Observing and tracking ScriptedLoadableModuleLogic

dominicrushforth · September 3, 2018, 3:25pm

I am doing some image processing in a ScriptedLoadableModuleLogic module. I would like to set up a progress bar to show that the logic is running and connect to another routine on completion.

I have been trying to emulate the qSlicerCLIProgressBar with an observer like that below to trigger the status updates and completion routine…

self.cliNodeObserverTag = self.cliNode.AddObserver(‘ModifiedEvent’, self.onCLIEvent)

…however I’ve not been having much success.

I suspect I may be over complicating the problem and that there may be a much more straighforward solution. I’d be grateful for any suggestions

pieper · September 3, 2018, 4:36pm

The CLI runs in a separate process, so there the progress update is event driven/asynchronous.

For a scripted module running in the main thread, you need to update the progress manually based on steps in your computation, something like what is done in the DICOM module:

github.com

Slicer/Slicer/blob/master/Modules/Scripted/DICOMLib/DICOMWidgets.py#L720-L746


progress = slicer.util.createProgressDialog(parent=self, value=0, maximum=len(plugins))


for step, pluginClass in enumerate(plugins):
  if not self.pluginInstances.has_key(pluginClass):
    self.pluginInstances[pluginClass] = slicer.modules.dicomPlugins[pluginClass]()
  plugin = self.pluginInstances[pluginClass]
  if progress.wasCanceled:
    break
  progress.labelText = '\nChecking %s' % pluginClass
  slicer.app.processEvents()
  progress.setValue(step)
  slicer.app.processEvents()
  try:
    loadablesByPlugin[plugin] = plugin.examineForImport(fileLists)
    # If regular method is not overridden (so returns empty list), try old function
    # Ensuring backwards compatibility: examineForImport used to be called examine
    if not loadablesByPlugin[plugin]:
      loadablesByPlugin[plugin] = plugin.examine(fileLists)
    loadEnabled = loadEnabled or loadablesByPlugin[plugin] != []
  except Exception, e:

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Observing and tracking ScriptedLoadableModuleLogic

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