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  1. 8th April 2009, 18:06 #1
    cydside
    cydside is offline Intermediate user
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    Default Re: QItemDelegate, QDataWidgetMapper and QComboBox

    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

    Qt Code: 
    1. #ifndef FRMCATEGORIE_AME_H
    2. #define FRMCATEGORIE_AME_H
    3.  
    4. #include <QtGui>
    5. #include <QtSql>
    6.  
    7. #include "ui_frmCategorie_AME.h"
    8. #include "ComboBoxDelegate.h"
    9.  
    10. class frmCategorie_AME : public QDialog
    11. {
    12.   Q_OBJECT
    13.  
    14. public:
    15.   frmCategorie_AME(QSqlTableModel *model, const int &isItNew, QWidget *parent=0);
    16.   void setLabel(const QString &text);
    17.  
    18. private slots:
    19.    void revert();
    20.    void submit();
    21.  
    22. private:
    23.    Ui::frmCategorie_AME ui;
    25.    QSqlTableModel *modelAME;
    26.    int id;
    27. };
    28. #endif // FRMCATEGORIE_AME_H
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    frmCategorie.cpp

    Qt Code: 
    1. #include "frmCategorie_AME.h"
    2.  
    3. /*----------------------------------------------------------------------------*/
    4.  
    5. frmCategorie_AME::frmCategorie_AME(QSqlTableModel *model, const int &isItNew,
    6.    QWidget *parent) : QDialog(parent)
    7. {
    8.    ui.setupUi(this);
    9.    this->setWindowFlags(Qt::Dialog | Qt::MSWindowsFixedSizeDialogHint);
    10.    this->setAttribute(Qt::WA_DeleteOnClose);
    11.  
    12.    modelAME = new QSqlTableModel(this);
    13.    modelAME = model;
    14.  
    15.    modelAME->database().transaction();
    16.  
    17.    if (isItNew < 0)
    18.    {
    19.       id = modelAME->rowCount();
    20.       modelAME->insertRow(id);
    21.    }
    22.    else
    23.    {
    24.       id = isItNew;
    25.    }
    26.  
    27.    QStringList items;
    28.    QStringListModel *typeModel;
    29.    items << tr("Green") << tr("Red");
    30.    typeModel = new QStringListModel(items, this);
    31.    ui.cboText->setModel(typeModel);
    32.  
    33.    mapper = new QDataWidgetMapper(this);
    34.    mapper->setModel(modelAME);
    35.    mapper->setItemDelegate(new ComboBoxDelegate(this));
    36.    mapper->setSubmitPolicy(QDataWidgetMapper::ManualSubmit);
    37.    mapper->addMapping(ui.lneDescrizione, 1);
    38.    mapper->addMapping(ui.cboText, 2);
    39.    mapper->setCurrentIndex(id);
    40.  
    41.    connect(ui.btnAnnulla, SIGNAL(clicked()), this, SLOT(revert()));
    42.    connect(ui.btnOk, SIGNAL(clicked()), this, SLOT(submit()));
    43.  
    44.    qDebug() << "frmCategorie_AME Loaded!";
    45. }
    46.  
    47. /*----------------------------------------------------------------------------*/
    48.  
    49. void frmCategorie_AME::setLabel(const QString &text)
    50. {
    51.    qDebug() << "frmAME->setLabel";
    52.  
    53.    ui.lblValore->setText(text.toUtf8());
    54. }
    55.  
    56. /*----------------------------------------------------------------------------*/
    57.  
    58. void frmCategorie_AME::revert()
    59. {
    60.    mapper->revert();
    61.    qDebug() << "->frmCategorie_AME (Aggiunta Rifiutata!";
    62.    modelAME->revertAll();
    63.    modelAME->database().rollback();
    64.  
    65.    qDebug() << "frmAME closed!";
    66. }
    67.  
    68. /*----------------------------------------------------------------------------*/
    69.  
    70. void frmCategorie_AME::submit()
    71. {
    72.    if (mapper->submit())
    73.    {
    74.       mapper->setCurrentIndex(id);
    75.       qDebug() << "Ok submit!";
    76.  
    77.       if (modelAME->submitAll())
    78.       {
    79.          modelAME->database().commit();
    80.          qDebug() << "Valore eliminato!";
    81.       }
    82.       else
    83.       {
    84.          modelAME->revertAll();
    85.          modelAME->database().rollback();
    86.          QMessageBox::warning(this, tr("Attenzione!"),
    87.             tr("Il database ha riportato un errore: %1")
    88.             .arg(modelAME->lastError().text()));
    89.       }
    90.    }
    91.    else
    92.    {
    93.       qDebug() << "No submit!";
    94.       QMessageBox::warning(this, tr("Attenzione!"),
    95.          tr("Il database ha riportato un errore: %1")
    96.          .arg(modelAME->lastError().text()));
    97.    }
    98. }
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    ComboBoxDelegate.h

    Qt Code: 
    1. #ifndef COMBOBOXDELEGATE_H
    2. #define COMBOBOXDELEGATE_H
    3.  
    4. #include <QItemDelegate>
    5.  
    6. class ComboBoxDelegate : public QItemDelegate
    7. {
    8.       Q_OBJECT
    9.    public:
    10.       ComboBoxDelegate(QObject *parent = 0);
    11.       void setEditorData(QWidget *editor, const QModelIndex &index) const;
    12.       void setModelData(QWidget *editor, QAbstractItemModel *model,
    13.          const QModelIndex &index) const;
    14. };
    15. #endif /* COMBOBOXDELEGATE_H */
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    ComboBoxDelegate.cpp

    Qt Code: 
    1. #include <QtGui>
    2. #include "ComboBoxDelegate.h"
    3.  
    4. /*----------------------------------------------------------------------------*/
    5.  
    6. ComboBoxDelegate::ComboBoxDelegate(QObject *parent) : QItemDelegate(parent)
    7. {
    8.  
    9. }
    10.  
    11. /*----------------------------------------------------------------------------*/
    12.  
    13. void ComboBoxDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
    14. {
    15.    if (!editor->metaObject()->userProperty().isValid())
    16.    {
    17.       if (editor->property("currentIndex").isValid())
    18.       {
    19.          editor->setProperty("currentIndex", index.data());
    20.          return;
    21.       }
    22.    }
    23.    QItemDelegate::setEditorData(editor, index);
    24. }
    25.  
    26. /*----------------------------------------------------------------------------*/
    27.  
    28. void ComboBoxDelegate::setModelData(QWidget *editor, QAbstractItemModel *model,
    29.    const QModelIndex &index) const
    30. {
    31.    if (!editor->metaObject()->userProperty().isValid())
    32.    {
    33.       QVariant value = editor->property("currentIndex");
    34.       if (value.isValid())
    35.       {
    36.          model->setData(index, value);
    37.          return;
    38.       }
    39.    }
    40.    QItemDelegate::setModelData(editor, model, index);
    41. }
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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!!!
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  2. 8th April 2009, 19:44 #2
    cydside
    cydside is offline Intermediate user
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    Smile Re: QItemDelegate, QDataWidgetMapper and QComboBox

    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!!!
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