ENH: The interactor now keeps track of any changes to the current cursor

of the renderwindow.  This makes interaction with widgets that change
the cursor much nicer.

Wrapping/Python/vtk/wx/wxVTKRenderWindowInteractor.py

@@ -184,6 +184,8 @@ class wxVTKRenderWindowInteractor(baseClass):
         self._Iren.SetRenderWindow( vtk.vtkRenderWindow() )
         self._Iren.AddObserver('CreateTimerEvent', self.CreateTimer)
         self._Iren.AddObserver('DestroyTimerEvent', self.DestroyTimer)
+        self._Iren.GetRenderWindow().AddObserver('CursorChangedEvent',
+                                                 self.CursorChangedEvent)
 
         try:
             self._Iren.GetRenderWindow().SetSize(size.width, size.height)
@@ -206,6 +208,20 @@ class wxVTKRenderWindowInteractor(baseClass):
 
         # set when we have captured the mouse.
         self._own_mouse = False
+
+        # A mapping for cursor changes.
+        self._cursor_map = {0: wx.CURSOR_ARROW, # VTK_CURSOR_DEFAULT
+                            1: wx.CURSOR_ARROW, # VTK_CURSOR_ARROW
+                            2: wx.CURSOR_SIZENESW, # VTK_CURSOR_SIZENE
+                            3: wx.CURSOR_SIZENWSE, # VTK_CURSOR_SIZENWSE
+                            4: wx.CURSOR_SIZENESW, # VTK_CURSOR_SIZESW
+                            5: wx.CURSOR_SIZENWSE, # VTK_CURSOR_SIZESE
+                            6: wx.CURSOR_SIZENS, # VTK_CURSOR_SIZENS
+                            7: wx.CURSOR_SIZEWE, # VTK_CURSOR_SIZEWE
+                            8: wx.CURSOR_SIZING, # VTK_CURSOR_SIZEALL
+                            9: wx.CURSOR_HAND, # VTK_CURSOR_HAND
+                            10: wx.CURSOR_CROSS, # VTK_CURSOR_CROSSHAIR
+                           }
         
     def BindEvents(self):
         """Binds all the necessary events for navigation, sizing,
@@ -237,7 +253,6 @@ class wxVTKRenderWindowInteractor(baseClass):
         
         self.Bind(wx.EVT_SIZE, self.OnSize)
 
-
     def __getattr__(self, attr):        
         """Makes the object behave like a
         vtkGenericRenderWindowInteractor.
@@ -260,7 +275,35 @@ class wxVTKRenderWindowInteractor(baseClass):
         """The timer is a one shot timer so will expire automatically.
         """
         return 1
-    
+   
+    def _CursorChangedEvent(self, obj, evt):
+        """Change the wx cursor if the renderwindow's cursor was
+        changed. 
+        """
+        cur = self._cursor_map[obj.GetCurrentCursor()]
+        c = wx.StockCursor(cur)
+        self.SetCursor(c)
+
+    def CursorChangedEvent(self, obj, evt):
+        """Called when the CursorChangedEvent fires on the render
+        window."""
+        # This indirection is needed since when the event fires, the
+        # current cursor is not yet set so we defer this by which time
+        # the current cursor should have been set.
+        wx.CallAfter(self._CursorChangedEvent, obj, evt)
+
+    def HideCursor(self):
+        """Hides the cursor."""
+        c = wx.StockCursor(wx.CURSOR_BLANK)
+        self.SetCursor(c)
+
+    def ShowCursor(self):
+        """Shows the cursor."""
+        rw = self._Iren.GetRenderWindow()
+        cur = self._cursor_map[rw.GetCurrentCursor()]
+        c = wx.StockCursor(cur)
+        self.SetCursor(c)
+
     def GetDisplayId(self):
         """Function to get X11 Display ID from WX and return it in a format
         that can be used by VTK Python.