CODEWITHSUNDEEP
c++qtshowqwidgetqdialog
Roukira
Roukira

Reputation: 229

Qt - Non Modal Dialog before Main Window is created

I've been struggling to do this : I want to show on a window a QWidget, or a QDialog before the MainWindow is created, but I cannot use exec() because it will enter its loop and won't create my MainWindow before I accept or reject the dialog.

The reason I want to do this is to have a widget showing information while the MainWindow constructs itself. I don't want to keep this extra window once the MainWindow is showing up.

I believe the issue comes from the fact that the main window is already created when a.exec() is called and the window won't show up before a.exec(). The solution I found is to use a QDialog instead and call exec() but it blocks the rest of the code which I don't want to happen.

Code : 

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
StartUpDialog start; //this is my custom QDialog, can be a QWidget if necessary.
qDebug() << "starting up!";
MainWindow w;
start.exec(); //I tried show() but it won't show up.
w.startApp(&start); //this function will do some stuff.
w.show();
//I don't want start to stay after mainwindow shows up
return a.exec();
}

Here is what I tried so far :

Hopefully you can help me in that issue, and thanks for reading !

UPDATE : Solved thanks to Trap, here is how I made it :

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
StartUpDialog start;
QSplashScreen *splash = new QSplashScreen();
StartUpWidget *start = new StartUpWidget(splash);
splash->resize(350,380);
start->show();
splash->raise();
splash->show();
qDebug() << "starting up!";
MainWindow w;
w.startApp(start);
w.show();
splash->finish(&w);
start->deleteLater();
splash->deleteLater();
return a.exec();
 }

My only concern is that I use a Gif inside my widget using QMovie and updating it has to be done manually apparently.

Upvotes: 4

Views: 1512

Answers (1)

Trap
Trap

Reputation: 228

If I understand your problem correctly (showing a dialog until your main window is created), you should have a look at the QSplashScreen class : http://doc.qt.io/qt-5/qsplashscreen.html

Upvotes: 3

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