EdgeInsetsDirectional.only constructor Null safety

const EdgeInsetsDirectional.only(
  1. {double start = 0.0,
  2. double top = 0.0,
  3. double end = 0.0,
  4. double bottom = 0.0}
)

Creates insets with only the given values non-zero.

link
A margin indent of 40 pixels on the leading side: 
const EdgeInsetsDirectional.only(start: 40.0)

Implementation

const EdgeInsetsDirectional.only({
  this.start = 0.0,
  this.top = 0.0,
  this.end = 0.0,
  this.bottom = 0.0,
});