private static DataGridCell GetCell(this DataGrid dataGrid, RowColumnIndex index)
{
if (index.Column < 0 || index.Column >= dataGrid.Columns.Count)
{
return(null);
}
if (index.Row < 0 || index.Row >= dataGrid.ItemContainerGenerator.Items.Count)
{
return(null);
}
var dataGridColumn = dataGrid.Columns[index.Column];
var row = (DataGridRow)dataGrid.ItemContainerGenerator.ContainerFromIndex(index.Row);
if (row != null)
{
var content = dataGridColumn.GetCellContent(row);
var cell = content.Ancestors()
.OfType <DataGridCell>()
.FirstOrDefault();
return(cell);
}
return(null);
}
/// <inheritdoc />
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
{
if (value is string text)
{
if (RowColumnIndex.TryParse(text, out var result))
{
return(result);
}
var message = $"Could not convert the string '{text}' to an instance of {typeof(RowColumnIndex)})";
throw new NotSupportedException(message);
}
return(base.ConvertFrom(context, culture, value));
}
private static void OnCellItemChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
if (Equals(d.GetValue(IsUpdatingProperty), BooleanBoxes.True))
{
return;
}
d.SetCurrentValue(IsUpdatingProperty, BooleanBoxes.True);
try
{
var dataGrid = (DataGrid)d;
dataGrid.UnselectAllCells();
if (e.NewValue == null)
{
dataGrid.SetIndex(null);
return;
}
for (var r = 0; r < dataGrid.Items.Count; r++)
{
for (var c = 0; c < dataGrid.Columns.Count; c++)
{
var column = dataGrid.Columns[c];
var cellItem = GetCellItem(column, dataGrid.Items[r]);
if (Equals(cellItem, e.NewValue))
{
var index = new RowColumnIndex(r, c);
dataGrid.SetIndex(index);
var cell = dataGrid.GetCell(index);
if (cell != null)
{
cell.SetCurrentValue(DataGridCell.IsSelectedProperty, true);
}
return;
}
}
}
dataGrid.SetIndex(null);
}
finally
{
d.SetCurrentValue(IsUpdatingProperty, BooleanBoxes.False);
}
}
