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Performing an action (Command) after pressing the Enter key in a WPF TextBox

Thu, 12/17/2009 - 00:43 — Giorgio Galante

Unfortunately the out-of-the-box implementation of WPF’s TextBox control has no built-in way to execute a ‘default’ ICommand action when the Enter key is pressed.  I took a first stab at this for my current client, and here is a rewritten/improved implementation of a “Commandable” TextBox:

/* Copyright (c) 2009 Giorgio Galante. 
 * Released under the MIT License (http://en.wikipedia.org/wiki/MIT_License)
 */
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Input;

namespace WPFControls
{
    public class CommandableTextBox : TextBox
    {
        public static readonly DependencyProperty
            CommandProperty = DependencyProperty.Register(
                "Command",
                typeof (ICommand),
                typeof (CommandableTextBox),
                new UIPropertyMetadata(null));

        public static DependencyProperty CommandParameterProperty =
            DependencyProperty.Register(
                "CommandParameter",
                typeof (object),
                typeof (CommandableTextBox),
                null);

        public CommandableTextBox()
        {
            KeyUp += KeyUpAction;
        }

        public ICommand Command
        {
            get { return (ICommand) GetValue(CommandProperty); }
            set { SetValue(CommandProperty, value); }
        }

        public object CommandParameter
        {
            get { return GetValue(CommandParameterProperty); }

            set { SetValue(CommandParameterProperty, value); }
        }

        private void KeyUpAction(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Enter)
            {
                if (Command != null)
                {
                    BindingExpression be = GetBindingExpression(TextProperty);
                    if (be != null)
                    {
                        be.UpdateSource();
                    }
                    Command.Execute(CommandParameter);
                }
            }
        }
    }
}


Comments

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Thu, 02/04/2010 - 06:01 — Anonymous

Thank you! But maybe we

Thank you!

But maybe we should check command before executing?

private void KeyUpAction(object sender, KeyEventArgs e)
{
....

if (Command.CanExecute(CommandParameter))
{
Command.Execute(CommandParameter);
}
....
}

Wed, 02/10/2010 - 09:39 — Giorgio Galante

Re: Thank you! But maybe we

Great idea ;-) I'll update this post/attachment a bit later to reflect the check...

Thanks!

Thu, 07/08/2010 - 05:11 — Anonymous

Nice work

Thanks! //Peter