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c#wpfxamlmvvm
Kaddy
Kaddy

Reputation: 1266

Key binding wpf mvvm

I am using the following tag in my xaml to bind the enter key to a command.

<KeyBinding Command="{Binding EnterKeyCommand}" Key="Enter" />

But if i press the enter key 5 times (very quickly) the command is called 5 times. How can i prevent this?

Upvotes: 0

Views: 1031

Answers (2)

Toby Crawford
Toby Crawford

Reputation: 827

If you wanted to add a delay between the Command executing for a first time and it being able to be executed again, you can just set canExecute to false for a period of time:

public class EnterKeyCommand : ICommand
{
    private bool canExecute;

    public EnterKeyCommand()
    {
        this.canExecute = true;
    }

    public bool CanExecute(object parameter)
    {
        return this.canExecute;
    }

    public void Execute(object parameter)
    {
        this.canExecute = false;
        Debug.WriteLine("Running Command");

        var timer = new DispatcherTimer { Interval = TimeSpan.FromSeconds(5) };
        timer.Tick += (sender, args) =>
            {
                this.canExecute = true;
                timer.Stop();
            };
        timer.Start();
    }

    public event EventHandler CanExecuteChanged;
}

Upvotes: 2

Alex
Alex

Reputation: 13224

Assuming that EnterKeyCommand is an ICommand, set its ICommand.CanExecute to false when it is invoked, and back to true when it is ok to execute it again (raising ICommand.CanExecuteChanged both times).

Upvotes: 2

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