4 files changed, 33 insertions, 4 deletions
diff --git a/pycameltris/controller.py b/pycameltris/controller.py
index 9878536..86f5bcb 100644
--- a/pycameltris/controller.py
+++ b/pycameltris/controller.py
@@ -1,3 +1,4 @@
+import abc
 import enum
 
 import pygame
@@ -13,7 +14,21 @@ class Input(enum.Enum):
     QUIT = 6
 
 
-class JoystickController:
+class Controller(abc.ABC):
+    @abc.abstractmethod
+    def is_pressed(self, input_: Input):
+        pass
+
+    @abc.abstractmethod
+    def get_input_down(self, event):
+        pass
+
+    @abc.abstractmethod
+    def get_input_up(self, event):
+        pass
+
+
+class JoystickController(Controller):
 
     class PS3Controller(enum.Enum):
         CROSS = 0
@@ -57,7 +72,7 @@ class JoystickController:
         return None
 
 
-class KeyboardController:
+class KeyboardController(Controller):
     def __init__(self, keyboard):
         self.keyboard = keyboard
         self.mapping = {
diff --git a/pycameltris/screens/InGame.py b/pycameltris/screens/InGame.py
index f865c77..aa3e53b 100644
--- a/pycameltris/screens/InGame.py
+++ b/pycameltris/screens/InGame.py
@@ -5,6 +5,7 @@ import sys
 
 import pygame
 
+from .Screen import Screen
 from ..piece import *
 from ..controller import Input, KeyboardController, JoystickController
 from ..misc import Pause
@@ -247,7 +248,7 @@ def handle_input_released(instance, players, event):
 frames_per_gridcell = [48, 43, 38, 33, 28, 23, 18, 13, 8, 6, 5, 5, 5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1]
 
 
-class InGame:
+class InGame(Screen):
     def __init__(self, players, screen):
         self.players = players
         self.screen = screen
diff --git a/pycameltris/screens/Pause.py b/pycameltris/screens/Pause.py
index f9f8859..baca5ca 100644
--- a/pycameltris/screens/Pause.py
+++ b/pycameltris/screens/Pause.py
@@ -3,6 +3,7 @@ import sys
 
 import pygame
 
+from .Screen import Screen
 from ..controller import KeyboardController, JoystickController, Input
 from ..misc import UnPause
 
@@ -12,7 +13,7 @@ def handle_input_pressed(controller, event):
         raise UnPause()
 
 
-class Pause:
+class Pause(Screen):
     def __init__(self, screen):
         self.event_handler = dict()
 
diff --git a/pycameltris/screens/Screen.py b/pycameltris/screens/Screen.py
new file mode 100644
index 0000000..01f80ab
--- /dev/null
+++ b/pycameltris/screens/Screen.py
@@ -0,0 +1,12 @@
+import abc
+
+
+class Screen(abc.ABC):
+    @abc.abstractmethod
+    def refresh(self):
+        pass
+
+    @abc.abstractmethod
+    def oneframe(self):
+        pass
+