[QT4 & XP] QTreeView issue with Designer form

[incapacitant]

I have this problem with the code below, that when I double click on an row, then nothing happens. I have written about the same code without a designer form and it works. I must be doing several things wrong in the designer form reuse.

Can you point out the where the trouble(s) is(are) :

main.cpp

#include <QtCore>
#include <QtGui>
 
#include "dialog.h"
 
int main(int argc, char *argv[])
{
  QApplication app(argc, argv);
  Dialog *window = new Dialog;
  window->show();
  return app.exec();
}

#include <QtCore>
#include <QtGui>

#include "dialog.h"

int main(int argc, char *argv[])
{
  QApplication app(argc, argv);
  Dialog *window = new Dialog;
  window->show();
  return app.exec();
}

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dialog.h

#include "ui_dialog.h"
#include <QStandardItemModel>
 
class Dialog : public QDialog
{
  Q_OBJECT
 
public:
  Dialog(QWidget *parent = 0);
 
private:
  Ui::Dialog ui;
  QStandardItemModel *model;
 
protected slots:
  void selection(const QModelIndex&);
};

#include "ui_dialog.h"
#include <QStandardItemModel>

class Dialog : public QDialog
{
  Q_OBJECT

public:
  Dialog(QWidget *parent = 0);

private:
  Ui::Dialog ui;
  QStandardItemModel *model;

protected slots:
  void selection(const QModelIndex&);
};

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dialog.cpp

#include <QtCore>
#include <QtGui>
 
#include "ui_dialog.h"
#include "dialog.h"
 
class QAbstractItemModel;
class QAbstractItemView;
class QItemSelectionModel;
class QStandardItemModel;
 
Dialog::Dialog(QWidget *parent) : QDialog(parent)
{
  ui.setupUi(this);
  QStandardItemModel *model = new QStandardItemModel(0, 2, this);
  model->setHeaderData(0, Qt::Horizontal, "Mois");
  model->setHeaderData(1, Qt::Horizontal, "Facture");
 
  QPalette palette;
  QPixmap pixmap = QPixmap("./images/bBackground.png");
  palette.setBrush((this)->backgroundRole(), QBrush(pixmap));
  (this)->setPalette(palette);
 
  ui.treeView->setModel(model);
  QItemSelectionModel *selectionModel = new QItemSelectionModel(model);
  ui.treeView->setSelectionModel(selectionModel);
 
  model->removeRows(0, model->rowCount(QModelIndex()), QModelIndex());
 
  QString month = "October";
  QString amount = "5 Euros";
  int row = model->rowCount(QModelIndex());
  model->insertRows(row, 1, QModelIndex());
  model->setData(model->index(row, 0, QModelIndex()), month );
  model->setData(model->index(row, 1, QModelIndex()), amount );
 
  month = "November";
  amount = "10 Euros";
  row = model->rowCount(QModelIndex());
  model->insertRows(row, 1, QModelIndex());
  model->setData(model->index(row, 0, QModelIndex()), month );
  model->setData(model->index(row, 1, QModelIndex()), amount );
 
  ui.treeView->setEditTriggers(QAbstractItemView::NoEditTriggers);
  ui.treeView->setRootIsDecorated( false );
// works perfect up to here, does not seem to connect then...:o
  connect( ui.treeView, SIGNAL( doubleClicked(const ui.QModelIndex&) ), 
           this, SLOT( selection(const ui.QModelIndex&) ) );
}
 
void Dialog::selection(const QModelIndex& idx)
{
    QString month = "Selection added";
    QString amount = "below:";
    int row;
    row = model->rowCount(QModelIndex());
    model->insertRows(row, 1, QModelIndex());
    model->setData(model->index(row, 0, QModelIndex()), month );
    model->setData(model->index(row, 1, QModelIndex()), amount );
 
  QString col0 = model->data(idx.sibling(idx.row(), 0)).toString();
  QString col1 = model->data(idx.sibling(idx.row(), 1)).toString();
  row = model->rowCount(QModelIndex());
  model->insertRows(row, 1, QModelIndex());
  model->setData(model->index(row, 0, QModelIndex()), col0 );
  model->setData(model->index(row, 1, QModelIndex()), col1 );
}

#include <QtCore>
#include <QtGui>

#include "ui_dialog.h"
#include "dialog.h"

class QAbstractItemModel;
class QAbstractItemView;
class QItemSelectionModel;
class QStandardItemModel;

Dialog::Dialog(QWidget *parent) : QDialog(parent)
{
  ui.setupUi(this);
  QStandardItemModel *model = new QStandardItemModel(0, 2, this);
  model->setHeaderData(0, Qt::Horizontal, "Mois");
  model->setHeaderData(1, Qt::Horizontal, "Facture");

  QPalette palette;
  QPixmap pixmap = QPixmap("./images/bBackground.png");
  palette.setBrush((this)->backgroundRole(), QBrush(pixmap));
  (this)->setPalette(palette);

  ui.treeView->setModel(model);
  QItemSelectionModel *selectionModel = new QItemSelectionModel(model);
  ui.treeView->setSelectionModel(selectionModel);

  model->removeRows(0, model->rowCount(QModelIndex()), QModelIndex());

  QString month = "October";
  QString amount = "5 Euros";
  int row = model->rowCount(QModelIndex());
  model->insertRows(row, 1, QModelIndex());
  model->setData(model->index(row, 0, QModelIndex()), month );
  model->setData(model->index(row, 1, QModelIndex()), amount );

  month = "November";
  amount = "10 Euros";
  row = model->rowCount(QModelIndex());
  model->insertRows(row, 1, QModelIndex());
  model->setData(model->index(row, 0, QModelIndex()), month );
  model->setData(model->index(row, 1, QModelIndex()), amount );

  ui.treeView->setEditTriggers(QAbstractItemView::NoEditTriggers);
  ui.treeView->setRootIsDecorated( false );
// works perfect up to here, does not seem to connect then...:o
  connect( ui.treeView, SIGNAL( doubleClicked(const ui.QModelIndex&) ), 
           this, SLOT( selection(const ui.QModelIndex&) ) );
}

void Dialog::selection(const QModelIndex& idx)
{
    QString month = "Selection added";
    QString amount = "below:";
    int row;
    row = model->rowCount(QModelIndex());
    model->insertRows(row, 1, QModelIndex());
    model->setData(model->index(row, 0, QModelIndex()), month );
    model->setData(model->index(row, 1, QModelIndex()), amount );

  QString col0 = model->data(idx.sibling(idx.row(), 0)).toString();
  QString col1 = model->data(idx.sibling(idx.row(), 1)).toString();
  row = model->rowCount(QModelIndex());
  model->insertRows(row, 1, QModelIndex());
  model->setData(model->index(row, 0, QModelIndex()), col0 );
  model->setData(model->index(row, 1, QModelIndex()), col1 );
}

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ui_dialog.h // generated by Qt

#ifndef UI_DIALOG_H
#define UI_DIALOG_H
 
#include <QtCore/QVariant>
#include <QtGui/QAction>
#include <QtGui/QApplication>
#include <QtGui/QButtonGroup>
#include <QtGui/QDialog>
#include <QtGui/QTreeView>
 
class Ui_Dialog
{
public:
    QTreeView *treeView;
 
    void setupUi(QDialog *Dialog)
    {
    Dialog->setObjectName(QString::fromUtf8("Dialog"));
    Dialog->resize(QSize(400, 230).expandedTo(Dialog->minimumSizeHint()));
    treeView = new QTreeView(Dialog);
    treeView->setObjectName(QString::fromUtf8("treeView"));
    treeView->setGeometry(QRect(89, 60, 201, 80));
    retranslateUi(Dialog);
 
    QMetaObject::connectSlotsByName(Dialog);
    } // setupUi
 
    void retranslateUi(QDialog *Dialog)
    {
    Dialog->setWindowTitle(QApplication::translate("Dialog", "Dialog", 0, QApplication::UnicodeUTF8));
    Q_UNUSED(Dialog);
    } // retranslateUi
 
};
 
namespace Ui {
    class Dialog: public Ui_Dialog {};
} // namespace Ui

#ifndef UI_DIALOG_H
#define UI_DIALOG_H

#include <QtCore/QVariant>
#include <QtGui/QAction>
#include <QtGui/QApplication>
#include <QtGui/QButtonGroup>
#include <QtGui/QDialog>
#include <QtGui/QTreeView>

class Ui_Dialog
{
public:
    QTreeView *treeView;

    void setupUi(QDialog *Dialog)
    {
    Dialog->setObjectName(QString::fromUtf8("Dialog"));
    Dialog->resize(QSize(400, 230).expandedTo(Dialog->minimumSizeHint()));
    treeView = new QTreeView(Dialog);
    treeView->setObjectName(QString::fromUtf8("treeView"));
    treeView->setGeometry(QRect(89, 60, 201, 80));
    retranslateUi(Dialog);

    QMetaObject::connectSlotsByName(Dialog);
    } // setupUi

    void retranslateUi(QDialog *Dialog)
    {
    Dialog->setWindowTitle(QApplication::translate("Dialog", "Dialog", 0, QApplication::UnicodeUTF8));
    Q_UNUSED(Dialog);
    } // retranslateUi

};

namespace Ui {
    class Dialog: public Ui_Dialog {};
} // namespace Ui

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[wysota]

Did you have a look at the console? I'm sure it'll tell you "there is no such signal".

connect( ui.treeView, SIGNAL( doubleClicked(const ui.QModelIndex&) ), 
           this, SLOT( selection(const ui.QModelIndex&) ) );

connect( ui.treeView, SIGNAL( doubleClicked(const ui.QModelIndex&) ), 
           this, SLOT( selection(const ui.QModelIndex&) ) );

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Change it to:

connect( ui.treeView, SIGNAL( doubleClicked(const QModelIndex&) ), 
           this, SLOT( selection(const QModelIndex&) ) );

connect( ui.treeView, SIGNAL( doubleClicked(const QModelIndex&) ), 
           this, SLOT( selection(const QModelIndex&) ) );

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See the difference?

[incapacitant]

There is a difference but it is not very good. When I double click on one row, the program crashes. Proof I guess that the slot is activated, and that the problem is in the slot code.
If I remove all but the 3 variables declarations then it does not crash, but it won't increment the content of the model or the view.

[incapacitant]

in the end i fixed it after you gave your clue. thx very much