refactor - making BackdropScaffoldState class public

[daadu]

Closes #31

[daadu]

@WieFel I have made the class public. Request you to complete the documentation as discussed in #31

[WieFel]

Documented the members mentioned in #31.

scaffoldKey is still public. But I think it could be made private?

Also there is getPanelAnimation() which is public. Not sure whether this also should be made private?
@daadu

[daadu]

scaffoldKey is still public. But I think it could be made private?

scaffoldKey is public if some user want to access the underlying scaffold to - show snackbar or somethings like that. It can be done by using Backdrop.of(context).scaffoldKey.currentState.showSnackBar(...)

Also there is getPanelAnimation() which is public. Not sure whether this also should be made private?

I agree, this should be made private

@WieFel Do necessary changes.

[WieFel]

@daadu done!

[daadu]

This feature has landed in v0.4.1 on pub.dev.