On Fri, Jul 18, 2008 at 2:32 PM, David M. Kaplan <[EMAIL PROTECTED]> wrote:
> Well, yeah. I think this would mean a lot of the same code in many > backends. I also like the idea of a deeper hierarchy with a > FigureCanvasUserInterface class that inherits FigureCanvasBase but adds > functional start/stop_loop_events because it would allow for a simple > cbook test for a working user interface: > isinstance(mycanvas,FigureCanvasUserInterface) I'm not sure I see where the redundant code is coming in. In envision the base class doing nothing in start_event_loop and stop_event_loop which solves the problem for the non-UI backends, and all the UI backends will have to be specialized to deal with their own event loops. Basically, we would need to provide implementations for gtk, tk, wx and qt (and maybe qt4?) since these are the four backends that are actually maintained. Perhaps I am overly squeamish, but I am uncomfortable with a default UI implementation here anyhow. This is the paradigm we have used for the canvas draw_idle method and it has worked fine. If we get consensus on this, I think we can bang out the four methods quickly. tk requires nothing special and can be based on the current sleep implementation. I can help with gtk if need be. Paul has already done wx. qt anyone? Also, are the names stop_event_loop and stop_event_loop good choices? I find them confusing because I associate them with the UI event loop which will always be running. Something like wait_start and wait_stop is more intuitive to me. > A deeper hierarchy won't help the inheritance problem for GTKAgg though. I believe this will solve the problem, because FigureCanvasGTK is inherited first, so GTKAgg will get the specialized method. According to Guido at http://www.network-theory.co.uk/docs/pytut/MultipleInheritance.html The only rule necessary to explain the semantics is the resolution rule used for class attribute references. This is depth-first, left-to-right. Thus, if an attribute is not found in DerivedClassName, it is searched in Base1, then (recursively) in the base classes of Base1, and only if it is not found there, it is searched in Base2, and so on. ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Matplotlib-devel mailing list Matplotlib-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
