NumericIndicator.h

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#ifndef NUMERICINDICATOR_H_
#define NUMERICINDICATOR_H_
 
#include "../Core/UIElement.h"
 
#define DEFAULT_NUMERIC_INDICATOR_STRING_LENGTH     15                      

template <class T>
class NumericIndicator : public UIElement
{
    private:
        void calculateDisplayValue(float value);

        uint8_t numNonFractionalDigits(T number);
        
        const char* _unitPrefix;                     
        char* _stringDrawBuffer;                       
        
    protected:
        const char* _baseUnit;                         
        T* _valuePointer;                              
        T _lastValueDraw;                             
        T _maxValue;                                   
        uint8_t _numFractionalDigits;                   
        uint8_t _numDigits;                               
 
        float _displayValue;                           
        int8_t _unitPrefixPower;                        
 
    public:
    
        NumericIndicator(T* valuePointer, const char* baseUnit, T maxValue, unsigned char numFractionalDigits, uint16_t locX = 0, uint16_t locY = 0, uint8_t maxStringBufferLength = DEFAULT_NUMERIC_INDICATOR_STRING_LENGTH);
        
        ~NumericIndicator()
        {
            delete _stringDrawBuffer;
            _stringDrawBuffer = NULL;
        }

        virtual void Draw(bool redraw) override;

        virtual void RecalculateDimensions() override;
};
 
#endif /* NUMERICINDICATOR_H_ */