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#pragma once
#include "slider.hpp"
#include "export.hpp"
#include <cmath>
#include <type_traits>
#include <QString>
namespace options::detail {
template<typename t>
using cv_qualified =
std::conditional_t<std::is_fundamental_v<std::remove_cvref_t<t>>,
std::remove_cvref_t<t>,
std::add_lvalue_reference_t<std::add_const_t<std::remove_cvref_t<t>>>>;
template<typename t, typename u = t, typename Enable = void>
struct default_value_traits
{
using value_type = t;
using stored_type = u;
static inline
value_type value_with_default(cv_qualified<value_type> val, cv_qualified<value_type>)
{
return val;
}
static inline
value_type value_from_storage(cv_qualified<stored_type> x)
{
return static_cast<value_type>(x);
}
static inline
stored_type storage_from_value(cv_qualified<value_type> val)
{
return static_cast<stored_type>(val);
}
static inline
value_type value_from_qvariant(const QVariant& x)
{
return value_from_storage(storage_from_qvariant(x));
}
static inline
QVariant qvariant_from_value(cv_qualified<value_type> val)
{
return qvariant_from_storage(storage_from_value(val));
}
static constexpr inline
value_type pass_value(cv_qualified<value_type> x)
{
if constexpr(std::is_same_v<value_type, stored_type>)
return x;
else
return value_from_storage(storage_from_value(x));
}
static inline
stored_type storage_from_qvariant(const QVariant& x)
{
// XXX TODO
return x.value<stored_type>();
}
static inline
QVariant qvariant_from_storage(cv_qualified<stored_type> val)
{
// XXX TODO
return QVariant::fromValue<stored_type>(val);
}
static inline
bool is_equal(cv_qualified<value_type> x, cv_qualified<value_type> y)
{
return x == y;
}
};
template<typename t, typename Enable = void>
struct value_traits : default_value_traits<t> {};
template<>
inline
bool default_value_traits<double>::is_equal(double x, double y)
{
return std::fabs(x - y) < 1e-6;
}
template<> struct value_traits<float, double> : default_value_traits<float> {};
template<>
inline
bool default_value_traits<float, double>::is_equal(float x, float y)
{
return std::fabs(x - y) < 1e-6f;
}
template<>
inline
slider_value default_value_traits<slider_value>::value_with_default(cv_qualified<slider_value> val, cv_qualified<slider_value> def)
{
return { val.cur(), def.min(), def.max() };
}
template<>
inline
bool default_value_traits<slider_value>::is_equal(cv_qualified<slider_value> x, cv_qualified<slider_value> y)
{
return value_traits<double>::is_equal(x.cur(), y.cur());
}
// Qt uses int a lot in slots so use it for all enums
template<typename t>
struct value_traits<t, std::enable_if_t<std::is_enum_v<t>>> : default_value_traits<t, int> {};
} // ns options::detail
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