/// <summary>
/// Handle the selected index changing. If the checkbox for the new selection isn't checked, check it. Leave all the other checkboxes alone.
/// </summary>
/// <param name="sender">The MultiComboBox.</param>
/// <param name="eventArgs">The event arguments.</param>
private static void OnSelectedIndexChanged(object sender, DependencyPropertyChangedEventArgs eventArgs)
{
MultiComboBox comboBox = sender as MultiComboBox;
if (comboBox.SelectedIndex >= 0 && !comboBox.SelectedItems.Contains(comboBox.listBox.Items[comboBox.SelectedIndex]))
{
comboBox.listBox.SelectedIndex = comboBox.SelectedIndex;
}
}
/// <summary>
/// Handle the separator changing. Update the display text.
/// </summary>
/// <param name="sender">The MultiComboBox.</param>
/// <param name="eventArgs">The event arguments.</param>
private static void OnSeparatorChanged(DependencyObject sender, DependencyPropertyChangedEventArgs eventArgs)
{
MultiComboBox comboBox = sender as MultiComboBox;
if (comboBox.IsLoaded)
{
comboBox.ResetDisplay();
}
}
/// <summary>
/// Deceit. Rather than allowing the value of SelectedValues to change, simply duplicate the contents of the incoming list to our internal
/// list.
/// </summary>
/// <param name="sender">The MultiComboBox.</param>
/// <param name="newValue">The incoming list.</param>
/// <returns>The combobox's selectedItems list.</returns>
private static object CoerceSelectedValues(DependencyObject sender, object newValue)
{
MultiComboBox comboBox = sender as MultiComboBox;
// The first time through we're actually setting SelectedValues to the private selectedValues list, so we'll let it get set.
if (!comboBox.initialized)
{
return(newValue);
}
else
{
comboBox.selectedValues.Clear();
if (newValue != null)
{
foreach (object value in newValue as IList)
{
comboBox.selectedValues.Add(value);
}
}
return(comboBox.selectedValues);
}
}