seteventhandler — set an event handler for the current graphic window
seteventhandler(sfun_name)
seteventhandler('')a character string. The name of the Scilab function which is intended to handle the events
    The function allows the user to set a particular event handler for
    the current graphic window. seteventhandler('') 
    removes the handler.
    
For more information about event handler functions see the event handler functions help.
 
function my_eventhandler(win,x,y,ibut)
  if ibut==-1000 then return,end
  [x,y]=xchange(x,y,'i2f')
  xinfo(msprintf('Event code %d at mouse position is (%f,%f)',ibut,x,y))
endfunction
plot2d()
seteventhandler('my_eventhandler')
//now:
//   -  move the mouse over the graphic window
//   -  press and release keys shifted or not with Ctrl pressed or not
//   -  press button, wait a little release
//   -  press and release button
//   -  double-click button
seteventhandler('') //suppress the event handler