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// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "pysideqmlattached.h"
#include "pysideqmlattached_p.h"
#include "pysideqmltypeinfo_p.h"
#include "pysideqmlregistertype_p.h"
#include <signalmanager.h>
#include <pyside_p.h>
#include <pysideclassdecorator_p.h>
#include <shiboken.h>
#include <signature.h>
#include <sbkstring.h>
#include <QtCore/QtGlobal>
#include <QtQml/qqml.h>
#include <algorithm>
// The QmlAttached decorator modifies QmlElement to register an attached property
// type. Due to the (reverse) execution order of decorators, it needs to follow
// QmlElement.
class PySideQmlAttachedPrivate : public PySide::ClassDecorator::TypeDecoratorPrivate
{
public:
PyObject *tp_call(PyObject *self, PyObject *args, PyObject * /* kw */) override;
const char *name() const override;
};
// The call operator is passed the class type and registers the type
// in QmlTypeInfo.
PyObject *PySideQmlAttachedPrivate::tp_call(PyObject *self, PyObject *args, PyObject * /* kw */)
{
PyObject *klass = tp_call_check(args, CheckMode::WrappedType);
if (klass == nullptr)
return nullptr;
auto *data = DecoratorPrivate::get<PySideQmlAttachedPrivate>(self);
PySide::Qml::ensureQmlTypeInfo(klass)->attachedType = data->type();
Py_INCREF(klass);
return klass;
}
const char *PySideQmlAttachedPrivate::name() const
{
return "QmlAttached";
}
extern "C" {
static PyTypeObject *createPySideQmlAttachedType(void)
{
auto typeSlots =
PySide::ClassDecorator::Methods<PySideQmlAttachedPrivate>::typeSlots();
PyType_Spec PySideQmlAttachedType_spec = {
"2:PySide6.QtCore.qmlAttached",
sizeof(PySideClassDecorator),
0,
Py_TPFLAGS_DEFAULT,
typeSlots.data()
};
return SbkType_FromSpec(&PySideQmlAttachedType_spec);
}
PyTypeObject *PySideQmlAttached_TypeF(void)
{
static auto *type = createPySideQmlAttachedType();
return type;
}
} // extern "C"
static const char *qmlAttached_SignatureStrings[] = {
"PySide6.QtQml.QmlAttached(self,type:type)",
nullptr // Sentinel
};
namespace PySide::Qml {
static QObject *attachedFactoryHelper(PyTypeObject *attachingType, QObject *o)
{
// Call static qmlAttachedProperties() on type. If there is an error
// and nullptr is returned, a crash occurs. So, errors should at least be
// printed.
Shiboken::GilState gilState;
Shiboken::Conversions::SpecificConverter converter("QObject");
Q_ASSERT(converter);
static const char methodName[] = "qmlAttachedProperties";
static PyObject *const pyMethodName = Shiboken::String::createStaticString(methodName);
PyObject *attachingTypeObj = reinterpret_cast<PyObject *>(attachingType);
Shiboken::AutoDecRef pyResult(PyObject_CallMethodObjArgs(attachingTypeObj, pyMethodName,
attachingTypeObj /* self */,
converter.toPython(&o),
nullptr));
if (pyResult.isNull() || PyErr_Occurred()) {
PyErr_Print();
return nullptr;
}
if (PyType_IsSubtype(pyResult->ob_type, qObjectType()) == 0) {
qWarning("QmlAttached: Attached objects must inherit QObject, got %s.",
pyResult->ob_type->tp_name);
return nullptr;
}
QObject *result = nullptr;
converter.toCpp(pyResult.object(), &result);
return result;
}
// Since the required attached factory signature does not have a void *user
// parameter to store the attaching type, we employ a template trick, storing
// the attaching types in an array and create non-type-template (int) functions
// taking the array index as template parameter.
// We initialize the attachedFactories array with factory functions
// accessing the attachingTypes[N] using template metaprogramming.
enum { MAX_ATTACHING_TYPES = 50};
using AttachedFactory = QObject *(*)(QObject *);
static int nextAttachingType = 0;
static PyTypeObject *attachingTypes[MAX_ATTACHING_TYPES];
static AttachedFactory attachedFactories[MAX_ATTACHING_TYPES];
template <int N>
static QObject *attachedFactory(QObject *o)
{
return attachedFactoryHelper(attachingTypes[N], o);
}
template<int N>
struct AttachedFactoryInitializerBase
{
};
template<int N>
struct AttachedFactoryInitializer : AttachedFactoryInitializerBase<N>
{
static void init()
{
attachedFactories[N] = attachedFactory<N>;
AttachedFactoryInitializer<N-1>::init();
}
};
template<>
struct AttachedFactoryInitializer<0> : AttachedFactoryInitializerBase<0>
{
static void init()
{
attachedFactories[0] = attachedFactory<0>;
}
};
void initQmlAttached(PyObject *module)
{
std::fill(attachingTypes, attachingTypes + MAX_ATTACHING_TYPES, nullptr);
AttachedFactoryInitializer<MAX_ATTACHING_TYPES - 1>::init();
if (InitSignatureStrings(PySideQmlAttached_TypeF(), qmlAttached_SignatureStrings) < 0)
return;
Py_INCREF(PySideQmlAttached_TypeF());
PyModule_AddObject(module, "QmlAttached",
reinterpret_cast<PyObject *>(PySideQmlAttached_TypeF()));
}
PySide::Qml::QmlExtensionInfo qmlAttachedInfo(PyTypeObject *t,
const QSharedPointer<QmlTypeInfo> &info)
{
PySide::Qml::QmlExtensionInfo result{nullptr, nullptr};
if (info.isNull() || info->attachedType == nullptr)
return result;
auto *name = reinterpret_cast<PyTypeObject *>(t)->tp_name;
if (nextAttachingType >= MAX_ATTACHING_TYPES) {
qWarning("Unable to initialize attached type \"%s\": "
"The limit %d of attached types has been reached.",
name, MAX_ATTACHING_TYPES);
return result;
}
result.metaObject = PySide::retrieveMetaObject(info->attachedType);
if (result.metaObject == nullptr) {
qWarning("Unable to retrieve meta object for %s", name);
return result;
}
attachingTypes[nextAttachingType] = t;
result.factory = attachedFactories[nextAttachingType];
++nextAttachingType;
return result;
}
QObject *qmlAttachedPropertiesObject(PyObject *typeObject, QObject *obj, bool create)
{
auto *type = reinterpret_cast<PyTypeObject *>(typeObject);
auto *end = attachingTypes + nextAttachingType;
auto *typePtr = std::find(attachingTypes, end, type);
if (typePtr == end) {
qWarning("%s: Attaching type \"%s\" not found.", __FUNCTION__, type->tp_name);
return nullptr;
}
auto func = attachedFactories[std::uintptr_t(typePtr - attachingTypes)];
return ::qmlAttachedPropertiesObject(obj, func, create);
}
} // namespace PySide::Qml
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