OB-Xd/Source/Gui/Knob.h

/*
	==============================================================================
	This file is part of Obxd synthesizer.

	Copyright <EFBFBD> 2013-2014 Filatov Vadim
	
	Contact author via email :
	justdat_@_e1.ru

	This file may be licensed under the terms of of the
	GNU General Public License Version 2 (the ``GPL'').

	Software distributed under the License is distributed
	on an ``AS IS'' basis, WITHOUT WARRANTY OF ANY KIND, either
	express or implied. See the GPL for the specific language
	governing rights and limitations.

	You should have received a copy of the GPL along with this
	program. If not, go to http://www.gnu.org/licenses/gpl.html
	or write to the Free Software Foundation, Inc.,  
	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
	==============================================================================
 */
#pragma once
#include "../Source/Engine/SynthEngine.h"

class Knob  : public Slider
{
public:
	//Knob(Image image, const int numFrames, const bool stripIsHorizontal) : Slider("Knob")
	//{
		
	//	setTextBoxStyle(NoTextBox, 0, 0, 0);
	//	setSliderStyle(RotaryVerticalDrag);
	//	setRange(0.0f, 1.0f, 0.001f);
	//}
	Knob (Image k, int fh) : Slider("Knob")
	{
		h2 = fh;
		w2 = k.getWidth();
		numFr = k.getHeight() / h2;
		kni = k;
	};

// Source: https://git.iem.at/audioplugins/IEMPluginSuite/-/blob/master/resources/customComponents/ReverseSlider.h
public:
    class KnobAttachment  : public juce::AudioProcessorValueTreeState::SliderAttachment
    {
    public:
        KnobAttachment (juce::AudioProcessorValueTreeState& stateToControl,
                        const juce::String& parameterID,
                        Knob& sliderToControl) : AudioProcessorValueTreeState::SliderAttachment (stateToControl, parameterID, sliderToControl)
        {
            sliderToControl.setParameter (stateToControl.getParameter (parameterID));
        }
        
        KnobAttachment (juce::AudioProcessorValueTreeState& stateToControl,
                        const juce::String& parameterID,
                        Slider& sliderToControl) : AudioProcessorValueTreeState::SliderAttachment (stateToControl, parameterID, sliderToControl)
        {
        }
        
        virtual ~KnobAttachment() = default;
    };
    
    void setParameter (const AudioProcessorParameter* p)
    {
        if (parameter == p)
            return;
        
        parameter = p;
        updateText();
        repaint();
    }

	void paint (Graphics& g) override
	{
		int ofs = (int) ((getValue() - getMinimum()) / (getMaximum() - getMinimum()) * (numFr - 1));
        g.drawImage (kni, 0, 0, getWidth(), getHeight(), 0, h2 * ofs, w2, h2);
	}
    
    ~Knob() override {};
private:
	Image kni;
	int fh, numFr;
	int w2, h2;
    const AudioProcessorParameter* parameter {nullptr};
};