Loading Screen

Author: zachsamuels

res/images/loading.gif

@@ -5,7 +5,7 @@
 from .animate import Direction
 from .view import Window, View
 from .cache import ImageCache
-
+from .loading import Loading
 
 def process_image(image: bytes, width: int, height: int):
     im = Image.open(io.BytesIO(image))

src/front.py

@@ -0,0 +1,30 @@
+from PIL import Image, ImageTk
+from time import sleep
+from contextlib import suppress
+from itertools import cycle
+
+from .widget import SecondaryCanvas
+from . import IMAGES
+
+def generate_frames(im: Image):
+    with suppress(EOFError):
+        while True:
+            im.seek(im.tell()+1)
+            yield ImageTk.PhotoImage(im)
+
+class Loading(SecondaryCanvas):
+    frames = generate_frames(Image.open(IMAGES / "loading.gif"))
+    active = True
+    last = 0
+
+    def start(self):
+        for im in cycle(self.frames):
+            if not self.active:
+                break
+            if self.last:
+                self.delete(self.last)
+            self.last = self.create_image(0, 0, image=im, anchor='nw')
+            self.update()
+
+    def stop(self):
+        self.active = False