MQL5 ObjectCreate & OnChartEvent Guide: UI Buttons & Event Handling

//+------------------------------------------------------------------+
//|                                     ChartObjectsEventsGuideEA.mq5|
//|                             Copyright 2026, Pineify Guides Series |
//|                                              https://pineify.app |
//+------------------------------------------------------------------+
#property copyright "Pineify Guides Series"
#property link      "https://pineify.app/mql5/chart-objects-events-guide"
#property version   "1.00"
#property strict

#include <Trade/Trade.mqh>

#define PREFIX "PineifyUI_"

CTrade g_trade;
input bool AllowDemoOrders=false; // UI demo logs clicks unless explicitly enabled.
const ulong DemoMagic=998877;

//+------------------------------------------------------------------+
//| Helper: Create a chart button with pixel positioning             |
//+------------------------------------------------------------------+
bool CreateButton(const string name, const string text,
                  const int x, const int y,
                  const int width, const int height,
                  const color bgCol, const color textCol)
  {
   // Check if object already exists to avoid redundant creation
   if(ObjectFind(0, name) >= 0)
      return true;

   if(!ObjectCreate(0, name, OBJ_BUTTON, 0, 0, 0))
     {
      PrintFormat("Failed to create button %s! Error: %d", name, GetLastError());
      return false;
     }

   // Anchor to top-left corner using pixel coordinates
   ObjectSetInteger(0, name, OBJPROP_CORNER, CORNER_LEFT_UPPER);
   ObjectSetInteger(0, name, OBJPROP_XDISTANCE, x);
   ObjectSetInteger(0, name, OBJPROP_YDISTANCE, y);
   ObjectSetInteger(0, name, OBJPROP_XSIZE, width);
   ObjectSetInteger(0, name, OBJPROP_YSIZE, height);

   // Styling
   ObjectSetString(0, name, OBJPROP_TEXT, text);
   ObjectSetString(0, name, OBJPROP_FONT, "Segoe UI");
   ObjectSetInteger(0, name, OBJPROP_FONTSIZE, 10);
   ObjectSetInteger(0, name, OBJPROP_COLOR, textCol);
   ObjectSetInteger(0, name, OBJPROP_BGCOLOR, bgCol);
   ObjectSetInteger(0, name, OBJPROP_BORDER_COLOR, clrDarkGray);
   ObjectSetInteger(0, name, OBJPROP_SELECTABLE, false);
   ObjectSetInteger(0, name, OBJPROP_STATE, false);

   return ObjectFind(0,name)>=0;
  }

//+------------------------------------------------------------------+
//| Expert initialization function                                   |
//+------------------------------------------------------------------+
int OnInit()
  {
   g_trade.SetExpertMagicNumber(DemoMagic);
   g_trade.SetTypeFillingBySymbol(_Symbol);

   // Create UI buttons
   if(!CreateButton(PREFIX + "BuyBtn", "DEMO BUY", 20, 40, 110, 36, clrDodgerBlue, clrWhite)) return INIT_FAILED;
   if(!CreateButton(PREFIX + "CloseBtn", "CLOSE OWN", 140, 40, 110, 36, clrCrimson, clrWhite)) return INIT_FAILED;

   // Refresh chart to display objects immediately
   ChartRedraw(0);

   Print("Chart objects UI created successfully.");
   return(INIT_SUCCEEDED);
  }

//+------------------------------------------------------------------+
//| Expert deinitialization function                                 |
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
  {
   // Delete all graphical objects matching program prefix
   int deleted = ObjectsDeleteAll(0, PREFIX);
   ChartRedraw(0);

   PrintFormat("Removed %d UI chart objects. Reason: %d", deleted, reason);
  }

//+------------------------------------------------------------------+
//| Chart event handler                                              |
//+------------------------------------------------------------------+
void OnChartEvent(const int id,
                  const long &lparam,
                  const double &dparam,
                  const string &sparam)
  {
   // Filter for object click events
   if(id == CHARTEVENT_OBJECT_CLICK)
     {
      if(!AllowDemoOrders || AccountInfoInteger(ACCOUNT_TRADE_MODE)!=ACCOUNT_TRADE_MODE_DEMO)
        {
         Print("UI demonstration click: ",sparam,"; no order sent.");
         ObjectSetInteger(0,sparam,OBJPROP_STATE,false);
         ChartRedraw(0);
         return;
        }
      // Handle BUY button click
      if(sparam == PREFIX + "BuyBtn")
        {
         Print("User clicked BUY button.");
         double ask = SymbolInfoDouble(_Symbol, SYMBOL_ASK);
         if(!g_trade.Buy(0.10, _Symbol, ask, 0, 0, "Pineify Button Click") ||
            g_trade.ResultRetcode()!=TRADE_RETCODE_DONE)
            Print("Buy result: ",g_trade.ResultRetcode()," ",g_trade.ResultRetcodeDescription());

         // Reset button pressed state
         ObjectSetInteger(0, sparam, OBJPROP_STATE, false);
         ChartRedraw(0);
        }
      // Handle CLOSE ALL button click
      else if(sparam == PREFIX + "CloseBtn")
        {
         Print("User clicked CLOSE ALL button.");
         // Close all positions matching this symbol
         for(int i = PositionsTotal() - 1; i >= 0; i--)
           {
            ulong ticket = PositionGetTicket(i);
            if(ticket>0 && PositionGetString(POSITION_SYMBOL) == _Symbol &&
               PositionGetInteger(POSITION_MAGIC)==(long)DemoMagic)
               if(!g_trade.PositionClose(ticket) || g_trade.ResultRetcode()!=TRADE_RETCODE_DONE)
                  Print("Close result: ",g_trade.ResultRetcode());
           }

         // Reset button pressed state
         ObjectSetInteger(0, sparam, OBJPROP_STATE, false);
         ChartRedraw(0);
        }
     }
  }

//+------------------------------------------------------------------+
//| Expert tick function                                             |
//+------------------------------------------------------------------+
void OnTick()
  {
   // Events for this EA are processed sequentially; keep handlers short.
  }