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