# Copyright (c) 1996 CNRI.

# This improves over Java's Blink demo by having a font parameter.

from Tkinter import *
import string
from whrandom import random

# I hate blinking things.
# --Guido van Rossum

FONT = "-*-times-medium-r-normal-*-*-180-*-*-*-*-*-*"
LBL = "The quick brown fox jumps over the lazy dog"

class Blink:

    def __init__(self, master, width=0, height=0,
		 lbl=LBL, speed=2.5, font=FONT):
	self.speed = int(1000/speed)
	# (Hack for b/w compatibility)
	if width and height:
	    # Old Grail <app> tag: width, height passed to widget
	    self.frame = Frame(master, width=width, height=height)
	    self.frame.pack()
	else:
	    # New Grail <applet> tag: width, height set parent size
	    self.frame = master
	    width = string.atoi(master['width'])
	    height = string.atoi(master['height'])
	# Get some font metrics by measuring a dummy widget
	label = Label(self.frame, text=" ", font=font, padx=0, pady=0)
	space, line = label.winfo_reqwidth(), label.winfo_reqheight()
	label.destroy()
	x, y = 0, 0
	self.labels = []
	for word in string.split(lbl):
	    label = Label(self.frame, text=word, font=font, padx=0, pady=0)
	    w, h = label.winfo_reqwidth() + space, label.winfo_reqheight()
	    if x + w > width:
		x, y = 0, y + line
	    label.place(x=x, y=y)
	    self.labels.append(label)
	    x = x + w
	self.blinker()

    def blinker(self):
	# Hack to test if we still exist
	try: self.frame['width']
	except: return
	red = int(random()*50)
	green = int(random()*50)
	blue = int(random()*256)
	for label in self.labels:
	    if random() < 0.5:
		x, y = label.winfo_x(), label.winfo_y()
		label['foreground'] = "#%02x%02x%02x" % (
		    (red + y*30) % 256, (green + x/3) % 256, blue)
	    else:
		label['foreground'] = label['background']
	self.frame.after(self.speed, self.blinker)

if __name__ == '__main__':		# For stand-alone usage
    root = Tk()
    blink = Blink(root)
    root.mainloop()