New Demo - Playback animated GIFs using PIL

DemoPrograms/Demo_Animated_GIFs_Using_PIL.py

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+from PIL import Image, ImageTk, ImageSequence
+import PySimpleGUI as sg
+
+"""
+    Demo_Animated_GIFs_Using_PIL.py
+    
+    You'll find other animated GIF playback demos for PySimpleGUI that use the tkinter built-in GIF parser.
+    That is how the built-in PySimpleGUI Image.update_animation is used.
+    
+    If you want to do the GIF file parsing yourself using PIL and update your Image element yourself, then
+    this is one possible technique.
+
+    This particular demo will loop playing the GIF file over and over.  To not loop, remove the while True statement.
+    Copyright 2020 PySimpleGUI.org
+"""
+
+gif_filename = r'my_gif_file.gif'
+
+layout = [[sg.Image(key='-IMAGE-')]]
+
+window = sg.Window('Window Title', layout, element_justification='c', margins=(0,0), element_padding=(0,0), finalize=True)
+
+sequence = [ImageTk.PhotoImage(img) for img in ImageSequence.Iterator(Image.open(gif_filename))]    # must has finalized to do this
+
+interframe_duration = Image.open(gif_filename).info['duration']     # get how long to delay between frames
+
+while True:
+    for frame in sequence:
+        event, values = window.read(timeout=interframe_duration)
+        if event == sg.WIN_CLOSED:
+            exit()
+        window['-IMAGE-'].update(data=frame)