PlaneVisibility.h

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// SPDX-FileCopyrightText: 2026 Valentin Eloy
// SPDX-License-Identifier: GPL-3.0-or-later
 
#pragma once
 
#include <cstddef>
#include <optional>
#include <set>

 
namespace hmi {

class PlaneVisibility {
public:
    [[nodiscard]] bool visible(std::size_t rank) const {
        if (_isolated.has_value()) {
            return *_isolated == rank;
        }
        return !_hidden.contains(rank);
    }

    void setVisible(std::size_t rank, bool visible) {
        if (visible) {
            _hidden.erase(rank);
        } else {
            _hidden.insert(rank);
        }
    }

    void isolate(std::size_t rank) {
        _isolated = rank;
    }

    void showAll() {
        _isolated.reset();
        _hidden.clear();
    }

    [[nodiscard]] std::optional<std::size_t> isolatedRank() const noexcept {
        return _isolated;
    }
 
private:
    std::optional<std::size_t> _isolated;
    std::set<std::size_t> _hidden;
};
 
}  // namespace hmi