Mercurial > silverbladetech

annotate delete me/SilverlightValidation/Commands/RelayCommand.cs @ 81:4ea16a799a03

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
upload ready after tidy up
author Steven Hollidge <stevenhollidge@hotmail.com>
date Mon, 23 Apr 2012 23:20:01 +0100
parents 3591c26bd63e
children
rev   line source
59
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
1 using System;
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
2 using System.Windows.Input;
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
3
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
4 namespace SilverlightValidation.Commands
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
5 {
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
6 public class RelayCommand : ICommand
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
7 {
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
8 public event EventHandler CanExecuteChanged = delegate { };
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
9
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
10 readonly Action<object> _execute;
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
11 readonly Predicate<object> _canExecute;
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
12
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
13 public RelayCommand(Action<object> execute,
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
14 Predicate<object> canExecute = null)
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
15 {
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
16 if (execute == null) throw new ArgumentNullException("execute");
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
17
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
18 _execute = execute;
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
19 _canExecute = canExecute;
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
20 }
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
21
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
22
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
23 public void UpdateCanExecuteCommand()
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
24 {
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
25 CanExecuteChanged(this, new EventArgs());
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
26 }
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
27
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
28
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
29 public bool CanExecute(object parameter)
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
30 {
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
31 return _canExecute == null || _canExecute(parameter);
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
32 }
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
33
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
34
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
35 public void Execute(object parameter)
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
36 {
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
37 _execute(parameter);
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
38 }
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
39 }
3591c26bd63e MVVMLight added
Steven Hollidge <stevenhollidge@hotmail.com>
parents:
diff changeset
40 }