Fixed annotation dragging behavior (#25)

AnnotationManager: fix drag interruption due to unlelated annotation state update
- the drag event of an annotation was stopped when there was a state update
of any annotion. This made it impossible to drag an annotation while updating
anything else on the map.

Signed-off-by: Roman Bapst <bapstroman@gmail.com>

plugin-annotation/src/main/java/com/mapbox/mapboxsdk/plugins/annotation/AnnotationManager.java

@@ -136,7 +136,7 @@ public T create(S options) {
     T t = options.build(currentId, this);
     annotations.put(t.getId(), t);
     currentId++;
-    updateSource();
+    internalUpdateSource();
     return t;
   }
 
@@ -155,7 +155,7 @@ public List<T> create(List<S> optionsList) {
       annotations.put(annotation.getId(), annotation);
       currentId++;
     }
-    updateSource();
+    internalUpdateSource();
     return annotationList;
   }
 
@@ -167,7 +167,8 @@ public List<T> create(List<S> optionsList) {
   @UiThread
   public void delete(T annotation) {
     annotations.remove(annotation.getId());
-    updateSource();
+    draggableAnnotationController.onAnnotationUpdated(annotation);
+    internalUpdateSource();
   }
 
   /**
@@ -179,8 +180,9 @@ public void delete(T annotation) {
   public void delete(List<T> annotationList) {
     for (T annotation : annotationList) {
       annotations.remove(annotation.getId());
+      draggableAnnotationController.onAnnotationUpdated(annotation);
     }
-    updateSource();
+    internalUpdateSource();
   }
 
   /**
@@ -201,7 +203,8 @@ public void deleteAll() {
   public void update(T annotation) {
     if (annotations.containsValue(annotation)) {
       annotations.put(annotation.getId(), annotation);
-      updateSource();
+      draggableAnnotationController.onAnnotationUpdated(annotation);
+      internalUpdateSource();
     } else {
       Logger.e(TAG, "Can't update annotation: "
         + annotation.toString()
@@ -218,8 +221,9 @@ public void update(T annotation) {
   public void update(List<T> annotationList) {
     for (T annotation : annotationList) {
       annotations.put(annotation.getId(), annotation);
+      draggableAnnotationController.onAnnotationUpdated(annotation);
     }
-    updateSource();
+    internalUpdateSource();
   }
 
   /**

plugin-annotation/src/main/java/com/mapbox/mapboxsdk/plugins/annotation/DraggableAnnotationController.java

@@ -97,6 +97,12 @@ void removeAnnotationManager(AnnotationManager annotationManager) {
     }
   }
 
+  void onAnnotationUpdated(Annotation annotation) {
+    if (annotation == draggedAnnotation) {
+      stopDragging(draggedAnnotation, draggedAnnotationManager);
+    }
+  }
+
   void onSourceUpdated() {
     stopDragging(draggedAnnotation, draggedAnnotationManager);
   }