toggle_widget.hpp

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// Copyright Take Vos 2021-2022.
// 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"
 
namespace hi { inline namespace v1 {
 
class toggle_widget final : public abstract_button_widget {
public:
    using super = abstract_button_widget;
    using delegate_type = typename super::delegate_type;
 
    toggle_widget(
        widget *parent,
        std::shared_ptr<delegate_type> delegate,
        button_widget_attribute auto&&...attributes) noexcept :
        super(parent, std::move(delegate))
    {
        alignment = alignment::top_left();
        set_attributes<0>(hi_forward(attributes)...);
    }
 
    template<different_from<std::shared_ptr<delegate_type>> Value, button_widget_attribute... Attributes>
    toggle_widget(widget *parent, Value&& value, Attributes&&...attributes) noexcept requires requires
    {
        make_default_toggle_button_delegate(hi_forward(value));
    } : toggle_widget(parent, make_default_toggle_button_delegate(hi_forward(value)), hi_forward(attributes)...) {}
 
    template<
        different_from<std::shared_ptr<delegate_type>> Value,
        forward_of<observer<observer_decay_t<Value>>> OnValue,
        button_widget_attribute... Attributes>
    toggle_widget(widget *parent, Value&& value, OnValue&& on_value, Attributes&&...attributes) noexcept
        requires requires
    {
        make_default_toggle_button_delegate(hi_forward(value), hi_forward(on_value));
    } :
        toggle_widget(
            parent,
            make_default_toggle_button_delegate(hi_forward(value), hi_forward(on_value)),
            hi_forward(attributes)...)
    {
    }
 
    template<
        different_from<std::shared_ptr<delegate_type>> Value,
        forward_of<observer<observer_decay_t<Value>>> OnValue,
        forward_of<observer<observer_decay_t<Value>>> OffValue,
        button_widget_attribute... Attributes>
    toggle_widget(
        widget *parent,
        Value&& value,
        OnValue&& on_value,
        OffValue&& off_value,
        Attributes&&...attributes) noexcept requires requires
    {
        make_default_toggle_button_delegate(hi_forward(value), hi_forward(on_value), hi_forward(off_value));
    } :
        toggle_widget(
            parent,
            make_default_toggle_button_delegate(hi_forward(value), hi_forward(on_value), hi_forward(off_value)),
            hi_forward(attributes)...)
    {
    }
 
    widget_constraints const& set_constraints(set_constraints_context const &context) noexcept override;
    void set_layout(widget_layout const& context) noexcept override;
    void draw(draw_context const& context) 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;
 
    void draw_toggle_button(draw_context const& context) noexcept;
    void draw_toggle_pip(draw_context const& context) noexcept;
};
 
}} // namespace hi::v1