Hi all,
I tried to add a transparency effect when the user HoverLeave or HoverEnter the dialog.
It works great the problem is that when leaving the dialog I have this wierd black dialog for a minute...
I added the exact code I'm using I'll be happy if you could comment out the problem
Qt Code: 
  1. const int steps = 10;
  2. const double stride = 0.5 / steps;
  3.  
  4. class faderIn : public QThread
  5. {
  6.     public:
  7.     faderIn(MainWindow* instance)
  8.     {
  9.         m_instance = instance;
  10.     }
  11.     virtual void run()
  12.     {
  13.         while( m_instance->windowOpacity() < 1 )
  14.         {
  15.             msleep( 10 );
  16.             m_instance->setWindowOpacity(m_instance->windowOpacity() + stride);
  17.         }
  18.         m_instance->setWindowOpacity(1);
  19.     }
  20.  
  21.     private:
  22.       MainWindow*   m_instance;
  23. };
  24. class faderOut : public QThread
  25. {
  26.     public:
  27.     faderOut(MainWindow* instance)
  28.     {
  29.         m_instance = instance;
  30.     }
  31.     virtual void run()
  32.     {
  33.         while( m_instance->windowOpacity() > 0.5) {
  34.             msleep( 10 );
  35.  
  36.            m_instance->setWindowOpacity(m_instance->windowOpacity() - stride);
  37.         }
  38.         m_instance->setWindowOpacity(0.5);
  39.     }
  40.  
  41.     private:
  42.       MainWindow*   m_instance;
  43. };
  44. class newMain : public MainWindow
  45. {
  46. protected:
  47.     bool event( QEvent * e )
  48.     {
  49.         bool retVal = MainWindow::event(e);
  50.         if (e->type() == QEvent::HoverEnter)
  51.         {
  52.             faderIn(this).run();
  53.         }
  54.         if (e->type() == QEvent::HoverLeave)
  55.         {
  56.             faderOut(this).run();
  57.         }
  58.         return retVal;
  59.  
  60.     }
  61.  
  62.  
  63. };
  64. int main(int argc, char *argv[])
  65. {
  66.     QApplication a(argc, argv);
  67.     newMain w;
  68.  
  69.     w.show();
  70.     return a.exec();
  71. }
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