atk/atkobject.h

   1 /* ATK -  Accessibility Toolkit
   2  * Copyright 2001 Sun Microsystems Inc.
   3  *
   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.
   8  *
   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.
  13  *
  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.
  18  */
  19
  20 #if defined(ATK_DISABLE_SINGLE_INCLUDES) && !defined (__ATK_H_INSIDE__) && !defined (ATK_COMPILATION)
  21 #error "Only <atk/atk.h> can be included directly."
  22 #endif
  23
  24 #ifndef __ATK_OBJECT_H__
  25 #define __ATK_OBJECT_H__
  26
  27 #include <glib-object.h>
  28 #include <atk/atkstate.h>
  29 #include <atk/atkrelationtype.h>
  30
  31 G_BEGIN_DECLS
  32
  33 /*
  34  * AtkObject represents the minimum information all accessible objects
  35  * return. This information includes accessible name, accessible
  36  * description, role and state of the object, as well information about
  37  * its parent and children. It is also possible to obtain more specific
  38  * accessibility information about a component if it supports one or more
  39  * of the following interfaces:
  40  */
  41
  42
  43 /**
  44  *AtkRole:
  45  *@ATK_ROLE_INVALID: Invalid role
  46  *@ATK_ROLE_ACCEL_LABEL: A label which represents an accelerator
  47  *@ATK_ROLE_ALERT: An object which is an alert to the user. Assistive Technologies typically respond to ATK_ROLE_ALERT by reading the entire onscreen contents of containers advertising this role.  Should be used for warning dialogs, etc.
  48  *@ATK_ROLE_ANIMATION: An object which is an animated image
  49  *@ATK_ROLE_ARROW: An arrow in one of the four cardinal directions
  50  *@ATK_ROLE_CALENDAR:  An object that displays a calendar and allows the user to select a date
  51  *@ATK_ROLE_CANVAS: An object that can be drawn into and is used to trap events
  52  *@ATK_ROLE_CHECK_BOX: A choice that can be checked or unchecked and provides a separate indicator for the current state
  53  *@ATK_ROLE_CHECK_MENU_ITEM: A menu item with a check box
  54  *@ATK_ROLE_COLOR_CHOOSER: A specialized dialog that lets the user choose a color
  55  *@ATK_ROLE_COLUMN_HEADER: The header for a column of data
  56  *@ATK_ROLE_COMBO_BOX: A collapsible list of choices the user can select from
  57  *@ATK_ROLE_DATE_EDITOR: An object whose purpose is to allow a user to edit a date
  58  *@ATK_ROLE_DESKTOP_ICON: An inconifed internal frame within a DESKTOP_PANE
  59  *@ATK_ROLE_DESKTOP_FRAME: A pane that supports internal frames and iconified versions of those internal frames
  60  *@ATK_ROLE_DIAL: An object whose purpose is to allow a user to set a value
  61  *@ATK_ROLE_DIALOG: A top level window with title bar and a border
  62  *@ATK_ROLE_DIRECTORY_PANE: A pane that allows the user to navigate through and select the contents of a directory
  63  *@ATK_ROLE_DRAWING_AREA: An object used for drawing custom user interface elements
  64  *@ATK_ROLE_FILE_CHOOSER: A specialized dialog that lets the user choose a file
  65  *@ATK_ROLE_FILLER: A object that fills up space in a user interface
  66  *@ATK_ROLE_FONT_CHOOSER: A specialized dialog that lets the user choose a font
  67  *@ATK_ROLE_FRAME: A top level window with a title bar, border, menubar, etc.
  68  *@ATK_ROLE_GLASS_PANE: A pane that is guaranteed to be painted on top of all panes beneath it
  69  *@ATK_ROLE_HTML_CONTAINER: A document container for HTML, whose children represent the document content
  70  *@ATK_ROLE_ICON: A small fixed size picture, typically used to decorate components
  71  *@ATK_ROLE_IMAGE: An object whose primary purpose is to display an image
  72  *@ATK_ROLE_INTERNAL_FRAME: A frame-like object that is clipped by a desktop pane
  73  *@ATK_ROLE_LABEL: An object used to present an icon or short string in an interface
  74  *@ATK_ROLE_LAYERED_PANE: A specialized pane that allows its children to be drawn in layers, providing a form of stacking order
  75  *@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
  76  *@ATK_ROLE_LIST_ITEM: An object that represents an element of a list
  77  *@ATK_ROLE_MENU: An object usually found inside a menu bar that contains a list of actions the user can choose from
  78  *@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
  79  *@ATK_ROLE_MENU_ITEM: An object usually contained in a menu that presents an action the user can choose
  80  *@ATK_ROLE_OPTION_PANE: A specialized pane whose primary use is inside a DIALOG
  81  *@ATK_ROLE_PAGE_TAB: An object that is a child of a page tab list
  82  *@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
  83  *@ATK_ROLE_PANEL: A generic container that is often used to group objects
  84  *@ATK_ROLE_PASSWORD_TEXT: A text object uses for passwords, or other places where the text content is not shown visibly to the user
  85  *@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
  86  *@ATK_ROLE_PROGRESS_BAR: An object used to indicate how much of a task has been completed
  87  *@ATK_ROLE_PUSH_BUTTON: An object the user can manipulate to tell the application to do something
  88  *@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
  89  *@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
  90  *@ATK_ROLE_ROOT_PANE: A specialized pane that has a glass pane and a layered pane as its children
  91  *@ATK_ROLE_ROW_HEADER: The header for a row of data
  92  *@ATK_ROLE_SCROLL_BAR: An object usually used to allow a user to incrementally view a large amount of data.
  93  *@ATK_ROLE_SCROLL_PANE: An object that allows a user to incrementally view a large amount of information
  94  *@ATK_ROLE_SEPARATOR: An object usually contained in a menu to provide a visible and logical separation of the contents in a menu
  95  *@ATK_ROLE_SLIDER: An object that allows the user to select from a bounded range
  96  *@ATK_ROLE_SPLIT_PANE: A specialized panel that presents two other panels at the same time
  97  *@ATK_ROLE_SPIN_BUTTON: An object used to get an integer or floating point number from the user
  98  *@ATK_ROLE_STATUSBAR: An object which reports messages of minor importance to the user
  99  *@ATK_ROLE_TABLE: An object used to represent information in terms of rows and columns
 100  *@ATK_ROLE_TABLE_CELL: A cell in a table
 101  *@ATK_ROLE_TABLE_COLUMN_HEADER: The header for a column of a table
 102  *@ATK_ROLE_TABLE_ROW_HEADER: The header for a row of a table
 103  *@ATK_ROLE_TEAR_OFF_MENU_ITEM: A menu item used to tear off and reattach its menu
 104  *@ATK_ROLE_TERMINAL: An object that represents an accessible terminal.  @Since: ATK-0.6
 105  *@ATK_ROLE_TEXT: An object that presents text to the user
 106  *@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
 107  *@ATK_ROLE_TOOL_BAR: A bar or palette usually composed of push buttons or toggle buttons
 108  *@ATK_ROLE_TOOL_TIP: An object that provides information about another object
 109  *@ATK_ROLE_TREE: An object used to represent hierarchical information to the user
 110  *@ATK_ROLE_TREE_TABLE: An object capable of expanding and collapsing rows as well as showing multiple columns of data.   @Since: ATK-0.7
 111  *@ATK_ROLE_UNKNOWN: The object contains some Accessible information, but its role is not known
 112  *@ATK_ROLE_VIEWPORT: An object usually used in a scroll pane
 113  *@ATK_ROLE_WINDOW: A top level window with no title or border.
 114  *@ATK_ROLE_HEADER: An object that serves as a document header. @Since: ATK-1.1.1
 115  *@ATK_ROLE_FOOTER: An object that serves as a document footer.  @Since: ATK-1.1.1
 116  *@ATK_ROLE_PARAGRAPH: An object which is contains a paragraph of text content.   @Since: ATK-1.1.1
 117  *@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).   @Since: ATK-1.1.1
 118  *@ATK_ROLE_APPLICATION: The object is an application object, which may contain @ATK_ROLE_FRAME objects or other types of accessibles.  The root accessible of any application's ATK hierarchy should have ATK_ROLE_APPLICATION.   @Since: ATK-1.1.4
 119  *@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.   @Since: ATK-1.3
 120  *@ATK_ROLE_EDITBAR: The object is an editable text object in a toolbar.  @Since: ATK-1.5
 121  *@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.  @Since: ATK-1.7.2
 122  *@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.   @Since: ATK-1.11
 123  *@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.  @Since: ATK-1.11
 124  *@ATK_ROLE_CAPTION: The object contains descriptive information, usually textual, about another user interface element such as a table, chart, or image.  @Since: ATK-1.11
 125  *@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.  @Since: ATK-1.11
 126  *@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.
 127  *@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.  @Since: ATK-1.11
 128  *@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. @Since: ATK-1.11
 129  *@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. @Since: ATK-1.11
 130  *@ATK_ROLE_FORM: The object is a container for form controls, for instance as part of a
 131  * web form or user-input form within a document.  This role is primarily a tag/convenience for
 132  * clients when navigating complex documents, it is not expected that ordinary GUI containers will
 133  * always have ATK_ROLE_FORM. @Since: ATK-1.12.0
 134  *@ATK_ROLE_LINK: The object is a hypertext anchor, i.e. a "link" in a
 135  * hypertext document.  Such objects are distinct from 'inline'
 136  * content which may also use the Hypertext/Hyperlink interfaces
 137  * to indicate the range/location within a text object where
 138  * an inline or embedded object lies.  @Since: ATK-1.12.1
 139  *@ATK_ROLE_INPUT_METHOD_WINDOW: The object is a window or similar viewport
 140  * which is used to allow composition or input of a 'complex character',
 141  * in other words it is an "input method window." @Since: ATK-1.12.1
 142  *@ATK_ROLE_TABLE_ROW: A row in a table.  @Since: ATK-2.1.0
 143  *@ATK_ROLE_TREE_ITEM: An object that represents an element of a tree.  @Since: ATK-2.1.0
 144  *@ATK_ROLE_DOCUMENT_SPREADSHEET: A document frame which contains a spreadsheet.  @Since: ATK-2.1.0
 145  *@ATK_ROLE_DOCUMENT_PRESENTATION: A document frame which contains a presentation or slide content.  @Since: ATK-2.1.0
 146  *@ATK_ROLE_DOCUMENT_TEXT: A document frame which contains textual content, such as found in a word processing application.  @Since: ATK-2.1.0
 147  *@ATK_ROLE_DOCUMENT_WEB: A document frame which contains HTML or other markup suitable for display in a web browser.  @Since: ATK-2.1.0
 148  *@ATK_ROLE_DOCUMENT_EMAIL: A document frame which contains email content to be displayed or composed either in plain text or HTML.  @Since: ATK-2.1.0
 149  *@ATK_ROLE_COMMENT: An object found within a document and designed to present a comment, note, or other annotation. In some cases, this object might not be visible until activated.  @Since: ATK-2.1.0
 150  *@ATK_ROLE_LIST_BOX: A non-collapsible list of choices the user can select from. @Since: ATK-2.1.0
 151  *@ATK_ROLE_GROUPING: A group of related widgets. This group typically has a label. @Since: ATK-2.1.0
 152  *@ATK_ROLE_IMAGE_MAP: An image map object. Usually a graphic with multiple hotspots, where each hotspot can be activated resulting in the loading of another document or section of a document. @Since: ATK-2.1.0
 153  *@ATK_ROLE_NOTIFICATION: A transitory object designed to present a message to the user, typically at the desktop level rather than inside a particular application.  @Since: ATK-2.1.0
 154  *@ATK_ROLE_INFO_BAR: An object designed to present a message to the user within an existing window. @Since: ATK-2.1.0
 155  *@ATK_ROLE_LEVEL_BAR: A bar that serves as a level indicator to, for instance, show the strength of a password or the state of a battery.  @Since: ATK-2.7.3
 156  *@ATK_ROLE_LAST_DEFINED: not a valid role, used for finding end of the enumeration
 157  *
 158  * Describes the role of an object
 159  *
 160  * These are the built-in enumerated roles that UI components can have in
 161  * ATK.  Other roles may be added at runtime, so an AtkRole >=
 162  * ATK_ROLE_LAST_DEFINED is not necessarily an error.
 163  **/
 164 typedef enum
 165 {
 166   ATK_ROLE_INVALID = 0,
 167   ATK_ROLE_ACCEL_LABEL,
 168   ATK_ROLE_ALERT,
 169   ATK_ROLE_ANIMATION,
 170   ATK_ROLE_ARROW,
 171   ATK_ROLE_CALENDAR,
 172   ATK_ROLE_CANVAS,
 173   ATK_ROLE_CHECK_BOX,
 174   ATK_ROLE_CHECK_MENU_ITEM,
 175   ATK_ROLE_COLOR_CHOOSER,
 176   ATK_ROLE_COLUMN_HEADER,
 177   ATK_ROLE_COMBO_BOX,
 178   ATK_ROLE_DATE_EDITOR,
 179   ATK_ROLE_DESKTOP_ICON,
 180   ATK_ROLE_DESKTOP_FRAME,
 181   ATK_ROLE_DIAL,
 182   ATK_ROLE_DIALOG,
 183   ATK_ROLE_DIRECTORY_PANE,
 184   ATK_ROLE_DRAWING_AREA,
 185   ATK_ROLE_FILE_CHOOSER,
 186   ATK_ROLE_FILLER,
 187   ATK_ROLE_FONT_CHOOSER,
 188   ATK_ROLE_FRAME,
 189   ATK_ROLE_GLASS_PANE,
 190   ATK_ROLE_HTML_CONTAINER,
 191   ATK_ROLE_ICON,
 192   ATK_ROLE_IMAGE,
 193   ATK_ROLE_INTERNAL_FRAME,
 194   ATK_ROLE_LABEL,
 195   ATK_ROLE_LAYERED_PANE,
 196   ATK_ROLE_LIST,
 197   ATK_ROLE_LIST_ITEM,
 198   ATK_ROLE_MENU,
 199   ATK_ROLE_MENU_BAR,
 200   ATK_ROLE_MENU_ITEM,
 201   ATK_ROLE_OPTION_PANE,
 202   ATK_ROLE_PAGE_TAB,
 203   ATK_ROLE_PAGE_TAB_LIST,
 204   ATK_ROLE_PANEL,
 205   ATK_ROLE_PASSWORD_TEXT,
 206   ATK_ROLE_POPUP_MENU,
 207   ATK_ROLE_PROGRESS_BAR,
 208   ATK_ROLE_PUSH_BUTTON,
 209   ATK_ROLE_RADIO_BUTTON,
 210   ATK_ROLE_RADIO_MENU_ITEM,
 211   ATK_ROLE_ROOT_PANE,
 212   ATK_ROLE_ROW_HEADER,
 213   ATK_ROLE_SCROLL_BAR,
 214   ATK_ROLE_SCROLL_PANE,
 215   ATK_ROLE_SEPARATOR,
 216   ATK_ROLE_SLIDER,
 217   ATK_ROLE_SPLIT_PANE,
 218   ATK_ROLE_SPIN_BUTTON,
 219   ATK_ROLE_STATUSBAR,
 220   ATK_ROLE_TABLE,
 221   ATK_ROLE_TABLE_CELL,
 222   ATK_ROLE_TABLE_COLUMN_HEADER,
 223   ATK_ROLE_TABLE_ROW_HEADER,
 224   ATK_ROLE_TEAR_OFF_MENU_ITEM,
 225   ATK_ROLE_TERMINAL,
 226   ATK_ROLE_TEXT,
 227   ATK_ROLE_TOGGLE_BUTTON,
 228   ATK_ROLE_TOOL_BAR,
 229   ATK_ROLE_TOOL_TIP,
 230   ATK_ROLE_TREE,
 231   ATK_ROLE_TREE_TABLE,
 232   ATK_ROLE_UNKNOWN,
 233   ATK_ROLE_VIEWPORT,
 234   ATK_ROLE_WINDOW,
 235   ATK_ROLE_HEADER,
 236   ATK_ROLE_FOOTER,
 237   ATK_ROLE_PARAGRAPH,
 238   ATK_ROLE_RULER,
 239   ATK_ROLE_APPLICATION,
 240   ATK_ROLE_AUTOCOMPLETE,
 241   ATK_ROLE_EDITBAR,
 242   ATK_ROLE_EMBEDDED,
 243   ATK_ROLE_ENTRY,
 244   ATK_ROLE_CHART,
 245   ATK_ROLE_CAPTION,
 246   ATK_ROLE_DOCUMENT_FRAME,
 247   ATK_ROLE_HEADING,
 248   ATK_ROLE_PAGE,
 249   ATK_ROLE_SECTION,
 250   ATK_ROLE_REDUNDANT_OBJECT,
 251   ATK_ROLE_FORM,
 252   ATK_ROLE_LINK,
 253   ATK_ROLE_INPUT_METHOD_WINDOW,
 254   ATK_ROLE_TABLE_ROW,
 255   ATK_ROLE_TREE_ITEM,
 256   ATK_ROLE_DOCUMENT_SPREADSHEET,
 257   ATK_ROLE_DOCUMENT_PRESENTATION,
 258   ATK_ROLE_DOCUMENT_TEXT,
 259   ATK_ROLE_DOCUMENT_WEB,
 260   ATK_ROLE_DOCUMENT_EMAIL,
 261   ATK_ROLE_COMMENT,
 262   ATK_ROLE_LIST_BOX,
 263   ATK_ROLE_GROUPING,
 264   ATK_ROLE_IMAGE_MAP,
 265   ATK_ROLE_NOTIFICATION,
 266   ATK_ROLE_INFO_BAR,
 267   ATK_ROLE_LEVEL_BAR,
 268   ATK_ROLE_LAST_DEFINED
 269 } AtkRole;
 270
 271 AtkRole                  atk_role_register        (const gchar *name);
 272
 273 /**
 274  *AtkLayer:
 275  *@ATK_LAYER_INVALID: The object does not have a layer
 276  *@ATK_LAYER_BACKGROUND: This layer is reserved for the desktop background
 277  *@ATK_LAYER_CANVAS: This layer is used for Canvas components
 278  *@ATK_LAYER_WIDGET: This layer is normally used for components
 279  *@ATK_LAYER_MDI: This layer is used for layered components
 280  *@ATK_LAYER_POPUP: This layer is used for popup components, such as menus
 281  *@ATK_LAYER_OVERLAY: This layer is reserved for future use.
 282  *@ATK_LAYER_WINDOW: This layer is used for toplevel windows.
 283  *
 284  * Describes the layer of a component
 285  *
 286  * These enumerated "layer values" are used when determining which UI
 287  * rendering layer a component is drawn into, which can help in making
 288  * determinations of when components occlude one another.
 289  **/
 290 typedef enum
 291 {
 292   ATK_LAYER_INVALID,
 293   ATK_LAYER_BACKGROUND,
 294   ATK_LAYER_CANVAS,
 295   ATK_LAYER_WIDGET,
 296   ATK_LAYER_MDI,
 297   ATK_LAYER_POPUP,
 298   ATK_LAYER_OVERLAY,
 299   ATK_LAYER_WINDOW
 300 } AtkLayer;
 301
 302 /**
 303  * AtkAttributeSet:
 304  *
 305  * This is a singly-linked list (a #GSList) of #AtkAttribute. It is
 306  * used by atk_text_get_run_attributes(), atk_text_get_default_attributes()
 307  * and atk_editable_text_set_run_attributes()
 308  **/
 309 typedef GSList AtkAttributeSet;
 310
 311 /**
 312  * AtkAttribute:
 313  * @name: The attribute name. Call atk_text_attr_get_name()
 314  * @value: the value of the attribute, represented as a string.
 315  * Call atk_text_attr_get_value() for those which are strings.
 316  * For values which are numbers, the string representation of the number
 317  * is in value.
 318  *
 319  * A string name/value pair representing a text attribute.
 320  **/
 321 typedef struct _AtkAttribute AtkAttribute;
 322
 323 struct _AtkAttribute {
 324   gchar* name;
 325   gchar* value;
 326 };
 327
 328 #define ATK_TYPE_OBJECT                           (atk_object_get_type ())
 329 #define ATK_OBJECT(obj)                           (G_TYPE_CHECK_INSTANCE_CAST ((obj), ATK_TYPE_OBJECT, AtkObject))
 330 #define ATK_OBJECT_CLASS(klass)                   (G_TYPE_CHECK_CLASS_CAST ((klass), ATK_TYPE_OBJECT, AtkObjectClass))
 331 #define ATK_IS_OBJECT(obj)                        (G_TYPE_CHECK_INSTANCE_TYPE ((obj), ATK_TYPE_OBJECT))
 332 #define ATK_IS_OBJECT_CLASS(klass)                (G_TYPE_CHECK_CLASS_TYPE ((klass), ATK_TYPE_OBJECT))
 333 #define ATK_OBJECT_GET_CLASS(obj)                 (G_TYPE_INSTANCE_GET_CLASS ((obj), ATK_TYPE_OBJECT, AtkObjectClass))
 334
 335 #define ATK_TYPE_IMPLEMENTOR                      (atk_implementor_get_type ())
 336 #define ATK_IS_IMPLEMENTOR(obj)                   G_TYPE_CHECK_INSTANCE_TYPE ((obj), ATK_TYPE_IMPLEMENTOR)
 337 #define ATK_IMPLEMENTOR(obj)                      G_TYPE_CHECK_INSTANCE_CAST ((obj), ATK_TYPE_IMPLEMENTOR, AtkImplementor)
 338 #define ATK_IMPLEMENTOR_GET_IFACE(obj)            (G_TYPE_INSTANCE_GET_INTERFACE ((obj), ATK_TYPE_IMPLEMENTOR, AtkImplementorIface))
 339
 340
 341 typedef struct _AtkImplementor            AtkImplementor; /* dummy typedef */
 342 typedef struct _AtkImplementorIface       AtkImplementorIface;
 343
 344
 345 typedef struct _AtkObject                 AtkObject;
 346 typedef struct _AtkObjectClass            AtkObjectClass;
 347 typedef struct _AtkRelationSet            AtkRelationSet;
 348 typedef struct _AtkStateSet               AtkStateSet;
 349
 350 /**
 351  * AtkPropertyValues:
 352  * @property_name: The name of the ATK property which is being presented or which has been changed.
 353  * @old_value: The old property value, NULL; in some contexts this value is undefined (see note below).
 354  * @new_value: The new value of the named property.
 355  *
 356  * Note: for most properties the old_value field of #AtkPropertyValues
 357  * will not contain a valid value.
 358  *
 359  * Currently, the only property for which old_value is used is
 360  * accessible-state; for instance if there is a focus state the
 361  * property change handler will be called for the object which lost the focus
 362  * with the old_value containing an #AtkState value corresponding to focused
 363  * and the property change handler will be called for the object which
 364  * received the focus with the new_value containing an #AtkState value
 365  * corresponding to focused.
 366  *
 367  **/
 368 struct _AtkPropertyValues
 369 {
 370   const gchar  *property_name;
 371   GValue old_value;
 372   GValue new_value;
 373 };
 374
 375 typedef struct _AtkPropertyValues        AtkPropertyValues;
 376
 377 typedef gboolean (*AtkFunction)          (gpointer user_data);
 378 /*
 379  * For most properties the old_value field of AtkPropertyValues will
 380  * not contain a valid value.
 381  *
 382  * Currently, the only property for which old_value is used is
 383  * accessible-state; for instance if there is a focus state the
 384  * property change handler will be called for the object which lost the focus
 385  * with the old_value containing an AtkState value corresponding to focused
 386  * and the property change handler will be called for the object which
 387  * received the focus with the new_value containing an AtkState value
 388  * corresponding to focused.
 389  */
 390 typedef void (*AtkPropertyChangeHandler) (AtkObject* obj, AtkPropertyValues* vals);
 391
 392
 393 struct _AtkObject
 394 {
 395   GObject parent;
 396
 397   gchar *description;
 398   gchar *name;
 399   AtkObject *accessible_parent;
 400   AtkRole role;
 401   AtkRelationSet *relation_set;
 402   AtkLayer layer;
 403 };
 404
 405 struct _AtkObjectClass
 406 {
 407   GObjectClass parent;
 408
 409   /*
 410    * Gets the accessible name of the object
 411    */
 412   const gchar*             (* get_name)            (AtkObject                *accessible);
 413   /*
 414    * Gets the accessible description of the object
 415    */
 416   const gchar*             (* get_description)     (AtkObject                *accessible);
 417   /*
 418    * Gets the accessible parent of the object
 419    */
 420   AtkObject*               (*get_parent)           (AtkObject                *accessible);
 421
 422   /*
 423    * Gets the number of accessible children of the object
 424    */
 425   gint                    (* get_n_children)       (AtkObject                *accessible);
 426   /*
 427    * Returns a reference to the specified accessible child of the object.
 428    * The accessible children are 0-based so the first accessible child is
 429    * at index 0, the second at index 1 and so on.
 430    */
 431   AtkObject*              (* ref_child)            (AtkObject                *accessible,
 432                                                     gint                      i);
 433   /*
 434    * Gets the 0-based index of this object in its parent; returns -1 if the
 435    * object does not have an accessible parent.
 436    */
 437   gint                    (* get_index_in_parent) (AtkObject                 *accessible);
 438   /*
 439    * Gets the RelationSet associated with the object
 440    */
 441   AtkRelationSet*         (* ref_relation_set)    (AtkObject                 *accessible);
 442   /*
 443    * Gets the role of the object
 444    */
 445   AtkRole                 (* get_role)            (AtkObject                 *accessible);
 446   AtkLayer                (* get_layer)           (AtkObject                 *accessible);
 447   gint                    (* get_mdi_zorder)      (AtkObject                 *accessible);
 448   /*
 449    * Gets the state set of the object
 450    */
 451   AtkStateSet*            (* ref_state_set)       (AtkObject                 *accessible);
 452   /*
 453    * Sets the accessible name of the object
 454    */
 455   void                    (* set_name)            (AtkObject                 *accessible,
 456                                                    const gchar               *name);
 457   /*
 458    * Sets the accessible description of the object
 459    */
 460   void                    (* set_description)     (AtkObject                 *accessible,
 461                                                    const gchar               *description);
 462   /*
 463    * Sets the accessible parent of the object
 464    */
 465   void                    (* set_parent)          (AtkObject                 *accessible,
 466                                                    AtkObject                 *parent);
 467   /*
 468    * Sets the accessible role of the object
 469    */
 470   void                    (* set_role)            (AtkObject                 *accessible,
 471                                                    AtkRole                   role);
 472   /*
 473    * Specifies a function to be called when a property changes value
 474    */
 475 guint                     (* connect_property_change_handler)    (AtkObject
 476                  *accessible,
 477                                                                   AtkPropertyChangeHandler       *handler);
 478   /*
 479    * Removes a property change handler which was specified using
 480    * connect_property_change_handler
 481    */
 482 void                      (* remove_property_change_handler)     (AtkObject
 483                 *accessible,
 484                                                                   guint
 485                 handler_id);
 486 void                      (* initialize)                         (AtkObject                     *accessible,
 487                                                                   gpointer                      data);
 488   /*
 489    * The signal handler which is executed when there is a change in the
 490    * children of the object
 491    */
 492   void                    (* children_changed)    (AtkObject                  *accessible,
 493                                                    guint                      change_index,
 494                                                    gpointer                   changed_child);
 495   /*
 496    * The signal handler which is executed  when there is a focus event
 497    * for an object.
 498    */
 499   void                    (* focus_event)         (AtkObject                  *accessible,
 500                                                    gboolean                   focus_in);
 501   /*
 502    * The signal handler which is executed  when there is a property_change
 503    * signal for an object.
 504    */
 505   void                    (* property_change)     (AtkObject                  *accessible,
 506                                                    AtkPropertyValues          *values);
 507   /*
 508    * The signal handler which is executed  when there is a state_change
 509    * signal for an object.
 510    */
 511   void                    (* state_change)        (AtkObject                  *accessible,
 512                                                    const gchar                *name,
 513                                                    gboolean                   state_set);
 514   /*
 515    * The signal handler which is executed when there is a change in the
 516    * visible data for an object
 517    */
 518   void                    (*visible_data_changed) (AtkObject                  *accessible);
 519
 520   /*
 521    * The signal handler which is executed when there is a change in the
 522    * 'active' child or children of the object, for instance when
 523    * interior focus changes in a table or list.  This signal should be emitted
 524    * by objects whose state includes ATK_STATE_MANAGES_DESCENDANTS.
 525    */
 526   void                    (*active_descendant_changed) (AtkObject                  *accessible,
 527                                                         gpointer                   *child);
 528
 529   /*
 530    * Gets a list of properties applied to this object as a whole, as an #AtkAttributeSet consisting of name-value pairs.
 531    * Since ATK 1.12
 532    */
 533   AtkAttributeSet*        (*get_attributes)            (AtkObject                  *accessible);
 534
 535   const gchar*            (*get_object_locale)         (AtkObject                  *accessible);
 536
 537   AtkFunction             pad1;
 538 };
 539
 540 GType            atk_object_get_type   (void);
 541
 542 struct _AtkImplementorIface
 543 {
 544   GTypeInterface parent;
 545
 546   AtkObject*   (*ref_accessible) (AtkImplementor *implementor);
 547 };
 548 GType atk_implementor_get_type (void);
 549
 550 /*
 551  * This method uses the ref_accessible method in AtkImplementorIface,
 552  * if the object's class implements AtkImplementorIface.
 553  * Otherwise it returns %NULL.
 554  *
 555  * IMPORTANT:
 556  * Note also that because this method may return flyweight objects,
 557  * it increments the returned AtkObject's reference count.
 558  * Therefore it is the responsibility of the calling
 559  * program to unreference the object when no longer needed.
 560  * (c.f. gtk_widget_get_accessible() where this is not the case).
 561  */
 562 AtkObject*              atk_implementor_ref_accessible            (AtkImplementor *implementor);
 563
 564 /*
 565  * Properties directly supported by AtkObject
 566  */
 567
 568 const gchar*            atk_object_get_name                       (AtkObject *accessible);
 569 const gchar*            atk_object_get_description                (AtkObject *accessible);
 570 AtkObject*              atk_object_get_parent                     (AtkObject *accessible);
 571 gint                    atk_object_get_n_accessible_children      (AtkObject *accessible);
 572 AtkObject*              atk_object_ref_accessible_child           (AtkObject *accessible,
 573                                                                    gint        i);
 574 AtkRelationSet*         atk_object_ref_relation_set               (AtkObject *accessible);
 575 AtkRole                 atk_object_get_role                       (AtkObject *accessible);
 576 #ifndef ATK_DISABLE_DEPRECATED
 577 G_DEPRECATED_FOR(atk_component_get_layer)
 578 AtkLayer                atk_object_get_layer                      (AtkObject *accessible);
 579 G_DEPRECATED_FOR(atk_component_get_mdi_zorder)
 580 gint                    atk_object_get_mdi_zorder                 (AtkObject *accessible);
 581 #endif /* ATK_DISABLE_DEPRECATED */
 582 AtkAttributeSet*        atk_object_get_attributes                 (AtkObject *accessible);
 583 AtkStateSet*            atk_object_ref_state_set                  (AtkObject *accessible);
 584 gint                    atk_object_get_index_in_parent            (AtkObject *accessible);
 585 void                    atk_object_set_name                       (AtkObject *accessible,
 586                                                                    const gchar *name);
 587 void                    atk_object_set_description                (AtkObject *accessible,
 588                                                                    const gchar *description);
 589 void                    atk_object_set_parent                     (AtkObject *accessible,
 590                                                                    AtkObject *parent);
 591 void                    atk_object_set_role                       (AtkObject *accessible,
 592                                                                    AtkRole   role);
 593
 594
 595 guint                atk_object_connect_property_change_handler  (AtkObject                      *accessible,
 596                                                                   AtkPropertyChangeHandler       *handler);
 597 void                 atk_object_remove_property_change_handler   (AtkObject                      *accessible,
 598                                                                   guint                          handler_id);
 599
 600 void                 atk_object_notify_state_change              (AtkObject                      *accessible,
 601                                                                   AtkState                       state,
 602                                                                   gboolean                       value);
 603 void                 atk_object_initialize                       (AtkObject                     *accessible,
 604                                                                   gpointer                      data);
 605
 606 const gchar*          atk_role_get_name      (AtkRole         role);
 607 AtkRole               atk_role_for_name      (const gchar     *name);
 608
 609
 610 /* NEW in 1.1: convenience API */
 611 gboolean              atk_object_add_relationship              (AtkObject      *object,
 612                                                                 AtkRelationType relationship,
 613                                                                 AtkObject      *target);
 614 gboolean              atk_object_remove_relationship           (AtkObject      *object,
 615                                                                 AtkRelationType relationship,
 616                                                                 AtkObject      *target);
 617 const gchar*          atk_role_get_localized_name              (AtkRole     role);
 618 const gchar*          atk_object_get_object_locale             (AtkObject   *accessible);
 619
 620 /* */
 621
 622
 623 /*
 624  * Note: the properties which are registered with the GType
 625  *   property registry, for type ATK_TYPE_OBJECT, are as follows:
 626  *
 627  *   "accessible-name"
 628  *   "accessible-description"
 629  *   "accessible-parent"
 630  *   "accessible-role"
 631  *   "accessible-value"
 632  *   "accessible-component-layer"
 633  *   "accessible-component-zorder"
 634  *   "accessible-table-caption"
 635  *   "accessible-table-column-description"
 636  *   "accessible-table-column-header"
 637  *   "accessible-table-row-description"
 638  *   "accessible-table-row-header"
 639  *   "accessible-table-summary"
 640  *   "accessible-model"
 641  *
 642  * accessibility property change listeners should use the
 643  *   normal GObject property interfaces and "property-change"
 644  *   signal handler semantics to interpret the property change
 645  *   information relayed from AtkObject.
 646  *   (AtkObject instances will connect to the "notify"
 647  *   signal in their host objects, and relay the signals when appropriate).
 648  */
 649
 650 /* For other signals, see related interfaces
 651  *
 652  *    AtkActionIface,
 653  *    AtkComponentIface,
 654  *    AtkHypertextIface,
 655  *    AtkImageIface,
 656  *    AtkSelectionIface,
 657  *    AtkTableIface,
 658  *    AtkTextIface,
 659  *    AtkValueIface.
 660  *
 661  *  The usage model for obtaining these interface instances is:
 662  *    ATK_<interfacename>_GET_IFACE(GObject *accessible),
 663  *    where accessible, though specified as a GObject, is
 664  *    the AtkObject instance being queried.
 665  *  More usually, the interface will be used via a cast to the
 666  *    interface's corresponding "type":
 667  *
 668  *    AtkText textImpl = ATK_TEXT(accessible);
 669  *    if (textImpl)
 670  *      {
 671  *        cpos = atk_text_get_caret_position(textImpl);
 672  *      }
 673  *
 674  *  If it's known in advance that accessible implements AtkTextIface,
 675  *    this is shortened to:
 676  *
 677  *    cpos = atk_text_get_caret_position (ATK_TEXT (accessible));
 678  */
 679
 680 G_END_DECLS
 681
 682 #endif /* __ATK_OBJECT_H__ */