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fe3b846ac8
https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#cother-other-default-operation-rules "The compiler is more likely to get the default semantics right and you cannot implement these functions better than the compiler."
94 lines
2.6 KiB
C++
94 lines
2.6 KiB
C++
/*
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* Copyright (c) 2021, sin-ack <sin-ack@protonmail.com>
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* Copyright (c) 2022, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/RefCounted.h>
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#include <AK/WeakPtr.h>
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#include <LibGUI/Model.h>
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#include <LibGUI/ModelIndex.h>
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namespace GUI {
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/// A PersistentHandle is an internal data structure used to keep track of the
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/// target of multiple PersistentModelIndex instances.
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class PersistentHandle : public Weakable<PersistentHandle> {
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friend Model;
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friend PersistentModelIndex;
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friend AK::Traits<GUI::PersistentModelIndex>;
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PersistentHandle(ModelIndex const& index)
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: m_index(index)
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{
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}
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ModelIndex m_index;
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};
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class PersistentModelIndex {
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public:
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PersistentModelIndex() = default;
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PersistentModelIndex(ModelIndex const&);
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PersistentModelIndex(PersistentModelIndex const&) = default;
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PersistentModelIndex(PersistentModelIndex&&) = default;
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PersistentModelIndex& operator=(PersistentModelIndex const&) = default;
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PersistentModelIndex& operator=(PersistentModelIndex&&) = default;
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bool is_valid() const { return has_valid_handle() && m_handle->m_index.is_valid(); }
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bool has_valid_handle() const { return !m_handle.is_null(); }
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int row() const;
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int column() const;
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PersistentModelIndex parent() const;
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PersistentModelIndex sibling_at_column(int column) const;
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Variant data(ModelRole = ModelRole::Display) const;
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void* internal_data() const
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{
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if (has_valid_handle())
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return m_handle->m_index.internal_data();
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else
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return nullptr;
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}
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operator ModelIndex() const;
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bool operator==(PersistentModelIndex const&) const;
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bool operator!=(PersistentModelIndex const&) const;
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bool operator==(ModelIndex const&) const;
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bool operator!=(ModelIndex const&) const;
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private:
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friend AK::Traits<GUI::PersistentModelIndex>;
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WeakPtr<PersistentHandle> m_handle;
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};
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}
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namespace AK {
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template<>
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struct Formatter<GUI::PersistentModelIndex> : Formatter<FormatString> {
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ErrorOr<void> format(FormatBuilder& builder, GUI::PersistentModelIndex const& value)
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{
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return Formatter<FormatString>::format(builder, "PersistentModelIndex({},{},{})", value.row(), value.column(), value.internal_data());
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}
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};
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template<>
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struct Traits<GUI::PersistentModelIndex> : public GenericTraits<GUI::PersistentModelIndex> {
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static unsigned hash(const GUI::PersistentModelIndex& index)
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{
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if (index.has_valid_handle())
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return Traits<GUI::ModelIndex>::hash(index.m_handle->m_index);
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else
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return 0;
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}
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};
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}
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