monitor/include/canvas.h

#include <QWidget>

class Canvas : public QWidget
{
    Q_OBJECT

public:
    explicit Canvas( QWidget *parent = nullptr);
    ~Canvas();

    const QColor &backgroundColor() const;
    void setBackgroundColor(const QColor &newBackgroundColor);

protected:
    void paintEvent(QPaintEvent *event) override;

private:
    QColor m_backgroundColor;

};