'''
May 2017
@author: Burkhard A. Meier
'''
from tkinter import Tk, PhotoImage, Label
from itertools import cycle
from os import listdir, path, chdir
class SlideShow(Tk):
# inherit GUI framework extending tkinter
def __init__(self, msShowTimeBetweenSlides=1500):
# initialize tkinter super class
Tk.__init__(self)
# time each slide will be shown
self.showTime = msShowTimeBetweenSlides
# look for images in current working directory where this module lives
# try: .jpeg
chapter_folder = path.realpath(path.dirname(__file__))
resources_folder = path.join(chapter_folder, 'Resources')
listOfSlides = [slide for slide in listdir(resources_folder) if slide.endswith('gif') or slide.endswith('jpg')]
# endlessly read in the slides so we can show them on the tkinter Label
chdir(resources_folder)
self.iterableCycle = cycle((PhotoImage(file=slide), slide) for slide in listOfSlides)
# create tkinter Label widget which can also display images
self.slidesLabel = Label(self)
# create the Frame widget
self.slidesLabel.pack()
def slidesCallback(self):
# get next slide from iterable cycle
currentInstance, nameOfSlide = next(self.iterableCycle)
# assign next slide to Label widget
self.slidesLabel.config(image=currentInstance)
# update Window title with current slide
self.title(nameOfSlide)
# recursively repeat the Show
self.after(self.showTime, self.slidesCallback)
#=================================
# Start GUI
#=================================
win = SlideShow()
win.after(0, win.slidesCallback())
win.mainloop()
