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

@@ -10,6 +10,7 @@ from textual.reactive import reactive
 from textual.widgets import Static
 
 from clive.__private.core.formatters.humanize import humanize_operation_details, humanize_operation_name
+from clive.__private.logger import logger
 from clive.__private.ui.get_css import get_relative_css_path
 from clive.__private.ui.shared.base_screen import BaseScreen
 from clive.__private.ui.transaction_summary import TransactionSummaryFromCart
@@ -60,6 +61,12 @@ class CartItem(CliveCheckerboardTableRow, CliveWidget, can_focus=True):
         Binding("ctrl+down", "select_next", "Next"),
     ]
 
+    class RemovalCheck(Message):
+        """Message for checking if removal is in progress."""
+        def __init__(self, widget: CartItem) -> None:
+            self.widget = widget
+            super().__init__()
+
     class Delete(Message):
         def __init__(self, widget: CartItem) -> None:
             self.widget = widget
@@ -79,6 +86,9 @@ class CartItem(CliveCheckerboardTableRow, CliveWidget, can_focus=True):
             self.focus_button = focus_button
             super().__init__()
 
+    class StartRemovalProcess(Message):
+        """Message to prevent sending duplicated Delete message."""
+
     def __init__(self, operation_idx: int) -> None:
         self._idx = operation_idx
 
@@ -95,6 +105,7 @@ class CartItem(CliveCheckerboardTableRow, CliveWidget, can_focus=True):
                 classes="actions",
             ),
         )
+        self._ready_for_deletion = False
 
     def __repr__(self) -> str:
         return f"{self.__class__.__name__}(idx={self._idx})"
@@ -147,6 +158,14 @@ class CartItem(CliveCheckerboardTableRow, CliveWidget, can_focus=True):
         assert self.is_valid(self._idx), "cannot get operation, position is invalid"
         return self.profile.cart[self._idx]
 
+    @property
+    def ready_for_deletion(self) -> bool:
+        return self._ready_for_deletion
+
+    @ready_for_deletion.setter
+    def ready_for_deletion(self, value: bool) -> None:
+        self._ready_for_deletion = value
+
     @property
     def __operations_count(self) -> int:
         return len(self.profile.cart)
@@ -169,10 +188,10 @@ class CartItem(CliveCheckerboardTableRow, CliveWidget, can_focus=True):
 
     @on(CliveButton.Pressed, "#delete-button")
     def delete(self) -> None:
-        cart = self.app.query_one(Cart)
-
-        if cart.ready_to_delete_item:
-            cart.toggle_removal_in_progress()
+        self.post_message(self.RemovalCheck(self))
+        logger.debug(f"DELETE CLICKED, READY?: {self._ready_for_deletion}")
+        if self._ready_for_deletion:
+            self.post_message(self.StartRemovalProcess())
             self.post_message(self.Delete(self))
 
     @on(Move)
@@ -228,8 +247,12 @@ class Cart(BaseScreen):
         with self.__scrollable_part:
             yield self._cart_table
 
-    def toggle_removal_in_progress(self) -> None:
-        self._removal_in_progress = not self._removal_in_progress
+    def _start_removal_process(self) -> None:
+        self._removal_in_progress = True
+
+    def _end_removal_process(self) -> None:
+        self.app.trigger_profile_watchers()
+        self._removal_in_progress = False
 
     async def __rebuild_items(self, from_index: int = 0, to_index: int | None = None) -> None:
         await self._cart_table.rebuild(starting_from_element=from_index, ending_with_element=to_index)
@@ -260,13 +283,20 @@ class Cart(BaseScreen):
             for cell, value in zip(cells, data):
                 cell.update_content(value)  # type: ignore[arg-type]
 
+    @on(CartItem.RemovalCheck)
+    def check_removal(self, event: CartItem.RemovalCheck) -> None:
+        event.widget.ready_for_deletion = self.ready_to_delete_item
+
+    @on(CartItem.StartRemovalProcess)
+    def start_removal_process(self) -> None:
+        self._start_removal_process()
+
     @on(CartItem.Delete)
     async def remove_item(self, event: CartItem.Delete) -> None:
         await self.query(CliveCheckerboardTableRow)[event.widget.reactive_idx].remove()
         self.profile.cart.remove(event.widget.operation)
         self._handle_remove_event(triggering_widget=event.widget)
-        self.app.trigger_profile_watchers()
-        self._removal_in_progress = False
+        self._end_removal_process()
 
         if len(self.app.world.profile.cart) > 0 and event.widget.reactive_idx == 0:
             # disable first ButtomMoveUp if first element was removed