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MQL5 ReferenceStandard LibraryPanels and DialogsCWndContainerOnMouseEvent 

OnMouseEvent

Mouse event handler.

virtual bool  OnMouseEvent(
   const int  x,         // x coordinate
   const int  y,         // y coordinate
   const int  flags      // flags
   )

Parameters

x

[in]  X coordinate of the mouse cursor relative to the upper-left corner of the chart.

y

[in]  Y coordinate of the mouse cursor relative to the upper-left corner of the chart.

flags

[in]  Flag of mouse buttons states.

Return Value

true - event processed, otherwise - false.