/// <summary>
/// Removes any link that the given <paramref name="element"/> contains.
/// </summary>
/// <param name="element">The element to clean the links.</param>
public void UnlinkElement(TimelineElement element)
{
TimelineElementLink link = this.elementLinks.Where(l => l.ElementId == element.Id).SingleOrDefault();
if (link != null)
{
this.elementLinks.Remove(link);
link = this.elementLinks.Where(l => l.NextElementId == element.Id).SingleOrDefault();
if (link != null)
{
link.NextElementId = Guid.Empty;
}
link = this.elementLinks.Where(l => l.PreviousElementId == element.Id).SingleOrDefault();
if (link != null)
{
link.PreviousElementId = Guid.Empty;
}
this.CleanEmptyLinks();
}
}
/// <summary>
/// Tries to link the given <paramref name="element"/> to a next element in the timeline.
/// </summary>
/// <param name="element">The element being linked.</param>
/// <param name="nextElement">The next element being linked to the element.</param>
/// <returns>True if the link is effective;otherwise false.</returns>
public bool LinkNextElement(TimelineElement element, TimelineElement nextElement)
{
if (element.Position + element.Duration != nextElement.Position)
{
// Elements are not in the correct position
return(false);
}
var link = this.elementLinks.Where(l => l.ElementId == element.Id).SingleOrDefault();
if (link == null)
{
link = new TimelineElementLink(element.Id);
this.elementLinks.Add(link);
}
link.NextElementId = nextElement.Id;
link = this.elementLinks.Where(l => l.ElementId == nextElement.Id).SingleOrDefault();
if (link == null)
{
link = new TimelineElementLink(nextElement.Id);
this.elementLinks.Add(link);
}
link.PreviousElementId = element.Id;
this.OnElementLinked(element);
return(true);
}
/// <summary>
/// Determines if two elements are linked or not.
/// </summary>
/// <param name="element">The element to verify is linked to other element.</param>
/// <param name="linkedElement">The linked element to verify if is linked to the element.</param>
/// <returns>True if the elements are linked;otherwise false.</returns>
public bool IsElementLinkedTo(TimelineElement element, TimelineElement linkedElement)
{
if (element == null || linkedElement == null)
{
return(false);
}
TimelineElementLink link = this.GetElementLink(element);
return(link.PreviousElementId == linkedElement.Id || link.NextElementId == linkedElement.Id);
}
/// <summary>
/// Looks to the first element linked starting from the given <paramref name="element"/>.
/// </summary>
/// <param name="element">The element to start the search.</param>
/// <param name="layer">The track where the element is being searched.</param>
/// <returns>The first element linked.</returns>
public TimelineElement FindFirstElementLinking(TimelineElement element, Track layer)
{
TimelineElement firstElement = element;
TimelineElementLink link = this.GetElementLink(element);
TimelineElement linkedElement = layer.Shots.Where(e => e.Id == link.PreviousElementId).SingleOrDefault();
while (linkedElement != null)
{
firstElement = linkedElement;
link = this.GetElementLink(linkedElement);
linkedElement = layer.Shots.Where(e => e.Id == link.PreviousElementId).SingleOrDefault();
}
return(firstElement);
}
