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// This implements the helpers for QMetaObject.
//
// Copyright (c) 2018 Riverbank Computing Limited <info@riverbankcomputing.com>
//
// This file is part of PyQt5.
//
// This file may be used under the terms of the GNU General Public License
// version 3.0 as published by the Free Software Foundation and appearing in
// the file LICENSE included in the packaging of this file. Please review the
// following information to ensure the GNU General Public License version 3.0
// requirements will be met: http://www.gnu.org/copyleft/gpl.html.
//
// If you do not wish to use this file under the terms of the GPL version 3.0
// then you may purchase a commercial license. For more information contact
// info@riverbankcomputing.com.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
#include <Python.h>
#include <QByteArray>
#include <QMetaMethod>
#include <QMetaObject>
#include <QObject>
#include "qpycore_api.h"
#include "qpycore_chimera.h"
#include "qpycore_misc.h"
#include "qpycore_objectified_strings.h"
#include "qpycore_public_api.h"
#include "sipAPIQtCore.h"
// Forward declarations.
static void connect(QObject *qobj, PyObject *slot_obj,
const QByteArray &slot_nm, const QByteArray &args);
void qpycore_qmetaobject_connectslotsbyname(QObject *qobj,
PyObject *qobj_wrapper)
{
// Get the class attributes.
PyObject *dir = PyObject_Dir((PyObject *)Py_TYPE(qobj_wrapper));
if (!dir)
return;
PyObject *slot_obj = 0;
for (Py_ssize_t li = 0; li < PyList_Size(dir); ++li)
{
PyObject *name_obj = PyList_GetItem(dir, li);
// Get the slot object.
Py_XDECREF(slot_obj);
slot_obj = PyObject_GetAttr(qobj_wrapper, name_obj);
if (!slot_obj)
continue;
// Ignore it if it is not a callable.
if (!PyCallable_Check(slot_obj))
continue;
// Use the signature attribute instead of the name if there is one.
PyObject *sigattr = PyObject_GetAttr(slot_obj,
qpycore_dunder_pyqtsignature);
if (sigattr)
{
for (Py_ssize_t i = 0; i < PyList_Size(sigattr); ++i)
{
PyObject *decoration = PyList_GetItem(sigattr, i);
Chimera::Signature *sig = Chimera::Signature::fromPyObject(decoration);
QByteArray args = sig->arguments();
if (!args.isEmpty())
connect(qobj, slot_obj, sig->name(), args);
}
Py_DECREF(sigattr);
}
else
{
const char *ascii_name = sipString_AsASCIIString(&name_obj);
if (!ascii_name)
continue;
PyErr_Clear();
connect(qobj, slot_obj, QByteArray(ascii_name), QByteArray());
Py_DECREF(name_obj);
}
}
Py_XDECREF(slot_obj);
Py_DECREF(dir);
}
// Connect up a particular slot name, with optional arguments.
static void connect(QObject *qobj, PyObject *slot_obj,
const QByteArray &slot_nm, const QByteArray &args)
{
// Ignore if it's not an autoconnect slot.
if (!slot_nm.startsWith("on_"))
return;
// Extract the names of the emitting object and the signal.
int i;
i = slot_nm.lastIndexOf('_');
if (i - 3 < 1 || i + 1 >= slot_nm.size())
return;
QByteArray ename = slot_nm.mid(3, i - 3);
QByteArray sname = slot_nm.mid(i + 1);
// Find the emitting object and get its meta-object.
QObject *eobj = qobj->findChild<QObject *>(ename);
if (!eobj)
return;
const QMetaObject *mo = eobj->metaObject();
// Got through the methods looking for a matching signal.
for (int m = 0; m < mo->methodCount(); ++m)
{
QMetaMethod mm = mo->method(m);
if (mm.methodType() != QMetaMethod::Signal)
continue;
QByteArray sig(mm.methodSignature());
if (Chimera::Signature::name(sig) != sname)
continue;
// If we have slot arguments then they must match as well.
if (!args.isEmpty() && Chimera::Signature::arguments(sig) != args)
continue;
QObject *receiver;
QByteArray slot_sig;
if (pyqt5_get_connection_parts(slot_obj, eobj, sig.constData(), false, &receiver, slot_sig) != sipErrorNone)
continue;
// Add the type character.
sig.prepend('2');
// Connect the signal.
QObject::connect(eobj, sig.constData(), receiver, slot_sig.constData());
}
}
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