Python Help - Splash Screen

[Brian Kelley]

I stole this a while ago from the following post from 
quickdry at users.sourceforge.net deja reference 
http://groups.google.com/groups?q=tkinter+using+pil&hl=en&selm=3bf9d934%240%2410227%24afc38c87%40news.optusnet.com.au&rnum=1

I modified it to add PIL support for loading images.  It shows a splash 
screen with an image (jpg, gif and others that PIL supports) for a 
specified number of milliseconds, then it closes and the main window 
pops up.  You will need to have PIL installed 
http://www.pythonware.com/products/pil/
You'll have to supply your own "python.jpg" file to test :)

"""SplashScreen
A splash screen that displays an image for a predefined
number of milliseconds.

usage
tk = Tk()
s = SplashScreen(tk, timeout=2000, image="python.jpg")
mainloop()

The main window will be shown after the timeout.

requires: PIL imaging library
"""

from Tkinter import *
try:
     from PIL import Image, ImageTk
except ImportError:
     import Image, ImageTk

class SplashScreen(Toplevel):
     def __init__(self, master, image=None, timeout=1000):
         """(master, image, timeout=1000) -> create a splash screen
         from specified image file.  Keep splashscreen up for timeout
         milliseconds"""
         Toplevel.__init__(self, master, relief=RAISED, borderwidth=5)
         self.main = master
         if self.main.master != None: # Why ?
             self.main.master.withdraw()
         self.main.withdraw()
         self.overrideredirect(1)
         im = Image.open(image)
         self.image = ImageTk.PhotoImage(im)
         self.after_idle(self.centerOnScreen)

         self.update()
         self.after(timeout, self.destroy)

     def centerOnScreen(self):
         self.update_idletasks()
         width, height = self.width, self.height = \
                         self.image.width(), self.image.height()

         xmax = self.winfo_screenwidth()
         ymax = self.winfo_screenheight()

         x0 = self.x0 = (xmax - self.winfo_reqwidth()) / 2 - width/2
         y0 = self.y0 = (ymax - self.winfo_reqheight()) / 2 - height/2
         self.geometry("+%d+%d" % (x0, y0))
         self.createWidgets()

     def createWidgets(self):
	# Need to fill in here
         self.canvas = Canvas(self, height=self.width, width=self.height)
         self.canvas.create_image(0,0, anchor=NW, image=self.image)
         self.canvas.pack()

     def destroy(self):
         self.main.update()
         self.main.deiconify()
         self.withdraw()

if __name__ == "__main__":
     import os
     tk = Tk()
     l = Label(tk, text="main window")
     l.pack()

     assert os.path.exists("python.jpg")
     s = SplashScreen(tk, timeout=2000, image="python.jpg")
     mainloop()