Add support for sticky columns to Table component

Update: This issue has morphed into the MultiGrid component (see PR #499)

[skipjack]

Jumping in late here, and I could definitely be missing something seeing as I’m fairly new to react-virtualized, but doesn’t MultiGrid also not support column definitions through the <Column> component? IMHO the loss of the relatively straightforward <Column> api to a need for a lot of complexity within the cellRenderer method is another significant downside (maybe even more so than sorting).

In examples like this one, the MultiGrid seems great but that cellRenderer method will get much more complex once you get into things like customized header cells, customized normal cells and more. Maybe this could be offset by creating a custom <Column> that cellRenderer uses to support these features? Then at least those attributes could be specified in the data, I guess.

[bvaughn]

This ticket was primarily about sticky/fixed column support. True, that was possible with ScrollSync but the amount of boilerplate required made it an unpalatable option. That is no longer the case as of v8.9.0.

Table really doesn’t do much to enable sortable columns. It doesn’t actually sort data. It doesn’t even maintain which attribute the data is currently sorted by. It just adds click-handlers and a basic sort icon to the header row- something that could also be done with MultiGrid.

The main useful thing Table does over Grid is declare flex layouts for its columns so they grow or shrink to fit within the available width. Because this is the primary purpose of Table- its design doesn’t adapt well to horizontal scrolling and so the concept of fixed/sticky columns within a Table doesn’t make much sense. (After all, without horizontal scrolling all columns are “sticky”.)

I did experiment a bit with enabling horizontal scroll within a Table but was unhappy with the results. All of the above went into my thought processes when deciding that MultiGrid is probably a better solution for this than Table. The missing feature- sortable rows- is pretty easy to add to a MultiGrid- much easier than to add horizontal scrolling support to a Table. 😄