Russian Qt Forum

C++ (Qt)
#include <QDeclarativeItem>
 
class ball : public QDeclarativeItem
{
    Q_OBJECT
 
    int first_ball_X;
 
    Q_PROPERTY(int first_ball_x READ get_first_ball_x WRITE set_first_ball_x
               NOTIFY first_ball_xChanged)
public:
    explicit ball(QDeclarativeItem *parent = 0);
    const int& get_first_ball_x() const;
 
    void set_first_ball_x(const int);
 
protected:
    void timerEvent(QTimerEvent *);
 
signals:
    void first_ball_xChanged(int first_ball_X_value);
};

C++ (Qt)
void ball::timerEvent(QTimerEvent *te)
{
    static int ready = 1;
    if (ready >= 100)
    {
        killTimer(te->timerId());
        qDebug() << "Stop ball rolling";
        emit readyDone();
    }
    else
    {
        ready++;
        first_ball_X = first_ball_X - (2 * shift_X / ready);
        int first_ball_X_value = first_ball_X;
        emit first_ball_xChanged(first_ball_X_value);
    }
}
 

Javascript
Ball
        {
            anchors.fill: parent
            id: ball_main
            MouseArea
            {
                anchors.fill: parent
                onClicked:
                {
                    ball_main.shift_x = mouseX - ball_1.x - ball_1.width/2  // center of ball on Ox
                    ball_main.shift_y = mouseY - ball_1.y - ball_1.height/2 // center of ball on Oy
                    onFirst_ball_xChanged: ball_1.x = first_ball_X_value;
 
                }
 
            }
        }

C++ (Qt)
 qmlRegisterType<ball>("balls", 1, 0, "Ball");

int first_ball_X_value = first_ball_X;
emit first_ball_xChanged(first_ball_X_value);

C++ (Qt)
emit first_ball_xChanged(first_ball_X);

Javascript
onFirst_ball_xChanged:
{
      ball_1.x = first_ball_X_value;
}