MRTouchpadController.h

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#pragma once
 
#include "MRViewerEventsListener.h"
#include "MRViewport.h"
#include "MRTouchpadParameters.h"
 
#include <functional>
#include <memory>
 
struct GLFWwindow;
 
namespace MR
{
 
class TouchpadController : public MultiListener<
    TouchpadRotateGestureBeginListener, TouchpadRotateGestureUpdateListener, TouchpadRotateGestureEndListener,
    TouchpadSwipeGestureBeginListener, TouchpadSwipeGestureUpdateListener, TouchpadSwipeGestureEndListener,
    TouchpadZoomGestureBeginListener, TouchpadZoomGestureUpdateListener, TouchpadZoomGestureEndListener
>
{
public:
    MR_ADD_CTOR_DELETE_MOVE( TouchpadController );
 
    MRVIEWER_API void initialize( GLFWwindow* window );
    MRVIEWER_API void reset();
 
    [[nodiscard]] MRVIEWER_API const TouchpadParameters& getParameters() const;
    MRVIEWER_API void setParameters( const TouchpadParameters& parameters );
 
    class Handler
    {
    public:
        virtual ~Handler() = default;
 
        enum class GestureState
        {
            Begin,
            Update,
            End,
        };
 
        void mouseScroll( float dx, float dy, bool kinetic );
        void rotate( float angle, GestureState state );
        void swipe( float dx, float dy, bool kinetic, GestureState state );
        void zoom( float scale, bool kinetic, GestureState state );
    };
 
private:
    std::unique_ptr<Handler> handler_;
    TouchpadParameters parameters_;
 
    Viewport::Parameters initRotateParams_;
    virtual bool touchpadRotateGestureBegin_() override;
    virtual bool touchpadRotateGestureUpdate_( float angle ) override;
    virtual bool touchpadRotateGestureEnd_() override;
 
    TouchpadParameters::SwipeMode currentSwipeMode_{ TouchpadParameters::SwipeMode::SwipeRotatesCamera };
    virtual bool touchpadSwipeGestureBegin_() override;
    virtual bool touchpadSwipeGestureUpdate_( float deltaX, float deltaY, bool kinetic ) override;
    virtual bool touchpadSwipeGestureEnd_() override;
 
    Viewport::Parameters initZoomParams_;
    virtual bool touchpadZoomGestureBegin_() override;
    virtual bool touchpadZoomGestureUpdate_( float scale, bool kinetic ) override;
    virtual bool touchpadZoomGestureEnd_() override;
};
 
} // namespace MR