Refactor Cart into checkerboard table

Closes: #173 (closed)

Removes clear all feature from: #233

This one improves focus behavior in the cart, moving cart items and deleting items from the cart.

clive/__private/ui/operations/cart.py

@@ -211,6 +211,19 @@ class CartTable(CliveCheckerboardTable):
         ]
         return self._rows
 
+    @staticmethod
+    def _create_widget_id_to_focus(event: CartItem.Focus | CartItem.Move) -> str:
+        assert event.button_to_focus is not None, "Button to focus has to be passed to get it's id."
+        return event.button_to_focus
+
+    def _disable_appropriate_button(self, widget: CartItem) -> None:
+        if len(self.app.world.profile.cart) > 0 and widget.reactive_idx == 0:
+            # disable first ButtomMoveUp if first element was removed
+            self.query(ButtonMoveUp)[0].disabled = True
+        if 0 < len(self.app.world.profile.cart) == widget.reactive_idx:
+            # disable last ButtonMoveDown if only last element was removed
+            self.query(ButtonMoveDown)[-1].disabled = True
+
     def _handle_remove_event(self, triggering_widget: CartItem) -> None:
         def devalue_indexes(rows: Sequence[CartItem]) -> None:
             for row in rows:
@@ -243,13 +256,7 @@ class CartTable(CliveCheckerboardTable):
         self.profile.cart.remove(event.widget.operation)
         self._handle_remove_event(triggering_widget=event.widget)
         self.app.trigger_profile_watchers()
-
-        if len(self.app.world.profile.cart) > 0 and event.widget.reactive_idx == 0:
-            # disable first ButtomMoveUp if first element was removed
-            self.query(ButtonMoveUp)[0].disabled = True
-        if 0 < len(self.app.world.profile.cart) == event.widget.reactive_idx:
-            # disable last ButtonMoveDown if only last element was removed
-            self.query(ButtonMoveDown)[-1].disabled = True
+        self._disable_appropriate_button(event.widget)
 
     @on(CartItem.Move)
     async def move_item(self, event: CartItem.Move) -> None:
@@ -264,7 +271,8 @@ class CartTable(CliveCheckerboardTable):
             if event.to_idx == cart_item.reactive_idx:
                 self.app.set_focus(cart_item)
                 if event.button_to_focus:
-                    cart_item.query_one(f"#{event.button_to_focus}").focus()
+                    button_id = self._create_widget_id_to_focus(event)
+                    cart_item.query_one(f"#{button_id}").focus()
 
     @on(CartItem.Focus)
     def focus_item(self, event: CartItem.Focus) -> None:
@@ -272,7 +280,8 @@ class CartTable(CliveCheckerboardTable):
             if event.target_idx == cart_item.reactive_idx:
                 self.app.set_focus(cart_item)
                 if event.button_to_focus:
-                    cart_item.query_one(f"#{event.button_to_focus}").focus()
+                    button_id = self._create_widget_id_to_focus(event)
+                    cart_item.query_one(f"#{button_id}").focus()
 
 
 class Cart(BaseScreen):