From 8ae4d1e9ae7ea9a5ba234601114ba08e76bc5aea Mon Sep 17 00:00:00 2001
From: eap <eap@opencascade.com>
Date: Mon, 19 Nov 2012 12:58:43 +0000
Subject: [PATCH] 0021985: [CEA 715] "Clear mesh data" on a skin mesh without
 geometry does not preserve the skin mesh

  New behavior:
  - mesh is built on geometry -> "Clear mesh data" removes all nodes/elements
  - mesh w/o geometry (imported, compound, made from scratch) ->
  "Clear mesh data" removes only nodes/elements computed by algorithms
---
 src/SMESH/SMESH_Mesh.cxx | 32 ++++++++++++++++++++++++--------
 1 file changed, 24 insertions(+), 8 deletions(-)

diff --git a/src/SMESH/SMESH_Mesh.cxx b/src/SMESH/SMESH_Mesh.cxx
index 8a357cd1e..2616e0b5f 100644
--- a/src/SMESH/SMESH_Mesh.cxx
+++ b/src/SMESH/SMESH_Mesh.cxx
@@ -347,16 +347,32 @@ void SMESH_Mesh::Load()
 
 void SMESH_Mesh::Clear()
 {
-  // clear mesh data
-  _myMeshDS->ClearMesh();
+  if ( HasShapeToMesh() ) // remove all nodes and elements
+  {
+    // clear mesh data
+    _myMeshDS->ClearMesh();
 
-  // update compute state of submeshes
-  if ( SMESH_subMesh *sm = GetSubMeshContaining( GetShapeToMesh() ) )
+    // update compute state of submeshes
+    if ( SMESH_subMesh *sm = GetSubMeshContaining( GetShapeToMesh() ) )
+    {
+      sm->ComputeStateEngine( SMESH_subMesh::CHECK_COMPUTE_STATE );
+      sm->ComputeSubMeshStateEngine( SMESH_subMesh::CHECK_COMPUTE_STATE );
+      sm->ComputeStateEngine( SMESH_subMesh::CLEAN ); // for event listeners (issue 0020918)
+      sm->ComputeSubMeshStateEngine( SMESH_subMesh::CLEAN );
+    }
+  }
+  else // remove only nodes/elements computed by algorithms
   {
-    sm->ComputeStateEngine( SMESH_subMesh::CHECK_COMPUTE_STATE );
-    sm->ComputeSubMeshStateEngine( SMESH_subMesh::CHECK_COMPUTE_STATE );
-    sm->ComputeStateEngine( SMESH_subMesh::CLEAN ); // for event listeners (issue 0020918)
-    sm->ComputeSubMeshStateEngine( SMESH_subMesh::CLEAN );
+    if ( SMESH_subMesh *sm = GetSubMeshContaining( GetShapeToMesh() ) )
+    {
+      SMESH_subMeshIteratorPtr smIt = sm->getDependsOnIterator(/*includeSelf=*/true,
+                                                               /*complexShapeFirst=*/true);
+      while ( smIt->more() )
+      {
+        sm = smIt->next();
+        sm->ComputeStateEngine( SMESH_subMesh::CLEAN );
+      }
+    }
   }
   _isModified = false;
 }
-- 
2.39.2