ENH: eliminated conflict between crosshair navigation and window level

Use AbortFlag to terminate events of LeftButtonPress. May need to use
a priority value if the order of observers changes.

Looked at using the GrabFocus() infrastructure but that requires having
the DisplayableManagers be a vtkInteractorObserver or a vtkAbstractWidget.
Tried to delegate to an instance of an InteractorObserver but the callback
functions would all have to be redefined/redirected. So I fell back
to simply using the AbortFlag.

svn-url: http://viewvc.slicer.org/viewvc.cgi/Slicer4?view=revision&revision=18376
git-svn-id: http://svn.slicer.org/Slicer4/trunk@18376 3bd1e089-480b-0410-8dfb-8563597acbee

Libs/MRMLDisplayableManager/vtkMRMLAbstractDisplayableManager.cxx

@@ -702,3 +702,28 @@ void vtkMRMLAbstractDisplayableManager::OnInteractorStyleEvent(int vtkNotUsed(ev
   // std::cout << "OnInteractorStyleEvent - eventid:" << eventid
   //           << ", eventname:" << vtkCommand::GetStringFromEventId(eventid) << std::endl;
 }
+
+//---------------------------------------------------------------------------
+void vtkMRMLAbstractDisplayableManager::SetInteractorStyleAbortFlag(int f)
+{
+  this->Internal->InteractorStyleCallBackCommand->SetAbortFlag(f);
+}
+
+//---------------------------------------------------------------------------
+int vtkMRMLAbstractDisplayableManager::GetInteractorStyleAbortFlag()
+{
+  return this->Internal->InteractorStyleCallBackCommand->GetAbortFlag();
+}
+
+//---------------------------------------------------------------------------
+void vtkMRMLAbstractDisplayableManager::InteractorStyleAbortFlagOn()
+{
+  this->Internal->InteractorStyleCallBackCommand->AbortFlagOn();
+}
+
+//---------------------------------------------------------------------------
+void vtkMRMLAbstractDisplayableManager::InteractorStyleAbortFlagOff()
+{
+  this->Internal->InteractorStyleCallBackCommand->AbortFlagOff();
+}
+

Libs/MRMLDisplayableManager/vtkMRMLAbstractDisplayableManager.h

@@ -173,7 +173,13 @@ class VTK_MRML_DISPLAYABLEMANAGER_EXPORT vtkMRMLAbstractDisplayableManager : pub
   /// </ul>
   /// \sa AddInteractorStyleObservableEvent RemoveInteractorStyleObservableEvent
   virtual void OnInteractorStyleEvent(int eventid);
-
+
+  /// Set the Abort flag on the InteractorStyle event callback
+  void SetInteractorStyleAbortFlag(int f);
+  int GetInteractorStyleAbortFlag();
+  void InteractorStyleAbortFlagOn();
+  void InteractorStyleAbortFlagOff();
+
 private:
 
   vtkMRMLAbstractDisplayableManager(const vtkMRMLAbstractDisplayableManager&); // Not implemented

Libs/MRMLDisplayableManager/vtkMRMLCrosshairDisplayableManager.cxx

@@ -121,6 +121,7 @@ class vtkMRMLCrosshairDisplayableManager::vtkInternal
   vtkWeakPointer<vtkMRMLLightBoxRendererManagerProxy> LightBoxRendererManagerProxy;
 };
 
+
 //---------------------------------------------------------------------------
 // vtkInternal methods
 
@@ -693,6 +694,10 @@ void vtkMRMLCrosshairDisplayableManager::OnInteractorStyleEvent(int eventid)
           if (this->Internal->PickState == vtkInternal::Over)
             {
             this->Internal->ActionState = vtkInternal::Dragging;
+
+            // Set the abort flag so that no other callbacks respond
+            // (may need to set a priority).
+            this->InteractorStyleAbortFlagOn();
             }
           }
         break;