public void Clear()
{
items.Clear();
Index = 0;
OnQueueChange?.Invoke(this, null);
OnQueueIndexChange?.Invoke(this, null);
}
public bool TryPrevious()
{
if (0 == Index)
{
return(false);
}
--Index;
OnQueueChange?.Invoke(this, null);
OnQueueIndexChange?.Invoke(this, null);
return(true);
}
public bool TryNext()
{
if (Index == items.Count)
{
return(false);
}
if (++Index != items.Count)
{
OnQueueChange?.Invoke(this, null);
OnQueueIndexChange?.Invoke(this, null);
return(true);
}
return(false);
}
public bool Skip(int count)
{
if (count <= 0)
{
throw new ArgumentException("count too small");
}
int targetIndex = Index + count;
if (!Tools.IsBetween(targetIndex, 0, items.Count))
{
throw new ArgumentException("count too large");
}
Index = targetIndex;
OnQueueChange?.Invoke(this, null);
OnQueueIndexChange?.Invoke(this, null);
return(Index != items.Count);
}
public void Remove(int at)
{
if (!Tools.IsBetweenExcludingUpper(at, 0, items.Count))
{
throw new ArgumentException();
}
if (Index == at)
{
throw new InvalidOperationException("Can't remove the current item");
}
items.RemoveAt(at);
if (at < Index)
{
--Index;
OnQueueIndexChange?.Invoke(this, null);
}
OnQueueChange?.Invoke(this, null);
}
public void RemoveRange(int from, int to)
{
if (!Tools.IsBetweenExcludingUpper(from, 0, items.Count) ||
!Tools.IsBetweenExcludingUpper(to, 0, items.Count) || to < from)
{
throw new ArgumentException();
}
if (Tools.IsBetween(Index, from, to))
{
throw new InvalidOperationException("Can't remove the current item");
}
int count = to - from + 1;
items.RemoveRange(from, count);
if (to < Index)
{
Index -= count;
OnQueueIndexChange?.Invoke(this, null);
}
OnQueueChange?.Invoke(this, null);
}