all property

void all=(double value)

Sets the margins of all side.

//Creates a new PDF document.
PdfDocument document = PdfDocument()
  //Create and set new PDF margin.
  ..pageSettings.margins = (PdfMargins()..all = 20)
  ..pages.add().graphics.drawString(
      'Hello World!', PdfStandardFont(PdfFontFamily.helvetica, 12));
//Saves the document.
List<int> bytes = await document.save();
//Dispose the document.
document.dispose();

Implementation

// ignore: avoid_setters_without_getters
set all(double value) {
  if (!_helper.isPageAdded) {
    _helper.setMargins(value);
  }
}