/// <summary>
/// Applies all given transactions
/// </summary>
/// <param name="ops">Operation list</param>
private void ApplyTransaction(List <UndoRedoOperationBase> ops)
{
int i = 0;
while (i < ops.Count)
{
UndoRedoOperationBase r = ops[i];
DataRow row = r.Row;
switch (r.OperationType)
{
case UndoRedoOperationBaseType.NewRow:
UndoRedoRowOperation rowOp = (UndoRedoRowOperation)r;
DataTable sourceTable = rowOp.Table;
DataRow newRow = sourceTable.NewRow();
if (rowOp.WasDeleted)
{
RestoreRowFields(rowOp, newRow);
}
bool flag = true;
int j = i + 1;
while (flag & j < ops.Count)
{
if (ops[j].OperationType == UndoRedoOperationBaseType.ChangeField)
{
UndoRedoFieldOperation f = (UndoRedoFieldOperation)ops[j];
newRow[f.ColumnName] = f.NewValue;
i = j - 1;
}
else
{
flag = false;
}
j++;
}
sourceTable.Rows.Add(newRow);
for (int n = r.ID; n < m_operations.Count; ++n)
{
if (m_operations[n].Row == row)
{
m_operations[n].Row = newRow;
}
}
break;
case UndoRedoOperationBaseType.DeleteRow:
//((UndoRedoRowOperation)r).Table.Rows.Remove(row);
((UndoRedoRowOperation)r).Row.Delete();
break;
case UndoRedoOperationBaseType.ChangeField:
UndoRedoFieldOperation fieldOp = (UndoRedoFieldOperation)r;
row[fieldOp.ColumnName] = fieldOp.NewValue;
break;
}
i++;
}
}
/// <summary>
/// Restores all row fields saved in the transaction record's field-value collection.
/// </summary>
/// <param name="record"></param>
/// <param name="row"></param>
private void RestoreRowFields(UndoRedoRowOperation record, DataRow row)
{
foreach (DataColumn dc in row.Table.Columns)
{
row[dc] = record.GetValue(dc.ColumnName);
}
}
/// <summary>
/// Saves all row fields to the transaction record's field-value collection.
/// </summary>
/// <param name="record"></param>
/// <param name="row"></param>
private void SaveRowFields(UndoRedoRowOperation record, DataRow row)
{
foreach (DataColumn dc in row.Table.Columns)
{
try
{
record.AddColumnNameValuePair(dc.ColumnName, row[dc]);
}
catch
{ }
}
}
/// <summary>
/// The row deleting event fires when the row has being removed fro the collection.
/// We can't use the row deleted event to record the row field values because the row
/// has been then marked as deleted and accessing the fields throws an exception.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void OnRowDeleting(object sender, DataRowChangeEventArgs e)
{
if (m_doLogging)
{
UndoRedoRowOperation record = new UndoRedoRowOperation
(m_operations.Count, e.Row.Table, e.Row, UndoRedoOperationBaseType.DeleteRow);
if (m_trasaction)
{
record.TransactionId = curentTransactionID;
}
m_operations.Add(record);
SaveRowFields(record, e.Row);
OnRedoUndoOperationAdded(new UndoRedoEventArgs(record));
}
}
/// <summary>
/// Log the new row and add it to the uncommitted row collection.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void OnTableNewRow(object sender, DataTableNewRowEventArgs e)
{
if (m_doLogging)
{
int idx = m_operations.Count;
UndoRedoRowOperation record = new UndoRedoRowOperation
(idx, e.Row.Table, e.Row, UndoRedoOperationBaseType.NewRow);
if (m_trasaction)
{
record.TransactionId = curentTransactionID;
}
OnRedoUndoOperationAdding(new UndoRedoEventArgs(record));
m_operations.Add(record);
OnRedoUndoOperationAdded(new UndoRedoEventArgs(record));
List <int> rowIndices = new List <int>
{
idx
};
m_uncomittedRows.Add(e.Row, rowIndices);
}
}
