public void CancelAnimation()
{
lock (_locker)
{
if (State != EAnimatorState.Running)
{
throw new InvalidOperationException($"Cannot cancel animation because it {State}");
}
State = EAnimatorState.Suspended;
_cancellationTokenSource.Cancel();
}
}
public CPointAnimator(T animatable, CPoint from, CPoint to, TimeSpan totalDuration)
{
if (totalDuration <= TimeSpan.Zero)
{
throw new ArgumentException("Total duration value should be more than zero");
}
Animatable = animatable;
From = from;
To = to;
TotalDuration = totalDuration;
State = EAnimatorState.Unstarted;
}
public void BeginAnimation()
{
lock (_locker)
{
if (State != EAnimatorState.Unstarted && State != EAnimatorState.Suspended)
{
throw new InvalidOperationException($"Cannot begin animation because it {State}");
}
_startTime = DateTime.UtcNow;
_vector = new CVector(From, To);
_cancellationTokenSource = new CancellationTokenSource();
CancellationToken token = _cancellationTokenSource.Token;
_currentTask = new Task(() => DoAnimation(token), token);
_currentTask.Start();
State = EAnimatorState.Running;
}
}
private void DoAnimation(CancellationToken token)
{
TimeSpan durationFromStart;
while ((durationFromStart = (DateTime.UtcNow - _startTime).Duration()) < TotalDuration)
{
if (token.IsCancellationRequested)
{
return;
}
Double completedPart = durationFromStart.TotalMilliseconds / TotalDuration.TotalMilliseconds;
Animatable.SetAnimationValue(From.MovePoint(completedPart * _vector));
token.WaitHandle.WaitOne(5);
}
Animatable.SetAnimationValue(To);
if (!token.IsCancellationRequested)
{
new Task(() => AnimationCompleted?.Invoke()).Start();
}
State = EAnimatorState.Stopped;
}
