LegendCellPadding.fromTRBLPx constructor
      const
      LegendCellPadding.fromTRBLPx()
     
    
Creates padding in pixels from the top, right, bottom, and left.
Implementation
const LegendCellPadding.fromTRBLPx(
  this.topPx,
  this.rightPx,
  this.bottomPx,
  this.leftPx,
)   : topPct = null,
      rightPct = null,
      bottomPct = null,
      leftPct = null;