extension/src/openvic-extension/classes/GUIListBox.hpp


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#pragma once

#include <godot_cpp/classes/container.hpp>

#include <openvic-simulation/interface/GUI.hpp>

#include "openvic-extension/classes/GUIScrollbar.hpp"

namespace OpenVic {
   class GUIListBox : public godot::Container {
      GDCLASS(GUIListBox, godot::Container)

      GUI::ListBox const* PROPERTY(gui_listbox);

      GUIScrollbar* scrollbar;

      /* The children_data index of the topmost visible child element. */
      int32_t PROPERTY(scroll_index);
      int32_t PROPERTY(max_scroll_index);

      bool PROPERTY_CUSTOM_PREFIX(fixed, is);
      int32_t PROPERTY(fixed_item_count);
      int32_t PROPERTY(fixed_visible_items);
      real_t PROPERTY(fixed_item_height);

      static godot::StringName const& _signal_scroll_index_changed();

      godot::Error _calculate_max_scroll_index(bool signal);
      godot::Error _update_child_positions();

   protected:
      static void _bind_methods();

      void _notification(int what);

   public:
      GUIListBox();

      godot::Vector2 _get_minimum_size() const override;
      void _gui_input(godot::Ref<godot::InputEvent> const& event) override;

      /* Reset gui_listbox to nullptr, and remove all child elements. */
      void clear();

      /* Remove child elements until there are remaining_child_count left excluding the scrollbar. */
      void clear_children(int32_t remaining_child_count = 0);

      void set_scroll_index(int32_t new_scroll_index, bool signal = true);

      godot::Error set_fixed(int32_t item_count, real_t item_height, bool signal = true);
      godot::Error unset_fixed(bool signal = true);

      /* Set the GUI::ListBox. This does not affect any existing child elements. */
      godot::Error set_gui_listbox(GUI::ListBox const* new_gui_listbox);

      /* Return the name of the GUI::ListBox, or an empty String if it's null. */
      godot::String get_gui_listbox_name() const;

      GUIScrollbar* get_scrollbar() const;
   };
}