java.awt

Class DefaultFocusTraversalPolicy

  • All Implemented Interfaces:
    java.io.Serializable
    public class DefaultFocusTraversalPolicy extends ContainerOrderFocusTraversalPolicy
    A FocusTraversalPolicy that determines traversal order based on the order of child Components in a Container. From a particular focus cycle root, the policy makes a pre-order traversal of the Component hierarchy, and traverses a Container's children according to the ordering of the array returned by Container.getComponents(). Portions of the hierarchy that are not visible and displayable will not be searched.

    If client code has explicitly set the focusability of a Component by either overriding Component.isFocusTraversable() or Component.isFocusable(), or by calling Component.setFocusable(), then a DefaultFocusTraversalPolicy behaves exactly like a ContainerOrderFocusTraversalPolicy. If, however, the Component is relying on default focusability, then a DefaultFocusTraversalPolicy will reject all Components with non-focusable peers. This is the default FocusTraversalPolicy for all AWT Containers.

    The focusability of a peer is implementation-dependent. Sun recommends that all implementations for a particular native platform construct peers with the same focusability. The recommendations for Windows and Unix are that Canvases, Labels, Panels, Scrollbars, ScrollPanes, Windows, and lightweight Components have non-focusable peers, and all other Components have focusable peers. These recommendations are used in the Sun AWT implementations. Note that the focusability of a Component's peer is different from, and does not impact, the focusability of the Component itself.

    Please see How to Use the Focus Subsystem, a section in The Java Tutorial, and the Focus Specification for more information.

    Since:
    1.4
    See Also:
    Container.getComponents(), Component.isFocusable(), Component.setFocusable(boolean), Serialized Form
    • Constructors 
      Constructor and Description
      Ordinary member indicator DefaultFocusTraversalPolicy Reveal DetailHide Detail
       
    • Methods 
      Modifier and Type Method and Description
      Inherited member indicator getComponentAfter Reveal DetailHide Detail
      Returns the Component that should receive the focus after aComponent.
      Inherited member indicator getComponentBefore Reveal DetailHide Detail
      Returns the Component that should receive the focus before aComponent.
      Inherited member indicator getDefaultComponent Reveal DetailHide Detail
      Returns the default Component to focus.
      Inherited member indicator getFirstComponent Reveal DetailHide Detail
      Returns the first Component in the traversal cycle.
      Inherited member indicator getImplicitDownCycleTraversal Reveal DetailHide Detail
      Returns whether this ContainerOrderFocusTraversalPolicy transfers focus down-cycle implicitly.
      Inherited member indicator getInitialComponent Reveal DetailHide Detail
      Returns the Component that should receive the focus when a Window is made visible for the first time.
      Inherited member indicator getLastComponent Reveal DetailHide Detail
      Returns the last Component in the traversal cycle.
      Inherited member indicator setImplicitDownCycleTraversal Reveal DetailHide Detail
      Sets whether this ContainerOrderFocusTraversalPolicy transfers focus down-cycle implicitly.
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
This document was created by Dulcet from the OpenJDK sources. Copyright © 1993, 2012 Oracle and/or its affiliates. All rights reserved.

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