/// <summary>
/// ダウン時動作
/// </summary>
/// <param name="e"></param>
private void OnDown(PointerTapEventArgs e, UIElement target)
{
// マウスムーブをマウスダウンまでスキップ。マウスダウン時にマウスをキャプチャ
if (this.isMouseCapturing)
{
return;
}
this.StopAnimation();
//this.story?.Pause();
var position = (Vector)e.GetPosition(this.AssociatedObject);
this.startPosition = position;
this.positionHistory.Clear();
this.intervalMilliSecHistory.Clear();
this.startOffset = new Vector
(this.AssociatedObject.HorizontalOffset, this.AssociatedObject.VerticalOffset);
this.isTouch = e.IsTouch;
//this.isInartiaMoving = false;
//this.isMouseCapturing = false;
//if (e.Pointer.PointerDeviceType == PointerDeviceType.Mouse)
{
target.CaptureMouse();//.CapturePointer(e.Pointer);
this.isMouseCapturing = true;
}
}
/// <summary>
/// ダウン時動作
/// </summary>
/// <param name="e"></param>
private void OnDown(PointerTapEventArgs e, UIElement target)
{
var position = (Vector)e.GetPosition(this.AssociatedObject);
this.startPosition = position;
this.startTime = DateTime.Now;
this.moved = false;
}
/// <summary>
/// 移動中動作
/// </summary>
/// <param name="e"></param>
private void OnMove(PointerTapEventArgs e, UIElement target)
{
var point = (Vector)e.GetPosition(this.AssociatedObject);
if ((point - this.startPosition).LengthSquared > 800)
{
this.moved = true;
}
}
/// <summary>
/// 移動中動作
/// </summary>
/// <param name="e"></param>
private void OnMove(PointerTapEventArgs e, UIElement target)
{
//this.isInartiaMoving = false;
if (!this.isMouseCapturing)
{
return;
}
var point = (Vector)e.GetPosition(this.AssociatedObject);
this.positionHistory.Push(point);
this.CurrentOffset = (Point)(this.startOffset - point + this.startPosition);
}
/// <summary>
/// アップ時動作
/// </summary>
/// <param name="e"></param>
private void OnUp(PointerTapEventArgs e, UIElement target)
{
var timeSpan = DateTime.Now - this.startTime;
if (!this.moved)
{
var args = e.Clone();
args.Span = timeSpan;
args.StartPosition = this.startPosition;
args.EndPosition = (Vector)e.GetPosition(this.AssociatedObject);
args.SenderHeight = this.AssociatedObject.ActualHeight;
args.SenderWidth = this.AssociatedObject.ActualWidth;
this.TapSubject.OnNext(args);
}
}
/// <summary>
/// アップ時動作
/// </summary>
/// <param name="e"></param>
private void OnUp(PointerTapEventArgs e, UIElement target)
{
if (target?.IsMouseCaptured == true)
{
target.ReleaseMouseCapture();
}
this.StopAnimation();
if (!this.isMouseCapturing)
{
return;
}
var pc = this.positionHistory.Count;
var tc = this.intervalMilliSecHistory.Count;
if (tc < 2)
{
return;
}
var positionZ1 = this.positionHistory.Pop();
var lastPosition = positionZ1;
var prevPosition = positionZ1;
var lastIntervalMilliSec = this.intervalMilliSecHistory.Pop();
while (this.positionHistory.Count > 0 && this.intervalMilliSecHistory.Count > 0)
{
prevPosition = this.positionHistory.Pop();
if (lastPosition != prevPosition)
{
break;
}
lastIntervalMilliSec = this.intervalMilliSecHistory.Pop();
}
this.positionHistory.Clear();
this.intervalMilliSecHistory.Clear();
if (lastIntervalMilliSec <= 0)
{
return;
}
var velocity = (lastPosition - prevPosition) / lastIntervalMilliSec;
var displacement = this.startPosition - positionZ1;
var vo = velocity.Length;
if (vo > this.scrollableVelocityThreshold &&
displacement.Length > scrollableDisplacementThreshold)
{
var a = -Math.Log(vo / this.endVelocity);
var damping = this.CalcDamping(vo);
var time = Math.Min(-a / damping * vo / (vo - this.endVelocity), maxTime);
var start = this.startOffset + displacement;
var goal = start - velocity / damping;
// 慣性スクロールアニメーション開始
//var storyboard = new Storyboard();
var animation = new PointAnimation()
{
From = (Point)start,
To = new Point(Math.Round(goal.X), Math.Round(goal.Y)),// (Point)goal,
Duration = new Duration(TimeSpan.FromMilliseconds(time)),
EasingFunction = new ExponentialEase()
{
Exponent = a,
EasingMode = EasingMode.EaseIn
},
//EnableDependentAnimation = true,
};
Storyboard.SetTarget(animation, this);
Storyboard.SetTargetProperty(animation, new PropertyPath(CurrentOffsetProperty));
//new PropertyPath($"({nameof(InertiaScrollViewerBehaviour)}.{nameof(CurrentOffset)})"));
this.BeginAnimation(CurrentOffsetProperty, animation);
//storyboard.Children.Add(animation);
//this.story = storyboard;
//storyboard.Begin();
}
this.isMouseCapturing = false;
}
