Break up map_view monopoly

2026-07-09 22:18:38 +02:00 · 2025-12-02 20:26:43 -06:00
parent a0601cd6ae
commit 3d5edf320e
6 changed files with 757 additions and 354 deletions
@@ -0,0 +1,57 @@
+import 'package:flutter_map/flutter_map.dart';
+import 'package:latlong2/latlong.dart';
+
+import '../../state/session_state.dart';
+import '../../dev_config.dart';
+
+/// Manages map interaction options and gesture handling logic.
+/// Handles constrained node interactions, zoom restrictions, and gesture configuration.
+class MapInteractionManager {
+  
+  /// Get interaction options for the map based on whether we're editing a constrained node.
+  /// Allows zoom and rotation but disables all forms of panning for constrained nodes unless extract is enabled.
+  InteractionOptions getInteractionOptions(EditNodeSession? editSession) {
+    // Check if we're editing a constrained node that's not being extracted
+    if (editSession?.originalNode.isConstrained == true && editSession?.extractFromWay != true) {
+      // Constrained node (not extracting): only allow pinch zoom and rotation, disable ALL panning
+      return const InteractionOptions(
+        enableMultiFingerGestureRace: true,
+        flags: InteractiveFlag.pinchZoom | InteractiveFlag.rotate,
+        scrollWheelVelocity: kScrollWheelVelocity,
+        pinchZoomThreshold: kPinchZoomThreshold,
+        pinchMoveThreshold: kPinchMoveThreshold,
+      );
+    }
+    
+    // Normal case: all interactions allowed with gesture race to prevent accidental rotation during zoom
+    return const InteractionOptions(
+      enableMultiFingerGestureRace: true,
+      flags: InteractiveFlag.doubleTapDragZoom |
+          InteractiveFlag.doubleTapZoom |
+          InteractiveFlag.drag |
+          InteractiveFlag.flingAnimation |
+          InteractiveFlag.pinchZoom |
+          InteractiveFlag.rotate |
+          InteractiveFlag.scrollWheelZoom,
+      scrollWheelVelocity: kScrollWheelVelocity,
+      pinchZoomThreshold: kPinchZoomThreshold,
+      pinchMoveThreshold: kPinchMoveThreshold,
+    );
+  }
+
+  /// Check if the map has moved significantly enough to cancel stale tile requests.
+  /// Uses a simple distance threshold - roughly equivalent to 1/4 screen width at zoom 15.
+  bool mapMovedSignificantly(LatLng? newCenter, LatLng? oldCenter) {
+    if (newCenter == null || oldCenter == null) return false;
+    
+    // Calculate approximate distance in meters (rough calculation for performance)
+    final latDiff = (newCenter.latitude - oldCenter.latitude).abs();
+    final lngDiff = (newCenter.longitude - oldCenter.longitude).abs();
+    
+    // Threshold: ~500 meters (roughly 1/4 screen at zoom 15)
+    // This prevents excessive cancellations on small movements while catching real pans
+    const double significantMovementThreshold = 0.005; // degrees (~500m at equator)
+    
+    return latDiff > significantMovementThreshold || lngDiff > significantMovementThreshold;
+  }
+}