coordsbase.h

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/**********************************************************************
 * LeechCraft - modular cross-platform feature rich internet client.
 * Copyright (C) 2006-2014  Georg Rudoy
 *
 * Distributed under the Boost Software License, Version 1.0.
 * (See accompanying file LICENSE or copy at https://www.boost.org/LICENSE_1_0.txt)
 **********************************************************************/

#pragma once

#include <QPointF>
#include <QRectF>

namespace LC::Monocle
{
    enum class Relativity : std::uint8_t
    {
        PageRelative,
        PageAbsolute,
        SceneAbsolute,
        ViewAbsolute,
    };

    template<Relativity R>
    struct Pos
    {
        static constexpr auto Relativity = R;

        using Type = QPointF;

        Type P_ {};

        Pos () = default;

        explicit Pos (Type p)
        : P_ { p }
        {
        }

        explicit Pos (qreal x, qreal y)
        : P_ { x, y }
        {
        }

        auto operator<=> (const Pos&) const = default;

        template<typename Self>
        [[nodiscard]]
        auto ClearedX (this const Self& self)
        {
            return Self { 0, self.P_.y () };
        }

        template<typename Self>
        [[nodiscard]]
        auto ClearedY (this const Self& self)
        {
            return Self { self.P_.x (), 0 };
        }

        template<typename Self>
        [[nodiscard]]
        Self Shifted (this const Self& self, qreal dx, qreal dy)
        {
            return Self { self.P_ + Type { dx, dy } };
        }

        Type ToPointF () const
        {
            return P_;
        }

        template<typename Self>
        Self operator+ (this Self p1, Self p2)
        {
            return Self { p1.P_ + p2.P_ };
        }

        template<typename Self>
        Self operator- (this Self p1, Self p2)
        {
            return Self { p1.P_ - p2.P_ };
        }

        template<typename Self>
        Self operator* (this Self p, qreal factor)
        {
            return Self { p.P_ * factor };
        }

        template<typename Self>
        Self operator/ (this Self p, qreal factor)
        {
            return Self { p.P_ / factor };
        }

        bool BothGeqThan (Pos p) const
        {
            return P_.x () >= p.P_.x () && P_.y () >= p.P_.y ();
        }

        bool BothLeqThan (Pos p) const
        {
            return P_.x () <= p.P_.x () && P_.y () <= p.P_.y ();
        }
    };

    template<Relativity R>
    struct Rect
    {
        static constexpr auto Relativity = R;

        using Type = QRectF;

        Type R_ {};

        Rect () = default;

        explicit Rect (const Type& r)
        : R_ { r }
        {
        }

        explicit Rect (Pos<R> topLeft, Pos<R> bottomRight)
        : R_ { topLeft.ToPointF (), bottomRight.ToPointF () }
        {
        }

        auto operator<=> (const Rect&) const = default;

        template<typename P>
            requires (P::Relativity == R)
        P TopLeft () const
        {
            return P { R_.topLeft () };
        }

        template<typename P>
            requires (P::Relativity == R)
        P BottomRight () const
        {
            return P { R_.bottomRight () };
        }

        void SetLeft (qreal x)
        {
            R_.setLeft (x);
        }

        void SetRight (qreal x)
        {
            R_.setRight (x);
        }

        Type ToRectF () const
        {
            return R_;
        }

        bool IsEmpty () const
        {
            return R_.isEmpty ();
        }

        template<typename Self>
        Self operator| (this const Self& r1, const Self& r2)
        {
            return Self { r1.R_ | r2.R_ };
        }

        template<typename Self>
        Self operator& (this const Self& r1, const Self& r2)
        {
            return Self { r1.R_ & r2.R_ };
        }
    };

    struct PageRelativePosBase;
    struct PageAbsolutePosBase;

    struct PageRelativePosBase : Pos<Relativity::PageRelative>
    {
        using Pos::Pos;

        PageAbsolutePosBase ToPageAbsolute (QSizeF) const;
    };

    struct PageAbsolutePosBase : Pos<Relativity::PageAbsolute>
    {
        using Pos::Pos;

        PageRelativePosBase ToPageRelative (QSizeF) const;
    };

    inline PageAbsolutePosBase PageRelativePosBase::ToPageAbsolute (QSizeF size) const
    {
        return PageAbsolutePosBase { P_.x () * size.width (), P_.y () * size.height () };
    }

    inline PageRelativePosBase PageAbsolutePosBase::ToPageRelative (QSizeF size) const
    {
        return PageRelativePosBase { P_.x () / size.width (), P_.y () / size.height () };
    }

    struct PageRelativeRectBase;
    struct PageAbsoluteRectBase;

    struct PageRelativeRectBase : Rect<Relativity::PageRelative>
    {
        using Rect::Rect;

        PageAbsoluteRectBase ToPageAbsolute (QSizeF) const;
    };

    struct PageAbsoluteRectBase : Rect<Relativity::PageAbsolute>
    {
        using Rect::Rect;

        PageRelativeRectBase ToPageRelative (QSizeF) const;
    };

    namespace detail
    {
        template<typename Target, typename SrcPos, typename TargetPos, typename Source, typename Ctx>
        Target Convert (TargetPos (SrcPos::*posConvert) (Ctx) const, const Source& src, const auto& context)
        {
            return Target
            {
                (src.template TopLeft<SrcPos> ().*posConvert) (context),
                (src.template BottomRight<SrcPos> ().*posConvert) (context)
            };
        }
    }

    inline PageAbsoluteRectBase PageRelativeRectBase::ToPageAbsolute (QSizeF size) const
    {
        return detail::Convert<PageAbsoluteRectBase> (&PageRelativePosBase::ToPageAbsolute, *this, size);
    }

    inline PageRelativeRectBase PageAbsoluteRectBase::ToPageRelative (QSizeF size) const
    {
        return detail::Convert<PageRelativeRectBase> (&PageAbsolutePosBase::ToPageRelative, *this, size);
    }
}

template<LC::Monocle::Relativity R>
class QTypeInfo<LC::Monocle::Pos<R>> : public QTypeInfo<QPointF> {};

template<LC::Monocle::Relativity R>
class QTypeInfo<LC::Monocle::Rect<R>> : public QTypeInfo<QRectF> {};

template<>
class QTypeInfo<LC::Monocle::PageRelativePosBase> : public QTypeInfo<QPointF> {};
template<>
class QTypeInfo<LC::Monocle::PageAbsolutePosBase> : public QTypeInfo<QPointF> {};

template<>
class QTypeInfo<LC::Monocle::PageRelativeRectBase> : public QTypeInfo<QRectF> {};
template<>
class QTypeInfo<LC::Monocle::PageAbsoluteRectBase> : public QTypeInfo<QRectF> {};