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MQL5 ReferenceStandard LibraryPanels and DialogsCWndContainerOnEvent 

OnEvent

Chart event handler.

virtual bool  OnEvent(
   const int      id,         // ID
   const long&    lparam,     // parameter
   const double&  dparam,     // parameter
   const string&  sparam      // parameter
   )

Parameters

id

[in]  Event ID.

lparam

[in]  Event parameter of long type, passed by reference.

dparam

[in]  Event parameter of double type, passed by reference.

sparam

[in]  Event parameter of string type, passed by reference.

Return Value

true - event processed, otherwise - false.