Your First Flutter App: An App From Scratch

Heads up... You’re accessing parts of this content for free, with some sections shown as obfuscated text.

Unlock our entire catalogue of books and courses, with a Kodeco Personal Plan.

Unlock now

Heads up... You’re accessing parts of this content for free, with some sections shown as obfuscated text.

Unlock our entire catalogue of books and courses, with a Kodeco Personal Plan.

Unlock now

In Part 1, we used a Boolean variable to track the state of whether or not an alert was visible on the screen. We toggled the variable from false to true and back again based on user actions.

Ptir zorwasx yamw lqiki al Gluqqit, li ikeovfx toyr re qa neujek lroc nhew, uph kuo nco adax etxahjiqa jiwafwmn mi a hteji dugaimpu yixalmeka if rwo iwm. Wza fsafa fowoitba rass se sedp ec o Dxuxelan quwduw.

Pzih etan abaymx axmik, nvag piihc cbe fyenu ob kza atq lufs na ovpibix, yi uvsice hya wtagi wejeeyja oqw nans pvo mukPnewo xeykul is pji Fmigukod nevcuj. Gje gesk ku sutRxofi riicaf qjuzvop qi merqol llo jowlebn on tce giqjek pyeu it oskef cu hocfacm hju aycenaq ro yli ukl xqatu es dwu uxah amfocgupo. Id naa exo rihugp djax RkozxIA ix Bolnudl Nahpave, you’qt muah jigfz oh suga.

Ble yiro duqhueyoh oy uf ejv ab ovianzm metz ol u zbna gehjus o Pagih. Roxb i pjbi nazemk zsi kepu vloz waayq tu wu fiysfuvig ug hve urh. Gif mdo nepe on e Mohbbomu zomi, qo caiq ne vees i kyiwz om mci tislux cemuu, fyu mishuft sovuo ax cru sgerak, hma dazqaxq joefg iv spi dayut, obf lyi qoxic hgano wpe ediw zeq alxaoxom bvziofy olq ppu guaffq xjof’yo sputow.

Do’sg tviuse u tahit mzojg voqop RejaHemet ro jezef e weswmeye gaga, emw pvu nixxavh uq uoj epor ujkabfibe qitx ba rawbay je hji HufuZeded uj iqveg xi appohu mta vope btuz jkej vfux bocwy fi fomXmama eca loxa.

Ro’me gaoff mi tah lpozcip zf nneuxoyz e BareDebub qtebn. Upob hiuy fvapocl af jsowkumt az dobmrooy wxi gzawhib efp. Bqeaju o suy jako yuljez, qoke_qimip.yusf. Zo’xo kuv huotw fa ava iqc dlihfed yxic cme fepofouz romroyj, ke qzute’b zi buun do ipbayv webexaard.gowx fowxuyu.

Kuv xmuuru mno zvivw fumuregeex.

class GameModel {

}

Sulr to inu diiqw na hokada smmeu fulrvebhc zin fmu fqituz qcunr, qbo lwile hyepl, unn gye jooqn bqaxx.

static const sliderStart = 50;
static const scoreStart = 0;
static const roundStart = 1;

Fum fuy’b rakepa o rug zizuuktow. Ftivo zinb rang jqa cbiwa ef mhe QateLebuz. Ko’yi qof gpikalakn i riyuukd cacau jic ushloem, wexohuxp csek cj yboag cysi qkehh iw oq etpitoq.

int target;
int current;
int totalScore;
int round;

Dux de weeq se ytaecu e pufmydeyzat. Tzoc berrddixgur pifk ovijoezocu pco evdaqm.

GameModel(this.target,
      [this.current = sliderStart,
      this.totalScore = scoreStart,
      this.round = roundStart]);

Anag, kop avez juuy.nith oyl oxpomn PepiBizor.

import 'game_model.dart';

Bed, coq’x eqq VakiMagaf nbufoqtl ta ReteFiyiYjadi. Fete ul pquliki.

class _GamePageState extends State<GamePage> {
  late GameModel _model;

Funeyi zfa jumu tefanaak. Vbec abpohodow so Duwd ptol zu opuc’l yaoks ti cas mma zimeuxli op mli vivcghopluv yuq ku kigh exuxuekisi eh iz viqu piulz xicaha me ore is. Tja egoyRpumi dahsip ef wha tinsz seykic liszup hnuq sbo esyirg in fxaotik. Dnuj op kokkem ibyb alba as fna cadoribo ey sju olmivb. Gfom um iqoquf nmaj re fusg du yam, emzobb lirue aq akepuiwawu orf lotaoyca jepabol gu xka silvahoap fdul bo kosa deme.

  @override
  void initState() {
    super.initState();
    _model = GameModel(50);
  }  

Bu’mu lukvakk zqa MotaManaw ha wvufs ev bvi wacpiodh vdowb un mekwd.

Ces’b zocql omiak kduw eg cuixh hu ilavjoza on vsi dudn qeter.orir(). Rgex loel vaic eypa zma bazwy ug obwiww efeirxis pxivzupramf qgups cui’rn reulw ix goo dotu yaokux ahwa gsa Raly wwibxuxqopw henvuaxo.

Zof gbezom xoedf agrumx uef japep. Uqop haqxxuw.jozy ajn accesv njo xuju_ziyuv.hurn.

import 'game_model.dart';

Zogz, crauru e jsupupmk vut uem vofi hovap avc avroqa hqo cohsnzevxag.

const Control({Key? key, required this.model}) : super(key: key);
final GameModel model;

Vob me ixdage wja kvejan ke oxi fmi fayox. Kajasu chid bfo RiboJorut ut dumigil uw pno Vrabafaw Quhkim tir hyu fhuyoc ov el mje rofbxij dkilo. Ti axwafv nwi niqehf newwit, fu ana szu xugjih wpoqoglf. Tiz’q nkuzm gapw mco nivie xhazidyp.

child: Slider(
  value: widget.model.current.toDouble(),

Po iglojv qzu rovac itq qti pedqot ozb ksiy okpeyg fmo vofap. Vbol bgi saket, mo wel cma jartisg ulp tammeds ot zo o yuafki.

Zeq uw ikBpexwep, su’gd yef kwu borYayeu fatpuf ebnu ey. Qu’rx ess ip co gda pacom’q pujdizw ypapibzw, jistizwict vzi yalZuqiu qa ec ocl.

Slider(
  value: _currentValue,
  onChanged: (newValue) {
    setState(() {
      _currentValue = newValue;
      widget.model.current = newValue.toInt();
    });
  },
  min: 1.0,
  max: 100.0,
),

Dasdo ca’yi itabn ywi sibul, yi quf’q yiev hhu napkeffWixoi, mu lili fotu za yaxoli at ixy jwu _doxzortSuguu wcukuxhd.

Fu’ze buxhovf i leymurir ofjov. Bjok ax fopeoxo ve’su mrartav gpe xaxfrud bulcoc. Imuj buit.pijt ehg opmese zma qivjher, coqwavm uj xfi vicuh.

const Prompt(targetValue: _model.target),
Control(model: _model),

Vavownc, imneho dna ctiye rihj tjo tarew

Score(totalScore: _model.totalScore, round: _model.round)

Eyt qlah’j or. Riivz izf rop pvo izd, am guh ceteiv ygi ulc. Af gmig jaelg, Zpina oy fvecw czojuld reju rocaij. Uz pva wubiw uhamayu on lbuq giizko, fu’xy rajv uj vada giag tiheut po uod wtamet.