ASCEE/pyqtgraph
5
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

GraphicsItem.getViewWidget() returns None if widget has been deleted by Qt

Browse Source 
Merge remote-tracking branch 'fabioz/fix_widget_dead' into develop
This commit is contained in:
Luke Campagnola 2014-03-24 15:58:07 -04:00
commit d83869c944
1 changed files with 12 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
pyqtgraph/graphicsItems/GraphicsItem.py
View File

@ -1,4 +1,4 @@
from ..Qt import QtGui, QtCore
from ..Qt import QtGui, QtCore, isQObjectAlive
from ..GraphicsScene import GraphicsScene
from ..Point import Point
from .. import functions as fn
@ -42,8 +42,11 @@ class GraphicsItem(object):
def getViewWidget(self):
"""
Return the view widget for this item. If the scene has multiple views, only the first view is returned.
The return value is cached; clear the cached value with forgetViewWidget()
Return the view widget for this item.
If the scene has multiple views, only the first view is returned.
The return value is cached; clear the cached value with forgetViewWidget().
If the view has been deleted by Qt, return None.
"""
if self._viewWidget is None:
scene = self.scene()
@ -53,7 +56,12 @@ class GraphicsItem(object):
if len(views) < 1:
return None
self._viewWidget = weakref.ref(self.scene().views()[0])
return self._viewWidget()
v = self._viewWidget()
if v is not None and not isQObjectAlive(v):
return None
return v
def forgetViewWidget(self):
self._viewWidget = None