Showing a splash screen with transparency.

[kremuwa]

Hello,

In my app, I've got such a piece of code:

QSplashScreen splashScreen(QPixmap(":/data/other/splashScreen.png"));
splashScreen.show();
splashScreen.showMessage(QString("Loading..."),Qt::AlignCenter | Qt::AlignBottom,QColor(0,150,255));

MainWindow w;
splashScreen.finish(&w);
w.show();

It shows me a splash screen, but in places that should be transparent (as the base for this splash screen is a PNG image) there is background. Is this possible to have a splash screen with transparency?

[borisbn]

Did you try to set opacity (http://doc.qt.nokia.com/4.6/qwidget.html#windowOpacity-prop) property to your splash window?

[kremuwa]

But I want only the transparent placec from PNG to be transparent and this doesn't seem to help me with that.

[aamer4yu]

Try to play with Qt::WA_TranslucentBackground

[tsp]

I have next piece of code in my project and it produces transparent background for png-image I use.



QPixmap pixmap(":/images/splash.png");
QSplashScreen splash(pixmap);
splash.setMask(pixmap.mask());
splash.show();

[kremuwa]

Thank you very much for your responses. Unfortunately, Qt::WA_TranslucentBackground (together with Qt::FramelessWindowHint flag passed to the splash screen constructor) didn't work - it made the splash screen completely transparent - not only its "transparent places" from PNG. Tsp, your solution works well :).

[raedbenz]

hello i tried this but no joy.


#include <QtGui/QApplication>

#include<QTimer>
#include <QSplashScreen>
#include <QMainWindow>

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

QApplication a(argc, argv);

QPixmap pixmap(":/splash.png");
QSplashScreen splash(pixmap);
//splash.setMask(pixmap.mask());

splash.showMessage(QString("Loading..."),Qt::AlignCenter | Qt::AlignBottom,QColor(0,150,255));
splash.show();


QMainWindow mainWin;

QTimer::singleShot(1500, &splash, SLOT(close()));

QTimer::singleShot(1500, &mainWin, SLOT(show()));

return a.exec();

}

only the main window is displayed after timeout. the image splash.png is in my working directory.
if i uncomment splash.setMask(pixmap.mask()); i get: invalid use of incomplete type 'struct QBitmap' forward declaration of 'struct QBitmap'.

any hints? thanks

[saa7_go]

if i uncomment splash.setMask(pixmap.mask()); i get: invalid use of incomplete type 'struct QBitmap' forward declaration of 'struct QBitmap'.


You must include QBitmap header.



#include <QBitmap>

[raedbenz]

You must include QBitmap header.



#include <QBitmap>

thanks. but still no splash screen is displayed.

[tsp]

image splash.png is in my working directory
Maybe the problem is in the way you are are referring to splash screen file i.e.


QPixmap pixmap(":/splash.png");
You are using :/ prefix, so the file should be defined in the resource (http://doc.qt.nokia.com/latest/resources.html) file, maybe you have not done that?

[raedbenz]

Maybe the problem is in the way you are are referring to splash screen file i.e.


QPixmap pixmap(":/splash.png");
You are using :/ prefix, so the file should be defined in the resource (http://doc.qt.nokia.com/latest/resources.html) file, maybe you have not done that?

Hello,
i have added this, res.qrc

<!DOCTYPE RCC><RCC version="1.0">
<qresource>
<file>twirl.png</file>
<file>splash.png</file>
</qresource>
</RCC>
and when i compile i get :: error: [debug/qrc_res.cpp] Error 1

my project file is:


SOURCES += \
main2.cpp

RESOURCES += \
res.qrc

thanks

[Bong.Da.City]

I have next piece of code in my project and it produces transparent background for png-image I use.



QPixmap pixmap(":/images/splash.png");
QSplashScreen splash(pixmap);
splash.setMask(pixmap.mask());
splash.show();


Thanks.. It works :)