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282 lines (255 loc) · 9.22 KB
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/*
*
* Copyright (C) 2010 MeVis Medical Solutions AG All Rights Reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Contact information: MeVis Medical Solutions AG, Universitaetsallee 29,
* 28359 Bremen, Germany or:
*
* http://www.mevis.de
*
*/
//----------------------------------------------------------------------------------
/*!
// \file PythonQtSignalReceiver.cpp
// \author Florian Link
// \author Last changed by $Author: florian $
// \date 2006-05
*/
//----------------------------------------------------------------------------------
#include "PythonQtSignalReceiver.h"
#include "PythonQtClassInfo.h"
#include "PythonQtMethodInfo.h"
#include "PythonQtConversion.h"
#include <QMetaObject>
#include <QMetaMethod>
#include "funcobject.h"
// use -2 to signal that the variable is uninitialized
int PythonQtSignalReceiver::_destroyedSignal1Id = -2;
int PythonQtSignalReceiver::_destroyedSignal2Id = -2;
void PythonQtSignalTarget::call(void **arguments) const {
PYTHONQT_GIL_SCOPE
PyObject* result = call(_callable, methodInfo(), arguments);
Py_XDECREF(result);
}
PyObject* PythonQtSignalTarget::call(PyObject* callable, const PythonQtMethodInfo* methodInfos, void **arguments, bool skipFirstArgumentOfMethodInfo)
{
Q_UNUSED(skipFirstArgumentOfMethodInfo)
// Note: we check if the callable is a PyFunctionObject and has a fixed number of arguments
// if that is the case, we only pass these arguments to python and skip the additional arguments from the signal
int numPythonArgs = -1;
if (PyFunction_Check(callable)) {
PyObject* o = callable;
PyFunctionObject* func = (PyFunctionObject*)o;
PyCodeObject* code = (PyCodeObject*)func->func_code;
if (!(code->co_flags & CO_VARARGS)) {
numPythonArgs = code->co_argcount;
} else {
// variable numbers of arguments allowed
}
} else if (PyMethod_Check(callable)) {
PyObject* o = callable;
PyMethodObject* method = (PyMethodObject*)o;
if (PyFunction_Check(method->im_func)) {
PyFunctionObject* func = (PyFunctionObject*)method->im_func;
PyCodeObject* code = (PyCodeObject*)func->func_code;
if (!(code->co_flags & CO_VARARGS)) {
numPythonArgs = code->co_argcount - 1; // we subtract one because the first is "self"
} else {
// variable numbers of arguments allowed
}
}
}
const PythonQtMethodInfo* m = methodInfos;
// parameterCount includes return value:
int count = m->parameterCount();
if (numPythonArgs!=-1) {
if (count>numPythonArgs+1) {
// take less arguments
count = numPythonArgs+1;
}
}
PythonQtObjectPtr pargs;
if (count>1) {
pargs.setNewRef(PyTuple_New(count-1));
}
bool err = false;
// transform Qt values to Python
const QList<PythonQtMethodInfo::ParameterInfo>& params = m->parameters();
for (int i = 1; i < count; i++) {
const PythonQtMethodInfo::ParameterInfo& param = params.at(i);
PyObject* arg = PythonQtConv::ConvertQtValueToPython(param, arguments[i]);
if (arg && (param.pointerCount == 1) && (param.name == "PyObject")) {
// ConvertQtValueToPython does not ref-count the PyObject, so we have to
// do it ourselves...
Py_INCREF(arg);
}
if (arg) {
// steals reference, no unref
PyTuple_SetItem(pargs, i-1, arg);
} else {
err = true;
break;
}
}
PyObject* result = NULL;
if (!err) {
PyErr_Clear();
result = PyObject_CallObject(callable, pargs);
if (result) {
// ok
} else {
PythonQt::self()->handleError();
}
}
return result;
}
bool PythonQtSignalTarget::isSame( int signalId, PyObject* callable ) const
{
return PyObject_RichCompareBool(callable, _callable, Py_EQ) && (signalId == _signalId);
}
//------------------------------------------------------------------------------
PythonQtSignalReceiver::PythonQtSignalReceiver(QObject* obj):PythonQtSignalReceiverBase(obj)
{
if (_destroyedSignal1Id == -2) {
// initialize these once
_destroyedSignal1Id = QObject::staticMetaObject.indexOfSignal("destroyed()");
_destroyedSignal2Id = QObject::staticMetaObject.indexOfSignal("destroyed(QObject*)");
if (_destroyedSignal1Id == -1 || _destroyedSignal2Id == -1) {
std::cerr << "PythonQt: could not find destroyed signal index, should never happen!" << std::endl;
}
}
_destroyedSignalCount = 0;
_obj = obj;
// fetch the class info for object, since we will need to for correct enum resolution in
// signals
_objClassInfo = PythonQt::priv()->getClassInfo(obj->metaObject());
if (!_objClassInfo || !_objClassInfo->isQObject()) {
PythonQt::self()->registerClass(obj->metaObject());
_objClassInfo = PythonQt::priv()->getClassInfo(obj->metaObject());
}
// force decorator/enum creation
_objClassInfo->decorator();
_slotCount = staticMetaObject.methodOffset();
}
PythonQtSignalReceiver::~PythonQtSignalReceiver()
{
// we need the GIL scope here, because the targets keep references to Python objects
PYTHONQT_GIL_SCOPE;
PythonQt::priv()->removeSignalEmitter(_obj);
_targets.clear();
}
bool PythonQtSignalReceiver::addSignalHandler(const char* signal, PyObject* callable)
{
bool flag = false;
int sigId = getSignalIndex(signal);
if (sigId>=0) {
// create PythonQtMethodInfo from signal
QMetaMethod meta = _obj->metaObject()->method(sigId);
const PythonQtMethodInfo* signalInfo = PythonQtMethodInfo::getCachedMethodInfo(meta, _objClassInfo);
PythonQtSignalTarget t(sigId, signalInfo, _slotCount, callable);
_targets.append(t);
// now connect to ourselves with the new slot id
QMetaObject::connect(_obj, sigId, this, _slotCount, Qt::AutoConnection, 0);
_slotCount++;
flag = true;
if (sigId == _destroyedSignal1Id || sigId == _destroyedSignal2Id) {
_destroyedSignalCount++;
if (_destroyedSignalCount==1) {
// make ourself parent of PythonQt, to not get deleted as a child of the QObject we are
// listening to, since we do that manually when we receive the destroyed signal
this->setParent(PythonQt::priv());
}
}
}
return flag;
}
bool PythonQtSignalReceiver::removeSignalHandler(const char* signal, PyObject* callable)
{
int foundCount = 0;
int sigId = getSignalIndex(signal);
if (sigId>=0) {
QMutableListIterator<PythonQtSignalTarget> i(_targets);
if (callable) {
while (i.hasNext()) {
if (i.next().isSame(sigId, callable)) {
QMetaObject::disconnect(_obj, sigId, this, i.value().slotId());
i.remove();
foundCount++;
break;
}
}
} else {
while (i.hasNext()) {
if (i.next().signalId() == sigId) {
QMetaObject::disconnect(_obj, sigId, this, i.value().slotId());
i.remove();
foundCount++;
}
}
}
}
if ((foundCount>0) && (sigId == _destroyedSignal1Id) || (sigId == _destroyedSignal2Id)) {
_destroyedSignalCount -= foundCount;
if (_destroyedSignalCount==0) {
// make ourself child of QObject again, to get deleted when the object gets deleted
this->setParent(_obj);
}
}
return foundCount>0;
}
int PythonQtSignalReceiver::getSignalIndex(const char* signal)
{
int sigId = _obj->metaObject()->indexOfSignal(signal+1);
if (sigId<0) {
QByteArray tmpSig = QMetaObject::normalizedSignature(signal+1);
sigId = _obj->metaObject()->indexOfSignal(tmpSig);
}
return sigId;
}
int PythonQtSignalReceiver::qt_metacall(QMetaObject::Call c, int id, void **arguments)
{
// mlabDebugConst("PythonQt", "PythonQtSignalReceiver invoke " << _obj->className() << " " << _obj->name() << " " << id);
if (c != QMetaObject::InvokeMetaMethod) {
QObject::qt_metacall(c, id, arguments);
}
bool shouldDelete = false;
for(const PythonQtSignalTarget& t : _targets) {
if (t.slotId() == id) {
const int sigId = t.signalId();
t.call(arguments);
// if the signal is the last destroyed signal, we delete ourselves
if ((sigId == _destroyedSignal1Id) || (sigId == _destroyedSignal2Id)) {
_destroyedSignalCount--;
if (_destroyedSignalCount == 0) {
shouldDelete = true;
}
}
break;
}
}
if (shouldDelete) {
delete this;
}
return 0;
}
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