private void OnScrollTimerTick(object sender, EventArgs e)
{
ScrollViewer scrollViewer = GetScrollViewer();
if (scrollViewer != null)
{
if (scrollSpeed < 0)
{
scrollViewer.LineUp();
}
else if (scrollSpeed > 0)
{
// if the last line is already visible, then we don't need to scroll any further.
bool scroll = true;
if (scrollViewer.VerticalOffset + 10 > scrollViewer.ScrollableHeight)
{
// This checks to see if the last row is really visible, and avoid a weird
// bouncing jump that happens if we keep calling LineDown without checking.
double height = scrollViewer.ActualHeight;
DataGridRow lastRow = this.GetRow(this.Items.Count - 1);
Point pos = lastRow.TransformToAncestor(scrollViewer).Transform(new Point(0, 0));
scroll = (pos.Y + lastRow.DesiredSize.Height > height + 16);
}
if (scroll)
{
scrollViewer.LineDown();
}
}
}
if (scrollTimer != null)
{
scrollTimer.Interval = TimeSpan.FromMilliseconds(nextInterval);
}
}
void ShowPopup(DataGridRow row)
{
stayDispatcherTimer.Stop();
UIElement popupTarget = null;
switch (this.Target)
{
case PopupPlacement.Window:
{
Window window = Window.GetWindow(row);
if (window != null && window.WindowState == WindowState.Maximized || window.WindowState == WindowState.Minimized)
{
this.PopupView.IsOpen = false;
return;
}
popupTarget = window;
}
break;
case PopupPlacement.DataGrid:
{
popupTarget = this.DataGrid;
}
break;
default:
break;
}
this.PopupView.PlacementTarget = popupTarget;
this.PopupView.DataContext = row.DataContext;
Point point = row.TransformToAncestor(popupTarget).Transform(new Point(0, 0));
this.PopupView.VerticalOffset = point.Y;
this.PopupView.IsOpen = true;
}
