include/wvqthook.h

   1 /* -*- Mode: C++ -*-
   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 #ifndef __WVQTHOOK_H
  11 #define __WVQTHOOK_H
  12
  13 #include <qobject.h>
  14 #include <qevent.h>
  15 #include "wvtr1.h"
  16
  17 class WvQtHook;
  18 // parameters are: WvQtHook &, int type, void *data
  19 typedef wv::function<void(WvQtHook&, int, void*)> WvQtHookCallback;
  20
  21 class WvQtHook : public QObject
  22 {
  23     Q_OBJECT
  24     WvQtHookCallback callback;
  25
  26 public:
  27     WvQtHook(WvQtHookCallback _callback = NULL);
  28
  29     // sets the callback function to be invoked
  30     void setcallback(WvQtHookCallback _callback);
  31
  32     // posts an event to the Qt event loop to be sent to the
  33     // attached callback later
  34     void post(int type = 0, void *data = NULL);
  35
  36     // sends an event to the attached callback now
  37     void send(int type = 0, void *data = NULL);
  38
  39     // internal
  40     virtual bool event(QEvent *event);
  41 };
  42
  43 #endif // __WVQTHOOK_H