I've been trying the Qt4Agg backend for matplotlib and I've encountered two
problems. The following code illustrates the issues:
import matplotlib
matplotlib.use('Qt4Agg')
import matplotlib.pyplot as plt
plt.ion()
plt.plot([1,2,3])
canvas=plt.gcf().canvas
def on_key(event):
print 'you pressed', event.key, event.xdata, event.ydata
canvas.mpl_connect('key_press_event', on_key)
The problems:
1) The user has to click within the canvas before key press events are
registered. Activating the window is not sufficient.
2) Keys 'up', 'down', 'left', 'right', 'pageup', and 'pagedown' all return
event.key=None.
The tkagg and gtkagg backends don't have these problems - key press events
are active as soon as the window is active, and event.key reports the
correct key. Does anyone have an idea why these problems are cropping up
with Qt4 or know a workaround?
Thanks,
-Andrew Mark
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