/// <summary>Internal delegate to handle adding new string to items.</summary>
/// <param name="sender">The sender value.</param>
/// <param name="expandableStringComboBoxEvent">The expandableStringComboBoxEvent value.</param>
private static void AddToListEvent(object sender, ExpandableStringComboBoxEvent expandableStringComboBoxEvent)
{
var ctrl = (ExpandableStringComboBox)sender;
if (ctrl.ListTerminator != null)
{
ctrl.Items.Insert(ctrl.Items.Count - 1, expandableStringComboBoxEvent.Input); // combo will sort automatically, if Sort=true
}
else
{
ctrl.Items.Add(expandableStringComboBoxEvent.Input);
}
}
/// <summary>Internal handler to handle user selection. The method triggers GetNewStringEvent if user selects the ListTerminator-option.</summary>
/// <param name="sender">The sender value.</param>
/// <param name="eventArgs">The eventArgs value.</param>
private void SelectionChangeCommittedHandler(object sender, EventArgs eventArgs)
{
if (this.ListTerminator != null && this.ListTerminator.Equals(this.SelectedItem))
{
var previousValue = (-1 != this.previousIndex) ? this.Items[this.previousIndex] as string : string.Empty;
string result = null;
if (this.GetNewStringEvent != null)
{
var newEvent = new ExpandableStringComboBoxEvent(previousValue);
this.GetNewStringEvent(this, newEvent);
result = newEvent.Result;
}
if (result != null)
{
if (!this.Items.Contains(result))
{
// add only if value not in the list
this.AddNewString(result);
}
this.SelectedIndex = this.previousIndex = this.Items.IndexOf(result);
this.Text = result;
}
else
{
// restore previous
this.SelectedIndex = this.previousIndex;
}
}
else
{
this.previousIndex = this.SelectedIndex;
}
}
