private void OnSnapAnimationCompleted()
{
currentInteractionStatus = InteractionStatus.None;
isSnapAnimationCompleted = true;
AssociatedObject.ScrollPosition = SnapAnimationHelper.FinalValue;
this.ScrollCompleted.ExecuteCommand();
}
public Task SetStatusForInteractions(IEnumerable <string> interactionIds, InteractionStatus status, string statusDescription)
{
return(UpdateInteractionStatusesAsync(interactionIds.Select(x => new UpdateInteractionStatus
{
Id = x,
Status = status,
StatusDescription = statusDescription
})));
}
private void BeginInteraction(Point initialPoint)
{
CurrentForce = 0.0;
currentInteractionStatus = InteractionStatus.Interacting;
if (AssociatedObject == null)
{
return;
}
InitialTime = DateTime.Now;
InitialPosition = initialPoint;
PreviousPosition = InitialPosition;
InitialOffset = AssociatedObject.ScrollPosition;
this.ScrollStarted.ExecuteCommand();
}
/// <summary>
/// Установить статус для взаимодействий
/// </summary>
/// <param name="ids"></param>
/// <param name="status"></param>
/// <param name="statusDescription"></param>
/// <returns></returns>
public Task SetStatusForInteractions(IEnumerable <string> ids, InteractionStatus status, string statusDescription)
{
var now = Application.DateTimeProvider.Now;
var list = ids.Select(x => new InteractionStatusLog
{
Id = Guid.NewGuid().ToString(),
Status = status,
StartedOn = now,
InteractionId = x,
StatusDescription = statusDescription
});
GetRepository <InteractionStatusLog>().CreateHandled(list);
return(SaveChangesAsync());
}
private void FinishInteraction(Point releasePoint)
{
if (currentInteractionStatus != InteractionStatus.Interacting)
{
return;
}
var delta = releasePoint - PreviousPosition;
if (delta.Length <= InertiaTriggerArea)
{
this.ScrollCompleted.ExecuteCommand();
currentInteractionStatus = InteractionStatus.Scrolling;
return;
}
CalculateForce();
currentInteractionStatus = InteractionStatus.Scrolling;
}
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 void CompositionTarget_Rendering(object sender, EventArgs e)
{
if (AssociatedObject == null || !AssociatedObject.IsVisible)
{
return;
}
if (currentInteractionStatus == InteractionStatus.PreEngaged)
{
PreEngagementAnimationHelper.Update();
}
if (currentInteractionStatus != InteractionStatus.Scrolling)
{
return;
}
UpdateSnapAnimation();
if (CurrentForce <= 0 && (Convert.ToInt32(AssociatedObject.ScrollPosition % MaximumDegreeReturnSnap) == 0) && isSnapAnimationCompleted)
{
currentInteractionStatus = InteractionStatus.None;
return;
}
var currentTime = DateTime.Now;
var elapsedTime = currentTime - LastUpdate;
CurrentVelocity = CurrentForce / BodyMass;
var dueDisplacement = CurrentVelocity * (Double)elapsedTime.TotalMilliseconds;
if (CurrentForceDirection == ForceDirection.Down)
{
dueDisplacement *= -1;
}
var newOffset = AssociatedObject.ScrollPosition + dueDisplacement;
if (Double.IsNaN(newOffset))
{
return;
}
AssociatedObject.ScrollPosition = newOffset;
CurrentForce = Math.Max(0, CurrentForce - ((Double)elapsedTime.TotalMilliseconds * CurrentForce * Friction));
if (CurrentForce < 0.0001)
{
CurrentForce = 0;
}
if (!isSnapAnimationCompleted)
{
return;
}
if (CurrentVelocity <= SnapVelocity)
{
var roundedOffset = Math.Round(newOffset, 0);
var goalOffset = GetSnapOffset(roundedOffset);
CurrentForce = 0;
StartSnapAnimation(AssociatedObject.ScrollPosition, goalOffset);
}
LastUpdate = DateTime.Now;
}
private void OnPreEngagementAnimationCompleted()
{
preEngagedItem.ScrollPosition = PreEngagementAnimationHelper.FinalValue;
currentInteractionStatus = InteractionStatus.Engaged;
}