Bartosz Telenczuk, on 2011-02-13 23:16, wrote: > Hi, > > I am writting an application in which I update dynamically the state > of the figures. When I am done I call the Figure.canvas.draw function > to redraw the figure. However, when the window was previously closed > by the user the update can be skipped. > > Is there a way to tell from a figure handle if the figure is shown on > screen or not? > > Currently, I solve this problem with a callback which sets the figure > handle to None on figure close event. However, I guess there might be > a more direct way of doing that. What would you suggest? > > Thanks a lot for your help.
Hi Bartosz, I don't think there's currently a backend independent way of doing it outside of the approach you have taken. Having a quick look using f = plt.gcf() before and after closing the figure, with a WX backend, the f.canvas object changes to an instance of <class 'wx._core._wxPyDeadObject'>, and loses all of its usual methods. For GTK - looks like f.canvas.window gets set to None. So if you're only targeting one backend, there might be some simple way like this to find out if a figure is being shown using from the figure handle. best, -- Paul Ivanov 314 address only used for lists, off-list direct email at: http://pirsquared.org | GPG/PGP key id: 0x0F3E28F7
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