selection_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 "../label.hpp"
#include <memory>
#include <functional>
#include <vector>
 
namespace hi::inline v1 {
class selection_widget;
 
class selection_delegate {
public:
    virtual ~selection_delegate() = default;
 
    virtual void init(selection_widget &sender) noexcept {}
 
    virtual void deinit(selection_widget &sender) noexcept {}
 
    auto subscribe(selection_widget& sender, callback_flags flags, std::invocable<> auto&& callback) noexcept
    {
        return _notifier.subscribe(flags, hi_forward(callback));
    }
 
    auto subscribe(selection_widget& sender, std::invocable<> auto&& callback) noexcept
    {
        return subscribe(sender, callback_flags::synchronous, hi_forward(callback));
    }
 
    virtual void set_selected(selection_widget &sender, ssize_t index) noexcept {};
 
    virtual std::pair<std::vector<label>, ssize_t> options_and_selected(selection_widget const &sender) const noexcept
    {
        return {{}, -1};
    }
 
protected:
    notifier<> _notifier;
};
 
} // namespace hi::inline v1