_event_listener) (guint listener_id);
AtkObject* (* get_root) (void);
G_CONST_RETURN gchar* (* get_toolkit_name) (void);
G_CONST_RETURN gchar* (* get_toolkit_version) (void);
};
GType atk_util_get_type (void);
/**
*AtkCoordType:
*@ATK_XY_SCREEN: specifies xy coordinates relative to the screen
*@ATK_XY_WINDOW: specifies xy coordinates relative to the widget's
* top-level window
*
*Specifies how xy coordinates are to be interpreted. Used by functions such
*as atk_component_get_position() and atk_text_get_character_extents()
**/
typedef enum {
ATK_XY_SCREEN,
ATK_XY_WINDOW
}AtkCoordType;
/*
* Adds the specified function to the list of functions to be called
* when an object receives focus.
*/
guint atk_add_focus_tracker (AtkEventListener focus_tracker);
/*
* Removes the specified focus tracker from the list of function
* to be called when any object receives focus
*/
void atk_remove_focus_tracker (guint tracker_id);
/*
* atk_focus_tracker_init:
* @init: An #AtkEventListenerInit function to be called
* prior to any focus-tracking requests.
*
* Specifies the function to be called for focus tracker initialization.
* removal. This function should be called by an implementation of the
* ATK interface if any specific work needs to be done to enable
* focus tracking.
*/
void atk_focus_tracker_init (AtkEventListenerInit init);
/*
* Cause the focus tracker functions which have been specified to be
* executed for the object.
*/
void atk_focus_tracker_notify (AtkObject *object);
/*
* Adds the specified function to the list of functions to be called
* when an event of type event_type occurs.
*/
guint atk_add_global_event_listener (GSignalEmissionHook listener,
const gchar *event_type);
/*
* Removes the specified event listener
*/
void atk_remove_global_event_listener (guint listener_id);
/*
* Adds the specified function to the list of functions to be called
* when an keyboard event occurs.
*/
guint atk_add_key_event_listener (AtkKeySnoopFunc listener, gpointer data);
/*
* Removes the specified event listener
*/
void atk_remove_key_event_listener (guint listener_id);
/*
* Returns the root accessible container for the current application.
*/
AtkObject* atk_get_root(void);
AtkObject* atk_get_focus_object (void);
/*
* Returns name string for the GUI toolkit.
*/
G_CONST_RETURN gchar *atk_get_toolkit_name (void);
/*
* Returns version string for the GUI toolkit.
*/
G_CONST_RETURN gchar *atk_get_toolkit_version (void);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* __ATK_UTIL_H__ */
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