QComboBox in QTreeView

[mugi]

Hey Everyone,
I have a QTreeView that uses a QAbstractItemModel.
I want Column 8.to use ComboBoxes, so I implemented a new delegate, but when compiling this error comes out: undefined reference to `ComboDelegate::ComboDelegate(QObject*)'

Here is my code:

/*TreeView*/
....
#include <QtGui>
#include "ComboDelegate.h"
.....
/*Error*/ ComboDelegate* delegate = new ComboDelegate();
TreeView->setItemDelegateForColumn(8, delegate);

/*TreeView*/
....
#include <QtGui>
#include "ComboDelegate.h"
.....
/*Error*/ ComboDelegate* delegate = new ComboDelegate();
TreeView->setItemDelegateForColumn(8, delegate);

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/*delegate.h*/
...
class ComboDelegate : public QItemDelegate
{
    Q_OBJECT
    public:
 
          ComboDelegate(QObject *parent = 0);
          QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const;
          void setEditorData(QWidget *editor, const QModelIndex &index) const;
          void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const;
          void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const;
};
 
#endif

/*delegate.h*/
...
class ComboDelegate : public QItemDelegate
{
    Q_OBJECT
    public:

          ComboDelegate(QObject *parent = 0);
          QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const;
          void setEditorData(QWidget *editor, const QModelIndex &index) const;
          void setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const;
          void updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const;
};

#endif

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/*delegate.cpp*/
#include "ComboDelegate.h"
 
ComboDelegate::ComboDelegate(QObject *parent): QItemDelegate(parent)
{
}
 
QWidget *ComboDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &/* option */, const QModelIndex &/* index */) const
{
     QComboBox *editor = new QComboBox(parent);
     QStringList list ;
     list << "a" << "b" << "c" << "d";
     editor->addItems(list);
     return editor;
}
 
void ComboDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
{
     QString value = index.model()->data(index, Qt::DisplayRole).toString();
     QComboBox *comboBox = static_cast<QComboBox*>(editor);
     comboBox->addItem(value);
}
 
void ComboDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const
{
     QComboBox *comboBox = static_cast<QComboBox*>(editor);
     QString value = comboBox->currentText();
     model->setData(index, value);
}
 
void ComboDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &/* index */) const
{
editor->setGeometry(option.rect);
}

/*delegate.cpp*/
#include "ComboDelegate.h"

ComboDelegate::ComboDelegate(QObject *parent): QItemDelegate(parent)
{
}
        
QWidget *ComboDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &/* option */, const QModelIndex &/* index */) const
{
     QComboBox *editor = new QComboBox(parent);
     QStringList list ;
     list << "a" << "b" << "c" << "d";
     editor->addItems(list);
     return editor;
}
        
void ComboDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
{
     QString value = index.model()->data(index, Qt::DisplayRole).toString();
     QComboBox *comboBox = static_cast<QComboBox*>(editor);
     comboBox->addItem(value);
}
        
void ComboDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const
{
     QComboBox *comboBox = static_cast<QComboBox*>(editor);
     QString value = comboBox->currentText();
     model->setData(index, value);
}
        
void ComboDelegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &/* index */) const
{
editor->setGeometry(option.rect);
}

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Any suggestions ??

[mugi]

it works, I just forgot an Include in the .pro.

[qtCuckoo]

Hi,

I know this thread is almost a year old but could you post a working example of how to load a Combobox into a TreeView?
I'm quite new to the Qt World and I'm trying to do exactly what you did.

Thanks in advance.