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atkobject.h

/* 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_OBJECT_H__
#define __ATK_OBJECT_H__

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

#include <glib-object.h>
#include <atk/atkstate.h>
#include <atk/atkrelationtype.h>

/*
 * AtkObject represents the minimum information all accessible objects
 * return. This information includes accessible name, accessible
 * description, role and state of the object, as well information about
 * its parent and children. It is also possible to obtain more specific
 * accessibility information about a component if it supports one or more
 * of the following interfaces:
 */


/**
 *AtkRole:
 *@ATK_ROLE_INVALID: Invalid role
 *@ATK_ROLE_ACCEL_LABEL: A label which represents an accelerator
 *@ATK_ROLE_ALERT: An object which is an alert to the user
 *@ATK_ROLE_ANIMATION: An object which is an animated image
 *@ATK_ROLE_ARROW: An arrow in one of the four cardinal directions
 *@ATK_ROLE_CALENDAR:  An object that displays a calendar and allows the user to select a date
 *@ATK_ROLE_CANVAS: An object that can be drawn into and is used to trap events
 *@ATK_ROLE_CHECK_BOX: A choice that can be checked or unchecked and provides a separate indicator for the current state
 *@ATK_ROLE_CHECK_MENU_ITEM: A menu item with a check box
 *@ATK_ROLE_COLOR_CHOOSER: A specialized dialog that lets the user choose a color
 *@ATK_ROLE_COLUMN_HEADER: The header for a column of data
 *@ATK_ROLE_COMBO_BOX: A list of choices the user can select from
 *@ATK_ROLE_DATE_EDITOR: An object whose purpose is to allow a user to edit a date
 *@ATK_ROLE_DESKTOP_ICON: An inconifed internal frame within a DESKTOP_PANE
 *@ATK_ROLE_DESKTOP_FRAME: A pane that supports internal frames and iconified versions of those internal frames
 *@ATK_ROLE_DIAL: An object whose purpose is to allow a user to set a value
 *@ATK_ROLE_DIALOG: A top level window with title bar and a border
 *@ATK_ROLE_DIRECTORY_PANE: A pane that allows the user to navigate through and select the contents of a directory
 *@ATK_ROLE_DRAWING_AREA: An object used for drawing custom user interface elements
 *@ATK_ROLE_FILE_CHOOSER: A specialized dialog that lets the user choose a file
 *@ATK_ROLE_FILLER: A object that fills up space in a user interface
 *@ATK_ROLE_FONT_CHOOSER: A specialized dialog that lets the user choose a font
 *@ATK_ROLE_FRAME: A top level window with a title bar, border, menubar, etc.
 *@ATK_ROLE_GLASS_PANE: A pane that is guaranteed to be painted on top of all panes beneath it
 *@ATK_ROLE_HTML_CONTAINER: A document container for HTML, whose children represent the document content
 *@ATK_ROLE_ICON: A small fixed size picture, typically used to decorate components
 *@ATK_ROLE_IMAGE: An object whose primary purpose is to display an image
 *@ATK_ROLE_INTERNAL_FRAME: A frame-like object that is clipped by a desktop pane
 *@ATK_ROLE_LABEL: An object used to present an icon or short string in an interface
 *@ATK_ROLE_LAYERED_PANE: A specialized pane that allows its children to be drawn in layers, providing a form of stacking order
 *@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 
 *@ATK_ROLE_LIST_ITEM: An object that represents an element of a list 
 *@ATK_ROLE_MENU: An object usually found inside a menu bar that contains a list of actions the user can choose from
 *@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 
 *@ATK_ROLE_MENU_ITEM: An object usually contained in a menu that presents an action the user can choose
 *@ATK_ROLE_OPTION_PANE: A specialized pane whose primary use is inside a DIALOG
 *@ATK_ROLE_PAGE_TAB: An object that is a child of a page tab list
 *@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 
 *@ATK_ROLE_PANEL: A generic container that is often used to group objects
 *@ATK_ROLE_PASSWORD_TEXT: A text object uses for passwords, or other places where the text content is not shown visibly to the user
 *@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
 *@ATK_ROLE_PROGRESS_BAR: An object used to indicate how much of a task has been completed
 *@ATK_ROLE_PUSH_BUTTON: An object the user can manipulate to tell the application to do something
 *@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
 *@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
 *@ATK_ROLE_ROOT_PANE: A specialized pane that has a glass pane and a layered pane as its children
 *@ATK_ROLE_ROW_HEADER: The header for a row of data
 *@ATK_ROLE_SCROLL_BAR: An object usually used to allow a user to incrementally view a large amount of data.
 *@ATK_ROLE_SCROLL_PANE: An object that allows a user to incrementally view a large amount of information
 *@ATK_ROLE_SEPARATOR: An object usually contained in a menu to provide a visible and logical separation of the contents in a menu
 *@ATK_ROLE_SLIDER: An object that allows the user to select from a bounded range
 *@ATK_ROLE_SPLIT_PANE: A specialized panel that presents two other panels at the same time
 *@ATK_ROLE_SPIN_BUTTON: An object used to get an integer or floating point number from the user
 *@ATK_ROLE_STATUSBAR: An object which reports messages of minor importance to the user
 *@ATK_ROLE_TABLE: An object used to represent information in terms of rows and columns
 *@ATK_ROLE_TABLE_CELL: A cell in a table
 *@ATK_ROLE_TABLE_COLUMN_HEADER: The header for a column of a table
 *@ATK_ROLE_TABLE_ROW_HEADER: The header for a row of a table
 *@ATK_ROLE_TEAR_OFF_MENU_ITEM: A menu item used to tear off and reattach its menu
 *@ATK_ROLE_TERMINAL: An object that represents an accessible terminal
 *@ATK_ROLE_TEXT: An object that presents text to the user
 *@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
 *@ATK_ROLE_TOOL_BAR: A bar or palette usually composed of push buttons or toggle buttons
 *@ATK_ROLE_TOOL_TIP: An object that provides information about another object
 *@ATK_ROLE_TREE: An object used to represent hierarchical information to the user
 *@ATK_ROLE_TREE_TABLE: An object capable of expanding and collapsing rows as well as showing multiple columns of data
 *@ATK_ROLE_UNKNOWN: The object contains some Accessible information, but its role is not known
 *@ATK_ROLE_VIEWPORT: An object usually used in a scroll pane
 *@ATK_ROLE_WINDOW: A top level window with no title or border.
 *@ATK_ROLE_HEADER: An object that serves as a document header.
 *@ATK_ROLE_FOOTER: An object that serves as a document footer.
 *@ATK_ROLE_PARAGRAPH: An object which is contains a paragraph of text content.
 *@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).
 *@ATK_ROLE_APPLICATION: The object is an application object, which may contain @ATK_ROLE_FRAME objects or other types of accessibles.
 *@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.
 *@ATK_ROLE_EDITBAR: The object is an editable text object in a toolbar
 *@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.
 *@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.
 *@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.
 *@ATK_ROLE_CAPTION: The object contains descriptive information, usually textual, about another user interface element such as a table, chart, or image.
 *@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.
 *@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.
 *@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.
 *@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.
 *@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.
 *@ATK_ROLE_LAST_DEFINED: not a valid role, used for finding end of the enumeration
 * 
 * Describes the role of an object
 *
 * These are the built-in enumerated roles that UI components can have in
 * ATK.  Other roles may be added at runtime, so an AtkRole >=
 * ATK_ROLE_LAST_DEFINED is not necessarily an error.
 **/
typedef enum
{
  ATK_ROLE_INVALID = 0, 
  ATK_ROLE_ACCEL_LABEL,
  ATK_ROLE_ALERT,
  ATK_ROLE_ANIMATION,
  ATK_ROLE_ARROW,
  ATK_ROLE_CALENDAR,
  ATK_ROLE_CANVAS,
  ATK_ROLE_CHECK_BOX,
  ATK_ROLE_CHECK_MENU_ITEM,
  ATK_ROLE_COLOR_CHOOSER,
  ATK_ROLE_COLUMN_HEADER,
  ATK_ROLE_COMBO_BOX,
  ATK_ROLE_DATE_EDITOR,
  ATK_ROLE_DESKTOP_ICON,
  ATK_ROLE_DESKTOP_FRAME,
  ATK_ROLE_DIAL,
  ATK_ROLE_DIALOG,
  ATK_ROLE_DIRECTORY_PANE,
  ATK_ROLE_DRAWING_AREA,
  ATK_ROLE_FILE_CHOOSER,
  ATK_ROLE_FILLER,
  ATK_ROLE_FONT_CHOOSER,
  ATK_ROLE_FRAME,
  ATK_ROLE_GLASS_PANE,
  ATK_ROLE_HTML_CONTAINER,
  ATK_ROLE_ICON,
  ATK_ROLE_IMAGE,
  ATK_ROLE_INTERNAL_FRAME,
  ATK_ROLE_LABEL,
  ATK_ROLE_LAYERED_PANE,
  ATK_ROLE_LIST,
  ATK_ROLE_LIST_ITEM,
  ATK_ROLE_MENU,
  ATK_ROLE_MENU_BAR,
  ATK_ROLE_MENU_ITEM,
  ATK_ROLE_OPTION_PANE,
  ATK_ROLE_PAGE_TAB,
  ATK_ROLE_PAGE_TAB_LIST,
  ATK_ROLE_PANEL,
  ATK_ROLE_PASSWORD_TEXT,
  ATK_ROLE_POPUP_MENU,
  ATK_ROLE_PROGRESS_BAR,
  ATK_ROLE_PUSH_BUTTON,
  ATK_ROLE_RADIO_BUTTON,
  ATK_ROLE_RADIO_MENU_ITEM,
  ATK_ROLE_ROOT_PANE,
  ATK_ROLE_ROW_HEADER,
  ATK_ROLE_SCROLL_BAR,
  ATK_ROLE_SCROLL_PANE,
  ATK_ROLE_SEPARATOR,
  ATK_ROLE_SLIDER,
  ATK_ROLE_SPLIT_PANE,
  ATK_ROLE_SPIN_BUTTON,
  ATK_ROLE_STATUSBAR,
  ATK_ROLE_TABLE,
  ATK_ROLE_TABLE_CELL,
  ATK_ROLE_TABLE_COLUMN_HEADER,
  ATK_ROLE_TABLE_ROW_HEADER,
  ATK_ROLE_TEAR_OFF_MENU_ITEM,
  ATK_ROLE_TERMINAL,
  ATK_ROLE_TEXT,
  ATK_ROLE_TOGGLE_BUTTON,
  ATK_ROLE_TOOL_BAR,
  ATK_ROLE_TOOL_TIP,
  ATK_ROLE_TREE,
  ATK_ROLE_TREE_TABLE,
  ATK_ROLE_UNKNOWN,
  ATK_ROLE_VIEWPORT,
  ATK_ROLE_WINDOW,
  ATK_ROLE_HEADER,
  ATK_ROLE_FOOTER,
  ATK_ROLE_PARAGRAPH,
  ATK_ROLE_RULER,
  ATK_ROLE_APPLICATION,
  ATK_ROLE_AUTOCOMPLETE,
  ATK_ROLE_EDITBAR,
  ATK_ROLE_EMBEDDED,
  ATK_ROLE_ENTRY,
  ATK_ROLE_CHART,
  ATK_ROLE_CAPTION,
  ATK_ROLE_DOCUMENT_FRAME,
  ATK_ROLE_HEADING,
  ATK_ROLE_PAGE,
  ATK_ROLE_SECTION,
  ATK_ROLE_REDUNDANT_OBJECT,
  ATK_ROLE_LAST_DEFINED
} AtkRole;

AtkRole                  atk_role_register        (const gchar *name);

/**
 *AtkLayer:
 *@ATK_LAYER_INVALID: The object does not have a layer
 *@ATK_LAYER_BACKGROUND: This layer is reserved for the desktop background
 *@ATK_LAYER_CANVAS: This layer is used for Canvas components
 *@ATK_LAYER_WIDGET: This layer is normally used for components
 *@ATK_LAYER_MDI: This layer is used for layered components
 *@ATK_LAYER_POPUP: This layer is used for popup components, such as menus
 *@ATK_LAYER_OVERLAY: This layer is reserved for future use.
 *@ATK_LAYER_WINDOW: This layer is used for toplevel windows.
 *
 * Describes the layer of a component
 *
 * These enumerated "layer values" are used when determining which UI
 * rendering layer a component is drawn into, which can help in making
 * determinations of when components occlude one another.
 **/
typedef enum
{
  ATK_LAYER_INVALID,
  ATK_LAYER_BACKGROUND,
  ATK_LAYER_CANVAS,
  ATK_LAYER_WIDGET,
  ATK_LAYER_MDI,
  ATK_LAYER_POPUP,
  ATK_LAYER_OVERLAY,
  ATK_LAYER_WINDOW
} AtkLayer;

/**
 * AtkAttributeSet:
 *
 * This is a singly-linked list (a #GSList) of #AtkAttribute. It is
 * used by atk_text_get_run_attributes(), atk_text_get_default_attributes()
 * and atk_editable_text_set_run_attributes()
 **/
typedef GSList AtkAttributeSet;

/**
 * AtkAttribute:
 * @name: The attribute name. Call atk_text_attr_get_name()
 * @value: the value of the attribute, represented as a string. 
 * Call atk_text_attr_get_value() for those which are strings.
 * For values which are numbers, the string representation of the number 
 * is in value.
 *
 * A string name/value pair representing a text attribute. 
 **/
typedef struct _AtkAttribute AtkAttribute;

struct _AtkAttribute {
  gchar* name;
  gchar* value;
};

#define ATK_TYPE_OBJECT                           (atk_object_get_type ())
#define ATK_OBJECT(obj)                           (G_TYPE_CHECK_INSTANCE_CAST ((obj), ATK_TYPE_OBJECT, AtkObject))
#define ATK_OBJECT_CLASS(klass)                   (G_TYPE_CHECK_CLASS_CAST ((klass), ATK_TYPE_OBJECT, AtkObjectClass))
#define ATK_IS_OBJECT(obj)                        (G_TYPE_CHECK_INSTANCE_TYPE ((obj), ATK_TYPE_OBJECT))
#define ATK_IS_OBJECT_CLASS(klass)                (G_TYPE_CHECK_CLASS_TYPE ((klass), ATK_TYPE_OBJECT))
#define ATK_OBJECT_GET_CLASS(obj)                 (G_TYPE_INSTANCE_GET_CLASS ((obj), ATK_TYPE_OBJECT, AtkObjectClass))

#define ATK_TYPE_IMPLEMENTOR                      (atk_implementor_get_type ())
#define ATK_IS_IMPLEMENTOR(obj)                   G_TYPE_CHECK_INSTANCE_TYPE ((obj), ATK_TYPE_IMPLEMENTOR)
#define ATK_IMPLEMENTOR(obj)                      G_TYPE_CHECK_INSTANCE_CAST ((obj), ATK_TYPE_IMPLEMENTOR, AtkImplementor)
#define ATK_IMPLEMENTOR_GET_IFACE(obj)            (G_TYPE_INSTANCE_GET_INTERFACE ((obj), ATK_TYPE_IMPLEMENTOR, AtkImplementorIface))


typedef struct _AtkImplementor            AtkImplementor; /* dummy typedef */
typedef struct _AtkImplementorIface       AtkImplementorIface;


typedef struct _AtkObject                 AtkObject;
typedef struct _AtkObjectClass            AtkObjectClass;
typedef struct _AtkRelationSet            AtkRelationSet;
typedef struct _AtkStateSet               AtkStateSet;

/**
 * AtkPropertyValues:
 * @property_name: The name of the ATK property which is being presented or which has been changed.
 * @old_value: The old property value, NULL; in some contexts this value is undefined (see note below).
 * @new_value: The new value of the named property.
 *
 * @note: For most properties the old_value field of AtkPropertyValues will
 * not contain a valid value.
 *
 * Currently, the only property for which old_value is used is
 * accessible-state; for instance if there is a focus state the
 * property change handler will be called for the object which lost the focus
 * with the old_value containing an AtkState value corresponding to focused
 * and the property change handler will be called for the object which
 * received the focus with the new_value containing an AtkState value
 * corresponding to focused.
 *
 **/
00323 struct _AtkPropertyValues
{
  const gchar  *property_name;
  GValue old_value;
  GValue new_value;
};

typedef struct _AtkPropertyValues        AtkPropertyValues;

typedef gboolean (*AtkFunction)          (gpointer data); 
/*
 * For most properties the old_value field of AtkPropertyValues will
 * not contain a valid value.
 *
 * Currently, the only property for which old_value is used is
 * accessible-state; for instance if there is a focus state the
 * property change handler will be called for the object which lost the focus
 * with the old_value containing an AtkState value corresponding to focused
 * and the property change handler will be called for the object which
 * received the focus with the new_value containing an AtkState value
 * corresponding to focused.
 */
typedef void (*AtkPropertyChangeHandler) (AtkObject*, AtkPropertyValues*);


struct _AtkObject
{
  GObject parent;

  gchar *description;
  gchar *name;
  AtkObject *accessible_parent;
  AtkRole role;
  AtkRelationSet *relation_set;
  AtkLayer layer;
};

struct _AtkObjectClass
{
  GObjectClass parent;

  /*
   * Gets the accessible name of the object
   */
  G_CONST_RETURN gchar*    (* get_name)            (AtkObject                *accessible);
  /*
   * Gets the accessible description of the object
   */
  G_CONST_RETURN gchar*    (* get_description)     (AtkObject                *accessible);
  /*
   * Gets the accessible parent of the object
   */
  AtkObject*               (*get_parent)           (AtkObject                *accessible);

  /*
   * Gets the number of accessible children of the object
   */
  gint                    (* get_n_children)       (AtkObject                *accessible);
  /*
   * Returns a reference to the specified accessible child of the object.
   * The accessible children are 0-based so the first accessible child is
   * at index 0, the second at index 1 and so on.
   */
  AtkObject*              (* ref_child)            (AtkObject                *accessible,
                                                    gint                      i);
  /*
   * Gets the 0-based index of this object in its parent; returns -1 if the
   * object does not have an accessible parent.
   */
  gint                    (* get_index_in_parent) (AtkObject                 *accessible);
  /*
   * Gets the RelationSet associated with the object
   */
  AtkRelationSet*         (* ref_relation_set)    (AtkObject                 *accessible);
  /*
   * Gets the role of the object
   */
  AtkRole                 (* get_role)            (AtkObject                 *accessible);
  AtkLayer                (* get_layer)           (AtkObject                 *accessible);
  gint                    (* get_mdi_zorder)      (AtkObject                 *accessible);
  /*
   * Gets the state set of the object
   */
  AtkStateSet*            (* ref_state_set)       (AtkObject                 *accessible);
  /*
   * Sets the accessible name of the object
   */
  void                    (* set_name)            (AtkObject                 *accessible,
                                                   const gchar               *name);
  /*
   * Sets the accessible description of the object
   */
  void                    (* set_description)     (AtkObject                 *accessible,
                                                   const gchar               *description);
  /*
   * Sets the accessible parent of the object
   */
  void                    (* set_parent)          (AtkObject                 *accessible,
                                                   AtkObject                 *parent);
  /*
   * Sets the accessible role of the object
   */
  void                    (* set_role)            (AtkObject                 *accessible,
                                                   AtkRole                   role);
  /*
   * Specifies a function to be called when a property changes value
   */
guint                     (* connect_property_change_handler)    (AtkObject
                 *accessible,
                                                                  AtkPropertyChangeHandler       *handler);
  /*
   * Removes a property change handler which was specified using
   * connect_property_change_handler
   */
void                      (* remove_property_change_handler)     (AtkObject
                *accessible,
                                                                  guint
                handler_id);
void                      (* initialize)                         (AtkObject                     *accessible,
                                                                  gpointer                      data);
  /*
   * The signal handler which is executed when there is a change in the
   * children of the object
   */
  void                    (* children_changed)    (AtkObject                  *accessible,
                                                   guint                      change_index,
                                                   gpointer                   changed_child);
  /*
   * The signal handler which is executed  when there is a focus event
   * for an object.
   */
  void                    (* focus_event)         (AtkObject                  *accessible,
                                                   gboolean                   focus_in);
  /*
   * The signal handler which is executed  when there is a property_change 
   * signal for an object.
   */
  void                    (* property_change)     (AtkObject                  *accessible,
                                                   AtkPropertyValues          *values);
  /*
   * The signal handler which is executed  when there is a state_change 
   * signal for an object.
   */
  void                    (* state_change)        (AtkObject                  *accessible,
                                                   const gchar                *name,
                                                   gboolean                   state_set);
  /*
   * The signal handler which is executed when there is a change in the
   * visible data for an object
   */
  void                    (*visible_data_changed) (AtkObject                  *accessible);

  /*
   * The signal handler which is executed when there is a change in the
   * 'active' child or children of the object, for instance when 
   * interior focus changes in a table or list.  This signal should be emitted
   * by objects whose state includes ATK_STATE_MANAGES_DESCENDANTS.
   */
  void                    (*active_descendant_changed) (AtkObject                  *accessible,
                                                        gpointer                   *child);

  /*        
   * Gets a list of properties applied to this object as a whole, as an #AtkAttributeSet consisting of name-value pairs. 
   * @since ATK 1.12
   */
  AtkAttributeSet*        (*get_attributes)            (AtkObject                  *accessible);
  AtkFunction             pad1;
  AtkFunction             pad2;
};

GType            atk_object_get_type   (void);

struct _AtkImplementorIface
{
  GTypeInterface parent;

  AtkObject*   (*ref_accessible) (AtkImplementor *implementor);
};
GType atk_implementor_get_type (void);

/*
 * This method uses the ref_accessible method in AtkImplementorIface,
 * if the object's class implements AtkImplementorIface.
 * Otherwise it returns %NULL.
 *
 * IMPORTANT:
 * Note also that because this method may return flyweight objects,
 * it increments the returned AtkObject's reference count.
 * Therefore it is the responsibility of the calling
 * program to unreference the object when no longer needed.
 * (c.f. gtk_widget_get_accessible() where this is not the case).
 */
AtkObject*              atk_implementor_ref_accessible            (AtkImplementor *implementor);

/*
 * Properties directly supported by AtkObject
 */

G_CONST_RETURN gchar*   atk_object_get_name                       (AtkObject *accessible);
G_CONST_RETURN gchar*   atk_object_get_description                (AtkObject *accessible);
AtkObject*              atk_object_get_parent                     (AtkObject *accessible);
gint                    atk_object_get_n_accessible_children      (AtkObject *accessible);
AtkObject*              atk_object_ref_accessible_child           (AtkObject *accessible,
                                                                   gint        i);
AtkRelationSet*         atk_object_ref_relation_set               (AtkObject *accessible);
AtkRole                 atk_object_get_role                       (AtkObject *accessible);
AtkLayer                atk_object_get_layer                      (AtkObject *accessible);
gint                    atk_object_get_mdi_zorder                 (AtkObject *accessible);
AtkAttributeSet*        atk_object_get_attributes                 (AtkObject *accessible);
AtkStateSet*            atk_object_ref_state_set                  (AtkObject *accessible);
gint                    atk_object_get_index_in_parent            (AtkObject *accessible);
void                    atk_object_set_name                       (AtkObject *accessible,
                                                                   const gchar *name);
void                    atk_object_set_description                (AtkObject *accessible,
                                                                   const gchar *description);
void                    atk_object_set_parent                     (AtkObject *accessible,
                                                                   AtkObject *parent);
void                    atk_object_set_role                       (AtkObject *accessible,
                                                                   AtkRole   role);


guint                atk_object_connect_property_change_handler  (AtkObject                      *accessible,
                                                                  AtkPropertyChangeHandler       *handler);
void                 atk_object_remove_property_change_handler   (AtkObject                      *accessible,
                                                                  guint                          handler_id);

void                 atk_object_notify_state_change              (AtkObject                      *accessible,
                                                                  AtkState                       state,
                                                                  gboolean                       value);
void                 atk_object_initialize                       (AtkObject                     *accessible,
                                                                  gpointer                      data);
                                    
G_CONST_RETURN gchar* atk_role_get_name      (AtkRole         role);
AtkRole               atk_role_for_name      (const gchar     *name);


/* NEW in 1.1: convenience API */
gboolean              atk_object_add_relationship              (AtkObject      *object,
                                                AtkRelationType relationship,
                                                AtkObject      *target);
gboolean              atk_object_remove_relationship           (AtkObject      *object,
                                                AtkRelationType relationship,
                                                AtkObject      *target);
G_CONST_RETURN gchar* atk_role_get_localized_name              (AtkRole     role);

/* */


/*
 * Note: the properties which are registered with the GType
 *   property registry, for type ATK_TYPE_OBJECT, are as follows:
 *
 *   "accessible-name"
 *   "accessible-description"
 *   "accessible-parent"
 *   "accessible-role"
 *   "accessible-value"
 *   "accessible-component-layer"
 *   "accessible-component-zorder"
 *   "accessible-table-caption"
 *   "accessible-table-column-description"
 *   "accessible-table-column-header"
 *   "accessible-table-row-description"
 *   "accessible-table-row-header"
 *   "accessible-table-summary"
 *   "accessible-model"
 *
 * accessibility property change listeners should use the
 *   normal GObject property interfaces and "property-change"
 *   signal handler semantics to interpret the property change
 *   information relayed from AtkObject.
 *   (AtkObject instances will connect to the "notify"
 *   signal in their host objects, and relay the signals when appropriate).
 */

/* For other signals, see related interfaces
 *
 *    AtkActionIface,
 *    AtkComponentIface,
 *    AtkHypertextIface,
 *    AtkImageIface,
 *    AtkSelectionIface,
 *    AtkTableIface,
 *    AtkTextIface,
 *    AtkValueIface.
 *
 *  The usage model for obtaining these interface instances is:
 *    ATK_<interfacename>_GET_IFACE(GObject *accessible),
 *    where accessible, though specified as a GObject, is
 *    the AtkObject instance being queried.
 *  More usually, the interface will be used via a cast to the
 *    interface's corresponding "type":
 *
 *    AtkText textImpl = ATK_TEXT(accessible);
 *    if (textImpl)
 *      {
 *        cpos = atk_text_get_caret_position(textImpl);
 *      }
 *
 *  If it's known in advance that accessible implements AtkTextIface,
 *    this is shortened to:
 *
 *    cpos = atk_text_get_caret_position (ATK_TEXT (accessible));
 */

#ifdef __cplusplus
}
#endif /* __cplusplus */


#endif /* __ATK_OBJECT_H__ */

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