java.awt

Class DefaultFocusTraversalPolicy

Table des matières
  • All Implemented Interfaces:
    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

    • Constructor Detail

      • DefaultFocusTraversalPolicy

        public DefaultFocusTraversalPolicy()

    • Method Detail

      • accept

        protected boolean accept(Component aComponent)
        Determines whether a Component is an acceptable choice as the new focus owner. The Component must be visible, displayable, and enabled to be accepted. If client code has explicitly set the focusability of the Component by either overriding Component.isFocusTraversable() or Component.isFocusable(), or by calling Component.setFocusable(), then the Component will be accepted if and only if it is focusable. If, however, the Component is relying on default focusability, then all Canvases, Labels, Panels, Scrollbars, ScrollPanes, Windows, and lightweight Components will be rejected.
        Overrides:
        accept in class ContainerOrderFocusTraversalPolicy
        Parameters:
        aComponent - the Component whose fitness as a focus owner is to be tested
        Returns:
        true if aComponent meets the above requirements; false otherwise

Traduction non disponible

Les API Java ne sont pas encore traduites en français sur l'infobrol. Seule la version anglaise est disponible pour l'instant.

Version en cache

21/11/2024 21:50:50 Cette version de la page est en cache (à la date du 21/11/2024 21:50:50) afin d'accélérer le traitement. Vous pouvez activer le mode utilisateur dans le menu en haut pour afficher la dernère version de la page.

Document créé le 31/08/2006, dernière modification le 04/03/2020
Source du document imprimé : https://www.gaudry.be/java-api-rf-java/awt/defaultfocustraversalpolicy.html

L'infobrol est un site personnel dont le contenu n'engage que moi. Le texte est mis à disposition sous licence CreativeCommons(BY-NC-SA). Plus d'info sur les conditions d'utilisation et sur l'auteur.

Références

  1. Consulter le document html Langue du document :fr Manuel PHP : https://docs.oracle.com, DefaultFocusTraversalPolicy

Ces références et liens indiquent des documents consultés lors de la rédaction de cette page, ou qui peuvent apporter un complément d'information, mais les auteurs de ces sources ne peuvent être tenus responsables du contenu de cette page.
L'auteur de ce site est seul responsable de la manière dont sont présentés ici les différents concepts, et des libertés qui sont prises avec les ouvrages de référence. N'oubliez pas que vous devez croiser les informations de sources multiples afin de diminuer les risques d'erreurs.

Table des matières Haut