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Accessibility::Component Interface Reference

import "Accessibility_Component.idl";

Public Member Functions

boolean contains (in long x, in long y, in short coord_type)
Accessible getAccessibleAtPoint (in long x, in long y, in short coord_type)
BoundingBox getExtents (in short coord_type)
void getPosition (out long x, out long y, in short coord_type)
void getSize (out long width, out long height)
ComponentLayer getLayer ()
short getMDIZOrder ()
boolean grabFocus ()
void registerFocusHandler (in EventListener handler)
void deregisterFocusHandler (in EventListener handler)
double getAlpha ()

Detailed Description

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.

the meaning and defined values of the short coord_type parameter used by some Component methods is as follows:

Events emitted by Component instances include:

Member Function Documentation

boolean Accessibility::Component::contains in long  x,
in long  y,
in short  coord_type

True if the specified point lies within the Component's bounding box, False otherwise.

void Accessibility::Component::deregisterFocusHandler in EventListener  handler  ) 

Request that an EventListener registered via registerFocusHandler no longer be notified when this object receives keyboard focus.

Accessible Accessibility::Component::getAccessibleAtPoint in long  x,
in long  y,
in short  coord_type

the Accessible child whose bounding box contains the specified point.

double Accessibility::Component::getAlpha  ) 

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.

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 also:
AT-SPI 1.7.0

BoundingBox Accessibility::Component::getExtents in short  coord_type  ) 

Obtain the Component's bounding box, in pixels, relative to the specified coordinate system.

a BoundingBox which entirely contains the object's onscreen visual representation.

ComponentLayer Accessibility::Component::getLayer  ) 

the ComponentLayer in which this object resides.

short Accessibility::Component::getMDIZOrder  ) 

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.

only relevant for objects in LAYER_MDI or LAYER_WINDOW
an integer indicating the object's place in the stacking order.

void Accessibility::Component::getPosition out long  x,
out long  y,
in short  coord_type

Obtain the position of the current component in the coordinate system specified by coord_type.

x an out parameter which will be back-filled with the returned x coordinate.
y an out parameter which will be back-filled with the returned y coordinate.

void Accessibility::Component::getSize out long  width,
out long  height

Obtain the size, in the coordinate system specified by coord_type, of the rectangular area which fully contains the object's visual representation, without accounting for viewport clipping.

width the object's horizontal extents in the specified coordinate system.
height the object's vertical extents in the specified coordinate system.

boolean Accessibility::Component::grabFocus  ) 

Request that the object obtain keyboard focus.

True if keyboard focus was successfully transferred to the Component.

void Accessibility::Component::registerFocusHandler in EventListener  handler  ) 

Register an EventListener for notification when this object receives keyboard focus.

you probably want to register for ¨focus:¨ events via Registry::registerGlobalEventListener instead.

The documentation for this interface was generated from the following file:
Generated on Tue Jul 18 16:56:16 2006 for at-spi-idl by  doxygen 1.4.3