source code checkin

src/ServerManager.Common/Lib/RelayCommand.cs

@@ -0,0 +1,84 @@
+using System;
+using System.Windows.Input;
+
+namespace ServerManagerTool.Common.Lib
+{
+    public class RelayCommand<T> : ICommand
+    {
+        #region Fields
+
+        readonly Action<T> _execute = null;
+        readonly Predicate<T> _canExecute = null;
+
+        #endregion
+
+        #region Constructors
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="DelegateCommand{T}"/>.
+        /// </summary>
+        /// <param name="execute">Delegate to execute when Execute is called on the command.  This can be null to just hook up a CanExecute delegate.</param>
+        /// <remarks><seealso cref="CanExecute"/> will always return true.</remarks>
+        public RelayCommand(Action<T> execute)
+            : this(execute, null)
+        {
+        }
+
+        /// <summary>
+        /// Creates a new command.
+        /// </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
+
+        ///<summary>
+        ///Defines the method that determines whether the command can execute in its current state.
+        ///</summary>
+        ///<param name="parameter">Data used by the command.  If the command does not require data to be passed, this object can be set to null.</param>
+        ///<returns>
+        ///true if this command can be executed; otherwise, false.
+        ///</returns>
+        public bool CanExecute(object parameter)
+        {
+            try
+            {
+                return _canExecute == null ? true : _canExecute((T)parameter);
+            }
+            catch (Exception)
+            {
+                return false;
+            }
+        }
+
+        ///<summary>
+        ///Occurs when changes occur that affect whether or not the command should execute.
+        ///</summary>
+        public event EventHandler CanExecuteChanged
+        {
+            add { CommandManager.RequerySuggested += value; }
+            remove { CommandManager.RequerySuggested -= value; }
+        }
+
+        ///<summary>
+        ///Defines the method to be called when the command is invoked.
+        ///</summary>
+        ///<param name="parameter">Data used by the command. If the command does not require data to be passed, this object can be set to <see langword="null" />.</param>
+        public void Execute(object parameter)
+        {
+            _execute((T)parameter);
+        }
+
+        #endregion
+    }
+}