Sonic: A WPF (hybrid smart client) searchable media library

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Input;

namespace Sonic
{
    /// <summary>
    /// Implements the ICommand and wraps up all the verbose 
    /// stuff so that you can just pass 2 delegates 1 for the 
    /// CanExecute and one for the Execute
    /// </summary>
    public class SimpleCommand : ICommand
    {
        /// <summary>
        /// Gets or sets the Predicate to execute when the 
        /// CanExecute of the command gets called
        /// </summary>
        public Predicate<object> CanExecuteDelegate { get; set; }

        /// <summary>
        /// Gets or sets the action to be called when the 
        /// Execute method of the command gets called
        /// </summary>
        public Action<object> ExecuteDelegate { get; set; }

        #region ICommand Members

        /// <summary>
        /// Checks if the command Execute method can run
        /// </summary>
        /// <param name="parameter">THe command parameter to 
        /// be passed</param>
        /// <returns>Returns true if the command can execute. 
        /// By default true is returned so that if the user of 
        /// SimpleCommand does not specify a CanExecuteCommand 
        /// delegate the command still executes.</returns>
        public bool CanExecute(object parameter)
        {
            if (CanExecuteDelegate != null)
                return CanExecuteDelegate(parameter);
            return true;// if there is no can execute default to true
        }

        public event EventHandler CanExecuteChanged
        {
            add { CommandManager.RequerySuggested += value; }
            remove { CommandManager.RequerySuggested -= value; }
        }

        /// <summary>
        /// Executes the actual command
        /// </summary>
        /// <param name="parameter">THe command parameter to be passed</param>
        public void Execute(object parameter)
        {
            if (ExecuteDelegate != null)
                ExecuteDelegate(parameter);
        }

        #endregion
    }
}