Chapter 1: Creating a New Type

http://doc.qt.nokia.com/4.7-snapshot/declarative-tutorials-extending-chapter1-basics.html

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笔记：

QML 各个Element对应的c++类（http://doc.qt.nokia.com/4.7-snapshot/qdeclarativeelements.html）：

Item instantiates the C++ class QDeclarativeItem

Component instantiates the C++ class QDeclarativeComponent

QtObject instantiates the C++ class QObject

要点：

PieChart::PieChart(QDeclarativeItem *parent) :

    QDeclarativeItem(parent)

{

    // need to disable this flag to draw inside a QDeclarativeItem

    setFlag(QGraphicsItem::ItemHasNoContents, false);

}

qmlRegisterType<PieChart>("com.mycompany.Charts", 1, 0, "PieChart");

import com.mycompany.Charts 1.0