diff --git a/src/src/Interaction/ActorDraggableInteractorStyle.cpp b/src/src/Interaction/ActorDraggableInteractorStyle.cpp
index ed8bc59..7732f8f 100644
--- a/src/src/Interaction/ActorDraggableInteractorStyle.cpp
+++ b/src/src/Interaction/ActorDraggableInteractorStyle.cpp
@@ -14,7 +14,6 @@
 #include <vtkPropCollection.h>
 #include <vtkAssemblyPath.h>
 #include <vtkRenderer.h>
-#include <vtkImageSliceMapper.h>
 #include <vtkCamera.h>
 #include <vtkCellPicker.h>
 #include <vtkCallbackCommand.h>
@@ -544,25 +543,7 @@ void ActorDraggableInteractorStyle::SetCurrentImageNumber(int i) {
 }
 
 void ActorDraggableInteractorStyle::DispatchEvent() {
-    switch (this->State) {
-        case VTKIS_SLICE:
 
-            if (this->HandleObservers) {
-                //double check
-                if (!this->CurrentImageSlice) {
-                    this->SetCurrentImageNumber(this->CurrentImageNumber);
-                }
-                if (!this->CurrentImageSlice) return;
-                vtkImageSliceMapper *mapper = vtkImageSliceMapper::SafeDownCast(this->CurrentImageSlice->GetMapper());
-                int slice[1] = {mapper ? mapper->GetSliceNumber() : -1};
-                //鼠标滑动不一定能造成翻页！！！所以需要进行一次判定
-                if (slice[0] != lastslice) {
-                    this->InvokeEvent(DraggableStyleEvents::SlicedEvent, slice);
-                    lastslice = slice[0];
-                }
-                break;
-            }
-    }
 }
 
 
diff --git a/src/src/Rendering/infinitiViewer.cxx b/src/src/Rendering/infinitiViewer.cxx
index 06574ab..6bb5253 100644
--- a/src/src/Rendering/infinitiViewer.cxx
+++ b/src/src/Rendering/infinitiViewer.cxx
@@ -358,9 +358,6 @@ infinitiViewer::infinitiViewer()
 
     infinitiViewer::InstallPipeline();
 
-	this->AddObserver(infinitiViewerEvents::SlicedEvent, this, &infinitiViewer::LoadMeasures);
-	this->AddObserver(infinitiViewerEvents::SlicedEvent, this, &infinitiViewer::updateTopLeftCornerInfo);
-
 	uintptr_t handler = reinterpret_cast<uintptr_t>(this);
 	sprintf(SOP_UID, "%llu", handler);
 }
@@ -611,8 +608,8 @@ void infinitiViewer::SetSlice(int slice)
     }
 
 	this->Render();
-
-	this->InvokeEvent(infinitiViewerEvents::SlicedEvent, nullptr);
+    if (InteractorStyle)
+	    InteractorStyle->InvokeEvent(ActorDraggableInteractorStyle::SlicedEvent, &this->Slice);
 }
 
 int infinitiViewer::GetSlice() {
@@ -844,6 +841,7 @@ void infinitiViewer::InstallPipeline()
 			this->InteractorStyle->AddObserver(ActorDraggableInteractorStyle::DraggableStyleEvents::DeleteMeasureEvent, this, &infinitiViewer::RemoveMeasures);
 			this->InteractorStyle->AddObserver(ActorDraggableInteractorStyle::DraggableStyleEvents::SliceEvent, this, &infinitiViewer::ChangeSlice);
 			this->InteractorStyle->AddObserver(ActorDraggableInteractorStyle::DraggableStyleEvents::SlicedEvent, this, &infinitiViewer::LoadMeasures);
+            InteractorStyle->AddObserver(ActorDraggableInteractorStyle::SlicedEvent, this, &infinitiViewer::updateTopLeftCornerInfo);
 
 			//for convert vtkEvent to Qt signal
 			this->InteractorStyle->AddObserver(ActorDraggableInteractorStyle::DraggableStyleEvents::SlicedEvent, this, &infinitiViewer::raiseEvent);
diff --git a/src/src/Rendering/infinitiViewer.h b/src/src/Rendering/infinitiViewer.h
index cec9ca8..46bbcbb 100644
--- a/src/src/Rendering/infinitiViewer.h
+++ b/src/src/Rendering/infinitiViewer.h
@@ -46,12 +46,6 @@ public:
 	vtkTypeMacro(infinitiViewer, vtkObject);
 	void PrintSelf(ostream& os, vtkIndent indent) override;
 
-
-	enum infinitiViewerEvents
-	{
-		SlicedEvent = vtkCommand::UserEvent + 500,
-	};
-
 	//vtkGetMacro(m_cornerAnnotation, vtkCornerAnnotation);
 	vtkCornerAnnotation* GetvtkCornerAnnotation()
 	{
@@ -342,7 +336,7 @@ protected:
 	vtkImageSliceMapper* ImageMapper;
 	vtkImageSliceMapper* FusionMapper;
 	vtkRenderWindowInteractor* Interactor;
-    ActorDraggableInteractorStyle* InteractorStyle;
+    ActorDraggableInteractorStyle* InteractorStyle = nullptr;
 	vtkTextActor* OpacityActor;
 	vtkCornerAnnotation* cornerAnnotation;