public AnimatorStateMachine(Animation animation, Animatable control, Animator <T> animator, Action onComplete)
{
_parent = animator;
_targetAnimation = animation;
_targetControl = control;
_neutralValue = (T)_targetControl.GetValue(_parent.Property);
_delayTotalFrameCount = (ulong)(animation.Delay.Ticks / Timing.FrameTick.Ticks);
_durationTotalFrameCount = (ulong)(animation.Duration.Ticks / Timing.FrameTick.Ticks);
switch (animation.RepeatCount.RepeatType)
{
case RepeatType.Loop:
_isLooping = true;
_checkLoopAndRepeat = true;
break;
case RepeatType.Repeat:
_isRepeating = true;
_checkLoopAndRepeat = true;
_repeatCount = animation.RepeatCount.Value;
break;
}
_isReversed = (animation.PlaybackDirection & PlaybackDirection.Reverse) != 0;
_animationDirection = _targetAnimation.PlaybackDirection;
_fillMode = _targetAnimation.FillMode;
if (_durationTotalFrameCount > 0)
{
_currentState = KeyFramesStates.DoDelay;
}
else
{
_currentState = KeyFramesStates.DoRun;
}
_onComplete = onComplete;
}
public void Dispose()
{
_unsubscribe = true;
_currentState = KeyFramesStates.Disposed;
}
private void InternalStep(PlayState _playState, Func <double, T, T> Interpolator)
{
if (!_gotFirstKFValue)
{
_firstKFValue = _parent.First().Value;
_gotFirstKFValue = true;
}
if (_currentState == KeyFramesStates.Disposed)
{
throw new InvalidProgramException("This KeyFrames Animation is already disposed.");
}
if (_playState == PlayState.Stop)
{
_currentState = KeyFramesStates.Stop;
}
// Save state and pause the machine
if (_playState == PlayState.Pause && _currentState != KeyFramesStates.Pause)
{
_savedState = _currentState;
_currentState = KeyFramesStates.Pause;
}
// Resume the previous state
if (_playState != PlayState.Pause && _currentState == KeyFramesStates.Pause)
{
_currentState = _savedState;
}
double _tempDuration = 0d, _easedTime;
bool handled = false;
while (!handled)
{
switch (_currentState)
{
case KeyFramesStates.DoDelay:
if (_fillMode == FillMode.Backward ||
_fillMode == FillMode.Both)
{
if (_currentIteration == 0)
{
_targetObserver.OnNext(_firstKFValue);
}
else
{
_targetObserver.OnNext(_lastInterpValue);
}
}
if (_delayFrameCount > _delayTotalFrameCount)
{
_currentState = KeyFramesStates.DoRun;
}
else
{
handled = true;
_delayFrameCount++;
}
break;
case KeyFramesStates.DoRun:
if (_isReversed)
{
_currentState = KeyFramesStates.RunBackwards;
}
else
{
_currentState = KeyFramesStates.RunForwards;
}
break;
case KeyFramesStates.RunForwards:
if (_durationFrameCount > _durationTotalFrameCount)
{
_currentState = KeyFramesStates.RunComplete;
}
else
{
_tempDuration = (double)_durationFrameCount / _durationTotalFrameCount;
_currentState = KeyFramesStates.RunApplyValue;
}
break;
case KeyFramesStates.RunBackwards:
if (_durationFrameCount > _durationTotalFrameCount)
{
_currentState = KeyFramesStates.RunComplete;
}
else
{
_tempDuration = (double)(_durationTotalFrameCount - _durationFrameCount) / _durationTotalFrameCount;
_currentState = KeyFramesStates.RunApplyValue;
}
break;
case KeyFramesStates.RunApplyValue:
_easedTime = _targetAnimation.Easing.Ease(_tempDuration);
_durationFrameCount++;
_lastInterpValue = Interpolator(_easedTime, _neutralValue);
_targetObserver.OnNext(_lastInterpValue);
_currentState = KeyFramesStates.DoRun;
handled = true;
break;
case KeyFramesStates.RunComplete:
if (_checkLoopAndRepeat)
{
_delayFrameCount = 0;
_durationFrameCount = 0;
if (_isLooping)
{
_currentState = KeyFramesStates.DoRun;
}
else if (_isRepeating)
{
if (_currentIteration >= _repeatCount)
{
_currentState = KeyFramesStates.Stop;
}
else
{
_currentState = KeyFramesStates.DoRun;
}
_currentIteration++;
}
if (_animationDirection == PlaybackDirection.Alternate ||
_animationDirection == PlaybackDirection.AlternateReverse)
{
_isReversed = !_isReversed;
}
break;
}
_currentState = KeyFramesStates.Stop;
break;
case KeyFramesStates.Stop:
if (_fillMode == FillMode.Forward ||
_fillMode == FillMode.Both)
{
_targetControl.SetValue(_parent.Property, _lastInterpValue, BindingPriority.LocalValue);
}
_targetObserver.OnCompleted();
handled = true;
break;
default:
handled = true;
break;
}
}
}