text_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 "../GUI/theme_text_style.hpp"
#include "../text/shaped_text.hpp"
#include "../observable.hpp"
#include "../alignment.hpp"
#include "../l10n.hpp"
#include <memory>
#include <string>
#include <array>
#include <optional>
#include <future>
 
namespace tt {
 
class text_widget final : public widget {
public:
    using super = widget;
 
    observable<l10n> text;
 
    observable<alignment> alignment = alignment::middle_center;
 
    observable<theme_text_style> text_style = theme_text_style::label;
 
    template<typename Text, typename Alignment = tt::alignment, typename TextStyle = tt::theme_text_style>
    text_widget(
        gui_window &window,
        widget *parent,
        Text &&text,
        Alignment &&alignment = alignment::middle_center,
        TextStyle &&text_style = theme_text_style::label) noexcept :
        text_widget(window, parent)
    {
        this->text = std::forward<Text>(text);
        this->alignment = std::forward<Alignment>(alignment);
        this->text_style = std::forward<TextStyle>(text_style);
    }
 
    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:
    decltype(text)::callback_ptr_type _text_callback;
 
    shaped_text _shaped_text;
    matrix2 _shaped_text_transform;
 
    text_widget(gui_window &window, widget *parent) noexcept;
};
 
} // namespace tt