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 "../observer/observer.hpp"
#include "../utility/utility.hpp"
#include "../concurrency/concurrency.hpp"
#include "../dispatch/dispatch.hpp"
#include "../GUI/GUI.hpp"
#include "../macros.hpp"
#include <type_traits>
#include <memory>
 
hi_export_module(hikogui.widgets.button_delegate);
 
hi_export namespace hi {
inline namespace v1 {
 
class button_delegate {
public:
    virtual ~button_delegate() = default;
 
    virtual void init(widget_intf const& sender) noexcept {}
 
    virtual void deinit(widget_intf const& sender) noexcept {}
 
    virtual void activate(widget_intf const& sender) noexcept {}
 
    [[nodiscard]] virtual widget_value state(widget_intf const& sender) const noexcept
    {
        return widget_value::off;
    }
 
    template<forward_of<void()> Func>
    [[nodiscard]] callback<void()> subscribe(Func&& func, callback_flags flags = callback_flags::synchronous) noexcept
    {
        return _notifier.subscribe(std::forward<Func>(func), flags);
    }
 
protected:
    notifier<void()> _notifier;
};
 
 
 
 
} // namespace v1
} // namespace hi::v1