added input_handler.py module to help with inputs

pocket_friends/game_files/classes/input_handler.py

@@ -0,0 +1,71 @@
+import pygame
+import importlib.util
+from pocket_friends.hardware.gpio_handler import Constants, GPIOHandler
+
+
+class InputHandler:
+    def __init__(self, pygame_clock):
+        self.clock = pygame_clock
+        try:
+            importlib.util.find_spec('RPi.GPIO')
+            import RPi.GPIO as GPIO
+            self.on_hardware = True
+        except ImportError:
+            import pocket_friends.development.FakeGPIO as GPIO
+            self.on_hardware = False
+        self.last_input_tick = 0
+
+    def create_event(self, pressed_button):
+        """
+        Creates a pygame event with a given keyboard code
+        :param pressed_button:
+        """
+        # Register a button click so long as the last button click happened no less than two frames ago
+        if pygame.time.get_ticks() - self.last_input_tick > self.clock.get_time() * 2 or not self.on_hardware:
+            pygame.event.post(pygame.event.Event(pygame.KEYDOWN, {'key': pressed_button}))
+            pygame.event.post(pygame.event.Event(pygame.KEYUP, {'key': pressed_button}))
+        self.last_input_tick = pygame.time.get_ticks()
+
+    def handle_gpio(self):
+        """
+        Handles getting GPIO button presses and making a pygame event when a press is detected.
+        """
+        for pressed_button in Constants.buttons:
+            code = Constants.buttons.get(pressed_button)
+
+            # Check if a button has been pressed. If it has, create a pygame event for it.
+            if GPIOHandler.get_press(code):
+                self.create_event(code)
+
+    def keyboard_handler(self):
+        """
+        Simulates key presses to GPIO button presses. Also handles quitting the game.
+        """
+
+        # Checks if a corresponding keyboard key has been pressed. If it has, emulate a button press.
+        for keyboard_event in pygame.event.get():
+            if keyboard_event.type == pygame.QUIT:
+                running = False
+            if keyboard_event.type == pygame.KEYDOWN:
+                if keyboard_event.key == pygame.K_a:
+                    self.create_event(Constants.buttons.get('a'))
+                if keyboard_event.key == pygame.K_b:
+                    self.create_event(Constants.buttons.get('b'))
+                if keyboard_event.key == pygame.K_PERIOD:
+                    self.create_event(Constants.buttons.get('j_i'))
+                if keyboard_event.key == pygame.K_RIGHT:
+                    self.create_event(Constants.buttons.get('j_r'))
+                if keyboard_event.key == pygame.K_LEFT:
+                    self.create_event(Constants.buttons.get('j_l'))
+                if keyboard_event.key == pygame.K_DOWN:
+                    self.create_event(Constants.buttons.get('j_d'))
+                if keyboard_event.key == pygame.K_UP:
+                    self.create_event(Constants.buttons.get('j_u'))
+                if keyboard_event.key == pygame.K_ESCAPE:
+                    running = False
+
+    def update(self):
+        if self.on_hardware:
+            self.handle_gpio()
+        else:
+            self.keyboard_handler()