qt/wvqthook.cc

   1 /*
   2  * Worldvisions Weaver Software:
   3  *   Copyright (C) 1997-2002 Net Integration Technologies, Inc.
   4  *
   5  * A Qt object that invokes its callback whenever it receives
   6  * an event.  This is useful for deferring processing to the
   7  * Qt event loop.  Use it to avoid problems resulting from the
   8  * non-reentrant nature of WvStream::execute().
   9  */
  10 #include "wvqthook.moc"
  11
  12 WvQtHook::WvQtHook(WvQtHookCallback _callback) :
  13     callback(_callback)
  14 {
  15 }
  16
  17
  18 void WvQtHook::setcallback(WvQtHookCallback _callback)
  19 {
  20     callback = _callback;
  21 }
  22
  23
  24 bool WvQtHook::event(QEvent *event)
  25 {
  26     if (! callback)
  27         return false;
  28     QEvent::Type eventtype = event->type();
  29     if (eventtype < QEvent::User || eventtype > QEvent::MaxUser)
  30         return false;
  31     QCustomEvent *ce = static_cast<QCustomEvent*>(event);
  32     callback(*this, eventtype - QEvent::User, ce->data());
  33     return true;
  34 }
  35
  36
  37 void WvQtHook::post(int type, void *data)
  38 {
  39     // event must be allocated on heap for postEvent
  40     QEvent::Type eventtype = QEvent::Type(QEvent::User + type);
  41     QCustomEvent *event = new QCustomEvent(eventtype, data);
  42     QApplication::postEvent(this, event);
  43 }
  44
  45
  46 void WvQtHook::send(int type, void *data)
  47 {
  48     QEvent::Type eventtype = QEvent::Type(QEvent::User + type);
  49     QCustomEvent event(eventtype, data);
  50     QApplication::sendEvent(this, & event);
  51 }