正则十八式-第四式 挫骨扬灰

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;

Widget---child
AlignmentGeometry---alignment
EdgeInsetsGeometry---padding
Decoration---decoration
Decoration---foregroundDecoration
BoxConstraints---constraints
EdgeInsetsGeometry---margin
Matrix4---transform

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);
}

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());
}

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

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。