[bug] header Height not updated once built

[hassanbasanjide]

if i change the height of Header by BLOC and set it dynamic the header Height nothing
changed.

[WieFel]

Could you provide a simple code snippet with what you are trying to achieve?

Why do you need to change the height dynamically via BLOC?
Maybe you should have a look at the stickyFrontLayer property, which allows to automatically adapt the height to the back layer content.

[daadu]

@hassanbasanjide It could be because of flutter not redrawing the BackdropScaffold. Does setting UniqueKey to BackdropScaffold solve the issue?

As @WieFel suggested, share some code that could reproduce the bug.

[hassanbasanjide]

@WieFel stickyfrontlayer is true. and backlayers have a different height but nothing Changed. ;(
the space of back layer witch have no content is blue.
actually the header height just accept one height at begin.
@OverRide
Widget build(BuildContext context) {
@OverRide
void changeController() {

  setState(() {
    expanded ? _controller.forward() : _controller.reverse();
    expanded = !expanded;

  });
}

return BlocBuilder<StoreBackDropControllerBloc,
    StoreBackDropControllerState>(
  builder: (context, state) {
    return BackdropScaffold(
     stickyFrontLayer: true,
      resizeToAvoidBottomInset: false,
      appBar: state.when(
        initial: (state) => storeNormalAppBar(
          context: context,
          targetFunction: () => changeController(),
        ),
        searchPage: (state) => searchAppBar(
          context: context,
          targetFunction: () => changeController(),
        ),
        filterPage: (state) => filterAppBar(
          context: context,
          targetFunction: () => changeController(),
        ),
      ),
      frontLayer: StorePageSubScreenForm(),
      subHeaderAlwaysActive: false,
  
      frontLayerBorderRadius: BorderRadius.circular(0),
      controller: _controller,
      backLayer: state.when(
          initial: (state) => SearchScreen(),
          searchPage: (state) => SearchScreen(),
          filterPage: (state) => FiltersScreen()),
      
    );
  },
);

}
}

[hassanbasanjide]

[hassanbasanjide]

@daadu i need some things like images. now what is your recommend?

[hassanbasanjide]

The problem is you can't change the key which is created for the backdrop. And because of that when the backdrop changes in any state, the widget isn't being recreated and the height of the widget is not being redrawn. @daadu I can't set a new UniqueKey upon changing state because the BackdropScaffold doesn't accepts Key. And if I change the parent's key when the state changes It the backLayer Isn't being drawn.

[daadu]

@hassanbasanjide I will look into this during weekend.

[WieFel]

@hassanbasanjide I had a look at it but it is still not enough code for me to reproduce the issue completely.
I pushed a version of BackdropScaffold containing the key property to the branch scaffold_key.

You can try to import it into your project like so (in your pubspec.yaml):

dependencies:
  backdrop:
    git:
      url: git@github.com:fluttercommunity/backdrop.git
      ref: scaffold_key

Try setting a key on BackdropScaffold and tell us if that solves your problem. If yes, we can apply the changes to the master channel of backdrop.