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qgpgme

eventloopinteractor_win.cpp

00001 /* qeventloopinteractor.cpp
00002    Copyright (C) 2003 Klarälvdalens Datakonsult AB
00003 
00004    This file is part of QGPGME.
00005 
00006    QGPGME is free software; you can redistribute it and/or modify it
00007    under the terms of the GNU Library General Public License as published
00008    by the Free Software Foundation; either version 2 of the License, or
00009    (at your option) any later version.
00010 
00011    QGPGME is distributed in the hope that it will be useful, but
00012    WITHOUT ANY WARRANTY; without even the implied warranty of
00013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014    GNU Library General Public License for more details.
00015 
00016    You should have received a copy of the GNU Library General Public License
00017    along with QGPGME; see the file COPYING.LIB.  If not, write to the
00018    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00019    Boston, MA 02110-1301, USA. */
00020 
00021 // -*- c++ -*-
00022 
00023 #include <qgpgme/eventloopinteractor.h>
00024 
00025 #include <gpgme++/global.h>
00026 
00027 #include <QIODevice>
00028 #include <QSignalMapper>
00029 
00030 Q_GLOBAL_STATIC( QSignalMapper, readSignalMapper  )
00031 Q_GLOBAL_STATIC( QSignalMapper, writeSignalMapper )
00032 
00033 static QSignalMapper * setupReadSignalMapper( QObject * o ) {
00034     QSignalMapper * sm = readSignalMapper();
00035     o->connect( sm, SIGNAL(mapped(int)), SLOT(slotReadActivity(int)) );
00036     return sm;
00037 }
00038 
00039 static QSignalMapper * setupWriteSignalMapper( QObject * o ) {
00040     QSignalMapper * sm = writeSignalMapper();
00041     o->connect( sm, SIGNAL(mapped(int)), SLOT(slotWriteActivity(int)) );
00042     return sm;
00043 }
00044 
00045 namespace {
00046     struct IO {
00047         QIODevice * device;
00048         QGpgME::EventLoopInteractor::Direction direction;
00049     };
00050 }
00051 
00052 void * QGpgME::EventLoopInteractor::registerWatcher( int fd, Direction dir, bool & ok ) {
00053     QIODevice * const iod = GpgME::getQIODevice( fd );
00054     if ( !iod ) {
00055         ok = false;
00056         return 0;
00057     }
00058     if ( dir == Read ) {
00059         static QSignalMapper * rsm = setupReadSignalMapper( this );
00060     if ( !rsm->mapping( fd ) ) {
00061             rsm->setMapping( iod, fd );
00062             connect( iod, SIGNAL(readyRead()), rsm, SLOT(map()) );
00063     } else {
00064             // if this fd is already registered, gpgme registers an additional
00065             // callback for the same fd.
00066             // if there is already something to read when registering the new 
00067         // callback, gpgme expects the new callback to be called, so we
00068             // trigger it"
00069             QMetaObject::invokeMethod( this, "slotReadActivity", Qt::QueuedConnection, Q_ARG( int, fd ) );
00070         }
00071     } else {
00072         static QSignalMapper * wsm = setupWriteSignalMapper( this );
00073     if ( !wsm->mapping( fd ) ) {
00074             wsm->setMapping( iod, fd );
00075             connect( iod, SIGNAL(bytesWritten(qint64)), wsm, SLOT(map()) );
00076     } else {
00077             // if this fd is already registered, gpgme registers an additional 
00078             // callback for the same fd.
00079             // if the device is writable when registering the new 
00080         // callback, gpgme expects the new callback to be called, so we
00081             // trigger it:
00082             QMetaObject::invokeMethod( this, "slotWriteActivity", Qt::QueuedConnection, Q_ARG( int, fd ) );            
00083     }
00084     }
00085 
00086     ok = true;
00087     IO * const io = new IO;
00088     io->device = iod;
00089     io->direction = dir;
00090     iod->bytesAvailable(); //HACK: tell KDPipeIODevices to start their threads
00091     iod->bytesToWrite();
00092     return io;
00093 }
00094 
00095 void QGpgME::EventLoopInteractor::unregisterWatcher( void * tag ) {
00096     if ( !tag )
00097         return;
00098     const IO * const io = static_cast<IO*>( tag );
00099     if ( io->direction == Read ) {
00100         // no setupReadSignalMapper here, since registerWatcher,
00101         // called before us, is guaranteed to have set it up
00102         static QSignalMapper * rsm = readSignalMapper();
00103         disconnect( io->device, SIGNAL(readyRead()), rsm, SLOT(map()) );
00104     } else {
00105         static QSignalMapper * wsm = writeSignalMapper();
00106         disconnect( io->device, SIGNAL(bytesWritten(qint64)), wsm, SLOT(map()) );
00107     }
00108     delete io;
00109 }

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