internal override void OnEditBegun(DataGridItemEventArgs e)
{
object item = e.Item;
DataGridPageManagerBase pageManager = this.RootGroup.GetVirtualPageManager();
if (!pageManager.IsItemDirty(item))
{
// First time we enter edit on this item.
DataGridItemPropertyCollection itemProperties = this.ItemProperties;
int count = itemProperties.Count;
string[] propertyNames = new string[count];
object[] cachedValues = new object[count];
for (int i = 0; i < count; i++)
{
DataGridItemPropertyBase itemProperty = itemProperties[i];
propertyNames[i] = itemProperty.Name;
cachedValues[i] = itemProperty.GetValue(item);
}
// Cache the values of the never edited before row. This will help the developer find the corresponding row
// in the source when times comes to commit the changes to the data source.
pageManager.SetCachedValuesForItem(item, propertyNames, cachedValues);
}
base.OnEditBegun(e);
}
public override object GetValue(object component)
{
DataGridItemPropertyBase dataGridItemProperty = this.DataGridItemProperty;
if (dataGridItemProperty == null)
{
return(null);
}
return(dataGridItemProperty.GetValue(base.GetValue(component)));
}
public int Compare(RawItem xRawItem, RawItem yRawItem)
{
if (xRawItem == null)
{
if (yRawItem == null)
{
return(0);
}
else
{
return(-1);
}
}
else
{
if (yRawItem == null)
{
return(1);
}
}
ListSortDirection lastSortDirection = ListSortDirection.Ascending;
SortDescriptionCollection sortDescriptions = m_collectionView.SortDescriptions;
int sortDescriptionCount = sortDescriptions.Count;
if (sortDescriptionCount > 0)
{
int result;
DataGridItemPropertyCollection itemProperties = m_collectionView.ItemProperties;
for (int i = 0; i < sortDescriptionCount; i++)
{
SortDescription sortDescription = sortDescriptions[i];
lastSortDirection = sortDescription.Direction;
DataGridItemPropertyBase dataProperty = itemProperties[sortDescription.PropertyName];
if (dataProperty == null)
{
continue;
}
ISupportInitialize supportInitialize = dataProperty as ISupportInitialize;
object xData = null;
object yData = null;
if (supportInitialize != null)
{
supportInitialize.BeginInit();
}
try
{
xData = dataProperty.GetValue(xRawItem.DataItem);
yData = dataProperty.GetValue(yRawItem.DataItem);
}
finally
{
if (supportInitialize != null)
{
supportInitialize.EndInit();
}
}
IComparer sortComparer = dataProperty.SortComparer;
if (sortComparer != null)
{
result = sortComparer.Compare(xData, yData);
}
else
{
result = ObjectDataStore.CompareData(xData, yData);
}
if (result != 0)
{
if (lastSortDirection == ListSortDirection.Descending)
{
result = -result;
}
return(result);
}
}
}
if (lastSortDirection == ListSortDirection.Descending)
{
return(yRawItem.Index - xRawItem.Index);
}
return(xRawItem.Index - yRawItem.Index);
}
