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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <LibGUI/Model.h>
namespace GUI {
class SortingProxyModel
: public Model
, private ModelClient {
public:
static ErrorOr<NonnullRefPtr<SortingProxyModel>> create(NonnullRefPtr<Model> source)
{
return adopt_nonnull_ref_or_enomem(new (nothrow) SortingProxyModel(move(source)));
}
virtual ~SortingProxyModel() override;
virtual int tree_column() const override { return m_source->tree_column(); }
virtual int row_count(ModelIndex const& = ModelIndex()) const override;
virtual int column_count(ModelIndex const& = ModelIndex()) const override;
virtual String column_name(int) const override;
virtual Variant data(ModelIndex const&, ModelRole = ModelRole::Display) const override;
virtual void invalidate() override;
virtual StringView drag_data_type() const override;
virtual ModelIndex parent_index(ModelIndex const&) const override;
virtual ModelIndex index(int row, int column, ModelIndex const& parent) const override;
virtual bool is_editable(ModelIndex const&) const override;
virtual bool is_searchable() const override;
virtual void set_data(ModelIndex const&, Variant const&) override;
virtual Vector<ModelIndex> matches(StringView, unsigned = MatchesFlag::AllMatching, ModelIndex const& = ModelIndex()) override;
virtual bool accepts_drag(ModelIndex const&, Vector<String> const& mime_types) const override;
virtual bool is_column_sortable(int column_index) const override;
virtual bool less_than(ModelIndex const&, ModelIndex const&) const;
ModelIndex map_to_source(ModelIndex const&) const;
ModelIndex map_to_proxy(ModelIndex const&) const;
ModelRole sort_role() const { return m_sort_role; }
void set_sort_role(ModelRole role) { m_sort_role = role; }
virtual void sort(int column, SortOrder) override;
private:
explicit SortingProxyModel(NonnullRefPtr<Model> source);
// NOTE: The internal_data() of indices points to the corresponding Mapping object for that index.
struct Mapping {
Vector<int> source_rows;
Vector<int> proxy_rows;
ModelIndex source_parent;
};
using InternalMapIterator = HashMap<ModelIndex, NonnullOwnPtr<Mapping>>::IteratorType;
void sort_mapping(Mapping&, int column, SortOrder);
// ^ModelClient
virtual void model_did_update(unsigned) override;
Model& source() { return *m_source; }
Model const& source() const { return *m_source; }
void update_sort(unsigned = UpdateFlag::DontInvalidateIndices);
InternalMapIterator build_mapping(ModelIndex const& proxy_index);
NonnullRefPtr<Model> m_source;
HashMap<ModelIndex, NonnullOwnPtr<Mapping>> m_mappings;
ModelRole m_sort_role { ModelRole::Sort };
int m_last_key_column { -1 };
SortOrder m_last_sort_order { SortOrder::Ascending };
};
}
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