momentary_button_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"
#include "../macros.hpp"
 
namespace hi { inline namespace v1 {
 
class momentary_button_widget final : public abstract_button_widget {
public:
    using super = abstract_button_widget;
    using delegate_type = typename super::delegate_type;
 
    momentary_button_widget(
        widget *parent,
        std::shared_ptr<delegate_type> delegate,
        button_widget_attribute auto&&...attributes) noexcept :
        super(parent, std::move(delegate))
    {
        alignment = alignment::middle_center();
        set_attributes<0>(hi_forward(attributes)...);
    }
 
    momentary_button_widget(widget *parent, button_widget_attribute auto&&...attributes) noexcept :
        momentary_button_widget(parent, std::make_shared<delegate_type>(), hi_forward(attributes)...)
    {
    }
 
    [[nodiscard]] box_constraints update_constraints() noexcept override
    {
        _label_constraints = super::update_constraints();
 
        // On left side a check mark, on right side short-cut. Around the label extra margin.
        hilet extra_size = extent2{theme().margin<float>() * 2.0f, theme().margin<float>() * 2.0f};
 
        auto constraints = _label_constraints + extra_size;
        constraints.margins = theme().margin();
        return constraints;
    }
    void set_layout(widget_layout const& context) noexcept override
    {
        if (compare_store(_layout, context)) {
            hilet label_rectangle =
                aarectangle{theme().margin<float>(), 0.0f, context.width() - theme().margin<float>() * 2.0f, context.height()};
            _on_label_shape = _off_label_shape = _other_label_shape =
                box_shape{_label_constraints, label_rectangle, theme().baseline_adjustment()};
        }
        super::set_layout(context);
    }
    void draw(draw_context const& context) noexcept override
    {
        if (*mode > widget_mode::invisible and overlaps(context, layout())) {
            draw_label_button(context);
            draw_button(context);
        }
    }
private:
    box_constraints _label_constraints;
 
    void draw_label_button(draw_context const& context) noexcept
    {
        // Move the border of the button in the middle of a pixel.
        context.draw_box(
            layout(),
            layout().rectangle(),
            background_color(),
            focus_color(),
            theme().border_width(),
            border_side::inside,
            theme().rounding_radius());
    }
};
 
}} // namespace hi::v1