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- /*
- * AT-SPI - Assistive Technology Service Provider Interface
- * (Gnome Accessibility Project; http://developer.gnome.org/projects/gap)
- *
- * 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.
- */
-
- #include <Accessibility_Event.idl>
-
- module Accessibility {
-
- /**
- * The ComponentLayer of a Component instance indicates its relative stacking order
- * with respect to the onscreen visual representation of the UI.
- * ComponentLayer, in combination with Component bounds information, can be used
- * to compute the visibility of all or part of a component. This is important in
- * programmatic determination of region-of-interest for magnification, and in
- * ¨flat screen review¨ models of the screen, as well as for other uses.
- * Objects residing in two of the ComponentLayer categories support
- * further z-ordering information, with respect to their peers in the same layer:
- * namely, LAYER_WINDOW and LAYER_MDI. Relative stacking order for other objects within
- * the same layer is not available; the recommended heuristic is ¨first child paints first¨,
- * in other words, assume that the first siblings in the child list are subject to being
- * overpainted by later siblings if their bounds intersect.
- *
- * The order of layers, from bottom to top, is:
- * \li LAYER_BACKGROUND
- * \li LAYER_WINDOW
- * \li LAYER_MDI
- * \li LAYER_CANVAS
- * \li LAYER_WIDGET
- * \li LAYER_POPUP
- * \li LAYER_OVERLAY
- */
- enum ComponentLayer {
- LAYER_INVALID,/**< Indicates an error condition or uninitialized value. */
- LAYER_BACKGROUND,/**< The bottom-most layer, over which everything else is painted.
- * The 'desktop background' is generally in this layer. */
- LAYER_CANVAS,/**< The 'background' layer for most content renderers and UI Component
- * containers. */
- LAYER_WIDGET,/**< The layer in which the majority of ordinary 'foreground' widgets reside.*/
- LAYER_MDI,/**< A special layer between LAYER_CANVAS and LAYER_WIDGET, in which the
- * 'pseudo windows' (e.g. the MDI frames) reside.
- * @see Component::getMDIZOrder */
- LAYER_POPUP,/**< A layer for popup window content, above LAYER_WIDGET. */
- LAYER_OVERLAY,/**< The topmost layer. */
- LAYER_WINDOW,/**< The layer in which a toplevel window background usually resides. */
- LAYER_LAST_DEFINED/**< Used only to determine the end of the enumeration. */
- };
-
- /**
- * The Component interface is implemented by objects which occupy on-screen space, e.g. objects
- * which have onscreen visual representations. The methods in Component allow clients to identify
- * where the objects lie in the onscreen coordinate system, their relative size, stacking order, and
- * position. It also provides a mechanism whereby keyboard focus may be transferred to specific
- * user interface elements programmatically. This is a 2D API, coordinates of 3D objects are projected into the
- * 2-dimensional screen view for purposes of this interface.
- *
- * @note the meaning and defined values of the \c short \c coord_type parameter used by some
- * Component methods is as follows:
- * \li 0 indicates coord_type_xy_screen, coordinates are relative to the display screen, in pixels.
- * \li 1 indicates coord_type_xy_window, coordinates are relative to the current toplevel window, in pixels.
- *
- * @note Events emitted by Component instances include:
- * \li \c "object:bounds-changed"
- * \li \c "object:visible-data-changed"
- */
- interface Component : Bonobo::Unknown {
-
- /**
- * @returns \c True if the specified point lies within the Component's bounding box,
- * \c False otherwise.
- */
- boolean contains (in long x, in long y, in short coord_type);
- /**
- * @returns the Accessible child whose bounding box contains the specified point.
- */
- Accessible getAccessibleAtPoint (in long x, in long y, in short coord_type);
- /**
- * Obtain the Component's bounding box, in pixels, relative to the specified coordinate system.
- * @returns a BoundingBox which entirely contains the object's onscreen visual representation.
- **/
- BoundingBox getExtents (in short coord_type);
- /**
- * Obtain the position of the current component in the coordinate system specified
- * by \c coord_type.
- * @param coord_type
- * @param x an out parameter which will be back-filled with the returned x coordinate.
- * @param y an out parameter which will be back-filled with the returned y coordinate.
- */
- void getPosition (out long x, out long y, in short coord_type);
- /**
- * Obtain the size, in the coordinate system specified by \c coord_type,
- * of the rectangular area which fully contains the object's
- * visual representation, without accounting for viewport clipping.
- * @param width the object's horizontal extents in the specified coordinate system.
- * @param height the object's vertical extents in the specified coordinate system.
- */
- void getSize (out long width, out long height);
- /** @returns the ComponentLayer in which this object resides. */
- ComponentLayer getLayer ();
- /**
- * Obtain the relative stacking order (i.e. 'Z' order) of an object.
- * Larger values indicate that an object is on "top" of the stack, therefore
- * objects with smaller MDIZOrder may be obscured by objects with a larger MDIZOrder,
- * but not vice-versa.
- * @note only relevant for objects in LAYER_MDI or LAYER_WINDOW
- * @returns an integer indicating the object's place in the stacking order.
- */
- short getMDIZOrder ();
- /**
- * Request that the object obtain keyboard focus.
- *
- * @returns \c True if keyboard focus was successfully transferred to the Component.
- */
- boolean grabFocus ();
- /**
- * Register an EventListener for notification when this object receives keyboard focus.
- * @note you probably want to register for ¨focus:¨ events via
- * Registry::registerGlobalEventListener instead.
- */
- void registerFocusHandler (in EventListener handler);
- /**
- * Request that an EventListener registered via registerFocusHandler no longer be notified
- * when this object receives keyboard focus.
- */
- void deregisterFocusHandler (in EventListener handler);
-
- /**
- * Obtain the alpha value of the component. An alpha value of 1.0 or greater
- * indicates that the object is fully opaque, and an alpha value of 0.0 indicates
- * that the object is fully transparent. Negative alpha values have no defined
- * meaning at this time.
- *
- * @note alpha values are used in conjunction with Z-order calculations to
- * determine whether an object wholly or partially obscures another object's
- * visual intersection, in the event that their bounds intersect.
- *
- * @see STATE_OPAQUE
- *
- * @since AT-SPI 1.7.0
- */
- double getAlpha ();
-
- /** \cond
- * unImplemented:
- *
- * placeholders for future expansion.
- */
- void unImplemented ();
- void unImplemented2 ();
- void unImplemented3 ();
- /** \endcond */
- };
- };
-