private void ScrollToVerticalOffset(double delta, bool isAnimationEnabled)
{
var scrollViewer = this.GetScrollViewer();
if (scrollViewer == null)
{
return;
}
var time = this.AnimationTime;
if (time <= 0 || !isAnimationEnabled)
{
// no animation
scrollViewer.ScrollToVerticalOffset(scrollViewer.VerticalOffset + delta);
return;
}
var animation = new DoubleAnimation()
{
From = 0,
To = delta,
EasingFunction = new PowerEase()
{
EasingMode = EasingMode.EaseInOut, Power = 1.2
},
Duration = new Duration(TimeSpan.FromMilliseconds(time)),
};
var target = new SingleValueAnimator <double>();
var id = this.idCount++;
target.ValueChanged += (o, e) => this.Animated(scrollViewer, id, target, e);
//var startTime = DateTime.Now.Ticks;
animation.Completed += (o, e) =>
{
//Debug.WriteLine(DateTime.Now.Ticks - startTime);
this.animatingObjects.Remove(id);
};
//Debug.WriteLine($"{DateTime.Now.Ticks}, {this.animatingObjects.Count}");
target.BeginAnimation(SingleValueAnimator <double> .ValueProperty, animation);
}
/// <summary>
/// アニメーション中
/// </summary>
/// <param name="scrollViewer"></param>
/// <param name="id"></param>
/// <param name="e"></param>
private void Animated
(ScrollViewer scrollViewer, int id, SingleValueAnimator <double> target,
DependencyPropertyChangedEventArgs e)
{
this.request.Enqueue(new ScrollRequestContainer()
{
OldValue = (double)e.OldValue,
NewValue = (double)e.NewValue,
Id = id,
});
this.animatingObjects[id] = target;
//リクエストが溜まっていない間はスクロールしない
if (request.Count < this.animatingObjects.Count)
{
//Debug.WriteLine($"request:{request.Count},animating:{this.animatingObjects.Count}");
return;
}
var items = this.request.ToArray();
this.request.Clear();
var oldValue = 0.0;
var newValue = 0.0;
foreach (var item in items)
{
oldValue += item.OldValue;
newValue += item.NewValue;
}
//var oldValue = items.Sum(x => x.OldValue);
//var newValue = items.Sum(x => x.NewValue);
var ids = items.Select(x => x.Id).Distinct().ToArray();
if (this.prevActedIds != null)
{
//動いていないアニメーションが検出された
var actedIds = this.prevActedIds.Concat(ids).Distinct().ToArray();
this.animatingObjects
.Where(x => !actedIds.Contains(x.Key))
.ToArray()
.ForEach(x =>
{
this.animatingObjects.Remove(x.Key);
Debug.WriteLine($"aborted animation is detected:{x.Key}");
});
this.prevActedIds = null;
}
else
{
if (ids.Length != items.Length)
{
//Id被り=動いていないアニメーションがある
this.prevActedIds = ids;
Debug.WriteLine("animation id is repeated");
}
else
{
this.prevActedIds = null;
}
}
var b = scrollViewer.VerticalOffset - oldValue;
scrollViewer.ScrollToVerticalOffset(b + newValue);
//Debug.WriteLine($"{DateTime.Now.Ticks}, {newValue - oldValue}, {items.Length}");
}