spk_tab_widget.hpp

#pragma once
 
#include <cstddef>
#include <memory>
#include <optional>
#include <string>
#include <vector>
 
#include "structure/widget/spk_command_panel.hpp"
#include "structure/widget/spk_linear_layout.hpp"
#include "structure/widget/spk_push_button.hpp"
#include "structure/widget/spk_widget.hpp"
 
namespace spk
{
    class TabWidget : public spk::Widget
    {
    private:
        struct Tab
        {
            spk::PushButton *button;
            std::unique_ptr<spk::Widget> content;
            spk::PushButton::Contract contract;
        };
 
        spk::CommandPanel _tabBar;
        spk::Widget _contentContainer;
        spk::VerticalLayout _layout;
        std::vector<Tab> _tabs;
        std::optional<size_t> _activeIndex;
        spk::Vector2UInt _tabCornerSize{4, 4};
 
        void _refreshContentGeometry();
        void _refreshSizeHints();
        void _addTab(const std::wstring &p_label, std::unique_ptr<spk::Widget> p_content);
 
        spk::Vector2UInt _activeContentMinimal() const;
        spk::Vector2UInt _activeContentDesired() const;
        spk::Vector2UInt _activeContentMaximal() const;
        spk::Vector2UInt _maxContentMinimal() const;
        spk::Vector2UInt _maxContentDesired() const;
        spk::Vector2UInt _maxContentMaximal() const;
 
    protected:
        void _onGeometryChange() override;
 
    public:
        TabWidget(const std::wstring &p_name, spk::Widget *p_parent);
 
        template <typename TContent, typename... TArgs>
        TContent &addTab(const std::wstring &p_label, const std::wstring &p_contentName, TArgs &&...p_args)
        {
            auto content = std::make_unique<TContent>(p_contentName, &_contentContainer, std::forward<TArgs>(p_args)...);
            TContent &contentRef = *content;
            _addTab(p_label, std::move(content));
            return contentRef;
        }

        void addTab(const std::wstring &p_label, std::unique_ptr<spk::Widget> p_content);
        void setActiveIndex(size_t p_index);
        std::optional<size_t> activeIndex() const;
        size_t tabCount() const;

        void setTabAlignment(spk::HorizontalAlignment p_alignment);
        spk::HorizontalAlignment tabAlignment() const;
    };
}