No keyboard usage for accessibility

[willsmanley]

On web builds, it is impossible to navigate the dropdown options using the arrow keys.

This is present in material's dropdown button, but not this implementation.

It should work the same as an HTML <select> where you can focus into the dropdown with tab + space (which works) and then navigate between the options with arrow and select an option with space (which is not yet implemented).

This probably isn't too hard to do, I will take a look if I can solve it in a fork and put up a PR if its good.

[AhmedLSayed9]

If the selectedValue is null and you open the dropdown:

• In material's DropdownButton, the first item is selected.
• in DropdownButton2, no item will be selected (sound's reasonable to me) and you should press tab to start selecting an item.

Screen.Recording.2025-01-18.at.6.49.44.AM.mov

If there's a selectedValue and you open the dropdown, the item will be selected at both materials's DropdownButton and DropdownButton2:

Screen.Recording.2025-01-18.at.6.50.16.AM.mov

[willsmanley]

I think the PR that I mentioned above is required for this to work (at least on the older API, I can't remember right now but I think there was some kind of recent API change. Maybe this only applies to the version I checked out there?)

[willsmanley]

Ah yeah here's my comment about it: #340 (comment)

[AhmedLSayed9]

The current version 3.0.0-beta.21 is safe to be used. Actually, it has some other important fixes.

Your PR fixes the issue on the stable release but introduces another issue (as commented above the line you've remove).

If you need to fix this on the stable release, you should apply the following commits:
9a5116d
d073640

[AhmedLSayed9]

The beta version is just not released because I'm trying to implement the pagination feature before publishing version 3, which may require new apis and other breaking changes. But meh, I haven't found the time yet. I might just release it soon and postpone the pagination feature.