private async void Card_OnPointerPressed(object sender, PointerRoutedEventArgs e)
{
if (_maxSelected == 0)
{
return;
}
if (!Selectable)
{
return;
}
DragList dragList = new DragList();
try
{
HitTestClass hitTestProgress = new HitTestClass(_dropTarget);
Point pt = await DragAsync(this, (CardView)sender, e, dragList, hitTestProgress);
if (dragList.Count == 0)
{
return; // probably double tapped it
}
if (_dropTarget.HitTest(pt))
{
bool accepted = await _iDropTarget.DroppedCards(pt, dragList);
if (accepted)
{
this.ResetSelectedCards();
}
}
else
{
// await this.UpdateCardLayout();
AsycUpdateCardLayout asyncUppdateCardLayout = new AsycUpdateCardLayout(this);
asyncUppdateCardLayout.AsyncUpdate();
}
}
finally
{
dragList.Clear();
}
}
public Task <Point> DragAsync(CardContainer container, CardView card, PointerRoutedEventArgs origE, DragList dragList, IDragAndDropProgress progress = null)
{
TaskCompletionSource <Point> taskCompletionSource = new TaskCompletionSource <Point>();
UIElement mousePositionWindow = Window.Current.Content;
Point pointMouseDown = origE.GetCurrentPoint(mousePositionWindow).Position;
card.PushCard(true);
bool dragging = false;
if (dragList.Contains(card) == false)
{
dragList.Insert(0, card); // card you clicked is always the first one
}
PointerEventHandler pointerMovedHandler = null;
PointerEventHandler pointerReleasedHandler = null;
pointerMovedHandler = (Object s, PointerRoutedEventArgs e) =>
{
Point pt = e.GetCurrentPoint(mousePositionWindow).Position;
Point delta = new Point();
delta.X = pt.X - pointMouseDown.X;
delta.Y = pt.Y - pointMouseDown.Y;
CardView localCard = (CardView)s;
bool reorderCards = false;
//
// fixup our lists
foreach (var c in this.SelectedCards)
{
if (dragList.Contains(c) == false)
{
dragList.Add(c);
}
}
if (dragList.Contains(localCard) == false)
{
dragList.Add(localCard);
}
if (dragList.Count > _maxSelected)
{
CardView c = this.FirstSelectedCard;
c.Selected = false;
dragList.Remove(c);
c.UpdateLayout();
}
if (Math.Abs(delta.X - MOUSE_MOVE_SENSITIVITY) > 0 || Math.Abs(delta.Y - MOUSE_MOVE_SENSITIVITY) > 0)
{
dragging = true;
}
//
// check to see if we have moved out of the container in the Y direction
if (container.HitTest(pt))
{
reorderCards = true;
}
if (dragList.Count > 1)
{
reorderCards = false;
CardView otherCard = dragList[0];
double cardWidth = card.CardWidth;
if (card.Index == otherCard.Index)
{
otherCard = dragList[1];
}
//
// this moves the card to make space for reordering
int left = (int)(card.AnimationPosition.X - otherCard.AnimationPosition.X);
if (left > cardWidth)
{
otherCard.AnimateToReletiveAsync(new Point(left - cardWidth, 0), 0);
return;
}
else if (left < -card.CardWidth)
{
otherCard.AnimateToReletiveAsync(new Point(left + cardWidth, 0), 0);
return;
}
}
if (progress != null)
{
progress.Report(pt);
}
foreach (CardView c in dragList)
{
c.AnimateToReletiveAsync(delta);
}
if (reorderCards)
{
int indexOfDraggedCard = container.Items.IndexOf(card);
if (delta.X > 0)
{
if (indexOfDraggedCard < container.Items.Count - 1)
{
CardView cardToMove = container.Items[indexOfDraggedCard + 1];
if (card.AnimationPosition.X + card.CardWidth * 0.5 > cardToMove.AnimationPosition.X)
{
cardToMove.AnimateToReletiveAsync(new Point(-card.CardWidth, 0), MainPage.AnimationSpeeds.VeryFast);
container.Items.Remove(card);
container.Items.Insert(container.Items.IndexOf(cardToMove) + 1, card);
}
}
}
else //moving left
{
if (indexOfDraggedCard > 0)
{
CardView cardToMove = container.Items[indexOfDraggedCard - 1];
if (card.AnimationPosition.X - card.CardWidth * 0.5 < cardToMove.AnimationPosition.X)
{
cardToMove.AnimateToReletiveAsync(new Point(card.CardWidth, 0), MainPage.AnimationSpeeds.VeryFast);
container.Items.Remove(card);
container.Items.Insert(container.Items.IndexOf(cardToMove), card);
}
}
}
}
pointMouseDown = pt;
};
pointerReleasedHandler = (Object s, PointerRoutedEventArgs e) =>
{
CardView localCard = (CardView)s;
localCard.PointerMoved -= pointerMovedHandler;
localCard.PointerReleased -= pointerReleasedHandler;
localCard.ReleasePointerCapture(origE.Pointer);
localCard.PushCard(false);
if (!dragging)
{
ToggleSelectCard(card);
dragList.Clear();
}
Point exitPoint = e.GetCurrentPoint(mousePositionWindow).Position;
if (progress != null)
{
progress.PointerUp(exitPoint);
}
//if (container.HitTest(exitPoint) == true) // you landed where you started
// container.UpdateCardLayoutAsync(500, false);
//
// returns the point that the mouse was released. the _selectedCards list
// will have the cards that were selected. if dragging occurred, the card(s)
// will be in the _draggingList
taskCompletionSource.SetResult(exitPoint);
};
card.CapturePointer(origE.Pointer);
card.PointerMoved += pointerMovedHandler;
card.PointerReleased += pointerReleasedHandler;
return(taskCompletionSource.Task);
}