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.
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