AreaSelectionComp.h

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namespace krotos
{
    class AreaSelectionComp : public ZoomableComponent
    {
      public:
        enum class WaveformMode
        {
            bothLines,
            onlyStartLine,
            noLine,
            modeNUM_MODES
        };
 
        class Listener
        {
          public:
            virtual ~Listener() = default;
            virtual void sampleAreaChanged(AreaSelectionComp* areaSelectionComp, float startPos, float endPos) = 0;
        };
 
        AreaSelectionComp(bool drawBackground, bool drawMarqueeBackground, bool useEndPoint);
        ~AreaSelectionComp() override;
 
        void addListener(Listener* Listener);
        void removeListener(Listener* Listener);
 
        void paint(Graphics& g) override;
 
        void setStartPointInPercentage(float percentage, float nonModulatedPercentage = -1);
        void setEndPointInPercentage(float percentage);
        float getStartPosInPercentage();
        float getEndPosInPercentage();
 
        void toggleAreaOrControl(bool toggleState);
        void determineMinSelectionWidth(float sampleRate, float numSamples);
 
        void setWaveformMode(WaveformMode mode);
 
      private:
        void modifierKeysChanged(const ModifierKeys& modifiers) override;
 
        void mouseDown(const MouseEvent& event) override;
        void mouseDrag(const MouseEvent& event) override;
        void mouseUp(const MouseEvent& event) override;
 
        ListenerList<Listener> m_listeners;
 
        float m_diff{0.f};
 
        bool m_drawBackground;
        bool m_drawMarqueeBackground;
        bool m_useEndPoint;
 
        bool m_shiftKeyPressed{false};
        bool m_shiftDragging{false};
        bool inAreaSelectMode{true};
 
        const float m_epsilon{0.0001f}; // use to fix issue due to numerical precision error
        int m_grabAreaWidth = 10;
 
        int m_selectionWidth{0};
        int m_selectionStart;
        int m_selectionEnd;
 
        float m_startPosPercentage{0.f};
        float m_endPosPercentage{1.f};
 
        float m_additionalPercentHack = 0.03f;
 
        const int m_lineWidth{2};
        const int m_clickingThreshold{5};
        const int m_minSelectionWidthMin{m_lineWidth};
        int m_minSelectionWidth{m_minSelectionWidthMin};
 
        bool m_leftBarWasSelected{false};
        bool m_rightBarWasSelected{false};
        bool m_dragging{false};
 
        WaveformMode m_waveformMode;
 
        JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(AreaSelectionComp)
    };
} // namespace krotos