push method

void push(int pageIndex)

Implementation

void push(int pageIndex) {
  // Check if the last index is pushed again
  if (pageIndex == last)
    throw Exception("pageIndex pushed cannot be the same as the last index.");

  // If the the item pushed is not the first item
  if (pageIndex != first)
    // If the pushed item exist on the stack, remove it
    remove(pageIndex);

  // If the index pushed is the first index,
  else {
    // Remove it up to two times.
    this
      ..remove(pageIndex)
      ..remove(pageIndex);

    // Add it back to the first spot
    addFirst(pageIndex);
  }

  // Add index
  addLast(pageIndex);
}