Extending QML - Default Property Example▲
This example builds on:
The Default Property Example is a minor modification of the Extending QML - Inheritance and Coercion Example that simplifies the specification of a BirthdayParty through the use of a default property.
BirthdayParty {
host: Boy {
name: "Bob Jones"
shoeSize: 12
}
Boy { name: "Leo Hodges" }
Boy { name: "Jack Smith" }
Girl { name: "Anne Brown" }
}Declaring the BirthdayParty Class▲
The only difference between this example and the last, is the addition of the DefaultProperty class info annotation.
class BirthdayParty : public QObject
{
Q_OBJECT
Q_PROPERTY(Person *host READ host WRITE setHost)
Q_PROPERTY(QQmlListProperty<Person> guests READ guests)
Q_CLASSINFO("DefaultProperty", "guests")
public:
BirthdayParty(QObject *parent = 0);
Person *host() const;
void setHost(Person *);
QQmlListProperty<Person> guests();
int guestCount() const;
Person *guest(int) const;
private:
Person *m_host;
QList<Person *> m_guests;
};The default property specifies the property to assign to whenever an explicit property is not specified, in the case of the BirthdayParty type the guest property. It is purely a syntactic simplification, the behavior is identical to specifying the property by name, but it can add a more natural feel in many situations. The default property must be either an object or list property.
Running the Example▲
The main.cpp file in the example includes a simple shell application that loads and runs the QML snippet shown at the beginning of this page.