const MediaQueryData({Size size: Size.zero, double devicePixelRatio: 1.0, double textScaleFactor: 1.0, EdgeInsets padding: EdgeInsets.zero })

Creates data for a media query with explicit values.

Consider using MediaQueryData.fromWindow to create data based on a ui.Window.

Source 

const MediaQueryData({
  this.size: Size.zero,
  this.devicePixelRatio: 1.0,
  this.textScaleFactor: 1.0,
  this.padding: EdgeInsets.zero
});