mixinindex.h

Go to the documentation of this file.

// SPDX-FileCopyrightText: Copyright (C) 2013 swift Project Community / Contributors
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-swift-pilot-client-1
 
 
#ifndef SWIFT_MISC_MIXIN_MIXININDEX_H
#define SWIFT_MISC_MIXIN_MIXININDEX_H
 
#include <type_traits>
 
#include <QDBusArgument>
#include <QList>
#include <QMap>
#include <QMetaType>
#include <QString>
#include <QVariant>
#include <QtDebug>
#include <QtGlobal>
 
#include "misc/icon.h"
#include "misc/inheritancetraits.h"
#include "misc/predicates.h"
#include "misc/propertyindexref.h"
 
namespace swift::misc
{
    class CPropertyIndexList;
    class CPropertyIndexVariantMap;
 
    namespace mixin
    {
        template <class Derived>
        class Index
        {
        public:
            enum ColumnIndex
            {
                IndexPixmap = 10, // manually set to avoid circular dependencies
                IndexIcon,
                IndexString
            };
 
            CPropertyIndexList apply(const CPropertyIndexVariantMap &indexMap,
                                     bool skipEqualValues = false); // impl in propertyindexvariantmap.h
 
            void setPropertyByIndex(CPropertyIndexRef index, const QVariant &variant);
 
            QVariant propertyByIndex(CPropertyIndexRef index) const;
 
            int comparePropertyByIndex(CPropertyIndexRef index, const Derived &compareValue) const;
 
            bool equalsPropertyByIndex(const QVariant &compareValue, CPropertyIndexRef index) const;
 
        private:
            const Derived *derived() const;
            Derived *derived();
 
            template <typename T>
            QVariant myself() const;
            template <typename T>
            void myself(const QVariant &variant);
 
            template <typename T>
            QVariant basePropertyByIndex(const T *base, CPropertyIndexRef index) const;
            template <typename T>
            void baseSetPropertyByIndex(T *base, const QVariant &var, CPropertyIndexRef index);
 
            QVariant basePropertyByIndex(const void *, CPropertyIndexRef) const;
            void baseSetPropertyByIndex(void *, const QVariant &, CPropertyIndexRef);
        };
 
        template <class Derived>
        const Derived *Index<Derived>::derived() const
        {
            return static_cast<const Derived *>(this);
        }
 
        template <class Derived>
        Derived *Index<Derived>::derived()
        {
            return static_cast<Derived *>(this);
        }
 
        template <class Derived>
        template <typename T>
        QVariant Index<Derived>::myself() const
        {
            if constexpr (std::is_default_constructible_v<T>) { return QVariant::fromValue(*derived()); }
            else
            {
                qFatal("isMyself should have been handled before reaching here");
                return {};
            }
        }
 
        template <class Derived>
        template <typename T>
        void Index<Derived>::myself(const QVariant &variant)
        {
            if constexpr (std::is_default_constructible_v<T>) { *derived() = variant.value<T>(); }
            else { qFatal("isMyself should have been handled before reaching here"); }
        }
 
        template <class Derived>
        template <typename T>
        QVariant Index<Derived>::basePropertyByIndex(const T *base, CPropertyIndexRef index) const
        {
            return base->propertyByIndex(index);
        }
 
        template <class Derived>
        template <typename T>
        void Index<Derived>::baseSetPropertyByIndex(T *base, const QVariant &var, CPropertyIndexRef index)
        {
            base->setPropertyByIndex(index, var);
        }
 
        template <class Derived>
        QVariant Index<Derived>::basePropertyByIndex(const void *, CPropertyIndexRef) const
        {
            // qFatal("%s", qPrintable("Property by index not found, index: " + index.toQString())); return {};
            qFatal("Property by index not found");
            return {};
        }
 
        template <class Derived>
        void Index<Derived>::baseSetPropertyByIndex(void *, const QVariant &, CPropertyIndexRef)
        {
            // qFatal("%s", qPrintable("Property by index not found (setter), index: " + index.toQString()));
            qFatal("Property by index not found");
        }
 
#define SWIFT_MISC_DECLARE_USING_MIXIN_INDEX(DERIVED)                                                                  \
    using ::swift::misc::mixin::Index<DERIVED>::apply;                                                                 \
    using ::swift::misc::mixin::Index<DERIVED>::setPropertyByIndex;                                                    \
    using ::swift::misc::mixin::Index<DERIVED>::propertyByIndex;                                                       \
    using ::swift::misc::mixin::Index<DERIVED>::comparePropertyByIndex;                                                \
    using ::swift::misc::mixin::Index<DERIVED>::equalsPropertyByIndex;
 
        template <class Derived>
        void Index<Derived>::setPropertyByIndex(CPropertyIndexRef index, const QVariant &variant)
        {
            if (index.isMyself()) { myself<Derived>(variant); }
            else { baseSetPropertyByIndex(static_cast<TIndexBaseOfT<Derived> *>(derived()), variant, index); }
        }
 
        template <class Derived>
        QVariant Index<Derived>::propertyByIndex(CPropertyIndexRef index) const
        {
            if (index.isMyself()) { return myself<Derived>(); }
            const auto i = index.frontCasted<ColumnIndex>(); // keep that "auto", otherwise I won's compile
            switch (i)
            {
            case IndexIcon: return CIcons::toVariant(derived()->toIcon());
            case IndexPixmap: return CIcons::toVariantPixmap(derived()->toIcon());
            case IndexString: return QVariant(derived()->toQString());
            default: return basePropertyByIndex(static_cast<const TIndexBaseOfT<Derived> *>(derived()), index);
            }
        }
 
        template <class Derived>
        bool Index<Derived>::equalsPropertyByIndex(const QVariant &compareValue, CPropertyIndexRef index) const
        {
            return derived()->propertyByIndex(index) == compareValue;
        }
 
        template <class Derived>
        int Index<Derived>::comparePropertyByIndex(CPropertyIndexRef index, const Derived &compareValue) const
        {
            if (this == &compareValue) { return 0; }
            if (index.isMyself())
            {
                // slow, only last resort
                return derived()->toQString().compare(compareValue.toQString());
            }
 
            const auto i = index.frontCasted<ColumnIndex>();
            switch (i)
            {
            case IndexIcon:
            case IndexPixmap:
            case IndexString:
            default: break; // also covers
            }
 
            // slow, only last resort
            return derived()->toQString().compare(compareValue.toQString());
        }
    } // namespace mixin
} // namespace swift::misc
 
#endif // SWIFT_MISC_MIXIN_MIXININDEX_H