Unable to add custom navigation in other classes in flutter-CodePudding

I am new to flutter. I am creating UIs for both mobile and web view.

I followed a YouTube video and created a custom HeaderNavigation. It is working completely fine separately.

But when I try to add the header to another class I am getting a lot of errors. I searched google and tried to find different methods to add the navigation bar. But unable to find that.

Please help me to add header to another classes.

I am unable to add the code here, so I am sharing the GitHub repository link.

CodePudding user response：

You are nesting Scaffold(...) and placing the AppBar in a Column.

I moved the AppBar to the main Scaffold and placed the Cards in the body of the Scaffold - this seems to fix the issue, but I'm not sure this is the desired result. I've created a pull-request on your GitHub.

Try this, see if it helps.

CodePudding user response：

As Stated in the Error itself, Expanded widget should be used directly under any flexible widget eg : Row, Column etc.

Whereas in you code in TopBarContent.dart at line 26, you are using Expanded widget under Padding widget

child: Padding(
        padding: EdgeInsets.only(left: 0, right: 20, top: 20, bottom: 20),
        child: Expanded(
          child: Row(
.
.
.

You should try removing Expanded there, if you want to assign full width there try to use SizeBox with width equals to double.infinite

Update:

I checked and found the your RCard is problematic here

you should try giving the height to your coloum item like this

children: [SizedBox(height : 200, child: Headernavigation()),CardContent()],

Also,I see you are using Scaffold everywhere, dont do that, it should only be used for single complete screen everything else can be under normal widgets