tab_delegate.hpp

// Copyright Take Vos 2021.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
 
#pragma once
 
#include <memory>
#include <functional>
 
namespace tt {
class tab_widget;
 
class tab_delegate {
public:
    using callback_type = std::function<void()>;
    using callback_ptr_type = std::shared_ptr<callback_type>;
 
    virtual ~tab_delegate() = default;
    virtual void init(tab_widget &sender) noexcept {}
    virtual void deinit(tab_widget &sender) noexcept {}
 
    virtual callback_ptr_type subscribe(tab_widget &sender, callback_ptr_type const &callback_ptr) noexcept
    {
        return callback_ptr;
    }
 
    virtual void unsubscribe(tab_widget &sender, callback_ptr_type const &callback_ptr) noexcept
    {
    }
 
    template<typename Callback>
    requires(std::is_invocable_v<Callback>) [[nodiscard]] callback_ptr_type
        subscribe(tab_widget &sender, Callback &&callback) noexcept
    {
        return subscribe(sender, std::make_shared<callback_type>(std::forward<Callback>(callback)));
    }
 
    virtual void add_tab(tab_widget &sender, size_t key, size_t index) noexcept
    {
    }
 
    virtual ssize_t index(tab_widget &sender) noexcept
    {
        return -1;
    }
};
 
} // namespace tt