paint method

@override void paint(Context context)

Draw itself and its children, according to the calculated box.offset

Implementation

@override
void paint(Context context) {
  super.paint(context);

  final bf = PdfButtonField(
    rect: context.localToGlobal(box!),
    fieldName: name,
    flags: flags,
    fieldFlags: <PdfFieldFlags>{PdfFieldFlags.pushButton},
  );

  final mat = context.canvas.getTransform();
  final translation = Vector3(0, 0, 0);
  final rotation = Quaternion(0, 0, 0, 0);
  final scale = Vector3(0, 0, 0);
  mat
    ..decompose(translation, rotation, scale)
    ..leftTranslate(-translation.x, -translation.y)
    ..translate(box!.x, box!.y);

  var canvas = bf.appearance(context.document, PdfAnnotAppearance.normal,
      matrix: mat, boundingBox: box);
  Widget.draw(
    child!,
    offset: PdfPoint.zero,
    canvas: canvas,
    page: context.page,
    constraints:
        BoxConstraints.tightFor(width: box!.width, height: box!.height),
  );

  canvas = bf.appearance(context.document, PdfAnnotAppearance.down,
      matrix: mat, boundingBox: box);
  Widget.draw(
    _childDown,
    offset: PdfPoint.zero,
    canvas: canvas,
    page: context.page,
    constraints:
        BoxConstraints.tightFor(width: box!.width, height: box!.height),
  );

  canvas = bf.appearance(context.document, PdfAnnotAppearance.rollover,
      matrix: mat, boundingBox: box);
  Widget.draw(
    _childRollover,
    offset: PdfPoint.zero,
    canvas: canvas,
    page: context.page,
    constraints:
        BoxConstraints.tightFor(width: box!.width, height: box!.height),
  );

  PdfAnnot(context.page, bf);
}