Mercurial > silverbladetech

annotate SilverlightGlimpse/SilverlightValidation/Commands/RelayCommand.cs @ 69:a0bcd783e612

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Latest work
author Steven Hollidge <stevenhollidge@hotmail.com>
date Mon, 23 Apr 2012 11:06:10 +0100
parents
children 86ed4919b126
rev   line source
69
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
1 using System;
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
2 using System.Windows.Input;
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
3
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
4 namespace SilverlightValidation.Commands
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
5 {
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
6 public class RelayCommand : ICommand
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
7 {
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
8 public event EventHandler CanExecuteChanged = delegate { };
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
9
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
10 readonly Action<object> _execute;
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
11 readonly Predicate<object> _canExecute;
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
12
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
13 public RelayCommand(Action<object> execute,
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
14 Predicate<object> canExecute = null)
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
15 {
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
16 if (execute == null) throw new ArgumentNullException("execute");
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
17
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
18 _execute = execute;
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
19 _canExecute = canExecute;
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
20 }
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
21
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
22
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
23 public void UpdateCanExecuteCommand()
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
24 {
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
25 CanExecuteChanged(this, new EventArgs());
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
26 }
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
27
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
28
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
29 public bool CanExecute(object parameter)
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
30 {
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
31 return _canExecute == null || _canExecute(parameter);
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
32 }
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
33
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
34
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
35 public void Execute(object parameter)
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
36 {
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
37 _execute(parameter);
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
38 }
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
39 }
a0bcd783e612 Latest work
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
40 }