basic cursor

BingoBoard.py

@@ -2,6 +2,7 @@ from textual.reactive import reactive
 from textual.widget import Widget
 from textual.app import ComposeResult
 from textual.message import Message
+from textual import events
 
 from datetime import datetime
 import random
@@ -75,6 +76,20 @@ class BingoBoard(Widget):
         fields = self.query(BingoField)
         fields[self.fieldnum_from_cursor()].set_highlighted(False)
 
+    def on_key(self, event: events.Key) -> None:
+        fields = self.query(BingoField)
+        fields[self.fieldnum_from_cursor()].set_highlighted(False)
+        match event.key:
+            case 'up':
+                self.cursor_y -= 1 if self.cursor_y > 0 else 0
+            case 'down':
+                self.cursor_y += 1 if self.cursor_y < 4 else 0
+            case 'left':
+                self.cursor_x -= 1 if self.cursor_x > 0 else 0
+            case 'right':
+                self.cursor_x += 1 if self.cursor_x < 4 else 0
+        fields[self.fieldnum_from_cursor()].set_highlighted(True)
+
 
     async def on_bingo_field_selected(self, message: BingoField.Selected) -> None:
         self.fieldstate[message.num] = message.selected