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/* Copyright (c) 2015-2016, Stanislaw Halik <sthalik@misaki.pl>
* Permission to use, copy, modify, and/or distribute this
* software for any purpose with or without fee is hereby granted,
* provided that the above copyright notice and this permission
* notice appear in all copies.
*/
#pragma once
#include "export.hpp"
#include "bundle.hpp"
#include "slider.hpp"
#include "base-value.hpp"
#include "value-traits.hpp"
#include <type_traits>
#include <utility>
#include <QMetaType>
namespace options::detail {
template<typename t>
class dereference_wrapper final
{
t x;
public:
constexpr t* operator->() { return &x; }
constexpr explicit dereference_wrapper(t&& x) : x(x) {}
};
template<typename t, typename...> /*MSVC workaround*/ static constexpr bool is_enum_v = std::is_enum_v<t>;
} // ns options::detail
namespace options {
template<typename t>
class value final : public value_
{
static_assert(std::is_same_v<t, std::remove_cvref_t<t>>);
mutable QMutex mtx;
const t def;
mutable t cached_value;
using traits = detail::value_traits<t>;
never_inline
auto get() const noexcept
{
if (!b->contains(self_name))
return traits::pass_value(def);
QVariant variant = b->get_variant(self_name);
if (variant.isNull() || !variant.isValid())
return traits::pass_value(def);
return traits::pass_value(traits::value_with_default(traits::value_from_qvariant(variant), def));
}
never_inline
void store_variant(QVariant&& value) noexcept override
{
if (traits::is_equal(get(), traits::value_from_qvariant(value)))
return;
if (is_null())
return;
if (value.isValid() && !value.isNull())
b->store_kv(self_name, value);
else
b->store_kv(self_name, traits::qvariant_from_value(def));
}
never_inline
void store_variant(const QVariant& value) noexcept override
{
QVariant copy{value};
store_variant(std::move(copy));
}
bool is_null() const
{
return self_name.isEmpty() || b->name().isEmpty();
}
public:
using signal_sig = typename value_::signal_sig_<t>;
using slot_sig = typename value_::slot_sig_<t>;
QVariant get_variant() const noexcept override
{
if (QVariant ret{b->get_variant(self_name)}; ret.isValid() && !ret.isNull())
return ret;
return traits::qvariant_from_value(def);
}
never_inline
void notify_() const override
{
auto x = get();
{
QMutexLocker l(&mtx);
cached_value = x;
}
maybe_trace("notify +");
emit valueChanged(traits::storage_from_value(x));
maybe_trace("notify -");
}
never_inline
void notify() const override
{
if (is_null())
return;
auto x = get();
{
QMutexLocker l(&mtx);
if (traits::is_equal(x, cached_value))
{
//maybe_trace("notify ~");
return;
}
else
{
cached_value = x;
l.unlock();
maybe_trace("notify +");
emit valueChanged(traits::storage_from_value(x));
maybe_trace("notify -");
}
}
}
auto& operator=(t&& datum) noexcept
{
if (is_null())
return *this;
store_variant(traits::qvariant_from_value(traits::pass_value(datum)));
return *this;
}
auto& operator=(const t& datum) noexcept
{
if (is_null())
return *this;
t copy{datum};
*this = std::move(copy);
return *this;
}
auto& operator=(const value<t>& datum) noexcept
{
*this = *datum;
return *this;
}
static constexpr Qt::ConnectionType DIRECT_CONNTYPE = Qt::DirectConnection;
static constexpr Qt::ConnectionType SAFE_CONNTYPE = Qt::QueuedConnection;
value(bundle b, const QString& name, t def) noexcept : value_(b, name), def(std::move(def)), cached_value{get()}
{
}
//value(const value<t>& other) noexcept : value{other.b, other.self_name, other.def} {}
value(const value<t>&) = delete;
t default_value() const
{
return def;
}
void set_to_default() noexcept override
{
*this = def;
}
operator t() const { return get(); }
template<typename u>
explicit force_inline operator u() const { return to<u>(); }
auto operator->() const noexcept
{
return detail::dereference_wrapper<t>{get()};
}
force_inline auto operator()() const noexcept { return get(); }
force_inline auto operator*() const noexcept { return get(); }
template<typename u>
u to() const noexcept
{
return static_cast<u>(get());
}
template<typename Q, typename F>
QMetaObject::Connection
connect_to(Q* qobject, F&& writer, Qt::ConnectionType conn = Qt::QueuedConnection) {
return QObject::connect(this, static_cast<signal_sig>(&value<t>::valueChanged), qobject, std::forward<F>(writer), conn);
}
template<typename Q, typename F>
QMetaObject::Connection
connect_from(Q* qobject, F&& reader, Qt::ConnectionType conn = Qt::DirectConnection) {
return QObject::connect(qobject, std::forward<F>(reader), this, static_cast<slot_sig>(&value<t>::setValue), conn);
}
template<typename Q, typename F, typename G>
QMetaObject::Connection
connect_from(Q* qobject, F&& reader, G&& fn, Qt::ConnectionType conn = Qt::DirectConnection) {
return QObject::connect(qobject, std::forward<F>(reader), this, std::forward<G>(fn), conn);
}
};
#if !defined OTR_OPTIONS_INST_VALUE
# define OTR_OPTIONS_INST_VALUE OTR_TEMPLATE_IMPORT
#endif
OTR_OPTIONS_INST_VALUE(value<double>)
OTR_OPTIONS_INST_VALUE(value<float>)
OTR_OPTIONS_INST_VALUE(value<int>)
OTR_OPTIONS_INST_VALUE(value<bool>)
OTR_OPTIONS_INST_VALUE(value<QString>)
OTR_OPTIONS_INST_VALUE(value<slider_value>)
OTR_OPTIONS_INST_VALUE(value<QPointF>)
OTR_OPTIONS_INST_VALUE(value<QVariant>)
OTR_OPTIONS_INST_VALUE(value<QList<double>>)
OTR_OPTIONS_INST_VALUE(value<QList<float>>)
OTR_OPTIONS_INST_VALUE(value<QList<int>>)
OTR_OPTIONS_INST_VALUE(value<QList<bool>>)
OTR_OPTIONS_INST_VALUE(value<QList<QString>>)
OTR_OPTIONS_INST_VALUE(value<QList<slider_value>>)
OTR_OPTIONS_INST_VALUE(value<QList<QPointF>>)
OTR_OPTIONS_INST_VALUE(value<QList<QVariant>>)
} // ns options
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