wasp: manager: make sleep() and background() callbacks optional

Making callbacks optional reduces pointless boilerplate in applications.

1 files changed, 3 insertions, 7 deletions

diff --git a/wasp/apps/clock.py b/wasp/apps/clock.py
index c9099be..4feba63 100644
--- a/wasp/apps/clock.py
+++ b/wasp/apps/clock.py
@@ -35,19 +35,15 @@ class ClockApp():
         self.draw()
         wasp.system.request_tick(1000)
 
-    def tick(self, ticks):
-        self.update()
-
-    def background(self):
-        """De-activate the application (without losing state)."""
-        pass
-
     def sleep(self):
         return True
 
     def wake(self):
         self.update()
 
+    def tick(self, ticks):
+        self.update()
+
     def draw(self):
         """Redraw the display from scratch."""
         draw = wasp.watch.drawable