title: List<Widgets> in rows and lines dynamically in Flutter
body: <p>I have json:</p>
  
  <pre><code>{
      "name": "Test",
      "groupsCount": 5,
      "groups": [
          {
              "name": "William Cooper",
              "number": 1,
              "linesCount": 2,
              "lines": [
                  {
                      "name": "Brittany Ramirez",
                      "number": 1,
                      "placesCount": 15,
                      "places": [
                          {
                              "name": "Elizabeth Welch",
                              "number": 1
                          },
                          {
                              "name": "Bradley Pugh",
                              "number": 2
                          },
                          {
                              "name": "Noah Johnson",
                              "number": 3
                          },
                          {
                              "name": "Laura Cox",
                              "number": 4
                          },
                          {
                              "name": "Tiffany Hatfield",
                              "number": 5
                          },
                          {
                              "name": "Patricia Hayes",
                              "number": 6
                          },
                          {
                              "name": "Kevin Jenkins MD",
                              "number": 7
                          },
                          {
                              "name": "Brent Wilkins",
                              "number": 8
                          },
                          {
                              "name": "Mr. Bruce Hart",
                              "number": 9
                          },
                          {
                              "name": "Courtney Newman",
                              "number": 10
                          },
                          {
                              "name": "Dawn Campbell",
                              "number": 11
                          },
                          {
                              "name": "Ashley Scott",
                              "number": 12
                          },
                          {
                              "name": "Robert Becker",
                              "number": 13
                          },
                          {
                              "name": "Kevin Williams",
                              "number": 14
                          },
                          {
                              "name": "Elizabeth Davidson",
                              "number": 15
                          }
                      ]
                  },
                  {
                      "name": "Carol Watson",
                      "number": 2,
                      "placesCount": 12,
                      "places": [
                          {
                              "name": "Kathleen Jones",
                              "number": 16
                          },
                          {
                              "name": "Robin Smith",
                              "number": 17
                          },
                          {
                              "name": "David Johnson",
                              "number": 18
                          },
                          {
                              "name": "Richard Boyd",
                              "number": 19
                          },
                          {
                              "name": "Mason Randolph",
                              "number": 20
                          },
                          {
                              "name": "James Bernard",
                              "number": 21
                          },
                          {
                              "name": "Timothy Miller",
                              "number": 22
                          },
                          {
                              "name": "Thomas Stone",
                              "number": 23
                          },
                          {
                              "name": "Steven Jones",
                              "number": 24
                          },
                          {
                              "name": "William Hernandez",
                              "number": 25
                          },
                          {
                              "name": "Joy Duarte",
                              "number": 26
                          },
                          {
                              "name": "Justin Anderson",
                              "number": 27
                          }
                      ]
                  }
              ]
          },
          {
              "name": "Sarah Jordan",
              "number": 2,
              "linesCount": 1,
              "lines": [
                  {
                      "name": "Lacey Estrada",
                      "number": 3,
                      "placesCount": 15,
                      "places": [
                          {
                              "name": "Madison Smith",
                              "number": 28
                          },
                          {
                              "name": "Kathleen Wells",
                              "number": 29
                          },
                          {
                              "name": "Dale Gross",
                              "number": 30
                          },
                          {
                              "name": "Brandy Cabrera",
                              "number": 31
                          },
                          {
                              "name": "Ashley Torres",
                              "number": 32
                          },
                          {
                              "name": "Ralph Long",
                              "number": 33
                          },
                          {
                              "name": "Christopher Walker",
                              "number": 34
                          },
                          {
                              "name": "Kimberly Moore",
                              "number": 35
                          },
                          {
                              "name": "Andrea Ortiz",
                              "number": 36
                          },
                          {
                              "name": "Heidi Todd",
                              "number": 37
                          },
                          {
                              "name": "Austin Wang",
                              "number": 38
                          },
                          {
                              "name": "Bryan Adams",
                              "number": 39
                          },
                          {
                              "name": "Jeffrey Alvarado",
                              "number": 40
                          },
                          {
                              "name": "Richard Morrison",
                              "number": 41
                          },
                          {
                              "name": "Jennifer Hodge",
                              "number": 42
                          }
                      ]
                  }
              ]
          },
          {
              "name": "Tiffany Lynch",
              "number": 3,
              "linesCount": 1,
              "lines": [
                  {
                      "name": "Kimberly Howe DVM",
                      "number": 4,
                      "placesCount": 15,
                      "places": [
                          {
                              "name": "Nancy King",
                              "number": 43
                          },
                          {
                              "name": "Angela Cabrera",
                              "number": 44
                          },
                          {
                              "name": "Elizabeth Mack",
                              "number": 45
                          },
                          {
                              "name": "Shelly Riggs",
                              "number": 46
                          },
                          {
                              "name": "Jeremy French",
                              "number": 47
                          },
                          {
                              "name": "Deborah Myers",
                              "number": 48
                          },
                          {
                              "name": "Robert Kramer",
                              "number": 49
                          },
                          {
                              "name": "Brian Cunningham MD",
                              "number": 50
                          },
                          {
                              "name": "Christopher Brown",
                              "number": 51
                          },
                          {
                              "name": "Kathryn James",
                              "number": 52
                          },
                          {
                              "name": "Cassandra Martinez",
                              "number": 53
                          },
                          {
                              "name": "Nathan Long",
                              "number": 54
                          },
                          {
                              "name": "Molly Wilson",
                              "number": 55
                          },
                          {
                              "name": "Matthew Reilly",
                              "number": 56
                          },
                          {
                              "name": "Erin Maddox",
                              "number": 57
                          }
                      ]
                  }
              ]
          },
          {
              "name": "Christopher Martin",
              "number": 4,
              "linesCount": 1,
              "lines": [
                  {
                      "name": "Gina Brewer",
                      "number": 5,
                      "placesCount": 13,
                      "places": [
                          {
                              "name": "Dennis Owens",
                              "number": 58
                          },
                          {
                              "name": "Rebecca Caldwell",
                              "number": 59
                          },
                          {
                              "name": "James Mckinney",
                              "number": 60
                          },
                          {
                              "name": "Donna Lee",
                              "number": 61
                          },
                          {
                              "name": "Michelle Martinez",
                              "number": 62
                          },
                          {
                              "name": "Jennifer Davis",
                              "number": 63
                          },
                          {
                              "name": "Shawn Moore",
                              "number": 64
                          },
                          {
                              "name": "Jeremiah Reilly",
                              "number": 65
                          },
                          {
                              "name": "Bruce Mendoza",
                              "number": 66
                          },
                          {
                              "name": "Juan Weaver",
                              "number": 67
                          },
                          {
                              "name": "Brian Bates",
                              "number": 68
                          },
                          {
                              "name": "Caitlin Jenkins",
                              "number": 69
                          },
                          {
                              "name": "Rachel Thomas",
                              "number": 70
                          }
                      ]
                  }
              ]
          },
          {
              "name": "Michelle Thompson",
              "number": 5,
              "linesCount": 2,
              "lines": [
                  {
                      "name": "Kathleen Hall",
                      "number": 6,
                      "placesCount": 12,
                      "places": [
                          {
                              "name": "Jennifer Vaughan",
                              "number": 71
                          },
                          {
                              "name": "Glenn Mayer",
                              "number": 72
                          },
                          {
                              "name": "Allison Coleman",
                              "number": 73
                          },
                          {
                              "name": "Brittany Harris",
                              "number": 74
                          },
                          {
                              "name": "John Mccullough",
                              "number": 75
                          },
                          {
                              "name": "James Curtis",
                              "number": 76
                          },
                          {
                              "name": "John Smith",
                              "number": 77
                          },
                          {
                              "name": "Alison Morales",
                              "number": 78
                          },
                          {
                              "name": "Matthew Jones",
                              "number": 79
                          },
                          {
                              "name": "Jessica Watson",
                              "number": 80
                          },
                          {
                              "name": "Yvonne Anderson",
                              "number": 81
                          },
                          {
                              "name": "David Price",
                              "number": 82
                          }
                      ]
                  },
                  {
                      "name": "Sarah White",
                      "number": 7,
                      "placesCount": 10,
                      "places": [
                          {
                              "name": "Kathleen Owen",
                              "number": 83
                          },
                          {
                              "name": "Amy Strickland",
                              "number": 84
                          },
                          {
                              "name": "James Collier",
                              "number": 85
                          },
                          {
                              "name": "Keith Smith Jr.",
                              "number": 86
                          },
                          {
                              "name": "Christopher York",
                              "number": 87
                          },
                          {
                              "name": "Patricia Todd",
                              "number": 88
                          },
                          {
                              "name": "Matthew Harris",
                              "number": 89
                          },
                          {
                              "name": "Betty Mckee",
                              "number": 90
                          },
                          {
                              "name": "Kayla Hahn",
                              "number": 91
                          },
                          {
                              "name": "Craig Duncan",
                              "number": 92
                          }
                      ]
                  }
              ]
          }
      ]
  }
  </code></pre>
  
  <p>and I want to build view using lines and places. So if group have 2 lines and each line has 15 places I want to build something like that:</p>
  
  <pre><code>...............
  ...............
  </code></pre>
  
  <p>This is my code:</p>
  
  <pre><code>    import 'package:flutter/material.dart';
  import 'package:parking/models/groups.dart';
  import 'package:parking/models/parking_group.dart';
  import 'package:parking/services/parking_service.dart';
  
  class ParkingDetailsScreen extends StatefulWidget {
  
    @override
    createState() =&gt; ParkingDetailsState();
  }
  
  class ParkingDetailsState extends State&lt;ParkingDetailsScreen&gt; {
    @override
    Widget build(BuildContext context) {
      return Scaffold(
          appBar: AppBar(
            title: Text("Parking Details"),
          ),
          body: FutureBuilder&lt;ParkingGroup&gt;(
            future: ParkingService.getParking(),
            builder: (context, snapshot) {
              if (snapshot.hasError) print(snapshot.error);
  
              return snapshot.hasData
                  ? _buildParking(snapshot.data)
                  : Center(child: CircularProgressIndicator());
            },
          )
      );
    }
  
  }
  
  final _parkings = &lt;Groups&gt;[];
  
  Widget _buildParking(ParkingGroup parkingGroup) {
    _parkings.clear();
    _parkings.addAll(parkingGroup.groups);
  
    return ListView.builder(
      itemCount: _parkings.length,
      itemBuilder: (context, index) {
        return _buildRow(_parkings[index], context);
      },
    );
  }
  
  Widget _buildRow(Groups parkingGroup, BuildContext context) {
    return Container(
      padding: const EdgeInsets.all(16.0),
      child: Row(
        children: _buildRowList(parkingGroup),
      ),
    );
  }
  
  List&lt;Widget&gt; _buildRowList(Groups parkingGroup) {
    List&lt;Widget&gt; places = [];
    for (var place in parkingGroup.lines) {
      for (var placeLine in place.places) {
        places.add(_buildPlace(placeLine));
      }
    }
    return places;
  }
  
  Widget _buildPlace(place) {
    return Container(
      padding: const EdgeInsets.only(bottom: 8.0),
      child:
      SizedBox(
        height: 5,
        width: 5,
        child: DecoratedBox(
            decoration: BoxDecoration(
              border: Border.all(color: Colors.blueAccent),
            )),
      ),
    );
  }
  //
  //Widget _buildRow(Groups parkingGroup, BuildContext context) {
  //  return Container(
  //      padding: const EdgeInsets.all(16.0),
  //      child: Row(
  //        children: [
  //          Container(
  //            padding: const EdgeInsets.only(bottom: 8.0),
  //            child:
  //            SizedBox(
  //              height: 30,
  //              width: 30,
  //              child: DecoratedBox(
  //                  decoration: BoxDecoration(
  //                border: Border.all(color: Colors.blueAccent),
  //              )),
  //            ),
  //          ),
  //        ],
  //      ),
  //    );
  //}
  </code></pre>
  
  <p>but for this code I see all places in one line:</p>
  
  <pre><code>..............................
  </code></pre>
  
  <p>instead of </p>
  
  <pre><code>   ...............
     ...............
  </code></pre>
  
  <p>What I need to change in my code to get good result?</p>