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Disable chart scaling

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I try to disable chart scrolling and scaling by the ChartSetInteger function with the property CHART_KEYBOARD_CONTROL (in MT4). Disabling scrolling is successful in this way, but unfortunately scaling cannot be disabled in this way. Every time you press "+" or "-" on the numeric keypad, the chart will scale undesirably. Is there any solution? I tried to remember the current scale when pressing "+" or "-", and then set this scale back. Unfortunately, it is not possible to do this immediately after pressing the keys, and one has to wait for the scale changing before undoing it. This, of course, results in a very ugly flickering of the graph.
If anyone has a better solution I would be very grateful for sharing.

Since no one's responding, I did some research myself. So far the best solution is to handle this problem in the OnChartEvent function. This solution does not cause annoying chart "flickering" (at least in most cases).

#define ON_SCALE_CHANGE (97)

void OnChartEvent(const int id,const long& lparam,const double& dparam,const string& sparam)
  {
   long
      scale;
   // Handle custom chart event ON_SCALE_CHANGE
   if(id==(ON_SCALE_CHANGE+CHARTEVENT_CUSTOM))
      // if the scale hasn't changed yet
      if((scale=ChartGetInteger(ChartID(),CHART_SCALE))==lparam)
         EventChartCustom(ChartID(),ON_SCALE_CHANGE,scale,0.0,"");
      // reset the chart scale
      else
         ChartSetInteger(ChartID(),CHART_SCALE,lparam);
   // keydown "+" (on numeric keyboard)
   if(id==CHARTEVENT_KEYDOWN && lparam==107)
      EventChartCustom(ChartID(),ON_SCALE_CHANGE,ChartGetInteger(ChartID(),CHART_SCALE),0.0,"");
   // keydown "-" (on numeric keyboard)
   if(id==CHARTEVENT_KEYDOWN && lparam==109)
      EventChartCustom(ChartID(),ON_SCALE_CHANGE,ChartGetInteger(ChartID(),CHART_SCALE),0.0,"");
  }

#undef ON_SCALE_CHANGE

If anyone has a more elegant solution, it would be great if you would share it.

Petr Nosek #:

Since no one's responding, I did some research myself. So far the best solution is to handle this problem in the OnChartEvent function. This solution does not cause annoying chart "flickering" (at least in most cases).

If anyone has a more elegant solution, it would be great if you would share it.

The more elegant solution is to use a modern software, try MT5
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