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
Qt Code: 
  1. #include <QtCore>
  2. #include <QtGui>
  3.  
  4. #include "dialog.h"
  5.  
  6. int main(int argc, char *argv[])
  7. {
  8.   QApplication app(argc, argv);
  9.   Dialog *window = new Dialog;
  10.   window->show();
  11.   return app.exec();
  12. }
To copy to clipboard, switch view to plain text mode 

dialog.h
Qt Code: 
  1. #include "ui_dialog.h"
  2. #include <QStandardItemModel>
  3.  
  4. class Dialog : public QDialog
  5. {
  6.   Q_OBJECT
  7.  
  8. public:
  9.   Dialog(QWidget *parent = 0);
  10.  
  11. private:
  12.   Ui::Dialog ui;
  14.  
  15. protected slots:
  16.   void selection(const QModelIndex&);
  17. };
To copy to clipboard, switch view to plain text mode 

dialog.cpp
Qt Code: 
  1. #include <QtCore>
  2. #include <QtGui>
  3.  
  4. #include "ui_dialog.h"
  5. #include "dialog.h"
  6.  
  11.  
  12. Dialog::Dialog(QWidget *parent) : QDialog(parent)
  13. {
  14.   ui.setupUi(this);
  15.   QStandardItemModel *model = new QStandardItemModel(0, 2, this);
  16.   model->setHeaderData(0, Qt::Horizontal, "Mois");
  17.   model->setHeaderData(1, Qt::Horizontal, "Facture");
  18.  
  19.   QPalette palette;
  20.   QPixmap pixmap = QPixmap("./images/bBackground.png");
  21.   palette.setBrush((this)->backgroundRole(), QBrush(pixmap));
  22.   (this)->setPalette(palette);
  23.  
  24.   ui.treeView->setModel(model);
  25.   QItemSelectionModel *selectionModel = new QItemSelectionModel(model);
  26.   ui.treeView->setSelectionModel(selectionModel);
  27.  
  28.   model->removeRows(0, model->rowCount(QModelIndex()), QModelIndex());
  29.  
  30.   QString month = "October";
  31.   QString amount = "5 Euros";
  32.   int row = model->rowCount(QModelIndex());
  33.   model->insertRows(row, 1, QModelIndex());
  34.   model->setData(model->index(row, 0, QModelIndex()), month );
  35.   model->setData(model->index(row, 1, QModelIndex()), amount );
  36.  
  37.   month = "November";
  38.   amount = "10 Euros";
  39.   row = model->rowCount(QModelIndex());
  40.   model->insertRows(row, 1, QModelIndex());
  41.   model->setData(model->index(row, 0, QModelIndex()), month );
  42.   model->setData(model->index(row, 1, QModelIndex()), amount );
  43.  
  44.   ui.treeView->setEditTriggers(QAbstractItemView::NoEditTriggers);
  45.   ui.treeView->setRootIsDecorated( false );
  46. // works perfect up to here, does not seem to connect then...:o
  47.   connect( ui.treeView, SIGNAL( doubleClicked(const ui.QModelIndex&) ), 
  48.            this, SLOT( selection(const ui.QModelIndex&) ) );
  49. }
  50.  
  51. void Dialog::selection(const QModelIndex& idx)
  52. {
  53.     QString month = "Selection added";
  54.     QString amount = "below:";
  55.     int row;
  56.     row = model->rowCount(QModelIndex());
  57.     model->insertRows(row, 1, QModelIndex());
  58.     model->setData(model->index(row, 0, QModelIndex()), month );
  59.     model->setData(model->index(row, 1, QModelIndex()), amount );
  60.  
  61.   QString col0 = model->data(idx.sibling(idx.row(), 0)).toString();
  62.   QString col1 = model->data(idx.sibling(idx.row(), 1)).toString();
  63.   row = model->rowCount(QModelIndex());
  64.   model->insertRows(row, 1, QModelIndex());
  65.   model->setData(model->index(row, 0, QModelIndex()), col0 );
  66.   model->setData(model->index(row, 1, QModelIndex()), col1 );
  67. }
To copy to clipboard, switch view to plain text mode 

ui_dialog.h // generated by Qt
Qt Code: 
  1. #ifndef UI_DIALOG_H
  2. #define UI_DIALOG_H
  3.  
  4. #include <QtCore/QVariant>
  5. #include <QtGui/QAction>
  6. #include <QtGui/QApplication>
  7. #include <QtGui/QButtonGroup>
  8. #include <QtGui/QDialog>
  9. #include <QtGui/QTreeView>
  10.  
  11. class Ui_Dialog
  12. {
  13. public:
  14.     QTreeView *treeView;
  15.  
  16.     void setupUi(QDialog *Dialog)
  17.     {
  18.     Dialog->setObjectName(QString::fromUtf8("Dialog"));
  19.     Dialog->resize(QSize(400, 230).expandedTo(Dialog->minimumSizeHint()));
  20.     treeView = new QTreeView(Dialog);
  21.     treeView->setObjectName(QString::fromUtf8("treeView"));
  22.     treeView->setGeometry(QRect(89, 60, 201, 80));
  23.     retranslateUi(Dialog);
  24.  
  25.     QMetaObject::connectSlotsByName(Dialog);
  26.     } // setupUi
  27.  
  28.     void retranslateUi(QDialog *Dialog)
  29.     {
  30.     Dialog->setWindowTitle(QApplication::translate("Dialog", "Dialog", 0, QApplication::UnicodeUTF8));
  31.     Q_UNUSED(Dialog);
  32.     } // retranslateUi
  33.  
  34. };
  35.  
  36. namespace Ui {
  37.     class Dialog: public Ui_Dialog {};
  38. } // namespace Ui
To copy to clipboard, switch view to plain text mode