Mercurial > silverbladetech

annotate SilverlightGlimpse/SilverlightValidation/Commands/RelayCommand.cs @ 74:a79e235177f5

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Working version
author Steven Hollidge <stevenhollidge@hotmail.com>
date Mon, 23 Apr 2012 20:29:55 +0100
parents a0bcd783e612
children 86ed4919b126
rev   line source
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1 using System;
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2 using System.Windows.Input;
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3
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4 namespace SilverlightValidation.Commands
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5 {
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6 public class RelayCommand : ICommand
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7 {
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8 public event EventHandler CanExecuteChanged = delegate { };
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9
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10 readonly Action<object> _execute;
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11 readonly Predicate<object> _canExecute;
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12
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13 public RelayCommand(Action<object> execute,
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14 Predicate<object> canExecute = null)
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15 {
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16 if (execute == null) throw new ArgumentNullException("execute");
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17
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18 _execute = execute;
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19 _canExecute = canExecute;
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20 }
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21
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22
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23 public void UpdateCanExecuteCommand()
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24 {
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25 CanExecuteChanged(this, new EventArgs());
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26 }
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28
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29 public bool CanExecute(object parameter)
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30 {
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31 return _canExecute == null || _canExecute(parameter);
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32 }
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33
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34
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35 public void Execute(object parameter)
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36 {
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37 _execute(parameter);
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38 }
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39 }
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40 }