[Qt-interest] repaint()

[Atlant Schmidt]

Phil:

  I'm unclear on where the "data ready to be redrawn"
  has any opportunity to be effective. That is, when
  you're within the for loop, Qt is asked to do the
  repaint() and has the opportunity to do the repaint
  (when you call processEvents()), but what has actually
  changed that will paint any differently than the last
  time the loop invoked the repaint?

                         Atlant

-----Original Message-----
From: qt-interest-bounces at trolltech.com [mailto:qt-interest-bounces at trolltech.com] On Behalf Of phil prentice
Sent: Tuesday, September 21, 2010 08:39
To: qt-interest at trolltech.com
Subject: [Qt-interest] repaint()

Hi everyone

  I would be grateful for a little help using paintEvent().  I have an
application that has a "Continuous Button". I have implemented the slot using
the following basic code.
void VIwindow::continuousSlot()         // SLOT
{
  static bool running = false;
  if(m_continuousButton->text() == "Stop")
  {
    running = false;
    return;
  }
  else
  {
    running = true;
    m_continuousButton->setText("Stop");
    repaint();  // Force a direct update.   Works!!!
    for(;;)
    {
       // Update some widgets with data ready to be redrawn
      repaint();  // The widgets are not being drawn????
      // Check for stop being pressed.
      QCoreApplication::processEvents();
       if(!running)
         break;
    }
    m_continuousButton->setText("Continuous");
  }
}

The mechanism works very well except the repaint in the for loop does not do
anything.  I know this is probably a very basic question, but why??

Thankyou for your help

Phil
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