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