(C++) How to put a dialog on the screen's center?

 

QT FAQ.

 

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#include <QDesktopWidget> Dialog::Dialog(QWidget *parent) :     QDialog(parent),     ui(new Ui::Dialog) {   ui->setupUi(this);   //Put the dialog in the screen center   const QRect screen = QApplication::desktop()->screenGeometry();   this->move( screen.center() - this->rect().center() ); }

 

 

 

 

 

Complete source code

 

Operating system: Ubuntu

IDE: Qt Creator 2.0.0

Project type: Qt4 GUI Application

Compiler: G++ 4.4.1

Libraries used:

• Qt: version 4.7.0 (32 bit)

 

• Download the Qt Creator project 'CppQtDialogOnScreenCenter' (zip)

 

 

 

 

 

main.cpp

 

Not a single line is changed from the default created main.

 

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#include <QtGui/QApplication> #include "dialog.h" int main(int argc, char *argv[]) {   QApplication a(argc, argv);   Dialog w;   w.show();   return a.exec(); }

 

 

 

 

 

dialog.h

 

Not a single line is changed from the default created dialog.h.

 

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#ifndef DIALOG_H #define DIALOG_H #include <QDialog> namespace Ui {     class Dialog; } class Dialog : public QDialog {     Q_OBJECT public:     explicit Dialog(QWidget *parent = 0);     ~Dialog(); protected:     void changeEvent(QEvent *e); private:     Ui::Dialog *ui; }; #endif // DIALOG_H

 

 

 

 

 

dialog.cpp

 

The only file where changed are added.

 

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#include <QDesktopWidget> #include "dialog.h" #include "ui_dialog.h" Dialog::Dialog(QWidget *parent) :     QDialog(parent),     ui(new Ui::Dialog) {   ui->setupUi(this);   //Move the dialog away from the center   this->setGeometry(0,0,this->width(),this->height());   //Put the dialog in the screen center   const QRect screen = QApplication::desktop()->screenGeometry();   this->move( screen.center() - this->rect().center() ); } Dialog::~Dialog() {   delete ui; } void Dialog::changeEvent(QEvent *e) {   QDialog::changeEvent(e);   switch (e->type()) {   case QEvent::LanguageChange:     ui->retranslateUi(this);     break;   default:     break;   } }