Problem with showMaximized()

[Lykurg]

Hi,

in my QMainWindow-class I call showMaximized(), which works if I comment out following line:

img->setPixmap ( QPixmap(":/sokrates_600") );

img->setPixmap ( QPixmap(":/sokrates_600") );

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img is a Label in an QWidget-based class, which builds a page in a QStackedWidget, which is set to central widget in the mainclass. When the image from the resource is set, the windows reduced to the preferred size of the image-holding-widget.

What's wrong with setPixmap, that it destroys my showMaximized()?


Thanks,
Lykurg

Note: If the application appears it seems that it starts in full screen, but then immediately shirks.

[jpn]

Have you changed default size policies?

[Lykurg]

Have you changed default size policies?

No, nothing. I use the Designer and just drag and drop a label to the widget.
I figured out, that if I don't apply a layout to the widget, the window is shown maximized. If I chose any layout, the window is shrinking.

Lykurg

Edit: Also if I code by hand same result:

window_startscreen::window_startscreen ( QWidget *parent )
    : QWidget ( parent )
{
  QLabel * img = new QLabel;
  img->setPixmap ( QPixmap ( ":/sokrates_600" ) );
 
  QHBoxLayout *layout = new QHBoxLayout;
  layout->addWidget ( img );
  setLayout ( layout );
}

window_startscreen::window_startscreen ( QWidget *parent )
    : QWidget ( parent )
{
  QLabel * img = new QLabel;
  img->setPixmap ( QPixmap ( ":/sokrates_600" ) );
  
  QHBoxLayout *layout = new QHBoxLayout;
  layout->addWidget ( img );
  setLayout ( layout );
}

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[jpn]

Which exact version of Qt on which platform? I can't reproduce the problem. I tried with following minimalistic code but the window is shown maximized. Does this not work for you?

#include <QtGui>
 
int main(int argc, char* argv[])
{
	QApplication app(argc, argv);
	QWidget window;
 
	QLabel* label = new QLabel;
	label->setPixmap(QPixmap("test.png"));
 
	QHBoxLayout* layout = new QHBoxLayout;
	layout->addWidget(label);
	window.setLayout(layout);
 
	window.showMaximized();
	return app.exec();
}

#include <QtGui>

int main(int argc, char* argv[])
{
	QApplication app(argc, argv);
	QWidget window;

	QLabel* label = new QLabel;
	label->setPixmap(QPixmap("test.png"));

	QHBoxLayout* layout = new QHBoxLayout;
	layout->addWidget(label);
	window.setLayout(layout);

	window.showMaximized();
	return app.exec();
}

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[Lykurg]

Well, your example works. I have attached a half-minimalistic example, which works but also don't:

• Run make and start lykurg -> the window is small
• edit mainwindow.ui in designer and remove the whole "datei"-menu
• rebuild the project and start -> window is shown maximized???

I use Qt 4.3.0. What's the Problem with the menubar?


Thanks, Lykurg

[Lykurg]

... and I use the linux-version.

[jpn]

Just to mention, I was able to reproduce the problem on X11. However, I'm not exactly sure which part of generated code causes the faulty behavior.