World Time Clock Builder Example

Loading and Building the Form

Since this example only loads and displays a pre-prepared form, all of the work can be done in the main() function. We are using a class from the QtUiTools library so, in addition to any other Qt classes that are normally required to write an application, we must include the appropriate header file:

 #include <QtUiTools>

The main function initializes the resource system with the Q_INIT_RESOURCE() macro and constructs an QApplication instance in the usual way:

 int main(int argc, char *argv[])
 {
     Q_INIT_RESOURCE(worldtimeclockbuilder);

     QApplication app(argc, argv);

     QUiLoader loader;

We construct a QUiLoader object to handle the form we want to use.

The form itself is obtained from the resource file system using the path defined in the resource file. We use the form loader to load and construct the form:

     QFile file(":/forms/form.ui");
     file.open(QFile::ReadOnly);

     QWidget *widget = loader.load(&file);

     file.close();
     widget->show();

Once the form has been loaded, the resource file can be closed and the widget is shown.

     return app.exec();
 }

The form loader ensures that all the signal and slot connections between objects in the form are set up correctly when the form is loaded. As a result, the time is updated by the World Time Clock widget, and the time zone spin box can be used to change the position of the hour hand.