lib/cpBaseQtApplication/Blocker.cxx

   1 #include <cpBaseQtApplication/Blocker.h>
   2 #include <QApplication>
   3
   4 // -------------------------------------------------------------------------
   5 cpBaseQtApplication::Blocker::
   6 Blocker( )
   7   : QObject( )
   8 {
   9 }
  10
  11 // -------------------------------------------------------------------------
  12 cpBaseQtApplication::Blocker::
  13 ~Blocker( )
  14 {
  15 }
  16
  17 // -------------------------------------------------------------------------
  18 void cpBaseQtApplication::Blocker::
  19 block( )
  20 {
  21   QApplication* app =
  22     dynamic_cast< QApplication* >( QApplication::instance( ) );
  23   if( app != NULL )
  24   {
  25     app->setOverrideCursor( Qt::WaitCursor );
  26     app->installEventFilter( this );
  27
  28   } // fi
  29 }
  30
  31 // -------------------------------------------------------------------------
  32 void cpBaseQtApplication::Blocker::
  33 unblock( )
  34 {
  35   QApplication* app =
  36     dynamic_cast< QApplication* >( QApplication::instance( ) );
  37   if( app != NULL )
  38   {
  39     while( app->overrideCursor( ) )
  40       app->restoreOverrideCursor( );
  41     app->removeEventFilter( this );
  42
  43   } // fi
  44 }
  45
  46 // -------------------------------------------------------------------------
  47 bool cpBaseQtApplication::Blocker::
  48 eventFilter( QObject* obj, QEvent* event )
  49 {
  50   return( true ); // -> Block all events
  51   /* NOTE: this should be the correct implementation:
  52      switch( event->type( ) )
  53      {
  54      //list event you want to prevent here ...
  55      case QEvent::KeyPress:
  56      case QEvent::KeyRelease:
  57      case QEvent::MouseButtonRelease:
  58      case QEvent::MouseButtonPress:
  59      case QEvent::MouseButtonDblClick:
  60      //...
  61      return( true );
  62      } // hctiws
  63      return( this->QObject::eventFilter( obj, event ) );
  64   */
  65 }
  66
  67 // eof - $RCSfile$