/// <inheritdoc cref="RelayCommand(ExecuteHandler{object}, CanExecuteHandler{object})"/>
public RelayCommand(ExecuteHandler execute, CanExecuteHandler canExecute = null)
: this
(
p => execute(),
p => canExecute?.Invoke() ?? true
)
{
}
public bool CanExecute(object parameter = null)
{
if (!m_enabled)
{
return(false);
}
var canExecute = CanExecuteHandler?.Invoke(parameter);
//either no handler (enabled) or use value returned by handler
return(!canExecute.HasValue || canExecute.Value);
}
private static void RaiseCanExecute(IntPtr cPtr, IntPtr sender, IntPtr e)
{
try {
if (Noesis.Extend.Initialized)
{
long ptr = cPtr.ToInt64();
if (sender == IntPtr.Zero && e == IntPtr.Zero)
{
_CanExecute.Remove(ptr);
return;
}
CanExecuteHandler handler = null;
if (!_CanExecute.TryGetValue(ptr, out handler))
{
throw new InvalidOperationException("Delegate not registered for CanExecute event");
}
handler?.Invoke(Noesis.Extend.GetProxy(sender, false), new CanExecuteRoutedEventArgs(e, false));
}
}
catch (Exception exception) {
Noesis.Error.UnhandledException(exception);
}
}
/// <summary>Вызов разрешающего метода команды</summary> /// <param name="parameter">Параметр команды</param> /// <returns>True - если выполнение команды разрешено</returns> public bool CanExecute(object parameter) => _canExecute == null ? true : _canExecute.Invoke(parameter);
public bool CanExecute(object parameter) => CanExecuteHandler?.Invoke(parameter) ?? true;
/// <summary>Вызов метода, возвращающего состояние команды.</summary> /// <param name="parameter">Параметр команды.</param> /// <returns><see langword="true"/> - если выполнение команды разрешено.</returns> public bool CanExecute(object parameter) => canExecute?.Invoke(parameter) ?? true;
/// <inheritdoc cref="ICommand.CanExecute(object)"/>
public bool CanExecute(object parameter)
{
return(canExecute?.Invoke(parameter) ?? true);
}