整理一下项目文件

AIStudio.Wpf.DiagramDesigner/ViewModels/SimpleCommand.cs

@@ -0,0 +1,66 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows.Input;
+
+namespace AIStudio.Wpf.DiagramDesigner
+{
+    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; }
+
+
+        public SimpleCommand(Predicate<object> canExecuteDelegate, Action<object> executeDelegate)
+        {
+            CanExecuteDelegate = canExecuteDelegate;
+            ExecuteDelegate = executeDelegate;
+        }
+
+        public SimpleCommand(Action<object> executeDelegate)
+        {
+            ExecuteDelegate = executeDelegate;
+        }
+
+        #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
+    }
+}