seteventhandler set an event handler for the current graphic window

## Syntax

    seteventhandler(sfun_name)
                seteventhandler('')

## Arguments

sfun_name

  a character string. The name of the Scilab function which is intended to handle the events

## Description

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.

## Examples

    function my_eventhandler(win,x,y,ibut)
      if ibut==-1000 then return,end
      [x,y]=xchange(x,y,'i2f')
      gcf().info_message = 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

## See also

- addmenu
- xgetmouse
- xclick
- xchange
- event handler functions
- figure_properties