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