/// <summary>
/// Adds a keyframe to the collection.
/// </summary>
/// <param name="keyframe">The keyframe to add to the collection.</param>
/// <returns><see langword="true"/> if the keyframe was added to the collection; otherwise, <see langword="false"/>.</returns>
public Boolean Add(AnimationKeyframe <T> keyframe)
{
Contract.Require(keyframe, nameof(keyframe));
if (Contains(keyframe))
{
return(false);
}
var index = 0;
if (Count > 0)
{
for (int i = 0; i < keyframes.Count - 1; i++)
{
if (keyframes[i].Time < keyframe.Time && keyframes[i + 1].Time >= keyframe.Time)
{
index = i + 1;
break;
}
}
index = keyframes.Count;
}
keyframes.Insert(index, keyframe);
animation.RecalculateDuration();
return(true);
}
/// <summary>
/// Removes the specified keyframe from the collection.
/// </summary>
/// <param name="keyframe">The keyframe to remove from the collection.</param>
/// <returns><see langword="true"/> if the keyframe was removed from the collection; otherwise, false.</returns>
public Boolean Remove(AnimationKeyframe <T> keyframe)
{
Contract.Require(keyframe, nameof(keyframe));
if (keyframes.Remove(keyframe))
{
animation.RecalculateDuration();
return(true);
}
return(false);
}
/// <summary>
/// Gets the keyframes that surround the specified moment in time.
/// </summary>
/// <param name="time">The time to evaluate.</param>
/// <param name="kf1">The keyframe that precedes the specified time.</param>
/// <param name="kf2">The keyframe that succeeds the specified time.</param>
public void GetKeyframes(TimeSpan time, out AnimationKeyframe <T> kf1, out AnimationKeyframe <T> kf2)
{
if (keyframes.Count == 0)
{
kf1 = null;
kf2 = null;
return;
}
if (time < keyframes[0].Time)
{
kf1 = null;
kf2 = keyframes[0];
return;
}
if (time > keyframes[keyframes.Count - 1].Time)
{
kf1 = keyframes[keyframes.Count - 1];
kf2 = null;
return;
}
for (int i = 0; i < keyframes.Count - 1; i++)
{
if (keyframes[i].Time <= time && keyframes[i + 1].Time >= time)
{
kf1 = keyframes[i];
kf2 = keyframes[i + 1];
return;
}
}
kf1 = keyframes[keyframes.Count - 1];
kf2 = null;
}
/// <summary>
/// Gets a value indicating whether the collection contains the specified keyframe.
/// </summary>
/// <param name="keyframe">The keyframe to evaluate.</param>
/// <returns><see langword="true"/> if the collection contains the specified keyframe; otherwise, <see langword="false"/>.</returns>
public Boolean Contains(AnimationKeyframe <T> keyframe)
{
Contract.Require(keyframe, nameof(keyframe));
return(keyframes.Contains(keyframe));
}