protected internal override void PrepareContainer(DataGridContext dataGridContext, object item)
{
base.PrepareContainer(dataGridContext, item);
if (dataGridContext.SelectedCellsStore.Contains(DataGridVirtualizingPanel.GetItemIndex(this.ParentRow), this.ParentColumn.VisiblePosition))
{
this.SetIsSelected(true);
}
}
private static void OnParentDataGridControlChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
DataGridVirtualizingPanel panel = ( DataGridVirtualizingPanel )sender;
if ((panel != null) && (e.NewValue == null) && (panel.m_customGenerator != null))
{
panel.m_customGenerator.ItemsChanged -= panel.OnCustomGeneratorItemsChanged;
panel.m_customGenerator = null;
panel.m_initializedCustomGenerator = false;
}
}
public void UpdateSelectedCellsInChangeOfDataGridContext()
{
var removedCellsRangeWithItems = new List <SelectionCellRangeWithItems>();
var unselectedCellsFromRemove = this.GetUnselectedCellsFromRemove(removedCellsRangeWithItems);
var ownerSelectedCells = m_owner.SelectedCellsStore;
for (int i = 0; i < m_sourceChanges.Count; i++)
{
var sourceChangeInfo = m_sourceChanges[i];
switch (sourceChangeInfo.Action)
{
case NotifyCollectionChangedAction.Add:
{
if (sourceChangeInfo.StartIndex != -1)
{
ownerSelectedCells.OffsetIndex(sourceChangeInfo.StartIndex, sourceChangeInfo.Count);
}
break;
}
case NotifyCollectionChangedAction.Remove:
break;
default:
throw new NotSupportedException("Only Add and Remove are supported.");
}
}
foreach (var cellRangeWithItems in removedCellsRangeWithItems)
{
ownerSelectedCells.Remove(cellRangeWithItems);
ownerSelectedCells.OffsetIndex(cellRangeWithItems.ItemRange.StartIndex, -cellRangeWithItems.ItemRange.Length);
}
if ((m_cellsToUnselect.Count > 0) || (m_cellsToSelect.Count > 0) || (unselectedCellsFromRemove.Any()))
{
var realizedDataRows = new Dictionary <int, DataRow>();
// Only want to update the realizedCells if the selection change is from user interaction and not
// from the source being updated. When the source is updated, the generator will recreate needed container,
// so the old one will have the correct selection state.
foreach (var container in m_owner.CustomItemContainerGenerator.RealizedContainers)
{
var dataRow = container as DataRow;
if ((dataRow != null) && (DataGridControl.GetDataGridContext(dataRow) == m_owner))
{
realizedDataRows[DataGridVirtualizingPanel.GetItemIndex(dataRow)] = dataRow;
}
}
// We use the ColumnsByVisiblePosition for when column are changing position, we want to have the state before the change.
var columnsByVisiblePositionLikedList = m_owner.ColumnsByVisiblePosition;
var columnIndex = 0;
var columnsVisiblePosition = new Dictionary <ColumnBase, int>(columnsByVisiblePositionLikedList.Count);
var columnNode = columnsByVisiblePositionLikedList.First;
while (columnNode != null)
{
columnsVisiblePosition.Add(columnNode.Value, columnIndex);
columnIndex++;
columnNode = columnNode.Next;
}
foreach (var cellRangeWithItems in m_cellsToUnselect)
{
this.SetIsSelectedOnDataCell(columnsVisiblePosition, realizedDataRows, cellRangeWithItems, false);
ownerSelectedCells.Remove(cellRangeWithItems);
}
foreach (var cellRangeWithItems in m_cellsToSelect)
{
this.SetIsSelectedOnDataCell(columnsVisiblePosition, realizedDataRows, cellRangeWithItems, true);
ownerSelectedCells.Add(cellRangeWithItems);
}
foreach (var cellRangeWithItems in unselectedCellsFromRemove)
{
m_cellsToUnselect.Add(cellRangeWithItems);
}
}
}
public void UpdateSelectedItemsInChangeOfDataGridContext()
{
var removedRangeWithItems = new List <SelectionRangeWithItems>();
var unselectedItemsFromRemove = this.GetUnselectedItemsFromRemove(removedRangeWithItems);
var ownerSelectedItems = m_owner.SelectedItemsStore;
for (int i = 0; i < m_sourceChanges.Count; i++)
{
var sourceChangeInfo = m_sourceChanges[i];
switch (sourceChangeInfo.Action)
{
case NotifyCollectionChangedAction.Add:
{
if (sourceChangeInfo.StartIndex != -1)
{
ownerSelectedItems.OffsetIndex(sourceChangeInfo.StartIndex, sourceChangeInfo.Count);
}
break;
}
case NotifyCollectionChangedAction.Remove:
break;
default:
throw new NotSupportedException("Only Add and Remove are supported.");
}
}
foreach (SelectionRangeWithItems rangeWithItems in removedRangeWithItems)
{
ownerSelectedItems.Remove(rangeWithItems);
ownerSelectedItems.OffsetIndex(rangeWithItems.Range.StartIndex, -rangeWithItems.Length);
}
for (int i = m_toDeferSelect.Count - 1; i >= 0; i--)
{
object item = m_toDeferSelect[i];
int itemIndex = m_owner.Items.IndexOf(item);
if (itemIndex >= 0)
{
if (!m_itemsToUnselect.Contains(itemIndex))
{
m_itemsToSelect.Add(new SelectionRangeWithItems(itemIndex, item));
}
m_toDeferSelect.RemoveAt(i);
}
}
if ((m_itemsToUnselect.Count > 0) || (m_itemsToSelect.Count > 0) || (unselectedItemsFromRemove.Any()))
{
var realizedDataRows = new Dictionary <int, DataRow>();
// Only want to update the realizedDataRows if the selection change is from user interaction and not
// from the source being updated. When the source is updated, the generator will recreate needed container,
// so the old one will have the correct selection state.
foreach (var container in m_owner.CustomItemContainerGenerator.RealizedContainers)
{
var dataRow = container as DataRow;
if ((dataRow != null) && (DataGridControl.GetDataGridContext(dataRow) == m_owner))
{
realizedDataRows[DataGridVirtualizingPanel.GetItemIndex(dataRow)] = dataRow;
}
}
var sourceItemIsDataRow = false;
foreach (var rangeWithItems in m_itemsToUnselect)
{
sourceItemIsDataRow |= this.SetIsSelectedOnDataRow(realizedDataRows, rangeWithItems, false);
ownerSelectedItems.Remove(rangeWithItems);
}
foreach (var rangeWithItems in m_itemsToSelect)
{
sourceItemIsDataRow |= this.SetIsSelectedOnDataRow(realizedDataRows, rangeWithItems, true);
ownerSelectedItems.Add(rangeWithItems);
}
foreach (var rangeWithItems in unselectedItemsFromRemove)
{
m_itemsToUnselect.Add(rangeWithItems);
}
if (!sourceItemIsDataRow)
{
foreach (var realizedItemPair in realizedDataRows)
{
if (ownerSelectedItems.Contains(new SelectionRange(realizedItemPair.Key)))
{
realizedItemPair.Value.SetIsSelected(true);
}
else
{
realizedItemPair.Value.SetIsSelected(false);
}
}
}
}
}