toggle_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 "abstract_button_widget.hpp"
#include "default_button_delegate.hpp"
 
namespace tt {
 
class toggle_widget final : public abstract_button_widget {
public:
    using super = abstract_button_widget;
    using delegate_type = typename super::delegate_type;
    using callback_ptr_type = typename delegate_type::callback_ptr_type;
 
    toggle_widget(gui_window &window, widget *parent, std::unique_ptr<delegate_type> delegate) noexcept;
 
    template<typename Value, typename... Args>
    toggle_widget(gui_window &window, widget *parent, Value &&value, Args &&...args) noexcept
        requires(not std::is_convertible_v<Value, weak_or_unique_ptr<delegate_type>>) :
        toggle_widget(
            window,
            parent,
            make_unique_default_button_delegate<button_type::toggle>(std::forward<Value>(value), std::forward<Args>(args)...))
    {
    }
 
    [[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:
    static constexpr std::chrono::nanoseconds _animation_duration = std::chrono::milliseconds(150);
 
    extent2 _button_size;
    aarectangle _button_rectangle;
    animator<float> _animated_value = _animation_duration;
    aarectangle _pip_rectangle;
    float _pip_move_range;
 
    toggle_widget(gui_window &window, widget *parent, weak_or_unique_ptr<delegate_type> delegate) noexcept;
    void draw_toggle_button(draw_context context) noexcept;
    void draw_toggle_pip(draw_context draw_context, utc_nanoseconds display_time_point) noexcept;
};
 
} // namespace tt