Examples of java.awt.dnd.DropTargetDragEvent

java.awt.dnd.DropTargetDragEvent
The DropTargetDragEvent is delivered to a DropTargetListener via its dragEnter() and dragOver() methods.
The DropTargetDragEvent reports the source drop actions and the user drop action that reflect the current state of the drag operation.
Source drop actions is a bitwise mask of DnDConstants that represents the set of drop actions supported by the drag source for this drag operation.
User drop action depends on the drop actions supported by the drag source and the drop action selected by the user. The user can select a drop action by pressing modifier keys during the drag operation:
```
 Ctrl + Shift -> ACTION_LINK Ctrl         -> ACTION_COPY Shift        -> ACTION_MOVE 
```
If the user selects a drop action, the user drop action is one of DnDConstants that represents the selected drop action if this drop action is supported by the drag source or DnDConstants.ACTION_NONE if this drop action is not supported by the drag source.
If the user doesn't select a drop action, the set of DnDConstants that represents the set of drop actions supported by the drag source is searched for DnDConstants.ACTION_MOVE, then for DnDConstants.ACTION_COPY, then for DnDConstants.ACTION_LINK and the user drop action is the first constant found. If no constant is found the user drop action is DnDConstants.ACTION_NONE. @since 1.2

    /**
     * Called from native method WinDropTarget::DragOver()
     * @return bit mask of DROPEFFECT_* constants according to dropAction
     */
    public int dragOver(int x, int y, int userAction, int sourceActions) {
        DropTargetDragEvent e = new DropTargetDragEvent(
                context, new Point(x, y), 
                WinDragSource.getDndActions(userAction), 
                WinDragSource.getDndActions(sourceActions));
        
        return dispatchEvent(e, DRAG_OVER);

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    public void run() {
        synchronized (dropMonitor) {
            switch (dragState) {
            case DRAG_ENTER:
            {
                DropTargetDragEvent e = (DropTargetDragEvent)currentEvent;
                context.getDropTarget().dragEnter(e);
                dropAction = e.getDropAction();
                break;
            }
            case DRAG_OVER:
            {
                DropTargetDragEvent e = (DropTargetDragEvent)currentEvent;
                context.getDropTarget().dragOver(e);
                dropAction = e.getDropAction();
                break;
            }
            case DRAG_DROP:
            {
                DropTargetDropEvent e = (DropTargetDropEvent)currentEvent;
                context.getDropTarget().drop(e);
                dropAction = e.getDropAction();
                break;
            }
            case DRAG_LEAVE:
            {
                context.getDropTarget().dragExit(currentEvent);

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  void testNullLoc(TestHarness h)
  {
    caught = false;
    try
      {
        new DropTargetDragEvent(dtc, null, DnDConstants.ACTION_COPY,
                                DnDConstants.ACTION_COPY);
      }
    catch (NullPointerException npe)
      {
        caught = true;

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  void testDropAction(TestHarness h)
  {
    caught = false;
    try
      {
        new DropTargetDragEvent(dtc, loc, 4, DnDConstants.ACTION_COPY);
      }
    catch (IllegalArgumentException iae)
      {
        caught = true;
      }

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  void testSrcAction(TestHarness h)
  {
    caught = false;
    try
      {
        new DropTargetDragEvent(dtc, loc, DnDConstants.ACTION_COPY, 4);
      }
    catch (IllegalArgumentException iae)
      {
        caught = true;
      }

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  }
  
  void testNormal(TestHarness h)
  {
    caught = false;
    DropTargetDragEvent dtde = null;
    try
      {
        dtde = new DropTargetDragEvent(dtc, loc, DnDConstants.ACTION_COPY,
                                DnDConstants.ACTION_COPY);
      }
    catch (Exception e)
      {
        caught = true;
      }
    
    h.check(!caught);    
    h.check(dtde != null && dtde.getDropAction() == DnDConstants.ACTION_COPY);
    h.check(dtde != null && dtde.getSourceActions() == DnDConstants.ACTION_COPY);
    h.check(dtde != null && dtde.getLocation().equals(loc));
  }

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        int currentAction = DragHandler.NONE;
        int sourceActions = DragHandler.NONE;
        Point location = null;
        DataFlavor[] flavors = new DataFlavor[0];
        if (e instanceof DropTargetDragEvent) {
            DropTargetDragEvent ev = (DropTargetDragEvent)e;
            currentAction = ev.getDropAction();
            sourceActions = ev.getSourceActions();
            flavors = ev.getCurrentDataFlavors();
            location = ev.getLocation();
        }
        else if (e instanceof DropTargetDropEvent) {
            DropTargetDropEvent ev = (DropTargetDropEvent)e;
            currentAction = ev.getDropAction();
            sourceActions = ev.getSourceActions();
            flavors = ev.getCurrentDataFlavors();
            location = ev.getLocation();
        }
        if (isSupported(flavors)) {
            int availableActions = getDropActionsForFlavors(flavors);
            currentAction = getDropAction(e, currentAction, sourceActions, availableActions);
            if (currentAction != DragHandler.NONE) {

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        if (false) {
            String msg = "drop: " + type;
            if (e instanceof DropTargetDragEvent) {
                DropTargetContext dtc = e.getDropTargetContext();
                DropTarget dt = dtc.getDropTarget();
                DropTargetDragEvent ev = (DropTargetDragEvent)e;
                msg += ": src=" + DragHandler.actionString(ev.getSourceActions())
                    + " tgt=" + DragHandler.actionString(dt.getDefaultActions())
                    + " act=" + DragHandler.actionString(ev.getDropAction());
            }
            else if (e instanceof DropTargetDropEvent) {
                DropTargetContext dtc = e.getDropTargetContext();
                DropTarget dt = dtc.getDropTarget();
                DropTargetDropEvent ev = (DropTargetDropEvent)e;
                msg += ": src=" + DragHandler.actionString(ev.getSourceActions())
                + " tgt=" + DragHandler.actionString(dt.getDefaultActions())
                + " act=" + DragHandler.actionString(ev.getDropAction());
            }
            if (!msg.equals(lastAction)) {
                System.out.println(lastAction = msg);
            }
        }

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            currentDTC.addNotify(this);


            currentA   = dt.getDefaultActions();


            try {
                ((DropTargetListener)dt).dragEnter(new DropTargetDragEvent(currentDTC,
                                                                           hots,
                                                                           currentDA,
                                                                           currentSA));
            } catch (Exception e) {
                e.printStackTrace();

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            }


            currentA = currentDT.getDefaultActions();


            try {
                DropTargetDragEvent dtde = new DropTargetDragEvent(dtc,
                                                                   hots,
                                                                   currentDA,
                                                                   currentSA);
                DropTargetListener dtl = (DropTargetListener)dt;
                if (operationChanged) {

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com.sun.jna.examples.dnd.DropHandler

com.sun.jna.platform.dnd.DropHandler

gnu.testlet.java.awt.dnd.DropTargetDragEvent.Constructors

org.apache.harmony.awt.datatransfer.windows.WinDropTarget

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