button_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 "button_state.hpp"
#include <memory>
#include <functional>
 
namespace hi::inline v1 {
class abstract_button_widget;
 
class button_delegate {
public:
    virtual ~button_delegate() = default;
 
    virtual void init(abstract_button_widget &sender) noexcept {}
 
    virtual void deinit(abstract_button_widget &sender) noexcept {}
 
    [[nodiscard]] auto subscribe(abstract_button_widget &sender, callback_flags flags, std::invocable<> auto &&callback) noexcept
    {
        return _notifier.subscribe(flags, hi_forward(callback));
    }
 
    [[nodiscard]] auto subscribe(abstract_button_widget& sender, std::invocable<> auto&& callback) noexcept
    {
        return subscribe(sender, callback_flags::synchronous, hi_forward(callback));
    }
 
    virtual void activate(abstract_button_widget &sender) noexcept {};
 
    [[nodiscard]] virtual button_state state(abstract_button_widget const &sender) const noexcept
    {
        return button_state::off;
    }
 
protected:
    notifier<> _notifier;
};
 
} // namespace hi::inline v1