feat(uiSrefActive): provide a ng-{class,style} like interface

[fpipita]

This pull request is based on the suggestion by @nateabele on issue #1431. It enables ui-sref-active to be passed an expression that should evaluate to an object hash with the activeClass and state properties. If state is provided, activeClass is applied to its element if the current active state includes state, even if state is abstract. It works even if ui-sref is found neither on the element nor on any of its children. Furthermore, if state is provided, it takes precedence over the state exposed by ui-sref. Hope it helps to close #1431 :)

[nateabele]

Hey, sorry for not responding right away. After a belated internal discussion with @christopherthielen, we agreed an ng-class-style interface would be better, i.e. with class names as keys and state names/globs as the values, i.e. { active: "admin.*" } — I think that would provide a lot more flexibility and a lot less verbosity?

Would you be willing to update the PR to support that? If not, no worries, and sorry for the back-and-forth.

[fpipita]

Hi, no problem at all about that! I definitely agree with you guys about the ng-{class,style} providing a cleaner interface.

I will update the PR in this week-end.

[nateabele]

Awesome, thanks!

[fpipita]

Hi, I've updated the PR to match the new requirements. Please, let me know if anything else needs to be done :)

[christopherthielen]

Can we get another PR to merge to feature-1.0?

[fpipita]

Hi, I've just opened PR #2375 which brings this feature into feature-1.0.

[shali3]

This is a great feature. you should really document it. I see no mention of this.

[maybenull]

Agree with @shali3, docs are missing this.