seteventhandler

seteventhandler — set an event handler for the current graphic window

Calling sequence

seteventhandler(sfun_name)   
seteventhandler('')

Parameters

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.

The event handler is defined by a Scilab function whose calling sequence must be function sfun_name(win,x,y,ibut), where

win represents the number of the window where the event had occured.

x,y are the coordinates of the pointer (in pixels), when the event has occured

ibutis the event type:

`ibut==0`	: Left mouse button has been pressed
`ibut==-5`	: Left mouse button has been released
`ibut==1`	: Middle mouse button has been pressed
`ibut==-4`	: Middle mouse button has been released
`ibut==2`	: Right mouse button has been pressed
`ibut==-3`	: Right mouse button has been released
`ibut==-1`	: pointer has moved
`ibut > =32`	: key with ascii code ascii(ibut) has been pressed
`ibut < =-32`	: key with ascii code ascii(-ibut) has been released
`ibut==-1000`	: graphic window has been closed

Examples



   function my_eventhandler(win,x,y,ibut)
       if ibut==-1 then 
         [x,y]=xchange(x,y,'i2f')
         xinfo('Mouse position is ('+string(x)+','+string(y)+')')
       end
   endfunction
   plot2d()
   seteventhandler('my_eventhandler')
   //now move the mouse over the graphic window/
   seteventhandler('') //suppress the event handler