Hi, I'm making qt gui application, and in mainwindow I have QWidget, which should become one of my custom widgets..

here's a code

Qt Code: 
  1. MainWindow::MainWindow(QWidget *parent) :
  2.     QMainWindow(parent)
  3. {
  4.     QWidget *tempWidget = new QWidget(this);
  5.     setMinimumSize(800,600);
  6.     QFormLayout *mainLayout=new QFormLayout();
  7.     QVBoxLayout *btnsLayout=new QVBoxLayout;
  8.     btns=new QGroupBox;
  9.     widget=new QWidget;
  10.     widget->setStyleSheet("height: 400px; width: 500px;");
  11.     onlineGameButton=new QPushButton("ONLINE GAME");
  12.     connect(onlineGameButton, SIGNAL(clicked()), this, SLOT(newOnlineGame()));
  13.     offlineGameButton=new QPushButton("OFFLINE GAME");
  14.     simulateGameButton=new QPushButton("SIMULATE GAME");
  15.     optionsButton=new QPushButton("OPTIONS");
  16.     exitButton=new QPushButton("EXIT");
  17.     connect(exitButton, SIGNAL(clicked()), this, SLOT(exitProgram()));
  18.     btnsLayout->addWidget(onlineGameButton);
  19.     btnsLayout->addWidget(offlineGameButton);
  20.     btnsLayout->addWidget(simulateGameButton);
  21.     btnsLayout->addWidget(optionsButton);
  22.     btnsLayout->addWidget(exitButton);
  23.     btnsLayout->addStretch();
  24.     btns->setLayout(btnsLayout);
  25.     mainLayout->addRow(btns, widget);
  26. ...
  27.     tempWidget->setLayout(mainLayout);
  28.     setCentralWidget(tempWidget);
  29. }
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Qt Code: 
  1. void MainWindow::newOnlineGame()
  2. {
  3.     widget=new GameWidgetView;
  4. }
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i used debug to view if event is fired, and it is, but nothing happend, widget didn't become GameWidgetView...

widget is defined as private member of MainWindow, so when I add it to centralwidget, when i change widget, it should be changed and "that widget" in centralwidget, too, right(because of reference)?

sorry for my english