Refactor display rules.

qt_ui/displayoptions.py

@@ -0,0 +1,43 @@
+"""Visibility options for the game map."""
+from dataclasses import dataclass
+from typing import Iterator
+
+
+@dataclass
+class DisplayRule:
+    name: str
+    _value: bool
+
+    @property
+    def menu_text(self) -> str:
+        return self.name
+
+    @property
+    def value(self) -> bool:
+        return self._value
+
+    @value.setter
+    def value(self, value: bool) -> None:
+        from qt_ui.widgets.map.QLiberationMap import QLiberationMap
+        self._value = value
+        QLiberationMap.instance.reload_scene()
+        QLiberationMap.instance.update()
+
+    def __bool__(self) -> bool:
+        return self.value
+
+
+class DisplayOptions:
+    ground_objects = DisplayRule("Ground Objects", True)
+    control_points = DisplayRule("Control Points", True)
+    lines = DisplayRule("Lines", True)
+    events = DisplayRule("Events", True)
+    sam_ranges = DisplayRule("SAM Ranges", True)
+    flight_paths = DisplayRule("Flight Paths", False)
+
+    @classmethod
+    def menu_items(cls) -> Iterator[DisplayRule]:
+        # Python 3.6 enforces that __dict__ is order preserving by default.
+        for value in cls.__dict__.values():
+            if isinstance(value, DisplayRule):
+                yield value