Ability to handle multiple selected cells

[NikxDa]

Hey there,

I would like to suggest a feature that allows the slider to have multiple selected cells. There have been several issues like this discussed, but most of them focused on how to determine a slider boundary, not so much the issue of multiple selected elements.

Here's the issue broken down:

• A slider with contain: true will still be able to change slides without actually moving (as referenced in Disable prev/next buttons for contain #289)
• A slider with groupCells will not have this issue, but will behave differently when sliding (not sliding one at a time, but per group).

I wonder if it is possible to achieve the following scenario (where X is a slide that is selected, x (lowercase) is a normal slide, and the viewport is determined by []:

x x [ X X X ] x x -> next -> x x x [ X X X ] x

I would envision a property called selectionSize that starts out with the first selectionSize items being selected, and then shifts them one at a time when moving in either direction. This would be really useful for cases where slides need to move one at a time, with multiple slides being in viewport, and the inactive slides having certain styles (like opacity) set.

[desandro]

Thanks for this feature request. Between contain and groupCells I feel these features cover enough accommodate most use cases. Adding a third behavior may help, but would make only make things more complicated. For example, how would selectionSize work with groupCell. I appreciate the idea but I'll have to pass on this one.