PyCallbackDispatcher.h

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#pragma once
// QPy - Copyright (c) 2012,2013 Ugo Varetto
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
//       documentation and/or other materials provided with the distribution.
//     * Neither the name of the author and copyright holder nor the
//       names of contributors to the project may be used to endorse or promote products
//       derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL UGO VARETTO BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include <Python.h>
#include <QObject>
#include <QMap>
#include <QList>

namespace qpy {

class PyContext;

typedef QList< PyArgWrapper > CBackParameterTypes;

//------------------------------------------------------------------------------
class PyCBackMethod {
public:
    PyCBackMethod( PyContext* pc, PyObject* pm, const CBackParameterTypes& p, PyObject* pyCBack ) 
        : pc_( pc ), pyModule_( pm ), paramTypes_( p ), pyCBack_( pyCBack ) {}
    void Invoke( void **arguments );
    PyObject* CBack() const{ return pyCBack_; }
    void DeleteCBack() { 
        Py_XDECREF( pyCBack_ );
        pyCBack_ = 0;
    } 
private:
    PyContext* pc_;
    CBackParameterTypes paramTypes_;
    PyObject* pyCBack_;
    PyObject* pyModule_;
};


typedef PyObject* PyCBack;
typedef int MethodId;

//------------------------------------------------------------------------------
class PyCallbackDispatcher : public QObject {
public:
    PyCallbackDispatcher( QObject* parent = 0 ) 
        : QObject( parent ), pc_( 0 ) {}
    PyCallbackDispatcher( PyContext* pc, PyObject* pm, QObject* parent = 0 ) 
        : pc_( pc ), QObject( parent ) {}
    int qt_metacall( QMetaObject::Call c, int id, void **arguments ); 
    bool Connect( QObject *obj, 
                  int signalIdx,
                  const CBackParameterTypes& paramTypes,
                  PyCBack pyCBack,
                  PyObject* module );
    bool Disconnect( QObject *obj, 
                     int signalIdx,
                     PyCBack pyCBack );
    void SetPyContext( PyContext* pc ) { pc_ = pc; };
    virtual ~PyCallbackDispatcher() {
        for( QMap< int, PyCBackMethod* >::iterator i = pyCBackMethods_.begin();
             i != pyCBackMethods_.end(); ++i ) {
            Py_XDECREF( i.value()->CBack() );
            delete *i;
        }
    }
private:
    int GetMethodIndex() const {
        return methodIdx_++;
    }    
private:
    PyContext* pc_;
    //QList< PyCBackMethod* > pyCBackMethods_;
    QMap< int, PyCBackMethod* > pyCBackMethods_;
    QMap< PyCBack, MethodId > cbackToMethodIndex_;

    static int methodIdx_; //thread_local
   
};
}