internal void OnPrepareOpening(PrepareOpeningEventArgs args)
{
if (PrepareOpening != null)
{
PrepareOpening(this, args);
}
}
internal void DoAutocomplete(bool forced)
{
if (!Menu.Enabled)
{
Menu.Close();
return;
}
visibleItems.Clear();
FocussedItemIndex = 0;
VerticalScroll.Value = 0;
//some magic for update scrolls
AutoScrollMinSize -= new Size(1, 0);
AutoScrollMinSize += new Size(1, 0);
//get fragment around caret
Range fragment = tb.Selection.GetFragment(Menu.SearchPattern);
string text = fragment.Text;
PrepareOpeningEventArgs args = new PrepareOpeningEventArgs(false, text, fragment.Start);
Menu.OnPrepareOpening(args);
if (args.Cancel)
{
Menu.Close();
return;
}
//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 && /*pops up only if selected range is empty*/
(tb.Selection.Start > fragment.Start || text.Length == 0 /*pops up only if caret is after first letter*/)))
{
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.Hidden)
{
visibleItems.Add(item);
}
if (res == CompareResult.VisibleAndSelected && !foundSelected)
{
foundSelected = true;
FocussedItemIndex = visibleItems.Count - 1;
}
}
if (foundSelected)
{
AdjustScroll();
DoSelectedVisible();
}
var sortingArgs = new PrepareSortingEventArgs(visibleItems, text);
Menu.OnPrepareSorting(sortingArgs);
visibleItems = sortingArgs.FilteredItems;
}
//show popup menu (only if at least one item that is not the already existing text)
if ((Count > 1) ||
((Count == 1) &&
(visibleItems[0].Text.Length > text.Length)))
{
if (!Menu.Visible)
{
CancelEventArgs args2 = new CancelEventArgs();
Menu.OnOpening(args2);
if (!args.Cancel)
{
Menu.Show(tb, point);
}
}
else
{
Invalidate();
}
}
else
{
Menu.Close();
}
}