feat(text_input): add event handler function (mouse and keyboard input)

src/text_input.py

@@ -9,7 +9,7 @@ class TextInput:
         # input text
         self.text = ""
 
-        self.active = True
+        self.active = False
 
         # colors
         self.text_color = (255, 255, 255)
@@ -18,8 +18,25 @@ class TextInput:
         self.background_color = (30, 30, 30)
 
     def handle_event(self, event):
-        # todo check keyboard input events
-        pass
+        # check if mouse click event on text input box
+        if event.type == pygame.MOUSEBUTTONDOWN:
+            if self.rect.collidepoint(event.pos):
+                self.active = True
+            else:
+                self.active = False
+
+        # check for keyboard input
+        if event.type == pygame.KEYDOWN and self.active:
+            # enter will submit and exit input box
+            if event.key == pygame.K_RETURN:
+                self.active = False
+
+            # backspace will delete last character
+            elif event.key == pygame.K_BACKSPACE:
+                self.text = self.text[:-1]
+            # other characters will be added to the string
+            else:
+                self.text += event.unicode
 
     def draw(self, screen):
         # draw background of input box