/// <summary>
/// Method, executed each animation step.
/// </summary>
/// <param name="xGlobal">Current X [0;1] value.</param>
/// <param name="state">
/// Animation state object, created by <see cref="AnimationBase{TState}.StoreAnimationState" /> and
/// returned.
/// </param>
protected override void Update(double xGlobal, KeyFrameAnimationState <TAnimationValue> state)
{
var animationDuration = Duration.ToTimeSpan().TotalMilliseconds;
for (var i = 0; i < KeyFrames.Count; i++)
{
var keyFrame = KeyFrames[i];
var x1 = keyFrame.KeyTime.TotalMilliseconds / animationDuration;
if (xGlobal < x1)
{
continue;
}
if (i == 1)
{
}
var x2 = (i < KeyFrames.Count - 1
? KeyFrames[i + 1].KeyTime.TotalMilliseconds
: animationDuration) / animationDuration;
if (xGlobal > x2)
{
continue;
}
var x = (xGlobal - x1) / (x2 - x1);
state.PreviousKeyFrameValue = i > 0 ? KeyFrames[i - 1].Value : state.StoredValue;
keyFrame.Update(x, state);
}
}
/// <summary>
/// Method, executed when animation finished execution.
/// </summary>
/// <param name="target"><see cref="BindableObject" />target bindable, changed in scope of animation.</param>
/// <param name="state">
/// Animation state object, created by <see cref="AnimationBase{TState}.StoreAnimationState" /> and
/// returned.
/// </param>
protected override void RestoreAnimationState(BindableObject target,
KeyFrameAnimationState <TAnimationValue> state)
{
if (FillBehavior == FillBehavior.Stop)
{
state.Target.SetValue(TargetProperty, state.StoredValue);
}
}
///<inheritdoc cref="KeyFrame{TValue}"/>
/// <summary>
/// <see cref="AnimationState.Target"/>.<see cref="KeyFrameAnimationState{T}.TargetProperty"/> update logic.
/// </summary>
/// <param name="x">
/// [0;1] value, describes KeyFrame's owner animation position, calculated based on <see cref="IAnimation.BeginTime" />,
/// <see cref="IAnimation.Duration" /> and current animation's position.
/// </param>
/// <param name="state"><see cref="KeyFrameAnimation{TAnimationValue}"/> animation state object.</param>
public override void Update(double x, KeyFrameAnimationState <TValue> state)
{
state.Target.SetValue(state.TargetProperty, Value);
}
/// <summary>
/// Should be implemented in descendants and contains some <see cref="KeyFrameAnimationState{T}.TargetProperty" />
/// updation logic.
/// </summary>
/// <param name="x">
/// [0;1] value, describes KeyFrame's owner animation position, calculated based on <see cref="IAnimation.BeginTime" />,
/// <see cref="IAnimation.Duration" /> and current animation's position.
/// </param>
/// <param name="state"><see cref="KeyFrameAnimation{TAnimationValue}" /> animation state object.</param>
public override void Update(double x, KeyFrameAnimationState <TValue> state)
{
state.Target.SetValue(state.TargetProperty, GetInterpolatedValue(x, state.PreviousKeyFrameValue));
}