/// <summary>
/// 当项容被清空时，
/// 解除事件处理程序。
/// </summary>
protected override void ClearContainerForItemOverride(DependencyObject element, object item)
{
CheckableListBoxItem ckItem = element as CheckableListBoxItem;
ckItem.Checked -= clbitem_Checked;
ckItem.UnChecked -= clbitem_UnChecked;
base.ClearContainerForItemOverride(element, item);
}
void clbitem_UnChecked(object sender, RoutedEventArgs e)
{
CheckableListBoxItem citem = (CheckableListBoxItem)e.Source;
object value = citem.Content;
m_checkedItems.Remove(value);
SetValue(CheckedItemsProperty, m_checkedItems);
}
void clbitem_Checked(object sender, RoutedEventArgs e)
{
CheckableListBoxItem citem = (CheckableListBoxItem)(e.Source);
object value = citem.Content;
if (m_checkedItems.SingleOrDefault(o => object.ReferenceEquals(o, value)) == null)
{
m_checkedItems.Add(value);
SetValue(CheckedItemsProperty, m_checkedItems);
}
}
private static void IsCheckedPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
CheckableListBoxItem lt = d as CheckableListBoxItem;
if (lt != null)
{
if (e.NewValue != e.OldValue)
{
bool b = (bool)e.NewValue;
if (b == true)
{
lt.RaiseCheckedEvent();
}
else
{
lt.RaiseUnCheckedEvent();
}
}
}
}