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243 lines
8.3 KiB
C
243 lines
8.3 KiB
C
/* ATK - Accessibility Toolkit
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* Copyright 2001 Sun Microsystems Inc.
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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 Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __ATK_UTIL_H__
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#define __ATK_UTIL_H__
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#include <atk/atkobject.h>
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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#define ATK_TYPE_UTIL (atk_util_get_type ())
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#define ATK_IS_UTIL(obj) G_TYPE_CHECK_INSTANCE_TYPE ((obj), ATK_TYPE_UTIL)
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#define ATK_UTIL(obj) G_TYPE_CHECK_INSTANCE_CAST ((obj), ATK_TYPE_UTIL, AtkUtil)
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#define ATK_UTIL_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), ATK_TYPE_UTIL, AtkUtilClass))
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#define ATK_IS_UTIL_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), ATK_TYPE_UTIL))
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#define ATK_UTIL_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), ATK_TYPE_UTIL, AtkUtilClass))
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#ifndef _TYPEDEF_ATK_UTIL_
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#define _TYPEDEF_ATK_UTIL_
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typedef struct _AtkUtil AtkUtil;
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typedef struct _AtkUtilClass AtkUtilClass;
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typedef struct _AtkKeyEventStruct AtkKeyEventStruct;
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#endif
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/**
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* AtkEventListener:
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* @obj: An #AtkObject instance for whom the callback will be called when
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* the specified event (e.g. 'focus:') takes place.
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*
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* A function which is called when an object emits a matching event,
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* as used in #atk_add_focus_tracker.
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* Currently the only events for which object-specific handlers are
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* supported are events of type "focus:". Most clients of ATK will prefer to
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* attach signal handlers for the various ATK signals instead.
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*
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* @see: atk_add_focus_tracker.
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**/
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typedef void (*AtkEventListener) (AtkObject* obj);
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/**
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* AtkEventListenerInit:
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*
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* An #AtkEventListenerInit function is a special function that is
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* called in order to initialize the per-object event registration system
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* used by #AtkEventListener, if any preparation is required.
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*
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* @see: atk_focus_tracker_init.
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**/
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typedef void (*AtkEventListenerInit) (void);
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/**
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* AtkKeySnoopFunc:
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* @event: an AtkKeyEventStruct containing information about the key event for which
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* notification is being given.
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* @func_data: a block of data which will be passed to the event listener, on notification.
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*
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* An #AtkKeySnoopFunc is a type of callback which is called whenever a key event occurs,
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* if registered via atk_add_key_event_listener. It allows for pre-emptive
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* interception of key events via the return code as described below.
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*
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* Returns: TRUE (nonzero) if the event emission should be stopped and the event
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* discarded without being passed to the normal GUI recipient; FALSE (zero) if the
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* event dispatch to the client application should proceed as normal.
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*
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* @see: atk_add_key_event_listener.
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**/
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typedef gint (*AtkKeySnoopFunc) (AtkKeyEventStruct *event,
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gpointer func_data);
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/**
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* AtkKeyEventStruct:
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* @type: An AtkKeyEventType, generally one of ATK_KEY_EVENT_PRESS or ATK_KEY_EVENT_RELEASE
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* @state: A bitmask representing the state of the modifier keys immediately after the event takes place.
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* The meaning of the bits is currently defined to match the bitmask used by GDK in
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* GdkEventType.state, see
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* http://developer.gnome.org/doc/API/2.0/gdk/gdk-Event-Structures.html#GdkEventKey
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* @keyval: A guint representing a keysym value corresponding to those used by GDK and X11: see
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* /usr/X11/include/keysymdef.h.
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* @length: The length of member #string.
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* @string: A string containing one of the following: either a string approximating the text that would
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* result from this keypress, if the key is a control or graphic character, or a symbolic name for this keypress.
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* Alphanumeric and printable keys will have the symbolic key name in this string member, for instance "A". "0",
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* "semicolon", "aacute". Keypad keys have the prefix "KP".
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* @keycode: The raw hardware code that generated the key event. This field is raraly useful.
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* @timestamp: A timestamp in milliseconds indicating when the event occurred.
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* These timestamps are relative to a starting point which should be considered arbitrary,
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* and only used to compare the dispatch times of events to one another.
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*
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* Encapsulates information about a key event.
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**/
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struct _AtkKeyEventStruct {
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gint type;
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guint state;
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guint keyval;
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gint length;
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gchar *string;
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guint16 keycode;
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guint32 timestamp;
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};
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/**
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*AtkKeyEventType:
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*@ATK_KEY_EVENT_PRESS: specifies a key press event
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*@ATK_KEY_EVENT_RELEASE: specifies a key release event
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*@ATK_KEY_EVENT_LAST_DEFINED: Not a valid value; specifies end of enumeration
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*
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*Specifies the type of a keyboard evemt.
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**/
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typedef enum
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{
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ATK_KEY_EVENT_PRESS,
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ATK_KEY_EVENT_RELEASE,
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ATK_KEY_EVENT_LAST_DEFINED
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} AtkKeyEventType;
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struct _AtkUtil
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{
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GObject parent;
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};
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struct _AtkUtilClass
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{
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GObjectClass parent;
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guint (* add_global_event_listener) (GSignalEmissionHook listener,
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const gchar *event_type);
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void (* remove_global_event_listener) (guint listener_id);
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guint (* add_key_event_listener) (AtkKeySnoopFunc listener,
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gpointer data);
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void (* remove_key_event_listener) (guint listener_id);
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AtkObject* (* get_root) (void);
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G_CONST_RETURN gchar* (* get_toolkit_name) (void);
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G_CONST_RETURN gchar* (* get_toolkit_version) (void);
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};
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GType atk_util_get_type (void);
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/**
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*AtkCoordType:
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*@ATK_XY_SCREEN: specifies xy coordinates relative to the screen
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*@ATK_XY_WINDOW: specifies xy coordinates relative to the widget's
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* top-level window
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*
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*Specifies how xy coordinates are to be interpreted. Used by functions such
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*as atk_component_get_position() and atk_text_get_character_extents()
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**/
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typedef enum {
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ATK_XY_SCREEN,
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ATK_XY_WINDOW
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}AtkCoordType;
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/*
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* Adds the specified function to the list of functions to be called
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* when an object receives focus.
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*/
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guint atk_add_focus_tracker (AtkEventListener focus_tracker);
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/*
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* Removes the specified focus tracker from the list of function
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* to be called when any object receives focus
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*/
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void atk_remove_focus_tracker (guint tracker_id);
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/*
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* atk_focus_tracker_init:
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* @init: An #AtkEventListenerInit function to be called
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* prior to any focus-tracking requests.
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*
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* Specifies the function to be called for focus tracker initialization.
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* removal. This function should be called by an implementation of the
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* ATK interface if any specific work needs to be done to enable
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* focus tracking.
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*/
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void atk_focus_tracker_init (AtkEventListenerInit init);
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/*
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* Cause the focus tracker functions which have been specified to be
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* executed for the object.
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*/
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void atk_focus_tracker_notify (AtkObject *object);
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/*
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* Adds the specified function to the list of functions to be called
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* when an event of type event_type occurs.
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*/
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guint atk_add_global_event_listener (GSignalEmissionHook listener,
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const gchar *event_type);
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/*
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* Removes the specified event listener
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*/
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void atk_remove_global_event_listener (guint listener_id);
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/*
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* Adds the specified function to the list of functions to be called
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* when an keyboard event occurs.
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*/
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guint atk_add_key_event_listener (AtkKeySnoopFunc listener, gpointer data);
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/*
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* Removes the specified event listener
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*/
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void atk_remove_key_event_listener (guint listener_id);
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/*
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* Returns the root accessible container for the current application.
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*/
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AtkObject* atk_get_root(void);
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AtkObject* atk_get_focus_object (void);
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/*
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* Returns name string for the GUI toolkit.
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*/
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G_CONST_RETURN gchar *atk_get_toolkit_name (void);
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/*
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* Returns version string for the GUI toolkit.
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*/
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G_CONST_RETURN gchar *atk_get_toolkit_version (void);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __ATK_UTIL_H__ */
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