Trackball.hh

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#ifndef TRACKBALL_HH
#define TRACKBALL_HH
 
#include "EmuTime.hh"
#include "JoystickDevice.hh"
#include "MSXEventListener.hh"
#include "StateChangeListener.hh"
#include "serialize_meta.hh"
#include <cstdint>
 
namespace openmsx {
 
class MSXEventDistributor;
class StateChangeDistributor;
 
class Trackball final : public JoystickDevice, private MSXEventListener
                      , private StateChangeListener
{
public:
        Trackball(MSXEventDistributor& eventDistributor,
                  StateChangeDistributor& stateChangeDistributor);
        ~Trackball() override;
 
        template<typename Archive>
        void serialize(Archive& ar, unsigned version);
 
private:
        void createTrackballStateChange(EmuTime::param time,
                int deltaX, int deltaY, uint8_t press, uint8_t release);
 
        void syncCurrentWithTarget(EmuTime::param time);
 
        // Pluggable
        [[nodiscard]] std::string_view getName() const override;
        [[nodiscard]] std::string_view getDescription() const override;
        void plugHelper(Connector& connector, EmuTime::param time) override;
        void unplugHelper(EmuTime::param time) override;
 
        // JoystickDevice
        [[nodiscard]] uint8_t read(EmuTime::param time) override;
        void write(uint8_t value, EmuTime::param time) override;
 
        // MSXEventListener
        void signalMSXEvent(const Event& event,
                            EmuTime::param time) noexcept override;
        // StateChangeListener
        void signalStateChange(const StateChange& event) override;
        void stopReplay(EmuTime::param time) noexcept override;
 
private:
        MSXEventDistributor& eventDistributor;
        StateChangeDistributor& stateChangeDistributor;
 
        EmuTime lastSync = EmuTime::zero(); // last time we synced current with target
        int8_t targetDeltaX = 0, targetDeltaY = 0; // immediately follows host events
        int8_t currentDeltaX = 0, currentDeltaY = 0; // follows targetXY with some delay
        uint8_t lastValue = 0;
        uint8_t status = JOY_BUTTONA | JOY_BUTTONB;
        bool smooth = true; // always true, except for bw-compat savestates
};
SERIALIZE_CLASS_VERSION(Trackball, 2);
 
} // namespace openmsx
 
#endif