//文本
 const Text(
    String this.data, {//data必填項(xiàng)文本信息
    Key? key,
    this.style,//文本樣式
    this.strutStyle,//文本字體樣式
    this.textAlign,//文本應(yīng)如何水平對(duì)齊
    this.textDirection,//相對(duì)TextAlign中的start、end而言有用（當(dāng)start使用了ltr相當(dāng)于end使用了rtl，也相當(dāng)于TextAlign使用了left）
    this.locale,
    this.softWrap,//某一行中文本過長，是否需要換行。默認(rèn)為true，
    this.overflow,//如何處理視覺溢出//TextOverflow.fade:將溢出的文本淡化為透明。TextOverflow.clip:剪切溢出的文本以修復(fù)其容器。TextOverflow.ellipsis:使用省略號(hào)表示文本已溢出。
    this.textScaleFactor,//每個(gè)邏輯像素的字體像素?cái)?shù)
    this.maxLines,//本要跨越的可選最大行數(shù)
    this.semanticsLabel,
    this.textWidthBasis,
    this.textHeightBehavior,
  }) : assert(
         data != null,
         'A non-null String must be provided to a Text widget.',
       ),
       textSpan = null,
       super(key: key);
//富文本
 const Text.rich(
    InlineSpan this.textSpan, {
    Key? key,
    this.style,
    this.strutStyle,
    this.textAlign,
    this.textDirection,
    this.locale,
    this.softWrap,
    this.overflow,//如何處理視覺溢出//TextOverflow.fade:將溢出的文本淡化為透明。TextOverflow.clip:剪切溢出的文本以修復(fù)其容器。TextOverflow.ellipsis:使用省略號(hào)表示文本已溢出。
    this.textScaleFactor,//textScaleFactor字體顯示倍率
    this.maxLines,//maxLines文字顯示最大行數(shù)
    this.semanticsLabel,
    this.textWidthBasis,
    this.textHeightBehavior,
  }) : assert(
         textSpan != null,
         'A non-null TextSpan must be provided to a Text.rich widget.',
       ),
       data = null,
       super(key: key);

const TextStyle({
    this.inherit = true,//是否將null值替換為祖先文本樣式中的值（例如，在TextSpan樹中）。如果為false，則沒有顯式值的屬性將恢復(fù)為默認(rèn)值：白色，字體大小為10像素，采用無襯線字體。
    this.color,//文本顏色。如果指定了foreground，則此值必須為null。如自定義顏色：Color.fromRGBO(155, 155, 155, 1) 也可以使用Colors類里面自帶的屬性
    this.backgroundColor,//文本的背景顏色
    this.fontSize,//字體大小，默認(rèn)14像素
    this.fontWeight,//字體厚度，可以使文本變粗或變細(xì)
//FontWeight.bold 常用的字體重量比正常重。即w700
//FontWeight.normal 默認(rèn)字體粗細(xì)。即w400
//FontWeight.w100 薄，最薄
//FontWeight.w200 特輕
//FontWeight.w300 輕
//FontWeight.w400 正常/普通/平原
//FontWeight.w500 較粗
//FontWeight.w600 半粗體
//FontWeight.w700 加粗
//FontWeight.w800 特粗
//FontWeight.w900 最粗
    this.fontStyle,//字體風(fēng)格：
//FontStyle.italic 使用斜體
//FontStyle.normal 使用直立
    this.letterSpacing,//水平字母之間的空間間隔（邏輯像素為單位）?？梢允褂秘?fù)值來讓字母更接近。
    this.wordSpacing,//單詞之間添加的空間間隔（邏輯像素為單位）?？梢允褂秘?fù)值來使單詞更接近。
    this.textBaseline,//對(duì)齊文本的水平線:
//TextBaseline.alphabetic：文本基線是標(biāo)準(zhǔn)的字母基線
//TextBaseline.ideographic：文字基線是表意字基線；
//如果字符本身超出了alphabetic 基線，那么ideograhpic基線位置在字符本身的底部。
    this.height,//文本行與行的高度，作為字體大小的倍數(shù)（取值1~2，如1.2）
    this.leadingDistribution,
    this.locale,
    this.foreground,
    this.background,
    this.shadows,//文本的陰影可以利用列表疊加處理，例如shadows: [Shadow(color:Colors.black,offset: Offset(6, 3), blurRadius: 10)], color即陰影的顏色， offset即陰影相對(duì)文本的偏移坐標(biāo)，blurRadius即陰影的模糊程度，越小越清晰
    this.fontFeatures,
    this.decoration,//文字的線性裝飾，比如 TextDecoration.underline 下劃線， //TextDecoration.lineThrough刪除線
    this.decorationColor,//文本裝飾線的顏色
    this.decorationStyle,//文本裝飾線的風(fēng)格
    this.decorationThickness,
    this.debugLabel,
    String? fontFamily,
    List<String>? fontFamilyFallback,
    String? package,
    this.overflow,
  }) : fontFamily = package == null ? fontFamily : 'packages/$package/$fontFamily',
       _fontFamilyFallback = fontFamilyFallback,
       _package = package,
       assert(inherit != null),
       assert(color == null || foreground == null, _kColorForegroundWarning),
       assert(backgroundColor == null || background == null, _kColorBackgroundWarning);

return Scaffold(
      body: Center(
      child: Text("人生，是一條漫長的路。無論是陽關(guān)大道，還是羊腸小道；無論是春花爛漫的日子，還是冬雪紛飛的季節(jié)；我們都要一路心存美好和希望，不卑不亢，不急不躁，長長的路，慢慢地走得之我幸，失之我命，有些時(shí)候，有些東西，不屬于咱，就未必永遠(yuǎn)不屬于咱，不要去爭，不用去搶，讓冥冥之中的浩瀚軌跡來預(yù)訂。淡泊明志，才能寧靜致遠(yuǎn)。",
        style: TextStyle(
          fontSize: 16,
          fontWeight: FontWeight.w500,//字體厚度
          fontStyle: FontStyle.italic,//斜體
          color: Color.fromRGBO(155, 155, 155, 1),//字體顏色
          height: 2,//文本行與行的高度，作為字體大小的倍數(shù)（取值1~2，如1.2）
          decoration: TextDecoration.underline,//下劃線
          decorationColor: Colors.orange,
          decorationStyle: TextDecorationStyle.dashed//虛線
        ),
 textAlign: TextAlign.center,//對(duì)齊方式，居中對(duì)齊
      ),
      ),
    );

const TextSpan({
    this.text,//顯示文本的組件
    this.children,////子組件
    TextStyle? style,//文本的樣式
    this.recognizer,//指定手勢交互
recognizer: TapGestureRecognizer()..onTap = () {},可以監(jiān)聽點(diǎn)擊事件
    MouseCursor? mouseCursor,
    this.onEnter,
    this.onExit,
    this.semanticsLabel,
    this.locale,
    this.spellOut,
  }) : mouseCursor = mouseCursor ??
         (recognizer == null ? MouseCursor.defer : SystemMouseCursors.click),
       assert(!(text == null && semanticsLabel != null)),
       super(style: style);

return Scaffold(
      body: Center(
        child: RichText(
          textScaleFactor: 5,//字體顯示倍率
          overflow: TextOverflow.fade,//TextOverflow.fade:將溢出的文本淡化為透明。TextOverflow.clip:剪切溢出的文本以修復(fù)其容器。TextOverflow.ellipsis:使用省略號(hào)表示文本已溢出。
          textDirection: TextDirection.ltr,
          textAlign: TextAlign.left,//對(duì)齊方式
          text: TextSpan(
            children: [
              TextSpan(
                  text: "保證不對(duì)外公開或向第三方提供單個(gè)用戶的注冊(cè)資料及用戶在使用網(wǎng)絡(luò)服務(wù)時(shí)存儲(chǔ)",
                  style: TextStyle(
                    color: Colors.black,
                  ),
                  recognizer: TapGestureRecognizer()..onTap = () {}),
              TextSpan(text: "安全協(xié)議",
                  style: TextStyle(
                    color: Colors.red,
                  ),
                  //點(diǎn)擊事件
                  recognizer: TapGestureRecognizer()..onTap = () {
                    print("點(diǎn)擊了安全協(xié)議");
                  })
            ]
          ),
        ),
      ),
    )
-----------------------------------------------------
//另一種方式實(shí)現(xiàn)父文本文本組裝使用Text.rich()
//InlineSpan 是默認(rèn)必須得加的
  InlineSpan span = TextSpan(children: [
      TextSpan(
          text: "保證不對(duì)外公開或向第三方提供單個(gè)用戶的注冊(cè)資料及用戶在使用網(wǎng)絡(luò)服務(wù)時(shí)存儲(chǔ)",
          style: TextStyle(
            color: Colors.black,
          ),
          recognizer: TapGestureRecognizer()..onTap = () {}),
      TextSpan(
          text: "安全協(xié)議",
          style: TextStyle(
            color: Colors.red,
          ),
          //點(diǎn)擊事件
          recognizer: TapGestureRecognizer()
            ..onTap = () {
              print("點(diǎn)擊了安全協(xié)議");
            })
    ]);
    return Scaffold(
      body: Center(
        child: Text.rich(
          span,
          textScaleFactor: 5,
          //字體顯示倍率
          overflow: TextOverflow.fade,
          //TextOverflow.fade:將溢出的文本淡化為透明。TextOverflow.clip:剪切溢出的文本以修復(fù)其容器。TextOverflow.ellipsis:使用省略號(hào)表示文本已溢出。
          textDirection: TextDirection.ltr,
          textAlign: TextAlign.left, //對(duì)齊方式
        ),
      ),
    );

const TextField({
    Key? key,
    this.controller,//控制器，通過它可以獲取文本內(nèi)容，監(jiān)聽編輯文本事件，大多數(shù)情況下我們需要主動(dòng)提供一個(gè)控制器
    this.focusNode,//焦點(diǎn)控制
    this.decoration = const InputDecoration(),//用于控制文本的外觀，如提示文本、背景色、邊框等
    TextInputType? keyboardType,//用于設(shè)置輸入框的默認(rèn)鍵盤類型
    this.textInputAction,//鍵盤動(dòng)作圖標(biāo)按鈕，他是一個(gè)枚舉值
    this.textCapitalization = TextCapitalization.none,//大小寫
    this.style,//樣式
    this.strutStyle,
    this.textAlign = TextAlign.start,//文本框的在水平方向的對(duì)齊方式
    this.textAlignVertical,
    this.textDirection,
    this.readOnly = false,//只讀屬性默認(rèn)false
    ToolbarOptions? toolbarOptions,//長按彈出按鈕設(shè)置
    this.showCursor,//是否顯示光標(biāo)默認(rèn)true
    this.autofocus = false,//是否自動(dòng)獲取焦點(diǎn)
    this.obscuringCharacter = '?',
    this.obscureText = false,//是否隱藏正在編輯的文本，用于密碼輸入場景
    this.autocorrect = true,
    SmartDashesType? smartDashesType,
    SmartQuotesType? smartQuotesType,
    this.enableSuggestions = true,
    this.maxLines = 1,//輸入框的最大行數(shù)
    this.minLines,//最小行數(shù)
    this.expands = false,
    this.maxLength,//文本框的最大長度
    @Deprecated(
      'Use maxLengthEnforcement parameter which provides more specific '
      'behavior related to the maxLength limit. '
      'This feature was deprecated after v1.25.0-5.0.pre.',
    )
    this.maxLengthEnforced = true,
    this.maxLengthEnforcement,//當(dāng)文本長度超出文本框長度時(shí)如何處理
    this.onChanged,//輸入框改變時(shí)候的回調(diào)函數(shù)，也可以通過controller來監(jiān)聽
    this.onEditingComplete,//輸入完后觸發(fā)的回調(diào)函數(shù)，不接受參數(shù)
    this.onSubmitted,//接收ValueChanged<String>的參數(shù)
    this.onAppPrivateCommand,
    this.inputFormatters,//用于指定輸入格式,可以用于檢驗(yàn)格式
    this.enabled,//為bool時(shí)，輸入框?qū)⒆優(yōu)榻脿顟B(tài)
    this.cursorWidth = 2.0,//用于自定義輸入框光標(biāo)寬度
    this.cursorHeight,//用于自定義輸入框光標(biāo)高度
    this.cursorRadius,//用于自定義輸入框光標(biāo)圓角
    this.cursorColor,//用于自定義輸入框光標(biāo)顏色
    this.selectionHeightStyle = ui.BoxHeightStyle.tight,
    this.selectionWidthStyle = ui.BoxWidthStyle.tight,
    this.keyboardAppearance,//鍵盤外觀
    this.scrollPadding = const EdgeInsets.all(20.0),
    this.dragStartBehavior = DragStartBehavior.start,
    this.enableInteractiveSelection = true,
    this.selectionControls,
    this.onTap,//點(diǎn)擊事件
    this.mouseCursor,//鼠標(biāo)懸停。web可以了解
    this.buildCounter,//inputDecorator.counter自定義小工具
    this.scrollController,//滾動(dòng)控制器
    this.scrollPhysics,//滾動(dòng)物理效果
    this.autofillHints = const <String>[],//自動(dòng)填充
    this.clipBehavior = Clip.hardEdge,
    this.restorationId,
    this.enableIMEPersonalizedLearning = true,
  }) : assert(textAlign != null),
       assert(readOnly != null),
       assert(autofocus != null),
       assert(obscuringCharacter != null && obscuringCharacter.length == 1),
       assert(obscureText != null),
       assert(autocorrect != null),
       smartDashesType = smartDashesType ?? (obscureText ? SmartDashesType.disabled : SmartDashesType.enabled),
       smartQuotesType = smartQuotesType ?? (obscureText ? SmartQuotesType.disabled : SmartQuotesType.enabled),
       assert(enableSuggestions != null),
       assert(enableInteractiveSelection != null),
       assert(maxLengthEnforced != null),
       assert(
         maxLengthEnforced || maxLengthEnforcement == null,
         'maxLengthEnforced is deprecated, use only maxLengthEnforcement',
       ),
       assert(scrollPadding != null),
       assert(dragStartBehavior != null),
       assert(selectionHeightStyle != null),
       assert(selectionWidthStyle != null),
       assert(maxLines == null || maxLines > 0),
       assert(minLines == null || minLines > 0),
       assert(
         (maxLines == null) || (minLines == null) || (maxLines >= minLines),
         "minLines can't be greater than maxLines",
       ),
       assert(expands != null),
       assert(
         !expands || (maxLines == null && minLines == null),
         'minLines and maxLines must be null when expands is true.',
       ),
       assert(!obscureText || maxLines == 1, 'Obscured fields cannot be multiline.'),
       assert(maxLength == null || maxLength == TextField.noMaxLength || maxLength > 0),
       // Assert the following instead of setting it directly to avoid surprising the user by silently changing the value they set.
       assert(
         !identical(textInputAction, TextInputAction.newline) ||
         maxLines == 1 ||
         !identical(keyboardType, TextInputType.text),
         'Use keyboardType TextInputType.multiline when using TextInputAction.newline on a multiline TextField.',
       ),
       assert(clipBehavior != null),
       assert(enableIMEPersonalizedLearning != null),
       keyboardType = keyboardType ?? (maxLines == 1 ? TextInputType.text : TextInputType.multiline),
       toolbarOptions = toolbarOptions ?? (obscureText ?
         const ToolbarOptions(
           selectAll: true,
           paste: true,
         ) :
         const ToolbarOptions(
           copy: true,
           cut: true,
           selectAll: true,
           paste: true,
         )),
       super(key: key);

//定義一個(gè)controller
    TextEditingController _unameController = TextEditingController();
    _unameController.addListener(() {
      print("你輸入的內(nèi)容為${_unameController.text}");
    });
    return Scaffold(
        body: Center(
      child: TextField(
        //設(shè)置監(jiān)聽
        controller: _unameController,
        autofocus: true,
        keyboardType: TextInputType.text,
        decoration: InputDecoration(
          icon: Icon(Icons.person),
          labelText: "用戶名",
          hintText: "請(qǐng)輸入手機(jī)號(hào)",
          // errorText: "沒有輸入任何內(nèi)容"),
        ),
        maxLines: 1,
        //注意執(zhí)行順序onTap->onChanged->onEditingComplete->onSubmitted
        onTap: (){
          print("onTap");
        },
        onChanged: (string) {
          print("onChanged$string");
        },
        onEditingComplete: () {
          print("onEditingComplete");
        },
        onSubmitted: (string) {
          print("onSubmitted$string");
        },
      ),
    ));