1.主要的类

• vtkMRMLLayoutNode: 描述视图布局的节点，一个场景只存在一个布局节点。
• vtkMRMLLayoutLogic: 控制/观测图层节点，如果需要会自动创建视图节点（在布局节点描述中引用，而不是场景中引用）。
• vtkMRMLAbstractViewNode: 所有视图节点的抽象类(例如vtkMRMLSliceNode, vtkMRMLViewNode, vtkMRMLChartViewNode) 。
• ctkLayoutManager: 将布局描述（XML）转换成Qt布局的机制。
• qMRMLLayoutManager:ctkLayoutManager 的专用版本，只处理MRML的视图与属性。
• qSlicerLayoutManager: qMRMLLayoutManager 的专用版本，处理Slicer的特定行为。Slicer图层管理器可以通过qSlicerApplication访问。

2.如何注册一个新的布局layout？

qMRMLLayoutSliceViewFactory* mrmlSliceViewFactory =qobject_cast<qMRMLLayoutSliceViewFactory*>(d->app->layoutManager()->mrmlViewFactory("vtkMRMLSliceNode"));qSlicerCustomLayoutSliceViewFactory* customSliceViewFactory =new qSlicerCustomLayoutSliceViewFactory(d->app->layoutManager());customSliceViewFactory->setSliceLogics(mrmlSliceViewFactory->sliceLogics());d->app->layoutManager()->unregisterViewFactory(mrmlSliceViewFactory);d->app->layoutManager()->registerViewFactory(customSliceViewFactory);

3.View XML(Layout description) elements

vtkMRMLLayoutNode* layoutNode = vtkMRMLLayoutNode::SafeDownCast(this->mrmlScene()->GetSingletonNode("vtkMRMLLayoutNode","vtkMRMLLayoutNode")); std::string layoutDescription = layoutNode->GetLayoutDescription(index);采用SetLayoutDescription方法可以修改布局描述XML。

4.示例：自定义布局 qSlicerCustomLayoutSlicerViewFactory

#ifndef __qSlicerAstroVolumeLayoutSliceViewFactory_h #define __qSlicerAstroVolumeLayoutSliceViewFactory_h// SlicerQt includes #include "qMRMLLayoutManager.h" #include "qMRMLLayoutManager_p.h"// VTK includes #include <vtkWeakPointer.h> #include "qSlicerAstroVolumeModuleExport.h"///class qSlicerAstroVolumeLayoutSliceViewFactoryPrivate;/// \ingroup Slicer_QtModules_AstroVolume class Q_SLICER_QTMODULES_ASTROVOLUME_EXPORT qSlicerAstroVolumeLayoutSliceViewFactory: public qMRMLLayoutSliceViewFactory {Q_OBJECT public:typedef qMRMLLayoutSliceViewFactory Superclass;qSlicerAstroVolumeLayoutSliceViewFactory(QObject* parent);virtual ~qSlicerAstroVolumeLayoutSliceViewFactory();virtual QString viewClassName()const;protected:virtual QWidget* createViewFromNode(vtkMRMLAbstractViewNode* viewNode);virtual void deleteView(vtkMRMLAbstractViewNode* viewNode);private:Q_DECLARE_PRIVATE(qSlicerAstroVolumeLayoutSliceViewFactory);Q_DISABLE_COPY(qSlicerAstroVolumeLayoutSliceViewFactory); };#endif
//----------------------------------------------------------------------------- qSlicerAstroVolumeLayoutSliceViewFactory::qSlicerAstroVolumeLayoutSliceViewFactory(QObject* _parent): Superclass(_parent) { }//----------------------------------------------------------------------------- qSlicerAstroVolumeLayoutSliceViewFactory::~qSlicerAstroVolumeLayoutSliceViewFactory() { } //----------------------------------------------------------------------------- QWidget* qSlicerAstroVolumeLayoutSliceViewFactory::createViewFromNode(vtkMRMLAbstractViewNode* viewNode) {if (!this->layoutManager() || !viewNode){// can't create a slice widget if there is no parent widgetQ_ASSERT(viewNode);return 0;}// there is a unique slice widget per nodeQ_ASSERT(!this->viewWidget(viewNode));qMRMLSliceAstroWidget * sliceWidget = new qMRMLSliceAstroWidget(this->layoutManager()->viewport());sliceWidget->sliceController()->setControllerButtonGroup(this->SliceControllerButtonGroup);QString sliceLayoutName(viewNode->GetLayoutName());QString sliceViewLabel(viewNode->GetLayoutLabel());vtkMRMLSliceNode* sliceNode = vtkMRMLSliceNode::SafeDownCast(viewNode);QColor sliceLayoutColor = QColor::fromRgbF(sliceNode->GetLayoutColor()[0],sliceNode->GetLayoutColor()[1],sliceNode->GetLayoutColor()[2]);sliceWidget->setSliceViewName(sliceLayoutName);sliceWidget->setObjectName(QString("qMRMLSliceWidget" + sliceLayoutName));sliceWidget->setSliceViewLabel(sliceViewLabel);sliceWidget->setSliceViewColor(sliceLayoutColor);sliceWidget->setMRMLScene(this->mrmlScene());sliceWidget->setMRMLSliceNode(sliceNode);sliceWidget->setSliceLogics(this->sliceLogics());this->sliceLogics()->AddItem(sliceWidget->sliceLogic());return sliceWidget; }void qSlicerAstroVolumeLayoutSliceViewFactory::deleteView(vtkMRMLAbstractViewNode *viewNode) {qMRMLSliceAstroWidget* sliceWidget =qobject_cast<qMRMLSliceAstroWidget*>(this->viewWidget(viewNode));if (sliceWidget){this->sliceLogics()->RemoveItem(sliceWidget->sliceLogic());}this->Superclass::deleteView(viewNode); }QString qSlicerAstroVolumeLayoutSliceViewFactory::viewClassName() const {return "vtkMRMLSliceNode"; }

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