boolean field checkbox QTableView

Hello,
I have a QTableView with a QSqlRelationalTableModel and i want the boolean colums to be checkboxes in display and edit, I have searching the forum but i have not understand the full picture here i think, i have tried two ways to do that:

-Create a QItemDelegate subclass and reimplement the methods createEditor, setEditorData, setModelData and updateEditorGeometry to represent a checkbox on edit.

-Create a QSortProxyModel subclass and reimplement flags to add a Qt.ItemIsUserCheckable on the boolean column an check for Qt::CheckStateRole in data method to reply with the boolean value of the column.

If i use the sortproxymodel i get the checkbox in display with the correct values but i still see the "true, false" strings and to change the value i get a combobox with the values true or false.

If i use the delegate i get the checkbox to edit on doble click but i dont see checkboxes in display mode, only my well know "true, false" strings.

If i use the delegate and the sortproxymodel i get a checkbox on the left of the cell on display mode and when i try to change the value i see other checkbox at the right of the first where i can change the value, after i commit the change the second checkbox is gone and the left display checkbox shows the change.

Do i have any way to have a checkbox column in display and edit (the same) and not see the text "true, false"?

Thanks in advance.

With a little help from qt-interest mailinglist i have get the effect i want, and without use persistenteditor or delegate, i have subclassed QSortFilterProxyModel and react there to Qt.CheckStateRole, because i am using the same model in one QDataWidgetMapper, i paste the code here to anyone with this problem in the future, is is python but easily interpretable.

Code:

---

class GenericSortProxyModel(QSortFilterProxyModel):
    def __init__(self, parent):
        super(GenericSortProxyModel, self).__init__()
        self.booleanSet = set()
        self.nullVariant = QVariant()
 
    def setParametros(self, booleanColumns=None):
        if booleanColumns:
            for columna in booleanColumns:
                self.booleanSet.add(columna)
 
    def flags(self, index):
        if not index.isValid():
            return Qt.ItemIsEnabled
 
        if index.column() in self.booleanSet:
            return Qt.ItemIsUserCheckable | Qt.ItemIsSelectable | Qt.ItemIsEnabled
        else:
            return QSortFilterProxyModel.flags(self, index)
 
    def data(self, index, role):
        if not index.isValid():
            return self.nullVariant()
 
        if index.column() in self.booleanSet and role in (Qt.CheckStateRole, Qt.DisplayRole):
            if role == Qt.CheckStateRole:
                value = QVariant(Qt.Checked) if index.data(Qt.EditRole).toBool() else QVariant(Qt.Unchecked)
                return value
            else: #if role == Qt.DisplayRole:
                return self.nullVariant
        else:
            return QSortFilterProxyModel.data(self, index, role)
 
    def setData(self, index, data, role):
        if not index.isValid():
            return False
 
        if index.column() in self.booleanSet and role == Qt.CheckStateRole:
            value = QVariant(True) if data.toInt()[0] == Qt.Checked else QVariant(False)
            return QSortFilterProxyModel.setData(self, index, value, Qt.EditRole)
        else:
            return QSortFilterProxyModel.setData(self, index, data, role)

---

in C++ syntax:
genericsortproxymodel.h content:

Code:

---

#ifndef GENERICSORTPROXYMODEL_H
#define GENERICSORTPROXYMODEL_H
 
#include <QSortFilterProxyModel>
 
class GenericSortProxyModel : public QSortFilterProxyModel
{
public:
    GenericSortProxyModel(QObject *parent=0);
    void setparametros(QList<bool> booleanColumns);
protected:
    virtual Qt::ItemFlags flags ( const QModelIndex & index ) const;
    virtual QVariant	data ( const QModelIndex & index, int role ) const;
    virtual bool	setData ( const QModelIndex & index, const QVariant & value, int role );
 
private:
    QList<bool> booleanSet;
    QVariant nullVariant;
 
};
 
#endif // GENERICSORTPROXYMODEL_H

---

genericsortproxymodel.cpp content:

Code:

---

#include "genericsortproxymodel.h"
 
GenericSortProxyModel::GenericSortProxyModel(QObject *parent)
    :QSortFilterProxyModel(parent)
{
 
}
void GenericSortProxyModel::setparametros(QList<bool> booleanColumns)
{
    if(!booleanColumns.empty())
    foreach(bool column , booleanColumns)
    {
        this->booleanSet.append(column);
    }
 
}
 
 Qt::ItemFlags	GenericSortProxyModel::flags ( const QModelIndex & index ) const
{
 
    if(!index.isValid())
        return Qt::ItemIsEnabled;
    if(booleanSet.value(index.column()))
        return Qt::ItemIsUserCheckable | Qt::ItemIsSelectable | Qt::ItemIsEnabled;
    else
        return QSortFilterProxyModel::flags(index);
}
 
 QVariant	GenericSortProxyModel::data ( const QModelIndex & index, int role = Qt::DisplayRole ) const
{
    if(!index.isValid())
        return this->nullVariant;
    if(booleanSet.value(index.column()) && (role==Qt::CheckStateRole || role==Qt::DisplayRole))    {
        if(role==Qt::CheckStateRole)        
            return index.data(Qt::EditRole).toBool()?QVariant(Qt::Checked):QVariant(Qt::Unchecked);
        else if(role==Qt::DisplayRole)
            return this->nullVariant;
    }
    else
        return QSortFilterProxyModel::data(index,role);
 
}
 bool	GenericSortProxyModel::setData ( const QModelIndex & index, const QVariant & value, int role = Qt::EditRole )
{
    if(!index.isValid())
        return false;
    if(booleanSet.value(index.column()) && role==Qt::CheckStateRole)
    {
        QVariant data= value.toInt()==Qt::Checked?QVariant(true):QVariant(false);
        return QSortFilterProxyModel::setData(index,data,Qt::EditRole);
    }
    else
        return QSortFilterProxyModel::setData(index,value,role);
}

---

and use in main.cpp :

Code:

---

....
QList<bool> chkCols;
         // fields that should be checkbox are 1
    chkCols<<0<<0<<0<<0<<0<<0<<0<<0<<0<<1;
    proxyModel->setparametros(chkCols);
    proxyModel->setSourceModel(model);
    ui->tableView->setModel(proxyModel);
....

---

but using proxy, this code doesnt work anymore!(relations are lost) :

Code:

---

ui->tableView->setItemDelegate(new QSqlRelationalDelegate(ui->tableView));

---

does anyone know solution?

Sorry, i've wrong :confused: