set QMainWindow in the center of my desktop

[raphaelf]

Hi everybody,

QT: 4.1.3
OS: WinXP PRO
Compiler: MINGW

I am trying to set my app in the midle of my desktop. How can i do tha?Should i use setCentralWidget??




#include <QApplication>
#include "mainwindow.h"


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


QApplication app(argc, argv);
app.setStyle("plastique");
app.setPalette( app.style()->standardPalette() );
MainWindow m;
m.setMinimumSize(451,600);
m.setMaximumSize(451,600);
// m.setCentralWidget();

m.show();
return app.exec();
}

[jpn]

QDesktopWidget provides access to screen geometries.

[sector]

This gives you what you want (copy to constructor of your "MainWindow"):



QDesktopWidget *desktop = QApplication::desktop();

int screenWidth, width;
int screenHeight, height;
int x, y;
QSize windowSize;

screenWidth = desktop->width(); // get width of screen
screenHeight = desktop->height(); // get height of screen

windowSize = size(); // size of our application window
width = windowSize.width();
height = windowSize.height();

// little computations
x = (screenWidth - width) / 2;
y = (screenHeight - height) / 2;
y -= 50;

// move window to desired coordinates
move ( x, y );

[jpn]

QRect r = widget->geometry();
r.moveCenter(QApplication::desktop()->availableGeometry().center());
widget->setGeometry(r);


Be aware that constructor of a widget may not always be a reliable place to ask widget for it's geometries...

[ball]

In the QWidget subclass object construtor, add this line:

this->move(QApplication::desktop()->screen()->rect().center()-this->rect().center());

[raphaelf]

Hi everybody!!

Now i have a lot of solutions :p

It works :p

Thanks to all



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


QApplication app(argc, argv);
app.setStyle("plastique");
app.setPalette( app.style()->standardPalette() );
MainWindow m;
m.setMinimumSize(451,600);
m.setMaximumSize(451,600);
QRect r = m.geometry();
r.moveCenter(QApplication::desktop()->availableGeometry().center());
m.setGeometry(r);

m.show();
return app.exec();
}

[8Observer8]

These functions are obsolete:


QApplication::desktop()->screenGeometry()
QApplication::desktop()->availableGeometry()
QDesktopWidget::screen()


Use QScreen instead:



#include "MainWindow.h"
#include "ui_MainWindow.h"
#include <QScreen>

MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
move(QGuiApplication::screens().at(0)->geometry().center() - frameGeometry().center());
}