slideshow.py

# -*- coding: utf-8 -*-
import Tkinter as tk
import sys
import os
from PIL import Image, ImageTk

class SlideshowApp(tk.Frame):

    def __init__(self, master = None):
        tk.Frame.__init__(self, master)
        self.pack()

        self.current_image_index = 0
        self.image_list = []
        self.delay = 3000 # 3 seconds
        self.timer_id = None

        self._create_widgets()

    def _create_widgets(self):
        self.CANVAS = tk.Canvas(self, bd = 2, width = 800, height = 600, bg = 'black')
        self.CANVAS.grid(column = 0, row = 0, columnspan = 2)

        self.START = tk.Button(self, text = "Rozpocznij pokaz", command = self.start_slideshow)
        self.START.grid(column = 0, row = 1, sticky = tk.E + tk.W)

        self.QUIT = tk.Button(self, text = "Zamknij", command = self.quit)
        self.QUIT.grid(column = 1, row = 1, sticky = tk.E + tk.W)

    def start_slideshow(self):
        if self.timer_id is not None:
            return

        if len(self.image_list) != 0:
            self.current_image_index = -1
            self.next_image()

    def next_image(self):
        self.current_image_index = (self.current_image_index + 1) % len(self.image_list)
        try:
            image = Image.open(self.image_list[self.current_image_index])
            image = self.scale_if_needed(image, 800, 600)
            photo = ImageTk.PhotoImage(image)
            self.CANVAS.create_image(400, 300, image = photo)
            self.current_image = photo # keep the references
        except tk.TclError, er:
            print "TCL exception:", e
        self.timer_id = self.after(self.delay, self.next_image)

    def scale_if_needed(self, image, w, h):
        iw, ih = image.size
        if iw > w and iw > ih:
            scale = w * 1.0 / iw
        elif ih > h and ih > iw:
            scale = h * 1.0 / ih
        else:
            return image

        return image.resize((int(iw * scale), int(ih * scale)))

if len(sys.argv) == 1:
    print "Użycie: ./slideshow.py <obrazek1> ... <obrazekN>"
    sys.exit(1)

root = tk.Tk()
app = SlideshowApp(master = root)
app.image_list = sys.argv[1:]
app.mainloop()