toolbar_widget.hpp

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// Copyright Take Vos 2020-2022.
// 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 "widget.hpp"
#include "grid_layout.hpp"
#include "../alignment.hpp"
#include <memory>
#include <ranges>
 
namespace hi { inline namespace v1 {
 
class toolbar_widget final : public widget {
public:
    using super = widget;
 
    toolbar_widget(gui_window& window, widget *parent) noexcept;
 
    template<typename Widget, horizontal_alignment Alignment = horizontal_alignment::left, typename... Args>
    Widget& make_widget(Args&&...args)
    {
        auto widget = std::make_unique<Widget>(window, this, std::forward<Args>(args)...);
        return static_cast<Widget&>(add_widget(Alignment, std::move(widget)));
    }
 
    [[nodiscard]] generator<widget *> children() const noexcept override
    {
        for (hilet& child : _left_children) {
            co_yield child.get();
        }
        for (hilet& child : std::ranges::reverse_view(_right_children)) {
            co_yield child.get();
        }
    }
 
    widget_constraints const& set_constraints() noexcept;
    void set_layout(widget_layout const& layout) noexcept override;
    void draw(draw_context const& context) noexcept override;
    hitbox hitbox_test(point3 position) const noexcept override;
    [[nodiscard]] color focus_color() const noexcept override;
private:
    std::vector<std::unique_ptr<widget>> _left_children;
    std::vector<std::unique_ptr<widget>> _right_children;
    grid_layout _grid_layout;
    margins _inner_margins;
 
    void update_constraints_for_child(
        widget& child,
        ssize_t index,
        float& shared_height,
        float& shared_top_margin,
        float& shared_bottom_margin,
        widget_baseline& shared_baseline) noexcept;
 
    void update_layout_for_child(widget& child, ssize_t index, widget_layout const& context) const noexcept;
 
    widget& add_widget(horizontal_alignment alignment, std::unique_ptr<widget> widget) noexcept;
 
    bool tab_button_has_focus() const noexcept;
};
 
}} // namespace hi::v1