Initial

composer.py

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+import sys
+from base import BaseWindow
+from windows import CustomerWindow, CashierWindow, LoginWindow
+from PyQt6.QtWidgets import QApplication
+from PyQt6.QtCore import pyqtSignal, pyqtSlot, QObject
+
+
+class Composer(QObject):
+    render_request = pyqtSignal(str)
+
+    def __init__(self,
+                 app: QApplication
+                ):
+        super().__init__()
+
+        self._app = app
+        self._entry = LoginWindow("Окно Авторизации", "", self)
+        self._current = None
+
+        self.render_request.connect(self._render)
+
+    def run(self):
+        self._current = self._entry
+        self._current.show()
+        sys.exit(self._app.exec())
+
+    @pyqtSlot(str)
+    def _render(self, user: str):
+        if self._current:
+            self._current.close()
+
+        match user:
+            case "Покупатель":
+                window = CustomerWindow("Покупатель", user, self)
+            case "Кассир":
+                window = CashierWindow("Кассир", user, self)
+
+        self._current = window
+        self._current.show()