AWT/Swing merge from GNU Classpath.

From-SVN: r56147

libjava/java/awt/dnd/DragSourceAdapter.java

@@ -0,0 +1,126 @@
+/* DragSourceAdapter.java -- drag-and-drop listener adapter
+   Copyright (C) 2002 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+02111-1307 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package java.awt.dnd;
+
+/**
+ * This class implements <code>DragSourceListener</code> and
+ * <code>DragSourceMotionListener</code>, and implements all methods
+ * with empty bodies.  This allows a listener interested in implementing only
+ * a subset of these interfaces to extend this class and override only the
+ * desired methods.
+ *
+ * @author Eric Blake <ebb9@email.byu.edu>
+ * @see DragSourceEvent
+ * @see DragSourceListener
+ * @see DragSourceMotionListener
+ * @since 1.4
+ * @status updated to 1.4
+ */
+public abstract class DragSourceAdapter
+  implements DragSourceListener, DragSourceMotionListener
+{
+  /**
+   * Default constructor.
+   */
+  public DragSourceAdapter()
+  {
+  }
+
+  /**
+   * Called when the cursor hotspot enters a drop site which will accept the
+   * drag.
+   *
+   * @param e the event
+   */
+  public void dragEnter(DragSourceDragEvent e)
+  {
+  }
+
+  /**
+   * Called when the cursor hotspot moves inside of a drop site which will
+   * accept the drag.
+   *
+   * @param e the event
+   */
+  public void dragOver(DragSourceDragEvent e)
+  {
+  }
+
+  /**
+   * Called whenever the mouse is moved during a drag-and-drop operation.
+   *
+   * @param e the event
+   */
+  public void dragMouseMoved(DragSourceDragEvent e)
+  {
+  }
+
+  /**
+   * Called when the user modifies the drop gesture. This is often the case
+   * when additional mouse or key events are received during the drag.
+   *
+   * @param e the event
+   */
+  public void dropActionChanged(DragSourceDragEvent e)
+  {
+  }
+
+  /**
+   * Called when the cursor hotspot moves outside of a drop site which will
+   * accept the drag. This could also happen if the drop site is no longer
+   * active, or no longer accepts the drag.
+   *
+   * @param e the event
+   */
+  public void dragExit(DragSourceDragEvent e)
+  {
+  }
+
+  /**
+   * Called when the drag and drop operation is complete. After this event,
+   * <code>getDropSuccess</code> of the event is valid, and
+   * <code>getDropAction</code> holds the action requested by the drop site.
+   * Furthermore, the <code>DragSourceContext</code> is invalidated.
+   *
+   * @param e the event
+   */
+  public void dragDropEnd(DragSourceDragEvent e)
+  {
+  }
+} // class DragSourceAdapter