QML之使用C++自定义QML类型(一）

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本文介绍如何通过qmlRegisterType将C++定义的Person类型注册到QML中，并在QML内使用该类型。示例包括person.h、person.cpp和main.cpp文件，以及example.qml文件的具体实现。

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_H person.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 1.0 Person { name: "Lavy Liu" shoeSize: 12 } 输出: The person's name is "Lavy Liu" They wear a 12 sized shoe