AHM2012-Slicer-Architecture

Modularization Object Specialization

• Slicer is build on top re-usable and tested libraries.

Displayable Managers

• Displayable manager: Specialized logic handling both RenderWindow <-> MRML and RenderWindow <-> Logic interactions.

• Motivation: Have a well-designed mechanism to ...
  • ...represent MRML node within a Renderer/RenderWindow.
  • ... handle mouse/keyboard interaction.
  • ... synchronize widget across different views.

• Overview:
  • Each time a viewer is instantiated, it asks a factory to provide him with a DisplayableManagerGroup.
  • DisplayableManagerGroup contain a list of DisplayableManager
  • Each DisplayableManager is associated with Renderer + InteractorStyle

• DisplayableManager
  • Currently, there are two type of DisplayableManager: ThreeD and Slice DisplayableManager - Similar API.
  • Both derive from vtkMRMLAbstractDisplayableManager.
  • ThreeDDisplayableManager [1]: deals with MRMLViewNode / ThreeDInteractorStyle
  • SliceDisplayableManager [2]: deals with MRMLSliceNode / SliceInteractorStyle

• Factories:
  • vtkMRMLThreeDViewDisplayableManagerFactory
  • vtkMRMLSliceViewDisplayableManagerFactory

• DisplayableManager within Module
  • Module can also register DisplayableManager. See qSlicerAnnotationsModule.cxx#L65

• DisplayableManager and Python
  • Mechanism to load python based DisplayableManager
  • Achieved using vtkMRMLScriptedDisplayableManager

• List of DisplayableManager (available in Libs/MRML/DisplayableManager directory)
  • vtkMRMLCameraDisplayableManager
  • vtkMRMLCrosshairDisplayableManager
  • vtkMRMLModelDisplayableManager
  • vtkMRMLModelSliceDisplayableManager
  • vtkMRMLThreeDReformatDisplayableManager
  • vtkMRMLViewDisplayableManager
  • vtkMRMLVolumeGlyphSliceDisplayableManager

Views and Layouts

• Implemented layouts
  • conventionalView
  • fourUpView
  • oneUp3DView
  • oneUpRedView
  • oneUpYellowView
  • oneUpGreenView
  • tabbed3DView
  • tabbedSliceView
  • dual3DView
  • triple3DView
  • conventionalWidescreenView
  • threeOverThreeView
  • fourOverFourView
  • compareView

• Concept
  • Management of Layout and their associated View have been revisited.
  • Layout are now described using a simple XML description. See vtkMRMLLayoutLogic

const char* triple3DEndoscopyView =
  "<layout type=\"vertical\" split=\"true\" >"
  " <item>"
  "  <view class=\"vtkMRMLViewNode\">"
  "   <property name=\"viewlabel\" action=\"default\">1</property>"
  "  </view>"
  " </item>"
  " <item>"
  "  <layout type=\"horizontal\">"
  "   <item>"
  "    <view class=\"vtkMRMLViewNode\" type=\"secondary\">"
  "     <property name=\"viewlabel\" action=\"default\">2</property>"
  "    </view>"
  "   </item>"
  "   <item>"
  "    <view class=\"vtkMRMLViewNode\" type=\"endoscopy\">"
  "     <property name=\"viewlabel\" action=\"default\">3</property>"
  "    </view>"
  "   </item>"
  "  </layout>"
  " </item>"
  "</layout>";

• MRMLLayoutManager
  • Bridge between MRML nodes, Layout description and corresponding Widgets layout.
  • Aggregates a MRMLLayoutLogic
  • Based on ctkLayoutManager

• vtkMRMLLayoutLogic
  • Observes LayoutNode and ViewNodes
  • Ensures that at least one 3D view and three slice views are always in the MRML scene (after a scene is closed or imported).
  • Keeps an up-to-date list of the different MRML view nodes (3D, slice ...) that are mapped into a given layout.

• What's next
  • API to dynamically update a given layout description