MQLArticles/Utils/Objects/AutoDel.mqh

//+------------------------------------------------------------------+
//|                                                      AutoDel.mqh |
//|                                  Copyright 2026, Niquel Mendoza. |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2026, Niquel Mendoza."
#property link      "https://www.mql5.com"
#property strict

#ifndef MQLARTICLES_UTILS_OBJECTS_AUTODEL_MQH
#define MQLARTICLES_UTILS_OBJECTS_AUTODEL_MQH

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
#include "Native\\Imp.mqh"

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
namespace TSN
{
//+------------------------------------------------------------------+
//| Structure that stores a group of graphic objects to be deleted   |
//| at a specific time                                               |
//+------------------------------------------------------------------+
struct GraphicObjEliminations
 {
  // Array with the names of the objects that will be deleted when the current time is greater than "time_to_delete"
  string             m_object_names[];

  // Time at which the objects will be deleted
  datetime           time_to_delete;
 };


//+------------------------------------------------------------------+
//| Class to manage the scheduled deletion of graphic objects        |
//| from a specified chart                                           |
//+------------------------------------------------------------------+
class CGraphicObjEliminations
 {
private:
  //--- Internal variables
  GraphicObjEliminations  m_eliminations[];  // Array of deletions
  int                m_indexes_to_remove[];  // Indexes to remove from the deletions array
  int                m_last_element_index;   // Variable that stores the "position" of the last added element
  int                m_current_object_index; // Variable that stores the "position" of the last string added to the last added element


  //--- Parameters
  long               m_chart_id;             // ID of the chart where the objects to be deleted should be found
  int                m_reserve_delete_array; // Reserve for the deletions array 'm_indexes_to_remove'
  int                m_reserve_main_array;   // Reserve for the main array 'm_eliminations'
  int                m_reserve_string_array; // Reserve for the string array of the last element added to the m_eliminations array



public:
                     CGraphicObjEliminations(void);
  //--- Initialization
  void               Initilialize(long chart_id, int reserve_arr_delete, int reserve_main_arr, int reserve_str_arr);

  //--- Add a new set of names to delete
  void               InitAddElement(datetime time_to_delete);
  inline void        AddElement(const string& object_name);

  //--- General functions
  inline void        DeleteAll();
  inline void        HideAll();
  inline void        ShowAll();

  //--- General setters and getters
  // Chart id
  long               ChartId() const { return m_chart_id; }
  void               ChartId(long new_value) { m_chart_id = new_value; }

  // Reserve for the string "array" of the last element added to the deletions array
  int                ElementStrArrayReserve() const { return m_reserve_string_array; }
  void               ElementStrArrayReserve(int new_value) { m_reserve_string_array = new_value; }

  //--- Main function to check if graphic objects should be deleted
  void               OnNewBar(datetime curr_time);
 };

//+------------------------------------------------------------------+
//| Constructor                                                      |
//+------------------------------------------------------------------+
CGraphicObjEliminations::CGraphicObjEliminations(void)
  : m_reserve_delete_array(0), m_reserve_main_array(0), m_reserve_string_array(0),
    m_chart_id(0), m_last_element_index(0), m_current_object_index(0)
 {

 }

//+------------------------------------------------------------------+
//| Initialization function                                          |
//+------------------------------------------------------------------+
void CGraphicObjEliminations::Initilialize(long chart_id, int reserve_arr_delete, int reserve_main_arr, int reserve_str_arr)
 {
  m_chart_id = chart_id;
  m_reserve_delete_array = reserve_arr_delete;
  m_reserve_main_array = reserve_main_arr;
  m_reserve_string_array = reserve_str_arr;
 }

//+------------------------------------------------------------------+
//| Function to add a new group of graphic objects                   |
//| that will be deleted at a specified time.                        |
//+------------------------------------------------------------------+
void CGraphicObjEliminations::InitAddElement(datetime time_to_delete)
 {
  m_last_element_index = ArraySize(m_eliminations);
  m_current_object_index = 0;

  ArrayResize(m_eliminations, m_last_element_index + 1, m_reserve_main_array);
  m_eliminations[m_last_element_index].m_object_names.Reserve(m_reserve_string_array);
  m_eliminations[m_last_element_index].time_to_delete = time_to_delete;

 }

//+----------------------------------------------------------------------+
//| Function to add a new object name to the last added set-element.     |
//+----------------------------------------------------------------------+
void CGraphicObjEliminations::AddElement(const string& object_name)
 {
  ArrayResize(m_eliminations[m_last_element_index].m_object_names, m_current_object_index + 1, m_reserve_string_array);
  m_eliminations[m_last_element_index].m_object_names[m_current_object_index] = object_name;
  m_current_object_index++;
 }


//+------------------------------------------------------------------+
//| Deletes all stored graphic objects, and also                     |
//| resizes the main array to 0                                      |
//+------------------------------------------------------------------+
inline void CGraphicObjEliminations::DeleteAll(void)
 {
  for(int i = 0; i < ArraySize(m_eliminations); i++)
    for(int j = 0; j < ArraySize(m_eliminations[i].m_object_names); j++)
      ObjectDelete(m_chart_id, m_eliminations[i].m_object_names[j]);

  ArrayResize(m_eliminations, 0, m_reserve_main_array);
 }


//+------------------------------------------------------------------+
//| Hides all stored graphic objects                                 |
//+------------------------------------------------------------------+
inline void CGraphicObjEliminations::HideAll(void)
 {
  for(int i = 0; i < ArraySize(m_eliminations); i++)
    for(int j = 0; j < ArraySize(m_eliminations[i].m_object_names); j++)
      HIDE_OBJECT(m_eliminations[i].m_object_names[j], m_chart_id);
 }

//+------------------------------------------------------------------+
//| Shows all stored graphic objects                                 |
//+------------------------------------------------------------------+
inline void CGraphicObjEliminations::ShowAll(void)
 {
  for(int i = 0; i < ArraySize(m_eliminations); i++)
    for(int j = 0; j < ArraySize(m_eliminations[i].m_object_names); j++)
      SHOW_OBJECT(m_eliminations[i].m_object_names[j], m_chart_id);
 }


//+----------------------------------------------------------------------+
//| Main function in which we check which elements of the deletions      |
//| array are ready to be deleted both from the array and graphically    |
//| from the chart with ObjectDelete                                     |
//+----------------------------------------------------------------------+
void CGraphicObjEliminations::OnNewBar(datetime curr_time)
 {
//--- Initial
  const int total_eliminations = ArraySize(m_eliminations);
  ArrayResize(m_indexes_to_remove, 0, m_reserve_delete_array);
  int remove_index_count = 0;

//--- Review
  for(int i = 0; i < total_eliminations; i++) // From oldest to newest
   {
    if(m_eliminations[i].time_to_delete < curr_time)
     {
      //--- Delete
      for(int j = 0; j < ArraySize(m_eliminations[i].m_object_names); j++)
        ObjectDelete(m_chart_id, m_eliminations[i].m_object_names[j]);

      //--- Mark
      ArrayResize(m_indexes_to_remove, remove_index_count + 1, m_reserve_delete_array);
      m_indexes_to_remove[remove_index_count] = i;
      remove_index_count++;
     }
   }

//--- Delete
  RemoveMultipleIndexes(m_eliminations, m_indexes_to_remove, m_reserve_main_array);
 }


//---
}

#endif // MQLARTICLES_UTILS_OBJECTS_AUTODEL_MQH