Skip to content
Navigation Menu
{{ message }}
forked from MeVisLab/pythonqt
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathPythonQtSignalReceiver.cpp
More file actions
290 lines (263 loc) · 9.39 KB
/
Copy pathPythonQtSignalReceiver.cpp
File metadata and controls
290 lines (263 loc) · 9.39 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
/*
*
* 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>
// 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);
if (result) {
PythonQt::priv()->checkAndRunCoroutine(result);
Py_DECREF(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;
}
}
PyObject* pargs = nullptr;
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++) {
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 = nullptr;
if (!err) {
PyErr_Clear();
result = PyObject_CallObject(callable, pargs);
if (result) {
// ok
} else {
PythonQt::self()->handleError();
}
}
if (pargs) {
// free the arguments again
Py_DECREF(pargs);
}
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()
{
if (PythonQt::priv()) {
// 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, nullptr);
_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 : qAsConst(_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;
}
You can’t perform that action at this time.