I'm running the Qt4 backend, and I noticed that I'd frequently get error
messages saying I was pressing unrecognized keys. It turns out that the
direction keys aren't recognized in the qt4 backend. (I'm using direction keys
to switch between spaces in OSX, so this error gets triggered quite frequently)
One possible fix is to just add the direction keys to the list of valid keys
(see patch below). Alternatively, the key event code could just ignore
unrecognized keys (i.e. `key == None`). This change could be made in
FigureCanvasQT.keyPressEvent (in backends.backend_qt4.py) or, more generally,
in FigureCanvasBase.key_press_event (in backend_bases.py).
-Tony
%---Diff
Index: lib/matplotlib/backends/backend_qt4.py
===================================================================
--- lib/matplotlib/backends/backend_qt4.py (revision 8315)
+++ lib/matplotlib/backends/backend_qt4.py (working copy)
@@ -129,6 +129,10 @@
keyvald = { QtCore.Qt.Key_Control : 'control',
QtCore.Qt.Key_Shift : 'shift',
QtCore.Qt.Key_Alt : 'alt',
+ QtCore.Qt.Key_Up : 'up',
+ QtCore.Qt.Key_Right : 'right',
+ QtCore.Qt.Key_Down : 'down',
+ QtCore.Qt.Key_Left : 'left',
}
# left 1, middle 2, right 3
buttond = {1:1, 2:3, 4:2}
%---Full traceback
Traceback (most recent call last):
File "/Users/Tony/python/devel/mpl/lib/matplotlib/backends/backend_qt4.py",
line 198, in keyPressEvent
FigureCanvasBase.key_press_event( self, key )
File "/Users/Tony/python/devel/mpl/lib/matplotlib/backend_bases.py", line
1459, in key_press_event
self.callbacks.process(s, event)
File "/Users/Tony/python/devel/mpl/lib/matplotlib/cbook.py", line 169, in
process
func(*args, **kwargs)
File "/Users/Tony/python/devel/mpl/lib/matplotlib/backend_bases.py", line
2079, in key_press
if event.key in fullscreen_keys:
TypeError: 'in <string>' requires string as left operand, not NoneType
------------------------------------------------------------------------------
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