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1

I think you need to make a reasonable compromise between the amount of control the user has to undo every step they make with the burden of saving every small change as a new step in the history. By saving every change to a single slider as an undo step could clog up your history stack. What if you have to put a cap on the history states in order to save on ...


3

I don't think to many undos will be a problem. If I nudge (pixel move) a selection in Photoshop, I would like to undo (and redo) in the same detailed level. If I have to push CTRL+Z (or Command+Z) 20 times - that's not a problem. So. Push to undo-stack whenever: Mouse up (from the slider). The slider might have been moved a back and forth a lot with ...


1

You could try using 5 steps rather than 100 then a phrase like 'at least' or 'minumum available'. By only changing your graph when one of the main chunks is completely full the user will only be able to deduce that there is somewhere between (in the example) 2 and 3 chunks of space available. Your graph for either 41% of 59% would look like this. They ...



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