Adding splitter and saving layout state when closing the app

src/gui/main_window.py

@@ -13,7 +13,7 @@ from PySide6.QtWidgets import (
     QVBoxLayout,
     QLabel,
 )
-from PySide6.QtCore import Qt, QTimer
+from PySide6.QtCore import Qt, QTimer, QSettings
 from PySide6.QtGui import QAction, QKeySequence
 
 from src.database.db_manager import DatabaseManager
@@ -52,8 +52,8 @@ class MainWindow(QMainWindow):
         self._create_tab_widget()
         self._create_status_bar()
 
-        # Center window on screen
-        self._center_window()
+        # Restore window geometry or center window on screen
+        self._restore_window_state()
 
         logger.info("Main window initialized")
 
@@ -156,6 +156,24 @@ class MainWindow(QMainWindow):
             (screen.width() - size.width()) // 2, (screen.height() - size.height()) // 2
         )
 
+    def _restore_window_state(self):
+        """Restore window geometry from settings or center window."""
+        settings = QSettings("microscopy_app", "object_detection")
+        geometry = settings.value("main_window/geometry")
+
+        if geometry:
+            self.restoreGeometry(geometry)
+            logger.debug("Restored window geometry from settings")
+        else:
+            self._center_window()
+            logger.debug("Centered window on screen")
+
+    def _save_window_state(self):
+        """Save window geometry to settings."""
+        settings = QSettings("microscopy_app", "object_detection")
+        settings.setValue("main_window/geometry", self.saveGeometry())
+        logger.debug("Saved window geometry to settings")
+
     def _show_settings(self):
         """Show settings dialog."""
         logger.info("Opening settings dialog")
@@ -276,6 +294,13 @@ class MainWindow(QMainWindow):
         )
 
         if reply == QMessageBox.Yes:
+            # Save window state before closing
+            self._save_window_state()
+
+            # Save annotation tab state if it exists
+            if hasattr(self, "annotation_tab"):
+                self.annotation_tab.save_state()
+
             logger.info("Application closing")
             event.accept()
         else: