javax.media.nativewindow
Class DefaultCapabilitiesChooser

java.lang.Object
  javax.media.nativewindow.DefaultCapabilitiesChooser

All Implemented Interfaces:

CapabilitiesChooser

public class DefaultCapabilitiesChooser
extends Object
implements CapabilitiesChooser

The default implementation of the CapabilitiesChooser interface, which provides consistent visual selection behavior across platforms. The precise algorithm is deliberately left loosely specified. Some properties are:

Attempts to match as closely as possible the given Capabilities, but will select one with fewer capabilities (i.e., lower color depth) if necessary.

If there is no exact match, prefers a more-capable visual to a less-capable one.

If there is more than one exact match, chooses an arbitrary one.

If a valid windowSystemRecommendedChoice parameter is supplied, chooses that instead of using the cross-platform code.

Constructor Summary

DefaultCapabilitiesChooser()

Method Summary

int	chooseCapabilities(CapabilitiesImmutable desired, List available, int windowSystemRecommendedChoice) Chooses the index (0..available.length - 1) of the Capabilities most closely matching the desired one from the list of all supported.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DefaultCapabilitiesChooser

public DefaultCapabilitiesChooser()

Method Detail

chooseCapabilities

public int chooseCapabilities(CapabilitiesImmutable desired,
                              List available,
                              int windowSystemRecommendedChoice)

Description copied from interface: CapabilitiesChooser

Chooses the index (0..available.length - 1) of the Capabilities most closely matching the desired one from the list of all supported. Some of the entries in the available array may be null; the chooser must ignore these. The windowSystemRecommendedChoice parameter may be provided to the chooser by the underlying window system; if this index is valid, it is recommended, but not necessarily required, that the chooser select that entry.

Note: this method is called automatically by the GraphicsConfigurationFactory.chooseGraphicsConfiguration(javax.media.nativewindow.CapabilitiesImmutable, javax.media.nativewindow.CapabilitiesImmutable, javax.media.nativewindow.CapabilitiesChooser, javax.media.nativewindow.AbstractGraphicsScreen) method when an instance of this class is passed in to it. It should generally not be invoked by users directly, unless it is desired to delegate the choice to some other CapabilitiesChooser object.

Specified by:

chooseCapabilities in interface CapabilitiesChooser