ViewBox will now correctly auto-range when an item's position or transform changes.

graphicsItems/GraphicsItem.py

@@ -434,3 +434,17 @@ class GraphicsItem(object):
         Called whenever the transformation matrix of the view has changed.
         """
         pass
+    
+    #def prepareGeometryChange(self):
+        #self._qtBaseClass.prepareGeometryChange(self)
+        #self.informViewBoundsChanged()
+        
+    def informViewBoundsChanged(self):
+        """
+        Inform this item's container ViewBox that the bounds of this item have changed.
+        This is used by ViewBox to react if auto-range is enabled.
+        """
+        view = self.getViewBox()
+        if view is not None and hasattr(view, 'implements') and view.implements('ViewBox'):
+            view.itemBoundsChanged(self)  ## inform view so it can update its range if it wants
+        

graphicsItems/GraphicsObject.py

@@ -11,10 +11,13 @@ class GraphicsObject(GraphicsItem, QtGui.QGraphicsObject):
     _qtBaseClass = QtGui.QGraphicsObject
     def __init__(self, *args):
         QtGui.QGraphicsObject.__init__(self, *args)
+        self.setFlag(self.ItemSendsGeometryChanges)
         GraphicsItem.__init__(self)
         
     def itemChange(self, change, value):
         ret = QtGui.QGraphicsObject.itemChange(self, change, value)
         if change in [self.ItemParentHasChanged, self.ItemSceneHasChanged]:
             self._updateView()
+        if change in [self.ItemPositionHasChanged, self.ItemTransformHasChanged]:
+            self.informViewBoundsChanged()
         return ret

graphicsItems/ViewBox/ViewBox.py

@@ -109,6 +109,7 @@ class ViewBox(GraphicsWidget):
 
             'background': None,
         }
+        self._updatingRange = False  ## Used to break recursive loops. See updateAutoRange.
         
         
         self.setFlag(self.ItemClipsChildrenToShape)
@@ -340,6 +341,7 @@ class ViewBox(GraphicsWidget):
         ============= =====================================================================
         
         """
+        
         changes = {}
         
         if rect is not None:
@@ -471,6 +473,7 @@ class ViewBox(GraphicsWidget):
         #if not enable:
             #import traceback
             #traceback.print_stack()
+            
         if enable is True:
             enable = 1.0
         
@@ -520,6 +523,14 @@ class ViewBox(GraphicsWidget):
             self.updateAutoRange()
 
     def updateAutoRange(self):
+        ## Break recursive loops when auto-ranging.
+        ## This is needed because some items change their size in response 
+        ## to a view change.
+        if self._updatingRange:
+            return
+        
+        self._updatingRange = True
+        try:
             targetRect = self.viewRange()
             if not any(self.state['autoRange']):
                 return
@@ -588,6 +599,8 @@ class ViewBox(GraphicsWidget):
             args['disableAutoRange'] = False
             #self.setRange(xRange=targetRect[0], yRange=targetRect[1], padding=0, disableAutoRange=False)
             self.setRange(**args)
+        finally:
+            self._updatingRange = False
         
     def setXLink(self, view):
         """Link this view's X axis to another view. (see LinkView)"""