Break up mapmodel.py monolith.

qt_ui/widgets/map/model/frontlinejs.py

@@ -0,0 +1,37 @@
+from __future__ import annotations
+
+from typing import List
+
+from PySide2.QtCore import Property, QObject, Signal, Slot
+
+from game.theater import ConflictTheater, FrontLine
+from game.utils import nautical_miles
+from qt_ui.dialogs import Dialog
+from .leaflet import LeafletLatLon
+
+
+class FrontLineJs(QObject):
+    extentsChanged = Signal()
+
+    def __init__(self, front_line: FrontLine, theater: ConflictTheater) -> None:
+        super().__init__()
+        self.front_line = front_line
+        self.theater = theater
+
+    @Property(list, notify=extentsChanged)
+    def extents(self) -> List[LeafletLatLon]:
+        a = self.theater.point_to_ll(
+            self.front_line.position.point_from_heading(
+                self.front_line.attack_heading.right.degrees, nautical_miles(2).meters
+            )
+        )
+        b = self.theater.point_to_ll(
+            self.front_line.position.point_from_heading(
+                self.front_line.attack_heading.left.degrees, nautical_miles(2).meters
+            )
+        )
+        return [[a.latitude, a.longitude], [b.latitude, b.longitude]]
+
+    @Slot()
+    def showPackageDialog(self) -> None:
+        Dialog.open_new_package_dialog(self.front_line)