QSplashScreen in a derived class from QApplication

[franco.amato]

Good evening,
I have an application where I derive from QApplication ( OBox is my class derived from QApplication ) and I have some problems with a QSplashScreen.

Here I post some code:

The main.cpp

#include "OBox.h"
 
int main(int argc, char* argv[])
{
    OBox application(argc, argv);
    return application.exec();
}

#include "OBox.h"

int main(int argc, char* argv[])
{
    OBox application(argc, argv);
    return application.exec();
}

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and here the ctor of OBox where I would show the QSplashScreen:

#include "OBox.h"
 
#include <Windows.h>
#include <Dbt.h>
 
#include <QDesktopServices>
#include <QDateTime>
#include <QInputDialog>
#include <QProgressDialog>
#include <QMessageBox>
#include <QDebug>
#include <QSplashScreen>
#include <QPixmap>
 
#include "ReleaseVariables.h"
#include "Utilities.h"
 
OBox::OBox(int& argc, char** argv) : QApplication(argc, argv)
{
    // Initialize application info
 
    setApplicationName(APPLICATION_TITLE);
    setApplicationVersion(APPLICATION_VERSION);
 
    QSplashScreen *splash = new QSplashScreen;// <---- create a QSplashScreen
    splash->setPixmap(QPixmap(":/Resources/Splash.png"));// <----- set the image I would show
    splash->show();// <---- after show it  close immediately
    qApp->processEvents();
 
    // Initialize paths
 
    m_applicationDir.setPath(QCoreApplication::applicationDirPath());
 
    QString dataPath = QDesktopServices::storageLocation(QDesktopServices::DocumentsLocation);
    QDir dataDir(dataPath);
 
    m_userDataDir.setPath(dataDir.filePath("OBoxUserData"));
    m_userDataDir.mkpath("."); // Make sure path exists (no problem if it's already there)
 
#ifndef DEVELOPMENT_MODE
 
    QStringList libraryPaths;
 
    if (m_applicationDir.exists("Plugins/Qt"))
    {
        libraryPaths.append(m_applicationDir.filePath("Plugins/Qt"));
    }
 
    setLibraryPaths(libraryPaths);
 
#endif
 
    setQuitOnLastWindowClosed(true);
 
    // Initialize objects
 
    m_drivesUpdateTimer = new QTimer(this);
    m_drivesUpdateTimer->setSingleShot(true);
 
    connect(m_drivesUpdateTimer, SIGNAL(timeout()), SLOT(updateDrives()));
 
    m_mainWindow = new MainWindow(this);
    m_mainWindow->showMaximized();
    QTimer::singleShot(15000, splash, SLOT(close()));// <------should close splash after 5s but doesn't have any effect
 
    connect(this, SIGNAL(sourceDirPathsChanged(QStringList)),
            m_mainWindow, SLOT(setSourceDirPaths(QStringList)));
 
    splash->finish(m_mainWindow);
    delete splash;
}

#include "OBox.h"

#include <Windows.h>
#include <Dbt.h>

#include <QDesktopServices>
#include <QDateTime>
#include <QInputDialog>
#include <QProgressDialog>
#include <QMessageBox>
#include <QDebug>
#include <QSplashScreen>
#include <QPixmap>

#include "ReleaseVariables.h"
#include "Utilities.h"

OBox::OBox(int& argc, char** argv) : QApplication(argc, argv)
{
    // Initialize application info

    setApplicationName(APPLICATION_TITLE);
    setApplicationVersion(APPLICATION_VERSION);

    QSplashScreen *splash = new QSplashScreen;// <---- create a QSplashScreen
    splash->setPixmap(QPixmap(":/Resources/Splash.png"));// <----- set the image I would show
    splash->show();// <---- after show it  close immediately
    qApp->processEvents();

    // Initialize paths

    m_applicationDir.setPath(QCoreApplication::applicationDirPath());

    QString dataPath = QDesktopServices::storageLocation(QDesktopServices::DocumentsLocation);
    QDir dataDir(dataPath);

    m_userDataDir.setPath(dataDir.filePath("OBoxUserData"));
    m_userDataDir.mkpath("."); // Make sure path exists (no problem if it's already there)

#ifndef DEVELOPMENT_MODE

    QStringList libraryPaths;

    if (m_applicationDir.exists("Plugins/Qt"))
    {
        libraryPaths.append(m_applicationDir.filePath("Plugins/Qt"));
    }

    setLibraryPaths(libraryPaths);

#endif

    setQuitOnLastWindowClosed(true);

    // Initialize objects

    m_drivesUpdateTimer = new QTimer(this);
    m_drivesUpdateTimer->setSingleShot(true);

    connect(m_drivesUpdateTimer, SIGNAL(timeout()), SLOT(updateDrives()));

    m_mainWindow = new MainWindow(this);
    m_mainWindow->showMaximized();
    QTimer::singleShot(15000, splash, SLOT(close()));// <------should close splash after 5s but doesn't have any effect

    connect(this, SIGNAL(sourceDirPathsChanged(QStringList)),
            m_mainWindow, SLOT(setSourceDirPaths(QStringList)));

    splash->finish(m_mainWindow);
    delete splash;
}

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The problem is that the splashscreen close immediately without wait the close() slot that should be called by the timer ( 5s after the splashscreen creation).

Where is the mystake(s) ?

I hope to get help.

Deleting the

delete splash;

delete splash;

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nothing changes.
Seems the timer has no effect. I know that the event loop shold start to have a timer working.
Regards
Franco

[wysota]

You're calling finish() on the splash which closes the widget.

[franco.amato]

Thank you.
The problem was on z order. The splashscreen wasn't on top.
Adding a QWidget::raise () solved the problem.

Regards,
Franco