private void ExecuteAlphaAnimation(int from, int to, int duration)
{
CheckAttrsValues();
ValueAnimator valueAnimator = ValueAnimator.OfInt(from, to);
valueAnimator.SetDuration(duration);
valueAnimator.AddUpdateListener(new AnonymousAnimatorUpdateListener(animation => {
int newAlpha = (int)animation.AnimatedValue;
this.ForgroundAlpha = newAlpha;
//anim finished
if (newAlpha == to)
{
valueAnimator.Cancel();
this.animList.Clear();
if (this.onAlphaFinishedListener != null)
{
if (from > to)
{
this.onAlphaFinishedListener.OnHideFinished();
}
else
{
this.onAlphaFinishedListener.OnShowFinished();
}
}
}
}));
valueAnimator.Start();
animList.Add(valueAnimator);
}
/// <summary>
/// get alpha when animation finished or intercepted
/// @return
/// </summary>
private int GetLastFinishedAlpha(bool isShow)
{
if (animList.Count == 0)
{
return(isShow ? alphaFrom : alphaTo);
}
else
{
ValueAnimator animator = animList[animList.Count - 1];
animator.Cancel();
int alpha = (int)animator.AnimatedValue;
animList.Clear();
return(alpha);
}
}
