/// <summary>
/// Saves a new verse number for the current position, moves back one position, and returns the verse number for the new position.
/// This method may only be called when <see cref="CanMoveBack"/> is <c>true</c>.
/// </summary>
/// <param name="currentAbsoluteVerseNumber">The new verse number for the current position.</param>
public int MoveBack(int currentAbsoluteVerseNumber)
{
if (currentAbsoluteVerseNumber == Bible.InvalidAbsoluteVerseNumber)
{
throw new InvalidOperationException("Invalid verse number");
}
if (!CanMoveBack)
{
throw new InvalidOperationException("Invalid state");
}
_history[_currentIndex] = currentAbsoluteVerseNumber;
var result = _history[--_currentIndex];
CanMoveChanged?.Invoke();
return(result);
}
/// <summary>
/// Notifies the history stack of a jump.
/// Saves a new verse number for the current position, inserts a new position in the stack, and moves forward to that position.
/// After this method is called, <see cref="CurrentAbsoluteVerseNumber"/> is equal to <paramref name="jumpAbsoluteVerseNumber"/>.
/// </summary>
/// <param name="currentAbsoluteVerseNumber">The new verse number for the current position.</param>
/// <param name="jumpAbsoluteVerseNumber">The verse number for the new position.</param>
public void AddJump(int currentAbsoluteVerseNumber, int jumpAbsoluteVerseNumber)
{
if (currentAbsoluteVerseNumber == Bible.InvalidAbsoluteVerseNumber || jumpAbsoluteVerseNumber == Bible.InvalidAbsoluteVerseNumber)
{
throw new InvalidOperationException("Invalid verse number");
}
_history[_currentIndex] = currentAbsoluteVerseNumber;
// If the user is jumping from the same location, don't insert a duplicate.
if (currentAbsoluteVerseNumber == jumpAbsoluteVerseNumber)
{
return;
}
// If the user is jumping to the same location, don't insert a duplicate.
var next = (_currentIndex == _history.Count - 1) ? Bible.InvalidAbsoluteVerseNumber : _history[_currentIndex + 1];
if (next == jumpAbsoluteVerseNumber)
{
++_currentIndex;
CanMoveChanged?.Invoke();
return;
}
_history.Insert(++_currentIndex, jumpAbsoluteVerseNumber);
if (_history.Count > MaxHistory)
{
if (_currentIndex <= MaxHistory / 2)
{
_history.RemoveAt(_history.Count - 1);
}
else
{
_history.RemoveAt(0);
--_currentIndex;
}
}
CanMoveChanged?.Invoke();
}
public void TakeInfoAboutPlayer(bool abilityMove)
{
CanMoveChanged?.Invoke(abilityMove);
_animator.Play("Back_Idle");
}
