Signal cleanup:

- Renamed GraphicsView signals to avoid collision with ViewBox signals that
  are wrapped in PlotWidget: sigRangeChanged => sigDeviceRangeChanged and
  sigTransformChanged => sigDeviceTransformChanged.
- All signal disconnections that catch TypeError now also catch RuntimeError
  for pyside compatibility.

CHANGELOG

@@ -12,6 +12,9 @@ pyqtgraph-0.9.9  [unreleased]
     - ImageItem is faster by avoiding makeQImage(transpose=True)
     - ComboBox will raise error when adding multiple items of the same name
     - ArrowItem.setStyle now updates style options rather than replacing them 
+    - Renamed GraphicsView signals to avoid collision with ViewBox signals that
+      are wrapped in PlotWidget: sigRangeChanged => sigDeviceRangeChanged and
+      sigTransformChanged => sigDeviceTransformChanged.
 
   New Features:
     - Added ViewBox.setLimits() method

pyqtgraph/flowchart/Flowchart.py

@@ -227,18 +227,11 @@ class Flowchart(Node):
     def nodeClosed(self, node):
         del self._nodes[node.name()]
         self.widget().removeNode(node)
-        try:
+        for signal in ['sigClosed', 'sigRenamed', 'sigOutputChanged']:
-            node.sigClosed.disconnect(self.nodeClosed)
+            try:
-        except TypeError:
+                getattr(node, signal).disconnect(self.nodeClosed)
-            pass
+            except (TypeError, RuntimeError):
-        try:
+                pass
-            node.sigRenamed.disconnect(self.nodeRenamed)
-        except TypeError:
-            pass
-        try:
-            node.sigOutputChanged.disconnect(self.nodeOutputChanged)
-        except TypeError:
-            pass
         self.sigChartChanged.emit(self, 'remove', node)
         
     def nodeRenamed(self, node, oldName):
@@ -769,7 +762,7 @@ class FlowchartCtrlWidget(QtGui.QWidget):
             #self.disconnect(item.bypassBtn, QtCore.SIGNAL('clicked()'), self.bypassClicked)
             try:
                 item.bypassBtn.clicked.disconnect(self.bypassClicked)
-            except TypeError:
+            except (TypeError, RuntimeError):
                 pass
             self.ui.ctrlList.removeTopLevelItem(item)
             

pyqtgraph/graphicsItems/FillBetweenItem.py

@@ -28,7 +28,7 @@ class FillBetweenItem(QtGui.QGraphicsPathItem):
             for c in self.curves:
                 try:
                     c.sigPlotChanged.disconnect(self.curveChanged)
-                except TypeError:
+                except (TypeError, RuntimeError):
                     pass
         
         curves = [curve1, curve2]

pyqtgraph/graphicsItems/GraphicsItem.py

@@ -479,24 +479,29 @@ class GraphicsItem(object):
 
         ## disconnect from previous view
         if oldView is not None:
-            #print "disconnect:", self, oldView
+            for signal, slot in [('sigRangeChanged', self.viewRangeChanged),
-            try:
+                                 ('sigDeviceRangeChanged', self.viewRangeChanged), 
-                oldView.sigRangeChanged.disconnect(self.viewRangeChanged)
+                                 ('sigTransformChanged', self.viewTransformChanged), 
-            except TypeError:
+                                 ('sigDeviceTransformChanged', self.viewTransformChanged)]:
-                pass
+                try:
-            
+                    getattr(oldView, signal).disconnect(slot)
-            try:
+                except (TypeError, AttributeError, RuntimeError):
-                oldView.sigTransformChanged.disconnect(self.viewTransformChanged)
+                    # TypeError and RuntimeError are from pyqt and pyside, respectively
-            except TypeError:
+                    pass
-                pass
             
             self._connectedView = None
 
         ## connect to new view
         if view is not None:
             #print "connect:", self, view
-            view.sigRangeChanged.connect(self.viewRangeChanged)
+            if hasattr(view, 'sigDeviceRangeChanged'):
-            view.sigTransformChanged.connect(self.viewTransformChanged)
+                # connect signals from GraphicsView
+                view.sigDeviceRangeChanged.connect(self.viewRangeChanged)
+                view.sigDeviceTransformChanged.connect(self.viewTransformChanged)
+            else:
+                # connect signals from ViewBox
+                view.sigRangeChanged.connect(self.viewRangeChanged)
+                view.sigTransformChanged.connect(self.viewTransformChanged)
             self._connectedView = weakref.ref(view)
             self.viewRangeChanged()
             self.viewTransformChanged()

pyqtgraph/graphicsItems/ViewBox/ViewBox.py

@@ -881,7 +881,7 @@ class ViewBox(GraphicsWidget):
             try:
                 getattr(oldLink, signal).disconnect(slot)
                 oldLink.sigResized.disconnect(slot)
-            except TypeError:
+            except (TypeError, RuntimeError):
                 ## This can occur if the view has been deleted already
                 pass
             

pyqtgraph/graphicsWindows.py

@@ -19,11 +19,14 @@ def mkQApp():
 
 
 class GraphicsWindow(GraphicsLayoutWidget):
+    """
+    Convenience subclass of :class:`GraphicsLayoutWidget 
+    <pyqtgraph.GraphicsLayoutWidget>`. This class is intended for use from 
+    the interactive python prompt.
+    """
     def __init__(self, title=None, size=(800,600), **kargs):
         mkQApp()
-        #self.win = QtGui.QMainWindow()
         GraphicsLayoutWidget.__init__(self, **kargs)
-        #self.win.setCentralWidget(self)
         self.resize(*size)
         if title is not None:
             self.setWindowTitle(title)

pyqtgraph/parametertree/Parameter.py

@@ -516,7 +516,7 @@ class Parameter(QtCore.QObject):
         self.sigChildRemoved.emit(self, child)
         try:
             child.sigTreeStateChanged.disconnect(self.treeStateChanged)
-        except TypeError:  ## already disconnected
+        except (TypeError, RuntimeError):  ## already disconnected
             pass
 
     def clearChildren(self):

pyqtgraph/widgets/GraphicsLayoutWidget.py

@@ -4,9 +4,27 @@ from .GraphicsView import GraphicsView
 
 __all__ = ['GraphicsLayoutWidget']
 class GraphicsLayoutWidget(GraphicsView):
+    """
+    Convenience class consisting of a :class:`GraphicsView 
+    <pyqtgraph.GraphicsView>` with a single :class:`GraphicsLayout
+    <pyqtgraph.GraphicsLayout>` as its central item. 
+
+    This class wraps several methods from its internal GraphicsLayout:
+    :func:`nextRow <pyqtgraph.GraphicsLayout.nextRow>`
+    :func:`nextColumn <pyqtgraph.GraphicsLayout.nextColumn>`
+    :func:`addPlot <pyqtgraph.GraphicsLayout.addPlot>`
+    :func:`addViewBox <pyqtgraph.GraphicsLayout.addViewBox>`
+    :func:`addItem <pyqtgraph.GraphicsLayout.addItem>`
+    :func:`getItem <pyqtgraph.GraphicsLayout.getItem>`
+    :func:`addLabel <pyqtgraph.GraphicsLayout.addLabel>`
+    :func:`addLayout <pyqtgraph.GraphicsLayout.addLayout>`
+    :func:`removeItem <pyqtgraph.GraphicsLayout.removeItem>`
+    :func:`itemIndex <pyqtgraph.GraphicsLayout.itemIndex>`
+    :func:`clear <pyqtgraph.GraphicsLayout.clear>`
+    """
     def __init__(self, parent=None, **kargs):
         GraphicsView.__init__(self, parent)
         self.ci = GraphicsLayout(**kargs)
-        for n in ['nextRow', 'nextCol', 'nextColumn', 'addPlot', 'addViewBox', 'addItem', 'getItem', 'addLabel', 'addLayout', 'addLabel', 'addViewBox', 'removeItem', 'itemIndex', 'clear']:
+        for n in ['nextRow', 'nextCol', 'nextColumn', 'addPlot', 'addViewBox', 'addItem', 'getItem', 'addLayout', 'addLabel', 'removeItem', 'itemIndex', 'clear']:
             setattr(self, n, getattr(self.ci, n))
         self.setCentralItem(self.ci)

pyqtgraph/widgets/GraphicsView.py

@@ -40,8 +40,8 @@ class GraphicsView(QtGui.QGraphicsView):
     The view can be panned using the middle mouse button and scaled using the right mouse button if
     enabled via enableMouse()  (but ordinarily, we use ViewBox for this functionality)."""
     
-    sigRangeChanged = QtCore.Signal(object, object)
+    sigDeviceRangeChanged = QtCore.Signal(object, object)
-    sigTransformChanged = QtCore.Signal(object)
+    sigDeviceTransformChanged = QtCore.Signal(object)
     sigMouseReleased = QtCore.Signal(object)
     sigSceneMouseMoved = QtCore.Signal(object)
     #sigRegionChanged = QtCore.Signal(object)
@@ -219,8 +219,8 @@ class GraphicsView(QtGui.QGraphicsView):
             else:
                 self.fitInView(self.range, QtCore.Qt.IgnoreAspectRatio)
             
-        self.sigRangeChanged.emit(self, self.range)
+        self.sigDeviceRangeChanged.emit(self, self.range)
-        self.sigTransformChanged.emit(self)
+        self.sigDeviceTransformChanged.emit(self)
         
         if propagate:
             for v in self.lockedViewports:
@@ -287,7 +287,7 @@ class GraphicsView(QtGui.QGraphicsView):
         image.setPxMode(True)
         try:
             self.sigScaleChanged.disconnect(image.setScaledMode)
-        except TypeError:
+        except (TypeError, RuntimeError):
             pass
         tl = image.sceneBoundingRect().topLeft()
         w = self.size().width() * pxSize[0]
@@ -368,14 +368,14 @@ class GraphicsView(QtGui.QGraphicsView):
             delta = Point(np.clip(delta[0], -50, 50), np.clip(-delta[1], -50, 50))
             scale = 1.01 ** delta
             self.scale(scale[0], scale[1], center=self.mapToScene(self.mousePressPos))
-            self.sigRangeChanged.emit(self, self.range)
+            self.sigDeviceRangeChanged.emit(self, self.range)
 
         elif ev.buttons() in [QtCore.Qt.MidButton, QtCore.Qt.LeftButton]:  ## Allow panning by left or mid button.
             px = self.pixelSize()
             tr = -delta * px
             
             self.translate(tr[0], tr[1])
-            self.sigRangeChanged.emit(self, self.range)
+            self.sigDeviceRangeChanged.emit(self, self.range)
         
     def pixelSize(self):
         """Return vector with the length and width of one view pixel in scene coordinates"""

pyqtgraph/widgets/PlotWidget.py

@@ -12,7 +12,9 @@ from ..graphicsItems.PlotItem import *
 __all__ = ['PlotWidget']
 class PlotWidget(GraphicsView):
     
-    #sigRangeChanged = QtCore.Signal(object, object)  ## already defined in GraphicsView
+    # signals wrapped from PlotItem / ViewBox
+    sigRangeChanged = QtCore.Signal(object, object)
+    sigTransformChanged = QtCore.Signal(object)
     
     """
     :class:`GraphicsView <pyqtgraph.GraphicsView>` widget with a single