Class DropTargetAdapter

java.lang.Object
java.awt.dnd.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:

  • Constructor Summary

    Constructors
    Modifier
    Constructor
    Description
    protected
    DropTargetAdapter()
    Constructs a DropTargetAdapter.

  • Method Summary

    Modifier and Type
    Method
    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 declared in class Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    Modifier and Type
    Method
    Description
    protected Object
    clone()
    Creates and returns a copy of this object.
    boolean
    equals(Object obj)
    Indicates whether some other object is "equal to" this one.
    protected void
    finalize()
    Deprecated, for removal: This API element is subject to removal in a future version.
    Finalization is deprecated and subject to removal in a future release.
    final Class<?>
    getClass()
    Returns the runtime class of this Object.
    int
    hashCode()
    Returns a hash code value for this object.
    final void
    notify()
    Wakes up a single thread that is waiting on this object's monitor.
    final void
    notifyAll()
    Wakes up all threads that are waiting on this object's monitor.
    String
    toString()
    Returns a string representation of the object.
    final void
    wait()
    Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
    final void
    wait(long timeoutMillis)
    Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
    final void
    wait(long timeoutMillis, int nanos)
    Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

    Methods declared in interface DropTargetListener

    drop
    Modifier and Type
    Method
    Description
    void
    drop(DropTargetDropEvent dtde)
    Called when the drag operation has terminated with a drop on the operable part of the drop site for the DropTarget registered with this listener.

  • Constructor Details

    • DropTargetAdapter

      protected DropTargetAdapter()
      Constructs a DropTargetAdapter.

  • Method Details

    • 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

    • dropActionChanged

      public void dropActionChanged(DropTargetDragEvent dtde)
      Called if the user has modified the current drop gesture.
      Specified by:
      dropActionChanged 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