add method

void add({ int? count, PdfGridColumn? column, })

Adds the column into the collection.

//Create a new PDF document
PdfDocument document = PdfDocument();
//Create a PdfGrid
PdfGrid grid = PdfGrid();
//Create column to the PDF grid
PdfGridColumn column = PdfGridColumn(grid);
//Gets column form the PDF grid
PdfGridColumnCollection columns = grid.columns;
//Add columns to grid
columns.add(column: column);
columns.add(count: 2);
//Add headers to grid
grid.headers.add(1);
PdfGridRow header = grid.headers[0];
header.cells[0].value = 'Employee ID';
header.cells[1].value = 'Employee Name';
header.cells[2].value = 'Salary';
//Add rows to grid
PdfGridRow row1 = grid.rows.add();
row1.cells[0].value = 'E01';
row1.cells[1].value = 'Clay';
row1.cells[2].value = '\$10,000';
PdfGridRow row2 = grid.rows.add();
row2.cells[0].value = 'E02';
row2.cells[1].value = 'Simon';
row2.cells[2].value = '\$12,000';
//Set the width
grid.columns[1].width = 50;
//Set the column text format
grid.columns[0].format = PdfStringFormat(
    alignment: PdfTextAlignment.center,
    lineAlignment: PdfVerticalAlignment.bottom);
//Draw the grid in PDF document page
grid.draw(
    page: document.pages.add(), bounds: Rect.zero);
//Save the document.
List<int> bytes = await document.save();
//Dispose the document.
document.dispose();

Implementation

void add({int? count, PdfGridColumn? column}) {
  if (count == null && column == null) {
    final PdfGridColumn column = PdfGridColumn(_helper._grid);
    _helper._columns.add(column);
  } else {
    if (count != null) {
      for (int i = 0; i < count; i++) {
        _helper._columns.add(PdfGridColumn(_helper._grid));
        for (int i = 0; i < _helper._grid.rows.count; i++) {
          final PdfGridRow row = _helper._grid.rows[i];
          final PdfGridCell cell = PdfGridCell();
          cell.value = '';
          PdfGridCellCollectionHelper.getHelper(row.cells).add(cell);
        }
      }
    }
    if (column != null) {
      _helper._columns.add(column);
    }
  }
}