java.awt.dnd

Class DropTargetAdapter

  • All Implemented Interfaces:
    DropTargetListener, EventListener

    public abstract class DropTargetAdapter
    extends Object
    implements DropTargetListener
    An abstract adapter class for receiving drop target events. The methods in this class are empty. This class exists only as a convenience for creating listener objects.

    Extend this class to create a DropTargetEvent listener and override the methods for the events of interest. (If you implement the DropTargetListener interface, you have to define all of the methods in it. This abstract class defines a null implementation for every method except drop(DropTargetDropEvent), so you only have to define methods for events you care about.) You must provide an implementation for at least drop(DropTargetDropEvent). This method cannot have a null implementation because its specification requires that you either accept or reject the drop, and, if accepted, indicate whether the drop was successful.

    Create a listener object using the extended class and then register it with a DropTarget. When the drag enters, moves over, or exits the operable part of the drop site for that DropTarget, when the drop action changes, and when the drop occurs, the relevant method in the listener object is invoked, and the DropTargetEvent is passed to it.

    The operable part of the drop site for the DropTarget is the part of the associated Component's geometry that is not obscured by an overlapping top-level window or by another Component higher in the Z-order that has an associated active DropTarget.

    During the drag, the data associated with the current drag operation can be retrieved by calling getTransferable() on DropTargetDragEvent instances passed to the listener's methods.

    Note that getTransferable() on the DropTargetDragEvent instance should only be called within the respective listener's method and all the necessary data should be retrieved from the returned Transferable before that method returns.

    Since:
    1.4
    See Also:
    DropTargetEvent, DropTargetListener
    • Constructor Summary

      Constructors 
      Constructor and Description
      DropTargetAdapter() 

        

    • Method Summary

      Methods 
      Modifier and Type Method and Description
      void dragEnter(DropTargetDragEvent dtde)
      Called while a drag operation is ongoing, when the mouse pointer enters the operable part of the drop site for the DropTarget registered with this listener.
      void dragExit(DropTargetEvent dte)
      Called while a drag operation is ongoing, when the mouse pointer has exited the operable part of the drop site for the DropTarget registered with this listener.
      void dragOver(DropTargetDragEvent dtde)
      Called when a drag operation is ongoing, while the mouse pointer is still over the operable part of the drop site for the DropTarget registered with this listener.
      void dropActionChanged(DropTargetDragEvent dtde)
      Called if the user has modified the current drop gesture.

        

      • Methods inherited from interface java.awt.dnd.DropTargetListener

        drop
    • Constructor Detail

      • DropTargetAdapter

        public DropTargetAdapter()
    • Method Detail

      • dragEnter

        public void dragEnter(DropTargetDragEvent dtde)
        Called while a drag operation is ongoing, when the mouse pointer enters the operable part of the drop site for the DropTarget registered with this listener.
        Specified by:
        dragEnter in interface DropTargetListener
        Parameters:
        dtde - the DropTargetDragEvent
      • dragOver

        public void dragOver(DropTargetDragEvent dtde)
        Called when a drag operation is ongoing, while the mouse pointer is still over the operable part of the drop site for the DropTarget registered with this listener.
        Specified by:
        dragOver in interface DropTargetListener
        Parameters:
        dtde - the DropTargetDragEvent
      • dragExit

        public void dragExit(DropTargetEvent dte)
        Called while a drag operation is ongoing, when the mouse pointer has exited the operable part of the drop site for the DropTarget registered with this listener.
        Specified by:
        dragExit in interface DropTargetListener
        Parameters:
        dte - the DropTargetEvent

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

06/11/2024 02:36:05 Cette version de la page est en cache (à la date du 06/11/2024 02:36:05) 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 03/08/2006, dernière modification le 04/03/2020
Source du document imprimé : https://www.gaudry.be/java-api-rf-java/awt/dnd/DropTargetAdapter.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, DropTargetAdapter

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