Bug 0019389: Impossible to create a group with a selection in another group.

src/SMESHGUI/SMESHGUI_GroupDlg.cxx

@@ -63,6 +63,10 @@
 
 #include "utilities.h"
 
+// VTK Includes
+#include <vtkRenderer.h>
+#include <vtkActorCollection.h>
+
 // OCCT Includes
 #include <TColStd_MapOfInteger.hxx>
 
@@ -485,8 +489,10 @@ void SMESHGUI_GroupDlg::init (SMESH::SMESH_Mesh_ptr theMesh)
   myGroup = SMESH::SMESH_Group::_nil();
   myGroupOnGeom = SMESH::SMESH_GroupOnGeom::_nil();
 
-  myActor = SMESH::FindActorByObject(myMesh);
+  // NPAL19389: create a group with a selection in another group
-  SMESH::SetPickable(myActor);
+  // set actor of myMesh, if it is visible, else try
+  // any visible actor of group or submesh of myMesh
+  SetAppropriateActor();
 
   setDefaultGroupColor();
 
@@ -536,6 +542,12 @@ void SMESHGUI_GroupDlg::init (SMESH::SMESH_GroupBase_ptr theGroup)
 
   if (!myGroup->_is_nil())
   {
+    // NPAL19389: create a group with a selection in another group
+    // set actor of myMesh, if it is visible, else set
+    // actor of myGroup, if it is visible, else try
+    // any visible actor of group or submesh of myMesh
+    // commented, because an attempt to set selection on not displayed cells leads to error
+    //SetAppropriateActor();
     myActor = SMESH::FindActorByObject(myMesh);
     if ( !myActor )
       myActor = SMESH::FindActorByObject(myGroup);
@@ -549,6 +561,8 @@ void SMESHGUI_GroupDlg::init (SMESH::SMESH_GroupBase_ptr theGroup)
     setSelectionMode(aType);
     myTypeId = aType;
 
+    setShowEntityMode(); // depends on myTypeId
+
     myIdList.clear();
     if (!myGroup->IsEmpty()) {
       SMESH::long_array_var anElements = myGroup->GetListOfID();
@@ -566,9 +580,15 @@ void SMESHGUI_GroupDlg::init (SMESH::SMESH_GroupBase_ptr theGroup)
 
     if ( !myGroupOnGeom->_is_nil() )
     {
+      // NPAL19389: create a group with a selection in another group
+      // set actor of myMesh, if it is visible, else set
+      // actor of myGroupOnGeom, if it is visible, else try
+      // any visible actor of group or submesh of myMesh
+      // commented, because an attempt to set selection on not displayed cells leads to error
+      //SetAppropriateActor();
       myActor = SMESH::FindActorByObject(myMesh);
       if ( !myActor )
-	    myActor = SMESH::FindActorByObject(myGroup);
+        myActor = SMESH::FindActorByObject(myGroupOnGeom);
       SMESH::SetPickable(myActor);
 
       myGrpTypeGroup->setButton(1);
@@ -973,11 +993,13 @@ void SMESHGUI_GroupDlg::onObjectSelectionChanged()
   int aNbSel = aList.Extent();
   myElements->clearSelection();
 
-  if (myCurrentLineEdit) {
+  if (myCurrentLineEdit)
+  {
     myCurrentLineEdit->setText("");
     QString aString = "";
 
-    if (myCurrentLineEdit == myMeshGroupLine) {
+    if (myCurrentLineEdit == myMeshGroupLine)
+    {
       mySelectSubMesh->setEnabled(false);
       mySelectGroup->setEnabled(false);
       myGroupLine->setText("");
@@ -1021,8 +1043,10 @@ void SMESHGUI_GroupDlg::onObjectSelectionChanged()
         }
         myGroup = SMESH::SMESH_Group::_nil();
 
-        myActor = SMESH::FindActorByObject(myMesh);
+        // NPAL19389: create a group with a selection in another group
-        SMESH::SetPickable(myActor);
+        // set actor of myMesh, if it is visible, else try
+        // any visible actor of group or submesh of myMesh
+        SetAppropriateActor();
 
         aString = aList.First()->getName();
         myMeshGroupLine->setText(aString);
@@ -1069,9 +1093,9 @@ void SMESHGUI_GroupDlg::onObjectSelectionChanged()
 
       myIsBusy = false;
       return;
-
+    }
-    } else if (myCurrentLineEdit == myGeomGroupLine) {
+    else if (myCurrentLineEdit == myGeomGroupLine)
-
+    {
       myGeomObjects = new GEOM::ListOfGO();
 
       // The mesh SObject
@@ -1092,8 +1116,8 @@ void SMESHGUI_GroupDlg::onObjectSelectionChanged()
       int i = 0;
 
       SALOME_ListIteratorOfListIO anIt (aList);
-      for (; anIt.More(); anIt.Next()) {
+      for (; anIt.More(); anIt.Next())
-	
+      {
         testResult = Standard_False;
         aGeomGroup = GEOMBase::ConvertIOinGEOMObject(anIt.Value(), testResult);
 
@@ -1101,7 +1125,6 @@ void SMESHGUI_GroupDlg::onObjectSelectionChanged()
         if (!testResult || CORBA::is_nil(aGeomGroup))
           continue;
 
-
         // Check if group constructed on the same shape as a mesh or on its child
         _PTR(Study) aStudy = SMESH::GetActiveStudyDocument();
         GEOM::GEOM_IGroupOperations_var anOp =
@@ -1176,9 +1199,46 @@ void SMESHGUI_GroupDlg::onObjectSelectionChanged()
     }
 
     updateButtons();
+  }
+  else // !myCurrentLineEdit: local selection of nodes or elements
+  {
+    if (aNbSel == 1 && myActor && myActor->hasIO())
+    {
+#ifdef ENABLE_SWITCH_ACTOR_DURING_ELEMENTS_SELECTION
+      // NPAL19389: create a group with a selection in another group
+      // Switch myActor to the newly selected one, if the last
+      // is visible and belongs to group or submesh of myMesh
+      Handle(SALOME_InteractiveObject) curIO = myActor->getIO();
+      Handle(SALOME_InteractiveObject) selIO = aList.First();
+      if (curIO->hasEntry() && selIO->hasEntry()) {
+        const char* selEntry = selIO->getEntry();
+        if (strcmp(curIO->getEntry(), selEntry) != 0) {
+          // different objects: selected and myActor
+          SVTK_ViewWindow* aViewWindow = SMESH::GetCurrentVtkView();
+          if (aViewWindow && aViewWindow->isVisible(selIO)) {
+            // newly selected actor is visible
+
+            // mesh entry
+            _PTR(SObject) aSObject = SMESH::FindSObject(myMesh);
+            if (aSObject) {
+              CORBA::String_var meshEntry = aSObject->GetID().c_str();
+              int len = strlen(meshEntry);
+
+              if (strncmp(selEntry, meshEntry, len) == 0) {
+                // selected object is myMesh or a part of it
+                SMESH_Actor* anActor = SMESH::FindActorByEntry(selEntry);
+                if (anActor) {
+                  myActor = anActor;
+                  SMESH::SetPickable(myActor);
+                }
+              }
+            }
+          }
+        }
+      }
+      // NPAL19389 END
+#endif // ENABLE_SWITCH_ACTOR_DURING_ELEMENTS_SELECTION
 
-  } else {
-    if (aNbSel == 1 && myActor ) {
       QString aListStr = "";
       int aNbItems = 0;
       if (myTypeId == 0) {
@@ -1206,6 +1266,11 @@ void SMESHGUI_GroupDlg::onObjectSelectionChanged()
       myActor = SMESH::FindActorByObject(myMesh);
   }
 
+  // somehow, if we display the mesh, while selecting from another actor,
+  // the mesh becomes pickable, and there is no way to select any element
+  if (myActor)
+    SMESH::SetPickable(myActor);
+
   myIsBusy = false;
 }
 
@@ -1398,7 +1463,6 @@ void SMESHGUI_GroupDlg::onAdd()
     mySelector->SetSelectionMode(ActorSelection);
   }
 
-
   if (myCurrentLineEdit == 0) {
     //if (aNbSel != 1) { myIsBusy = false; return; }
     QString aListStr = "";
@@ -1716,7 +1780,8 @@ void SMESHGUI_GroupDlg::onHelp()
 {
   LightApp_Application* app = (LightApp_Application*)(SUIT_Session::session()->activeApplication());
   if (app)
-    app->onHelpContextModule(mySMESHGUI ? app->moduleName(mySMESHGUI->moduleName()) : QString(""), myHelpFileName);
+    app->onHelpContextModule(mySMESHGUI ? app->moduleName(mySMESHGUI->moduleName()) : QString(""),
+                             myHelpFileName);
   else {
     QString platform;
 #ifdef WIN32
@@ -1724,7 +1789,8 @@ void SMESHGUI_GroupDlg::onHelp()
 #else
     platform = "application";
 #endif
-    SUIT_MessageBox::warn1(0, QObject::tr("WRN_WARNING"),
+    SUIT_MessageBox::warn1
+      (0, QObject::tr("WRN_WARNING"),
        QObject::tr("EXTERNAL_BROWSER_CANNOT_SHOW_PAGE").
        arg(app->resourceMgr()->stringValue("ExternalBrowser", platform)).arg(myHelpFileName),
        QObject::tr("BUT_OK"));
@@ -2002,11 +2068,95 @@ void SMESHGUI_GroupDlg::setDefaultGroupColor()
   setGroupQColor( aQColor );
 }
 
+//=================================================================================
+// function : SetAppropriateActor()
+// purpose  : Find more appropriate of visible actors, set it to myActor, allow picking
+//            NPAL19389: create a group with a selection in another group.
+//            if mesh actor is not visible - find any first visible group or submesh
+//=================================================================================
+bool SMESHGUI_GroupDlg::SetAppropriateActor()
+{
+  bool isActor = false;
+
+  if (myMesh->_is_nil()) return false;
+
+  SVTK_ViewWindow* aViewWindow = SMESH::GetCurrentVtkView();
+
+  // try mesh actor
+  myActor = SMESH::FindActorByObject(myMesh);
+  if (myActor && myActor->hasIO())
+  {
+    isActor = true;
+    if (aViewWindow && !aViewWindow->isVisible(myActor->getIO()))
+        isActor = false;
+  }
+
+  // try current group actor
+  if (!isActor) {
+    if (!myGroup->_is_nil()) {
+      myActor = SMESH::FindActorByObject(myGroup);
+      if (myActor && myActor->hasIO())
+      {
+        isActor = true;
+        if (aViewWindow && !aViewWindow->isVisible(myActor->getIO()))
+            isActor = false;
+      }
+    }
+  }
+
+  // try current group on geometry actor
+  if (!isActor) {
+    if (!myGroupOnGeom->_is_nil()) {
+      myActor = SMESH::FindActorByObject(myGroupOnGeom);
+      if (myActor && myActor->hasIO())
+      {
+        isActor = true;
+        if (aViewWindow && !aViewWindow->isVisible(myActor->getIO()))
+          isActor = false;
+      }
+    }
+  }
+
+  // try any visible actor of group or submesh of current mesh
+  if (!isActor && aViewWindow) {
+    // mesh entry
+    _PTR(SObject) aSObject = SMESH::FindSObject(myMesh);
+    if (aSObject) {
+      CORBA::String_var meshEntry = aSObject->GetID().c_str();
+      int len = strlen(meshEntry);
+
+      // iterate on all actors in current view window, search for
+      // any visible actor, that belongs to group or submesh of current mesh
+      vtkActorCollection *aCollection = aViewWindow->getRenderer()->GetActors();
+      aCollection->InitTraversal();
+      for (vtkActor *anAct = aCollection->GetNextActor();
+           anAct && !isActor;
+           anAct = aCollection->GetNextActor())
+      {
+        SMESH_Actor *anActor = dynamic_cast<SMESH_Actor*>(anAct);
+        if (anActor && anActor->hasIO()) {
+          Handle(SALOME_InteractiveObject) anIO = anActor->getIO();
+          if (aViewWindow->isVisible(anIO)) {
+            if (anIO->hasEntry() && strncmp(anIO->getEntry(), meshEntry, len) == 0) {
+              myActor = anActor;
+              isActor = true;
+            }
+          }
+        }
+      }
+    }
+  }
+
+  if (isActor)
+    SMESH::SetPickable(myActor);
+
+  return isActor;
+}
+
 //=======================================================================
 //function : setShowEntityMode
 //purpose  : make shown only entity corresponding to my type
 //=======================================================================
-
 void SMESHGUI_GroupDlg::setShowEntityMode()
 {
   if ( !myMesh->_is_nil() ) {
@@ -2027,7 +2177,6 @@ void SMESHGUI_GroupDlg::setShowEntityMode()
 //function : restoreShowEntityMode
 //purpose  : restore ShowEntity mode of myActor
 //=======================================================================
-
 void SMESHGUI_GroupDlg::restoreShowEntityMode()
 {
   if ( myStoredShownEntity && !myMesh->_is_nil() ) {

src/SMESHGUI/SMESHGUI_GroupDlg.h

@@ -132,6 +132,7 @@ private:
     void setSelectionMode(int theMode);
     void updateButtons();
     void updateGeomPopup();
+    bool SetAppropriateActor();
     void setShowEntityMode();
     void restoreShowEntityMode();