ExpansionTile messes up _currentIndex calculations about backdrop HOT 4 CLOSED

I ended up with a LayoutBuilder, which did the trick. Nice catch. This feels super messy to me, but it works. Thanks for the assist :)

from backdrop.

This error is because of passing wrong context to Backdrop.of.

You need to put the backLayer part in a custom widget or a workaround would be wrap the ListView around LayoutBuilder and pass the context from LayoutBuilder to Backdrop.of

from backdrop.

This looks like a custom logic not suitable for BackdropNavigationBackLayer. BackdropNavigationBackLayer is designed for simple navigation scenario.

Having said that, your code looks almost done, replace BackdropNavigationBackLayer with ListView or ListView.builder and that should do the job. I guess!

PS: You can call Backdrop.of(context).showFrontLayer() after setState() in onTap, to show the front layer

from backdrop.

PS: You can call Backdrop.of(context).showFrontLayer() after setState() in onTap, to show the front layer

Doesn't appear to be working.

ListTile(
  title: Text("Test"),
  onTap: () {
    setState(() => _currentIndex = 0);
    Backdrop.of(context).showFrontLayer();
  },
),

════════ Exception caught by gesture ═══════════════════════════════════════════
The following NoSuchMethodError was thrown while handling a gesture:
The getter 'data' was called on null.
Receiver: null
Tried calling: data

When the exception was thrown, this was the stack
#0      Object.noSuchMethod  (dart:core-patch/object_patch.dart:53:5)
#1      Backdrop.of 
package:backdrop/backdrop.dart:27
#2      _MainPageState.build.<anonymous closure> 
package:t4c_companion/main.dart:129
#3      _InkResponseState._handleTap 
package:flutter/…/material/ink_well.dart:779
#4      _InkResponseState.build.<anonymous closure> 
package:flutter/…/material/ink_well.dart:862

from backdrop.