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_OBJECT_H__
21 #define __ATK_OBJECT_H__
25 #endif /* __cplusplus */
27 #include <glib-object.h>
30 * AtkObject represents the minimum information all accessible objects
31 * return. This information includes accessible name, accessible
32 * description, role and state of the object, as well information about
33 * its parent and children. It is also possible to obtain more specific
34 * accessibility information about a component if it supports one or more
35 * of the following interfaces:
40 *@ATK_ROLE_INVALID: Invalid role
41 *@ATK_ROLE_ACCEL_LABEL: A label which represents an accelerator
42 *@ATK_ROLE_ALERT: An object which is an alert to the user
43 *@ATK_ROLE_ANIMATION: An object which is an animated image
44 *@ATK_ROLE_ARROW: An arrow in one of the four cardinal directions
45 *@ATK_ROLE_CALENDAR: An object that displays a calendar and allows the user to select a date
46 *@ATK_ROLE_CANVAS: An object that can be drawn into and is used to trap events
47 *@ATK_ROLE_CHECK_BOX: A choice that can be checked or unchecked and provides a separate indicator for the current state
48 *@ATK_ROLE_CHECK_MENU_ITEM: A menu item with a check box
49 *@ATK_ROLE_COLOR_CHOOSER: A specialized dialog that lets the user choose a color
50 *@ATK_ROLE_COLUMN_HEADER: The header for a column of data
51 *@ATK_ROLE_COMBO_BOX: A list of choices the user can select from
52 *@ATK_ROLE_DATE_EDITOR: An object whose purpose is to allow a user to edit a date
53 *@ATK_ROLE_DESKTOP_ICON: An inconifed internal frame within a DESKTOP_PANE
54 *@ATK_ROLE_DESKTOP_FRAME: A pane that supports internal frames and iconified versions of those internal frames
55 *@ATK_ROLE_DIAL: An object whose purpose is to allow a user to set a value
56 *@ATK_ROLE_DIALOG: A top level window with title bar and a border
57 *@ATK_ROLE_DIRECTORY_PANE: A pane that allows the user to navigate through and select the contents of a directory
58 *@ATK_ROLE_DRAWING_AREA: An object used for drawing custom user interface elements
59 *@ATK_ROLE_FILE_CHOOSER: A specialized dialog that lets the user choose a file
60 *@ATK_ROLE_FILLER: A object that fills up space in a user interface
61 *@ATK_ROLE_FONT_CHOOSER: A specialized dialog that lets the user choose a font
62 *@ATK_ROLE_FRAME: A top level window with a title bar, border, menubar, etc.
63 *@ATK_ROLE_GLASS_PANE: A pane that is guaranteed to be painted on top of all panes beneath it
64 *@ATK_ROLE_HTML_CONTAINER: A document container for HTML, whose children represent the document content
65 *@ATK_ROLE_ICON: A small fixed size picture, typically used to decorate components
66 *@ATK_ROLE_IMAGE: An object whose primary purpose is to display an image
67 *@ATK_ROLE_INTERNAL_FRAME: A frame-like object that is clipped by a desktop pane
68 *@ATK_ROLE_LABEL: An object used to present an icon or short string in an interface
69 *@ATK_ROLE_LAYERED_PANE: A specialized pane that allows its children to be drawn in layers, providing a form of stacking order
70 *@ATK_ROLE_LIST: An object that presents a list of objects to the user and allows the user to select one or more of them
71 *@ATK_ROLE_LIST_ITEM: An object that represents an element of a list
72 *@ATK_ROLE_MENU: An object usually found inside a menu bar that contains a list of actions the user can choose from
73 *@ATK_ROLE_MENU_BAR: An object usually drawn at the top of the primary dialog box of an application that contains a list of menus the user can choose from
74 *@ATK_ROLE_MENU_ITEM: An object usually contained in a menu that presents an action the user can choose
75 *@ATK_ROLE_OPTION_PANE: A specialized pane whose primary use is inside a DIALOG
76 *@ATK_ROLE_PAGE_TAB: An object that is a child of a page tab list
77 *@ATK_ROLE_PAGE_TAB_LIST: An object that presents a series of panels (or page tabs), one at a time, through some mechanism provided by the object
78 *@ATK_ROLE_PANEL: A generic container that is often used to group objects
79 *@ATK_ROLE_PASSWORD_TEXT: A text object uses for passwords, or other places where the text content is not shown visibly to the user
80 *@ATK_ROLE_POPUP_MENU: A temporary window that is usually used to offer the user a list of choices, and then hides when the user selects one of those choices
81 *@ATK_ROLE_PROGRESS_BAR: An object used to indicate how much of a task has been completed
82 *@ATK_ROLE_PUSH_BUTTON: An object the user can manipulate to tell the application to do something
83 *@ATK_ROLE_RADIO_BUTTON: A specialized check box that will cause other radio buttons in the same group to become uncghecked when this one is checked
84 *@ATK_ROLE_RADIO_MENU_ITEM: A check menu item which belongs to a group. At each instant exactly one of the radio menu items from a group is selected
85 *@ATK_ROLE_ROOT_PANE: A specialized pane that has a glass pane and a layered pane as its children
86 *@ATK_ROLE_ROW_HEADER: The header for a row of data
87 *@ATK_ROLE_SCROLL_BAR: An object usually used to allow a user to incrementally view a large amount of data.
88 *@ATK_ROLE_SCROLL_PANE: An object that allows a user to incrementally view a large amount of information
89 *@ATK_ROLE_SEPARATOR: An object usually contained in a menu to provide a visible and logical separation of the contents in a menu
90 *@ATK_ROLE_SLIDER: An object that allows the user to select from a bounded range
91 *@ATK_ROLE_SPLIT_PANE: A specialized panel that presents two other panels at the same time
92 *@ATK_ROLE_SPIN_BUTTON: An object used to get an integer or floating point number from the user
93 *@ATK_ROLE_STATUS_BAR: An object which reports messages of minor importance to the user
94 *@ATK_ROLE_TABLE: An object used to rpesent information in terms of rows and columns
95 *@ATK_ROLE_TABLE_CELL: A cell in a table
96 *@ATK_ROLE_TABLE_COLUMN_HEADER: The header for a column of a table
97 *@ATK_ROLE_TABLE_ROW_HEADER: The header for a row of a table
98 *@ATK_ROLE_TEAR_OFF_MENU_ITEM: A menu item used to tear off and reattach its menu
99 *@ATK_ROLE_TEXT: An object that presents text to the user
100 *@ATK_ROLE_TOGGLE_BUTTON: A specialized push button that can be checked or unchecked, but does not procide a separate indicator for the current state
101 *@ATK_ROLE_TOOL_BAR: A bar or palette usually composed of push buttons or toggle buttons
102 *@ATK_ROLE_TOOL_TIP: An object that provides information about another object
103 *@ATK_ROLE_TREE: An object used to repsent hierarchical information to the user
104 *@ATK_ROLE_UNKNOWN: The object contains some Accessible information, but its role is not known
105 *@ATK_ROLE_VIEWPORT: An object usually used in a scroll pane
106 *@ATK_ROLE_WINDOW: A top level window with no title or border
107 *@ATK_ROLE_LAST_DEFINED: not a valid role, used for finding end of enumeration
109 *Describes the role of an object
114 ATK_ROLE_ACCEL_LABEL,
121 ATK_ROLE_CHECK_MENU_ITEM,
122 ATK_ROLE_COLOR_CHOOSER,
123 ATK_ROLE_COLUMN_HEADER,
125 ATK_ROLE_DATE_EDITOR,
126 ATK_ROLE_DESKTOP_ICON,
127 ATK_ROLE_DESKTOP_FRAME,
130 ATK_ROLE_DIRECTORY_PANE,
131 ATK_ROLE_DRAWING_AREA,
132 ATK_ROLE_FILE_CHOOSER,
134 ATK_ROLE_FONT_CHOOSER,
137 ATK_ROLE_HTML_CONTAINER,
140 ATK_ROLE_INTERNAL_FRAME,
142 ATK_ROLE_LAYERED_PANE,
148 ATK_ROLE_OPTION_PANE,
150 ATK_ROLE_PAGE_TAB_LIST,
152 ATK_ROLE_PASSWORD_TEXT,
154 ATK_ROLE_PROGRESS_BAR,
155 ATK_ROLE_PUSH_BUTTON,
156 ATK_ROLE_RADIO_BUTTON,
157 ATK_ROLE_RADIO_MENU_ITEM,
161 ATK_ROLE_SCROLL_PANE,
165 ATK_ROLE_SPIN_BUTTON,
169 ATK_ROLE_TABLE_COLUMN_HEADER,
170 ATK_ROLE_TABLE_ROW_HEADER,
171 ATK_ROLE_TEAR_OFF_MENU_ITEM,
173 ATK_ROLE_TOGGLE_BUTTON,
180 ATK_ROLE_LAST_DEFINED
183 AtkRole atk_role_register (const gchar *name);
186 #define ATK_TYPE_OBJECT (atk_object_get_type ())
187 #define ATK_OBJECT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), ATK_TYPE_OBJECT, AtkObject))
188 #define ATK_OBJECT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), ATK_TYPE_OBJECT, AtkObjectClass))
189 #define ATK_IS_OBJECT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), ATK_TYPE_OBJECT))
190 #define ATK_IS_OBJECT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), ATK_TYPE_OBJECT))
191 #define ATK_OBJECT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), ATK_TYPE_OBJECT, AtkObjectClass))
193 #define ATK_TYPE_IMPLEMENTOR (atk_implementor_get_type ())
194 #define ATK_IS_IMPLEMENTOR(obj) G_TYPE_CHECK_INSTANCE_TYPE ((obj), ATK_TYPE_IMPLEMENTOR)
195 #define ATK_IMPLEMENTOR(obj) G_TYPE_CHECK_INSTANCE_CAST ((obj), ATK_TYPE_IMPLEMENTOR, AtkImplementor)
196 #define ATK_IMPLEMENTOR_GET_IFACE(obj) (G_TYPE_INSTANCE_GET_INTERFACE ((obj), ATK_TYPE_IMPLEMENTOR, AtkImplementorIface))
199 typedef struct _AtkImplementor AtkImplementor; /* dummy typedef */
200 typedef struct _AtkImplementorIface AtkImplementorIface;
203 typedef struct _AtkObject AtkObject;
204 typedef struct _AtkObjectClass AtkObjectClass;
205 typedef struct _AtkRelationSet AtkRelationSet;
206 typedef struct _AtkStateSet AtkStateSet;
208 struct _AtkPropertyValues
210 gchar *property_name;
215 typedef struct _AtkPropertyValues AtkPropertyValues;
218 * For most properties the old_value field of AtkPropertyValues will
219 * not contain a valid value.
221 * Currently, the only property for which old_value is used is
222 * accessible-state; for instance if there is a focus state the
223 * property change handler will be called for the object which lost the focus
224 * with the old_value containing an AtkState value corresponding to focused
225 * and the property change handler will be called for the object which
226 * received the focus with the new_value containing an AtkState value
227 * corresponding to focused.
229 typedef void (*AtkPropertyChangeHandler) (AtkObject*, AtkPropertyValues*);
238 AtkObject *accessible_parent;
240 AtkRelationSet *relation_set;
243 struct _AtkObjectClass
248 * Gets the accessible name of the object
250 G_CONST_RETURN gchar* (* get_name) (AtkObject *accessible);
252 * Gets the accessible description of the object
254 G_CONST_RETURN gchar* (* get_description) (AtkObject *accessible);
256 * Gets the accessible parent of the object
258 AtkObject* (*get_parent) (AtkObject *accessible);
261 * Gets the number of accessible children of the object
263 gint (* get_n_children) (AtkObject *accessible);
265 * Returns a reference to the specified accessible child of the object.
266 * The accessible children are 0-based so the first accessible child is
267 * at index 0, the second at index 1 and so on.
269 AtkObject* (* ref_child) (AtkObject *accessible,
272 * Gets the 0-based index of this object in its parent; returns -1 if the
273 * object does not have an accessible parent.
275 gint (* get_index_in_parent) (AtkObject *accessible);
277 * Gets the RelationSet associated with the object
279 AtkRelationSet* (* ref_relation_set) (AtkObject *accessible);
281 * Gets the role of the object
283 AtkRole (* get_role) (AtkObject *accessible);
285 * Gets the state set of the object
287 AtkStateSet* (* ref_state_set) (AtkObject *accessible);
289 * Sets the accessible name of the object
291 void (* set_name) (AtkObject *accessible,
294 * Sets the accessible description of the object
296 void (* set_description) (AtkObject *accessible,
297 const gchar *description);
299 * Sets the accessible parent of the object
301 void (* set_parent) (AtkObject *accessible,
304 * Sets the accessible role of the object
306 void (* set_role) (AtkObject *accessible,
309 * Specifies a function to be called when a property changes value
311 guint (* connect_property_change_handler) (AtkObject
313 AtkPropertyChangeHandler *handler);
315 * Removes a property change handler which was specified using
316 * connect_property_change_handler
318 void (* remove_property_change_handler) (AtkObject
323 * The signal handler which is executed when there is a change in the
324 * children of the object
326 void (* children_changed) (AtkObject *accessible,
328 AtkObject *changed_child);
330 * The signal handler which is executed when there is a focus event
333 void (*focus_event) (AtkObject *accessible,
337 GType atk_object_get_type (void);
339 struct _AtkImplementorIface
341 GTypeInterface parent;
343 AtkObject* (*ref_accessible) (AtkImplementor *implementor);
345 GType atk_implementor_get_type (void);
348 * This method uses the ref_accessible method in AtkImplementorIface,
349 * if the object's class implements AtkImplementorIface.
350 * Otherwise it returns %NULL.
353 * Note also that because this method may return flyweight objects,
354 * it increments the returned AtkObject's reference count.
355 * Therefore it is the responsibility of the calling
356 * program to unreference the object when no longer needed.
357 * (c.f. gtk_widget_get_accessible() where this is not the case).
359 AtkObject* atk_implementor_ref_accessible (AtkImplementor *implementor);
362 * Properties directly supported by AtkObject
365 G_CONST_RETURN gchar* atk_object_get_name (AtkObject *accessible);
366 G_CONST_RETURN gchar* atk_object_get_description (AtkObject *accessible);
367 AtkObject* atk_object_get_parent (AtkObject *accessible);
368 gint atk_object_get_n_accessible_children (AtkObject *accessible);
369 AtkObject* atk_object_ref_accessible_child (AtkObject *accessible,
371 AtkRelationSet* atk_object_ref_relation_set (AtkObject *accessible);
372 AtkRole atk_object_get_role (AtkObject *accessible);
373 AtkStateSet* atk_object_ref_state_set (AtkObject *accessible);
374 gint atk_object_get_index_in_parent (AtkObject *accessible);
375 void atk_object_set_name (AtkObject *accessible,
377 void atk_object_set_description (AtkObject *accessible,
378 const gchar *description);
379 void atk_object_set_parent (AtkObject *accessible,
381 void atk_object_set_role (AtkObject *accessible,
386 * to install property change listener, one must
387 * install signal handler for gobject "properties_changed" signal.
388 * (for single notifications of multiple changes).
389 * We could use the "notify" signal instead.
392 guint atk_object_connect_property_change_handler (AtkObject *accessible,
393 AtkPropertyChangeHandler *handler);
394 void atk_object_remove_property_change_handler (AtkObject *accessible,
398 * Note: the properties which are registered with the GType
399 * property registry, for type ATK_TYPE_OBJECT, are as follows:
402 * "accessible-description"
403 * "accessible-parent"
408 * accessibility property change listeners should use the
409 * normal GObject property interfaces and "properties_changed"
410 * signal handler semantics to interpret the property change
411 * information relayed from AtkObject.
412 * (AtkObject instances will connect to the "properties_changed"
413 * signal in their host objects, and relay the signals when appropriate).
416 /* For other signals, see related interfaces
427 * The usage model for obtaining these interface instances is:
428 * ATK_<interfacename>_GET_IFACE(GObject *accessible),
429 * where accessible, though specified as a GObject, is
430 * the AtkObject instance being queried.
431 * More usually, the interface will be used via a cast to the
432 * interface's corresponding "type":
434 * AtkText textImpl = ATK_TEXT(accessible);
437 * cpos = atk_text_get_caret_position(textImpl);
440 * If it's known in advance that accessible implements AtkTextIface,
441 * this is shortened to:
443 * cpos = atk_text_get_caret_position (ATK_TEXT (accessible));
448 #endif /* __cplusplus */
451 #endif /* __ATK_OBJECT_H__ */