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112 lines
4 KiB
C++
112 lines
4 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/Badge.h>
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#include <AK/Function.h>
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#include <AK/HashTable.h>
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#include <AK/RefCounted.h>
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#include <AK/String.h>
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#include <LibGUI/ModelIndex.h>
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#include <LibGUI/ModelRole.h>
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#include <LibGUI/Variant.h>
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#include <LibGfx/Forward.h>
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#include <LibGfx/TextAlignment.h>
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namespace GUI {
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enum class SortOrder {
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None,
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Ascending,
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Descending
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};
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class ModelClient {
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public:
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virtual ~ModelClient() { }
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virtual void model_did_update(unsigned flags) = 0;
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};
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class Model : public RefCounted<Model> {
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public:
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enum UpdateFlag {
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DontInvalidateIndexes = 0,
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InvalidateAllIndexes = 1 << 0,
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};
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virtual ~Model();
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virtual int row_count(const ModelIndex& = ModelIndex()) const = 0;
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virtual int column_count(const ModelIndex& = ModelIndex()) const = 0;
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virtual String column_name(int) const { return {}; }
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virtual Variant data(const ModelIndex&, ModelRole = ModelRole::Display) const = 0;
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virtual TriState data_matches(const ModelIndex&, Variant) const { return TriState::Unknown; }
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virtual void update() = 0;
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virtual ModelIndex parent_index(const ModelIndex&) const { return {}; }
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virtual ModelIndex index(int row, int column = 0, const ModelIndex& parent = ModelIndex()) const;
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virtual bool is_editable(const ModelIndex&) const { return false; }
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virtual void set_data(const ModelIndex&, const Variant&) { }
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virtual int tree_column() const { return 0; }
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virtual bool accepts_drag(const ModelIndex&, const StringView& data_type);
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virtual bool is_column_sortable([[maybe_unused]] int column_index) const { return true; }
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virtual void sort([[maybe_unused]] int column, SortOrder) { }
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bool is_valid(const ModelIndex& index) const
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{
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auto parent_index = this->parent_index(index);
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return index.row() >= 0 && index.row() < row_count(parent_index) && index.column() >= 0 && index.column() < column_count(parent_index);
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}
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virtual StringView drag_data_type() const { return {}; }
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void register_view(Badge<AbstractView>, AbstractView&);
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void unregister_view(Badge<AbstractView>, AbstractView&);
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void register_client(ModelClient&);
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void unregister_client(ModelClient&);
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protected:
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Model();
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void for_each_view(Function<void(AbstractView&)>);
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void did_update(unsigned flags = UpdateFlag::InvalidateAllIndexes);
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ModelIndex create_index(int row, int column, const void* data = nullptr) const;
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private:
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HashTable<AbstractView*> m_views;
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HashTable<ModelClient*> m_clients;
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};
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inline ModelIndex ModelIndex::parent() const
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{
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return m_model ? m_model->parent_index(*this) : ModelIndex();
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}
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}
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