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1 files changed, 326 insertions, 0 deletions

diff --git a/libjava/classpath/java/awt/dnd/DragSource.java b/libjava/classpath/java/awt/dnd/DragSource.java
new file mode 100644
index 000000000..af8b37668
--- /dev/null
+++ b/libjava/classpath/java/awt/dnd/DragSource.java
@@ -0,0 +1,326 @@
+/* DragSource.java --
+   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., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 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;
+
+import gnu.classpath.NotImplementedException;
+
+import java.awt.Component;
+import java.awt.Cursor;
+import java.awt.GraphicsEnvironment;
+import java.awt.HeadlessException;
+import java.awt.Image;
+import java.awt.Point;
+import java.awt.Toolkit;
+import java.awt.datatransfer.FlavorMap;
+import java.awt.datatransfer.SystemFlavorMap;
+import java.awt.datatransfer.Transferable;
+import java.awt.dnd.peer.DragSourceContextPeer;
+import java.io.Serializable;
+import java.util.EventListener;
+
+/**
+ * @since 1.2
+ */
+public class DragSource implements Serializable
+{
+  /**
+   * Compatible with JDK 1.2+.
+   */
+  private static final long serialVersionUID = 6236096958971414066L;
+
+  public static final Cursor DefaultCopyDrop = null;
+  public static final Cursor DefaultMoveDrop = null;
+  public static final Cursor DefaultLinkDrop = null;
+  public static final Cursor DefaultCopyNoDrop = null;
+  public static final Cursor DefaultMoveNoDrop = null;
+  public static final Cursor DefaultLinkNoDrop = null;
+
+  private transient FlavorMap flavorMap = SystemFlavorMap.getDefaultFlavorMap ();
+  private transient DragSourceListener dragSourceListener;
+  private transient DragSourceMotionListener dragSourceMotionListener;
+
+  private static DragSource ds;
+  private DragSourceContextPeer peer;
+  private DragSourceContext context;
+
+  /**
+   * Initializes the drag source.
+   *
+   * @exception HeadlessException If GraphicsEnvironment.isHeadless() is true.
+   */
+  public DragSource()
+  {
+    if (GraphicsEnvironment.isHeadless())
+      {
+        ds = null;
+        throw new HeadlessException();
+      }
+  }
+
+  /**
+   * Gets the default drag source.
+   *
+   * @exception HeadlessException If GraphicsEnvironment.isHeadless() is true.
+   */
+  public static DragSource getDefaultDragSource()
+  {
+    if (GraphicsEnvironment.isHeadless())
+      {
+        ds = null;
+        throw new HeadlessException();
+      }
+
+    if (ds == null)
+      ds = new DragSource();
+    return ds;
+  }
+
+  public static boolean isDragImageSupported()
+  {
+    // In all cases, Sun returns false here.
+    return false;
+  }
+
+  /**
+   * Start a drag, given the DragGestureEvent that initiated the drag.
+   *
+   * @exception InvalidDnDOperationException If the Drag and Drop system is
+   * unable to initiate a drag operation, or if the user attempts to start
+   * a drag while an existing drag operation is still executing.
+   */
+  public void startDrag(DragGestureEvent trigger, Cursor dragCursor,
+                        Image dragImage, Point imageOffset,
+                        Transferable trans, DragSourceListener dsl,
+                        FlavorMap map)
+  {
+    // http://www.javaworld.com/javaworld/jw-03-1999/jw-03-dragndrop.html
+
+    // This function creates a DragSourceContext object. This object tracks the
+    // state of the operation by listening to a native peer. In this situation,
+    // the DragSource may be obtained from the event or by an instance variable.
+    // This function also creates a new DragSourceContextPeer.
+
+    // This function sends the same message to the context, which then forwards
+    // it to the peer, passing itself as a parameter. Now, the native system has
+    // access to the Transferable through the context.
+
+    try
+      {
+        flavorMap = map;
+
+        if (peer == null)
+          peer = Toolkit.getDefaultToolkit().createDragSourceContextPeer(trigger);
+
+        if (context == null)
+          context = createDragSourceContext(peer, trigger,
+                                                            dragCursor,
+                                                            dragImage,
+                                                            imageOffset, trans,
+                                                            dsl);
+
+        if (peer == null)
+          throw new InvalidDnDOperationException();
+
+        peer.startDrag(context, dragCursor, dragImage, imageOffset);
+      }
+    catch (Exception e)
+      {
+        throw new InvalidDnDOperationException("Drag and Drop system is "
+                                + "unable to initiate a drag operation.");
+      }
+  }
+
+  /**
+   * Start a drag, given the DragGestureEvent that initiated the drag.
+   *
+   * @exception InvalidDnDOperationException If the Drag and Drop system is
+   * unable to initiate a drag operation, or if the user attempts to start
+   * a drag while an existing drag operation is still executing.
+   */
+  public void startDrag(DragGestureEvent trigger, Cursor dragCursor,
+                        Transferable trans, DragSourceListener dsl,
+                        FlavorMap map)
+  {
+    startDrag(trigger, dragCursor, null, null, trans, dsl, map);
+  }
+
+  /**
+   * Start a drag, given the DragGestureEvent that initiated the drag.
+   *
+   * @exception InvalidDnDOperationException If the Drag and Drop system is
+   * unable to initiate a drag operation, or if the user attempts to start
+   * a drag while an existing drag operation is still executing.
+   */
+  public void startDrag(DragGestureEvent trigger, Cursor dragCursor,
+                        Image dragImage, Point imageOffset,
+                        Transferable trans, DragSourceListener dsl)
+  {
+    startDrag(trigger, dragCursor, dragImage, imageOffset, trans, dsl, null);
+  }
+
+  /**
+   * Start a drag, given the DragGestureEvent that initiated the drag.
+   *
+   * @exception InvalidDnDOperationException If the Drag and Drop system is
+   * unable to initiate a drag operation, or if the user attempts to start
+   * a drag while an existing drag operation is still executing.
+   */
+  public void startDrag(DragGestureEvent trigger, Cursor dragCursor,
+                        Transferable trans, DragSourceListener dsl)
+  {
+    startDrag(trigger, dragCursor, null, null, trans, dsl, null);
+  }
+
+  /**
+   * Creates the DragSourceContext to handle this drag.
+   *
+   * @exception IllegalArgumentException
+   * @exception NullPointerException If dscp, dgl, dragImage or t is null.
+   */
+  protected DragSourceContext
+    createDragSourceContext(DragSourceContextPeer peer, DragGestureEvent dge,
+                            Cursor cursor, Image image, Point offset,
+                            Transferable t, DragSourceListener dsl)
+  {
+    return new DragSourceContext(peer, dge, cursor, image, offset, t, dsl);
+  }
+
+  public FlavorMap getFlavorMap()
+  {
+    return flavorMap;
+  }
+
+  public <T extends DragGestureRecognizer> T
+                    createDragGestureRecognizer(Class<T> recognizer,
+                                                Component c,
+                                                int actions,
+                                                DragGestureListener dgl)
+  {
+    return (T) Toolkit.getDefaultToolkit().createDragGestureRecognizer(recognizer,
+                                                                       this, c,
+                                                                       actions, dgl);
+  }
+
+  public DragGestureRecognizer createDefaultDragGestureRecognizer(Component c,
+                                                                  int actions,
+                                                                  DragGestureListener dgl)
+  {
+    return createDragGestureRecognizer(MouseDragGestureRecognizer.class, c,
+                                       actions, dgl);
+  }
+
+  /**
+   * @since 1.4
+   */
+  public void addDragSourceListener(DragSourceListener l)
+  {
+    DnDEventMulticaster.add (dragSourceListener, l);
+  }
+
+  /**
+   * @since 1.4
+   */
+  public void removeDragSourceListener(DragSourceListener l)
+  {
+    DnDEventMulticaster.remove (dragSourceListener, l);
+  }
+
+  /**
+   * @since 1.4
+   */
+  public DragSourceListener[] getDragSourceListeners()
+  {
+    return (DragSourceListener[]) getListeners (DragSourceListener.class);
+  }
+
+  /**
+   * @since 1.4
+   */
+  public void addDragSourceMotionListener(DragSourceMotionListener l)
+  {
+    DnDEventMulticaster.add (dragSourceMotionListener, l);
+  }
+
+  /**
+   * @since 1.4
+   */
+  public void removeDragSourceMotionListener(DragSourceMotionListener l)
+  {
+    DnDEventMulticaster.remove (dragSourceMotionListener, l);
+  }
+
+  /**
+   * @since 1.4
+   */
+  public DragSourceMotionListener[] getDragSourceMotionListeners ()
+  {
+    return (DragSourceMotionListener[]) getListeners
+                                         (DragSourceMotionListener.class);
+  }
+
+  /**
+   * @since 1.4
+   */
+  public <T extends EventListener> T[] getListeners (Class<T> listenerType)
+  {
+    if (listenerType == DragSourceListener.class)
+      return DnDEventMulticaster.getListeners (dragSourceListener,
+                                               listenerType);
+
+    if (listenerType == DragSourceMotionListener.class)
+      return DnDEventMulticaster.getListeners (dragSourceMotionListener,
+                                               listenerType);
+
+    // Return an empty EventListener array.
+    return (T[]) new EventListener [0];
+  }
+
+  /**
+   * TODO
+   * @return TODO
+   *
+   * @since 1.5
+   */
+  public static int getDragThreshold()
+    throws NotImplementedException
+  {
+    // FIXME: Not implemented.
+    return 8;
+  }
+} // class DragSource