title: How to expand a textField in flutter looks like a text Area
body: <p>When i tap in textField in landScape mode i would like to expand in full screen likes whatsapp</p>
  
  <p><a href="https://i.stack.imgur.com/G8LD1.gif" rel="noreferrer">Example gif Whats</a></p>
  
  <pre><code>            TextFormField(
                keyboardType: TextInputType.number,
                decoration: InputDecoration(
                    prefixIcon: Padding(
                      padding: EdgeInsets.all(0.0),
                      child: Icon(Icons.person,
                          size: 40.0, color: Colors.white),
                    ),
                    hintText: "Input your opinion",
                    hintStyle: TextStyle(color: Colors.white30),
                    border: OutlineInputBorder(
                        borderRadius:
                        BorderRadius.all(new Radius.circular(25.0))),
                    labelStyle: TextStyle(color: Colors.white)),
                textAlign: TextAlign.center,
                style: TextStyle(
                  color: Colors.white,
                  fontSize: 25.0,
                ),
                controller: host,
                validator: (value) {
                  if (value.isEmpty) {
                    return "Empty value";
                  }
                },
              )
  </code></pre>