//

#ifndef _FL_TREE_ITEM_ARRAY_H
#define _FL_TREE_ITEM_ARRAY_H

#include <FL/Fl.H>
#include "Fl_Export.H"

class FL_EXPORT Fl_Tree_Item;   // forward decl must *precede* first doxygen comment block
                                // or doxygen will not document our class..

//////////////////////////
// FL/Fl_Tree_Item_Array.H
//////////////////////////
//
// Fl_Tree -- This file is part of the Fl_Tree widget for FLTK
// Copyright (C) 2009-2010 by Greg Ercolano.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file.  If this
// file is missing or damaged, see the license at:
//
//     https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
//     https://www.fltk.org/bugs.php
//

///
/// \file
/// \brief This file defines a class that manages an array of Fl_Tree_Item pointers.
///

/// \brief Manages an array of Fl_Tree_Item pointers.
///
/// Because FLTK 1.x.x. has mandated that templates and STL not be used,
/// we use this class to dynamically manage the arrays.
///
/// None of the methods do range checking on index values; the caller
/// must be sure that index values are within the range 0<index<total()
/// (unless otherwise noted).
///

class FL_EXPORT Fl_Tree_Item_Array {
  Fl_Tree_Item **_items;        // items array
  int _total;                   // #items in array
  int _size;                    // #items *allocated* for array
  int _chunksize;               // #items to enlarge mem allocation
  enum {
    MANAGE_ITEM = 1             ///> manage the Fl_Tree_Item's internals (internal use only)
  };
  char _flags;                  // flags to control behavior
  void enlarge(int count);
public:
  Fl_Tree_Item_Array(int new_chunksize = 10);           // CTOR
  ~Fl_Tree_Item_Array();                                // DTOR
  Fl_Tree_Item_Array(const Fl_Tree_Item_Array *o);      // COPY CTOR
  /// Return the item and index \p i.
  Fl_Tree_Item *operator[](int i) {
    return(_items[i]);
  }
  /// Const version of operator[](int i)
  const Fl_Tree_Item *operator[](int i) const {
    return(_items[i]);
  }
  /// Return the total items in the array, or 0 if empty.
  int total() const {
    return(_total);
  }
  /// Swap the two items at index positions \p ax and \p bx.
  void swap(int ax, int bx);
  int move(int to, int from);
  int deparent(int pos);
  int reparent(Fl_Tree_Item *item, Fl_Tree_Item *newparent, int pos);
  void clear();
  void add(Fl_Tree_Item *val);
  void insert(int pos, Fl_Tree_Item *new_item);
  void replace(int pos, Fl_Tree_Item *new_item);
  void remove(int index);
  int  remove(Fl_Tree_Item *item);
  /// Option to control if Fl_Tree_Item_Array's destructor will also destroy the Fl_Tree_Item's.
  /// If set: items and item array is destroyed.
  /// If clear: only the item array is destroyed, not items themselves.
  void manage_item_destroy(int val) {
    if ( val ) _flags |= MANAGE_ITEM; else _flags &= ~MANAGE_ITEM;
  }
  int manage_item_destroy() const {
    return _flags & MANAGE_ITEM ? 1 : 0;
  }
};

#endif /*_FL_TREE_ITEM_ARRAY_H*/