Quote Originally Posted by wysota View Post
Could you prepare a minimal compilable example reproducing the problem?
Sorry for the delayed response...here comes the 'minimal' example. When run on my system the main window does not become disabled unless i use the centralwidget-object

Qt Code: 
  1. #include <iostream>
  2. #include <QApplication>
  3. #include <QMainWindow>
  4. #include <QWidget>
  5. #include <QPushButton>
  6. #include <QString>
  7. //#include <QRect>
  8. //#include <QSize>
  9. //
  10. using namespace std;
  11. //
  12. class Gui : public QMainWindow
  13. {
  14. 	Q_OBJECT
  15. public:
  16. 	Gui( QWidget * parent = 0 );	
  17. private slots:
  18. 	void disableMe();
  19. private:
  20. 	QWidget *centralwidget;
  21. 	QPushButton *pushButton;
  22. };
  23.  
  24. int main(int argc, char ** argv)
  25. {
  26. 	QApplication app( argc, argv );
  27. 	Gui gui;
  28. 	gui.show(); 		     
  29. 	app.connect( &app, SIGNAL( lastWindowClosed() ), &app, SLOT( quit() ) );
  30. 	return app.exec();
  31. }
  32.  
  33. Gui::Gui( QWidget * parent ) : QMainWindow(parent)
  34. {	
  35. 	this->setObjectName(QString::fromUtf8("MainWindow"));
  36. 	this->setWindowTitle("main window test");
  37. 	centralwidget = new QWidget(this);
  38. 	centralwidget->setObjectName(QString::fromUtf8("centralwidget"));
  39. 	pushButton = new QPushButton(centralwidget);
  40. 	pushButton->setObjectName(QString::fromUtf8("pushButton"));
  41. 	pushButton->setGeometry(QRect(110, 50, 101, 41));
  42.    	pushButton->setText("disable?");
  43. 	this->setCentralWidget(centralwidget);
  44.  
  45. 	QSize size(322, 149);
  46. 	size = size.expandedTo(this->minimumSizeHint());
  47. 	this->resize(size);
  48.  
  49. 	connect(pushButton, SIGNAL(clicked()),
  50. 			this, SLOT(disableMe()));
  51. }
  52.  
  53. void Gui::disableMe()
  54. {
  55. 	cout << "trying to disable the mainwindow...";
  56. 	this->setDisabled(true);
  57. 	cout << "success?" << endl;
  58. }
To copy to clipboard, switch view to plain text mode