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_APPLICATION: The object is an application object, which may contain @ATK_ROLE_FRAME objects or other types of accessibles.
117 *@ATK_ROLE_AUTOCOMPLETE: The object is a dialog or list containing items for insertion into an entry widget, for instance a list of words for completion of a text entry.
118 *@ATK_ROLE_EDITBAR: The object is an editable text object in a toolbar
119 *@ATK_ROLE_EMBEDDED: The object is an embedded container within a document or panel. This role is a grouping "hint" indicating that the contained objects share a context.
120 *@ATK_ROLE_ENTRY: The object is a component whose textual content may be entered or modified by the user, provided @ATK_STATE_EDITABLE is present.
121 *@ATK_ROLE_CHART: The object is a graphical depiction of quantitative data. It may contain multiple subelements whose attributes and/or description may be queried to obtain both the quantitative data and information about how the data is being presented. The LABELLED_BY relation is particularly important in interpreting objects of this type, as is the accessible-description property.
122 *@ATK_ROLE_CAPTION: The object contains descriptive information, usually textual, about another user interface element such as a table, chart, or image.
123 *@ATK_ROLE_DOCUMENT_FRAME: The object is a visual frame or container which contains a view of document content. Document frames may occur within another Document instance, in which case the second document may be said to be embedded in the containing instance. HTML frames are often ROLE_DOCUMENT_FRAME. Either this object, or a singleton descendant, should implement the Document interface.
124 *@ATK_ROLE_HEADING: The object serves as a heading for content which follows it in a document. The 'heading level' of the heading, if availabe, may be obtained by querying the object's attributes.
125 *@ATK_ROLE_PAGE: The object is a containing instance which encapsulates a page of information. @ATK_ROLE_PAGE is used in documents and content which support a paginated navigation model.
126 *@ATK_ROLE_SECTION: The object is a containing instance of document content which constitutes a particular 'logical' section of the document. The type of content within a section, and the nature of the section division itself, may be obtained by querying the object's attributes. Sections may be nested.
127 *@ATK_ROLE_REDUNDANT_OBJECT: The object is redundant with another object in the hierarchy, and is exposed for purely technical reasons. Objects of this role should normally be ignored by clients.
128 *@ATK_ROLE_FORM: The object is a container for form controls, for instance as part of a
129 * web form or user-input form within a document. This role is primarily a tag/convenience for
130 * clients when navigating complex documents, it is not expected that ordinary GUI containers will
131 * always have ATK_ROLE_FORM.
132 *@ATK_ROLE_LINK: The object is a hypertext anchor, i.e. a "link" in a
133 * hypertext document. Such objects are distinct from 'inline'
134 * content which may also use the Hypertext/Hyperlink interfaces
135 * to indicate the range/location within a text object where
136 * an inline or embedded object lies.
137 *@ATK_ROLE_LAST_DEFINED: not a valid role, used for finding end of the enumeration
139 * Describes the role of an object
141 * These are the built-in enumerated roles that UI components can have in
142 * ATK. Other roles may be added at runtime, so an AtkRole >=
143 * ATK_ROLE_LAST_DEFINED is not necessarily an error.
147 ATK_ROLE_INVALID = 0,
148 ATK_ROLE_ACCEL_LABEL,
155 ATK_ROLE_CHECK_MENU_ITEM,
156 ATK_ROLE_COLOR_CHOOSER,
157 ATK_ROLE_COLUMN_HEADER,
159 ATK_ROLE_DATE_EDITOR,
160 ATK_ROLE_DESKTOP_ICON,
161 ATK_ROLE_DESKTOP_FRAME,
164 ATK_ROLE_DIRECTORY_PANE,
165 ATK_ROLE_DRAWING_AREA,
166 ATK_ROLE_FILE_CHOOSER,
168 ATK_ROLE_FONT_CHOOSER,
171 ATK_ROLE_HTML_CONTAINER,
174 ATK_ROLE_INTERNAL_FRAME,
176 ATK_ROLE_LAYERED_PANE,
182 ATK_ROLE_OPTION_PANE,
184 ATK_ROLE_PAGE_TAB_LIST,
186 ATK_ROLE_PASSWORD_TEXT,
188 ATK_ROLE_PROGRESS_BAR,
189 ATK_ROLE_PUSH_BUTTON,
190 ATK_ROLE_RADIO_BUTTON,
191 ATK_ROLE_RADIO_MENU_ITEM,
195 ATK_ROLE_SCROLL_PANE,
199 ATK_ROLE_SPIN_BUTTON,
203 ATK_ROLE_TABLE_COLUMN_HEADER,
204 ATK_ROLE_TABLE_ROW_HEADER,
205 ATK_ROLE_TEAR_OFF_MENU_ITEM,
208 ATK_ROLE_TOGGLE_BUTTON,
220 ATK_ROLE_APPLICATION,
221 ATK_ROLE_AUTOCOMPLETE,
227 ATK_ROLE_DOCUMENT_FRAME,
231 ATK_ROLE_REDUNDANT_OBJECT,
233 ATK_ROLE_LAST_DEFINED
236 AtkRole atk_role_register (const gchar *name);
240 *@ATK_LAYER_INVALID: The object does not have a layer
241 *@ATK_LAYER_BACKGROUND: This layer is reserved for the desktop background
242 *@ATK_LAYER_CANVAS: This layer is used for Canvas components
243 *@ATK_LAYER_WIDGET: This layer is normally used for components
244 *@ATK_LAYER_MDI: This layer is used for layered components
245 *@ATK_LAYER_POPUP: This layer is used for popup components, such as menus
246 *@ATK_LAYER_OVERLAY: This layer is reserved for future use.
247 *@ATK_LAYER_WINDOW: This layer is used for toplevel windows.
249 * Describes the layer of a component
251 * These enumerated "layer values" are used when determining which UI
252 * rendering layer a component is drawn into, which can help in making
253 * determinations of when components occlude one another.
258 ATK_LAYER_BACKGROUND,
270 * This is a singly-linked list (a #GSList) of #AtkAttribute. It is
271 * used by atk_text_get_run_attributes(), atk_text_get_default_attributes()
272 * and atk_editable_text_set_run_attributes()
274 typedef GSList AtkAttributeSet;
278 * @name: The attribute name. Call atk_text_attr_get_name()
279 * @value: the value of the attribute, represented as a string.
280 * Call atk_text_attr_get_value() for those which are strings.
281 * For values which are numbers, the string representation of the number
284 * A string name/value pair representing a text attribute.
286 typedef struct _AtkAttribute AtkAttribute;
288 struct _AtkAttribute {
293 #define ATK_TYPE_OBJECT (atk_object_get_type ())
294 #define ATK_OBJECT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), ATK_TYPE_OBJECT, AtkObject))
295 #define ATK_OBJECT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), ATK_TYPE_OBJECT, AtkObjectClass))
296 #define ATK_IS_OBJECT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), ATK_TYPE_OBJECT))
297 #define ATK_IS_OBJECT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), ATK_TYPE_OBJECT))
298 #define ATK_OBJECT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), ATK_TYPE_OBJECT, AtkObjectClass))
300 #define ATK_TYPE_IMPLEMENTOR (atk_implementor_get_type ())
301 #define ATK_IS_IMPLEMENTOR(obj) G_TYPE_CHECK_INSTANCE_TYPE ((obj), ATK_TYPE_IMPLEMENTOR)
302 #define ATK_IMPLEMENTOR(obj) G_TYPE_CHECK_INSTANCE_CAST ((obj), ATK_TYPE_IMPLEMENTOR, AtkImplementor)
303 #define ATK_IMPLEMENTOR_GET_IFACE(obj) (G_TYPE_INSTANCE_GET_INTERFACE ((obj), ATK_TYPE_IMPLEMENTOR, AtkImplementorIface))
306 typedef struct _AtkImplementor AtkImplementor; /* dummy typedef */
307 typedef struct _AtkImplementorIface AtkImplementorIface;
310 typedef struct _AtkObject AtkObject;
311 typedef struct _AtkObjectClass AtkObjectClass;
312 typedef struct _AtkRelationSet AtkRelationSet;
313 typedef struct _AtkStateSet AtkStateSet;
317 * @property_name: The name of the ATK property which is being presented or which has been changed.
318 * @old_value: The old property value, NULL; in some contexts this value is undefined (see note below).
319 * @new_value: The new value of the named property.
321 * @note: For most properties the old_value field of AtkPropertyValues will
322 * not contain a valid value.
324 * Currently, the only property for which old_value is used is
325 * accessible-state; for instance if there is a focus state the
326 * property change handler will be called for the object which lost the focus
327 * with the old_value containing an AtkState value corresponding to focused
328 * and the property change handler will be called for the object which
329 * received the focus with the new_value containing an AtkState value
330 * corresponding to focused.
333 struct _AtkPropertyValues
335 const gchar *property_name;
340 typedef struct _AtkPropertyValues AtkPropertyValues;
342 typedef gboolean (*AtkFunction) (gpointer data);
344 * For most properties the old_value field of AtkPropertyValues will
345 * not contain a valid value.
347 * Currently, the only property for which old_value is used is
348 * accessible-state; for instance if there is a focus state the
349 * property change handler will be called for the object which lost the focus
350 * with the old_value containing an AtkState value corresponding to focused
351 * and the property change handler will be called for the object which
352 * received the focus with the new_value containing an AtkState value
353 * corresponding to focused.
355 typedef void (*AtkPropertyChangeHandler) (AtkObject*, AtkPropertyValues*);
364 AtkObject *accessible_parent;
366 AtkRelationSet *relation_set;
370 struct _AtkObjectClass
375 * Gets the accessible name of the object
377 G_CONST_RETURN gchar* (* get_name) (AtkObject *accessible);
379 * Gets the accessible description of the object
381 G_CONST_RETURN gchar* (* get_description) (AtkObject *accessible);
383 * Gets the accessible parent of the object
385 AtkObject* (*get_parent) (AtkObject *accessible);
388 * Gets the number of accessible children of the object
390 gint (* get_n_children) (AtkObject *accessible);
392 * Returns a reference to the specified accessible child of the object.
393 * The accessible children are 0-based so the first accessible child is
394 * at index 0, the second at index 1 and so on.
396 AtkObject* (* ref_child) (AtkObject *accessible,
399 * Gets the 0-based index of this object in its parent; returns -1 if the
400 * object does not have an accessible parent.
402 gint (* get_index_in_parent) (AtkObject *accessible);
404 * Gets the RelationSet associated with the object
406 AtkRelationSet* (* ref_relation_set) (AtkObject *accessible);
408 * Gets the role of the object
410 AtkRole (* get_role) (AtkObject *accessible);
411 AtkLayer (* get_layer) (AtkObject *accessible);
412 gint (* get_mdi_zorder) (AtkObject *accessible);
414 * Gets the state set of the object
416 AtkStateSet* (* ref_state_set) (AtkObject *accessible);
418 * Sets the accessible name of the object
420 void (* set_name) (AtkObject *accessible,
423 * Sets the accessible description of the object
425 void (* set_description) (AtkObject *accessible,
426 const gchar *description);
428 * Sets the accessible parent of the object
430 void (* set_parent) (AtkObject *accessible,
433 * Sets the accessible role of the object
435 void (* set_role) (AtkObject *accessible,
438 * Specifies a function to be called when a property changes value
440 guint (* connect_property_change_handler) (AtkObject
442 AtkPropertyChangeHandler *handler);
444 * Removes a property change handler which was specified using
445 * connect_property_change_handler
447 void (* remove_property_change_handler) (AtkObject
451 void (* initialize) (AtkObject *accessible,
454 * The signal handler which is executed when there is a change in the
455 * children of the object
457 void (* children_changed) (AtkObject *accessible,
459 gpointer changed_child);
461 * The signal handler which is executed when there is a focus event
464 void (* focus_event) (AtkObject *accessible,
467 * The signal handler which is executed when there is a property_change
468 * signal for an object.
470 void (* property_change) (AtkObject *accessible,
471 AtkPropertyValues *values);
473 * The signal handler which is executed when there is a state_change
474 * signal for an object.
476 void (* state_change) (AtkObject *accessible,
480 * The signal handler which is executed when there is a change in the
481 * visible data for an object
483 void (*visible_data_changed) (AtkObject *accessible);
486 * The signal handler which is executed when there is a change in the
487 * 'active' child or children of the object, for instance when
488 * interior focus changes in a table or list. This signal should be emitted
489 * by objects whose state includes ATK_STATE_MANAGES_DESCENDANTS.
491 void (*active_descendant_changed) (AtkObject *accessible,
495 * Gets a list of properties applied to this object as a whole, as an #AtkAttributeSet consisting of name-value pairs.
498 AtkAttributeSet* (*get_attributes) (AtkObject *accessible);
503 GType atk_object_get_type (void);
505 struct _AtkImplementorIface
507 GTypeInterface parent;
509 AtkObject* (*ref_accessible) (AtkImplementor *implementor);
511 GType atk_implementor_get_type (void);
514 * This method uses the ref_accessible method in AtkImplementorIface,
515 * if the object's class implements AtkImplementorIface.
516 * Otherwise it returns %NULL.
519 * Note also that because this method may return flyweight objects,
520 * it increments the returned AtkObject's reference count.
521 * Therefore it is the responsibility of the calling
522 * program to unreference the object when no longer needed.
523 * (c.f. gtk_widget_get_accessible() where this is not the case).
525 AtkObject* atk_implementor_ref_accessible (AtkImplementor *implementor);
528 * Properties directly supported by AtkObject
531 G_CONST_RETURN gchar* atk_object_get_name (AtkObject *accessible);
532 G_CONST_RETURN gchar* atk_object_get_description (AtkObject *accessible);
533 AtkObject* atk_object_get_parent (AtkObject *accessible);
534 gint atk_object_get_n_accessible_children (AtkObject *accessible);
535 AtkObject* atk_object_ref_accessible_child (AtkObject *accessible,
537 AtkRelationSet* atk_object_ref_relation_set (AtkObject *accessible);
538 AtkRole atk_object_get_role (AtkObject *accessible);
539 AtkLayer atk_object_get_layer (AtkObject *accessible);
540 gint atk_object_get_mdi_zorder (AtkObject *accessible);
541 AtkAttributeSet* atk_object_get_attributes (AtkObject *accessible);
542 AtkStateSet* atk_object_ref_state_set (AtkObject *accessible);
543 gint atk_object_get_index_in_parent (AtkObject *accessible);
544 void atk_object_set_name (AtkObject *accessible,
546 void atk_object_set_description (AtkObject *accessible,
547 const gchar *description);
548 void atk_object_set_parent (AtkObject *accessible,
550 void atk_object_set_role (AtkObject *accessible,
554 guint atk_object_connect_property_change_handler (AtkObject *accessible,
555 AtkPropertyChangeHandler *handler);
556 void atk_object_remove_property_change_handler (AtkObject *accessible,
559 void atk_object_notify_state_change (AtkObject *accessible,
562 void atk_object_initialize (AtkObject *accessible,
565 G_CONST_RETURN gchar* atk_role_get_name (AtkRole role);
566 AtkRole atk_role_for_name (const gchar *name);
569 /* NEW in 1.1: convenience API */
570 gboolean atk_object_add_relationship (AtkObject *object,
571 AtkRelationType relationship,
573 gboolean atk_object_remove_relationship (AtkObject *object,
574 AtkRelationType relationship,
576 G_CONST_RETURN gchar* atk_role_get_localized_name (AtkRole role);
582 * Note: the properties which are registered with the GType
583 * property registry, for type ATK_TYPE_OBJECT, are as follows:
586 * "accessible-description"
587 * "accessible-parent"
590 * "accessible-component-layer"
591 * "accessible-component-zorder"
592 * "accessible-table-caption"
593 * "accessible-table-column-description"
594 * "accessible-table-column-header"
595 * "accessible-table-row-description"
596 * "accessible-table-row-header"
597 * "accessible-table-summary"
600 * accessibility property change listeners should use the
601 * normal GObject property interfaces and "property-change"
602 * signal handler semantics to interpret the property change
603 * information relayed from AtkObject.
604 * (AtkObject instances will connect to the "notify"
605 * signal in their host objects, and relay the signals when appropriate).
608 /* For other signals, see related interfaces
619 * The usage model for obtaining these interface instances is:
620 * ATK_<interfacename>_GET_IFACE(GObject *accessible),
621 * where accessible, though specified as a GObject, is
622 * the AtkObject instance being queried.
623 * More usually, the interface will be used via a cast to the
624 * interface's corresponding "type":
626 * AtkText textImpl = ATK_TEXT(accessible);
629 * cpos = atk_text_get_caret_position(textImpl);
632 * If it's known in advance that accessible implements AtkTextIface,
633 * this is shortened to:
635 * cpos = atk_text_get_caret_position (ATK_TEXT (accessible));
640 #endif /* __cplusplus */
643 #endif /* __ATK_OBJECT_H__ */