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#pragma once
#include "slider.hpp"
#include "export.hpp"
#include <QString>
#include <cinttypes>
#include <type_traits>
namespace options::detail {
template<typename t, typename Enable = void>
struct value_traits;
template<typename t, typename u = t, typename Enable = void>
struct default_value_traits
{
using stored_type = std::decay_t<u>;
using value_type = std::decay_t<t>;
using self = value_traits<t>;
static value_type value_with_default(const value_type& val, const value_type&)
{
return val;
}
static value_type value_from_storage(const stored_type& x)
{
return static_cast<value_type>(x);
}
static stored_type storage_from_value(const value_type& val)
{
return static_cast<stored_type>(val);
}
static value_type value_from_qvariant(const QVariant& x)
{
return self::value_from_storage(self::storage_from_qvariant(x));
}
static QVariant qvariant_from_value(const value_type& val)
{
return self::qvariant_from_storage(self::storage_from_value(val));
}
static constexpr inline
value_type pass_value(const value_type& x)
{
if constexpr(std::is_same_v<value_type, stored_type>)
return x;
else
return self::value_from_storage(self::storage_from_value(x));
}
static stored_type storage_from_qvariant(const QVariant& x)
{
// XXX TODO
return x.value<stored_type>();
}
static QVariant qvariant_from_storage(const stored_type& val)
{
// XXX TODO
return QVariant::fromValue<stored_type>(val);
}
static bool is_equal(const value_type& x, const value_type& y)
{
return x == y;
}
};
template<typename t, typename Enable>
struct value_traits : default_value_traits<t> {};
template<>
struct value_traits<double> : default_value_traits<double>
{
static bool is_equal(value_type x, value_type y)
{
if (x == y)
return true;
else
{
using I = std::int64_t;
constexpr int K = 1000;
value_type x_, y_;
return I(std::round(std::modf(x, &x_) * K)) == I(std::round(std::modf(y, &y_) * K)) &&
I(std::round(x_)) == I(std::round(y_));
}
}
};
template<> struct value_traits<bool> : default_value_traits<bool, int>
{
static stored_type storage_from_qvariant(const QVariant& x)
{
if (x.type() == QVariant::String)
return x.toBool();
else
return !!x.toInt();
}
static QVariant qvariant_from_storage(const stored_type& val)
{
return QVariant::fromValue<int>(!!val);
}
static value_type value_from_storage(const stored_type& x)
{
return !!x;
}
};
template<> struct value_traits<float> : value_traits<float, double>
{
static constexpr inline value_type pass_value(const value_type& x) { return x; }
};
template<>
struct value_traits<slider_value> : default_value_traits<slider_value>
{
static slider_value value_with_default(const slider_value& val, const slider_value& def)
{
return { val.cur(), def.min(), def.max() };
}
static bool is_equal(const slider_value& x, const slider_value& y)
{
using tr = value_traits<double>;
return tr::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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