How to set background of application??

[kamlesh.sangani]

Hi,

I am new bie to Qt. I want to set background (image) to my application. how can i do that??
I know QPixmap load the image but i dont know how to set it as background.

I am working on Qt for S60(Symbian OS). Using 4.5.0-garden release.

Thanks,
kamlesh.

[wysota]

Take a look at QPalette.

[wagmare]

hi friends ,
i am little confused with this question
which one is best to set the background ..
QPalette or StyleSheet...?

[spirit]

using QPalette is faster, but you still can use Style Sheets. :)

[wagmare]

thanks for the reply first ...
in a graphicsView i am animating an item .. when mouse hover over the item it will scale ... normally it works perfectly untill i setStyleSheet->background color .. the animation becomes very slow .. so i switch to QPalette and now it works fine ... why ...?

[spirit]

as I said, QPalette is faster then Style Sheets, because when you use Style Sheets all information about style must be parsed and this process takes a time.

[wagmare]

thanks .. i get it ...

[kamlesh.sangani]

Take a look at QPalette.

AFAIK QPalette will help to change colors of background, not to set image as background. I want to set image as background.

[spirit]

then you need to reimplement QWidget:: paintEvent and using QPainter::drawPixmap draw it.

[wagmare]

AFAIK QPalette will help to change colors of background, not to set image as background. I want to set image as background.

use styleSheet background-image:

[wysota]

AFAIK QPalette will help to change colors of background, not to set image as background. I want to set image as background.

Funny, I wonder what QPalette::setBrush() is for then :)


#include <QtGui>

int main(int argc, char **argv){
QApplication app(argc, argv);
QListView w;
QPalette p = w.palette();
p.setBrush(QPalette::Base, QPixmap("/usr/share/wallpapers/Air/contents/images/1024x768.jpg"));
w.setPalette(p);
w.show();
return app.exec();
}

[kamlesh.sangani]

Fantastic. its worked for me. thanks a lot wysota.

I ve dont it with slit modification.



p.setBrush(QPalette::Background, QPixmap("C://01.jpg"))

[wysota]

The role depends on the widget so with a listview you have to use Base while for a frame you'd use Window or Background.

[IRON_MAN]

But with palette if you have labels,buttons... you cover with the background image,isn't it?
How can it solve it?

[wysota]

You cover what with what?

[IRON_MAN]

I have set some buttons in a window and now I have to insert an image as a background.
I´m trying to do as you say but now the buttons don't appear.

[wysota]

Please show us the code.

[IRON_MAN]

It was a problem of my programm. I have solved it!

But, if I maximize the window , the image appears once,twice... and it doesn´t suit to the window. My image is .bmp

QPalette pal = widget.palette();
pal.setBrush( QPalette::Window, QPixmap("image.bmp"));
widget.setPalette( pal );

[nish]

It was a problem of my programm. I have solved it!

But, if I maximize the window , the image appears once,twice... and it doesn´t suit to the window. My image is .bmp

QPalette pal = widget.palette();
pal.setBrush( QPalette::Window, QPixmap("image.bmp"));
widget.setPalette( pal );

re implement resizeEvent and resize your image to desired size


void MyWidget::resizeEvent(QResizeEvent* e)
{
static QPixmap pix("image.bmp");
QPalette pal = widget.palette();
pal.setBrush( QPalette::Window, pix.scaled(e->size(),...,...) );
widget.setPalette( pal );
}

[IRON_MAN]

Thanks a lot!

[tsuibin]

in qt ,how can i enlarge and narrow a image (QPixmap)?

[nish]

take at look at QPixmap::scaled()