/// <summary>
/// ResetFilterValues is called when the column is bound ColumnFilterHeader
/// </summary>
/// <param name="filterColumnInfo">Information about the column binding object</param>
internal void ResetFilterValues(FilterColumnInfo filterColumnInfo)
{
this.Visibility = System.Windows.Visibility.Collapsed;
if (Column != null)
{
foreach (var i in DistinctPropertyValues.Where(i => i.IsChecked))
i.IsChecked = false;
DistinctPropertyValues.Clear();
FilterText = string.Empty;
_boundColumnPropertyAccessor = null;
FilterColumnInfo = filterColumnInfo;
if (FilterColumnInfo.PropertyPath.Length > 0)
{
if (FilterColumnInfo.PropertyPath.Contains('.'))
throw new ArgumentException(string.Format("This version of the grid does not support a nested property path such as '{0}'. Please make a first-level property for filtering and bind to that.", FilterColumnInfo.PropertyPath));
this.Visibility = System.Windows.Visibility.Visible;
ParameterExpression arg = System.Linq.Expressions.Expression.Parameter(typeof(object), "x");
System.Linq.Expressions.Expression expr = System.Linq.Expressions.Expression.Convert(arg, Grid.FilterType);
expr = System.Linq.Expressions.Expression.Property(expr, Grid.FilterType, FilterColumnInfo.PropertyPath);
System.Linq.Expressions.Expression conversion = System.Linq.Expressions.Expression.Convert(expr, typeof(object));
_boundColumnPropertyAccessor = System.Linq.Expressions.Expression.Lambda<Func<object, object>>(conversion, arg).Compile();
}
else
{
this.Visibility = System.Windows.Visibility.Collapsed;
}
ConfigureFilterOptions();
}
}
//Simple helper method which creates the FilterColumnInfo object for a column. If a binding
//is defined for the column we use that. If that fails we fallback to using the SortMemberPath
private FilterColumnInfo CreateFilterColumnInfo(DataGridColumn column)
{
FilterColumnInfo col = new FilterColumnInfo();
DataGridBoundColumn boundColumn = column as DataGridBoundColumn;
if (column != null)
{
if (boundColumn != null)
{
col.PropertyPath = boundColumn.Binding.Path.Path;
col.PropertyType = FilterType.GetProperty(boundColumn.Binding.Path.Path).PropertyType;
col.Converter = boundColumn.Binding.Converter;
col.ConverterCultureInfo = boundColumn.Binding.ConverterCulture;
col.ConverterParameter = boundColumn.Binding.ConverterParameter;
}
else if (column.SortMemberPath.Length > 0)
{
col.PropertyPath = column.SortMemberPath;
col.PropertyType = FilterType.GetProperty(column.SortMemberPath).PropertyType;
}
}
return col;
}
/// <summary>
/// If a filterColumnInfo is set, the control is visible. As each ColumnOptionControl is loaded in the grid, the relating column
/// is used to build FilterColumnInfo for the control.
/// </summary>
/// <param name="filterColumnInfo">Binding information about the column</param>
internal void ResetOptionValues(FilterColumnInfo filterColumnInfo)
{
FilterColumnInfo = filterColumnInfo;
if (!CanGroup && !CanPin)
this.Visibility = System.Windows.Visibility.Collapsed;
else
{
if (!string.IsNullOrWhiteSpace(filterColumnInfo.PropertyPath))
this.Visibility = System.Windows.Visibility.Visible;
else
this.Visibility = System.Windows.Visibility.Collapsed;
}
}