Extending QML - Adding Types Example▲
The Adding Types Example shows how to add a new object type, Person, to QML. The Person type can be used from QML like this:
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import People
Person {
name: "Bob Jones"
shoeSize: 12
}Declare the Person Class▲
All QML types map to C++ types. Here we declare a basic C++ Person class with the two properties we want accessible on the QML type - name and shoeSize. Although in this example we use the same name for the C++ class as the QML type, the C++ class can be named differently, or appear in a namespace.
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class Person : public QObject
{
Q_OBJECT
Q_PROPERTY(QString name READ name WRITE setName)
Q_PROPERTY(int shoeSize READ shoeSize WRITE setShoeSize)
QML_ELEMENT
public:
using QObject::QObject;
QString name() const;
void setName(const QString &);
int shoeSize() const;
void setShoeSize(int);
private:
QString m_name;
int m_shoeSize = 0;
};Define the Person Class▲
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QString Person::name() const
{
return m_name;
}
void Person::setName(const QString &n)
{
m_name = n;
}
int Person::shoeSize() const
{
return m_shoeSize;
}
void Person::setShoeSize(int s)
{
m_shoeSize = s;
}The Person class implementation is quite basic. The property accessors simply return members of the object instance.
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.