qt-creator/src/libs/qmleditorwidgets/huecontrol.h

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** Copyright (C) 2016 The Qt Company Ltd.
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#pragma once

#include "qmleditorwidgets_global.h"
#include <QWidget>

namespace QmlEditorWidgets {

class QMLEDITORWIDGETS_EXPORT HueControl : public QWidget
{
    Q_OBJECT
    Q_PROPERTY(qreal hue READ hue WRITE setHue NOTIFY hueChanged)

public:
    HueControl(QWidget *parent = 0) : QWidget(parent), m_color(Qt::white), m_mousePressed(false)
    {
        setFixedWidth(28);
        setFixedHeight(130);
    }

    void setHue(int newHue);
    int hue() const { return m_color.hsvHue(); }

signals:
    void hueChanged(int hue);

protected:
    void paintEvent(QPaintEvent *);
    void mousePressEvent(QMouseEvent *);
    void mouseReleaseEvent(QMouseEvent *);
    void mouseMoveEvent(QMouseEvent *);
    void setCurrent(int y);

private:
    QColor m_color;
    bool m_mousePressed;
    QPixmap m_cache;
};

} //QmlEditorWidgets