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  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: kBaseThemeData,
      home: Scaffold(
        body: IndexedStack(
          index: _currentIndex,
          children: <Widget>[
            VocabConfigurationListScreen(),
            GrammarHomeWidget()

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final kBaseThemeData = ThemeData(
    primaryColor: Color.fromRGBO(58, 66, 86, 1.0),
    backgroundColor: Color.fromRGBO(58, 66, 86, 1.0)
);

class _MyAppState extends State<MyApp> {
  int _currentIndex = 0;

  @override
  Widget build(BuildContext context) {

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  Widget createLevelMenu() {
    return PopupMenuButton<GrammarLevel>(
      color: kBaseThemeData.primaryColor,
      onSelected: _selectLevel,
      itemBuilder: (BuildContext context) {
        return GrammarLevel.values.map((level) {
          String title = level.toString().split('.').last;
          return PopupMenuItem<GrammarLevel>(
            value: level,
            child: Text(

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class _SentenceWidgetState extends State<SentenceWidget> {
  bool isDisplayDefinition = false;
  Timer timer;

  @override
  Widget build(BuildContext context) {
    return ListTile(
      onTap: toggleDefinitionVisibility,
      contentPadding: EdgeInsets.all(8),

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* {
	color: #000000!important;
	font-weight:900 !important;
	border-color: #555555 !important;
	scrollbar-arrow-color: #CCCCCC !important;
	scrollbar-base-color: #2266AA !important;
	scrollbar-shadow-color: #2266AA !important;
	scrollbar-face-color: #333333 !important;
	scrollbar-highlight-color: #2266AA !important;
	scrollbar-dark-shadow-color: #2266AA !important;

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    webView.setWebViewClient(new WebViewClient() {

        @Override
        public void onPageFinished(WebView view, String url) {
            injectCSS();
            injectJS();
            super.onPageFinished(view, url);
        }
    });

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sequenceDiagram
    Activity->>+NinjiaWebView: 1.loadUrl(normalUrl)
    NinjiaWebView->>WebKitEngine: 2. trigger loading
    WebKitEngine-->>NinjiaWebView: 3. onPageFinished()
    NinjiaWebView->>NinjiaWebView: 4. injectCSS()
    NinjiaWebView->>-NinjiaWebView: 5. loadUrl(javascript)

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// 建立 loadbalancer object，指定想要產生的 isolate 數目
Future<LoadBalancer> loadBalancer = LoadBalancer.create(8, IsolateRunner.spawn);

typedef Uint8List ImageProcessFunction(Uint8List bytes);

// 將 loadBalancer 相關操作包成 function。 這一步並非是必要的，可以直接使用 line 9 和 line 11。
Future<Uint8List> loadBalancerRun(ImageProcessFunction function, Uint8List bytes) async {
  // 在使用 loadBalancer 時，要先 await 一下，取得資源
  final lb = await loadBalancer;
  // 呼叫 lb.run，執行原本 compute 在進行的工作

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// Implement a function to create OverlayEntry
OverlayEntry getMyOverlayEntry({
  @required BuildContext context,
  SomeData someData,
}) {
  return OverlayEntry(
      builder: (context) {
        return AlertDialog(child: SomeWidgetAgain());
      }
  );

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dependencies:
 flutter:
   sdk: flutter
 # Internationalization support.
 flutter_localizations:
   sdk: flutter
 intl: 0.16.1
 # the rest of your dependencies