/// <summary>
/// If <paramref name="cellItem"/> is null, cell specific styles are not included.
/// </summary>
/// <param name="cellItem"></param>
/// <returns></returns>
internal string GetCellStyle(WebGridCellEx <T> cellItem)
{
if (cellItem == null)
{
throw new ArgumentNullException("cellItem");
}
var style = string.Join("", _conditionalStyles.Where(p => p.Key == null || p.Key(cellItem)).Select(p => p.Value));
return(style);
}
internal HelperResult GetCellHtml(WebGridCellEx <T> cellItem)
{
object result = null;
if (_conditionalCellHtml != null)
{
// First check for an explicitly true predicate, and then check for the null predicate
result = _conditionalCellHtml.Where(p => p.Key != null && p.Key(cellItem)).Select(p => p.Value(cellItem)).FirstOrDefault() ??
_conditionalCellHtml.Where(p => p.Key == null).Select(p => p.Value(cellItem)).FirstOrDefault();
}
if (result != null)
{
// We are done. One of the conditions was specified and result is the HTML
}
else if (MetaData == null)
{
// This column is not bound to a property. Empty HTML.
}
else if (cellItem.Value == null || cellItem.Value.ToString() == string.Empty)
{
// Value is null so NullDisplayText
result = MetaData.NullDisplayText;
}
else if (string.IsNullOrEmpty(MetaData.DisplayFormatString))
{
// DisplayFormatString not specified. Render the value as is.
result = cellItem.Value;
}
else
{
// Apply the DisplayFormatString
result = string.Format(MetaData.DisplayFormatString, cellItem.Value);
}
return(new HelperResult(tw =>
{
var helper = result as HelperResult;
if (helper != null)
{
helper.WriteTo(tw);
return;
}
var htmlString = result as IHtmlString;
if (htmlString != null)
{
tw.Write(htmlString);
return;
}
if (result != null)
{
tw.Write(HttpUtility.HtmlEncode(result));
}
}));
}
internal IDictionary <string, object> GetCellAttributes(WebGridCellEx <T> cellItem)
{
var dict = _attributesAccessor == null ? null : _attributesAccessor(cellItem);
if (_cellAttributes != null)
{
if (dict == null)
{
dict = new Dictionary <string, object>(_cellAttributes);
}
else
{
foreach (var item in _cellAttributes)
{
dict[item.Key] = item.Value;
}
}
}
return(dict);
}