https://www.slicer.org/w/index.php?action=history&feed=atom&title=Documentation%2FLabs%2FPythonObserverCallbacks 2026-05-04T06:44:33Z Revision history for this page on the wiki MediaWiki 1.33.0 https://www.slicer.org/w/index.php?title=Documentation/Labs/PythonObserverCallbacks&diff=40576&oldid=prev 2014-12-28T20:43:12Z

<p>Created page with &#039;Currently the syntax for defining observer callback functions with CallData argument is too comples, see [[Documentation/Nightly/Developers/FAQ/Python_Scripting#How_can_I_access_…&#039;</p> <p><b>New page</b></p><div>Currently the syntax for defining observer callback functions with CallData argument is too comples, see [[Documentation/Nightly/Developers/FAQ/Python_Scripting#How_can_I_access_callData_argument_in_a_VTK_object_observer_callback_function]]<br /> <br /> The remaining limitation is that mix-ins can only be used in helper classes (such as [https://github.com/Slicer/Slicer/blob/1c10718f30b8f15a5f6c0602e96add70c1898df6/Modules/Scripted/EditorLib/EditBox.py#L2 here]) but not in scripted loadable module classes.<br /> <br /> We need to fix:<br /> * the base class so that it derives from 'object' and be a [https://docs.python.org/2/reference/datamodel.html#newstyle &quot;new style&quot; python class] and <br /> * the c++ proxy class so that we can understand new style classes. See [https://github.com/Slicer/Slicer/blob/master/Base/QTGUI/qSlicerScriptedLoadableModuleWidget.cxx qSlicerScriptedLoadableModuleWidget.cxx] and [http://stackoverflow.com/questions/18757186/pyinstance-newraw-with-old-and-new-style-classes pyinstance-newraw-with-old-and-new-style-classes]</div>

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