/// <summary>
/// Gets the previoust lesson if available.
/// </summary>
/// <returns>The previoust lesson.</returns>
/// <param name="currentLesson">Current lesson.</param>
public Lesson GetPrevioustLesson(Lesson currentLesson)
{
if (HasPreviousLesson(currentLesson))
{
var index = Lessons.IndexOf(currentLesson) - 1;
return Lessons.ElementAt(index);
}
return null;
}
/// <summary>
/// Gets the next lesson if available.
/// </summary>
/// <returns>The next lesson.</returns>
/// <param name="currentLesson">Current lesson.</param>
public Lesson GetNextLesson(Lesson currentLesson)
{
if (HasNextLesson(currentLesson))
{
var index = Lessons.IndexOf(currentLesson) + 1;
return Lessons.ElementAt(index);
}
return null;
}
/// <summary>
/// Determines whether there is a next lesson available from the provided lesson
/// </summary>
/// <returns><c>true</c> if this module has a next lesson; otherwise, <c>false</c>.</returns>
/// <param name="currentLesson">Current lesson.</param>
public bool HasNextLesson(Lesson currentLesson)
{
var index = Lessons.IndexOf(currentLesson);
return Lessons.Count - 1 > index;
}
/// <summary>
/// Determines whether there is a previous lesson available from the provided lesson
/// </summary>
/// <returns><c>true</c> if this module has a previous lesson; otherwise, <c>false</c>.</returns>
/// <param name="currentLesson">Current lesson.</param>
public bool HasPreviousLesson(Lesson currentLesson)
{
var index = Lessons.IndexOf(currentLesson);
return index > 0;
}
public ProgressListRefreshRequestedEventArgs(Lesson lesson)
: base()
{
this.Lesson = lesson;
}
protected void FireProgressListRefreshRequested(Lesson lesson)
{
if (ProgressListRefreshRequested != null)
ProgressListRefreshRequested(this, new ProgressListRefreshRequestedEventArgs(lesson));
}
/// <summary>
/// Returns a new instance of the fragment type according to the type of lesson
/// </summary>
/// <returns>The fragment for the lesson.</returns>
/// <param name="lesson">current lesson.</param>
private LessonFragment CreateFragmentForLesson(Lesson lesson)
{
if (lesson is HearMe)
return new HearMeFragment(lesson);
if (lesson is FourPictures)
return new FourPicturesFragment(lesson);
if (lesson is PickSyllable)
return new PickSyllableFragment(lesson);
if (lesson is BuildSyllable)
return new BuildSyllableFragment(lesson);
if (lesson is FindMissingLetter)
return new FindMissingLetterFragment(lesson);
if (lesson is AbcRank)
return new AbcRankFragment(lesson);
if (lesson is LetterDrop)
return new LetterDropFragment(lesson);
return null;
}