Added code

Source/CheckBoxComponent.h

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+/*
+  ==============================================================================
+
+  This is an automatically generated GUI class created by the Projucer!
+
+  Be careful when adding custom code to these files, as only the code within
+  the "//[xyz]" and "//[/xyz]" sections will be retained when the file is loaded
+  and re-saved.
+
+  Created with Projucer version: 5.4.5
+
+  ------------------------------------------------------------------------------
+
+  The Projucer is part of the JUCE library.
+  Copyright (c) 2017 - ROLI Ltd.
+
+  ==============================================================================
+*/
+
+#pragma once
+
+//[Headers]     -- You can add your own extra header files here --
+#include "../JuceLibraryCode/JuceHeader.h"
+#include "Defs.h"
+//[/Headers]
+
+
+
+//==============================================================================
+/**
+                                                                    //[Comments]
+    An auto-generated component, created by the Projucer.
+
+    Describe your class and how it works here!
+                                                                    //[/Comments]
+*/
+class CheckBoxComponent  : public Component,
+    public Button::Listener
+{
+public:
+    //==============================================================================
+    CheckBoxComponent (Magical8bitPlug2AudioProcessor& p, String paramId, String name);
+    ~CheckBoxComponent();
+
+    //==============================================================================
+    //[UserMethods]     -- You can add your own custom methods in this section.
+    void setListener (Button::Listener* lnr);
+    void removeListener();
+    //[/UserMethods]
+
+    void paint (Graphics& g) override;
+    void resized() override;
+    void buttonClicked (Button* buttonThatWasClicked) override;
+
+
+
+private:
+    //[UserVariables]   -- You can add your own custom variables in this section.
+    std::unique_ptr<ButtonAttachment> attc;
+    Button::Listener* checkBoxListener = nullptr;
+    //[/UserVariables]
+
+    //==============================================================================
+    std::unique_ptr<ToggleButton> toggleButton;
+
+
+    //==============================================================================
+    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (CheckBoxComponent)
+};
+
+//[EndFile] You can add extra defines here...
+//[/EndFile]
+