protected override void OnPreviewKeyDown(KeyEventArgs e)
{
if (!isFilterActive &&
((e.Key > Key.A && e.Key < Key.Z) ||
(e.Key > Key.OemSemicolon && e.Key < Key.Oem102)))
{
// Start activating the filter on the first key stroke.
isFilterActive = true;
}
else if (isFilterActive && e.Key == Key.Return)
{
// When the filter is active and the user press return we handle it
// by closing the drop-down and select the whole text.
// If the auto-complete feature of the combo box had select an item this
// item will be left selected, otherwise the text the user enter will
// remain in the editable text box.
// If we do not handle this case the combo box will clear the combo box because
// during filtering no item is selected in the drop-down so the combo box does
// not use auto-complete's selected item.
object selectedValue = SelectedValue;
ClearFilter();
e.Handled = true;
IsDropDownOpen = false;
EditableTextBox.SelectAll();
SelectedValue = selectedValue;
return;
}
base.OnPreviewKeyDown(e);
}
private void EditableTextBox_GotKeyboardFocus(object sender, RoutedEventArgs e)
{
if (ignoreFocus)
{
ignoreFocus = false;
}
else
{
EditableTextBox.SelectAll();
}
}
protected override void OnPreviewKeyDown(KeyEventArgs e)
{
if (!_isFilterActive &&
((e.Key >= Key.A && e.Key <= Key.Z) ||
(e.Key > Key.OemSemicolon && e.Key < Key.Oem102)))
{
_isFilterActive = true;
}
else if (_isFilterActive && e.Key == Key.Return)
{
var selectedValue = SelectedValue;
ClearFilter();
e.Handled = true;
IsDropDownOpen = false;
EditableTextBox.SelectAll();
SelectedValue = selectedValue;
return;
}
base.OnPreviewKeyDown(e);
}
private void RestoreSavedText()
{
Text = _textSaved ? _savedText : "";
EditableTextBox.SelectAll();
}