Handle rejected dropEvent

[Marcos Modenesi]

I'm implementing drag and drop on a QTableWidget and I want to prevent the user from dropping on some cells (depending on various factors). I can only detect if the drop will be allowed when the user tries to drop on a cartain cell. Then I perform some tests and ignore or accept the event in dropAction(QDropEvent *event).
Basically, my problem is that I can't detect whether the dropAction was ignored from within the startDrag function.
I'm really stranged, since I've been developping this on Ubuntu and it worked perfectly. The problem appaired when I tryed to build on Windows.

Briefly, theese are the functions I have:

@void TablaCentral::startDrag()
{
QTableWidgetItem item = currentItem();
if (/ item gathers some conditions */){
QMimeData *mimeData = new QMimeData;
...
QDrag *drag = new QDrag(this);
drag->setMimeData(mimeData);
...
if(drag->exec() == Qt::MoveAction){ // <-- <-- <-- I'm stuck here

           // it alywas enters here, don't know how to 
           // recongize an ignored dropEvent

    } else {

         // never enters here!!
         // I supposed it should enter here if I ignore on dropEvent(...)

    }
}

}

void TablaCentral::dragEnterEvent(QDragEnterEvent *event)
{
if (event->source() == this){
event->setDropAction(Qt::MoveAction);
event->accept();
}
}

void TablaCentral::dragMoveEvent(QDragMoveEvent *event)
{
if(event->source() == this){
event->setDropAction(Qt::MoveAction);
event->accept();
}
}

void TablaCentral::dropEvent(QDropEvent *event)
{
if(event->source() == this){
QTableWidgetItem targetItem = itemAt(event->pos());
if ( / targetItem doesn't gather some conditions */ ){
event->ignore();
return;
}
if (/some other conditions/){
event->ignore();
return;
} else {
// do something with the data
event->accept();
// this is the only case when I accept
}
}@

[Marcos Modenesi]

Found it on "this document.":http://qt-project.org/doc/qt-4.8/dnd.html Apparently, event->ignore() wasn't enough. I replaced it every time on dropEvent(QDropEvent *event) whith this:

@
event->setDropAction(Qt::IgnoreAction);
event->ignore();
@

Still it's odd to me how the problem didn't show up on Linux...