qgsrangeslider.h

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/***************************************************************************
    qgsrangeslider.h
    ---------------------
    begin                : November 2020
    copyright            : (C) 2020 by Nyall Dawson
    email                : nyall dot dawson at gmail dot com
 ***************************************************************************
 *                                                                         *
 *   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; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
 
#ifndef QGSRANGESLIDER_H
#define QGSRANGESLIDER_H
 
#include "qgis_gui.h"
#include "qgis_sip.h"
 
#include <QStyleOptionSlider>
#include <QWidget>

class GUI_EXPORT QgsRangeSlider : public QWidget
{
    Q_OBJECT
 
  public:
    QgsRangeSlider( QWidget *parent SIP_TRANSFERTHIS = nullptr );

    QgsRangeSlider( Qt::Orientation orientation, QWidget *parent SIP_TRANSFERTHIS = nullptr );

    int minimum() const;

    int maximum() const;

    int lowerValue() const;

    int upperValue() const;

    void setTickPosition( QSlider::TickPosition position );

    QSlider::TickPosition tickPosition() const;

    void setTickInterval( int interval );

    int tickInterval() const;

    void setOrientation( Qt::Orientation orientation );

    Qt::Orientation orientation() const;

    bool flippedDirection() const;

    void setFlippedDirection( bool flipped );
 
    void paintEvent( QPaintEvent *event ) override;
    void mousePressEvent( QMouseEvent *event ) override;
    void mouseMoveEvent( QMouseEvent *event ) override;
    void mouseReleaseEvent( QMouseEvent *event ) override;
    void keyPressEvent( QKeyEvent *event ) override;
    QSize sizeHint() const override;
    QSize minimumSizeHint() const override;

    int singleStep() const;

    int pageStep() const;

    int fixedRangeSize() const;

    void setFixedRangeSize( int size );
 
  public slots:

    void setMaximum( int maximum );

    void setMinimum( int minimum );

    void setRangeLimits( int minimum, int maximum );

    void setLowerValue( int value );

    void setUpperValue( int value );

    void setRange( int lower, int upper );

    void setSingleStep( int step );

    void setPageStep( int step );
 
    bool event( QEvent *event ) override;
 
  signals:

    void rangeChanged( int minimum, int maximum );

    void rangeLimitsChanged( int minimum, int maximum );

    void fixedRangeSizeChanged( int size );
 
  private:
    int pick( const QPoint &pt ) const;
    int pixelPosToRangeValue( int pos ) const;
    bool updateHoverControl( const QPoint &pos );
    bool newHoverControl( const QPoint &pos );
    QRect selectedRangeRect();
    void drawFocusRect();
 
    int mLowerValue = 0;
    int mUpperValue = 0;
 
    int mSingleStep = 1;
    int mPageStep = 10;
 
    int mFixedRangeSize = -1;
 
    QStyleOptionSlider mStyleOption;
    enum Control
    {
      None,
      Lower,
      Upper,
      Both,
      Range
    };
 
    void applyStep( int step );
    int unFlippedSliderPosition( int value ) const;
 
    Control mActiveControl = None;
    int mStartDragPos = -1;
    int mLowerClickOffset = 0;
    int mUpperClickOffset = 0;
    int mRangeDragOffset = 0;
    int mPreDragLowerValue = -1;
    int mPreDragUpperValue = -1;
    Control mHoverControl = None;
    Control mFocusControl = Lower;
    QStyle::SubControl mHoverSubControl = QStyle::SC_None;
    QRect mHoverRect;
 
    bool mFlipped = false;
};
 
#endif // QGSRANGESLIDER_H