diff --git a/invesalius/data/styles.py b/invesalius/data/styles.py
index f8e547c..1eabd71 100644
--- a/invesalius/data/styles.py
+++ b/invesalius/data/styles.py
@@ -77,12 +77,12 @@ class CrossInteractorStyle(RightZoomInteractorStyle):
     """
     Interactor style responsible for the Cross.
     """
-    def __init__(self, orientation, slice_data):
+    def __init__(self, viewer):
         RightZoomInteractorStyle.__init__(self)
 
-        self.orientation = orientation
-        self.slice_actor = slice_data.actor
-        self.slice_data = slice_data
+        self.orientation = viewer.orientation
+        self.slice_actor = viewer.slice_data.actor
+        self.slice_data = viewer.slice_data
 
         self.picker = vtk.vtkWorldPointPicker()
 
@@ -183,14 +183,16 @@ class WWWLInteractorStyle(RightZoomInteractorStyle):
     """
     Interactor style responsible for Window Level & Width functionality.
     """
-    def __init__(self, ww, wl):
+    def __init__(self, viewer):
         RightZoomInteractorStyle.__init__(self)
 
+        self.viewer =  viewer
+
         self.last_x = 0
         self.last_y = 0
 
-        self.acum_achange_window = ww
-        self.acum_achange_level = wl
+        self.acum_achange_window = viewer.slice_.window_width
+        self.acum_achange_level = viewer.slice_.window_level
 
         self.AddObserver("MouseMoveEvent", self.OnWindowLevelMove)
         self.AddObserver("LeftButtonPressEvent", self.OnWindowLevelClick)
@@ -222,16 +224,20 @@ class WWWLInteractorStyle(RightZoomInteractorStyle):
         iren = obj.GetInteractor()
         self.last_x, self.last_y = iren.GetLastEventPosition()
 
+        self.acum_achange_window = viewer.slice_.window_width
+        self.acum_achange_level = viewer.slice_.window_level
+
 
 class LinearMeasureInteractorStyle(RightZoomInteractorStyle):
     """
     Interactor style responsible for insert linear measurements.
     """
-    def __init__(self, orientation, slice_data):
+    def __init__(self, viewer):
         RightZoomInteractorStyle.__init__(self)
 
-        self.orientation = orientation
-        self.slice_data = slice_data
+        self.viewer = viewer
+        self.orientation = viewer.orientation
+        self.slice_data = viewer.slice_data
 
         self.picker = vtk.vtkCellPicker()
 
@@ -249,18 +255,19 @@ class LinearMeasureInteractorStyle(RightZoomInteractorStyle):
                                   ((x, y,z), const.LINEAR,
                                    ORIENTATIONS[self.orientation],
                                    slice_number))
-            Publisher.sendMessage('Update slice viewer')
+            self.viewer.interactor.Render()
 
 
 class AngularMeasureInteractorStyle(RightZoomInteractorStyle):
     """
     Interactor style responsible for insert angular measurements.
     """
-    def __init__(self, orientation, slice_data):
+    def __init__(self, viewer):
         RightZoomInteractorStyle.__init__(self)
 
-        self.orientation = orientation
-        self.slice_data = slice_data
+        self.viewer = viewer
+        self.orientation = viewer.orientation
+        self.slice_data = viewer.slice_data
 
         self.picker = vtk.vtkCellPicker()
 
@@ -278,7 +285,7 @@ class AngularMeasureInteractorStyle(RightZoomInteractorStyle):
                                   ((x, y,z), const.ANGULAR,
                                    ORIENTATIONS[self.orientation],
                                    slice_number))
-            Publisher.sendMessage('Update slice viewer')
+            self.viewer.interactor.Render()
 
 
 class PanMoveInteractorStyle(RightZoomInteractorStyle):
diff --git a/invesalius/data/viewer_slice.py b/invesalius/data/viewer_slice.py
index 010e940..6191c8e 100755
--- a/invesalius/data/viewer_slice.py
+++ b/invesalius/data/viewer_slice.py
@@ -176,8 +176,7 @@ class Viewer(wx.Panel):
 
     def SetInteractorStyle(self, state):
         if state == const.SLICE_STATE_CROSS:
-            style = styles.CrossInteractorStyle(self.orientation,
-                                                self.slice_data)
+            style = styles.CrossInteractorStyle(self)
             self.style = style
             self.interactor.SetInteractorStyle(style)
             self.interactor.Render()
@@ -197,22 +196,19 @@ class Viewer(wx.Panel):
             self.on_wl = True
             self.wl_text.Show()
 
-            ww = sl.Slice().window_width
-            wl = sl.Slice().window_level
-
-            style = styles.WWWLInteractorStyle(ww, wl)
+            style = styles.WWWLInteractorStyle(self)
             self.style = style
             self.interactor.SetInteractorStyle(style)
             self.interactor.Render()
 
         elif state == const.STATE_MEASURE_DISTANCE:
-            style = styles.LinearMeasureInteractorStyle(self.orientation, self.slice_data)
+            style = styles.LinearMeasureInteractorStyle(self)
             self.style = style
             self.interactor.SetInteractorStyle(style)
             self.interactor.Render()
 
         elif state == const.STATE_MEASURE_ANGLE:
-            style = styles.AngularMeasureInteractorStyle(self.orientation, self.slice_data)
+            style = styles.AngularMeasureInteractorStyle(self)
             self.style = style
             self.interactor.SetInteractorStyle(style)
             self.interactor.Render()
@@ -263,11 +259,6 @@ class Viewer(wx.Panel):
                                 "EnterEvent": self.OnEnterInteractor,
                                 "LeaveEvent": self.OnLeaveInteractor
                                 },
-                      const.SLICE_STATE_SCROLL:
-                                {
-                                "MouseMoveEvent": self.OnChangeSliceMove,
-                                "LeftButtonPressEvent": self.OnChangeSliceClick,
-                                },
                       const.STATE_DEFAULT:
                                 {
                                 },
@@ -380,32 +371,6 @@ class Viewer(wx.Panel):
         self.SetWLText(window, level)
         Publisher.sendMessage('Update all slice')
 
-
-    def OnChangeSliceMove(self, evt, obj):
-        if (self.left_pressed):
-            min = 0
-            max = self.slice_.GetMaxSliceNumber(self.orientation)
-    
-            if (self.left_pressed):
-                position = self.interactor.GetLastEventPosition()
-                scroll_position = self.scroll.GetThumbPosition()
-    
-                if (position[1] > self.last_position) and\
-                                (self.acum_achange_slice > min):
-                    self.acum_achange_slice -= 1
-                elif(position[1] < self.last_position) and\
-                                (self.acum_achange_slice < max):
-                     self.acum_achange_slice += 1
-                self.last_position = position[1]
-    
-                self.scroll.SetThumbPosition(self.acum_achange_slice)
-                self.OnScrollBar()
-
-    def OnChangeSliceClick(self, evt, obj):
-        position = list(self.interactor.GetLastEventPosition())
-        self.acum_achange_slice = self.scroll.GetThumbPosition()
-        self.last_position = position[1]
-
     def OnPanMove(self, evt, obj):
         mouse_x, mouse_y = self.interactor.GetLastEventPosition()
         ren = self.interactor.FindPokedRenderer(mouse_x, mouse_y)
--
libgit2 0.21.2