using org.freestandards.atspi.Accessible.Reference = Reference;

/*
  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.
*/
interface org.freestandards.atspi.Component {

	/* 
           Used by Component, Image and Text interfaces to specify whether coordinates are
           relative to the window or screen.
        */
	enum <uint32> CoordType {
		COORD_TYPE_SCREEN = 0,
		COORD_TYPE_WINDOW = 1
	}

	/*
	  Used by Component and Text interfaces, a struct defining a bounding rectange.
	  The coordinate system is determined by the context of the API call.
	*/
	struct BoundingBox {
		int32 x;
		int32 y;
		int32 width;
		int32 height;
	}

	/*
	  Indicates the relative stacking order with respect to the onscreen visual representation.

	  The order of layers, from bottom to top is:
		LAYER_BACKGROUND
		LAYER_WINDOW
		LAYER_MDI
		LAYER_CANVAS
		LAYER_WIDGET
		LAYER_POPUP
		LAYER_OVERLAY
	*/
	enum <uint32> ComponentLayer {
		LAYER_INVALID,
		LAYER_BACKGROUND,
		LAYER_CANVAS,
		LAYER_WIDGET,
		LAYER_MDI,
		LAYER_POPUP,
		LAYER_OVERLAY,
		LAYER_WINDOW,
		LAYER_LAST_DEFINED
	}
	
	/*
	  True if the specified point lies within the components bounding box.
         */ 
	method Contains {
		int32 x;
		int32 y;
		CoordType coord_type;
	} reply {
		boolean within;
	}

	/*
	  Return the accessible child whose bounding box contains the specified point.
         */
	method GetAccessibleAtPoint {
		int32 x;
		int32 y;
		CoordType coord_type;
	} reply {
		Reference child;
	}

	/*
	  Obtain the components bounding box, in pixels, relative to the specified coordinate system.
	*/
	method GetExtents {
		CoordType cood_type;
	} reply {
		BoundingBox box;
	}

	/*
	  Obtain the position of the current component in the specified coordinate system.
	*/
	method GetPosition {
		CoordType coord_type;
	} reply {
		int32 x;
		int32 y;
	}

	/*
	  Obtain the size in the specified coordinate system.
          Fully contains teh object's visual representation without accounting for viewport clipping.
        */
	method GetSize reply {
		int32 width;
		int32 height;
	}

	/*
	  The component layer in which this object resides.
        */
	method GetLayer reply {
		ComponentLayer layer;
	}

	/*
          Obtain the relative stacking order (i.e 'Z' order) of an object.
	  Larger values indicate that an object is on 'top' of the stack.
	  Only relevenat for objects in LAYER_MDI or LAYER_WINDOW.
	*/
	method GetMDIZOrder reply {
		int16 order;
	}

	/*
	  Request that an object obtain keyboard focus.
        */
	method GrabFocus reply {
		boolean success;
	}

	/*
	  Obtain the alpha value of the component.
	  Alpha values are used with Z-Order to determine whether an obeject obscures
	  anothers visual representation.
	*/
	method GetAlpha reply {
		double alpha;
	}
}