Hi,

I have a problem concerning drag'n'drop and QTableWidget. I have subclassed QTableWidget and implemented drag'n'drop by reimplementing dragEnterEvent, dragMoveEvent and dropEvent. It works as I expect. But if I place a QLabel as a child on the QTableWidget, I cannot drop items on the QLabel ( I want to receive the dropevent in QTableWidget). Here is some sample code

table.h
Qt Code: 
  1. #ifndef TABLE_H
  2. #define TABLE_H
  3.  
  4. #include <QTableWidget>
  5.  
  6. class Table : public QTableWidget
  7. {
  8. Q_OBJECT
  9. public:
  10.     explicit Table(QWidget *parent = 0);
  11.  
  12. protected:
  13.     void dragEnterEvent(QDragEnterEvent *event);
  14.     void dragMoveEvent(QDragMoveEvent *event);
  15.     void dropEvent(QDropEvent *event);
  16. };
  17.  
  18. #endif // TABLE_H
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table.cpp
Qt Code: 
  1. #include "table.h"
  2. #include <QLabel>
  3. #include <QDebug>
  4. #include <QDragEnterEvent>
  5. #include <QDragMoveEvent>
  6.  
  7. Table::Table(QWidget *parent) :
  8.     QTableWidget(parent)
  9. {
  10.     setMinimumSize(200, 200);
  11.     setAcceptDrops(true);
  12.     QLabel* label = new QLabel(this);
  13.     label->setText("a long dummy text\na long dummy text\na long dummy text\na long dummy text\n");
  14.     label->move(30, 32);
  15.     label->setEnabled(true);
  16. //    label->setAcceptDrops(false)
  17. }
  18.  
  19. void Table::dragEnterEvent(QDragEnterEvent* event)
  20. {
  21.     qDebug() << "Table:dragEnterEvent";
  22.     event->acceptProposedAction();
  23. }
  24.  
  25. void Table::dragMoveEvent(QDragMoveEvent* event)
  26. {
  27.     qDebug() << "Table:dragMoveEvent";
  28.     event->acceptProposedAction();
  29. }
  30.  
  31. void Table::dropEvent(QDropEvent* event)
  32. {
  33.     qDebug() << "Table:dropEvent";
  34. }
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I tried different combinations of label->setEnabled(true/false) and label->setAcceptDrops(true, false). I also tried to subclass QLabel and explicitly propagate dragEnterEvent, dragMoveEvent and dropEvent to QTableWidget by calling event->ignore().

Interestingly, the above code works if I replace QTableWidget by QWidget.

Any ideas of a clean Qt solution?
Qt 4.6 tested on Linux and Windows.

Thanks!