getPageNumbers method

List getPageNumbers({ required int paginationPage, required int numberOfPages, bool testMode = false, int? skip, int? limit, required dynamic onTap(int), })

Implementation

List getPageNumbers({
  required int paginationPage,
  required int numberOfPages,
  bool testMode = false,
  int? skip,
  int? limit,
  required Function(int) onTap,
}) {
  if (testMode == false) {
    assert(skip != null);
    assert(limit != null);
  }
  List<Widget> row = [];
  List<String> rowNames = []; // For testing

  void addRow(
      {required ButtonTypes type, required int pageNumber, required int i}) {
    Widget rowToAdd;
    String rowToAddTest;
    switch (type) {
      case ButtonTypes.left:
        rowToAddTest = type.name;
        rowToAdd = PaginationConstants.leftButton(
            pageNumber: pageNumber, onTap: onTap);
        break;
      case ButtonTypes.ellipsis:
        rowToAddTest = type.name;
        rowToAdd = PaginationConstants.ellipsisButton(
            pageNumber: pageNumber,
            numberOfPages: numberOfPages,
            skip: skip,
            onTap: onTap);
        break;
      case ButtonTypes.right:
        rowToAddTest = type.name;
        rowToAdd = PaginationConstants.rightButton(
            pageNumber: pageNumber, onTap: onTap);
        break;

      case ButtonTypes.number:
        rowToAddTest = '${pageNumber + 1}';
        rowToAdd = PaginationConstants.numberButton(
            pageNumber: pageNumber,
            numberOfPages: numberOfPages,
            i: i,
            skip: skip,
            onTap: onTap);
        break;
    }
    rowNames.add(rowToAddTest);
    row.add(rowToAdd);
  }

  // If numberOfPages is less than totalButtons, no pagination controls are needed
  if (numberOfPages <= PaginationConstants.totalButtons) {
    for (int i = 0; i < numberOfPages; i++) {
      addRow(type: ButtonTypes.number, pageNumber: i, i: i);
    }
  } else {
    for (int i = 0; i < PaginationConstants.totalButtons; i++) {
      switch (i) {
        case 0:
          addRow(
              type:
                  paginationPage > 0 ? ButtonTypes.left : ButtonTypes.number,
              pageNumber: paginationPage,
              i: i);
          break;
        case 1:
          int pageNumber = i;
          if (paginationPage > 1) {
            pageNumber = 0;
          } else if (paginationPage > 0 && i != 5) {
            pageNumber = i - 1;
          }
          addRow(type: ButtonTypes.number, pageNumber: pageNumber, i: i);
          break;
        case 2:
          int pageNumber = i;
          if (paginationPage > 2) {
            pageNumber = paginationPage - 1;
            if (paginationPage == (numberOfPages - 1)) {
              pageNumber = numberOfPages - 5;
            } else if (paginationPage > (numberOfPages - 4)) {
              pageNumber = numberOfPages - 4;
            }
          } else if (paginationPage > 0 && i != 5) {
            pageNumber = i - 1;
          }
          addRow(
              type: paginationPage > 2
                  ? ButtonTypes.ellipsis
                  : ButtonTypes.number,
              pageNumber: pageNumber,
              i: i);
          break;
        case 3:
          int pageNumber = paginationPage;
          if (paginationPage == 0) {
            pageNumber = i;
          } else if (paginationPage == 1 || paginationPage == 2) {
            pageNumber = 2;
          } else if (paginationPage == (numberOfPages - 1)) {
            pageNumber = numberOfPages - 4;
          } else if (paginationPage == (numberOfPages - 2)) {
            pageNumber = numberOfPages - 3;
          }
          addRow(type: ButtonTypes.number, pageNumber: pageNumber, i: i);
          break;
        case 4:
          int pageNumber = paginationPage;
          if (paginationPage < (numberOfPages - 3)) {
            pageNumber = paginationPage + 1;
            if (paginationPage == 0) {
              pageNumber = i;
            } else if (paginationPage < 3) {
              pageNumber = 3;
            }
          } else if (paginationPage == (numberOfPages - 1)) {
            pageNumber = paginationPage - 2;
          } else if (paginationPage == (numberOfPages - 2)) {
            pageNumber = paginationPage;
          } else if (paginationPage == (numberOfPages - 3)) {
            pageNumber = paginationPage + 1;
          }
          addRow(
              type: paginationPage < (numberOfPages - 3)
                  ? ButtonTypes.ellipsis
                  : ButtonTypes.number,
              pageNumber: pageNumber,
              i: i);
          break;
        case 5:
          int pageNumber = paginationPage + 2;
          if (paginationPage == (numberOfPages - 1)) {
            pageNumber = paginationPage - 1;
          } else if (paginationPage == (numberOfPages - 2)) {
            pageNumber = paginationPage + 1;
          } else if (i == 5) {
            pageNumber = numberOfPages - 1;
          }
          addRow(type: ButtonTypes.number, pageNumber: pageNumber, i: i);
          break;
        case 6:
          addRow(
              type: paginationPage < (numberOfPages - 1)
                  ? ButtonTypes.right
                  : ButtonTypes.number,
              pageNumber: paginationPage,
              i: i);
          break;
      }
    }
  }
  return testMode ? rowNames : row;
}