from cs1graphics import *

class KeyboardHandler(EventHandler):
    def __init__(self,textObj):
        EventHandler.__init__(self)
        self._text=textObj

    def handle(self,event):
        if event.getDescription() == 'keyboard':
            self._text.setMessage(self._text.getMessage() + event.getKey())
        elif event.getDescription() == 'mouse click':
            self._text.setMessage('')

def main():
    paper=Canvas(700,600,'light yellow','Echoing characters in the graphics window')

    text=Text('',12,Point(350,300))

    paper.add(text)
    echo=KeyboardHandler(text)
    paper.addHandler(echo)

main()