/// <summary>
/// This method reimplements DoSearch from <see cref="TextSearch"/>.
/// </summary>
/// <param name="textSearch"></param>
/// <param name="nextChar"></param>
private void DoSearch(TextSearchWrapper textSearch, string nextChar)
{
bool lookForFallbackMatchToo = false;
int startItemIndex = 0;
ItemCollection items = Items;
if (textSearch.IsActive)
{
startItemIndex = textSearch.MatchedItemIndex;
}
if (textSearch._charsEntered.Count > 0 && string.Compare(textSearch._charsEntered[textSearch._charsEntered.Count - 1], nextChar, true, TextSearchWrapper.GetCulture(this)) == 0)
{
lookForFallbackMatchToo = true;
}
string primaryTextPath = TextSearchWrapper.GetPrimaryTextPath(this);
bool wasNewCharUsed = false;
int matchingPrefix = TextSearchWrapper.FindMatchingPrefix(this, primaryTextPath, textSearch.Prefix, nextChar, startItemIndex, lookForFallbackMatchToo, ref wasNewCharUsed);
if (matchingPrefix != -1)
{
if (!textSearch.IsActive || matchingPrefix != startItemIndex)
{
if (SelectedItem != items[matchingPrefix])
{
SelectedItem = items[matchingPrefix];
BringItemIntoView(SelectedItem);
UpdateLayout();
var container = GetContainerFromItem(SelectedItem) as DataRow;
if (container != null)
{
var cellToFocus = container.FindVisualChildrenOfType <DataCell>().FirstOrDefault(x => x.Focusable);
if (cellToFocus != null)
{
Keyboard.Focus(cellToFocus);
}
}
}
textSearch.MatchedItemIndex = matchingPrefix;
}
if (wasNewCharUsed)
{
textSearch.AddCharToPrefix(nextChar);
}
if (!textSearch.IsActive)
{
textSearch.IsActive = true;
}
}
if (textSearch.IsActive)
{
textSearch.ResetTimeout();
}
}
/// <inheritdoc/>
protected override void OnTextInput(TextCompositionEventArgs e)
{
base.OnTextInput(e);
if (string.IsNullOrEmpty(e.Text) || !IsTextSearchEnabled || !Equals(e.Source, this) && !Equals(ItemsControlFromItemContainer(e.Source as DependencyObject), this))
{
return;
}
var textSearch = TextSearchWrapper.EnsureInstance(this);
if (textSearch == null)
{
return;
}
DoSearch(textSearch, e.Text);
e.Handled = true;
}