Reactive rendering #1018
Description
Follow up from #1017 . Right now a subplot is rendered even if nothing has changed in it, this is expensive when we have lots of subplots and especially when we have lots of docks with the HistogramLUTTool next to images. I think we can implement reactive rendering like this:
Graphichas a methodGraphic.flag_update()which is called whenever anything about a graphic changes. This just setsPlotArea.flag_update = True.PlotArea.render()does nothing ifPlotArea.flag_updateisFalse.- The camera also sets
PlotArea.flag_updatewhen its state changes, not entirely sure how to do that yet.
If we do use the plot area flag, if something about a graphic changes we should do the check only if it's False.
@clewis7 thoughts?
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