LightWidget.h

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#ifndef _LIGHT_WIDGET_H_
#define _LIGHT_WIDGET_H_
 
 
#include <QWidget>
#include <QPainter>
 
 
 
class LightWidget : public QWidget
{
    Q_OBJECT
    Q_PROPERTY(bool on READ isOn WRITE setOn)
public:
    LightWidget(const QColor &color, QWidget *parent = 0)
        : QWidget(parent), m_colorOff(Qt::red),m_colorOn(Qt::green),
         m_on(false) {}
 
    bool isOn() const
        { return m_on; }
    void setOn(bool on)
    {
        if (on == m_on)
            return;
        m_on = on;
        update();
    }
 
public slots:
    void turnOff() { setOn(false); }
    void turnOn() { setOn(true); }
 
protected:
    void paintEvent(QPaintEvent *) override
    {
        if (!m_on)
        {
        QPainter painter(this);
        painter.setRenderHint(QPainter::Antialiasing);
        painter.setBrush(m_colorOff);
        painter.drawEllipse(0, 0, width(), height());
 
          return;
        }
        QPainter painter(this);
        painter.setRenderHint(QPainter::Antialiasing);
        painter.setBrush(m_colorOn);
        painter.drawEllipse(0, 0, width(), height());
    }
 
private:
    QColor m_colorOff;
    QColor m_colorOn;
    bool m_on;
};
 
#endif