ENH: adding support for slicer.app.openNodeModule by implementing req…

…uired methods

- a confidence value of 0.7 is returned if parameter node belongs to Elastix and otherwise 0.0
- Slicer will be able to identify and open the corresponding user interface for
  directly editing the parameters saved in the parameter node

Elastix/Elastix.py

@@ -21,6 +21,7 @@ def __init__(self, parent):
     ScriptedLoadableModule.__init__(self, parent)
     self.parent.title = "General Registration (Elastix)"
     self.parent.categories = ["Registration"]
+    self.parent.associatedNodeTypes = ["vtkMRMLScriptedModuleNode"]
     self.parent.dependencies = []
     self.parent.contributors = ["Andras Lasso (PerkLab - Queen's University), Christian Herz (CHOP)"]
     self.parent.helpText = """Align volumes based on image content using <a href="http://elastix.isi.uu.nl/">Elastix medical image registration toolbox</a>.
@@ -54,6 +55,13 @@ def __init__(self, parent=None):
     self._parameterNode = None
     self._updatingGUIFromParameterNode = False
 
+  def setEditedNode(self, node, role='', context=''):
+    self.setParameterNode(node)
+    return node is not None
+
+  def nodeEditable(self, node):
+    return 0.7 if node is not None and node.GetAttribute('ModuleName') == self.moduleName else 0.0
+
   def setup(self):
     ScriptedLoadableModuleWidget.setup(self)
 
@@ -127,7 +135,7 @@ def onSceneEndClose(self, caller, event):
       self.initializeParameterNode()
 
   def initializeParameterNode(self):
-    self.setParameterNode(self.logic.getParameterNode())
+    self.setParameterNode(self.logic.getParameterNode() if not self._parameterNode else self._parameterNode)
 
   def setParameterNode(self, inputParameterNode):
     if inputParameterNode: