RangeSlider.H

// ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//
// JeVois Smart Embedded Machine Vision Toolkit - Copyright (C) 2018 by Laurent Itti, the University of Southern
// California (USC), and iLab at USC. See http://iLab.usc.edu and http://jevois.org for information about this project.
//
// This file is part of the JeVois Smart Embedded Machine Vision Toolkit.  This program is free software; you can
// redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software
// Foundation, version 2.  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
// without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
// License for more details.  You should have received a copy of the GNU General Public License along with this program;
// if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// Contact information: Laurent Itti - 3641 Watt Way, HNB-07A - Los Angeles, CA 90089-2520 - USA.
// Tel: +1 213 740 3527 - itti@pollux.usc.edu - http://iLab.usc.edu - http://jevois.org
// ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////



// This code from: https://github.com/ThisIsClark/Qt-RangeSlider

#pragma once

#include <QWidget>
#include <QPainter>
#include <QMouseEvent>

class RangeSlider : public QWidget
{
    Q_OBJECT

public:
    RangeSlider(QWidget* aParent = Q_NULLPTR);

    QSize minimumSizeHint() const override;

    int GetMinimun() const;
    void SetMinimum(int aMinimum);

    int GetMaximun() const;
    void SetMaximum(int aMaximum);

    int GetLowerValue() const;
    void SetLowerValue(int aLowerValue);

    int GetUpperValue() const;
    void SetUpperValue(int aUpperValue);

    void SetRange(int aMinimum, int aMaximum);

protected:
    void paintEvent(QPaintEvent* aEvent) override;
    void mousePressEvent(QMouseEvent* aEvent) override;
    void mouseMoveEvent(QMouseEvent* aEvent) override;
    void mouseReleaseEvent(QMouseEvent* aEvent) override;
    void changeEvent(QEvent* aEvent) override;

    QRectF firstHandleRect() const;
    QRectF secondHandleRect() const;
    QRectF handleRect(int aValue) const;

signals:
    void lowerValueChanged(int aLowerValue);
    void upperValueChanged(int aUpperValue);
    void rangeChanged(int aMin, int aMax);

public slots:
    void setLowerValue(int aLowerValue);
    void setUpperValue(int aUpperValue);
    void setMinimum(int aMinimum);
    void setMaximum(int aMaximum);

private:
    Q_DISABLE_COPY(RangeSlider)
    float currentPercentage();
    int validWidth() const;

    int mMinimum;
    int mMaximum;
    int mLowerValue;
    int mUpperValue;
    bool mFirstHandlePressed;
    bool mSecondHandlePressed;
    int mInterval;
    int mDelta;
    QColor mBackgroudColorEnabled;
    QColor mBackgroudColorDisabled;
    QColor mBackgroudColor;
};