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#pragma once
#include "displayapp/screens/Screen.h"
#include "displayapp/apps/Apps.h"
#include "displayapp/Controllers.h"
#include "Symbols.h"
namespace {
constexpr int64_t powi(int64_t base, uint8_t exponent) {
int64_t value = 1;
while (exponent) {
value *= base;
exponent--;
}
return value;
}
}
namespace Pinetime {
namespace Applications {
namespace Screens {
class Calculator : public Screen {
public:
~Calculator() override;
Calculator();
void OnButtonEvent(lv_obj_t* obj, lv_event_t event);
private:
lv_obj_t* buttonMatrix {};
lv_obj_t* valueLabel {};
lv_obj_t* resultLabel {};
void Eval();
void ResetInput();
void HandleInput();
void UpdateValueLabel();
void UpdateResultLabel() const;
void UpdateOperation() const;
// change this if you want to change the number of decimals
// keep in mind, that we only have 12 digits in total (see MAX_DIGITS)
// due to the fixed point implementation
static constexpr uint8_t N_DECIMALS = 3;
// this is the constant default offset
static constexpr int64_t FIXED_POINT_OFFSET = powi(10, N_DECIMALS);
// this is the current offset, may vary after pressing '.'
int64_t offset = FIXED_POINT_OFFSET;
// the screen can show 12 chars
// but two are needed for '.' and '-'
static constexpr uint8_t MAX_DIGITS = 12;
static constexpr int64_t MAX_VALUE = powi(10, MAX_DIGITS) - 1;
// this is assumed in the multiplication overflow!
static constexpr int64_t MIN_VALUE = -MAX_VALUE;
int64_t value = 0;
int64_t result = 0;
char operation = ' ';
bool equalSignPressedBefore = false;
enum Error {
TooLarge,
ZeroDivision,
None,
};
Error error = Error::None;
};
}
template <>
struct AppTraits<Apps::Calculator> {
static constexpr Apps app = Apps::Calculator;
static constexpr const char* icon = Screens::Symbols::calculator;
static Screens::Screen* Create(AppControllers& /* controllers */) {
return new Screens::Calculator();
};
};
}
}
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