private void TextBox_KeyDown(object sender, KeyEventArgs e)
{
if (e.Key != Key.Back && e.Key != Key.Enter && e.Key != Key.Tab &&
e.Key != Key.Escape)
{
return;
}
var textBox = sender as ComboBox;
if (textBox == null)
{
return;
}
if (e.Key != Key.Back)
{
if (string.IsNullOrWhiteSpace(textBox.Text))
{
return;
}
AddNewTag(textBox.Text.Trim());
textBox.Text = "";
if (e.Key == Key.Tab)
{
FocusAdvancement.MoveFocus(textBox, Keyboard.Modifiers == ModifierKeys.Shift ? FocusNavigationDirection.Previous : FocusNavigationDirection.Next);
}
else if (e.Key == Key.Escape)
{
FocusAdvancement.RemoveFocus(textBox);
}
}
else if (string.IsNullOrWhiteSpace(textBox.Text) || IsCaretAtFront(textBox))
{
FocusAdvancement.MoveFocus(textBox, FocusNavigationDirection.Previous);
}
else
{
return;
}
e.Handled = true;
}
protected override void OnPreviewKeyDown(KeyEventArgs e)
{
switch (e.Key)
{
case Key.Escape:
e.Handled = FocusAdvancement.RemoveFocus(this);
break;
case Key.Enter:
if (!AcceptsReturn)
{
e.Handled = FocusAdvancement.MoveFocus(this);
}
break;
case Key.Tab:
if (Keyboard.Modifiers == ModifierKeys.Shift && FocusAdvancement.MoveFocus(this, FocusNavigationDirection.Previous))
{
e.Handled = true;
}
break;
case Key.Up:
case Key.Down:
if (GetMode(this) != SpecialMode.None)
{
var processed = ProcessText(Text, e.Key == Key.Up ? 1d : -1d);
if (processed != null)
{
SetTextBoxText(this, processed);
}
e.Handled = true;
}
break;
}
if (!e.Handled)
{
base.OnPreviewKeyDown(e);
}
}