title: Keep Hero widget on top of PageView pages in Flutter?
body: <p>I want to have a Hero widget displayed on top of pages in a PageView, so that when I scroll through the pages, the Hero doesn't move at all.</p>
  
  <p>This is the builder for my pages:</p>
  
  <pre><code>Widget _buildPage({color: Color, icon: Icon, text: String}) {
      return Container(
        padding: const EdgeInsets.only(top: 5.0),
        color: color,
        child: Column(
          children: [
            Expanded(
              flex: 3,
              child: Icon(icon)
            ),
            Expanded(
              flex: 2,
              child: Text(text),
            ),
            Expanded(
              flex: 1,
              child: Hero(
                tag: 'examplehero',
                child: Column(
                  children: [
                    Text(...),
                    FlatButton(
                      child: Text(...),
                    ),
                  ...
  </code></pre>
  
  <p>This is my PageView: </p>
  
  <pre><code>return PageView(
        children: [
          _buildPage(...),
          _buildPage(...),
          _buildPage(...),
          _buildPage(...),
        ],
      );
  </code></pre>
  
  <p>Currently, when I scroll through the pages, the hero widget acts like a regular widget, and is scrolled away with the page. How can I keep it always displayed?</p>
  
  <p>Thanks in advance</p>