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