text_field_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 "text_field_delegate.hpp"
#include "default_text_field_delegate.hpp"
#include "widget.hpp"
#include "label_widget.hpp"
#include "scroll_widget.hpp"
#include "../label.hpp"
#include "../weak_or_unique_ptr.hpp"
#include <memory>
#include <string>
#include <array>
#include <optional>
#include <future>
 
namespace hi::inline v1 {
 
class text_field_widget final : public widget {
public:
    using delegate_type = text_field_delegate;
    using super = widget;
 
    observable<bool> continues = false;
 
    observable<semantic_text_style> text_style = semantic_text_style::label;
 
    virtual ~text_field_widget();
 
    text_field_widget(gui_window &window, widget *parent, std::weak_ptr<delegate_type> delegate) noexcept;
 
    template<typename Value>
    text_field_widget(gui_window &window, widget *parent, Value &&value) noexcept
        requires(not std::is_convertible_v<Value, weak_or_unique_ptr<delegate_type>>) :
        text_field_widget(window, parent, make_unique_default_text_field_delegate(std::forward<Value>(value)))
    {
    }
 
    [[nodiscard]] generator<widget *> children() const noexcept override
    {
        co_yield _scroll_widget.get();
    }
    widget_constraints const &set_constraints() noexcept override;
    void set_layout(widget_layout const &layout) noexcept override;
    void draw(draw_context const &context) noexcept override;
    bool handle_event(gui_event const& event) noexcept override;
    hitbox hitbox_test(point3 position) const noexcept override;
    [[nodiscard]] bool accepts_keyboard_focus(keyboard_focus_group group) const noexcept override;
    [[nodiscard]] color focus_color() const noexcept override;
private:
    weak_or_unique_ptr<delegate_type> _delegate;
    notifier<>::token_type _delegate_cbt;
 
    std::unique_ptr<scroll_widget<axis::none, false>> _scroll_widget;
 
    text_widget *_text_widget = nullptr;
 
 
    observable<gstring> _text;
 
    aarectangle _box_rectangle;
 
    aarectangle _text_rectangle;
    widget_constraints _text_constraints;
 
    observable<label> _error_label;
    aarectangle _error_label_rectangle;
    widget_constraints _error_label_constraints;
    std::unique_ptr<label_widget> _error_label_widget;
 
    typename decltype(continues)::token_type _continues_cbt;
    typename decltype(text_style)::token_type _text_style_cbt;
    typename decltype(_text)::token_type _text_cbt;
    typename decltype(_error_label)::token_type _error_label_cbt;
 
    text_field_widget(gui_window &window, widget *parent, weak_or_unique_ptr<delegate_type> delegate) noexcept;
    void revert(bool force) noexcept;
    void commit(bool force) noexcept;
    void draw_background_box(draw_context const &context) const noexcept;
};
 
} // namespace hi::inline v1