VisualPascalABCNET/FormsDesignerBinding/Dependecies/src/Main/ICSharpCode.SharpDevelop.Widgets/Project/RelayCommand.cs - master - n-dimens/pascalabcnet

VisualPascalABCNET/FormsDesignerBinding/Dependecies/src/Main/ICSharpCode.SharpDevelop.Widgets/Project/RelayCommand.cs
158 строк4 KB
Бондарев Иван
initial commit
14 май 2015, 22:35
14 май 2015, 22:35e6e67c1
/*
 * Created by SharpDevelop.
 * User: Peter Forstmeier
 * Date: 16.10.2011
 * Time: 19:40
 * 
 * To change this template use Tools | Options | Coding | Edit Standard Headers.
 */
using System;
using System.Diagnostics;
using System.Windows.Input;

namespace ICSharpCode.SharpDevelop.Widgets
{
	/// <summary>
	/// Description of RelayCommand.
	/// </summary>
	public class RelayCommand<T> : System.Windows.Input.ICommand
    {

        #region Declarations

        readonly Predicate<T> _canExecute;
        readonly Action<T> _execute;

        #endregion

        #region Constructors

        /// <summary>
        /// Initializes a new instance of the <see cref="RelayCommand&lt;T&gt;"/> class and the command can always be executed.
        /// </summary>
        /// <param name="execute">The execution logic.</param>
        public RelayCommand(Action<T> execute)
            : this(execute, null)
        {
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="RelayCommand&lt;T&gt;"/> class.
        /// </summary>
        /// <param name="execute">The execution logic.</param>
        /// <param name="canExecute">The execution status logic.</param>
        public RelayCommand(Action<T> execute, Predicate<T> canExecute)
        {

            if (execute == null)
                throw new ArgumentNullException("execute");
            _execute = execute;
            _canExecute = canExecute;
        }

        #endregion

        #region ICommand Members

        public event EventHandler CanExecuteChanged
        {
            add
            {

                if (_canExecute != null)
                    CommandManager.RequerySuggested += value;
            }
            remove
            {

                if (_canExecute != null)
                    CommandManager.RequerySuggested -= value;
            }
        }

        [DebuggerStepThrough]
        public Boolean CanExecute(Object parameter)
        {
            return _canExecute == null ? true : _canExecute((T)parameter);
        }

        public void Execute(Object parameter)
        {
            _execute((T)parameter);
        }

        #endregion
    }

    /// <summary>
    /// A command whose sole purpose is to relay its functionality to other objects by invoking delegates. The default return value for the CanExecute method is 'true'.
    /// </summary>
    public class RelayCommand : System.Windows.Input.ICommand
    {

        #region Declarations

        readonly Func<Boolean> _canExecute;
        readonly Action _execute;

        #endregion

        #region Constructors

        /// <summary>
        /// Initializes a new instance of the <see cref="RelayCommand&lt;T&gt;"/> class and the command can always be executed.
        /// </summary>
        /// <param name="execute">The execution logic.</param>
        public RelayCommand(Action execute)
            : this(execute, null)
        {
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="RelayCommand&lt;T&gt;"/> class.
        /// </summary>
        /// <param name="execute">The execution logic.</param>
        /// <param name="canExecute">The execution status logic.</param>
        public RelayCommand(Action execute, Func<Boolean> canExecute)
        {

            if (execute == null)
                throw new ArgumentNullException("execute");
            _execute = execute;
            _canExecute = canExecute;
        }

        #endregion

        #region ICommand Members

        public event EventHandler CanExecuteChanged
        {
            add
            {

                if (_canExecute != null)
                    CommandManager.RequerySuggested += value;
            }
            remove
            {

                if (_canExecute != null)
                    CommandManager.RequerySuggested -= value;
            }
        }

        [DebuggerStepThrough]
        public Boolean CanExecute(Object parameter)
        {
            return _canExecute == null ? true : _canExecute();
        }

        public void Execute(Object parameter)
        {
            _execute();
        }

        #endregion
    }
}