md-tabs should emit changes when focus/select changes

[DennisSmolek]

Feature:

In the current tabs component there is the function set focusIndex(value: number) that would be easy to tap into for an EventEmitter.

Simply adding an @Output of say focusChanged would allow other components/services to listen to when the tabs changed.

This would mean you could fire a location.go() or mySpecialLogger() whenever the user navigates..

[jelbourn]

@DennisSmolek we are going to have a separate component just for using tabs to change the route (see #524), but there should also be events for changing tabs.

[davidanaya]

Hi!

What about the other way around? I have an md-tab-group with <a [routerLink]...> in every md-tab which works fine and loads properly in a <router-outlet> in the same component, but I can also navigate to this tabs (router.navigate) when clicking in elements in a list, and that should also update the selected panel

Is there any obvious way to achieve this? I could update the [selectedIndex] every time I navigate but that doesn´t look very good. I thought about emiting an event myself (selectChange) but not sure this is feasible either.

Thanks!

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