private void UpdateMetadata()
{
var metadata = CreateMetadata();
if (Metadata != null && Metadata == metadata)
{
return;
}
Debug.WriteLine("UpdateMetadata()");
using (_updateMonitor.Enter())
Metadata = metadata;
}
private void ApplyMetadata(DataGridMetadata metadata)
{
if (metadata == null)
{
return;
}
Debug.WriteLine("ApplyMetadata()");
using (_applyMonitor.Enter())
{
int columnCount = AssociatedObject.Columns.Count;
var collectionView = AssociatedObject.Items as ICollectionView;
bool clearSortDescriptions = true;
foreach (var columnMetadata in metadata.ColumnMetadata)
{
if (columnMetadata.Index >= columnCount)
{
continue;
}
var column = AssociatedObject.Columns[columnMetadata.Index];
if (columnMetadata.DisplayIndex >= 0 && columnMetadata.DisplayIndex < columnCount)
{
column.DisplayIndex = columnMetadata.DisplayIndex;
}
column.Visibility = columnMetadata.Visibility;
column.SortDirection = columnMetadata.SortDirection;
column.Width = new DataGridLength(columnMetadata.Width);
if (collectionView == null || column.SortDirection == null)
{
continue;
}
if (clearSortDescriptions)
{
collectionView.SortDescriptions.Clear();
clearSortDescriptions = false;
}
var sortDescription = new SortDescription(column.SortMemberPath, column.SortDirection.Value);
collectionView.SortDescriptions.Add(sortDescription);
}
}
}
private void OnDataGridLoaded(object sender, RoutedEventArgs e)
{
// capture default values from xaml before applying any
_defaultMetadata = CreateMetadata();
_isLoaded = true;
AssociatedObject.Loaded -= OnDataGridLoaded;
if (Metadata == null)
{
UpdateMetadata();
}
else
{
ApplyMetadata(Metadata);
}
}
private DataGridMetadata CreateMetadata()
{
var metadata = new DataGridMetadata();
for (int index = 0; index < AssociatedObject.Columns.Count; index++)
{
var column = AssociatedObject.Columns[index];
var columnMetadata = new DataGridColumnMetadata
{
Index = index,
DisplayIndex = column.DisplayIndex,
Visibility = column.Visibility,
Width = column.ActualWidth,
SortDirection = column.SortDirection,
Header = column.Header == null ? "Column " + index : column.Header.ToString()
};
metadata.ColumnMetadata.Add(columnMetadata);
}
return(metadata);
}
