Solved: Problem with const in dragMoveEvent

[Rory_1]

I'm a beginner and struggling with const, so I'm hoping someone here can help me "over the hump". I am trying to subclass QTextEdit to intercept a drag from a QListWidget. I need to determine what the text is in the QListItem and set the QMimeData data to text/plain. Here is what I have so far:

@void TextEditDrop::dragEnterEvent(QDragEnterEvent *e)
{
const QMimeData *mimeData = e->mimeData();
QByteArray encoded = mimeData->data("application/x-qabstractitemmodeldatalist");
QDataStream stream(&encoded, QIODevice::ReadOnly);
QString item;
int row, col;
QMap<int, QVariant> roleDataMap;
while (!stream.atEnd())
{
stream >> row >> col >> roleDataMap;
item = roleDataMap.value( Qt::DisplayRole ).toString();
}

// Next statement generates error
// error: C2662: 'QMimeData::setText' : cannot convert 'this' pointer from 
//               'const QMimeData' to 'QMimeData &'
mimeData->setText(item);

// this also does not work:
mimeData->setText(const_cast<QString>(item));  // cannot convert from QString to QString

}@

I believe I have to const_cast item but I have not been able to discover a syntax that works. Any help much appreciated.

[Sam]

First of all you need to perform your operations in dropEvent(), Secondly why are you using const QMimeData you can use QMimeData instead.

Check "Drag and Drop Puzzle Example":http://qt-project.org/doc/qt-4.8/draganddrop-puzzle.html

[Rory_1]

Thanks. I'll check out the example.

[Rory_1]

I solved this issue by subclassing QListWidget::startDrag and creating a QMimeData->setText.