endFraction method
Assumes that duration
is the total length of the video that this
DurationRange is a segment form. It returns the percentage that start is
through the entire video.
For example, assume that the entire video is 4 minutes long. If end has a
duration of two minutes, this will return 0.5
since the DurationRange
ends 50% of the way through the video's total length.
Implementation
double endFraction(Duration duration) {
return end.inMilliseconds / duration.inMilliseconds;
}