private int InsertOntoView(AViews.View view, DragItem item)
{
var positionEntered = GetListPositionForView(view);
var correctedPosition = positionEntered;
// If the view already has a translation, we need to adjust the position
// If the view has a positive translation, that means that the current position
// is actually one index down then where it started.
// If the view has a negative translation, that means it actually moved
// up previous now we will need to move it down.
if (view.TranslationY > 0)
{
correctedPosition += 1;
}
else if (view.TranslationY < 0)
{
correctedPosition -= 1;
}
// If the current index of the dragging item is bigger than the target
// That means the dragging item is moving up, and the target view should
// move down, and vice-versa
var translationCoef = item.Index > correctedPosition ? 1 : -1;
// We translate the item as much as the height of the drag item (up or down)
var translationTarget = view.TranslationY + (translationCoef * item.View.Height);
ObjectAnimator anim = ObjectAnimator.OfFloat(view, "TranslationY", view.TranslationY, translationTarget);
anim.SetDuration(100);
anim.Start();
return(correctedPosition);
}
/// <summary>
/// Handler for Long Click event from <paramref name="view"/>
/// </summary>
/// <param name="parent">
/// The parent list view .
/// </param>
/// <param name="view">
/// The view that triggered the long click event
/// </param>
/// <param name="position">
/// The position of the view in the list (has to be normalized, includes headers).
/// </param>
/// <param name="id">
/// The id of the item that triggered the event (must be bigger than 0 under normal circumstances).
/// </param>
/// <returns>
/// The <see cref="bool"/> flag that identifies whether the event is handled.
/// </returns>
public bool OnItemLongClick(AWidget.AdapterView parent, AViews.View view, int position, long id)
{
var selectedItem = ((IList)_element.ItemsSource)[(int)id];
DragItem dragItem = new DragItem(NormalizeListPosition(position), view, selectedItem);
var data = ClipData.NewPlainText(string.Empty, string.Empty);
AViews.View.DragShadowBuilder shadowBuilder = new AViews.View.DragShadowBuilder(view);
view.Visibility = ViewStates.Invisible;
if (Build.VERSION.SdkInt >= BuildVersionCodes.N)
{
view.StartDragAndDrop(data, shadowBuilder, dragItem, 0);
}
else
{
view.StartDrag(data, shadowBuilder, id, 0);
}
return(true);
}