protected override void OnPropertyChanged(DependencyPropertyChangedEventArgs e)
{
base.OnPropertyChanged(e);
if (e.Property == RowSelector.DataContextProperty)
{
Type rowType = null;
Row row = this.DataContext as Row;
if (row != null)
{
rowType = row.GetType();
}
else
{
HeaderFooterItem hfi = this.DataContext as HeaderFooterItem;
if (hfi != null)
{
row = hfi.AsVisual() as Row;
if (row != null)
{
rowType = row.GetType();
}
}
}
this.SetRowType(rowType);
}
}
private static bool IsContainerQualifying(
FrameworkElement container,
DataGridControl gridControl,
double offset,
double viewportSize,
double opposedOffset,
double opposedViewportSize,
Orientation panelOrientation)
{
bool retval = true;
HeaderFooterItem headerFooterItemContainer = container as HeaderFooterItem;
Row rowContainer = container as Row;
//Determine if the Element is Focusable or Navigable
if (headerFooterItemContainer != null)
{
rowContainer = headerFooterItemContainer.AsVisual() as Row;
if (rowContainer == null)
{
//If the HeaderFooter Item is not a Row and is Not focusable, then the item does not qualify.
UIElement uiElementContainer = headerFooterItemContainer.AsVisual() as UIElement;
if ((uiElementContainer == null) || (!uiElementContainer.Focusable))
{
retval = false;
}
}
}
//If the container is a Row (in the headers footers region or not )
if ((retval) && (rowContainer != null))
{
//and the Row is not navigable, then it does not qualify.
if (rowContainer.NavigationBehavior == NavigationBehavior.None)
{
retval = false;
}
}
//If the container still qualifies after first verification, check for the scrolling axis.
if (retval)
{
//if the PrimaryAxis requires the opposed axis to be fully visible.
if (((panelOrientation == Orientation.Vertical) && ((gridControl.ItemsPrimaryAxis == PrimaryAxis.Horizontal) || (gridControl.ItemsPrimaryAxis == PrimaryAxis.Both))) ||
((panelOrientation == Orientation.Horizontal) && ((gridControl.ItemsPrimaryAxis == PrimaryAxis.Vertical) || (gridControl.ItemsPrimaryAxis == PrimaryAxis.Both))))
{
FrameworkElement frameworkElementContainer = container as FrameworkElement;
//Somehow, I decided that a container that is not a FrameworkElement (extremelly highly unprobable) was automaticaly NOT to qualify if opposed axis was required.
if (frameworkElementContainer != null)
{
Vector rowOffset = VisualTreeHelper.GetOffset(frameworkElementContainer);
double computedOffset = (panelOrientation == Orientation.Vertical) ? rowOffset.X : rowOffset.Y;
double computedSize = (panelOrientation == Orientation.Vertical) ? frameworkElementContainer.ActualWidth : frameworkElementContainer.ActualHeight;
//if the coordinates of the Row are NOT inside the Scrolling Axis' viewport... then the item is not qualifyable.
if ((computedOffset < opposedOffset) || ((computedOffset + computedSize) > (opposedViewportSize + opposedOffset)))
{
retval = false;
}
}
else
{
retval = false;
}
}
}
return(retval);
}
