user_input.h

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#pragma once
#include <stdint.h>
#include "../hal/circular_buffer.h"
 
namespace modules {
 
namespace user_input {
 
enum Event : uint8_t {
    NoEvent = 0x7f,
    Right = 0,
    Middle = 1,
    Left = 2,
    FromPrinter = 0x80
};
 
class UserInput {
 
public:
    UserInput() = default;
 
    void Step();
 
    void ProcessMessage(uint8_t ev);
 
    Event ConsumeEvent();
 
    Event ConsumeEventForPrinter();
 
    bool AnyEvent() const { return !eventQueue.empty(); }
 
    void Clear();
 
    inline void SetPrinterInCharge(bool pc) {
        printerInCharge = pc;
    }
 
    inline bool PrinterInCharge() const {
        return printerInCharge;
    }
 
#ifndef UNITTEST
private:
#endif
    CircularBuffer<Event, uint_fast8_t, 4> eventQueue;
    bool printerInCharge = false;
    uint8_t lastButtonStates = 0; 
 
    constexpr bool LastButtonState(uint8_t button) const {
        return (lastButtonStates & (1 << button)) != 0;
    }
    void FlipLastButtonState(uint8_t button) {
        lastButtonStates ^= (1 << button);
    }
    void StepOneButton(uint8_t button);
 
    static Event StripFromPrinterBit(uint8_t e);
};
 
extern UserInput userInput;
 
} // namespace user_input
} // namespace modules
 
namespace mui = modules::user_input;