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There are too many issues with overlaying two different dragable items on the same control. For one - if you want both values to be the same then it's going to be hard to see that there are two indicators, or if you then want to adjust one of them it's difficult to make sure you're grabbing the correct item. If there are only two drag points, then why not ...


2

I solved a similar requirement by providing multiple sliders and linking them together, so that they "validate" against each other (UI to configure shifts - which ultimately comes down to start times). Right pictures indicate boundary conditions (min and max, so to speak): Shift 1: --|--------------------- 02:00 |----------- ---------|-- Shift 2: ...


1

I like JonW's solution better, but another possibility is that once the two thumbs are sufficiently close, you could halve the clickable regions of each thumb so that the left thumb's clickable region is its left half and the right thumb's clickable region is its right half. (Or you could continuously adjust the clickable regions as the distance between them ...



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