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// This implements the helper for QObject.__getattr__().
//
// 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 <QHash>
#include <QMetaMethod>
#include <QObject>
#include "qpycore_api.h"
#include "qpycore_pyqtboundsignal.h"
#include "qpycore_pyqtmethodproxy.h"
#include "qpycore_pyqtsignal.h"
// See if we can find an attribute in the Qt meta-type system. This is
// primarily to support access to JavaScript (e.g. QQuickItem) so we don't
// support overloads.
PyObject *qpycore_qobject_getattr(const QObject *qobj, PyObject *py_qobj,
const char *name)
{
const QMetaObject *mo = qobj->metaObject();
// Try and find a method with the name.
QMetaMethod method;
int method_index = -1;
// Count down to allow overrides (assuming they are possible).
for (int m = mo->methodCount() - 1; m >= 0; --m)
{
method = mo->method(m);
if (method.methodType() == QMetaMethod::Constructor)
continue;
// Get the method name.
QByteArray mname(method.methodSignature());
int idx = mname.indexOf('(');
if (idx >= 0)
mname.truncate(idx);
if (mname == name)
{
method_index = m;
break;
}
}
if (method_index >= 0)
{
// Get the value to return. Note that this is recreated each time. We
// could put a descriptor in the type dictionary to satisfy the request
// in future but the typical use case is getting a value from a C++
// proxy (e.g. QDeclarativeItem) and we can't assume that what is being
// proxied is the same each time.
if (method.methodType() == QMetaMethod::Signal)
{
// We need to keep explicit references to the unbound signals
// (because we don't use the type dictionary to do so) because they
// own the parsed signature which may be needed by a PyQtSlotProxy
// at some point.
typedef QHash<QByteArray, PyObject *> SignalHash;
static SignalHash *sig_hash = 0;
// For crappy compilers.
if (!sig_hash)
sig_hash = new SignalHash;
PyObject *sig_obj;
QByteArray sig_str = method.methodSignature();
SignalHash::const_iterator it = sig_hash->find(sig_str);
if (it == sig_hash->end())
{
sig_obj = (PyObject *)qpycore_pyqtSignal_New(
sig_str.constData());
if (!sig_obj)
return 0;
sig_hash->insert(sig_str, sig_obj);
}
else
{
sig_obj = it.value();
}
return qpycore_pyqtBoundSignal_New((qpycore_pyqtSignal *)sig_obj,
py_qobj, const_cast<QObject *>(qobj));
}
// Respect the 'private' nature of __ names.
if (name[0] != '_' || name[1] != '_')
{
QByteArray py_name(sipPyTypeName(Py_TYPE(py_qobj)));
py_name.append('.');
py_name.append(name);
return qpycore_pyqtMethodProxy_New(const_cast<QObject *>(qobj),
method_index, py_name);
}
}
// Replicate the standard Python exception.
PyErr_Format(PyExc_AttributeError, "'%s' object has no attribute '%s'",
sipPyTypeName(Py_TYPE(py_qobj)), name);
return 0;
}
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