Backdrop scaffoldkey

[kannel-outis]

Included a scaffoldkey incase one needs to access let's say a snackbar or the bottomsheet of the backdrop scaffold to avoid creating multiple scaffolds :)

[WieFel]

Thanks for the contribution.
I am not sure whether we need an additional property backDropScaffoldKey as we already have the Key key inside the constructor of BackdropScaffold. That key is then passed to super(key: key), which means it is used for the BackdropScaffold instance.

Maybe we could use the same key in

    return WillPopScope(
      onWillPop: () => _willPopCallback(context),
      child: Scaffold(
        key: scaffoldKey,
        key: widget.key ?? scaffoldKey,

Or do we need an extra property backDropScaffoldKey for that?
@daadu @kannel-outis what do you think?

[kannel-outis]

OMG I never really checked for the "key"(I needed it so badly that I had to add it) . Yes the key can be used instead of backdropScaffoldKey.

[WieFel]

But does it make a difference if we pass it to Scaffold(key: key, ...) or not?

[kannel-outis]

No it does not and really sorry for making this PR. I should have checked.

[daadu]

@kannel-outis key property is a recent feature update. You must have tried on the older version earlier, that is why missed it!!

[daadu]

@WieFel key property of any widget is for that widget itself, we shouldn't use it for other widget (might upset flutter!!), instead additional key like scaffoldKey could be added for Scaffold widget.

I suggest adding scaffoldKey to BackdropScaffold which could be used with Scaffold widget if provided, else create a GlobalKey. This can help to get underlying ScaffoldState without needing BuildContext (as of now user can do it by, Backdrop.of(context).scaffoldKey).

I saw similar pattern in MaterialApp widget they have provided navigatorKey option - so that BuildContext could be avoided to access NavigatorState.

[daadu]

@WieFel or @kannel-outis I suggest file new PR for this.

[kannel-outis]

@kannel-outis key property is a recent feature update. You must have tried on the older version earlier, that is why missed it!!

Maybe

[kannel-outis]

@WieFel or @kannel-outis I suggest file new PR for this.

Ok