Bug 5699 Add ResourceTransfer to packages view
The packages view should add the ResoruceTransfer as a drag source to its list of transfers
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/dnd/JdtViewerDropAdapter.java
}
		computeFeedback(event);
	}
	
	public void dropAccept(DropTargetEvent event) {
		fTarget= computeTarget(event);
		validateDrop(event);
		fLastOperation= event.detail;
	}
	
	/**
	 * Returns the data hold by <code>event.item</code>. Inside a viewer
	 * this corresponds to the items data model element.
	 */
	protected Object computeTarget(DropTargetEvent event) {
		return event.item == null ? null : event.item.getData();
	}
	
	/**
	 * Returns the position of the given coordinates relative to the given target.
	 * The position is determined to be before, after, or on the item, based on 
	 * some threshold value. The return value is one of the LOCATION_* constants 
	 * defined in this class.
	 */
	final protected int computeLocation(DropTargetEvent event) {
		if (!(event.item instanceof Item)) {
			return LOCATION_NONE;
		}
		
		Item item= (Item) event.item;