Chapter 2: Connecting to C++ Methods and Signals

Qt slot  或者 using Q_INVOKABLE 都可以被qml调用

 

 public:

     ...

     Q_INVOKABLE void clearChart();



 signals:

     void chartCleared();

 

qml中对应onChartCleared

 

Chapter 3: Adding Property Bindings

allows values of different elements to be synchronized automatically

让不同元素的值自动同步

The "color: chartA.color" statement binds the color value of chartB to the color of chartA

 class PieChart : public QDeclarativeItem

 {

     ...

     Q_PROPERTY(QColor color READ color WRITE setColor NOTIFY colorChanged)

 public:

     ...

 signals:

     void colorChanged();

     ...

 };