private static Storyboard CreateStoryboard(
FrameworkElement target,
DependencyProperty animatingDependencyProperty,
string propertyPath,
ref object toValue,
TimeSpan durationTimeSpan,
IEasingFunction easingFunction)
{
object fromValue = target.GetValue(animatingDependencyProperty);
double fromDoubleValue;
double toDoubleValue;
DateTime fromDateTime;
DateTime toDateTime;
var storyBoard = new Storyboard();
Storyboard.SetTarget(storyBoard, target);
Storyboard.SetTargetProperty(storyBoard, new PropertyPath(propertyPath));
if ((fromValue != null && toValue != null))
{
if (ValueHelper.TryConvert(fromValue, out fromDoubleValue) &&
ValueHelper.TryConvert(toValue, out toDoubleValue))
{
var doubleAnimation = new DoubleAnimation();
doubleAnimation.EasingFunction = easingFunction;
doubleAnimation.Duration = durationTimeSpan;
doubleAnimation.To = ValueHelper.ToDouble(toValue);
toValue = doubleAnimation.To;
storyBoard.Children.Add(doubleAnimation);
}
else if (ValueHelper.TryConvert(fromValue, out fromDateTime) &&
ValueHelper.TryConvert(toValue, out toDateTime))
{
var keyFrameAnimation = new ObjectAnimationUsingKeyFrames();
keyFrameAnimation.Duration = durationTimeSpan;
var intervals = (long)(durationTimeSpan.TotalSeconds * KeyFramesPerSecond);
if (intervals < 2L)
{
intervals = 2L;
}
IEnumerable <TimeSpan> timeSpanIntervals =
ValueHelper.GetTimeSpanIntervalsInclusive(durationTimeSpan, intervals);
IEnumerable <DateTime> dateTimeIntervals =
ValueHelper.GetDateTimesBetweenInclusive(fromDateTime, toDateTime, intervals);
IEnumerable <DiscreteObjectKeyFrame> keyFrames =
EnumerableFunctions.Zip(
dateTimeIntervals,
timeSpanIntervals,
(dateTime, timeSpan) =>
new DiscreteObjectKeyFrame {
Value = dateTime, KeyTime = timeSpan
});
foreach (DiscreteObjectKeyFrame keyFrame in keyFrames)
{
keyFrameAnimation.KeyFrames.Add(keyFrame);
toValue = keyFrame.Value;
}
storyBoard.Children.Add(keyFrameAnimation);
}
}
if (storyBoard.Children.Count == 0)
{
var keyFrameAnimation = new ObjectAnimationUsingKeyFrames();
var endFrame = new DiscreteObjectKeyFrame {
Value = toValue, KeyTime = new TimeSpan(0, 0, 0)
};
keyFrameAnimation.KeyFrames.Add(endFrame);
storyBoard.Children.Add(keyFrameAnimation);
}
return(storyBoard);
}
