Moving items in the graph

src/bedit_gui/services/application_settings.py

@@ -10,6 +10,8 @@ class ApplicationSettings:
 
     LOG_LEVEL_KEY = "logging/level"
     DEFAULT_LOG_LEVEL = logging.INFO
+    SNAP_TO_GRID_SIZE_KEY = "graph/snap_to_grid_size"
+    DEFAULT_SNAP_TO_GRID_SIZE = 4
 
     def __init__(self, settings: QSettings | None = None) -> None:
         self._settings = settings if settings is not None else QSettings()
@@ -26,6 +28,16 @@ class ApplicationSettings:
     def log_level(self, level: int) -> None:
         self._settings.setValue(self.LOG_LEVEL_KEY, level)
 
+    @property
+    def snap_to_grid_size(self) -> int:
+        return max(1, self._settings.value(self.SNAP_TO_GRID_SIZE_KEY, self.DEFAULT_SNAP_TO_GRID_SIZE, type=int))
+
+    @snap_to_grid_size.setter
+    def snap_to_grid_size(self, size: int) -> None:
+        if size < 1:
+            raise ValueError("snap-to-grid size must be positive")
+        self._settings.setValue(self.SNAP_TO_GRID_SIZE_KEY, size)
+
 class SimulationApplicationSettings:
     """Typed access to persistent BEsim application settings."""