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/****************************************************************************
**
** Copyright (C) 2017 Pelagicore AG
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtIvi module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL-QTAS$
** Commercial License Usage
** Licensees holding valid commercial Qt Automotive Suite licenses may use
** this file in accordance with the commercial license agreement provided
** with the Software or, alternatively, in accordance with the terms
** contained in a written agreement between you and The Qt Company. For
** licensing terms and conditions see https://www.qt.io/terms-conditions.
** For further information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
** SPDX-License-Identifier: LGPL-3.0
**
****************************************************************************/
#ifndef QIVIPROPERTYFACTORY_H
#define QIVIPROPERTYFACTORY_H
#include <QtIviCore/qtiviglobal.h>
#include <QtIviCore/QIviProperty>
#include <QtIviCore/qivitypetraits.h>
#include <QtIviCore/qiviqmlconversion_helper.h>
#include <QMetaEnum>
QT_BEGIN_NAMESPACE
template <typename T>
class QIviPropertyFactory : public QIviProperty
{
public:
//readwrite property
template <typename attributeGetterFunc, typename attributeSignalFunc, typename valueGetterFunc, typename valueSignalFunc, typename valueSlotFunc>
static inline QIviPropertyFactory *create(const typename QtPrivate::FunctionPointer<attributeGetterFunc>::Object *sender, attributeGetterFunc attributeGetter, attributeSignalFunc attributeSignal, valueGetterFunc valueGetter, valueSignalFunc valueSignal, valueSlotFunc valueSlot)
{
typedef QtPrivate::FunctionPointer<valueSignalFunc> ValueSignalType;
typedef QtPrivate::FunctionPointer<valueSlotFunc> SlotType;
typedef QtPrivate::List<T, void> ValueType;
Q_STATIC_ASSERT_X(int(SlotType::ArgumentCount) == 1,
"The value slot needs to have exactly one argument");
Q_STATIC_ASSERT_X((QtPrivate::CheckCompatibleArguments<typename ValueSignalType::Arguments, typename SlotType::Arguments>::value),
"Value signal and value slot arguments are not compatible.");
Q_STATIC_ASSERT_X((QtPrivate::CheckCompatibleArguments<ValueType, typename SlotType::Arguments>::value),
"Property type and value slot arguments are not compatible.");
QIviPropertyFactory *prop = create(sender, attributeGetter, attributeSignal, valueGetter, valueSignal);
prop->setValueSetterHelper(new QtPrivate::QSlotObject<valueSlotFunc, typename SlotType::Arguments, void>(valueSlot));
return prop;
}
//readonly property (no write slot)
template <typename attributeGetterFunc, typename attributeSignalFunc, typename valueGetterFunc, typename valueSignalFunc>
static inline QIviPropertyFactory *create(const typename QtPrivate::FunctionPointer<attributeGetterFunc>::Object *sender, attributeGetterFunc attributeGetter, attributeSignalFunc attributeSignal, valueGetterFunc valueGetter, valueSignalFunc valueSignal)
{
typedef QtPrivate::FunctionPointer<attributeGetterFunc> AttributeGetterType;
typedef QtPrivate::FunctionPointer<attributeSignalFunc> AttributeSignalType;
typedef QtPrivate::FunctionPointer<valueGetterFunc> ValueGetterType;
typedef QtPrivate::FunctionPointer<valueSignalFunc> ValueSignalType;
Q_STATIC_ASSERT_X(int(AttributeGetterType::ArgumentCount) == 0,
"The attribute getter can't have any arguments' ");
Q_STATIC_ASSERT_X(int(ValueGetterType::ArgumentCount) == 0,
"The value getter can't have any arguments' ");
Q_STATIC_ASSERT_X(int(ValueSignalType::ArgumentCount) == 1,
"The value signal needs to have exactly one argument");
typedef QtPrivate::List<typename ValueGetterType::ReturnType, void> ValueGetterReturnType;
typedef QtPrivate::List<QIviPropertyAttribute<T>, void> AttributeType;
typedef QtPrivate::List<typename AttributeGetterType::ReturnType, void> AttributeGetterReturnType;
Q_STATIC_ASSERT_X((QtPrivate::CheckCompatibleArguments<ValueGetterReturnType, typename ValueSignalType::Arguments>::value),
"Value getter return type and value signal arguments are not compatible.");
Q_STATIC_ASSERT_X((QtPrivate::CheckCompatibleArguments<AttributeType, typename AttributeSignalType::Arguments>::value),
"Attribute type and attribute signal arguments are not compatible.");
Q_STATIC_ASSERT_X((QtPrivate::CheckCompatibleArguments<AttributeGetterReturnType, typename AttributeSignalType::Arguments>::value),
"Attribute getter return type and attribute signal arguments are not compatible.");
//Only Enums declared with Q_ENUM can be converted from an int without knowing the MetaObject where it is defined in
//We also can't check this at compile time, so we check this at runtime.
//We use a qFatal here to ensure that we die right when we are detecting this.
int userType = qMetaTypeId<T>();
QMetaType metaType(userType);
if (metaType.flags() & QMetaType::IsEnumeration) {
const QMetaObject *mo = metaType.metaObject();
if (Q_UNLIKELY(!mo))
//TODO Do we want to use a qFatal() here or just report a qCritical instead ?
qFatal("The provided enum needs to be declared as Q_ENUM or Q_FLAG");
}
QIviPropertyFactory *prop = new QIviPropertyFactory(userType, sender,
new QtPrivate::QSlotObject<attributeGetterFunc, typename AttributeGetterType::Arguments, typename AttributeGetterType::ReturnType>(attributeGetter),
new QtPrivate::QSlotObject<valueGetterFunc, typename ValueGetterType::Arguments, typename ValueGetterType::ReturnType>(valueGetter));
connect(sender, attributeSignal, prop, [prop](const QIviPropertyAttribute<T> &attribute) {prop->updateAttribute(attribute);});
connect(sender, valueSignal, prop, [prop](const T &value) {prop->valueChanged(QVariant::fromValue(value));});
return prop;
}
bool isAvailable() const Q_DECL_OVERRIDE
{
return callAttributeGetter().isAvailable();
}
QVariant minimumValue() const Q_DECL_OVERRIDE
{
return QVariant::fromValue<T>(callAttributeGetter().minimumValue());
}
QVariant maximumValue() const Q_DECL_OVERRIDE
{
return QVariant::fromValue<T>(callAttributeGetter().maximumValue());
}
QVariantList availableValues() const Q_DECL_OVERRIDE
{
return qtivi_convertAvailableValues(callAttributeGetter().availableValues());
}
QVariant value() const Q_DECL_OVERRIDE
{
T val;
void *args[] = { reinterpret_cast<void*>(&val), QVariant().data() };
valueGetter()->call(parent(), args);
return qtivi_convertValue(val);
}
private:
QIviPropertyFactory(int userType, const QObject *receiver, QtPrivate::QSlotObjectBase *attGetter, QtPrivate::QSlotObjectBase *valGetter)
: QIviProperty(userType, receiver, attGetter, valGetter)
{
registerConverters();
}
//We need to know the exact type here to allocate it before calling the getter.
//The call function will just use the operator=() function to assign it to our local instance,
//but will not create a new one.
QIviPropertyAttribute<T> callAttributeGetter() const {
QIviPropertyAttribute<T> attribute;
void *args[] = { reinterpret_cast<void*>(&attribute), QVariant().data() };
attributeGetter()->call(parent(), args);
return attribute;
}
void updateAttribute(const QIviPropertyAttribute<T> &attribute)
{
Q_EMIT availableChanged(attribute.isAvailable());
Q_EMIT minimumValueChanged(QVariant::fromValue<T>(attribute.minimumValue()));
Q_EMIT maximumValueChanged(QVariant::fromValue<T>(attribute.maximumValue()));
Q_EMIT availableValuesChanged(qtivi_convertAvailableValues(attribute.availableValues()));
}
//Just needed as we can't call the protected function directly in the create() functions
void setValueSetterHelper(QtPrivate::QSlotObjectBase *valueSetter)
{
setValueSetter(valueSetter);
}
//If T is NOT convertible into a int e.g. QFlag
template <typename F=T> Q_INLINE_TEMPLATE typename QtPrivate::QEnableIf<!QtPrivate::is_flag<F>::value, void>::Type registerConverters()
{
}
//If T is convertible into a int e.g. QFlag
template <typename F=T> Q_INLINE_TEMPLATE typename QtPrivate::QEnableIf<QtPrivate::is_flag<F>::value, void>::Type registerConverters()
{
if (!QMetaType::hasRegisteredConverterFunction<F, int>())
QMetaType::registerConverter<F, int>(&F::operator int);
}
friend struct PropertyTestData;
};
QT_END_NAMESPACE
#endif // QIVIPROPERTYFACTORY_H
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