Need help... confused a bit with Qt Creator

[Power_user_EX]

Hi all .. I m new to Qt 4.7 programming using Qt Creator .. Have some questions :

1. Whats the basic difference between Qt Quick Application / UI and Qt Widget based app (Qt Gui application) in terms of programming style and convensions ? The main difference I see it Quick App uses QML for GUI design while Qt Widget based app uses UI forms to design GUI using Drag and drop .. after this is a bit confusing for me.

2. Can some 1 explain me this code :
   @class MainWindow : public QMainWindow
   {
   Q_OBJECT

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

private:
Ui::MainWindow *ui;
};@

especially Q_OBJECT and @explicit MainWindow (QWidget *parent = 0);@

3. And this code :
   @
   MainWindow::MainWindow(QWidget *parent) :
   QMainWindow(parent),
   ui(new Ui::MainWindow)
   {
   ui->setupUi(this);
   }

MainWindow::~MainWindow()
{
delete ui;
}
@

4. If I want to program the same using Qt Quick what will the difference in code style ?

-Regards ,
Umang G (Power_user_EX)

[koahnig]

Qt creator is an IDE (Integrated Development Environment) which helps you developing your applications.

The sections, you are showing, are C++ source code presumably generated by the Qt creator based it templates.

Q_OBJECT is required for the "Meta Object Compiler ":http://developer.qt.nokia.com/doc/qt-4.8/moc.html

The "explicit statement is explained here":http://www.glenmccl.com/tip_023.htm for example.

All see there is basic C++ code. It is recommended to have sufficient knowledge of C++ for using it with Qt. You might want to look for a C++ tutorial first, if you are lacking this knowledge. "One option for a tutorial.":http://www.cplusplus.com/doc/tutorial/ Please consult google search for others.