title: how to get parent widget width in flutter?
body: <p>anyone know how can i get parent widget width ? i try to solve this problem on my UI below</p>
  <p><a href="https://i.stack.imgur.com/OQgyS.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/OQgyS.png" alt="enter image description here" /></a></p>
  <p>here my widget tree</p>
  <pre><code>row
    expanded
       flex:8
        row
          column
            container(
              width : ???? // here i want to get width size of expanded flex: 8
              Wrap(
                children: [  
       Text('item A'),
       Text('item B'),
       Text('item C'),
       Text('item D'),
                        ],
       ),)
  </code></pre>