protected virtual void HandlePreviewTabKey(KeyEventArgs e)
{
if (e.Handled)
{
return;
}
DataGridContext dataGridContext = DataGridControl.GetDataGridContext(this);
if (dataGridContext == null)
{
return;
}
DataGridContext currentDataGridContext = dataGridContext.DataGridControl.CurrentContext;
if (currentDataGridContext == null)
{
return;
}
DependencyObject container = currentDataGridContext.GetContainerFromItem(currentDataGridContext.InternalCurrentItem);
if (container != null)
{
KeyboardNavigationMode tabbingMode = KeyboardNavigation.GetTabNavigation(container);
if (tabbingMode != KeyboardNavigationMode.None)
{
if ((Keyboard.Modifiers == ModifierKeys.None) || (Keyboard.Modifiers == ModifierKeys.Shift))
{
DataGridItemsHost.BringIntoViewKeyboardFocusedElement();
//Force the "inline" relayout of the panel
//This has no effect if the panel do not have to be updated.
this.UpdateLayout();
}
}
}
}
internal static UIElement GetItemsHostContainerFromElement(DataGridItemsHost itemsHost, DependencyObject element)
{
UIElement uiElement = element as UIElement;
// If the focused element is not a UIElement (e.g. : Hyperlink), we go up until we find one.
while ((uiElement == null) && (element != null))
{
element = TreeHelper.GetParent(element);
uiElement = element as UIElement;
}
if (uiElement == null)
{
return(null);
}
// Try to do a Contains before enumerating
// to avoid manually enumerating if we
// already have a container
if (itemsHost.Children.Contains(uiElement))
{
return(uiElement);
}
else
{
foreach (UIElement container in itemsHost.Children)
{
if (container.IsAncestorOf(uiElement))
{
return(container);
}
}
}
return(null);
}
protected virtual void HandleRightKey(KeyEventArgs e)
{
e.Handled = DataGridItemsHost.ProcessMoveFocus(e.Key);
}
protected virtual void HandlePreviewDownKey(KeyEventArgs e)
{
DataGridItemsHost.BringIntoViewKeyboardFocusedElement();
this.UpdateLayout();
}