Difference between revisions of "Slicer3:Python:ProcessMRMLEvents"
From Slicer Wiki
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− | = Slicer3 Python: ProcessMRMLEvents = | + | = Slicer3 Python: Using AddMRMLObserverByNumber and ProcessMRMLEvents to observe MRML events= |
In a Python Scripted Module, it is possible to observe MRML events. The observed MRML events can be fired from the MRML scene or from MRML nodes with a known ID. | In a Python Scripted Module, it is possible to observe MRML events. The observed MRML events can be fired from the MRML scene or from MRML nodes with a known ID. | ||
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<pre> | <pre> | ||
− | # The event ids can be found in the header files (f.e. Libs/MRML/vtkMRMLVolumeNode.h, Libs/MRML/vtkMRMLScene.h..) | + | # The event ids can be found in the MTML C++ header files (f.e. Libs/MRML/vtkMRMLVolumeNode.h, Libs/MRML/vtkMRMLScene.h..) |
vtkMRMLVolumeNode_ImageDataModifiedEvent = 18001 | vtkMRMLVolumeNode_ImageDataModifiedEvent = 18001 | ||
vtkMRMLScene_NodeAddedEvent = 66000 | vtkMRMLScene_NodeAddedEvent = 66000 | ||
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# first, we listen to a MRML node event | # first, we listen to a MRML node event | ||
self._scalarVolumeNode = slicer.MRMLScene.GetNodeByID("vtkMRMLScalarVolumeNode1") | self._scalarVolumeNode = slicer.MRMLScene.GetNodeByID("vtkMRMLScalarVolumeNode1") | ||
+ | self._imagedataModifiedTag = self.AddMRMLObserverByNumber(self._scalarVolumeNode,vtkMRMLVolumeNode_ImageDataModifiedEvent) | ||
# second, we listen to a MRML scene event | # second, we listen to a MRML scene event | ||
− | self. | + | self._mrmlNodeAddedTag = self.AddMRMLObserverByNumber(slicer.MRMLScene,vtkMRMLScene_NodeAddedEvent) |
[...] | [...] |
Revision as of 18:41, 24 February 2011
Home < Slicer3:Python:ProcessMRMLEventsSlicer3 Python: Using AddMRMLObserverByNumber and ProcessMRMLEvents to observe MRML events
In a Python Scripted Module, it is possible to observe MRML events. The observed MRML events can be fired from the MRML scene or from MRML nodes with a known ID.
The following example of a ScriptedModuleGUI class shows how to listen to MRML events:
# The event ids can be found in the MTML C++ header files (f.e. Libs/MRML/vtkMRMLVolumeNode.h, Libs/MRML/vtkMRMLScene.h..) vtkMRMLVolumeNode_ImageDataModifiedEvent = 18001 vtkMRMLScene_NodeAddedEvent = 66000 class AtlasCreatorGUI(ScriptedModuleGUI): [...] def AddGUIObservers(self): # first, we listen to a MRML node event self._scalarVolumeNode = slicer.MRMLScene.GetNodeByID("vtkMRMLScalarVolumeNode1") self._imagedataModifiedTag = self.AddMRMLObserverByNumber(self._scalarVolumeNode,vtkMRMLVolumeNode_ImageDataModifiedEvent) # second, we listen to a MRML scene event self._mrmlNodeAddedTag = self.AddMRMLObserverByNumber(slicer.MRMLScene,vtkMRMLScene_NodeAddedEvent) [...] def ProcessMRMLEvents(self,callerID,event,callDataID = None): ''' gets called, when an observed MRML event was fired ''' # observe MRMLNode events if callerID == "vtkMRMLScalarVolumeNode1" and event == vtkMRMLVolumeNode_ImageDataModifiedEvent: print "ImageData of vtkMRMLScalarVolumeNode1 was modified." # observe MRMLScene events if callerID == "MRMLScene" and event == vtkMRMLScene_NodeAddedEvent and callDataID: callDataAsMRMLNode = slicer.MRMLScene.GetNodeByID(callDataID) if isinstance(callDataAsMRMLNode, slicer.vtkMRMLScalarVolumeNode): print "A new vtkMRMLScalarVolumeNode was added: " + callDataID [...]