Name: dsR10078 Date: 11/06/2002

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The problem is reproducible on all platforms with JDK 1.4.2-b03 and later.
To reproduce compile and run the following test case:
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import java.awt.*;
import java.awt.datatransfer.*;
import java.awt.dnd.*;

public class Test {
    public static void main(String[] args) {
        final Frame f = new Frame();
        final DragSource ds = DragSource.getDefaultDragSource();
        final Transferable t = new StringSelection("TEXT");
        final DragSourceListener dsl = new DragSourceAdapter() {
                public void dragEnter(DragSourceDragEvent dsde) {
                    System.out.println("[Source]dragEnter userAction=" +
                                       Integer.toHexString(dsde.getUserAction())
                                       + " dropAction=" +
                                       Integer.toHexString(dsde.getDropAction()));
                }
                public void dragOver(DragSourceDragEvent dsde) {
                    System.out.println("[Source]dragOver userAction=" +
                                       Integer.toHexString(dsde.getUserAction())
                                       + " dropAction=" +
                                       Integer.toHexString(dsde.getDropAction()));
                }
                public void dropActionChanged(DragSourceDragEvent dsde) {
                    System.out.println("[Source]dropActionChanged userAction=" +
                                       Integer.toHexString(dsde.getUserAction())
                                       + " dropAction=" +
                                       Integer.toHexString(dsde.getDropAction()));
                    }
            };
        final DragGestureListener dgl = new DragGestureListener() {
                public void dragGestureRecognized(DragGestureEvent dge) {
                    dge.startDrag(null, t, dsl);
                }
            };
        final DragGestureRecognizer dgr =
            ds.createDefaultDragGestureRecognizer(f,
                                                  DnDConstants.ACTION_COPY_OR_MOVE, dgl);
        final DropTargetListener dtl = new DropTargetAdapter() {
                public void dragEnter(DropTargetDragEvent dtde) {
                    System.out.println("[Target]dragEnter action=" +
                                       Integer.toHexString(dtde.getDropAction()));
                    dtde.rejectDrag();
                }
                public void dragOver(DropTargetDragEvent dtde) {
                    int dropAction = dtde.getDropAction();
                    System.out.println("[Target]dragOver action=" +
                                       Integer.toHexString(dropAction));
                    if (dropAction != DnDConstants.ACTION_NONE) {
                        dtde.acceptDrag(dropAction);
                    }
                }
                public void drop(DropTargetDropEvent dtde) {
                    dtde.rejectDrop();
                }
            };
        final DropTarget dt = new DropTarget(f, dtl);

        f.setBounds(100, 100, 100, 100);
        f.setVisible(true);
    }
}
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A frame will appear.
Press the left mouse button inside the frame and drag the mouse, holding
the mouse button pressed. Do not press any modifier keys during drag.
Here is a typical output for 1.4.2-b01:
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[Target]dragEnter action=2
[Target]dragOver action=2
[Source]dragOver userAction=2 dropAction=2
[Target]dragOver action=2
[Source]dragOver userAction=2 dropAction=2
[Target]dragOver action=2
[Source]dragOver userAction=2 dropAction=2
[Target]dragOver action=2
[Source]dragOver userAction=2 dropAction=2
[Target]dragOver action=2
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The output for 1.4.2-b03 and later:
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[Target]dragEnter action=2
[Target]dragOver action=0
[Target]dragOver action=0
[Target]dragOver action=0
[Target]dragOver action=0
[Target]dragOver action=0
[Target]dragOver action=0
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The new behavior doesn't match the javadoc, as
DropTargetDragEvent.getDropAction() is documented to return the "user drop
action" that depends on the drop actions supported by the drag source and
the drop action selected by the user. According to the specification the
"user drop action" is ACTION_MOVE as the drag source supports COPY and MOVE
actions and the user doesn't select a drop action.
With 1.4.2-b03 and later, getDropAction() incorrectly returns ACTION_NONE.

Another problem is that according to the javadoc, DragSourceListener.dragOver()
should be called if the drop target accepts the drag. The test case demonstrates
that with 1.4.2-b03, if the drop target rejected the drag initially,
DragSourceListener.dragOver() will never be called even if the drop target
accepts the drag later.

###@###.### 2002-11-06
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