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// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#ifndef DYNAMICMETA_H
#define DYNAMICMETA_H
#include <private/qobject_p.h>
#include <private/qmetaobjectbuilder_p.h>
#include <QtQmlIntegration/qqmlintegration.h>
template<typename T>
class MetaObjectData : public QDynamicMetaObjectData
{
Q_DISABLE_COPY_MOVE(MetaObjectData)
public:
MetaObjectData()
{
QMetaObjectBuilder builder;
builder.setSuperClass(&T::staticMetaObject);
builder.setFlags(builder.flags() | DynamicMetaObject);
metaObject = builder.toMetaObject();
};
~MetaObjectData() {
free(metaObject);
};
#if QT_VERSION >= QT_VERSION_CHECK(7, 0, 0)
const QMetaObject *toDynamicMetaObject(QObject *) const override
#else
QMetaObject *toDynamicMetaObject(QObject *) override
#endif
{
return metaObject;
}
int metaCall(QObject *o, QMetaObject::Call call, int idx, void **argv) override
{
return o->qt_metacall(call, idx, argv);
}
QMetaObject *metaObject = nullptr;
};
class DynamicMeta : public QObject
{
Q_OBJECT
Q_PROPERTY(int foo READ foo WRITE setFoo NOTIFY fooChanged FINAL)
Q_PROPERTY(qreal value READ value WRITE setValue RESET resetValue NOTIFY valueChanged FINAL)
Q_PROPERTY(qreal shadowable READ shadowable CONSTANT)
QML_ELEMENT
public:
DynamicMeta(QObject *parent = nullptr)
: QObject(parent)
{
// deletes itself
QObjectPrivate::get(this)->metaObject = new MetaObjectData<DynamicMeta>;
}
int foo() const { return m_foo; }
void setFoo(int newFoo)
{
if (m_foo != newFoo) {
m_foo = newFoo;
emit fooChanged();
}
}
Q_INVOKABLE int bar(int baz) { return baz + 12; }
qreal value() const { return m_value; }
qreal shadowable() const { return 25; }
public slots:
void resetValue() { setValue(0); }
void setValue(qreal value)
{
if (m_value == value)
return;
m_value = value;
emit valueChanged();
}
Q_SIGNALS:
void fooChanged();
void valueChanged();
private:
int m_foo = 0;
qreal m_value = 0;
};
class DynamicMetaSingleton : public DynamicMeta
{
Q_OBJECT
QML_ELEMENT
QML_SINGLETON
Q_PROPERTY(DynamicMetaSingleton *itself READ itself CONSTANT FINAL)
public:
DynamicMetaSingleton(QObject *parent = nullptr) : DynamicMeta(parent)
{
QObjectPrivate *d = QObjectPrivate::get(this);
delete d->metaObject;
d->metaObject = new MetaObjectData<DynamicMetaSingleton>;
}
DynamicMetaSingleton *itself() { return this; }
};
#endif // DYNAMICMETA_H
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