private static bool SetFixedTranslateTransformCore(FrameworkElement element, bool canScrollHorizontally)
{
Debug.Assert(element != null);
var parentScrollViewer = TableViewScrollViewer.GetParentScrollViewer(element) as ScrollViewer;
if (parentScrollViewer == null)
{
return(false);
}
var fixedTransform = TableViewScrollViewer.GetStoredFixedTransform(parentScrollViewer);
Debug.Assert(fixedTransform != null);
if (canScrollHorizontally)
{
if (element.RenderTransform == fixedTransform)
{
element.ClearValue(UIElement.RenderTransformProperty);
}
}
else
{
element.RenderTransform = fixedTransform;
}
return(true);
}
private static void OnCanScrollHorizontallyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
// This property makes sense (only works) for potentially visible element; UIElement.
var element = sender as FrameworkElement;
if (element == null)
{
return;
}
TableViewScrollViewer.SetFixedTranslateTransform(element, ( bool )e.NewValue);
}
internal static Transform GetStoredFixedTransform(ScrollViewer obj)
{
Transform actualValue = ( Transform )obj.GetValue(TableViewScrollViewer.StoredFixedTransformProperty);
if (actualValue == null)
{
actualValue = TableViewScrollViewer.CreateFixedPanelTransform(obj);
TableViewScrollViewer.SetStoredFixedTransform(obj, actualValue);
}
return(actualValue);
}
private static void OnFixedElementLoaded(object sender, RoutedEventArgs e)
{
var element = sender as FrameworkElement;
if (element == null)
{
return;
}
element.Loaded -= new RoutedEventHandler(TableViewScrollViewer.OnFixedElementLoaded);
TableViewScrollViewer.SetFixedTranslateTransformCore(element, TableView.GetCanScrollHorizontally(element));
}
internal static TableViewScrollViewer GetParentTableViewScrollViewer(DependencyObject obj)
{
DependencyObject parent = TreeHelper.GetParent(obj);
TableViewScrollViewer parentScrollViewer = parent as TableViewScrollViewer;
while ((parent != null) && (parentScrollViewer == null))
{
parent = TreeHelper.GetParent(parent);
parentScrollViewer = parent as TableViewScrollViewer;
}
return(parentScrollViewer);
}
internal static void SetFixedTranslateTransform(FrameworkElement element, bool canScrollHorizontally)
{
if (element == null)
{
throw new ArgumentNullException("element");
}
if (!TableViewScrollViewer.SetFixedTranslateTransformCore(element, canScrollHorizontally))
{
if (!element.IsLoaded)
{
// The method failed to apply the translate transform because it could not find a ScrollViewer
// among its ancestors. Try again when the element will be loaded in case it wasn't in the
// VisualTree.
element.Loaded += new RoutedEventHandler(TableViewScrollViewer.OnFixedElementLoaded);
}
}
}
protected override Size ArrangeOverride(Size arrangeSize)
{
Size finalSize = base.ArrangeOverride(arrangeSize);
DataGridContext dataGridContext = DataGridControl.GetDataGridContext(this);
DataGridControl dataGridControl = (dataGridContext != null)
? dataGridContext.DataGridControl
: null;
RowSelectorPane rowSelectorPane = null;
// dataGridControl can be null in design-time
if (dataGridControl != null)
{
TableViewScrollViewer scrollViewer = dataGridControl.ScrollViewer as TableViewScrollViewer;
rowSelectorPane = (scrollViewer != null) ? scrollViewer.RowSelectorPane : null;
}
if (rowSelectorPane == null)
{
return(finalSize);
}
Visibility rowSelectorPaneVisibility = ( Visibility )rowSelectorPane.GetValue(RowSelectorPane.VisibilityProperty);
if (rowSelectorPaneVisibility != Visibility.Visible)
{
return(finalSize);
}
foreach (UIElement child in this.InternalChildren)
{
Vector offset = VisualTreeHelper.GetOffset(child);
Size desiredSize = child.DesiredSize;
rowSelectorPane.SetRowSelectorPosition(child, new Rect(offset.X, offset.Y, desiredSize.Width, desiredSize.Height), this);
}
return(finalSize);
}
private void UpdateChildScrollViewers()
{
bool isAtTop = (this.VerticalOffset == 0);
bool isAtLeft = (this.HorizontalOffset == 0);
bool isAtBottom = ((this.VerticalOffset + this.ViewportHeight) == this.ExtentHeight);
bool isAtRight = ((this.HorizontalOffset + this.ViewportWidth) == this.ExtentWidth);
foreach (SynchronizedScrollViewer scrollViewer in m_childScrollViewers)
{
SynchronizedScrollViewerPosition position = TableViewScrollViewer.GetSynchronizedScrollViewerPosition(scrollViewer);
bool handled = false;
switch (position)
{
case SynchronizedScrollViewerPosition.Top:
if (isAtTop == true)
{
KeyboardNavigation.SetDirectionalNavigation(scrollViewer, KeyboardNavigationMode.Continue);
KeyboardNavigation.SetTabNavigation(scrollViewer, KeyboardNavigationMode.Continue);
handled = true;
}
break;
case SynchronizedScrollViewerPosition.Bottom:
if (isAtBottom == true)
{
KeyboardNavigation.SetDirectionalNavigation(scrollViewer, KeyboardNavigationMode.Continue);
KeyboardNavigation.SetTabNavigation(scrollViewer, KeyboardNavigationMode.Continue);
handled = true;
}
break;
case SynchronizedScrollViewerPosition.Left:
if (isAtLeft == true)
{
KeyboardNavigation.SetDirectionalNavigation(scrollViewer, KeyboardNavigationMode.Continue);
KeyboardNavigation.SetTabNavigation(scrollViewer, KeyboardNavigationMode.Continue);
handled = true;
}
break;
case SynchronizedScrollViewerPosition.Right:
if (isAtRight == true)
{
KeyboardNavigation.SetDirectionalNavigation(scrollViewer, KeyboardNavigationMode.Continue);
KeyboardNavigation.SetTabNavigation(scrollViewer, KeyboardNavigationMode.Continue);
handled = true;
}
break;
case SynchronizedScrollViewerPosition.None:
default:
break;
}
if (handled == false)
{
KeyboardNavigation.SetDirectionalNavigation(scrollViewer, KeyboardNavigationMode.None);
KeyboardNavigation.SetTabNavigation(scrollViewer, KeyboardNavigationMode.None);
}
}
}
