based on html5 spec, the way to disallow a drop is to return true inside dragover
function dragOver(ev) { return true; } but in GWT, the dragover hander has a void return type. there is no way to return anything. panel1.addBitlessDomHandler(new DragOverHandler() { @Override public void onDragOver(DragOverEvent event) { // can not return anything. } }, DragOverEvent.getType()); It is quite possible, GWT implementation simply messed this one up. -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-web-toolkit+unsubscr...@googlegroups.com. To post to this group, send email to google-web-toolkit@googlegroups.com. Visit this group at http://groups.google.com/group/google-web-toolkit?hl=en. For more options, visit https://groups.google.com/groups/opt_out.