Splash Screens

Splash Screens

如何为QT创建一个闪屏

Many applications present a splash screen at startup, such as the one shown in Figure 3.18. Some developers use a splash screen to disguise a slow startup, while others do it to satisfy their marketing departments. Adding a splash screen to Qt applications is very easy using the QSplashScreen class.

The QSplashScreen class shows an image before the main window appears. It can also write messages on the image to inform the user about the progress of the application's initialization process. Typically, the splash screen code is located in main(), before the call to QApplication::exec().

Next is an example main() function that uses QSplashScreen to present a splash screen in an application that loads modules and establishes network connections at startup.

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QSplashScreen *splash = new QSplashScreen;
    splash->setPixmap(QPixmap(":/images/splash.png"));
    splash->show();

    Qt::Alignment topRight = Qt::AlignRight | Qt::AlignTop;
    splash->showMessage(QObject::tr("Setting up the main window..."),
                           topRight, Qt::white);
    MainWindow mainWin;

    splash->showMessage(QObject::tr("Loading modules..."),
                           topRight, Qt::white);
    loadModules();

    splash->showMessage(QObject::tr("Establishing connections..."),
                           topRight, Qt::white);
    establishConnections();

    mainWin.show();
    splash->finish(&mainWin);
    delete splash;

    return app.exec();
}

We have now completed the Spreadsheet application's user interface. In the next chapter, we will complete the application by implementing the core spreadsheet functionality.

THE END!

2012年12月30日