QItemDelegate, QDataWidgetMapper and QComboBox

[cydside]

Hi to all,
I'm using a QDialog to edit data from QSqlTableModel through QDataWidgetMapper. Now I've a record field integer that can take only five values but I need to code in text those values and use a QComboBox to do it. So I've thought to implement a QItemDelegate following the example demos/spreadsheet/main.cpp that came with QAssistant but it doesn't work

The attachment is a Snapshot about the Qdialog.

The following code to attempt an explanation :

frmCategorie_AME.h

#ifndef FRMCATEGORIE_AME_H
#define FRMCATEGORIE_AME_H
 
#include <QtGui>
#include <QtSql>
 
#include "ui_frmCategorie_AME.h"
#include "ComboBoxDelegate.h"
 
class frmCategorie_AME : public QDialog
{
  Q_OBJECT
 
public:
  frmCategorie_AME(QSqlTableModel *model, const int &isItNew, QWidget *parent=0);
 
private slots:
   void revert();
   void submit();
 
private:
   Ui::frmCategorie_AME ui;
   QDataWidgetMapper *mapper;
   QSqlTableModel *modelAME;
   int id;
   ComboBoxDelegate boxEU;
};
 
#endif // FRMCATEGORIE_AME_H

#ifndef FRMCATEGORIE_AME_H
#define FRMCATEGORIE_AME_H

#include <QtGui>
#include <QtSql>

#include "ui_frmCategorie_AME.h"
#include "ComboBoxDelegate.h"

class frmCategorie_AME : public QDialog
{
  Q_OBJECT

public:
  frmCategorie_AME(QSqlTableModel *model, const int &isItNew, QWidget *parent=0);

private slots:
   void revert();
   void submit();

private:
   Ui::frmCategorie_AME ui;
   QDataWidgetMapper *mapper;
   QSqlTableModel *modelAME;
   int id;
   ComboBoxDelegate boxEU;
};

#endif // FRMCATEGORIE_AME_H

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frmCategorie_AME.cpp

#include "frmCategorie_AME.h"
 
/*----------------------------------------------------------------------------*/
 
frmCategorie_AME::frmCategorie_AME(QSqlTableModel *model, const int &isItNew,
   QWidget *parent) : QDialog(parent)
{
   ui.setupUi(this);
   this->setWindowFlags(Qt::Dialog | Qt::MSWindowsFixedSizeDialogHint);
   this->setAttribute(Qt::WA_DeleteOnClose);
 
   modelAME = new QSqlTableModel(this);
   modelAME = model;
 
   modelAME->database().transaction();
 
   if (isItNew < 0)
   {
      id = modelAME->rowCount();
      modelAME->insertRow(id);
   }
   else
   {
      id = isItNew;
   }
 
   mapper = new QDataWidgetMapper(this);
   mapper->setModel(modelAME);
   mapper->setSubmitPolicy(QDataWidgetMapper::ManualSubmit);
   mapper->addMapping(ui.lneDescrizione, 1);
   mapper->addMapping(ui.cboText, 2);
   mapper->setCurrentIndex(id);
 
   ui.cboText->setItemDelegate(&boxEU);
 
   connect(ui.btnAnnulla, SIGNAL(clicked()), this, SLOT(revert()));
   connect(ui.btnOk, SIGNAL(clicked()), this, SLOT(submit()));
 
   qDebug() << "frmCategorie_AME Loaded!";
}
 
/*----------------------------------------------------------------------------*/
 
void frmCategorie_AME::revert()
{
   mapper->revert();
   qDebug() << "->frmCategorie_AME Aggiunta Rifiutata!";
   modelAME->revertAll();
   modelAME->database().rollback();
 
   qDebug() << "frmAME closed!";
}
 
/*----------------------------------------------------------------------------*/
 
void frmCategorie_AME::submit()
{
   if (mapper->submit())
   {
      mapper->setCurrentIndex(id);
      qDebug() << "Ok submit!";
 
      if (modelAME->submitAll())
      {
         modelAME->database().commit();
         qDebug() << "Valore eliminato!";
      }
      else
      {
         modelAME->revertAll();
         modelAME->database().rollback();
         QMessageBox::warning(this, tr("Attenzione!"),
            tr("Il database ha riportato un errore: %1")
            .arg(modelAME->lastError().text()));
      }
   }
   else
   {
      qDebug() << "No submit!";
      QMessageBox::warning(this, tr("Attenzione!"),
         tr("Il database ha riportato un errore: %1")
         .arg(modelAME->lastError().text()));
   }
}

#include "frmCategorie_AME.h"

/*----------------------------------------------------------------------------*/

frmCategorie_AME::frmCategorie_AME(QSqlTableModel *model, const int &isItNew,
   QWidget *parent) : QDialog(parent)
{
   ui.setupUi(this);
   this->setWindowFlags(Qt::Dialog | Qt::MSWindowsFixedSizeDialogHint);
   this->setAttribute(Qt::WA_DeleteOnClose);

   modelAME = new QSqlTableModel(this);
   modelAME = model;

   modelAME->database().transaction();

   if (isItNew < 0)
   {
      id = modelAME->rowCount();
      modelAME->insertRow(id);
   }
   else
   {
      id = isItNew;
   }
   
   mapper = new QDataWidgetMapper(this);
   mapper->setModel(modelAME);
   mapper->setSubmitPolicy(QDataWidgetMapper::ManualSubmit);
   mapper->addMapping(ui.lneDescrizione, 1);
   mapper->addMapping(ui.cboText, 2);
   mapper->setCurrentIndex(id);

   ui.cboText->setItemDelegate(&boxEU);

   connect(ui.btnAnnulla, SIGNAL(clicked()), this, SLOT(revert()));
   connect(ui.btnOk, SIGNAL(clicked()), this, SLOT(submit()));

   qDebug() << "frmCategorie_AME Loaded!";
}

/*----------------------------------------------------------------------------*/

void frmCategorie_AME::revert()
{
   mapper->revert();
   qDebug() << "->frmCategorie_AME Aggiunta Rifiutata!";
   modelAME->revertAll();
   modelAME->database().rollback();

   qDebug() << "frmAME closed!";
}

/*----------------------------------------------------------------------------*/

void frmCategorie_AME::submit()
{
   if (mapper->submit())
   {
      mapper->setCurrentIndex(id);
      qDebug() << "Ok submit!";

      if (modelAME->submitAll())
      {
         modelAME->database().commit();
         qDebug() << "Valore eliminato!";
      }
      else
      {
         modelAME->revertAll();
         modelAME->database().rollback();
         QMessageBox::warning(this, tr("Attenzione!"),
            tr("Il database ha riportato un errore: %1")
            .arg(modelAME->lastError().text()));
      }
   }
   else
   {
      qDebug() << "No submit!";
      QMessageBox::warning(this, tr("Attenzione!"),
         tr("Il database ha riportato un errore: %1")
         .arg(modelAME->lastError().text()));
   }
}

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ComboBoxDelegate.h

#ifndef COMBOBOXDELEGATE_H
#define COMBOBOXDELEGATE_H
 
#include <QtGui>
 
class ComboBoxDelegate: public QItemDelegate
{
   public:
      ComboBoxDelegate(QObject *parent = 0);
      QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &,
         const QModelIndex &index) const;
      void setEditorData(QWidget *editor, const QModelIndex &index) const;
      void setModelData(QWidget *editor, QAbstractItemModel *model,
      const QModelIndex &index) const;
 
   private slots:
      void commitAndCloseEditor();
};
 
#endif /* COMBOBOXDELEGATE_H */

#ifndef COMBOBOXDELEGATE_H
#define COMBOBOXDELEGATE_H

#include <QtGui>

class ComboBoxDelegate: public QItemDelegate
{
   public:
      ComboBoxDelegate(QObject *parent = 0);
      QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &,
         const QModelIndex &index) const;
      void setEditorData(QWidget *editor, const QModelIndex &index) const;
      void setModelData(QWidget *editor, QAbstractItemModel *model,
      const QModelIndex &index) const;
      
   private slots:
      void commitAndCloseEditor();
};

#endif /* COMBOBOXDELEGATE_H */

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ComboBoxDelegate.cpp

#include "ComboBoxDelegate.h"
 
/*----------------------------------------------------------------------------*/
 
ComboBoxDelegate::ComboBoxDelegate(QObject *parent)
   : QItemDelegate(parent)
{
   qDebug() << "ComboBoxDelegate Costruttore";
 
}
 
/*----------------------------------------------------------------------------*/
 
QWidget *ComboBoxDelegate::createEditor(QWidget *parent,
   const QStyleOptionViewItem&, const QModelIndex &index) const
{
   QComboBox *editor = new QComboBox(parent);
   editor->addItem("Green", 0);
   editor->addItem("Red", 1);
   editor->addItem("Yellow", 2);
   editor->addItem("Blue", 3);
   editor->addItem("Magenta", 4);
   editor->setCurrentIndex(0);
   return editor;
}
 
/*----------------------------------------------------------------------------*/
 
void ComboBoxDelegate::commitAndCloseEditor()
{
 
   QComboBox *editor = qobject_cast<QComboBox *>(sender());
   emit commitData(editor);
   emit closeEditor(editor);
 
}
 
/*----------------------------------------------------------------------------*/
 
void ComboBoxDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
{
   QComboBox *edit = qobject_cast<QComboBox *>(editor);
   int value = index.model()->data(index, Qt::EditRole).toInt();
   edit->setCurrentIndex(value);
 
}
 
/*----------------------------------------------------------------------------*/
 
void ComboBoxDelegate::setModelData(QWidget *editor, QAbstractItemModel *model,
const QModelIndex &index) const
{
   QComboBox *edit = qobject_cast<QComboBox *>(editor);
   model->setData(index, edit->itemData(edit->currentIndex()));
}

#include "ComboBoxDelegate.h"

/*----------------------------------------------------------------------------*/

ComboBoxDelegate::ComboBoxDelegate(QObject *parent)
   : QItemDelegate(parent)
{
   qDebug() << "ComboBoxDelegate Costruttore";

}

/*----------------------------------------------------------------------------*/

QWidget *ComboBoxDelegate::createEditor(QWidget *parent,
   const QStyleOptionViewItem&, const QModelIndex &index) const
{
   QComboBox *editor = new QComboBox(parent);
   editor->addItem("Green", 0);
   editor->addItem("Red", 1);
   editor->addItem("Yellow", 2);
   editor->addItem("Blue", 3);
   editor->addItem("Magenta", 4);
   editor->setCurrentIndex(0);
   return editor;
}

/*----------------------------------------------------------------------------*/

void ComboBoxDelegate::commitAndCloseEditor()
{

   QComboBox *editor = qobject_cast<QComboBox *>(sender());
   emit commitData(editor);
   emit closeEditor(editor);

}

/*----------------------------------------------------------------------------*/

void ComboBoxDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
{
   QComboBox *edit = qobject_cast<QComboBox *>(editor);
   int value = index.model()->data(index, Qt::EditRole).toInt();
   edit->setCurrentIndex(value);
   
}

/*----------------------------------------------------------------------------*/

void ComboBoxDelegate::setModelData(QWidget *editor, QAbstractItemModel *model,
const QModelIndex &index) const
{
   QComboBox *edit = qobject_cast<QComboBox *>(editor);
   model->setData(index, edit->itemData(edit->currentIndex()));
}

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Thanks in advance!

[wysota]

So what exactly is the problem? What happens when you run the above code?

[cydside]

Is it possible to delegate a QComboBox to show text items instead of integer values?
How can I do it?

PS: QComboBos is mapped with QDataWidgetMapper.
thanks.

[wysota]

Is it possible to delegate a QComboBox to show text items instead of integer values?

Yes.

How can I do it?

By setting the delegate handling setEditorData() and setModelData() on the widget mapper. From what I see you have set it on the combobox instead of the data widget mapper.

[cydside]

Ok, I'm in the mess. So I've tried to delegate the QDataWidgetMapper ('mapper' in the code) as following:

mapper = new QDataWidgetMapper(this);
   mapper->setModel(modelAME);
   mapper->setSubmitPolicy(QDataWidgetMapper::ManualSubmit);
   mapper->addMapping(ui.lneDescrizione, 1); //lneDescrizione is a QLineEdit
   mapper->addMapping(ui.cboText, 2); //cbotext is a QComboBox
   mapper->setItemDelegate(&boxEU); //ComboBoxDelegate boxEU; from frmCategorie_AME.h
   mapper->setCurrentIndex(id);

mapper = new QDataWidgetMapper(this);
   mapper->setModel(modelAME);
   mapper->setSubmitPolicy(QDataWidgetMapper::ManualSubmit);
   mapper->addMapping(ui.lneDescrizione, 1); //lneDescrizione is a QLineEdit
   mapper->addMapping(ui.cboText, 2); //cbotext is a QComboBox
   mapper->setItemDelegate(&boxEU); //ComboBoxDelegate boxEU; from frmCategorie_AME.h
   mapper->setCurrentIndex(id);

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but it doesn't work!
I'm sorry, missing somthing...

[wysota]

Did you change setEditorData() and setModelData() of the delegate? The ones you posted before should have segfaulted your application.

[cydside]

Ok, now I think to be closer to a solution...
I've read this article http://doc.trolltech.com/qq/qq21-datawidgetmapper.html and the chapter "Using Delegates to Offer Choices" maybe will be useful!
According to the previous article I changed the code as following:

frmCategorie_AME.h

#ifndef FRMCATEGORIE_AME_H
#define FRMCATEGORIE_AME_H
 
#include <QtGui>
#include <QtSql>
 
#include "ui_frmCategorie_AME.h"
#include "ComboBoxDelegate.h"
 
class frmCategorie_AME : public QDialog
{
  Q_OBJECT
 
public:
  frmCategorie_AME(QSqlTableModel *model, const int &isItNew, QWidget *parent=0);
  void setLabel(const QString &text);
 
private slots:
   void revert();
   void submit();
 
private:
   Ui::frmCategorie_AME ui;
   QDataWidgetMapper *mapper;
   QSqlTableModel *modelAME;
   int id;
};
#endif // FRMCATEGORIE_AME_H

#ifndef FRMCATEGORIE_AME_H
#define FRMCATEGORIE_AME_H

#include <QtGui>
#include <QtSql>

#include "ui_frmCategorie_AME.h"
#include "ComboBoxDelegate.h"

class frmCategorie_AME : public QDialog
{
  Q_OBJECT

public:
  frmCategorie_AME(QSqlTableModel *model, const int &isItNew, QWidget *parent=0);
  void setLabel(const QString &text);

private slots:
   void revert();
   void submit();

private:
   Ui::frmCategorie_AME ui;
   QDataWidgetMapper *mapper;
   QSqlTableModel *modelAME;
   int id;
};
#endif // FRMCATEGORIE_AME_H

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frmCategorie.cpp

#include "frmCategorie_AME.h"
 
/*----------------------------------------------------------------------------*/
 
frmCategorie_AME::frmCategorie_AME(QSqlTableModel *model, const int &isItNew,
   QWidget *parent) : QDialog(parent)
{
   ui.setupUi(this);
   this->setWindowFlags(Qt::Dialog | Qt::MSWindowsFixedSizeDialogHint);
   this->setAttribute(Qt::WA_DeleteOnClose);
 
   modelAME = new QSqlTableModel(this);
   modelAME = model;
 
   modelAME->database().transaction();
 
   if (isItNew < 0)
   {
      id = modelAME->rowCount();
      modelAME->insertRow(id);
   }
   else
   {
      id = isItNew;
   }
 
   QStringList items;
   QStringListModel *typeModel;
   items << tr("Green") << tr("Red");
   typeModel = new QStringListModel(items, this);
   ui.cboText->setModel(typeModel);
 
   mapper = new QDataWidgetMapper(this);
   mapper->setModel(modelAME);
   mapper->setItemDelegate(new ComboBoxDelegate(this));
   mapper->setSubmitPolicy(QDataWidgetMapper::ManualSubmit);
   mapper->addMapping(ui.lneDescrizione, 1);
   mapper->addMapping(ui.cboText, 2);
   mapper->setCurrentIndex(id);
 
   connect(ui.btnAnnulla, SIGNAL(clicked()), this, SLOT(revert()));
   connect(ui.btnOk, SIGNAL(clicked()), this, SLOT(submit()));
 
   qDebug() << "frmCategorie_AME Loaded!";
}
 
/*----------------------------------------------------------------------------*/
 
void frmCategorie_AME::setLabel(const QString &text)
{
   qDebug() << "frmAME->setLabel";
 
   ui.lblValore->setText(text.toUtf8());
}
 
/*----------------------------------------------------------------------------*/
 
void frmCategorie_AME::revert()
{
   mapper->revert();
   qDebug() << "->frmCategorie_AME (Aggiunta Rifiutata!";
   modelAME->revertAll();
   modelAME->database().rollback();
 
   qDebug() << "frmAME closed!";
}
 
/*----------------------------------------------------------------------------*/
 
void frmCategorie_AME::submit()
{
   if (mapper->submit())
   {
      mapper->setCurrentIndex(id);
      qDebug() << "Ok submit!";
 
      if (modelAME->submitAll())
      {
         modelAME->database().commit();
         qDebug() << "Valore eliminato!";
      }
      else
      {
         modelAME->revertAll();
         modelAME->database().rollback();
         QMessageBox::warning(this, tr("Attenzione!"),
            tr("Il database ha riportato un errore: %1")
            .arg(modelAME->lastError().text()));
      }
   }
   else
   {
      qDebug() << "No submit!";
      QMessageBox::warning(this, tr("Attenzione!"),
         tr("Il database ha riportato un errore: %1")
         .arg(modelAME->lastError().text()));
   }
}

#include "frmCategorie_AME.h"

/*----------------------------------------------------------------------------*/

frmCategorie_AME::frmCategorie_AME(QSqlTableModel *model, const int &isItNew,
   QWidget *parent) : QDialog(parent)
{
   ui.setupUi(this);
   this->setWindowFlags(Qt::Dialog | Qt::MSWindowsFixedSizeDialogHint);
   this->setAttribute(Qt::WA_DeleteOnClose);

   modelAME = new QSqlTableModel(this);
   modelAME = model;

   modelAME->database().transaction();

   if (isItNew < 0)
   {
      id = modelAME->rowCount();
      modelAME->insertRow(id);
   }
   else
   {
      id = isItNew;
   }
   
   QStringList items;
   QStringListModel *typeModel;
   items << tr("Green") << tr("Red");
   typeModel = new QStringListModel(items, this);
   ui.cboText->setModel(typeModel);
   
   mapper = new QDataWidgetMapper(this);
   mapper->setModel(modelAME);
   mapper->setItemDelegate(new ComboBoxDelegate(this));
   mapper->setSubmitPolicy(QDataWidgetMapper::ManualSubmit);
   mapper->addMapping(ui.lneDescrizione, 1);
   mapper->addMapping(ui.cboText, 2);
   mapper->setCurrentIndex(id);

   connect(ui.btnAnnulla, SIGNAL(clicked()), this, SLOT(revert()));
   connect(ui.btnOk, SIGNAL(clicked()), this, SLOT(submit()));

   qDebug() << "frmCategorie_AME Loaded!";
}

/*----------------------------------------------------------------------------*/

void frmCategorie_AME::setLabel(const QString &text)
{
   qDebug() << "frmAME->setLabel";

   ui.lblValore->setText(text.toUtf8());
}

/*----------------------------------------------------------------------------*/

void frmCategorie_AME::revert()
{
   mapper->revert();
   qDebug() << "->frmCategorie_AME (Aggiunta Rifiutata!";
   modelAME->revertAll();
   modelAME->database().rollback();

   qDebug() << "frmAME closed!";
}

/*----------------------------------------------------------------------------*/

void frmCategorie_AME::submit()
{
   if (mapper->submit())
   {
      mapper->setCurrentIndex(id);
      qDebug() << "Ok submit!";

      if (modelAME->submitAll())
      {
         modelAME->database().commit();
         qDebug() << "Valore eliminato!";
      }
      else
      {
         modelAME->revertAll();
         modelAME->database().rollback();
         QMessageBox::warning(this, tr("Attenzione!"),
            tr("Il database ha riportato un errore: %1")
            .arg(modelAME->lastError().text()));
      }
   }
   else
   {
      qDebug() << "No submit!";
      QMessageBox::warning(this, tr("Attenzione!"),
         tr("Il database ha riportato un errore: %1")
         .arg(modelAME->lastError().text()));
   }
}

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ComboBoxDelegate.h

#ifndef COMBOBOXDELEGATE_H
#define COMBOBOXDELEGATE_H
 
#include <QItemDelegate>
 
class ComboBoxDelegate : public QItemDelegate
{
      Q_OBJECT
   public:
      ComboBoxDelegate(QObject *parent = 0);
      void setEditorData(QWidget *editor, const QModelIndex &index) const;
      void setModelData(QWidget *editor, QAbstractItemModel *model,
         const QModelIndex &index) const;
};
#endif /* COMBOBOXDELEGATE_H */

#ifndef COMBOBOXDELEGATE_H
#define COMBOBOXDELEGATE_H

#include <QItemDelegate>

class ComboBoxDelegate : public QItemDelegate
{
      Q_OBJECT
   public:
      ComboBoxDelegate(QObject *parent = 0);
      void setEditorData(QWidget *editor, const QModelIndex &index) const;
      void setModelData(QWidget *editor, QAbstractItemModel *model,
         const QModelIndex &index) const;
};
#endif /* COMBOBOXDELEGATE_H */

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ComboBoxDelegate.cpp

#include <QtGui>
#include "ComboBoxDelegate.h"
 
/*----------------------------------------------------------------------------*/
 
ComboBoxDelegate::ComboBoxDelegate(QObject *parent) : QItemDelegate(parent)
{
 
}
 
/*----------------------------------------------------------------------------*/
 
void ComboBoxDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
{
   if (!editor->metaObject()->userProperty().isValid())
   {
      if (editor->property("currentIndex").isValid())
      {
         editor->setProperty("currentIndex", index.data());
         return;
      }
   }
   QItemDelegate::setEditorData(editor, index);
}
 
/*----------------------------------------------------------------------------*/
 
void ComboBoxDelegate::setModelData(QWidget *editor, QAbstractItemModel *model,
   const QModelIndex &index) const
{
   if (!editor->metaObject()->userProperty().isValid())
   {
      QVariant value = editor->property("currentIndex");
      if (value.isValid())
      {
         model->setData(index, value);
         return;
      }
   }
   QItemDelegate::setModelData(editor, model, index);
}

#include <QtGui>
#include "ComboBoxDelegate.h"

/*----------------------------------------------------------------------------*/

ComboBoxDelegate::ComboBoxDelegate(QObject *parent) : QItemDelegate(parent)
{

}

/*----------------------------------------------------------------------------*/

void ComboBoxDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
{
   if (!editor->metaObject()->userProperty().isValid())
   {
      if (editor->property("currentIndex").isValid())
      {
         editor->setProperty("currentIndex", index.data());
         return;
      }
   }
   QItemDelegate::setEditorData(editor, index);
}

/*----------------------------------------------------------------------------*/

void ComboBoxDelegate::setModelData(QWidget *editor, QAbstractItemModel *model,
   const QModelIndex &index) const
{
   if (!editor->metaObject()->userProperty().isValid())
   {
      QVariant value = editor->property("currentIndex");
      if (value.isValid())
      {
         model->setData(index, value);
         return;
      }
   }
   QItemDelegate::setModelData(editor, model, index);
}

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but I'm havinga strange compiler error:

./debug\ComboBoxDelegate.o: In function `ZN16ComboBoxDelegateC2EP7QObject':
D:/DEV_QT/GESCON_STD/project/src/ComboBoxDelegate.cpp:21: undefined reference to `vtable for ComboBoxDelegate'
./debug\ComboBoxDelegate.o: In function `ZN16ComboBoxDelegateC1EP7QObject':
D:/DEV_QT/GESCON_STD/project/src/ComboBoxDelegate.cpp:21: undefined reference to `vtable for ComboBoxDelegate'

Unbeliveble!!!

[cydside]

Ok, the previous code works perfectly, the compiler error showed in the last post dues to incorrect end of line(CRLF for Win and LF for UNIX)!
Thanks to wysota!!!