added callback on change object in pick point manager (#4766)

* added callback on change object in pick point manager

* comments added

* fixes after review

Author: kulikovss

source/MRViewer/MRPickPointManager.cpp

@@ -306,6 +306,8 @@ std::shared_ptr<SurfacePointWidget> PickPointManager::createPickWidget_( const s
         {
             if ( auto obj = objPtr.lock() )
             {
+                if ( params.onUpdatePoints && !params.onUpdatePoints( obj ) )
+                    return;
                 auto& points = pickedPoints_[obj];
                 const auto pointCount = points.size();
                 for ( auto i = (int)pointCount - 1; i >= 0; --i )

source/MRViewer/MRPickPointManager.h

@@ -22,6 +22,7 @@ class MRVIEWER_CLASS PickPointManager : public MultiListener<
 public:
     using PickerPointCallBack = std::function<void( std::shared_ptr<VisualObject> obj, int index )>;
     using AllowCallBack = std::function<bool( const std::shared_ptr<VisualObject>& obj, int index )>;
+    using ChangeObjectCallBack = std::function<bool( const std::shared_ptr<VisualObject>& obj )>;
 
     struct Params
     {
@@ -78,6 +79,11 @@ class MRVIEWER_CLASS PickPointManager : public MultiListener<
 
         /// This callback is invoked when a point is removed with its index before deletion
         PickerPointCallBack onPointRemove;
+
+        /// This callback is invoked when an object was changed and needed update of points
+        /// Return false if need to skip internal updates
+        ChangeObjectCallBack onUpdatePoints;
+
     };
     Params params;