diff -r 409d9c7214be -r fb0bb9a2a7e1 src/RangedSlider.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/RangedSlider.h	Wed Mar 30 15:31:57 2022 +0200
@@ -0,0 +1,172 @@
+/*
+ * RangedSlider.h is part bmsapp.
+ *
+ * Original written for Brewtarget, and is Copyright the following
+ * authors 2009-2020
+ * - Matt Young <mfsy@yahoo.com>
+ * - Mik Firestone <mikfire@gmail.com>
+ * - Philip G. Lee <rocketman768@gmail.com>
+ *
+ * bmsapp 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * bmsapp 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, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef RANGEDSLIDER_H
+#define RANGEDSLIDER_H
+
+#include <QWidget>
+#include <QSize>
+#include <QString>
+#include <QBrush>
+#include <QPen>
+class QPaintEvent;
+class QMouseEvent;
+
+/**
+ * @brief Widget to display a number with an optional range on a type of read-only slider.
+ * @author Philip G. Lee
+ */
+class RangedSlider : public QWidget
+{
+   Q_OBJECT
+
+public:
+   RangedSlider(QWidget* parent=0);
+
+   Q_PROPERTY( double value READ value WRITE setValue )
+
+   double value() const { return _val; }
+
+   //! \brief Set the background brush for the widget.
+   void setBackgroundBrush( QBrush const& brush );
+   //! \brief Set the brush for the preffered range.
+   void setPreferredRangeBrush( QBrush const& brush );
+   //! \brief Set the pen for the preferred range
+   void setPreferredRangePen( QPen const& pen );
+   //! \brief Set the brush for the marker.
+   void setMarkerBrush( QBrush const& brush );
+   //! \brief Set the text displayed above the marker.
+   void setMarkerText( QString const& text );
+   //! \brief If true, the marker text will always be updated to the value given by \c setValue().
+   void setMarkerTextIsValue(bool val);
+
+   /*!
+    * \brief Set the tick mark intervals.
+    *
+    * If either parameter is <= 0, then the tick marks are not drawn.
+    *
+    * \param primaryInterval How often to draw big tick marks.
+    * \param secondaryTicks Number of secondary ticks per primary tick.
+    */
+   void setTickMarks( double primaryInterval, int secondaryTicks = 1 );
+
+   //! \brief Set the \c precision for displaying values.
+   void setPrecision(int precision);
+
+   //! \brief Reimplemented from QWidget.
+   virtual QSize sizeHint() const;
+
+public slots:
+
+   //! \brief Set the \c value for the indicator.
+   void setValue(double value);
+
+   /*!
+    * \brief Set the range of values considered to be *best*
+    *
+    * \param range \c range.first and \c range.second are the min and max
+    *        values for the preferred range resp.
+    */
+   void setPreferredRange(QPair<double,double> range);
+
+   /*!
+    * \brief Set the range of values that the widget displays
+    *
+    * \param range \c range.first and \c range.second are the min and max
+    *        values for the preferred range resp.
+    */
+   void setRange(QPair<double,double> range);
+
+   //! \brief Convenience method for setting the widget range
+   void setRange( double min, double max );
+
+   //! \brief Convenience method for setting the preferred range
+   //         Note that this is completely unrelated to "preferred size".
+   void setPreferredRange( double min, double max );
+
+protected:
+   //! \brief Reimplemented from QWidget.
+   virtual void paintEvent(QPaintEvent* event);
+   //! \brief Reimplemented from QWidget for popup on mouseover.
+   virtual void mouseMoveEvent(QMouseEvent* event);
+   //! \brief Reimplemented from QWidget.
+   virtual void moveEvent(QMoveEvent *event);
+
+private:
+   /**
+    * Sets minimum / maximum sizes and resize policy
+    */
+   void setSizes();
+   void recalculateHeightInPixels() const;
+
+   /**
+    * Minimum value the widget displays
+    */
+   double _min;
+   /**
+    * Maximum value the widget displays
+    */
+   double _max;
+
+   /**
+    * Minimum value for the "best" sub-range
+    */
+   double _prefMin;
+   /**
+    * Maximum value for the "best" sub-range
+    */
+   double _prefMax;
+   double _val;
+   QString _valText;
+   QString _markerText;
+   int _prec;
+   double _tickInterval;
+   int _secondaryTicks;
+   QString _tooltipText;
+   QBrush _bgBrush;
+   QBrush _prefRangeBrush;
+   QPen _prefRangePen;
+   QBrush _markerBrush;
+   bool _markerTextIsValue;
+
+   /**
+    * The font used for showing the value at the right-hand side of the slider
+    */
+   QFont const valueTextFont;
+
+   /**
+    * The font used for showing the indicator above the "needle" on the slider.  Often this is just showing the same as
+    * the value - eg OG, FG, ABV - but sometimes it's something else - eg descriptive text such as "slightly hoppy" for
+    * the IBU/GU reading.
+    */
+   QFont const indicatorTextFont;
+
+   /**
+    * Since preferred and minimum dimensions are all based off a height we need to calculate based on the resolution of
+    * the current display (see more detailed comment in implementation of recalculateSizes()), it is useful to store
+    * that height here.  However, its value is not really part of the current value/state of the object, hence mutable
+    * (ie OK to change in a const function).
+    */
+   mutable int heightInPixels;
+};
+
+#endif