activate window

[parmar ranjit]

hi ,
Can any body please help in following problem:
My Qt program opens main window, clicking on menu of which i m opening another window. I m to edit using mouse to already drawn boxes on that window. But my problem is that widow is always displayed behind main window and it neither becomes active nor takes mouse events nor closes....!
However clicking on menu of same central widget: which opens ceratin data in text editor , works nicely, it is displayed in front as well as active too....!
i have trie d using activate Winow(), raise(), lower () etc,, bt yet teh problem persists..
Is it possible to have higher priority for this window to activate?

sample constuctor for main widget: MainWindow::MainWindow(QWidget *parent)
{ ui.setupUi(this); }

sample constuctor for widget not becomes activate:MyWidget::MyWidget(int r,QImage image,QWidget* parent)
Thanx
Ranjit

[wysota]

Could we see some more code of yours?

[parmar ranjit]

Thnx for reply,
i m using QtDesigner4.3.2.
My question is that why the central widget developed in Qt Designer is displayed in front ?
Actually on clicking certain menu of central widget i would like to open another window in front of central widget( & further I would like to rubberband certain boxes on that window's image using mouse.
On clicking it is displayed but behind the central widget... and why does not it take mouse events? The minimize & maximize buttons on this window responds but Close button does not ...!!!!!! so it is not possible to even close it except by terminating the program...

Following is sample code.

void process1::box() 
     {
 
	QWidget *par;
	MyWidget *w=new MyWidget(22,image,par);
        w->showMaximized();
	w->raise();         //even tried this but My Widget is displayed behind GUI designed                                 
	                        // central widget
        w->setFocus () ;   // no effect even after focussing         
    	w->show();
	}
 
MyWidget::MyWidget(int r, QImage image,  QWidget* parent)
      {   	
 		 ............
                  ..................
		  parent->setGeometry(100,100,300,300);
		  //  parent->activateWindow ();
		  QImage myImage("Sample Image.jpg");
		  QPixmap pm = QPixmap :: fromImage(myImage);
		  m_pixmapLabel = new QLabel(parent);
          	  m_pixmapLabel->setPixmap(pm);
            for(................)
        {.......
          ...........
        show();
        }
      }
 
 
 
void MyWidget::mouseMoveEvent(QMouseEvent *event)
      { 		
		rubberBand->setGeometry(QRect(origin, event->pos()).normalized());  			
	  }  
 
 
void MyWidget::mousePressEvent(QMouseEvent *event)
    {
	  		origin = event->pos(); 
 			cout<<"x event "<< event->x()<<"y event "<< event->y()<<endl; 		
			rubberBand = new QRubberBand(QRubberBand::Rectangle, m_pixmapLabel);
			rubberBand->setGeometry(QRect(origin, QSize(0,0)));	
			rubberBand->show();				
	}		
 
 
void MyWidget::mouseReleaseEvent(QMouseEvent *event)
      {	........
.........show();.....}

void process1::box() 
     {
	
	QWidget *par;
	MyWidget *w=new MyWidget(22,image,par);
        w->showMaximized();
	w->raise();         //even tried this but My Widget is displayed behind GUI designed                                 
	                        // central widget
        w->setFocus () ;   // no effect even after focussing         
    	w->show();
	}

MyWidget::MyWidget(int r, QImage image,  QWidget* parent)
      {   	
 		 ............
                  ..................
		  parent->setGeometry(100,100,300,300);
		  //  parent->activateWindow ();
		  QImage myImage("Sample Image.jpg");
		  QPixmap pm = QPixmap :: fromImage(myImage);
		  m_pixmapLabel = new QLabel(parent);
          	  m_pixmapLabel->setPixmap(pm);
            for(................)
        {.......
          ...........
        show();
        }
      }
     


void MyWidget::mouseMoveEvent(QMouseEvent *event)
      { 		
		rubberBand->setGeometry(QRect(origin, event->pos()).normalized());  			
	  }  


void MyWidget::mousePressEvent(QMouseEvent *event)
    {
	  		origin = event->pos(); 
 			cout<<"x event "<< event->x()<<"y event "<< event->y()<<endl; 		
			rubberBand = new QRubberBand(QRubberBand::Rectangle, m_pixmapLabel);
			rubberBand->setGeometry(QRect(origin, QSize(0,0)));	
			rubberBand->show();				
	}		


void MyWidget::mouseReleaseEvent(QMouseEvent *event)
      {	........
.........show();.....}

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So how is it possible to bring front this My Widget in front of the GUI based central widget?
I hope I have been able to make u understand the problem...!

[wysota]

If you want to open another window, create a parentless widget or a subclass of QDialog (regardless if it has a parent or not).

[parmar ranjit]

how can i create parent less widget? Do i need to change the constructor simplu\y?

[wysota]

Pass 0 as the parent argument to the constructor. It's usually the last argument and it defaults to 0, so you might just skip it.

Your code needs major changes, by the way... I see at least two incorrect approaches there.

[parmar ranjit]

I had also tried to pass zero in two different ways as below:

MyWidget ( int r, Qimage image QWidget *parent =0);

MyWidget( QWidget * parent=0, Qt::WindowFlags f=0 );

Further i tried alot to activate using Activate Window but failed to do so..
thanx for taking interest..
will you please tell me @ simple way to just activate that window as t\o have mouse events?

[wysota]

You don't need any special treatment to receive mouse events. A window is active when you click on it or call QApplication::setActiveWindow(). How come you know you don't receive events for the widget?

[parmar ranjit]

by printing mouse event position( which are not getting printed) as well as isActive Window boolian function ( which returns false)

[wysota]

Ok, let's start from the beginning - what is the final effect you are trying to obtain? Try to be as precise in explaining as you can, this will allow us to solve the problem faster. I see you are doing something with some image and you want to do rubberbanding but it's not clear for me how this blends together...

By the way - "not getting printed" doesn't yet mean "not getting executed"...

[parmar ranjit]

thanx. To begin with the objective is something like this:
i have prepared one GUI by Qt Designer, Clicking on one menu named "work1" of its menu bar, should open one another window, which contains scanned image of of a picture,say of 20 persons . On which i have drawn certain editable boxes around these individual person using QRubberband. I should be able to edit those rubberband boxes of that window.

Let me clarify more that without using GUI , i m able to show and edit those rubberbanded boxes using mouse.My program runs absolutely good without GUI linking.

But after linking it to GUI , some where some thing goes wrong, every thing works fine except that " this window falls behind the GUI window. So it is clear that there seems to be problem in linking, or calling or constructors or priority may be any thing like that.

Now i hope I have made to understand my objective and problem....!

So i tried to activate and bring front that window but I failed in that case only...


Regarding yr query of mouse events:
I have used following code to see if mouse events occur.

void MyWidget::mousePressEvent(QMouseEvent *event)
    {
	  		origin = event->pos(); 
 			cout<<"x event "<< event->x()<<"y event "<< event->y()<<endl;}

void MyWidget::mousePressEvent(QMouseEvent *event)
    {
	  		origin = event->pos(); 
 			cout<<"x event "<< event->x()<<"y event "<< event->y()<<endl;}

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Perhaps today i have disturbed u alot.....! Thnx for guidance..

[wysota]

thanx. To begin with the objective is something like this:
i have prepared one GUI by Qt Designer, Clicking on one menu named "work1" of its menu bar, should open one another window, which contains scanned image of of a picture,say of 20 persons . On which i have drawn certain editable boxes around these individual person using QRubberband. I should be able to edit those rubberband boxes of that window.

Ok, seems simple enough...

So it is clear that there seems to be problem in linking, or calling or constructors or priority may be any thing like that.

Or overall code design and understanding of Qt

So i tried to activate and bring front that window but I failed in that case only...

Let's clearly state what we have. Do you actually have two windows? With separate title bars, etc.? Can you move them around on your screen?

Regarding yr query of mouse events:
I have used following code to see if mouse events occur.
void MyWidget::mousePressEvent(QMouseEvent *event)
{
origin = event->pos();
cout<<"x event "<< event->x()<<"y event "<< event->y()<<endl;}

This would be more convincing:

void MyWidget::mousePressEvent(QMouseEvent *event){
  QMessageBox::information(this, "Click!", QString("Click occured at %1x%2").arg(event->pos().x()).arg(event->pos().y()));
}

void MyWidget::mousePressEvent(QMouseEvent *event){
  QMessageBox::information(this, "Click!", QString("Click occured at %1x%2").arg(event->pos().x()).arg(event->pos().y()));
}

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[parmar ranjit]

oh Thnx indeed ...
I have been able to cop up with the problem using QDialog and setModal

Again thank you very much
Ranjit