Slicer3:Python:ProcessMRMLEvents - Revision history

Haehn: /* Slicer3 Python: Using AddMRMLObserverByNumber and ProcessMRMLEvents to observe MRML events */

2011-02-24T18:49:28Z

Slicer3 Python: Using AddMRMLObserverByNumber and ProcessMRMLEvents to observe MRML events

Haehn: /* Slicer3 Python: ProcessMRMLEvents */

2011-02-24T18:41:48Z

Slicer3 Python: ProcessMRMLEvents

Haehn: /* Slicer3 Python: ProcessMRMLEvents */

2011-02-24T18:40:01Z

Slicer3 Python: ProcessMRMLEvents

Haehn: Created page with '== Slicer3 Python: ProcessMRMLEvents == 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 MRM…'

2011-02-24T18:38:45Z

Created page with '== Slicer3 Python: ProcessMRMLEvents == 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 MRM…'

New page

== Slicer3 Python: ProcessMRMLEvents ==

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:

<pre>
# The event ids can be found in the 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")

# second, we listen to a MRML scene event
self._imagedataModifiedTag = self.AddMRMLObserverByNumber(self._scalarVolumeNode,vtkMRMLVolumeNode_ImageDataModifiedEvent)

[...]

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

[...]

</pre>

@@ Line 6: / Line 6: @@
 <pre>
-# The event ids can be found in the MTML C++ header files (f.e. Libs/MRML/vtkMRMLVolumeNode.h, Libs/MRML/vtkMRMLScene.h..)
+# The event ids can be found in the MRML C++ header files (f.e. Libs/MRML/vtkMRMLVolumeNode.h, Libs/MRML/vtkMRMLScene.h..)
 vtkMRMLVolumeNode_ImageDataModifiedEvent = 18001
 vtkMRMLScene_NodeAddedEvent = 66000

← Older revision		Revision as of 18:40, 24 February 2011
Line 1:		Line 1:
−	== Slicer3 Python: ProcessMRMLEvents ==	+	= Slicer3 Python: ProcessMRMLEvents =

	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.

@@ Line 1: / Line 1: @@
-= 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.
@@ Line 6: / Line 6: @@
 <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
 vtkMRMLScene_NodeAddedEvent = 66000
@@ Line 18: / Line 18: @@
          # first, we listen to a MRML node event
          self._scalarVolumeNode = slicer.MRMLScene.GetNodeByID("vtkMRMLScalarVolumeNode1")
          # second, we listen to a MRML scene event
-         self._imagedataModifiedTag = self.AddMRMLObserverByNumber(self._scalarVolumeNode,vtkMRMLVolumeNode_ImageDataModifiedEvent)
+         self._mrmlNodeAddedTag = self.AddMRMLObserverByNumber(slicer.MRMLScene,vtkMRMLScene_NodeAddedEvent)
      [...]