QML之使用C++自定义QML类型(一）

   我们可以将C++定义的类型的类型注册到QML，在QML中使用这个类型。首先看看几个关键的东东

   int qmlRegisterType ( const char * uri, int versionMajor, int versionMinor, const char * qmlName )
   上面这个模板函数就是用来向QML注册C++类型。

   下面一个例子就是向QML注册Person类型。

   person.h--------------------------------------#ifndef PERSON_H#define PERSON_H#include <QObject>class Person : public QObject{ Q_OBJECT Q_PROPERTY(QString name READ name WRITE setName) Q_PROPERTY(int shoeSize READ shoeSize WRITE setShoeSize)public: Person(QObject *parent = 0); QString name() const; void setName(const QString &); int shoeSize() const; void setShoeSize(int);private: QString m_name; int m_shoeSize;};#endif // PERSON_Hperson.cpp---------------------------------------------------#include "person.h"Person::Person(QObject *parent) : QObject(parent), m_shoeSize(0){}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;}main.cpp----------------------------------------------------#include <QtGui/QApplication>#include <QtDeclarative/QDeclarativeEngine>#include <QtDeclarative/QDeclarativeComponent>#include <QDebug>#include "person.h"int main(int argc, char *argv[]){ QApplication a(argc, argv); qmlRegisterType<Person>("People", 1, 0, "Person"); QDeclarativeEngine engine; QDeclarativeComponent component(&engine, QUrl("qrc:/example.qml")); Person *person = qobject_cast<Person *>(component.create()); if(person) { qWarning() << "The person's name is" << person->name(); qWarning() << "They wear a" << person->shoeSize() << "sized shoe"; } else { qWarning() << component.errors(); } return a.exec();}example.qml---------------------------------------------------import People 1.0Person { name: "Lavy Liu" shoeSize: 12}输出:The person's name is "Lavy Liu" They wear a 12 sized shoe