public bool Search(string nextChar)
{
int startIndex = isActive ? lastMatchIndex : Math.Max(0, treeView.SelectedIndex);
bool lookBackwards = inputStack.Count > 0 && string.Compare(inputStack.Peek(), nextChar, StringComparison.OrdinalIgnoreCase) == 0;
int nextMatchIndex = IndexOfMatch(matchPrefix + nextChar, startIndex, lookBackwards, out bool wasNewCharUsed);
if (nextMatchIndex != -1)
{
if (!isActive || nextMatchIndex != startIndex)
{
treeView.SelectedItem = treeView.Items[nextMatchIndex];
treeView.FocusNode((SharpTreeNode)treeView.SelectedItem);
lastMatchIndex = nextMatchIndex;
}
if (wasNewCharUsed)
{
matchPrefix += nextChar;
inputStack.Push(nextChar);
}
isActive = true;
}
if (isActive)
{
ResetTimeout();
}
return(nextMatchIndex != -1);
}