JDK8/Java8源码在线阅读

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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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package java.awt.dnd;

import java.util.EventListener;

/**
 * The listener interface for receiving drag gesture events.
 * This interface is intended for a drag gesture recognition
 * implementation. See a specification for {@code DragGestureRecognizer}
 * for details on how to register the listener interface.
 * Upon recognition of a drag gesture the {@code
 * DragGestureRecognizer} calls this interface's
 * {@link #dragGestureRecognized dragGestureRecognized()}
 * method and passes a {@code DragGestureEvent}.

 *
 * @see java.awt.dnd.DragGestureRecognizer
 * @see java.awt.dnd.DragGestureEvent
 * @see java.awt.dnd.DragSource
 */

 public interface DragGestureListener extends EventListener {

    /**
     * This method is invoked by the {@code DragGestureRecognizer}
     * when the {@code DragGestureRecognizer} detects a platform-dependent
     * drag initiating gesture. To initiate the drag and drop operation,
     * if appropriate, {@link DragGestureEvent#startDrag startDrag()} method on
     * the {@code DragGestureEvent} has to be invoked.
     * <P>

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