title: Flutter: SizedBox with Dynamic Height
body: <p>I am trying to create a custom list (alternative to using <code>ListTile</code> widget).</p>
  
  <p>My code looks like this:</p>
  
  <pre class="lang-dart prettyprint-override"><code>Widget build(BuildContext context) {
    return Padding(
      padding: EdgeInsets.symmetric(vertical: 10.0),
      child: SizedBox(
        height: 70,
        child: Row(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: &lt;Widget&gt;[
            thumbnail,
            Expanded(
              child: Padding(
                padding: EdgeInsets.fromLTRB(10.0, 0.0, 2.0, 0.0),
                child: CommentDescription(
                  author: author,
                  comment: comment,
                  createdAt: createdAt,
                  isLiked: isLiked,
                  likesCount: likesCount,
                )
              )
            ),
            menu
          ],
        )
      )
    );
  }
  </code></pre>
  
  <p>CommentDescription Widget</p>
  
  <pre class="lang-dart prettyprint-override"><code>Widget build(BuildContext context) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: &lt;Widget&gt;[
        Expanded(
          flex: 2,
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: &lt;Widget&gt;[
              Text(
                '$author',
                maxLines: 1,
                style: TextStyle(fontWeight: FontWeight.bold)
              ),
              Padding(padding: EdgeInsets.only(bottom: 4.0)),
              Text('$comment')
            ],
          )
        ),
        Expanded(
          flex: 1,
          child: Row(
            children: &lt;Widget&gt;[
              Padding(
                padding: EdgeInsets.only(top: 8.0),
                child: Text(
                  '$createdAt',
                  style: TextStyle(
                    fontSize: 12.0,
                    color: Colors.grey
                  )
                )
              ),
              IconButton(
                onPressed: () =&gt; print('liking comment'),
                icon: Icon(
                  isLiked ? Icons.favorite : Icons.favorite_border,
                  color: Colors.red,
                  size: 16.0
                )
              ),
              Padding(
                padding: EdgeInsets.only(top: 8.0),
                child: Text(
                  '$likesCount',
                  style: TextStyle(
                    color: Colors.grey,
                    fontSize: 12.0
                  )
                )
              )
            ],
          )
        )
      ],
    );
  }
  </code></pre>
  
  <p>The problem I have is that, the code is using <code>SizedBox</code> widget to wrap each tile, which requires a fixed height. But I want something that can work with dynamic height because the height of the content cannot be predetermined. Please how do I approach this.  </p>
  
  <p>Note: When I remove <code>SizedBox</code> widget, i get this error message in the console:</p>
  
  <pre><code>The following assertion was thrown during performLayout(): RenderFlex children
  have non-zero flex but incoming height constraints are unbounded. When a column
  is in a parent that does not provide a finite height constraint, for example if 
  it is in a vertical scrollable, it will try to shrink-wrap its children along 
  the vertical axis. Setting a flex on a child (e.g. using Expanded) indicates 
  that the child is to expand to fill the remaining space in the vertical 
  direction. These two directives are mutually exclusive. If a parent is to
  shrink-wrap its child, the child cannot simultaneously expand to fit its parent. 
  Consider setting mainAxisSize to MainAxisSize.min and using FlexFit.loose fits 
  for the flexible children (using Flexible rather than Expanded). This will allow 
  the flexible children to size themselves to less than the infinite remaining 
  space they would otherwise be forced to take, and then will cause the RenderFlex 
  to shrink-wrap the children rather than expanding to fit the maximum constraints 
  provided by the parent. 
  </code></pre>