public async Task Swipe(SwipeDirection direction, uint animationLength = DefaultAnimationLength)
{
if (_itemIndex >= ItemsSource?.Count)
{
NoMoreCards?.Invoke(this, new EventArgs());
return;
}
var topCard = CardStack.Children[NumberOfCards - 1];
var backCard = CardStack.Children[NumberOfCards - 2];
Swiped?.Invoke(this, new SwipedEventArgs(ItemsSource[_itemIndex], direction));
if (direction == SwipeDirection.Left)
{
if (SwipedLeftCommand != null && SwipedLeftCommand.CanExecute(ItemsSource[_itemIndex]))
{
SwipedLeftCommand.Execute(ItemsSource[_itemIndex]);
}
}
else if (direction == SwipeDirection.Right)
{
if (SwipedRightCommand != null && SwipedRightCommand.CanExecute(ItemsSource[_itemIndex]))
{
SwipedRightCommand.Execute(ItemsSource[_itemIndex]);
}
}
_itemIndex++;
await Task.WhenAll(
topCard.TranslateTo(direction == SwipeDirection.Right ? Width * 2 : -Width * 2, 0, animationLength, Easing.SinIn),
topCard.RotateTo(direction == SwipeDirection.Right ? 17.18873385f : -17.18873385f, animationLength, Easing.SinIn),
backCard.ScaleTo(1.0f, animationLength),
backCard.TranslateTo(0, 0, animationLength, Easing.SinIn),
backCard.FadeTo(1, animationLength, Easing.SinIn)
);
topCard.IsVisible = false;
ShowNextCard();
}
public async Task HandleTouchCompleted()
{
if (_itemIndex >= ItemsSource.Count - 1)
{
NoMoreCards?.Invoke(this, new EventArgs());
}
if (_itemIndex >= ItemsSource.Count || !_isDragging)
{
return;
}
_lastX = 0;
_isDragging = false;
var topCard = CardStack.Children[NumberOfCards - 1];
var backCard = CardStack.Children[NumberOfCards - 2];
if (Math.Abs(_cardDistance) >= CardMoveDistance)
{
await topCard.TranslateTo(_cardDistance > 0?Width * 2 : -Width * 2, 0, DefaultAnimationLength, Easing.SinIn);
topCard.IsVisible = false;
if (_cardDistance > 0)
{
Swiped?.Invoke(this, new SwipedEventArgs(ItemsSource[_itemIndex], SwipeDirection.Right));
if (SwipedRightCommand != null && SwipedRightCommand.CanExecute(ItemsSource[_itemIndex]))
{
SwipedRightCommand.Execute(ItemsSource[_itemIndex]);
}
}
else
{
Swiped?.Invoke(this, new SwipedEventArgs(ItemsSource[_itemIndex], SwipeDirection.Left));
if (SwipedLeftCommand != null && SwipedLeftCommand.CanExecute(ItemsSource[_itemIndex]))
{
SwipedLeftCommand.Execute(ItemsSource[_itemIndex]);
}
}
_itemIndex++;
ShowNextCard();
}
else
{
await Task.WhenAll(
topCard.TranslateTo((-topCard.X), -topCard.Y, DefaultAnimationLength, Easing.SpringOut),
topCard.RotateTo(0, DefaultAnimationLength, Easing.SpringOut),
backCard.ScaleTo(_defaultSubcardScale, DefaultAnimationLength, Easing.SpringOut),
backCard.TranslateTo(_defaultSubcardTranslationX, 0, DefaultAnimationLength, Easing.SpringOut),
backCard.FadeTo(_defaultSubcardOpacity, DefaultAnimationLength, Easing.SpringOut)
);
}
_cardDistance = 0;
if (_itemIndex < ItemsSource.Count)
{
FinishedDragging?.Invoke(this, new DraggingEventArgs(ItemsSource[_itemIndex], _cardDistance));
}
}