正则十八式-第四式 挫骨扬灰

Flutter大军来到，Container战将率领字符大军来到，师徒二人渐入绝境。

class Container extends StatelessWidget { 

 /// Creates a widget that combines common painting, positioning, and sizing widgets.  ///  

/// The `height` and `width` values include the padding.  ///  

/// The `color` argument is a shorthand for `decoration: new  /// 

BoxDecoration(color: color)`, which means you cannot supply both a `color`  

/// and a `decoration` argument. If you want to have both a `color` and a 

/// `decoration`, you can pass the color as the `color` argument to the

 /// `BoxDecoration`.  Container({    

Key key,    this.alignment,    this.padding,    Color color,    Decoration decoration,    this.foregroundDecoration,    double width,    double height,    BoxConstraints constraints,    

this.margin,    this.transform,    this.child,  }) : assert(margin == null || margin.isNonNegative),       assert(padding == null || padding.isNonNegative),       

assert(decoration == null || decoration.debugAssertIsValid()),       

assert(constraints == null || constraints.debugAssertIsValid()),       

assert(color == null || decoration == null,         

'Cannot provide both a color and a decoration\n'         

'The color argument is just a shorthand for "decoration: new BoxDecoration(color: color)".'       ),       decoration = decoration ?? (color != null ? BoxDecoration(color: color) : null),      

 constraints =        (width != null || height != null)         

 ? constraints?.tighten(width: width, height: height)            

?? BoxConstraints.tightFor(width: width, height: height)          : constraints,       super(key: key);  

/// The [child] contained by the container.  ///  

/// If null, and if the [constraints] are unbounded or also null, the 

  /// container will expand to fill all available space in its parent, unless  

/// the parent provides unbounded constraints, in which case the container  

/// will attempt to be as small as possible.  ///  

/// {@macro flutter.widgets.child}  final Widget child;  

/// Align the [child] within the container.  ///

  /// If non-null, the container will expand to fill its parent and position its  /// 

child within itself according to the given value. If the incoming  

/// constraints are unbounded, then the child will be shrink-wrapped instead.  /// 

  /// Ignored if [child] is null.  ///  

/// See also:  ///  

///  * [Alignment], a class with convenient constants typically used to  

///    specify an [AlignmentGeometry]. 

  ///  * [AlignmentDirectional], like [Alignment] for specifying alignments 

 ///    relative to text direction.  final AlignmentGeometry alignment;  

/// Empty space to inscribe inside the [decoration]. The [child], if any, is  

/// placed inside this padding.  /// 

  /// This padding is in addition to any padding inherent in the [decoration];  

/// see [Decoration.padding].  final EdgeInsetsGeometry padding;  

/// The decoration to paint behind the [child].  ///  

/// A shorthand for specifying just a solid color is available in the  

/// constructor: set the `color` argument instead of the `decoration`  

/// argument.  ///  

/// The [child] is not clipped to the decoration. To clip a child to the shape  

/// of a particular [ShapeDecoration], consider using a [ClipPath] widget.  final Decoration decoration;  /// The decoration to paint in front of the [child].  final Decoration foregroundDecoration;  

/// Additional constraints to apply to the child.  /// 

  /// The constructor `width` and `height` arguments are combined with the  

/// `constraints` argument to set this property.  /// 

  /// The [padding] goes inside the constraints.  final BoxConstraints constraints;  

/// Empty space to surround the [decoration] and [child].  final EdgeInsetsGeometry margin; 

  /// The transformation matrix to apply before painting the container.  final Matrix4 transform;

庙外，Container自报家门:吾乃Widget家族战将，Container，扇仙老儿速来一战。
捷特凌然出战，道一句:呔，吾师名号岂容汝等污秽。出手便是一招龙跃于渊，将对手团团围住，正在升龙之时。
Container一笑:这招不差，可惜火候不足 。仅一挣，就破了这招。

藏扇仙出，bgm起，以心传心:徒儿，为师现在深中灵蛛之毒，气力不济，这第四式也只能使出八成威力，而且只能使用一次。你能学到什么程度，还要看你造化。
只见庙前，藏扇仙身发蓝光，纳天地灵气，运气于掌，一时间飞沙走石，
呵道:正则十八式，第四式-挫骨... 雷电交加，天地共震，container瞬间粉身碎骨，留下了一堆渣渣。

Widget---child 

AlignmentGeometry---alignment 

EdgeInsetsGeometry---padding 

Decoration---decoration 

Decoration---foregroundDecoration 

BoxConstraints---constraints 

EdgeInsetsGeometry---margin Matrix4---transform

藏扇仙：...扬灰。

属性	属性类型
foregroundDecoration	Decoration
padding	EdgeInsetsGeometry
margin	EdgeInsetsGeometry
transform	Matrix4
alignment	AlignmentGeometry
decoration	Decoration
constraints	BoxConstraints
child	Widget

---

气劲回流，扇仙一口呕红，卧倒在地。捷特:师傅，你感觉如何？ 藏扇仙:无碍，这一式，你看得如何？ 捷特:这招太厉害了，不过不瞒您说……刚才风大，沙子迷眼了，没看清。”
此时远处渐现Text大旗，藏扇仙:唉，天意啊，天意，如今追兵已至，吾命休矣。
捷特:师傅莫灰心，从这残骸中，您的气劲尚存，我似能领略一二。您将Container中的属性与类型分离出来

private static void regexWidget(String target) {   

Map<String,String> fieldMap= new HashMap();    

String regex="final (?<type>\\w*) (?<name>\\w*);";    

Pattern pattern = Pattern.compile(regex);    

Matcher matcher = pattern.matcher(target);    

while (matcher.find()){        

fieldMap.put(matcher.group("name"),matcher.group("type"));    }    

createTable(fieldMap); }

然后将分理处的碎片进行重组,成为markdowon的字符串

private static void createTable(Map<String,String> fieldMap) {    

String title="属性 | 属性类型\n";    

String syb="---|---\n";  StringBuilder sb=  new StringBuilder(title);  

sb.append(syb);    fieldMap.forEach((k,v)->{        

sb.append(k).append("|").append(v).append("\n");    });    

System.out.println(sb.toString()); }

藏扇仙:“说得不差，这挫骨扬灰重在一挫，一扬。将对方粉碎后，提取有用信息，进行重建。”

属性 | 属性类型 ---|--- 

foregroundDecoration|Decoration 

padding|EdgeInsetsGeometry 

margin|EdgeInsetsGeometry 

transform|Matrix4 alignment|AlignmentGeometry 

decoration|Decoration constraints|BoxConstraints child|Widget

---

Text来到，派出TextStyle大将，捷特应战，便出一招挫骨扬灰

属性	属性类型
textBaseline	TextBaseline
backgroundColor	Color
decorationStyle	TextDecorationStyle
color	Color
wordSpacing	double
decorationThickness	double
letterSpacing	double
foreground	Paint
fontStyle	FontStyle
locale	Locale
decorationColor	Color
fontFamily	String
_package	String
background	Paint
inherit	bool
fontSize	double
debugLabel	String
decoration	TextDecoration
fontWeight	FontWeight
height	double

---

Text上阵，捷特应战，一招挫骨扬灰

属性	属性类型
softWrap	bool
data	String
textAlign	TextAlign
semanticsLabel	String
textWidthBasis	TextWidthBasis
locale	Locale
textDirection	TextDirection
textScaleFactor	double
overflow	TextOverflow
strutStyle	StrutStyle
maxLines	int
textSpan	InlineSpan
style	TextStyle

捷特:师傅，我似领悟了要诀，不知是否可以直攻widgets大本营，一举歼灭？ 

藏扇仙:你看这，火候欠佳，这渣子不太纯正，你还差得远呢。 

捷特:那第五式呢? 

藏扇仙:学会第五式-七进七出，你倒可以到Flutter的SDK找到widgets大本营， 

通过文件的循环读取，来个火烧连营，一举歼灭。