flutter layout code example

Example 1: flutter layout builder

var container = new Container(
  // Toggling width from 100 to 300 will change what is rendered
  // in the child container
  width: 100.0,
  // width: 300.0
  child: new LayoutBuilder(
    builder: (BuildContext context, BoxConstraints constraints) {
      if(constraints.maxWidth > 200.0) {
        return new Text('BIG');
      } else {
        return new Text('SMALL');
      }
    }
  ),
);

Example 2: align column to center of flex flutter

// If you want the whole table to be Centered, use the mainAxisAlignment property of Column.
///Column
mainAxisAlignment: MainAxisAlignment.center //Center Column contents vertically,
crossAxisAlignment: CrossAxisAlignment.center //Center Column contents horizontally,

///Row
mainAxisAlignment: MainAxisAlignment.center //Center Row contents horizontally,
crossAxisAlignment: CrossAxisAlignment.center //Center Row contents vertically,