idle_event is invoked only once #959
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It looks like so little of the idle_event machinery is implemented that it might be best to rip out what is there, none of which seems to be functional in any way. |
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It's good to know this is broken -- I have big plans for it. There was discussion at Scipy of having a "draft mode" that would switch on during panning and zooming (to make it faster) and then have it do a high-quality rendering on idle once the panning stops. So there's a good use case for it -- but clearly it's broken. I'm happy to look into why as part of the above work when I get to it. |
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@mdboom What is the state of this? |
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The docs say idle_event is deprecated (http://matplotlib.org/examples/event_handling/idle_and_timeout.html), so is the issue this is referring to still exist? |
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Closing as we have fully deprecated idle_event as of #8454. |
FigureCanvasBase.idle_event doesn't return anything, meaning it is only called once under the gtk backend. This leads to the apparent breakage of which means examples/idle_and_timeout.py is broken.
All in all it seems that the idle_event callback is incompletely implemented at best. It's quite unclear whether it's even a good idea to pipe this event through CallbackRegistry, since we only really want the backend to register it (with, e.g., gobject.idle_add) if there is a callback to be called. Otherwise we are just creating unnecessary work by executing a stub function.
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