private void ClearChangeIndicator()
{
DataGridAutomationPeer automationPeer = (DataGridAutomationPeer)DataGridAutomationPeer.CreatePeerForElement(NodeMetadataDataGrid);
// Get the DataGridRowsPresenterAutomationPeer so we can find the rows in the data grid...
DataGridRowsPresenterAutomationPeer dataGridRowsPresenterAutomationPeer = automationPeer.GetChildren().
Where(a => (a is DataGridRowsPresenterAutomationPeer)).
Select(a => (a as DataGridRowsPresenterAutomationPeer)).
FirstOrDefault();
if (null != dataGridRowsPresenterAutomationPeer)
{
foreach (var item in dataGridRowsPresenterAutomationPeer.GetChildren())
{
// loop to find the DataGridCellAutomationPeer from which we can interrogate the owner -- which is a DataGridRow
foreach (var subitem in (item as DataGridItemAutomationPeer).GetChildren())
{
if ((subitem is DataGridCellAutomationPeer))
{
// At last -- the only public method for finding a row....
DataGridRow row = DataGridRow.GetRowContainingElement(((subitem as DataGridCellAutomationPeer).Owner as FrameworkElement));
row.Foreground = new SolidColorBrush(Colors.Black);
}
}
}
}
}
/// <summary>
/// Scrolls a DataGridRow into view.
/// </summary>
/// <param name="itemsControl">The DataGrid containing the row.</param>
/// <param name="itemContainer">The DataGridRow object.</param>
protected override void ScrollIntoView(DataGrid itemsControl, DataGridRow itemContainer)
{
IScrollProvider scrollInfo = (IScrollProvider)DataGridAutomationPeer.CreatePeerForElement(itemsControl);
double horizontalScrollPercentBeforeScroll = scrollInfo.HorizontalScrollPercent;
double verticalScrollPercentBeforeScroll = scrollInfo.VerticalScrollPercent;
itemsControl.ScrollIntoView(itemContainer.DataContext, null);
double horizontalScrollPercentAfterScroll = scrollInfo.HorizontalScrollPercent;
double verticalScrollPercentAfterScroll = scrollInfo.VerticalScrollPercent;
double horizontalDiff = horizontalScrollPercentAfterScroll - horizontalScrollPercentBeforeScroll;
double verticalDiff = verticalScrollPercentAfterScroll - verticalScrollPercentBeforeScroll;
scrollInfo.SetScrollPercent(scrollInfo.HorizontalScrollPercent + (horizontalDiff / 2.0), scrollInfo.VerticalScrollPercent + (verticalDiff / 2.0));
}
static void EnsureRowVisible(DataGrid grid, int itemIndex)
{
grid.ScrollIntoView(grid.Items[itemIndex]);
grid.UpdateLayout();
if (grid.ItemContainerGenerator.ContainerFromIndex(itemIndex) == null)
{
DataGridAutomationPeer peer = new DataGridAutomationPeer(grid);
var scroll = peer.GetPattern(PatternInterface.Scroll) as IScrollProvider;
scroll.SetScrollPercent(scroll.HorizontalScrollPercent, 0);
grid.UpdateLayout();
while (grid.ItemContainerGenerator.ContainerFromIndex(itemIndex) == null)
{
scroll.Scroll(ScrollAmount.NoAmount, ScrollAmount.LargeIncrement);
grid.UpdateLayout();
}
}
}
public DataGridRow GetDataGridRowByDataContext(DataGrid dataGrid, object dataContext)
{
if (null != dataContext)
{
DataGridAutomationPeer automationPeer = (DataGridAutomationPeer)DataGridAutomationPeer.CreatePeerForElement(dataGrid);
// Get the DataGridRowsPresenterAutomationPeer so we can find the rows in the data grid...
DataGridRowsPresenterAutomationPeer dataGridRowsPresenterAutomationPeer = automationPeer.GetChildren().
Where(a => (a is DataGridRowsPresenterAutomationPeer)).
Select(a => (a as DataGridRowsPresenterAutomationPeer)).
FirstOrDefault();
if (null != dataGridRowsPresenterAutomationPeer)
{
foreach (var item in dataGridRowsPresenterAutomationPeer.GetChildren())
{
// loop to find the DataGridCellAutomationPeer from which we can interrogate the owner -- which is a DataGridRow
foreach (var subitem in (item as DataGridItemAutomationPeer).GetChildren())
{
if ((subitem is DataGridCellAutomationPeer))
{
// At last -- the only public method for finding a row....
DataGridRow row = DataGridRow.GetRowContainingElement(((subitem as DataGridCellAutomationPeer).Owner as FrameworkElement));
// check this row to see if it is bound to the requested dataContext.
if ((row.DataContext) == dataContext)
{
return(row);
}
break; // Only need to check one cell in each row
}
}
}
}
}
return(null);
}
private static void OnIsSelectedChanged(object sender, DependencyPropertyChangedEventArgs e)
{
DataGridRow row = (DataGridRow)sender;
bool isSelected = (bool)e.NewValue;
if (isSelected && !row.IsSelectable)
{
throw new InvalidOperationException(SR.Get(SRID.DataGridRow_CannotSelectRowWhenCells));
}
DataGrid grid = row.DataGridOwner;
if (grid != null && row.DataContext != null)
{
DataGridAutomationPeer gridPeer = UIElementAutomationPeer.FromElement(grid) as DataGridAutomationPeer;
if (gridPeer != null)
{
DataGridItemAutomationPeer rowItemPeer = gridPeer.GetOrCreateItemPeer(row.DataContext);
if (rowItemPeer != null)
{
rowItemPeer.RaisePropertyChangedEvent(
System.Windows.Automation.SelectionItemPatternIdentifiers.IsSelectedProperty,
(bool)e.OldValue,
isSelected);
}
}
}
// Update the header's IsRowSelected property
row.NotifyPropertyChanged(row, e, NotificationTarget.Rows | NotificationTarget.RowHeaders);
// This will raise the appropriate selection event, which will
// bubble to the DataGrid. The base class Selector code will listen
// for these events and will update SelectedItems as necessary.
row.RaiseSelectionChangedEvent(isSelected);
}
private void ProcessSort()
{
if (this.OwningColumn != null &&
this.OwningGrid != null &&
this.OwningGrid.EditingRow == null &&
this.OwningColumn != this.OwningGrid.ColumnsInternal.FillerColumn &&
this.OwningGrid.CanUserSortColumns &&
this.OwningColumn.CanUserSort)
{
DataGridColumnEventArgs ea = new DataGridColumnEventArgs(this.OwningColumn);
this.OwningGrid.OnColumnSorting(ea);
#if FEATURE_ICOLLECTIONVIEW_SORT
if (!ea.Handled && this.OwningGrid.DataConnection.AllowSort && this.OwningGrid.DataConnection.SortDescriptions != null)
{
// - DataConnection.AllowSort is true, and
// - SortDescriptionsCollection exists, and
// - the column's data type is comparable
DataGrid owningGrid = this.OwningGrid;
ListSortDirection newSortDirection;
SortDescription newSort;
bool ctrl;
bool shift;
KeyboardHelper.GetMetaKeyState(out ctrl, out shift);
SortDescription?sort = this.OwningColumn.GetSortDescription();
ICollectionView collectionView = owningGrid.DataConnection.CollectionView;
Debug.Assert(collectionView != null);
try
{
owningGrid.OnUserSorting();
using (collectionView.DeferRefresh())
{
// If shift is held down, we multi-sort, therefore if it isn't, we'll clear the sorts beforehand
if (!shift || owningGrid.DataConnection.SortDescriptions.Count == 0)
{
if (collectionView.CanGroup && collectionView.GroupDescriptions != null)
{
// Make sure we sort by the GroupDescriptions first
for (int i = 0; i < collectionView.GroupDescriptions.Count; i++)
{
PropertyGroupDescription groupDescription = collectionView.GroupDescriptions[i] as PropertyGroupDescription;
if (groupDescription != null && collectionView.SortDescriptions.Count <= i || collectionView.SortDescriptions[i].PropertyName != groupDescription.PropertyName)
{
collectionView.SortDescriptions.Insert(Math.Min(i, collectionView.SortDescriptions.Count), new SortDescription(groupDescription.PropertyName, ListSortDirection.Ascending));
}
}
while (collectionView.SortDescriptions.Count > collectionView.GroupDescriptions.Count)
{
collectionView.SortDescriptions.RemoveAt(collectionView.GroupDescriptions.Count);
}
}
else if (!shift)
{
owningGrid.DataConnection.SortDescriptions.Clear();
}
}
if (sort.HasValue)
{
// swap direction
switch (sort.Value.Direction)
{
case ListSortDirection.Ascending:
newSortDirection = ListSortDirection.Descending;
break;
default:
newSortDirection = ListSortDirection.Ascending;
break;
}
newSort = new SortDescription(sort.Value.PropertyName, newSortDirection);
// changing direction should not affect sort order, so we replace this column's
// sort description instead of just adding it to the end of the collection
int oldIndex = owningGrid.DataConnection.SortDescriptions.IndexOf(sort.Value);
if (oldIndex >= 0)
{
owningGrid.DataConnection.SortDescriptions.Remove(sort.Value);
owningGrid.DataConnection.SortDescriptions.Insert(oldIndex, newSort);
}
else
{
owningGrid.DataConnection.SortDescriptions.Add(newSort);
}
}
else
{
// start new sort
newSortDirection = ListSortDirection.Ascending;
string propertyName = this.OwningColumn.GetSortPropertyName();
// no-opt if we couldn't find a property to sort on
if (string.IsNullOrEmpty(propertyName))
{
return;
}
newSort = new SortDescription(propertyName, newSortDirection);
owningGrid.DataConnection.SortDescriptions.Add(newSort);
}
}
}
finally
{
owningGrid.OnUserSorted();
}
sortProcessed = true;
}
#endif
// Send the Invoked event for the column header's automation peer.
DataGridAutomationPeer.RaiseAutomationInvokeEvent(this);
}
}
