Flutter keep certain elements fixed during scrolling?

Question

How to keep some elements fixed (and above scrollable parts) during scroll? Does it need to be inside a SingleChildScrollView?

Made a visual example of my problem:

I need the blue part to be scrollable, and that it goes behind the green part that needs to stay fixed.

This is a simplified part of my code:

body: SingleChildScrollView(
          child: ListView(
            children: [
              Obx(()=>Container(THIS CONTAINER SHOULD STAY FIXED DURING SCROLL)),
              Obx(()=>Column(THIS PART SHOULD BE SCROLLABLE)),
              Obx(()=>Text(THIS PART SHOULD BE SCROLLABLE)),
              Obx(()=>Row(THIS PART SHOULD BE SCROLLABLE))
            ],
          )
        ),

Answer 1

If you put your ListView widget and FixedContainer widget in a Column, it will work.

For example:

 Column(
    children: [
       Obx(()=>Container(THIS CONTAINER SHOULD STAY FIXED DURING SCROLL)),
       Expanded(
           child: ListView(
              Obx(()=>Column(THIS PART SHOULD BE SCROLLABLE)),
              Obx(()=>Text(THIS PART SHOULD BE SCROLLABLE)),
              Obx(()=>Row(THIS PART SHOULD BE SCROLLABLE)),
           ),
       ),
    ],
 )