public static void PageRight(this ScrollViewer viewer)
{
if (viewer == null)
{
throw new ArgumentNullException("viewer");
}
ScrollViewerExtensions.ScrollByHorizontalOffset(viewer, viewer.ViewportWidth);
}
public static void PageDown(this ScrollViewer viewer)
{
if (viewer == null)
{
throw new ArgumentNullException("viewer");
}
ScrollViewerExtensions.ScrollByVerticalOffset(viewer, viewer.ViewportHeight);
}
public static void LineRight(this ScrollViewer viewer)
{
if (viewer == null)
{
throw new ArgumentNullException("viewer");
}
ScrollViewerExtensions.ScrollByHorizontalOffset(viewer, 16.0);
}
public static void LineUp(this ScrollViewer viewer)
{
if (viewer == null)
{
throw new ArgumentNullException("viewer");
}
ScrollViewerExtensions.ScrollByVerticalOffset(viewer, -16.0);
}
public static void ScrollIntoView(this ScrollViewer viewer, FrameworkElement element)
{
if (viewer == null)
{
throw new ArgumentNullException("viewer");
}
if (element == null)
{
throw new ArgumentNullException("element");
}
ScrollViewerExtensions.ScrollIntoView(viewer, element, 0.0, 0.0, (Duration)TimeSpan.Zero);
}
private static void OnMouseWheel(object sender, MouseWheelEventArgs e)
{
ScrollViewer viewer = sender as ScrollViewer;
if (e.Handled)
{
return;
}
double offset = ScrollViewerExtensions.CoerceVerticalOffset(viewer, viewer.VerticalOffset - (double)e.Delta);
viewer.ScrollToVerticalOffset(offset);
e.Handled = true;
}
public static void ScrollIntoView(this ScrollViewer viewer, FrameworkElement element, double horizontalMargin, double verticalMargin, Duration duration)
{
if (viewer == null)
{
throw new ArgumentNullException("viewer");
}
if (element == null)
{
throw new ArgumentNullException("element");
}
Rect?boundsRelativeTo = VisualTreeExtensions.GetBoundsRelativeTo(element, (UIElement)viewer);
if (!boundsRelativeTo.HasValue)
{
return;
}
double verticalOffset = viewer.VerticalOffset;
double num1 = 0.0;
double viewportHeight = viewer.ViewportHeight;
double num2 = boundsRelativeTo.Value.Bottom + verticalMargin;
if (viewportHeight < num2)
{
num1 = num2 - viewportHeight;
verticalOffset += num1;
}
double num3 = boundsRelativeTo.Value.Top - verticalMargin;
if (num3 - num1 < 0.0)
{
verticalOffset -= num1 - num3;
}
double horizontalOffset = viewer.HorizontalOffset;
double num4 = 0.0;
double viewportWidth = viewer.ViewportWidth;
double num5 = boundsRelativeTo.Value.Right + horizontalMargin;
if (viewportWidth < num5)
{
num4 = num5 - viewportWidth;
horizontalOffset += num4;
}
double num6 = boundsRelativeTo.Value.Left - horizontalMargin;
if (num6 - num4 < 0.0)
{
horizontalOffset -= num4 - num6;
}
if (duration == (Duration)TimeSpan.Zero)
{
viewer.ScrollToVerticalOffset(verticalOffset);
viewer.ScrollToHorizontalOffset(horizontalOffset);
}
else
{
Storyboard storyboard = new Storyboard();
ScrollViewerExtensions.SetVerticalOffset(viewer, viewer.VerticalOffset);
ScrollViewerExtensions.SetHorizontalOffset(viewer, viewer.HorizontalOffset);
DoubleAnimation doubleAnimation1 = new DoubleAnimation();
doubleAnimation1.To = new double?(verticalOffset);
doubleAnimation1.Duration = duration;
DoubleAnimation doubleAnimation2 = doubleAnimation1;
DoubleAnimation doubleAnimation3 = new DoubleAnimation();
doubleAnimation3.To = new double?(verticalOffset);
doubleAnimation3.Duration = duration;
DoubleAnimation doubleAnimation4 = doubleAnimation3;
Storyboard.SetTarget((DependencyObject)doubleAnimation2, (DependencyObject)viewer);
Storyboard.SetTarget((DependencyObject)doubleAnimation4, (DependencyObject)viewer);
Storyboard.SetTargetProperty((DependencyObject)doubleAnimation4, new PropertyPath((object)ScrollViewerExtensions.HorizontalOffsetProperty));
Storyboard.SetTargetProperty((DependencyObject)doubleAnimation2, new PropertyPath((object)ScrollViewerExtensions.VerticalOffsetProperty));
storyboard.Children.Add((Timeline)doubleAnimation2);
storyboard.Children.Add((Timeline)doubleAnimation4);
storyboard.Begin();
}
}
private static void ScrollByHorizontalOffset(ScrollViewer viewer, double offset)
{
offset += viewer.HorizontalOffset;
offset = ScrollViewerExtensions.CoerceHorizontalOffset(viewer, offset);
viewer.ScrollToHorizontalOffset(offset);
}
private static void ScrollByVerticalOffset(ScrollViewer viewer, double offset)
{
offset += viewer.VerticalOffset;
offset = ScrollViewerExtensions.CoerceVerticalOffset(viewer, offset);
viewer.ScrollToVerticalOffset(offset);
}