private void OpenFABAnimation()
{
const int animationDuration = 100;
const int animationFadeDuration = 500;
_isOpening = true;
if (ItemsLayout != null)
{
for (int index = 0; index < ItemsLayout.ViewItems.Count; index++)
{
var currentItem = ItemsLayout.ViewItems[index];
var position = CalculateItemClosedPosition(currentItem, index);
currentItem.TranslationY = position;
currentItem.Opacity = 0;
}
ItemsLayout.IsVisible = true;
OpacityFilter.IsVisible = true;
OpacityFilter.Opacity = 0;
OpacityFilter.FadeTo(0.5, animationFadeDuration);
if (IsRotateAnimationEnabled)
{
FAB.RotateAnimation();
}
foreach (var item in ItemsLayout.ViewItems)
{
item.TranslateTo(0, 0, animationDuration, easing: Easing.BounceIn);
item.FadeTo(1, animationDuration, easing: Easing.BounceIn);
}
}
}
private async void CloseAnimationOnFab()
{
_isOpening = false;
if (IsRotateAnimationEnabled)
{
FAB.RestoreRotationAnimation();
}
if (ItemsLayout != null)
{
const int animationDuration = 250;
ItemsLayout.IsVisible = true;
var tasks = new List <Task>();
if (ItemsLayout.ViewItems != null)
{
tasks.Add(OpacityFilter.FadeTo(0, animationDuration));
for (int index = 0; index < ItemsLayout.ViewItems.Count; index++)
{
var currentItem = ItemsLayout.ViewItems[index];
var position = CalculateItemClosedPosition(currentItem, index);
tasks.Add(currentItem.TranslateTo(0, position, animationDuration, easing: Easing.BounceIn));
tasks.Add(currentItem.FadeTo(0, animationDuration, easing: Easing.BounceIn));
}
await Task.WhenAll(tasks.ToArray());
// if user didn't reopen the FAM during animation
if (_isOpening == false)
{
ItemsLayout.IsVisible = false;
OpacityFilter.IsVisible = false;
}
}
}
}
