QSpinBox non appare

Imhotep

Salve a tutti. Ho iniziato a usare da poco Qt e avrei un problema: Dopo aver creato la finestra principale e una QTable, ho creato una QGroupBox e vorrei che all'interno di quest'ultima coi fosse una QSpinBox. Questo è il mio tentativo, ma appare tutto tranne la QSpinBox:

@
//mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QTableWidget>
#include <QGroupBox>
#include <QSpinBox>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
Q_OBJECT

public:
explicit MainWindow(QWidget *parent = 0);

~MainWindow();

public slots:
void cellSelected(int nRow, int nCol);

private:
Ui::MainWindow *ui;

QTableWidget* m_pTableWidget;
QStringList m_TableHeader;

QGroupBox* gb1;
QSpinBox* numericupdown;

};

#endif // MAINWINDOW_H

//mainwindow.cpp

#include "mainwindow.h"

#include <QApplication>
#include <QDesktopWidget>
#include <QtCore/QCoreApplication>
#include <QHeaderView>
#include <QMessageBox>

MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent),
m_pTableWidget(NULL)
{
resize(950, 600);
m_pTableWidget = new QTableWidget(this);
m_pTableWidget->setRowCount(4);
m_pTableWidget->setColumnCount(3);
m_TableHeader<<"A"<<"B"<<"C";
m_pTableWidget->setHorizontalHeaderLabels(m_TableHeader);
m_pTableWidget->resizeColumnsToContents();
m_pTableWidget->verticalHeader()->setVisible(false);
m_pTableWidget->setEditTriggers(QAbstractItemView::NoEditTriggers);
m_pTableWidget->setSelectionBehavior(QAbstractItemView::SelectItems);
m_pTableWidget->setSelectionMode(QAbstractItemView::SingleSelection);
m_pTableWidget->setShowGrid(true);
m_pTableWidget->setStyleSheet("QTableView {selection-background-color: grey;}");
m_pTableWidget->horizontalHeader()->setDefaultSectionSize(115);
m_pTableWidget->verticalHeader()->setDefaultSectionSize(20);
m_pTableWidget->horizontalHeader()->setHighlightSections(false);
//m_pTableWidget->setGeometry(QApplication::desktop()->screenGeometry());
m_pTableWidget->move(30, 25);
m_pTableWidget->resize(350, 151);

//insert data
m_pTableWidget->setItem(0, 0, new QTableWidgetItem("Hello"));

connect( m_pTableWidget, SIGNAL( cellDoubleClicked (int, int) ),
         this, SLOT( cellSelected( int, int ) ) );

gb1 = new QGroupBox(this);
gb1->move(30, 180);
gb1->resize(160, 75);
numericupdown = new QSpinBox(this);
numericupdown->move(106, 17);
numericupdown->resize(50, -1);
numericupdown->setRange(-20, 20);
numericupdown->setSingleStep(1);
numericupdown->setValue(0);

}

MainWindow::~MainWindow()
{
}

void MainWindow::cellSelected(int nRow, int nCol)
{
QMessageBox::information(this, "",
"Cell at row "+QString::number(nRow)+
" column "+QString::number(nCol)+
" was double clicked.");
}
@

mrdebug

Ti consiglio di usare l'ide per disegnare le interfacce grafiche altrimenti rischi di pedere un sacco dui tempo.