Is it possible to resize an object with a mouse drag?

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Hello everyone,

I don't normally do this, but I'm at a dead end. A little bit about what I'm trying to design. I am in the process of making a new class using CWndContainer as the parent class. The idea is to have an alternative to CDialog/CAppDialog that is more customizable and not as "bulky"...kind of like a widget. As a matter of fact I used the CDialog .mqh file as a starting point. I more or less have most of the features figured out to a point for functional testing, except for one. I would like to integrate the ability to resize this container during a mouse dragging event on the bottom/right corner. I have an object there already to be used for this purpose. I have tried multiple ways to accomplish this, but none have worked out for me.

Disclaimer: I am NOT a master at MQL4. I have just started learning the language a couple of months ago. I understand that trying to make my own Class is usually beyond the expectation for that short amount of time of learning. But, that is how I learn. By challenging myself and forcing myself to figure out problems as I come across them, I retain the information much better. But, I am a quick learner and love to learn new things all the time.

With that being said, I am not looking a "spoon fed" answer. All I am looking for is 1)Is this even possible/has been done before, and 2)if it is possible, a nudge in the right direction in the form of references, forum, articles, etc. that I should look at. And, yes, I have looked at a lot of material on this website and others. I think it is possible, I just can't seem to find the answer. Any insight is greatly appreciated and thank you for your time.

 

Example:

#property strict
#property indicator_chart_window
#include <ChartObjects\ChartObjectsTxtControls.mqh>
#include <ChartObjects\ChartObjectsBmpControls.mqh>
CChartObjectRectLabel rec;
CChartObjectButton btn;
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int OnInit()
  {
//--- indicator buffers mapping
   rec.Create(ChartID(),"rec",0,10,10,200,200);
   btn.Create(ChartID(),"btn",0,205,205,5,5);
   btn.Selectable(true);
   btn.Selected(true);
//---
   return(INIT_SUCCEEDED);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int OnCalculate(const int rates_total,
                const int prev_calculated,
                const datetime &time[],
                const double &open[],
                const double &high[],
                const double &low[],
                const double &close[],
                const long &tick_volume[],
                const long &volume[],
                const int &spread[])
  {
//---
   
//--- return value of prev_calculated for next call
   return(rates_total);
  }
//+------------------------------------------------------------------+
//| ChartEvent function                                              |
//+------------------------------------------------------------------+
void OnChartEvent(const int id,
                  const long &lparam,
                  const double &dparam,
                  const string &sparam)
  {
//---
   if(id==CHARTEVENT_OBJECT_DRAG && sparam=="btn")
     {
      rec.X_Size(rec.X_Distance()+btn.X_Distance()-rec.X_Distance());
      rec.Y_Size(rec.Y_Distance()+btn.Y_Distance()-rec.Y_Distance());
     } 
  }
//+------------------------------------------------------------------+
 
Well then...that is great. I haven't gone through those classes yet, and apparently I need to. Thank you very much for pulling me out of tunnel vision. I might not even need to make a new class to design what I have in mind. Thanks again. 
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