Disable tapping while an identify operation is in progress (#192)

Author: PaulAllanSturm

lib/samples/identify_features_in_wms_layer/identify_features_in_wms_layer.dart

@@ -121,6 +121,9 @@ class _IdentifyFeaturesInWmsLayerState extends State<IdentifyFeaturesInWmsLayer>
   }
 
   void onTap(Offset localPosition) async {
+    // Prevent addtional taps until the identify operation is complete.
+    setState(() => _ready = false);
+
     // When the map view is tapped, perform an identify operation on the WMS layer.
     final identifyLayerResult = await _mapViewController.identifyLayer(
       _wmsLayer,
@@ -148,6 +151,9 @@ class _IdentifyFeaturesInWmsLayerState extends State<IdentifyFeaturesInWmsLayer>
         showResultsDialog();
       }
     }
+
+    // Allow additional taps.
+    setState(() => _ready = true);
   }
 
   void showResultsDialog() {