#pragma once

namespace roro {

// Selection and scrolling for a vertical list showing `visibleRows` rows at a time.
// Up/Down wrap around; page moves don't.
class ListModel {
   public:
    explicit ListModel(int visibleRows) : rows_(visibleRows) {}

    void setCount(int count);
    int count() const { return count_; }
    int selected() const { return selected_; }  // -1 when empty
    int firstVisible() const { return first_; }
    int visibleRows() const { return rows_; }

    void select(int index);
    void up();
    void down();
    void pageUp();
    void pageDown();

   private:
    void scrollToSelection();

    int rows_;
    int count_ = 0;
    int selected_ = -1;
    int first_ = 0;
};

}  // namespace roro