private static void OnCommandChanged(EventToCommand element, DependencyPropertyChangedEventArgs e)
{
if (element == null)
{
return;
}
if (e.OldValue != null)
{
#if NET45
CanExecuteChangedEventManager.RemoveHandler((ICommand)e.OldValue, element.OnCommandCanExecuteChanged);
#else
((ICommand)e.OldValue).CanExecuteChanged -= element.OnCommandCanExecuteChanged;
#endif
}
var command = (ICommand)e.NewValue;
if (command != null)
{
#if NET45
CanExecuteChangedEventManager.AddHandler(command, element.OnCommandCanExecuteChanged);
#else
command.CanExecuteChanged += element.OnCommandCanExecuteChanged;
#endif
}
element.EnableDisableElement();
}
protected virtual void OnCommandChanged(ICommand OldValue, ICommand NewValue)
{
if (onCommandUpdated == null)
{
onCommandUpdated = (o, e) => UpdateFromCommand();
}
if (OldValue != null)
{
CanExecuteChangedEventManager.RemoveHandler(OldValue, onCommandUpdated);
}
if (NewValue != null)
{
CanExecuteChangedEventManager.AddHandler(NewValue, onCommandUpdated);
}
onCommandUpdated(null, null);
var oruc = OldValue as RoutedUICommand;
var nruc = NewValue as RoutedUICommand;
if (oruc != null && Equals(Header, oruc.Text))
{
this.ClearValue(HeaderProperty);
}
if (nruc != null && this.HasDefaultValue(HeaderProperty))
{
Header = nruc.Text;
}
}
private void UnhookCommand(ICommand command)
{
#if RIBBON_IN_FRAMEWORK
CanExecuteChangedEventManager.RemoveHandler(command, OnCanExecuteChanged);
#else
if (_canExecuteChangedHandler != null)
{
command.CanExecuteChanged -= _canExecuteChangedHandler;
_canExecuteChangedHandler = null;
}
#endif
UpdateCanExecute();
}
private void UnhookCommand(ICommand command)
{
#if NET4
var handler = CommandHelpers.GetCanExecuteChangedHandler(this);
if (handler != null)
{
command.CanExecuteChanged -= handler;
CommandHelpers.SetCanExecuteChangedHandler(this, null);
}
#else
CanExecuteChangedEventManager.RemoveHandler(command, new EventHandler <EventArgs>(this.OnCanExecuteChanged));
#endif
this.UpdateCanExecute();
}
/// <summary>
/// Called when the <see cref="Command"/> property changed.
/// </summary>
/// <param name="oldCommand">The old value.</param>
/// <param name="newCommand">The new value.</param>
protected virtual void OnCommandChanged(ICommand oldCommand, ICommand newCommand)
{
if (oldCommand != null)
{
CanExecuteChangedEventManager.RemoveHandler(oldCommand, OnCanExecuteChanged);
}
if (newCommand != null)
{
CanExecuteChangedEventManager.AddHandler(newCommand, OnCanExecuteChanged);
}
OnCanExecuteChanged();
}
private void UnhookCommand(ICommand command)
{
CanExecuteChangedEventManager.RemoveHandler(command, new EventHandler <EventArgs>(this.OnCanExecuteChanged));
this.UpdateCanExecute();
}
private void UnhookCommand(ICommand command)
{
CanExecuteChangedEventManager.RemoveHandler(command, OnCanExecuteChanged);
UpdateCanExecute();
}
private void UnhookCommand(ICommand command)
{
Debug.Assert(command != null);
CanExecuteChangedEventManager.RemoveHandler(command, OnCanExecuteChanged);
UpdateCanExecute();
}