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Thread: QItemDelegate, QDataWidgetMapper and QComboBox

  1. #1
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    Default QItemDelegate, QDataWidgetMapper and QComboBox

    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
    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.  
    17. private slots:
    18. void revert();
    19. void submit();
    20.  
    21. private:
    22. Ui::frmCategorie_AME ui;
    23. QSqlTableModel *modelAME;
    24. int id;
    25. ComboBoxDelegate boxEU;
    26. };
    27.  
    28. #endif // FRMCATEGORIE_AME_H
    To copy to clipboard, switch view to plain text mode 

    frmCategorie_AME.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. mapper = new QDataWidgetMapper(this);
    28. mapper->setModel(modelAME);
    29. mapper->setSubmitPolicy(QDataWidgetMapper::ManualSubmit);
    30. mapper->addMapping(ui.lneDescrizione, 1);
    31. mapper->addMapping(ui.cboText, 2);
    32. mapper->setCurrentIndex(id);
    33.  
    34. ui.cboText->setItemDelegate(&boxEU);
    35.  
    36. connect(ui.btnAnnulla, SIGNAL(clicked()), this, SLOT(revert()));
    37. connect(ui.btnOk, SIGNAL(clicked()), this, SLOT(submit()));
    38.  
    39. qDebug() << "frmCategorie_AME Loaded!";
    40. }
    41.  
    42. /*----------------------------------------------------------------------------*/
    43.  
    44. void frmCategorie_AME::revert()
    45. {
    46. mapper->revert();
    47. qDebug() << "->frmCategorie_AME Aggiunta Rifiutata!";
    48. modelAME->revertAll();
    49. modelAME->database().rollback();
    50.  
    51. qDebug() << "frmAME closed!";
    52. }
    53.  
    54. /*----------------------------------------------------------------------------*/
    55.  
    56. void frmCategorie_AME::submit()
    57. {
    58. if (mapper->submit())
    59. {
    60. mapper->setCurrentIndex(id);
    61. qDebug() << "Ok submit!";
    62.  
    63. if (modelAME->submitAll())
    64. {
    65. modelAME->database().commit();
    66. qDebug() << "Valore eliminato!";
    67. }
    68. else
    69. {
    70. modelAME->revertAll();
    71. modelAME->database().rollback();
    72. QMessageBox::warning(this, tr("Attenzione!"),
    73. tr("Il database ha riportato un errore: %1")
    74. .arg(modelAME->lastError().text()));
    75. }
    76. }
    77. else
    78. {
    79. qDebug() << "No submit!";
    80. QMessageBox::warning(this, tr("Attenzione!"),
    81. tr("Il database ha riportato un errore: %1")
    82. .arg(modelAME->lastError().text()));
    83. }
    84. }
    To copy to clipboard, switch view to plain text mode 

    ComboBoxDelegate.h
    Qt Code:
    1. #ifndef COMBOBOXDELEGATE_H
    2. #define COMBOBOXDELEGATE_H
    3.  
    4. #include <QtGui>
    5.  
    6. class ComboBoxDelegate: public QItemDelegate
    7. {
    8. public:
    9. ComboBoxDelegate(QObject *parent = 0);
    10. QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &,
    11. const QModelIndex &index) const;
    12. void setEditorData(QWidget *editor, const QModelIndex &index) const;
    13. void setModelData(QWidget *editor, QAbstractItemModel *model,
    14. const QModelIndex &index) const;
    15.  
    16. private slots:
    17. void commitAndCloseEditor();
    18. };
    19.  
    20. #endif /* COMBOBOXDELEGATE_H */
    To copy to clipboard, switch view to plain text mode 

    ComboBoxDelegate.cpp

    Qt Code:
    1. #include "ComboBoxDelegate.h"
    2.  
    3. /*----------------------------------------------------------------------------*/
    4.  
    5. ComboBoxDelegate::ComboBoxDelegate(QObject *parent)
    6. : QItemDelegate(parent)
    7. {
    8. qDebug() << "ComboBoxDelegate Costruttore";
    9.  
    10. }
    11.  
    12. /*----------------------------------------------------------------------------*/
    13.  
    14. QWidget *ComboBoxDelegate::createEditor(QWidget *parent,
    15. const QStyleOptionViewItem&, const QModelIndex &index) const
    16. {
    17. QComboBox *editor = new QComboBox(parent);
    18. editor->addItem("Green", 0);
    19. editor->addItem("Red", 1);
    20. editor->addItem("Yellow", 2);
    21. editor->addItem("Blue", 3);
    22. editor->addItem("Magenta", 4);
    23. editor->setCurrentIndex(0);
    24. return editor;
    25. }
    26.  
    27. /*----------------------------------------------------------------------------*/
    28.  
    29. void ComboBoxDelegate::commitAndCloseEditor()
    30. {
    31.  
    32. QComboBox *editor = qobject_cast<QComboBox *>(sender());
    33. emit commitData(editor);
    34. emit closeEditor(editor);
    35.  
    36. }
    37.  
    38. /*----------------------------------------------------------------------------*/
    39.  
    40. void ComboBoxDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
    41. {
    42. QComboBox *edit = qobject_cast<QComboBox *>(editor);
    43. int value = index.model()->data(index, Qt::EditRole).toInt();
    44. edit->setCurrentIndex(value);
    45.  
    46. }
    47.  
    48. /*----------------------------------------------------------------------------*/
    49.  
    50. void ComboBoxDelegate::setModelData(QWidget *editor, QAbstractItemModel *model,
    51. const QModelIndex &index) const
    52. {
    53. QComboBox *edit = qobject_cast<QComboBox *>(editor);
    54. model->setData(index, edit->itemData(edit->currentIndex()));
    55. }
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    Thanks in advance!
    Attached Images Attached Images

  2. #2
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    Default Re: QItemDelegate, QDataWidgetMapper and QComboBox

    So what exactly is the problem? What happens when you run the above code?
    Your biological and technological distinctiveness will be added to our own. Resistance is futile.

    Please ask Qt related questions on the forum and not using private messages or visitor messages.


  3. #3
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    Default Re: QItemDelegate, QDataWidgetMapper and QComboBox

    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.

  4. #4
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    Default Re: QItemDelegate, QDataWidgetMapper and QComboBox

    Quote Originally Posted by cydside View Post
    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.
    Your biological and technological distinctiveness will be added to our own. Resistance is futile.

    Please ask Qt related questions on the forum and not using private messages or visitor messages.


  5. #5
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    Default Re: QItemDelegate, QDataWidgetMapper and QComboBox

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

    Qt Code:
    1. mapper = new QDataWidgetMapper(this);
    2. mapper->setModel(modelAME);
    3. mapper->setSubmitPolicy(QDataWidgetMapper::ManualSubmit);
    4. mapper->addMapping(ui.lneDescrizione, 1); //lneDescrizione is a QLineEdit
    5. mapper->addMapping(ui.cboText, 2); //cbotext is a QComboBox
    6. mapper->setItemDelegate(&boxEU); //ComboBoxDelegate boxEU; from frmCategorie_AME.h
    7. mapper->setCurrentIndex(id);
    To copy to clipboard, switch view to plain text mode 

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

  6. #6
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    Default Re: QItemDelegate, QDataWidgetMapper and QComboBox

    Did you change setEditorData() and setModelData() of the delegate? The ones you posted before should have segfaulted your application.
    Your biological and technological distinctiveness will be added to our own. Resistance is futile.

    Please ask Qt related questions on the forum and not using private messages or visitor messages.


  7. #7
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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;
    24. QSqlTableModel *modelAME;
    25. int id;
    26. };
    27. #endif // FRMCATEGORIE_AME_H
    To copy to clipboard, switch view to plain text mode 

    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. }
    To copy to clipboard, switch view to plain text mode 

    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 */
    To copy to clipboard, switch view to plain text mode 

    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. }
    To copy to clipboard, switch view to plain text mode 

    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!!!

  8. #8
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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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