child: new FutureBuilder(
                future: _orderTicket(widget.perf, widget.nbTicket),
                builder: (BuildContext context, AsyncSnapshot snapshot) {
                  if (snapshot.hasData) {
                    if (snapshot.data != null) {
                      return new Column(
                          mainAxisAlignment: MainAxisAlignment.center,
                          children: <Widget>[
                            new QrImage(
                              data: snapshot.data,
                              size: 300.0,
                              errorCorrectionLevel: 3,
                            ),
                            new Text(widget.filmTitle,
                                style: new TextStyle(
                                    color: Colors.black,
                                    fontSize: (widget.filmTitle.length > 16
                                        ? (widget.filmTitle.length > 24
                                            ? (widget.filmTitle.length > 40
                                                ? 10.0
                                                : 16.0)
                                            : 20.0)
                                        : 30.0))),
                            new Text(
                                (widget.dtime.day.toString() +
                                    "/" +
                                    widget.dtime.month.toString() +
                                    "/" +
                                    widget.dtime.year.toString() +
                                    "  à  " +
                                    widget.dtime.hour.toString() +
                                    ":" +
                                    (widget.dtime.minute < 10
                                        ? "0" + widget.dtime.minute.toString()
                                        : widget.dtime.minute.toString())),
                                style: new TextStyle(
                                    color: Colors.black, fontSize: 23.0)),
                            new Text(snapshot.data,
                                style: new TextStyle(
                                    color: Colors.black, fontSize: 20.0)),
                            new Text(
                                widget.nbTicket.toString() +
                                    (widget.nbTicket == 1
                                        ? " Ticket"
                                        : " Tickets"),
                                style: new TextStyle(
                                    color: Colors.black, fontSize: 20.0)),
                          ]);
                    } else {
                      return new CircularProgressIndicator();
                    }
                  } else {
                    return new CircularProgressIndicator();
                  }
                }),