simple example how to use StreamdeckFilter

Author: Kalle-Wirsch

src/example.py

@@ -8,8 +8,10 @@
 #
 
 import StreamDeck.StreamDeck as StreamDeck
+from StreamDeck.StreamDeckFilter import CallBackFilter, TempoFilter, StateChangedFilter, DebounceFilter
 import threading
 from PIL import Image, ImageDraw, ImageFont
+import json
 
 
 # Custom tiles with run-time generated text and custom image via the PIL module
@@ -41,7 +43,7 @@ def get_key_image(deck, key, state):
 
     # Recombine the B, G and R elements in the order the display expects them,
     # and convert the resulting image to a sequence of bytes
-    rgb = { "R": r, "G": g, "B": b }
+    rgb = {"R": r, "G": g, "B": b}
     return Image.merge("RGB", (rgb[order[0]], rgb[order[1]], rgb[order[2]])).tobytes()
 
 
@@ -55,6 +57,24 @@ def key_change_callback(deck, key, state):
         deck.close()
 
 
+class MyEncoder(json.JSONEncoder):
+    def default(self, obj):
+        if isinstance(obj, CallBackFilter):
+            return obj.json_serialize()
+        else:
+            super().default(obj)
+
+
+def json_decode(x):
+    if isinstance(x, dict):
+        key, value = next(iter(x.items()))
+        if key in ['CallBackFilter', 'TempoFilter', 'DebounceFilter', 'StateChangedFilter']:
+            cbf_class = globals()[key]
+            return cbf_class.json_deserialize(value)
+    return x
+
+
+
 if __name__ == "__main__":
     manager = StreamDeck.DeviceManager()
     decks = manager.enumerate()
@@ -69,8 +89,25 @@ def key_change_callback(deck, key, state):
 
         deck.set_brightness(30)
 
-        for key in range(deck.key_count()):
-            deck.set_key_image(key, get_key_image(deck, key, False))
+        for key in range(deck.key_count()):     
+            if key%5 == 0: # column 5
+                 deck.filter[key] = TempoFilter(default_state=True, tempo_delay=0.5)
+            elif key%5 == 1: # column 4
+                deck.filter[key] = TempoFilter(default_state=False)
+            elif key % 5 == 2:  # column 3
+                deck.filter[key] = DebounceFilter(default_state=True, key_delay=2)
+            elif key % 5 == 3:  # column 2
+                deck.filter[key] = DebounceFilter(default_state=False)
+
+            deck.set_key_image(key, get_key_image(deck, key, deck.last_key_states[key]))
+
+        # serialize, deserialize a simple button class
+        Button = {'name': "somebutton", 'cbfilter':TempoFilter()}
+        print (Button)
+        s = json.dumps(Button, cls=MyEncoder)
+        print (s)
+        Button = json.loads(s, object_hook=json_decode)
+        print(Button)
 
         deck.set_key_callback(key_change_callback)