overlay_widget.hpp

// Copyright Take Vos 2020-2021.
// 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 "widget.hpp"
#include "overlay_delegate.hpp"
 
namespace tt {
 
class overlay_widget final : public widget {
public:
    using super = widget;
    using delegate_type = overlay_delegate;
 
    overlay_widget(gui_window &window, widget *parent, std::weak_ptr<delegate_type> delegate = {}) noexcept;
 
    template<typename Widget, typename... Args>
    Widget &make_widget(Args &&...args) noexcept
    {
        tt_axiom(is_gui_thread());
        tt_axiom(not _content);
 
        auto &widget = super::make_widget<Widget>(std::forward<Args>(args)...);
        _content = &widget;
        return widget;
    }
 
    void init() noexcept override;
    void deinit() noexcept override;
    [[nodiscard]] bool constrain(utc_nanoseconds display_time_point, bool need_reconstrain) noexcept override;
    [[nodiscard]] void layout(utc_nanoseconds display_time_point, bool need_layout) noexcept override;
    void draw(draw_context context, utc_nanoseconds display_time_point) noexcept override;
    [[nodiscard]] color background_color() const noexcept override;
    [[nodiscard]] color foreground_color() const noexcept override;
    void scroll_to_show(tt::rectangle rectangle) noexcept override;
private:
    std::weak_ptr<delegate_type> _delegate;
    widget *_content = nullptr;
 
    void draw_background(draw_context context) noexcept;
};
 
} // namespace tt