PythonQtSignalReceiver.cpp
273 lines
| 8.7 KiB
| text/x-c
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CppLexer
/ src / PythonQtSignalReceiver.cpp
ezust
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r0 | /* | ||
| * | ||||
florianlink
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r133 | * Copyright (C) 2010 MeVis Medical Solutions AG All Rights Reserved. | ||
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ezust
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r0 | * | ||
| * 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 | ||||
| * | ||||
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florianlink
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r133 | * Contact information: MeVis Medical Solutions AG, Universitaetsallee 29, | ||
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r0 | * 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> | ||||
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florianlink
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r4 | #include "funcobject.h" | ||
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ezust
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r0 | |||
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florianlink
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r180 | // use -2 to signal that the variable is uninitialized | ||
| int PythonQtSignalReceiver::_destroyedSignal1Id = -2; | ||||
| int PythonQtSignalReceiver::_destroyedSignal2Id = -2; | ||||
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florianlink
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r24 | void PythonQtSignalTarget::call(void **arguments) const { | ||
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florianlink
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r67 | PyObject* result = call(_callable, methodInfo(), arguments); | ||
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florianlink
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r24 | if (result) { | ||
| Py_DECREF(result); | ||||
| } | ||||
| } | ||||
| PyObject* PythonQtSignalTarget::call(PyObject* callable, const PythonQtMethodInfo* methodInfos, void **arguments, bool skipFirstArgumentOfMethodInfo) | ||||
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ezust
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r0 | { | ||
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florianlink
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r157 | Q_UNUSED(skipFirstArgumentOfMethodInfo) | ||
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florianlink
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r4 | // 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 | ||||
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florianlink
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r157 | |||
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florianlink
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r4 | int numPythonArgs = -1; | ||
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florianlink
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r24 | if (PyFunction_Check(callable)) { | ||
| PyObject* o = callable; | ||||
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florianlink
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r4 | PyFunctionObject* func = (PyFunctionObject*)o; | ||
| PyCodeObject* code = (PyCodeObject*)func->func_code; | ||||
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florianlink
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r173 | if (!(code->co_flags & CO_VARARGS)) { | ||
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florianlink
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r4 | numPythonArgs = code->co_argcount; | ||
| } else { | ||||
| // variable numbers of arguments allowed | ||||
| } | ||||
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florianlink
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r24 | } else if (PyMethod_Check(callable)) { | ||
| PyObject* o = callable; | ||||
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florianlink
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r4 | PyMethodObject* method = (PyMethodObject*)o; | ||
| if (PyFunction_Check(method->im_func)) { | ||||
| PyFunctionObject* func = (PyFunctionObject*)method->im_func; | ||||
| PyCodeObject* code = (PyCodeObject*)func->func_code; | ||||
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florianlink
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r173 | if (!(code->co_flags & CO_VARARGS)) { | ||
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florianlink
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r4 | numPythonArgs = code->co_argcount - 1; // we subtract one because the first is "self" | ||
| } else { | ||||
| // variable numbers of arguments allowed | ||||
| } | ||||
| } | ||||
| } | ||||
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florianlink
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r24 | const PythonQtMethodInfo* m = methodInfos; | ||
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florianlink
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r4 | // parameterCount includes return value: | ||
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ezust
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r0 | int count = m->parameterCount(); | ||
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florianlink
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r4 | if (numPythonArgs!=-1) { | ||
| if (count>numPythonArgs+1) { | ||||
| // take less arguments | ||||
| count = numPythonArgs+1; | ||||
| } | ||||
| } | ||||
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r0 | |||
| PyObject* pargs = NULL; | ||||
| if (count>1) { | ||||
| pargs = 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++) { | ||||
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florianlink
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r67 | const PythonQtMethodInfo::ParameterInfo& param = params.at(i); | ||
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ezust
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r0 | PyObject* arg = PythonQtConv::ConvertQtValueToPython(param, arguments[i]); | ||
| if (arg) { | ||||
| // steals reference, no unref | ||||
| PyTuple_SetItem(pargs, i-1,arg); | ||||
| } else { | ||||
| err = true; | ||||
| break; | ||||
| } | ||||
| } | ||||
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florianlink
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r24 | PyObject* result = NULL; | ||
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ezust
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r0 | if (!err) { | ||
| PyErr_Clear(); | ||||
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r24 | result = PyObject_CallObject(callable, pargs); | ||
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ezust
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r0 | if (result) { | ||
| // ok | ||||
| } else { | ||||
| PythonQt::self()->handleError(); | ||||
| } | ||||
| } | ||||
| if (pargs) { | ||||
| // free the arguments again | ||||
| Py_DECREF(pargs); | ||||
| } | ||||
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florianlink
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r24 | |||
| return result; | ||||
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ezust
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r0 | } | ||
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florianlink
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r160 | bool PythonQtSignalTarget::isSame( int signalId, PyObject* callable ) const | ||
| { | ||||
| return PyObject_Compare(callable, _callable) == 0 && signalId==_signalId; | ||||
| } | ||||
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ezust
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r0 | //------------------------------------------------------------------------------ | ||
| PythonQtSignalReceiver::PythonQtSignalReceiver(QObject* obj):PythonQtSignalReceiverBase(obj) | ||||
| { | ||||
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florianlink
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r180 | 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; | ||||
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ezust
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r0 | _obj = obj; | ||
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florianlink
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r157 | |||
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florianlink
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r54 | // 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(); | ||||
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ezust
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r0 | _slotCount = staticMetaObject.methodOffset(); | ||
| } | ||||
| PythonQtSignalReceiver::~PythonQtSignalReceiver() | ||||
| { | ||||
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florianlink
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r4 | PythonQt::priv()->removeSignalEmitter(_obj); | ||
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ezust
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r0 | } | ||
| 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); | ||||
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florianlink
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r54 | const PythonQtMethodInfo* signalInfo = PythonQtMethodInfo::getCachedMethodInfo(meta, _objClassInfo); | ||
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ezust
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r0 | 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; | ||||
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florianlink
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r180 | |||
| 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()); | ||||
| } | ||||
| } | ||||
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ezust
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r0 | } | ||
| return flag; | ||||
| } | ||||
| bool PythonQtSignalReceiver::removeSignalHandler(const char* signal, PyObject* callable) | ||||
| { | ||||
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florianlink
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r180 | int foundCount = 0; | ||
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ezust
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r0 | int sigId = getSignalIndex(signal); | ||
| if (sigId>=0) { | ||||
| QMutableListIterator<PythonQtSignalTarget> i(_targets); | ||||
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florianlink
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r173 | if (callable) { | ||
| while (i.hasNext()) { | ||||
| if (i.next().isSame(sigId, callable)) { | ||||
| i.remove(); | ||||
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florianlink
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r180 | foundCount++; | ||
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florianlink
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r173 | break; | ||
| } | ||||
| } | ||||
| } else { | ||||
| while (i.hasNext()) { | ||||
| if (i.next().signalId() == sigId) { | ||||
| i.remove(); | ||||
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florianlink
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r180 | foundCount++; | ||
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florianlink
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r173 | } | ||
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ezust
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r0 | } | ||
| } | ||||
| } | ||||
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florianlink
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r180 | 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; | ||||
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ezust
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r0 | } | ||
| 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); | ||||
| } | ||||
| foreach(const PythonQtSignalTarget& t, _targets) { | ||||
| if (t.slotId() == id) { | ||||
| t.call(arguments); | ||||
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florianlink
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r180 | // if the signal is the last destroyed signal, we delete ourselves | ||
| int sigId = t.signalId(); | ||||
| if ((sigId == _destroyedSignal1Id) || (sigId == _destroyedSignal2Id)) { | ||||
| _destroyedSignalCount--; | ||||
| if (_destroyedSignalCount == 0) { | ||||
| delete this; | ||||
| } | ||||
| } | ||||
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ezust
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r0 | break; | ||
| } | ||||
| } | ||||
| return 0; | ||||
| } | ||||