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Руководство Flutter Border

  1. Border
  2. Border.all constructor
  3. Border.fromBorderSide constructor
  4. Border.symmetric constructor

1. Border

Border создает границу для коробки, включая 4 края: top, bottom, left, right.
Border constructor
const Border (
    {BorderSide top: BorderSide.none,
    BorderSide right: BorderSide.none,
    BorderSide bottom: BorderSide.none,
    BorderSide left: BorderSide.none}
)
  • Руководство Flutter BorderSide
Например:
(ex1)
Container(
    width: 250,
    height: 200,
    decoration: BoxDecoration(
      border: Border(
        top: BorderSide(width: 15.0, color: Color(0xFFFF7F7F7F)),
        left: BorderSide(width: 20.0, color: Color(0xFFFFDFDFDF)),
        right: BorderSide(width: 5.0, color: Color(0xFFFF000000)),
        bottom: BorderSide(width: 10.0, color: Color(0xFFFF000000)),
      ),
    )
)
Например: Используем 2 вложенных Container и Border для имитации button:
(ex3)
Container(
  decoration:  BoxDecoration(
    border: Border(
      top: BorderSide(width: 1.0, color: Color(0xFFFFFFFFFF)),
      left: BorderSide(width: 1.0, color: Color(0xFFFFFFFFFF)),
      right: BorderSide(width: 1.0, color: Color(0xFFFF000000)),
      bottom: BorderSide(width: 1.0, color: Color(0xFFFF000000)),
    ),
  ),
  child: Container(
    width: 200,
    height: 50,
    padding:  EdgeInsets.symmetric(horizontal: 20.0, vertical: 2.0),
    alignment: Alignment.center,
    decoration: BoxDecoration(
      border: Border(
        top: BorderSide(width: 1.0, color: Color(0xFFFFDFDFDF)),
        left: BorderSide(width: 1.0, color: Color(0xFFFFDFDFDF)),
        right: BorderSide(width: 1.0, color: Color(0xFFFF7F7F7F)),
        bottom: BorderSide(width: 1.0, color: Color(0xFFFF7F7F7F)),
      ),
      color: Color(0xFFBFBFBF),
    ),
    child: Text(
        'OK',
        textAlign: TextAlign.center,
        style: TextStyle(color: Color(0xFF000000))
    ),
  ),
)

2. Border.all constructor

Конструктор Border.all создает согласованную границу (одинаковую для всех ребер) из параметров color,width и style.
Border.all constructor
Border.all(
  {Color color: const Color(0xFF000000),
  double width: 1.0,
  BorderStyle style: BorderStyle.solid}
)
Например:
Container(
    width: 250,
    height: 100,
    alignment: Alignment.center,
    decoration: BoxDecoration(
      border: Border.all(
          width: 5.0,
          color: Color(0xFFFF7F7F7F)
      ),
    ),
    child: Text("Flutter")
)

3. Border.fromBorderSide constructor

Конструктор Border.fromBorderSide создает согласованную границу (одинаковую для всех ребер) с параметрами, заданными объектом BorderSide.
Border.fromBorderSide constructor
const Border.fromBorderSide(
    BorderSide side
)
Например:
Container(
    width: 250,
    height: 100,
    alignment: Alignment.center,
    decoration: BoxDecoration(
      border: Border.fromBorderSide(
          BorderSide (
              width: 5,
              color: Colors.green,
              style: BorderStyle.solid
          )
      ),
    ),
    child: Text("Flutter")
)

4. Border.symmetric constructor

Конструктор Border.symmetric создает вертикально и горизонтально симметричную границу.
Параметр vertical применяется к ребрам left и right. Параметр horizontal применяется к ребрам top и bottom. Значения по умолчанию для параметров vertical и horizontal -BorderSide.none и not null.
Border.symmetric constructor
const Border.symmetric(
    {BorderSide vertical: BorderSide.none,
    BorderSide horizontal: BorderSide.none}
)
Например:
Container(
    width: 250,
    height: 100,
    alignment: Alignment.center,
    decoration: BoxDecoration(
      border: Border.symmetric (
        vertical: BorderSide (
            width: 5,
            color: Colors.green,
            style: BorderStyle.solid
        ),
        horizontal:  BorderSide (
            width: 3,
            color: Colors.blue,
            style: BorderStyle.solid
        ),
      ),
    ),
    child: Text("Flutter")
)

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