public static void SynchronizeScroll(this ScrollViewer target, ScrollViewer source, ScrollSyncOption option, bool proportional = true)
{
if (source == null)
throw new ArgumentNullException("source");
if (target == null)
throw new ArgumentNullException("target");
double newScrollOffset;
switch (option) {
case ScrollSyncOption.Vertical:
if (proportional)
newScrollOffset = source.VerticalOffset / source.ScrollableHeight * target.ScrollableHeight;
else
newScrollOffset = source.VerticalOffset;
target.ScrollToVerticalOffset(double.IsNaN(newScrollOffset) ? 0 : newScrollOffset);
break;
case ScrollSyncOption.Horizontal:
if (proportional)
newScrollOffset = source.HorizontalOffset / source.ScrollableWidth * target.ScrollableWidth;
else
newScrollOffset = source.HorizontalOffset;
target.ScrollToHorizontalOffset(double.IsNaN(newScrollOffset) ? 0 : newScrollOffset);
break;
case ScrollSyncOption.VerticalToHorizontal:
if (proportional)
newScrollOffset = source.VerticalOffset / source.ScrollableHeight * target.ScrollableWidth;
else
newScrollOffset = source.VerticalOffset;
target.ScrollToHorizontalOffset(double.IsNaN(newScrollOffset) ? 0 : newScrollOffset);
break;
case ScrollSyncOption.HorizontalToVertical:
if (proportional)
newScrollOffset = source.HorizontalOffset / source.ScrollableWidth * target.ScrollableHeight;
else
newScrollOffset = source.HorizontalOffset;
target.ScrollToVerticalOffset(double.IsNaN(newScrollOffset) ? 0 : newScrollOffset);
break;
case ScrollSyncOption.Both:
if (proportional)
newScrollOffset = source.VerticalOffset / source.ScrollableHeight * target.ScrollableHeight;
else
newScrollOffset = source.VerticalOffset;
target.ScrollToVerticalOffset(double.IsNaN(newScrollOffset) ? 0 : newScrollOffset);
if (proportional)
newScrollOffset = source.HorizontalOffset / source.ScrollableWidth * target.ScrollableWidth;
else
newScrollOffset = source.HorizontalOffset;
target.ScrollToHorizontalOffset(double.IsNaN(newScrollOffset) ? 0 : newScrollOffset);
break;
case ScrollSyncOption.BothInterchanged:
if (proportional)
newScrollOffset = source.VerticalOffset / source.ScrollableHeight * target.ScrollableWidth;
else
newScrollOffset = source.VerticalOffset;
target.ScrollToHorizontalOffset(double.IsNaN(newScrollOffset) ? 0 : newScrollOffset);
if (proportional)
newScrollOffset = source.HorizontalOffset / source.ScrollableWidth * target.ScrollableHeight;
else
newScrollOffset = source.HorizontalOffset;
target.ScrollToVerticalOffset(double.IsNaN(newScrollOffset) ? 0 : newScrollOffset);
break;
default:
throw new Exception("Invalid value for ScrollSyncOption");
}
}
public static void SynchronizeScroll(this ScrollViewer target, ScrollViewer source, ScrollSyncOption option, bool proportional = true)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
if (target == null)
{
throw new ArgumentNullException("target");
}
double newScrollOffset;
switch (option)
{
case ScrollSyncOption.Vertical:
if (proportional)
{
newScrollOffset = source.VerticalOffset / source.ScrollableHeight * target.ScrollableHeight;
}
else
{
newScrollOffset = source.VerticalOffset;
}
target.ScrollToVerticalOffset(double.IsNaN(newScrollOffset) ? 0 : newScrollOffset);
break;
case ScrollSyncOption.Horizontal:
if (proportional)
{
newScrollOffset = source.HorizontalOffset / source.ScrollableWidth * target.ScrollableWidth;
}
else
{
newScrollOffset = source.HorizontalOffset;
}
target.ScrollToHorizontalOffset(double.IsNaN(newScrollOffset) ? 0 : newScrollOffset);
break;
case ScrollSyncOption.VerticalToHorizontal:
if (proportional)
{
newScrollOffset = source.VerticalOffset / source.ScrollableHeight * target.ScrollableWidth;
}
else
{
newScrollOffset = source.VerticalOffset;
}
target.ScrollToHorizontalOffset(double.IsNaN(newScrollOffset) ? 0 : newScrollOffset);
break;
case ScrollSyncOption.HorizontalToVertical:
if (proportional)
{
newScrollOffset = source.HorizontalOffset / source.ScrollableWidth * target.ScrollableHeight;
}
else
{
newScrollOffset = source.HorizontalOffset;
}
target.ScrollToVerticalOffset(double.IsNaN(newScrollOffset) ? 0 : newScrollOffset);
break;
case ScrollSyncOption.Both:
if (proportional)
{
newScrollOffset = source.VerticalOffset / source.ScrollableHeight * target.ScrollableHeight;
}
else
{
newScrollOffset = source.VerticalOffset;
}
target.ScrollToVerticalOffset(double.IsNaN(newScrollOffset) ? 0 : newScrollOffset);
if (proportional)
{
newScrollOffset = source.HorizontalOffset / source.ScrollableWidth * target.ScrollableWidth;
}
else
{
newScrollOffset = source.HorizontalOffset;
}
target.ScrollToHorizontalOffset(double.IsNaN(newScrollOffset) ? 0 : newScrollOffset);
break;
case ScrollSyncOption.BothInterchanged:
if (proportional)
{
newScrollOffset = source.VerticalOffset / source.ScrollableHeight * target.ScrollableWidth;
}
else
{
newScrollOffset = source.VerticalOffset;
}
target.ScrollToHorizontalOffset(double.IsNaN(newScrollOffset) ? 0 : newScrollOffset);
if (proportional)
{
newScrollOffset = source.HorizontalOffset / source.ScrollableWidth * target.ScrollableHeight;
}
else
{
newScrollOffset = source.HorizontalOffset;
}
target.ScrollToVerticalOffset(double.IsNaN(newScrollOffset) ? 0 : newScrollOffset);
break;
default:
throw new Exception("Invalid value for ScrollSyncOption");
}
}
