protected void AddLastFrame(KeyFrame frame)
{
if (this.lastFrame == null)
{
this.firstFrame = frame;
this.lastFrame = frame;
}
else
{
if (frame.Time <= this.lastFrame.Time)
throw new ArgumentException("time must be greater than last frame");
AddFrameAfter(this.lastFrame, frame);
}
}
protected void AddFrameBefore(KeyFrame frame, KeyFrame newFrame)
{
if (frame.Previous != null)
{
frame.Previous.Next = newFrame;
newFrame.Previous = frame.Previous;
}
else
{
this.firstFrame = newFrame;
}
frame.Previous = newFrame;
newFrame.Next = frame;
}
internal void RemoveFramesBefore(int time)
{
if (LastFrame == null)
throw new ArgumentException("No key frame is added");
if (time >= LastFrame.Time)
throw new ArgumentException("Cannot remove first frame");
var frame = FindFrameBefore(time);
if (frame != null)
{
frame.Next.Previous = null;
this.firstFrame = frame.Next;
}
}
protected void AddFrameAfter(KeyFrame frame, KeyFrame newFrame)
{
if (frame.Next != null)
{
frame.Next.Previous = newFrame;
newFrame.Next = frame.Next;
}
else
{
this.lastFrame = newFrame;
}
frame.Next = newFrame;
newFrame.Previous = frame;
}
internal void RemoveFramesAfter(int time)
{
if (FirstFrame == null)
throw new ArgumentException("No key frame is added");
if (time <= FirstFrame.Time)
throw new ArgumentException("Cannot remove first frame");
var frame = FindFrameAfter(time);
if (frame != null)
{
frame.Previous.Next = null;
this.lastFrame = frame.Previous;
}
}