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BUG : modified logic on starting qApp #3360

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Merged
merged 1 commit into from
Aug 17, 2014
Merged

BUG : modified logic on starting qApp #3360

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BUG : modified logic on starting qApp 
when working in ipython, it seems that _create_qApp is not called
until the first time that a figure is made, but ipython has already
started up the QApplication for us (I think) so that we never set
backend_qt5 to be non-None.  This seems to mostly be ok, but breaks
`plt.pause`.
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@tacaswell
tacaswell committed Aug 10, 2014
commit b23396c85a8ca03229d84245b0c94128ea11c1d5
4 changes: 2 additions & 2 deletions lib/matplotlib/backends/backend_qt5.py
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Original file line number Diff line number Diff line change
Expand Up @@ -125,13 +125,13 @@ def _create_qApp():
"""
Only one qApp can exist at a time, so check before creating one.
"""
if QtWidgets.QApplication.startingUp():

if qApp is None:
if DEBUG:
print("Starting up QApplication")
global qApp
app = QtWidgets.QApplication.instance()
if app is None:

# check for DISPLAY env variable on X11 build of Qt
if hasattr(QtGui, "QX11Info"):
display = os.environ.get('DISPLAY')
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