void DataColumn::addRow()
{
// Creates a pointer to a new DataRow and adds it to the end of the DataColumn
DataRow* newRow = new DataRow;
// If firstRow is NULL, list is empty so we need to make the firstRow
// Else append the new DataRow to the end of the DataColumn
if ( m_firstRow == NULL )
{
newRow->setNext(NULL);
newRow->setPrev(NULL);
m_firstRow = newRow;
m_lastRow = newRow;
}
else
{
newRow->setNext(NULL);
newRow->setPrev(m_lastRow);
m_lastRow->setNext(newRow);
m_lastRow = newRow;
}
// Sets the currentRow pointer to the newly created DataRow for editing purposes later on
m_currentRow = m_lastRow;
}
void DataColumn::removeAll()
{
// Removes all the rows within the DataColumn
if ( m_firstRow == NULL )
{
return;
}
DataRow* rowToDelete;
DataRow* currentRow = m_firstRow;
while ( currentRow->getNext() != NULL )
{
rowToDelete = currentRow;
currentRow = currentRow->getNext();
rowToDelete->setPrev(NULL);
rowToDelete->setNext(NULL);
rowToDelete->setText("");
delete rowToDelete;
}
m_firstRow = NULL;
m_lastRow = NULL;
m_currentRow = NULL;
}
void DataColumn::removeRow()
{
// Removes the current DataRow from the DataColumn and the
// currentRow pointer will be set to the DataRow after the DataRow you are deleting
if ( m_firstRow == NULL )
{
return;
}
DataRow* row;
// deals with the case if you only have one row in your DataColumn list
if ( m_firstRow == m_lastRow )
{
row = m_firstRow;
row->setNext(NULL);
row->setPrev(NULL);
row->setText("");
delete row;
m_firstRow = NULL;
m_lastRow = NULL;
m_currentRow = NULL;
return;
}
// deals with if the row up for deletion is the first row or the last row in the DataColumn list
if ( m_currentRow == m_firstRow )
{
row = m_firstRow;
m_firstRow = m_firstRow->getNext();
row->setNext(NULL);
row->setPrev(NULL);
row->setText("");
m_firstRow->setPrev(NULL);
m_currentRow = m_firstRow;
return;
}
else if ( m_currentRow == m_lastRow )
{
row = m_lastRow;
m_lastRow = m_lastRow->getPrev();
m_lastRow->setNext(NULL);
row->setNext(NULL);
row->setPrev(NULL);
row->setText("");
m_currentRow = m_lastRow;
delete row;
return;
}
// deals with a random DataRow in the DataColumn up for deletion
row = m_currentRow;
m_currentRow->getPrev()->setNext(m_currentRow->getNext());
m_currentRow->getNext()->setPrev(m_currentRow->getPrev());
row->setPrev(NULL);
row->setNext(NULL);
row->setText("");
m_currentRow = m_currentRow->getNext();
delete row;
}
