/// <summary>
/// Retrieves the mapping collection
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
internal static CommandEventCollection InternalGetMappingCollection(
DependencyObject obj)
{
var map = obj.GetValue(MappingsProperty) as CommandEventCollection;
if (map == null)
{
map = new CommandEventCollection();
SetMappings(obj, map);
}
return(map);
}
/// <summary>
/// This changes the event mapping
/// </summary>
/// <param name="target"></param>
/// <param name="e"></param>
private static void OnMappingsChanged(DependencyObject target,
DependencyPropertyChangedEventArgs e)
{
if (e.OldValue != null)
{
CommandEventCollection cec = e.OldValue as CommandEventCollection;
if (cec != null)
{
cec.Unsubscribe(target);
}
}
if (e.NewValue != null)
{
CommandEventCollection cec = e.NewValue as CommandEventCollection;
if (cec != null)
{
cec.Subscribe(target);
}
}
}
/// <summary>
/// This sets the mapping collection.
/// </summary>
/// <param name="obj">Dependency Object</param>
/// <param name="value">Mapping collection</param>
public static void SetMappings(DependencyObject obj,
CommandEventCollection value)
{
obj.SetValue(MappingsProperty, value);
}