button_delegate.hpp

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// 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 "../notifier.hpp"
#include "../observer.hpp"
#include "../GUI/module.hpp"
#include <type_traits>
#include <memory>
 
namespace hi { inline namespace v1 {
class widget;
 
class button_delegate {
public:
    using notifier_type = notifier<>;
    using callback_token = notifier_type::callback_token;
    using callback_proto = notifier_type::callback_proto;
 
    virtual ~button_delegate() = default;
 
    virtual void init(widget& sender) noexcept {}
 
    virtual void deinit(widget& sender) noexcept {}
 
    virtual void activate(widget& sender) noexcept {};
 
    [[nodiscard]] virtual widget_state state(widget const& sender) const noexcept
    {
        return widget_state::off;
    }
 
    [[nodiscard]] callback_token
    subscribe(forward_of<callback_proto> auto&& callback, callback_flags flags = callback_flags::synchronous) noexcept
    {
        return _notifier.subscribe(hi_forward(callback), flags);
    }
 
protected:
    notifier_type _notifier;
};
 
 
}} // namespace hi::v1