concertina_panel.hpp

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#pragma once
 
// ConcertinaPanel — accordion-style collapsible panel stack.
// Each section has a header that can be clicked to expand/collapse.
 
#include <pulp/view/view.hpp>
#include <string>
#include <vector>
#include <memory>
#include <functional>
 
namespace pulp::view {
 
class ConcertinaPanel : public View {
public:
    ConcertinaPanel() = default;

    void add_section(std::string title, std::unique_ptr<View> content,
                     bool initially_expanded = false);

    void expand(int index);

    void collapse(int index);

    void toggle(int index);

    bool is_expanded(int index) const;

    int section_count() const { return static_cast<int>(sections_.size()); }

    void set_header_height(float h) { header_height_ = h; }
    float header_height() const { return header_height_; }

    void set_exclusive(bool e) { exclusive_ = e; }
    bool is_exclusive() const { return exclusive_; }
 
    void paint(canvas::Canvas& canvas) override;
    void on_mouse_down(Point pos) override;
    bool wants_mouse_input() const override { return true; }

    void layout_sections();
 
private:
    struct Section {
        std::string title;
        std::unique_ptr<View> content;
        bool expanded = false;
    };
 
    std::vector<Section> sections_;
    float header_height_ = 30.0f;
    bool exclusive_ = false;
};
 
}  // namespace pulp::view