How to create a splash screen with an induced delay: Difference between revisions

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[[Category:HowTo]]
We have {{DocLink|QSplashScreen}} which is used to cover up the starting delay of the program. Some times the programs might be quick enough, so that the splash screen may not be visible. We may induce some delay to show the splash, as a decoration!


h1. How to create a splash screen with an induced delay.
Single shot timer {{DocLink|QTimer}} will do.
 
We have [http://doc.qt.nokia.com/latest/qsplashscreen.html QSplashScreen] which is used to cover up the starting delay of the program. More about splash screen is [http://doc.qt.nokia.com/latest/qsplashscreen.html here].
Some times the programs might be quick enough ,so that the splash screen may not be visible. We may induce some delay to show the splash , as a decoration !
 
Here in this example, using [http://doc.qt.nokia.com/latest/qthread.html QThread] a delay is induced.


<code>
<code>
#include <QApplication>
#include <QApplication>
#include <QSplashScreen>
#include <QSplashScreen>
#include <qthread.h>
#include <QTimer>
#include "mainwindow.h"
#include "mainwindow.h"
class I : public QThread
{
public:
static void sleep(unsigned long secs) {
QThread::sleep(secs);
}
};


int main(int argc, char *argv[])
int main(int argc, char *argv[])
{
{
 
    QApplication app(argc, argv);
QApplication app(argc, argv);
    QPixmap pixmap("splash.jpg");
QPixmap pixmap("splash.jpg");
    QSplashScreen splash(pixmap, Qt::WindowStaysOnTopHint);
QSplashScreen splash(pixmap);
    splash.show();
splash.show();
    QTimer::singleShot(5000, &splash, &QWidget::close); // keep displayed for 5 seconds
MainWindow mainWin;
    MainWindow mainWin;
mainWin.setWindowTitle("Application");
    mainWin.showMaximized();
I::sleep(5); // splash is shown for 5 seconds
    return app.exec();
mainWin.showMaximized();
splash.finish(&amp;mainWin);
return app.exec();
}
}
</code>
</code>
Easy! Happy coding!
[[Category:HowTo]]

Latest revision as of 06:54, 21 June 2019

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We have QSplashScreen which is used to cover up the starting delay of the program. Some times the programs might be quick enough, so that the splash screen may not be visible. We may induce some delay to show the splash, as a decoration!

Single shot timer QTimer will do. 

#include <QApplication>
#include <QSplashScreen>
#include <QTimer>
#include "mainwindow.h"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QPixmap pixmap("splash.jpg");
    QSplashScreen splash(pixmap, Qt::WindowStaysOnTopHint);
    splash.show();
    QTimer::singleShot(5000, &splash, &QWidget::close); // keep displayed for 5 seconds
    MainWindow mainWin;
    mainWin.showMaximized();
    return app.exec();
}
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