/// <summary>
/// Callback when the Command property is set or changed.
/// </summary>
private static void OnCommandInvalidated(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e)
{
if (dependencyObject == null)
{
throw new ArgumentNullException("dependencyObject");
}
UIElement element = (UIElement)dependencyObject;
// Clear the exisiting bindings on the element we are attached to.
element.CommandBindings.Clear();
// If we're given a new command model, set up a binding.
if (e.NewValue is CommandModel)
{
CommandModel commandModel = e.NewValue as CommandModel;
element.CommandBindings.Add(new CommandBinding(commandModel.Command, commandModel.OnExecute, commandModel.OnQueryEnabled));
}
// Suggest to WPF to refresh commands.
CommandManager.InvalidateRequerySuggested();
}
/// <summary>
/// Method used to set a single binding on an element.
/// Any exsisting bindings will be removed.
/// </summary>
public static void SetCommand(DependencyObject sender, CommandModel command)
{
sender.SetValue(CommandProperty, command);
}