How do I create a Window in different QT threads?

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If you need to create QWidget(or some other gui component(s)) in different(non-main) thread(s) you can implement it in such way:

  • Create simple wrapper which holds gui component:

    // gui component holder which will be moved to main thread
class gui_launcher : public QObject
{
  QWidget *w;
  // other components
  //..
public:
  virtual bool event( QEvent *ev )
  {   
    if( ev->type() == QEvent::User )
    {
      w = new QWidget;
      w->show();
      return true;
    }
    return false;
  }
};

  • create QApplication object in main thread

  • another thread body:

    ..
  // create holder
  gui_launcher gl;
  // move it to main thread
  gl.moveToThread( QApplication::instance()->thread() );
  // send it event which will be posted from main thread
  QCoreApplication::postEvent( &gl, new QEvent( QEvent::User ) );
..

  • be happy, 🙂

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