internal void DoAutocomplete(bool forced)
{
if (!Menu.Enabled)
{
Menu.Close();
return;
}
visibleItems.Clear();
selectedItemIndex = 0;
VerticalScroll.Value = 0;
//get fragment around caret
Range fragment = tb.Selection.GetFragment(Menu.SearchPattern);
string text = fragment.Text;
//calc screen point for popup menu
Point point = tb.PlaceToPoint(fragment.End);
point.Offset(2, tb.CharHeight);
if (forced || (text.Length >= Menu.MinFragmentLength && tb.Selection.IsEmpty))
{
Menu.Fragment = fragment;
bool foundSelected = false;
//build popup menu
foreach (var item in sourceItems)
{
item.Parent = Menu;
CompareResult res = item.Compare(text);
if (res == CompareResult.ExactAndReplace)
{
tb.TextSource.Manager.BeginAutoUndoCommands();
try {
DoAutocomplete(item, fragment);
return;
} finally {
tb.TextSource.Manager.EndAutoUndoCommands();
}
}
else if (res != CompareResult.Hidden)
{
visibleItems.Add(item);
}
if (res == CompareResult.VisibleAndSelected && !foundSelected)
{
foundSelected = true;
selectedItemIndex = visibleItems.Count - 1;
}
}
if (foundSelected)
{
AdjustScroll();
DoSelectedVisible();
}
}
//show popup menu
if (Count > 0)
{
if (!Menu.Visible)
{
CancelEventArgs args = new CancelEventArgs();
Menu.OnOpening(args);
if (!args.Cancel)
{
Menu.Show(tb, point);
}
}
else
{
Invalidate();
}
}
else
{
Menu.Close();
}
}