public static void Animate <T> (this Animatable self, string name, Func <float, T> transform, Action <T> callback, uint rate = 16, uint length = 250,
Func <float, float> easing = null, Action <T, bool> finished = null, Func <bool> repeat = null)
{
if (transform == null)
{
throw new ArgumentNullException("transform");
}
if (callback == null)
{
throw new ArgumentNullException("callback");
}
if (self == null)
{
throw new ArgumentNullException("widget");
}
self.AbortAnimation(name);
name += self.GetHashCode().ToString();
Action <float> step = f => callback(transform(f));
Action <float, bool> final = null;
if (finished != null)
{
final = (f, b) => finished(transform(f), b);
}
var info = new Info {
Rate = rate,
Length = length,
Easing = easing ?? Easing.Linear
};
Tweener tweener = new Tweener(info.Length, info.Rate);
tweener.Easing = info.Easing;
tweener.Handle = name;
tweener.ValueUpdated += HandleTweenerUpdated;
tweener.Finished += HandleTweenerFinished;
info.tweener = tweener;
info.callback = step;
info.finished = final;
info.repeat = repeat ?? (() => false);
info.Owner = self;
animations[name] = info;
tweener.Start();
info.callback(0.0f);
}
public static bool AbortAnimation(this Animatable self, string handle)
{
handle += self.GetHashCode().ToString();
if (!animations.ContainsKey(handle))
{
return(false);
}
Info info = animations[handle];
info.tweener.ValueUpdated -= HandleTweenerUpdated;
info.tweener.Finished -= HandleTweenerFinished;
info.tweener.Stop();
animations.Remove(handle);
if (info.finished != null)
{
info.finished(1.0f, true);
}
return(true);
}
public static void AnimateKinetic(this Animatable self, string name, Func <double, double, bool> callback, double velocity, double drag, Action finished = null)
{
self.AbortAnimation(name);
name += self.GetHashCode().ToString();
System.Diagnostics.Stopwatch sw = new Stopwatch();
sw.Start();
double sign = velocity / Math.Abs(velocity);
velocity = Math.Abs(velocity);
var tick = Ticker.Default.Insert(() => {
var ms = sw.ElapsedMilliseconds;
sw.Stop();
sw.Reset();
sw.Start();
velocity -= drag * ms;
velocity = Math.Max(0, velocity);
bool result = false;
if (velocity > 0)
{
result = callback(sign * velocity * ms, velocity);
}
if (!result)
{
finished();
kinetics.Remove(name);
sw.Stop();
}
return(result);
});
kinetics [name] = tick;
}
public int GetHashCode(Animatable <T> obj) => obj.GetHashCode();
public static bool AnimationIsRunning(this Animatable self, string handle)
{
handle += self.GetHashCode().ToString();
return(animations.ContainsKey(handle));
}