summaryrefslogtreecommitdiffstats
path: root/libpyside/globalreceiver.cpp
blob: 5639c3d527a65b521b54656057a62cfbf1b76a1b (plain)
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
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
/*
* This file is part of the PySide project.
*
* Copyright (C) 2009-2010 Nokia Corporation and/or its subsidiary(-ies).
*
* Contact: PySide team <contact@pyside.org>
*
* 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.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/

#include "globalreceiver.h"
#include "dynamicqmetaobject_p.h"
#include "pysideweakref.h"

#include <QMetaMethod>
#include <QDebug>
#include <QEvent>
#include <QLinkedList>
#include <autodecref.h>
#include <sbkconverter.h>
#include <gilstate.h>

#include "typeresolver.h"
#include "signalmanager.h"

#define RECEIVER_DESTROYED_SLOT_NAME "__receiverDestroyed__(QObject*)"

namespace PySide
{
class DynamicSlotData
{
    public:
        DynamicSlotData(int id, PyObject* callback, GlobalReceiver* parent);
        void addRef(const QObject* o);
        void decRef(const QObject* o);
        void clear();
        int hasRefTo(const QObject* o) const;
        int refCount() const;
        int id() const;
        PyObject* call(PyObject* args);
        ~DynamicSlotData();
        static void onCallbackDestroyed(void* data);

    private:
        int m_id;
        bool m_isMethod;
        PyObject* m_callback;
        PyObject* m_pythonSelf;
        PyObject* m_pyClass;
        PyObject* m_weakRef;
        GlobalReceiver* m_parent;
        QLinkedList<const QObject*> m_refs;
};

}

using namespace PySide;

DynamicSlotData::DynamicSlotData(int id, PyObject* callback, GlobalReceiver* parent)
    : m_id(id), m_pythonSelf(0), m_pyClass(0), m_weakRef(0), m_parent(parent)
{
    Shiboken::GilState gil;

    m_isMethod = PyMethod_Check(callback);
    if (m_isMethod) {
        //Can not store calback pointe because this will be destroyed at the end of the scope
        //To avoid increment intance reference keep the callback information
        m_callback = PyMethod_GET_FUNCTION(callback);
#ifdef IS_PY3K
        m_pyClass = 0;
#else
        m_pyClass = PyMethod_GET_CLASS(callback);
#endif

        m_pythonSelf = PyMethod_GET_SELF(callback);

        //monitor class from method lifetime
        m_weakRef = WeakRef::create(m_pythonSelf, DynamicSlotData::onCallbackDestroyed, this);
    } else {
        m_callback = callback;
        Py_INCREF(m_callback);
    }
}

PyObject* DynamicSlotData::call(PyObject* args)
{
    PyObject* callback = m_callback;

    //create a callback based on method data
    Shiboken::GilState gil;
    if (m_isMethod)
#ifdef IS_PY3K
        callback = PyMethod_New(callback, m_pythonSelf);
#else
        callback = PyMethod_New(callback, m_pythonSelf, m_pyClass);
#endif

    PyObject* result =  PyObject_CallObject(callback, args);

    if (m_isMethod)
        Py_DECREF(callback);

    return result;
}

void DynamicSlotData::addRef(const QObject *o)
{
    m_refs.append(o);
}

void DynamicSlotData::decRef(const QObject *o)
{
    m_refs.removeOne(o);
}

int DynamicSlotData::refCount() const
{
    return m_refs.size();
}

int DynamicSlotData::id() const
{
    return m_id;
}

int DynamicSlotData::hasRefTo(const QObject *o) const
{
    return m_refs.count(o);
}

void DynamicSlotData::clear()
{
    Shiboken::GilState gil;
    Py_XDECREF(m_weakRef);
    m_weakRef = 0;
    m_refs.clear();
}

DynamicSlotData::~DynamicSlotData()
{
    Shiboken::GilState gil;
    clear();
    if (!m_isMethod)
       Py_DECREF(m_callback);
}

void DynamicSlotData::onCallbackDestroyed(void *data)
{
    Shiboken::GilState gil;
    DynamicSlotData* self = reinterpret_cast<DynamicSlotData*>(data);

    //Disconnect all sources
    QMetaMethod m = self->m_parent->metaObject()->method(self->m_id);
    QByteArray methodName = QByteArray::number(m.methodType()).append(m.signature());
    QLinkedList<const QObject*> sources = self->m_refs;
    foreach(const QObject* src, sources)
        const_cast<QObject*>(src)->disconnect(self->m_parent, methodName);
    self->m_weakRef = 0;
}

GlobalReceiver::GlobalReceiver()
    : m_metaObject(GLOBAL_RECEIVER_CLASS_NAME, &QObject::staticMetaObject)
{
    //slot used to be notifyed of object destrouction
    m_metaObject.addSlot(RECEIVER_DESTROYED_SLOT_NAME);
    m_metaObject.update();
    setObjectName("GLOBAL RECEIVER");
}

GlobalReceiver::~GlobalReceiver()
{
    while(!m_slotReceivers.empty()) {
        DynamicSlotData* data = m_slotReceivers.take(m_slotReceivers.begin().key());
        data->clear();
        delete data;
    }
}

void GlobalReceiver::connectNotify(QObject* source, int slotId)
{
    if (m_slotReceivers.contains(slotId)) {
        DynamicSlotData* data = m_slotReceivers[slotId];
        if (!data->hasRefTo(source))
            QObject::connect(source, SIGNAL(destroyed(QObject*)), this, "1"RECEIVER_DESTROYED_SLOT_NAME);
        data->addRef(source);
    }
}

void GlobalReceiver::disconnectNotify(QObject* source, int slotId)
{
   if (m_slotReceivers.contains(slotId)) {
        DynamicSlotData *data = m_slotReceivers[slotId];
        data->decRef(source);
        if (data->refCount() == 0)
            removeSlot(slotId);

        if (!hasConnectionWith(source))
            QObject::disconnect(source, SIGNAL(destroyed(QObject*)), this, "1"RECEIVER_DESTROYED_SLOT_NAME);
    }
}

const QMetaObject* GlobalReceiver::metaObject() const
{
    return m_metaObject.update();
}

int GlobalReceiver::addSlot(const char* slot, PyObject* callback)
{
    int slotId = m_metaObject.addSlot(slot);
    if (!m_slotReceivers.contains(slotId))
        m_slotReceivers[slotId] = new DynamicSlotData(slotId, callback, this);

    bool isShortCircuit = true;
    for (int i = 0; slot[i]; ++i) {
        if (slot[i] == '(') {
            isShortCircuit = false;
            break;
        }
    }

    if (isShortCircuit)
        m_shortCircuitSlots << slotId;

    Q_ASSERT(slotId >= QObject::staticMetaObject.methodCount());
    return slotId;
}

void GlobalReceiver::removeSlot(int slotId)
{
    if (m_slotReceivers.contains(slotId)) {
        delete m_slotReceivers.take(slotId);
        m_metaObject.removeSlot(slotId);
        m_shortCircuitSlots.remove(slotId);
    }
}

bool GlobalReceiver::hasConnectionWith(const QObject *object)
{
    QHash<int, DynamicSlotData*>::iterator i = m_slotReceivers.begin();
    while(i != m_slotReceivers.end()) {
        if (i.value()->hasRefTo(object)) {
            return true;
        }
        i++;
    }
    return false;
}

int GlobalReceiver::qt_metacall(QMetaObject::Call call, int id, void** args)
{
    Q_ASSERT(call == QMetaObject::InvokeMetaMethod);
    Q_ASSERT(id >= QObject::staticMetaObject.methodCount());
    QMetaMethod slot = metaObject()->method(id);
    Q_ASSERT(slot.methodType() == QMetaMethod::Slot);

    if (strcmp(slot.signature(), RECEIVER_DESTROYED_SLOT_NAME) == 0) {
        QObject *arg = *(QObject**)args[1];

        //avoid hash changes during the destruction
        QHash<int, DynamicSlotData*> copy = m_slotReceivers;
        QHash<int, DynamicSlotData*>::iterator i = copy.begin();
        while(i != copy.end()) {
            //Remove all refs
            int refs = i.value()->hasRefTo(arg);
            while(refs) {
                disconnectNotify(arg, i.key());
                refs--;
            }
            i++;
        }
        return -1;
    }

    DynamicSlotData* data = m_slotReceivers.value(id);
    if (!data) {
        qWarning() << "Unknown global slot, id:" << id;
        return -1;
    }

    Shiboken::GilState gil;
    PyObject* retval = 0;
    if (m_shortCircuitSlots.contains(id)) {
        retval = data->call(reinterpret_cast<PyObject*>(args[1]));
    } else {
        QList<QByteArray> paramTypes = slot.parameterTypes();
        Shiboken::AutoDecRef preparedArgs(PyTuple_New(paramTypes.count()));
        for (int i = 0, max = paramTypes.count(); i < max; ++i) {
            const QByteArray& paramType = paramTypes[i];
            Shiboken::Conversions::SpecificConverter converter(paramType.constData());
            PyTuple_SET_ITEM(preparedArgs.object(), i, converter.toPython(args[i+1]));
        }
        retval = data->call(preparedArgs);
    }

    if (!retval)
        PyErr_Print();
    else
        Py_DECREF(retval);

    return -1;
}