icon_widget.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 "widget.hpp"
#include "../GFX/draw_context.hpp"
#include "../GFX/pipeline_image_image.hpp"
#include "../GUI/theme_color.hpp"
#include "../alignment.hpp"
#include "../icon.hpp"
#include <memory>
#include <string>
#include <array>
#include <optional>
#include <future>
 
namespace tt {
 
class icon_widget final : public widget {
public:
    using super = widget;
 
    observable<icon> icon;
 
    observable<theme_color> color = theme_color::foreground;
 
    observable<alignment> alignment = alignment::middle_center;
 
    template<typename Icon, typename Color = tt::theme_color>
    icon_widget(
        gui_window &window,
        widget *parent, Icon &&icon, Color &&color = theme_color::foreground) noexcept :
        icon_widget(window, parent)
    {
        this->icon = std::forward<Icon>(icon);
        this->color = std::forward<Color>(color);
    }
 
    void init() noexcept override;
    [[nodiscard]] bool constrain(utc_nanoseconds display_time_point, bool need_reconstrain) noexcept override;
    [[nodiscard]] void layout(utc_nanoseconds displayTimePoint, bool need_layout) noexcept override;
    void draw(draw_context context, utc_nanoseconds display_time_point) noexcept override;
private:
    enum class icon_type { no, glyph, pixmap };
 
    decltype(icon)::callback_ptr_type _icon_callback;
 
    icon_type _icon_type;
    font_glyph_ids _glyph;
    size_t _pixmap_hash;
    pipeline_image::image _pixmap_backing;
 
    aarectangle _icon_bounding_box;
    matrix2 _icon_transform;
 
    icon_widget(gui_window &window, widget *parent) noexcept;
};
 
} // namespace tt