/// <summary>Method to check if a filter item is already added based on the column to be filtered.
/// </summary>
/// <param name="column">The column to be checked if the list is already filtering.</param>
/// <param name="filterItem">The filter item to be checked.</param>
/// <returns>True if a filter item for a specific column or for ALL is already in the list.
/// </returns>
private bool IsAlreadyFiltering(int column, FilterItem filterItem)
{
// This would determine if Filter is already filtering ALL or a specified COLUMN.
foreach (FilterItem item in filterItems)
{
if (column == -1 && item.GetFilterType().Equals(filterItem.GetFilterType()))
{
return(true);
}
else
{
if (item.GetColumn() == filterItem.GetColumn())
{
return(true);
}
}
}
return(false);
}
/// <summary>Adds new filter item to the list.</summary>
/// <remarks>
/// Adds new filter item to the list. The filter will be used on the
/// specified column.
/// </remarks>
/// <param name="column">the target column for filtering.</param>
/// <param name="filter">the filter string.</param>
public virtual void Set(int column, string filter)
{
FilterItem filterItem = new FilterItem(column == -1 ? FilterType.All : FilterType.Column, column, filter);
if (IsAlreadyFiltering(column, filterItem))
{
if (TextUtils.IsEmpty(filter))
{
Remove(column, filterItem);
}
else
{
Update(column, filterItem);
}
}
else
{
if (!TextUtils.IsEmpty(filter))
{
Add(filterItem);
}
}
}
/// <summary>Adds new filter item to the list of this class.</summary>
/// <param name="filterItem">The filter item to be added to the list.</param>
private void Add(FilterItem filterItem)
{
filterItems.Add(filterItem);
tableView.Filter(this);
}