Variable to know if back layer is expanded or collapsed

[kartikg33]

I am creating a mechanism where the back layer displays a list of items, and the front layer shows detailed information about the selected item.

Once an item is selected from the back layer, I want the appbar title to display the name of the selected item, else if the back layer is expanded, I want to set the appbar title to something more generic such as "Items List".

Is there a way to do this natively with backdrop? Or is there a variable that can be checked so that I can at least know the current state of the back layer (either collapsed or expanded)?

[WieFel]

Hi @kartikg33, thanks for submitting the issue.

You should be able to achieve what you want using one of these 2 getters:

• Backdrop.of(context).isBackLayerConcealed (true if the back layer is "not visible")
  

  backdrop/lib/src/scaffold.dart

  Lines 440 to 443 in d21cfaa

  	/// Whether the back layer is concealed or not.
  	bool get isBackLayerConcealed =>
  	animationController.status == AnimationStatus.completed ||
  	animationController.status == AnimationStatus.forward;

• Backdrop.of(context).isBackLayerRevealed (true if the back layer is "visible")
  

  backdrop/lib/src/scaffold.dart

  Lines 445 to 448 in d21cfaa

  	/// Whether the back layer is revealed or not.
  	bool get isBackLayerRevealed =>
  	animationController.status == AnimationStatus.dismissed ||
  	animationController.status == AnimationStatus.reverse;