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>
28 #include <atk/atkstate.h>
29 #include <atk/atkrelationtype.h>
32 * AtkObject represents the minimum information all accessible objects
33 * return. This information includes accessible name, accessible
34 * description, role and state of the object, as well information about
35 * its parent and children. It is also possible to obtain more specific
36 * accessibility information about a component if it supports one or more
37 * of the following interfaces:
43 *@ATK_ROLE_INVALID: Invalid role
44 *@ATK_ROLE_ACCEL_LABEL: A label which represents an accelerator
45 *@ATK_ROLE_ALERT: An object which is an alert to the user
46 *@ATK_ROLE_ANIMATION: An object which is an animated image
47 *@ATK_ROLE_ARROW: An arrow in one of the four cardinal directions
48 *@ATK_ROLE_CALENDAR: An object that displays a calendar and allows the user to select a date
49 *@ATK_ROLE_CANVAS: An object that can be drawn into and is used to trap events
50 *@ATK_ROLE_CHECK_BOX: A choice that can be checked or unchecked and provides a separate indicator for the current state
51 *@ATK_ROLE_CHECK_MENU_ITEM: A menu item with a check box
52 *@ATK_ROLE_COLOR_CHOOSER: A specialized dialog that lets the user choose a color
53 *@ATK_ROLE_COLUMN_HEADER: The header for a column of data
54 *@ATK_ROLE_COMBO_BOX: A list of choices the user can select from
55 *@ATK_ROLE_DATE_EDITOR: An object whose purpose is to allow a user to edit a date
56 *@ATK_ROLE_DESKTOP_ICON: An inconifed internal frame within a DESKTOP_PANE
57 *@ATK_ROLE_DESKTOP_FRAME: A pane that supports internal frames and iconified versions of those internal frames
58 *@ATK_ROLE_DIAL: An object whose purpose is to allow a user to set a value
59 *@ATK_ROLE_DIALOG: A top level window with title bar and a border
60 *@ATK_ROLE_DIRECTORY_PANE: A pane that allows the user to navigate through and select the contents of a directory
61 *@ATK_ROLE_DRAWING_AREA: An object used for drawing custom user interface elements
62 *@ATK_ROLE_FILE_CHOOSER: A specialized dialog that lets the user choose a file
63 *@ATK_ROLE_FILLER: A object that fills up space in a user interface
64 *@ATK_ROLE_FONT_CHOOSER: A specialized dialog that lets the user choose a font
65 *@ATK_ROLE_FRAME: A top level window with a title bar, border, menubar, etc.
66 *@ATK_ROLE_GLASS_PANE: A pane that is guaranteed to be painted on top of all panes beneath it
67 *@ATK_ROLE_HTML_CONTAINER: A document container for HTML, whose children represent the document content
68 *@ATK_ROLE_ICON: A small fixed size picture, typically used to decorate components
69 *@ATK_ROLE_IMAGE: An object whose primary purpose is to display an image
70 *@ATK_ROLE_INTERNAL_FRAME: A frame-like object that is clipped by a desktop pane
71 *@ATK_ROLE_LABEL: An object used to present an icon or short string in an interface
72 *@ATK_ROLE_LAYERED_PANE: A specialized pane that allows its children to be drawn in layers, providing a form of stacking order
73 *@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
74 *@ATK_ROLE_LIST_ITEM: An object that represents an element of a list
75 *@ATK_ROLE_MENU: An object usually found inside a menu bar that contains a list of actions the user can choose from
76 *@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
77 *@ATK_ROLE_MENU_ITEM: An object usually contained in a menu that presents an action the user can choose
78 *@ATK_ROLE_OPTION_PANE: A specialized pane whose primary use is inside a DIALOG
79 *@ATK_ROLE_PAGE_TAB: An object that is a child of a page tab list
80 *@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
81 *@ATK_ROLE_PANEL: A generic container that is often used to group objects
82 *@ATK_ROLE_PASSWORD_TEXT: A text object uses for passwords, or other places where the text content is not shown visibly to the user
83 *@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
84 *@ATK_ROLE_PROGRESS_BAR: An object used to indicate how much of a task has been completed
85 *@ATK_ROLE_PUSH_BUTTON: An object the user can manipulate to tell the application to do something
86 *@ATK_ROLE_RADIO_BUTTON: A specialized check box that will cause other radio buttons in the same group to become unchecked when this one is checked
87 *@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
88 *@ATK_ROLE_ROOT_PANE: A specialized pane that has a glass pane and a layered pane as its children
89 *@ATK_ROLE_ROW_HEADER: The header for a row of data
90 *@ATK_ROLE_SCROLL_BAR: An object usually used to allow a user to incrementally view a large amount of data.
91 *@ATK_ROLE_SCROLL_PANE: An object that allows a user to incrementally view a large amount of information
92 *@ATK_ROLE_SEPARATOR: An object usually contained in a menu to provide a visible and logical separation of the contents in a menu
93 *@ATK_ROLE_SLIDER: An object that allows the user to select from a bounded range
94 *@ATK_ROLE_SPLIT_PANE: A specialized panel that presents two other panels at the same time
95 *@ATK_ROLE_SPIN_BUTTON: An object used to get an integer or floating point number from the user
96 *@ATK_ROLE_STATUSBAR: An object which reports messages of minor importance to the user
97 *@ATK_ROLE_TABLE: An object used to represent information in terms of rows and columns
98 *@ATK_ROLE_TABLE_CELL: A cell in a table
99 *@ATK_ROLE_TABLE_COLUMN_HEADER: The header for a column of a table
100 *@ATK_ROLE_TABLE_ROW_HEADER: The header for a row of a table
101 *@ATK_ROLE_TEAR_OFF_MENU_ITEM: A menu item used to tear off and reattach its menu
102 *@ATK_ROLE_TERMINAL: An object that represents an accessible terminal
103 *@ATK_ROLE_TEXT: An object that presents text to the user
104 *@ATK_ROLE_TOGGLE_BUTTON: A specialized push button that can be checked or unchecked, but does not provide a separate indicator for the current state
105 *@ATK_ROLE_TOOL_BAR: A bar or palette usually composed of push buttons or toggle buttons
106 *@ATK_ROLE_TOOL_TIP: An object that provides information about another object
107 *@ATK_ROLE_TREE: An object used to represent hierarchical information to the user
108 *@ATK_ROLE_TREE_TABLE: An object capable of expanding and collapsing rows as well as showing multiple columns of data
109 *@ATK_ROLE_UNKNOWN: The object contains some Accessible information, but its role is not known
110 *@ATK_ROLE_VIEWPORT: An object usually used in a scroll pane
111 *@ATK_ROLE_WINDOW: A top level window with no title or border.
112 *@ATK_ROLE_HEADER: An object that serves as a document header.
113 *@ATK_ROLE_FOOTER: An object that serves as a document footer.
114 *@ATK_ROLE_PARAGRAPH: An object which is contains a paragraph of text content.
115 *@ATK_ROLE_RULER: An object which describes margins and tab stops, etc. for text objects which it controls (should have CONTROLLER_FOR relation to such).
116 *@ATK_ROLE_LAST_DEFINED: not a valid role, used for finding end of enumeration
118 *Describes the role of an object
122 ATK_ROLE_INVALID = 0,
123 ATK_ROLE_ACCEL_LABEL,
130 ATK_ROLE_CHECK_MENU_ITEM,
131 ATK_ROLE_COLOR_CHOOSER,
132 ATK_ROLE_COLUMN_HEADER,
134 ATK_ROLE_DATE_EDITOR,
135 ATK_ROLE_DESKTOP_ICON,
136 ATK_ROLE_DESKTOP_FRAME,
139 ATK_ROLE_DIRECTORY_PANE,
140 ATK_ROLE_DRAWING_AREA,
141 ATK_ROLE_FILE_CHOOSER,
143 ATK_ROLE_FONT_CHOOSER,
146 ATK_ROLE_HTML_CONTAINER,
149 ATK_ROLE_INTERNAL_FRAME,
151 ATK_ROLE_LAYERED_PANE,
157 ATK_ROLE_OPTION_PANE,
159 ATK_ROLE_PAGE_TAB_LIST,
161 ATK_ROLE_PASSWORD_TEXT,
163 ATK_ROLE_PROGRESS_BAR,
164 ATK_ROLE_PUSH_BUTTON,
165 ATK_ROLE_RADIO_BUTTON,
166 ATK_ROLE_RADIO_MENU_ITEM,
170 ATK_ROLE_SCROLL_PANE,
174 ATK_ROLE_SPIN_BUTTON,
178 ATK_ROLE_TABLE_COLUMN_HEADER,
179 ATK_ROLE_TABLE_ROW_HEADER,
180 ATK_ROLE_TEAR_OFF_MENU_ITEM,
183 ATK_ROLE_TOGGLE_BUTTON,
195 ATK_ROLE_LAST_DEFINED
198 AtkRole atk_role_register (const gchar *name);
202 *@ATK_LAYER_INVALID: The object does not have a layer
203 *@ATK_LAYER_BACKGROUND: This layer is reserved for the desktop background
204 *@ATK_LAYER_CANVAS: This layer is used for Canvas components
205 *@ATK_LAYER_WIDGET: This layer is normally used for components
206 *@ATK_LAYER_MDI: This layer is used for layered components
207 *@ATK_LAYER_POPUP: This layer is used for popup components, such as menus
208 *@ATK_LAYER_OVERLAY: This layer is reserved for future use.
209 *@ATK_LAYER_WINDOW: This layer is used for toplevel windows.
211 * Describes the layer of a component
216 ATK_LAYER_BACKGROUND,
225 #define ATK_TYPE_OBJECT (atk_object_get_type ())
226 #define ATK_OBJECT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), ATK_TYPE_OBJECT, AtkObject))
227 #define ATK_OBJECT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), ATK_TYPE_OBJECT, AtkObjectClass))
228 #define ATK_IS_OBJECT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), ATK_TYPE_OBJECT))
229 #define ATK_IS_OBJECT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), ATK_TYPE_OBJECT))
230 #define ATK_OBJECT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), ATK_TYPE_OBJECT, AtkObjectClass))
232 #define ATK_TYPE_IMPLEMENTOR (atk_implementor_get_type ())
233 #define ATK_IS_IMPLEMENTOR(obj) G_TYPE_CHECK_INSTANCE_TYPE ((obj), ATK_TYPE_IMPLEMENTOR)
234 #define ATK_IMPLEMENTOR(obj) G_TYPE_CHECK_INSTANCE_CAST ((obj), ATK_TYPE_IMPLEMENTOR, AtkImplementor)
235 #define ATK_IMPLEMENTOR_GET_IFACE(obj) (G_TYPE_INSTANCE_GET_INTERFACE ((obj), ATK_TYPE_IMPLEMENTOR, AtkImplementorIface))
238 typedef struct _AtkImplementor AtkImplementor; /* dummy typedef */
239 typedef struct _AtkImplementorIface AtkImplementorIface;
242 typedef struct _AtkObject AtkObject;
243 typedef struct _AtkObjectClass AtkObjectClass;
244 typedef struct _AtkRelationSet AtkRelationSet;
245 typedef struct _AtkStateSet AtkStateSet;
247 struct _AtkPropertyValues
249 const gchar *property_name;
254 typedef struct _AtkPropertyValues AtkPropertyValues;
256 typedef gboolean (*AtkFunction) (gpointer data);
258 * For most properties the old_value field of AtkPropertyValues will
259 * not contain a valid value.
261 * Currently, the only property for which old_value is used is
262 * accessible-state; for instance if there is a focus state the
263 * property change handler will be called for the object which lost the focus
264 * with the old_value containing an AtkState value corresponding to focused
265 * and the property change handler will be called for the object which
266 * received the focus with the new_value containing an AtkState value
267 * corresponding to focused.
269 typedef void (*AtkPropertyChangeHandler) (AtkObject*, AtkPropertyValues*);
278 AtkObject *accessible_parent;
280 AtkRelationSet *relation_set;
284 struct _AtkObjectClass
289 * Gets the accessible name of the object
291 G_CONST_RETURN gchar* (* get_name) (AtkObject *accessible);
293 * Gets the accessible description of the object
295 G_CONST_RETURN gchar* (* get_description) (AtkObject *accessible);
297 * Gets the accessible parent of the object
299 AtkObject* (*get_parent) (AtkObject *accessible);
302 * Gets the number of accessible children of the object
304 gint (* get_n_children) (AtkObject *accessible);
306 * Returns a reference to the specified accessible child of the object.
307 * The accessible children are 0-based so the first accessible child is
308 * at index 0, the second at index 1 and so on.
310 AtkObject* (* ref_child) (AtkObject *accessible,
313 * Gets the 0-based index of this object in its parent; returns -1 if the
314 * object does not have an accessible parent.
316 gint (* get_index_in_parent) (AtkObject *accessible);
318 * Gets the RelationSet associated with the object
320 AtkRelationSet* (* ref_relation_set) (AtkObject *accessible);
322 * Gets the role of the object
324 AtkRole (* get_role) (AtkObject *accessible);
325 AtkLayer (* get_layer) (AtkObject *accessible);
326 gint (* get_mdi_zorder) (AtkObject *accessible);
328 * Gets the state set of the object
330 AtkStateSet* (* ref_state_set) (AtkObject *accessible);
332 * Sets the accessible name of the object
334 void (* set_name) (AtkObject *accessible,
337 * Sets the accessible description of the object
339 void (* set_description) (AtkObject *accessible,
340 const gchar *description);
342 * Sets the accessible parent of the object
344 void (* set_parent) (AtkObject *accessible,
347 * Sets the accessible role of the object
349 void (* set_role) (AtkObject *accessible,
352 * Specifies a function to be called when a property changes value
354 guint (* connect_property_change_handler) (AtkObject
356 AtkPropertyChangeHandler *handler);
358 * Removes a property change handler which was specified using
359 * connect_property_change_handler
361 void (* remove_property_change_handler) (AtkObject
365 void (* initialize) (AtkObject *accessible,
368 * The signal handler which is executed when there is a change in the
369 * children of the object
371 void (* children_changed) (AtkObject *accessible,
373 gpointer changed_child);
375 * The signal handler which is executed when there is a focus event
378 void (* focus_event) (AtkObject *accessible,
381 * The signal handler which is executed when there is a property_change
382 * signal for an object.
384 void (* property_change) (AtkObject *accessible,
385 AtkPropertyValues *values);
387 * The signal handler which is executed when there is a state_change
388 * signal for an object.
390 void (* state_change) (AtkObject *accessible,
394 * The signal handler which is executed when there is a change in the
395 * visible data for an object
397 void (*visible_data_changed) (AtkObject *accessible);
405 GType atk_object_get_type (void);
407 struct _AtkImplementorIface
409 GTypeInterface parent;
411 AtkObject* (*ref_accessible) (AtkImplementor *implementor);
413 GType atk_implementor_get_type (void);
416 * This method uses the ref_accessible method in AtkImplementorIface,
417 * if the object's class implements AtkImplementorIface.
418 * Otherwise it returns %NULL.
421 * Note also that because this method may return flyweight objects,
422 * it increments the returned AtkObject's reference count.
423 * Therefore it is the responsibility of the calling
424 * program to unreference the object when no longer needed.
425 * (c.f. gtk_widget_get_accessible() where this is not the case).
427 AtkObject* atk_implementor_ref_accessible (AtkImplementor *implementor);
430 * Properties directly supported by AtkObject
433 G_CONST_RETURN gchar* atk_object_get_name (AtkObject *accessible);
434 G_CONST_RETURN gchar* atk_object_get_description (AtkObject *accessible);
435 AtkObject* atk_object_get_parent (AtkObject *accessible);
436 gint atk_object_get_n_accessible_children (AtkObject *accessible);
437 AtkObject* atk_object_ref_accessible_child (AtkObject *accessible,
439 AtkRelationSet* atk_object_ref_relation_set (AtkObject *accessible);
440 AtkRole atk_object_get_role (AtkObject *accessible);
441 AtkLayer atk_object_get_layer (AtkObject *accessible);
442 gint atk_object_get_mdi_zorder (AtkObject *accessible);
443 AtkStateSet* atk_object_ref_state_set (AtkObject *accessible);
444 gint atk_object_get_index_in_parent (AtkObject *accessible);
445 void atk_object_set_name (AtkObject *accessible,
447 void atk_object_set_description (AtkObject *accessible,
448 const gchar *description);
449 void atk_object_set_parent (AtkObject *accessible,
451 void atk_object_set_role (AtkObject *accessible,
455 guint atk_object_connect_property_change_handler (AtkObject *accessible,
456 AtkPropertyChangeHandler *handler);
457 void atk_object_remove_property_change_handler (AtkObject *accessible,
460 void atk_object_notify_state_change (AtkObject *accessible,
463 void atk_object_initialize (AtkObject *accessible,
466 G_CONST_RETURN gchar* atk_role_get_name (AtkRole role);
467 AtkRole atk_role_for_name (const gchar *name);
470 /* NEW in 1.1: convenience API */
471 gboolean atk_object_add_relationship (AtkObject *object,
472 AtkRelationType relationship,
474 gboolean atk_object_remove_relationship (AtkObject *object,
475 AtkRelationType relationship,
477 G_CONST_RETURN gchar* atk_role_get_localized_name (AtkRole role);
481 * Note: the properties which are registered with the GType
482 * property registry, for type ATK_TYPE_OBJECT, are as follows:
485 * "accessible-description"
486 * "accessible-parent"
489 * "accessible-component-layer"
490 * "accessible-component-zorder"
491 * "accessible-table-caption"
492 * "accessible-table-column-description"
493 * "accessible-table-column-header"
494 * "accessible-table-row-description"
495 * "accessible-table-row-header"
496 * "accessible-table-summary"
499 * accessibility property change listeners should use the
500 * normal GObject property interfaces and "property-change"
501 * signal handler semantics to interpret the property change
502 * information relayed from AtkObject.
503 * (AtkObject instances will connect to the "notify"
504 * signal in their host objects, and relay the signals when appropriate).
507 /* For other signals, see related interfaces
518 * The usage model for obtaining these interface instances is:
519 * ATK_<interfacename>_GET_IFACE(GObject *accessible),
520 * where accessible, though specified as a GObject, is
521 * the AtkObject instance being queried.
522 * More usually, the interface will be used via a cast to the
523 * interface's corresponding "type":
525 * AtkText textImpl = ATK_TEXT(accessible);
528 * cpos = atk_text_get_caret_position(textImpl);
531 * If it's known in advance that accessible implements AtkTextIface,
532 * this is shortened to:
534 * cpos = atk_text_get_caret_position (ATK_TEXT (accessible));
539 #endif /* __cplusplus */
542 #endif /* __ATK_OBJECT_H__ */