Flexible class

官方文档Flexible class

Flexible class

A widget that controls how a child of a Row, Column, or Flex flexes.

用于控制Row、Column、Flex子控件的控件。

Using a Flexible widget gives a child of a Row, Column, or Flex the flexibility to expand to fill the available space in the main axis (e.g., horizontally for a Row or vertically for a Column), but, unlike Expanded, Flexibledoes not require the child to fill the available space.

Flexible控件可以使一个Row、Column、Flex子控件提供扩展的灵活性，以填充主轴上的可用空间（例如，水平方向上的Row或者垂直方向上的Column）。但是与Expanded不同的是，Flexible不会要求子控件填充可用空间

A Flexible widget must be a descendant of a Row, Column, or Flex, and the path from the Flexible widget to its enclosing Row, Column, or Flex must contain only StatelessWidgets or StatefulWidgets (not other kinds of widgets, like RenderObjectWidgets).

Flexible必须是Row、Column、Flex的子控件，Flexible与装入它的Row、Column、Flex控件之间，只能是StatelessWidget或者StatefulWidget（不能是别的类型，比如RenderObjectWidget）。

See also:

• Expanded, which forces the child to expand to fill the available space.

• Spacer, a widget that takes up space proportional to it’s flex value.

• The catalog of layout widgets.

• Inheritance

  Object->Diagnosticable-> DiagnosticableTree ->Widget ->ProxyWidget->ParentDataWidget<Flex>-> Flexible

• Implementers

  Expanded