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/*
* Copyright (c) 2021, sin-ack <sin-ack@protonmail.com>
* Copyright (c) 2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/RefCounted.h>
#include <AK/WeakPtr.h>
#include <LibGUI/Model.h>
#include <LibGUI/ModelIndex.h>
namespace GUI {
/// A PersistentHandle is an internal data structure used to keep track of the
/// target of multiple PersistentModelIndex instances.
class PersistentHandle : public Weakable<PersistentHandle> {
friend Model;
friend PersistentModelIndex;
friend AK::Traits<GUI::PersistentModelIndex>;
PersistentHandle(ModelIndex const& index)
: m_index(index)
{
}
ModelIndex m_index;
};
class PersistentModelIndex {
public:
PersistentModelIndex() = default;
PersistentModelIndex(ModelIndex const&);
PersistentModelIndex(PersistentModelIndex const&) = default;
PersistentModelIndex(PersistentModelIndex&&) = default;
PersistentModelIndex& operator=(PersistentModelIndex const&) = default;
PersistentModelIndex& operator=(PersistentModelIndex&&) = default;
bool is_valid() const { return has_valid_handle() && m_handle->m_index.is_valid(); }
bool has_valid_handle() const { return !m_handle.is_null(); }
int row() const;
int column() const;
PersistentModelIndex parent() const;
PersistentModelIndex sibling_at_column(int column) const;
Variant data(ModelRole = ModelRole::Display) const;
void* internal_data() const
{
if (has_valid_handle())
return m_handle->m_index.internal_data();
else
return nullptr;
}
operator ModelIndex() const;
bool operator==(PersistentModelIndex const&) const;
bool operator!=(PersistentModelIndex const&) const;
bool operator==(ModelIndex const&) const;
bool operator!=(ModelIndex const&) const;
private:
friend AK::Traits<GUI::PersistentModelIndex>;
WeakPtr<PersistentHandle> m_handle;
};
}
namespace AK {
template<>
struct Formatter<GUI::PersistentModelIndex> : Formatter<FormatString> {
ErrorOr<void> format(FormatBuilder& builder, GUI::PersistentModelIndex const& value)
{
return Formatter<FormatString>::format(builder, "PersistentModelIndex({},{},{})"sv, value.row(), value.column(), value.internal_data());
}
};
template<>
struct Traits<GUI::PersistentModelIndex> : public GenericTraits<GUI::PersistentModelIndex> {
static unsigned hash(const GUI::PersistentModelIndex& index)
{
if (index.has_valid_handle())
return Traits<GUI::ModelIndex>::hash(index.m_handle->m_index);
return 0;
}
};
}
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