toolbar_tab_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"
 
namespace hi { inline namespace v1 {
 
class toolbar_tab_button_widget final : public abstract_button_widget {
public:
    using super = abstract_button_widget;
    using delegate_type = typename super::delegate_type;
 
    toolbar_tab_button_widget(
        widget *parent,
        std::shared_ptr<delegate_type> delegate,
        button_widget_attribute auto&&...attributes) noexcept :
        super(parent, std::move(delegate))
    {
        alignment = alignment::top_center();
        set_attributes<0>(hi_forward(attributes)...);
    }
 
    template<
        different_from<std::shared_ptr<delegate_type>> Value,
        forward_of<observer<observer_decay_t<Value>>> OnValue,
        button_widget_attribute... Attributes>
    toolbar_tab_button_widget(
        widget *parent,
        Value&& value,
        OnValue&& on_value,
        Attributes&&...attributes) noexcept
        requires requires { make_default_radio_button_delegate(hi_forward(value), hi_forward(on_value)); }
        :
        toolbar_tab_button_widget(
            parent,
            make_default_radio_button_delegate(hi_forward(value), hi_forward(on_value)),
            hi_forward(attributes)...)
    {
    }
 
    void request_redraw() const noexcept override
    {
        // A toolbar tab button draws a focus line across the whole toolbar
        // which is beyond it's own clipping rectangle. The parent is the toolbar
        // so it will include everything that needs to be redrawn.
        if (parent != nullptr) {
            parent->request_redraw();
        } else {
            super::request_redraw();
        }
    }
 
    [[nodiscard]] box_constraints update_constraints() noexcept override;
    void set_layout(widget_layout const& context) noexcept override;
    void draw(draw_context const& context) noexcept override;
    [[nodiscard]] bool accepts_keyboard_focus(keyboard_focus_group group) const noexcept override;
    // @endprivatesection
private:
    box_constraints _label_constraints;
 
    void draw_toolbar_tab_button(draw_context const& context) noexcept;
};
 
}} // namespace hi::v1