transmission/gtk/ListModelAdapter.h

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// This file Copyright © 2022-2023 Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#pragma once
#include "GtkCompat.h"
#include <giomm/listmodel.h>
#include <glibmm/object.h>
#include <glibmm/refptr.h>
#include <glibmm/value.h>
#include <gtkmm/treemodel.h>
#include <gtkmm/treemodelcolumn.h>
#include <optional>
#include <unordered_map>
#include <vector>
class ListModelAdapter
: public Gtk::TreeModel
, public Glib::Object
{
using IdGetter = std::function<int(Glib::RefPtr<Glib::ObjectBase const> const&)>;
using ValueGetter = std::function<void(Glib::RefPtr<Glib::ObjectBase const> const&, int, Glib::ValueBase&)>;
enum class PositionAdjustment
{
DECREMENT = -1,
INCREMENT = 1,
};
struct ItemInfo
{
int id = 0;
sigc::connection notify_tag;
};
using TrTreeModelFlags = IF_GTKMM4(Gtk::TreeModel::Flags, Gtk::TreeModelFlags);
public:
template<typename T>
static Glib::RefPtr<ListModelAdapter> create(Glib::RefPtr<Gio::ListModel> const& adaptee)
{
return Glib::make_refptr_for_instance(
// NOLINTNEXTLINE(cppcoreguidelines-owning-memory)
new ListModelAdapter(adaptee, T::get_columns(), &T::get_item_id, &T::get_item_value));
}
protected:
// Gtk::TreeModel
TrTreeModelFlags get_flags_vfunc() const override;
int get_n_columns_vfunc() const override;
GType get_column_type_vfunc(int index) const override;
bool iter_next_vfunc(iterator const& iter, iterator& iter_next) const override;
bool get_iter_vfunc(Path const& path, iterator& iter) const override;
bool iter_children_vfunc(iterator const& parent, iterator& iter) const override;
bool iter_parent_vfunc(iterator const& child, iterator& iter) const override;
bool iter_nth_root_child_vfunc(int position, iterator& iter) const override;
bool iter_has_child_vfunc(const_iterator const& iter) const override;
int iter_n_root_children_vfunc() const override;
TreeModel::Path get_path_vfunc(const_iterator const& iter) const override;
void get_value_vfunc(const_iterator const& iter, int column, Glib::ValueBase& value) const override;
private:
ListModelAdapter(
Glib::RefPtr<Gio::ListModel> const& adaptee,
Gtk::TreeModelColumnRecord const& columns,
IdGetter id_getter,
ValueGetter value_getter);
std::optional<guint> find_item_position_by_id(int item_id) const;
void adjust_item_positions(guint min_position, PositionAdjustment adjustment);
void on_adaptee_items_changed(guint position, guint removed, guint added);
void on_adaptee_item_changed(Glib::RefPtr<Glib::ObjectBase const> const& item);
private:
Glib::RefPtr<Gio::ListModel> const adaptee_;
Gtk::TreeModelColumnRecord const& columns_;
IdGetter const id_getter_;
ValueGetter const value_getter_;
int const stamp_ = 1;
std::vector<ItemInfo> items_;
std::unordered_map<int, guint> mutable item_positions_;
};