private void Engage(Point point, EngagementArea engagementArea)
{
CurrentForce = 0.0;
currentInteractionStatus = InteractionStatus.Engaged;
if (AssociatedObject == null)
{
return;
}
InitialTime = DateTime.Now;
InitialPosition = point;
PreviousPosition = InitialPosition;
InitialOffset = AssociatedObject.ScrollPosition;
this.engagementArea = engagementArea;
//var preEngagedItem = GetPreEngagementCarouselItem(point, engagementArea);
//this.preEngagedItem = preEngagedItem;
//var direction = engagementArea == EngagementArea.Left ? 1 : -1;
//var finalValue = preEngagedItem.ScrollPosition + PreEngagementScrollPositionDelta * direction;
//PreEngagementAnimationHelper.StartAnimation(preEngagedItem.ScrollPosition, finalValue);
}
private CarouselItem GetPreEngagementCarouselItem(Point point, EngagementArea engagementArea)
{
var direction = engagementArea == EngagementArea.Left ? -1 : 1;
var items = this.AssociatedObject.FindVisualChild <Canvas>().Children;
//System.Diagnostics.Debug.WriteLine("PRE ENGAGEMENT Scroll Position = " + AssociatedObject.ScrollPosition + " Engagement " + engagementArea);
//foreach (CarouselItem item in items)
//{
// System.Diagnostics.Debug.WriteLine(String.Format("{0} - {1}", item.DataContext, item.ScrollPosition));
//}
var nextItem = (from CarouselItem item in items
where Math.Abs((SelectedItemScrollPosition + AssociatedObject.ItemSeparation * direction) - item.ScrollPosition) < 0.001
select item).ToArray().FirstOrDefault();
if (nextItem == null)
{
switch (engagementArea)
{
case EngagementArea.Left:
{
nextItem = (from CarouselItem item in items
orderby item.ScrollPosition descending
select item).ToArray().FirstOrDefault();
}
break;
case EngagementArea.Right:
{
nextItem = (from CarouselItem item in items
orderby item.ScrollPosition ascending
select item).ToArray().FirstOrDefault();
}
break;
default:
break;
}
}
return(nextItem);
}
