public TimedTextElement()
{
Type = "captionelement";
Style = new TimedTextStyle();
Animations = new MediaMarkerCollection <TimedTextAnimation>();
Children = new MediaMarkerCollection <TimedTextElement>();
}
private static void UpdateCaptions <TElement>(MediaMarkerCollection <TElement> originalElements, IEnumerable <TElement> newElements) where TElement : TimedTextElement
{
foreach (var updatedElement in newElements)
{
if (originalElements.ContainsId(updatedElement.Id))
{
bool updated = false;
var originalElement = originalElements.GetById(updatedElement.Id);
if (originalElement.Begin > updatedElement.Begin)
{
updated = true;
originalElement.Begin = updatedElement.Begin;
}
if (originalElement.End < updatedElement.End)
{
updated = true;
originalElement.End = updatedElement.End;
}
if (updated)
{
originalElement.NotifyPositionChanged();
}
UpdateCaptions(originalElement.Children, updatedElement.Children);
}
else
{
originalElements.Add(updatedElement);
}
}
}
public TimedTextElement()
{
Type = "captionelement";
Style = new TimedTextStyle();
Animations = new MediaMarkerCollection<TimedTextAnimation>();
Children = new MediaMarkerCollection<TimedTextElement>();
}
/// <summary>
/// Checks for markers that have been skipped.
/// </summary>
public void CheckForSkippedMarkers(TimeSpan mediaPosition, MediaMarkerCollection <T> markers)
{
if (PreviousPosition.HasValue)
{
bool movingForward = mediaPosition > PreviousPosition.Value;
TimeSpan rangeStart = movingForward ? PreviousPosition.Value : mediaPosition;
TimeSpan rangeEnd = movingForward ? mediaPosition : PreviousPosition.Value;
var skippedMarkers = markers.WhereContainedByRange(rangeStart, rangeEnd);
skippedMarkers.ForEach(OnMarkerSkipped);
}
}
/// <summary>
/// Checks for markers whose position has been reached or left.
/// </summary>
public void CheckMarkerPositions(TimeSpan mediaPosition, MediaMarkerCollection <TMediaMarker> markers, bool seeking = false, bool ignoreSearchWindow = false)
{
lock (_syncObject)
{
// clean up any previously active markers that are no longer in the markers list
PreviouslyActiveMarkers.ToList()
.Where(i => !markers.Contains(i))
.ForEach(OnMarkerLeft)
.ForEach(i => PreviouslyActiveMarkers.Remove(i));
//Safeguard against large unusual position changes
if (!seeking && PreviousPosition.HasValue)
{
var rangeStart = PreviousPosition.Value < mediaPosition ? PreviousPosition.Value : mediaPosition;
var rangeEnd = PreviousPosition.Value > mediaPosition ? PreviousPosition.Value : mediaPosition;
seeking = rangeEnd.Subtract(rangeStart) > LargestNormalStepSize;
}
IList <TMediaMarker> activeMarkers;
var searchAfter = SeekingSearchWindow.HasValue && !ignoreSearchWindow
? mediaPosition.Subtract(SeekingSearchWindow.Value)
: (TimeSpan?)null;
if (!seeking && PreviousPosition.HasValue)
{
var rangeStart = PreviousPosition.Value < mediaPosition ? PreviousPosition.Value : mediaPosition;
var rangeEnd = PreviousPosition.Value > mediaPosition ? PreviousPosition.Value : mediaPosition;
activeMarkers = markers.WhereActiveInRange(rangeStart, rangeEnd, searchAfter).ToList();
}
else
{
activeMarkers = markers.WhereActiveAtPosition(mediaPosition, searchAfter).ToList();
}
PreviouslyActiveMarkers.Where(i => !i.IsActiveAtPosition(mediaPosition))
.ForEach(OnMarkerLeft)
.ForEach(i => activeMarkers.Remove(i));
activeMarkers.Where(i => !PreviousPosition.HasValue || !PreviouslyActiveMarkers.Contains(i))
.ForEach(i => OnMarkerReached(i, seeking));
PreviouslyActiveMarkers = PreviouslyActiveMarkers.Where(i => i.IsActiveAtPosition(mediaPosition) && !activeMarkers.Contains(i))
.Concat(activeMarkers)
.ToList();
PreviousPosition = mediaPosition;
}
}
public TimedTextCaptions(IMarkerManager<CaptionRegion> CaptionManager = null, Func<MediaMarkerCollection<TimedTextElement>, IMarkerManager<TimedTextElement>> RegionManagerFactory = null)
{
DefaultStyleKey = typeof(TimedTextCaptions);
factory.NewMarkers += NewMarkers;
factory.MarkersRemoved += MarkersRemoved;
this.SizeChanged += this_SizeChanged;
captionManager = CaptionManager ?? new MediaMarkerManager<CaptionRegion>();
regionManagerFactory = RegionManagerFactory ?? (m => new MediaMarkerManager<TimedTextElement>() { Markers = m });
Captions = new MediaMarkerCollection<CaptionRegion>();
captionManager.MarkerLeft += captionManager_MarkerLeft;
captionManager.MarkerReached += captionManager_MarkerReached;
}
private void OnCaptionsChanged(MediaMarkerCollection<CaptionRegion> oldValue, MediaMarkerCollection<CaptionRegion> newValue)
{
if (newValue != null)
{
newValue.CollectionChanged += Captions_CollectionChanged;
newValue.MarkerPositionChanged += CaptionPositionChanged;
}
if (oldValue != null)
{
oldValue.CollectionChanged -= Captions_CollectionChanged;
oldValue.MarkerPositionChanged -= CaptionPositionChanged;
}
}
private void OnChaptersChanged(MediaMarkerCollection<Chapter> oldChapters, MediaMarkerCollection<Chapter> newChapters)
{
oldChapters.IfNotNull(i => i.CollectionChanged -= Chapters_CollectionChanged);
newChapters.IfNotNull(i => i.CollectionChanged += Chapters_CollectionChanged);
ChaptersChanged.IfNotNull(i => i(this, EventArgs.Empty));
}
private void OnAdMarkersChanged(MediaMarkerCollection<AdMarker> oldAdMarkers, MediaMarkerCollection<AdMarker> newAdMarkers)
{
oldAdMarkers.IfNotNull(i => i.CollectionChanged -= AdMarkers_CollectionChanged);
newAdMarkers.IfNotNull(i => i.CollectionChanged += AdMarkers_CollectionChanged);
AdMarkersChanged.IfNotNull(i => i(this, EventArgs.Empty));
}
private void OnTimelineMarkersChanged(MediaMarkerCollection<TimelineMediaMarker> oldTimelineMarkers, MediaMarkerCollection<TimelineMediaMarker> newTimelineMarkers)
{
oldTimelineMarkers.IfNotNull(i => i.CollectionChanged -= TimelineMarkers_CollectionChanged);
newTimelineMarkers.IfNotNull(i => i.CollectionChanged += TimelineMarkers_CollectionChanged);
TimelineMarkersChanged.IfNotNull(i => i(this, EventArgs.Empty));
}
public MediaMarkerManager()
{
Markers = new MediaMarkerCollection();
}
