qt-everywhere-src-5.14.1/qtbase/src/corelib/doc/snippets/code/doc_src_properties.cpp

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//! [0]
Q_PROPERTY(type name
           (READ getFunction [WRITE setFunction] |
            MEMBER memberName [(READ getFunction | WRITE setFunction)])
           [RESET resetFunction]
           [NOTIFY notifySignal]
           [REVISION int]
           [DESIGNABLE bool]
           [SCRIPTABLE bool]
           [STORED bool]
           [USER bool]
           [CONSTANT]
           [FINAL])
//! [0]


//! [1]
Q_PROPERTY(bool focus READ hasFocus)
Q_PROPERTY(bool enabled READ isEnabled WRITE setEnabled)
Q_PROPERTY(QCursor cursor READ cursor WRITE setCursor RESET unsetCursor)
//! [1]


//! [2]
Q_PROPERTY(QDate date READ getDate WRITE setDate)
//! [2]


//! [3]
QPushButton *button = new QPushButton;
QObject *object = button;

button->setDown(true);
object->setProperty("down", true);
//! [3]


//! [4]
QObject *object = ...
const QMetaObject *metaobject = object->metaObject();
int count = metaobject->propertyCount();
for (int i=0; i<count; ++i) {
    QMetaProperty metaproperty = metaobject->property(i);
    const char *name = metaproperty.name();
    QVariant value = object->property(name);
    ...
}
//! [4]


//! [5]
class MyClass : public QObject
{
    Q_OBJECT
    Q_PROPERTY(Priority priority READ priority WRITE setPriority NOTIFY priorityChanged)

public:
    MyClass(QObject *parent = 0);
    ~MyClass();

    enum Priority { High, Low, VeryHigh, VeryLow };
    Q_ENUM(Priority)

    void setPriority(Priority priority)
    {
        m_priority = priority;
        emit priorityChanged(priority);
    }
    Priority priority() const
    { return m_priority; }

signals:
    void priorityChanged(Priority);

private:
    Priority m_priority;
};
//! [5]


//! [6]
MyClass *myinstance = new MyClass;
QObject *object = myinstance;

myinstance->setPriority(MyClass::VeryHigh);
object->setProperty("priority", "VeryHigh");
//! [6]


//! [7]
Q_CLASSINFO("Version", "3.0.0")
//! [7]

//! [8]
    Q_PROPERTY(QColor color MEMBER m_color NOTIFY colorChanged)
    Q_PROPERTY(qreal spacing MEMBER m_spacing NOTIFY spacingChanged)
    Q_PROPERTY(QString text MEMBER m_text NOTIFY textChanged)
    ...
signals:
    void colorChanged();
    void spacingChanged();
    void textChanged(const QString &newText);

private:
    QColor  m_color;
    qreal   m_spacing;
    QString m_text;
//! [8]