iDescriptor/src/qprocessindicator.h

// https://github.com/raythorn/QProcessIndicator/blob/master/QProcessIndicator/QProcessIndicator.h
#ifndef QPROCESSINDICATOR_H
#define QPROCESSINDICATOR_H

#include <QColor>
#include <QPaintEvent>
#include <QPainter>
#include <QTimer>
#include <QWidget>

class QProcessIndicator : public QWidget
{
    Q_OBJECT

    Q_PROPERTY(int m_type READ type WRITE setType)
    Q_PROPERTY(QColor m_color READ color WRITE setColor)
    Q_PROPERTY(int m_interval READ interval WRITE setInterval)

public:
    QProcessIndicator(QWidget *parent = 0);
    ~QProcessIndicator();

    enum {
        line_rotate,
        line_scale,
        ball_rotate,
    };

    void paintEvent(QPaintEvent *e);

    void start();
    void stop();

    int type() { return m_type; }
    void setType(int type) { m_type = type; }

    QColor &color() { return m_color; }
    void setColor(QColor &color) { m_color = color; }

    int interval() { return m_interval; }
    void setInterval(int interval) { m_interval = interval; }

private slots:
    void onTimeout();

private:
    void drawRotateLine(QPainter *painter);
    void drawScaleLine(QPainter *painter);
    void drawRotateBall(QPainter *painter);

private:
    int m_type;
    int m_interval;
    QColor m_color;

    int m_angle;
    qreal m_scale;

    QTimer *m_timer;
};

#endif // QPROCESSINDICATOR_H