Wpf – Keybindings without any focus

c#-4.0mvvmwpfxaml

I have a WPF screen that has half a dozen buttons. I'd like to associate each with a keybinding. They are all ICommand driven via MVVM.

I currently have the keybindings bound to the events and not the actual buttons:

<UserControl.InputBindings>
        <KeyBinding Key="N"  Command="{Binding MyCommand}"/>

However, for any Keybinding to work I have to set at least 1 button to focus in the codebehind. I'd really like to not do this because each button/command has different rules on if it's active or not and I have focus animation that I'd prefer wasn't active on page load.

Is this possible or do I have to set focus?

Best Answer

You just need to set usercontrol's focusable to true, because some element doesn't have it to true by default

<UserControl Focusable="True">

Then you have to set this.Focus() in the loaded event of the user control

Related Solutions

C# – How should the ViewModel close the form

I was inspired by Thejuan's answer to write a simpler attached property. No styles, no triggers; instead, you can just do this:

<Window ...
        xmlns:xc="clr-namespace:ExCastle.Wpf"
        xc:DialogCloser.DialogResult="{Binding DialogResult}">

This is almost as clean as if the WPF team had gotten it right and made DialogResult a dependency property in the first place. Just put a bool? DialogResult property on your ViewModel and implement INotifyPropertyChanged, and voilà, your ViewModel can close the Window (and set its DialogResult) just by setting a property. MVVM as it should be.

Here's the code for DialogCloser:

using System.Windows;

namespace ExCastle.Wpf
{
    public static class DialogCloser
    {
        public static readonly DependencyProperty DialogResultProperty =
            DependencyProperty.RegisterAttached(
                "DialogResult",
                typeof(bool?),
                typeof(DialogCloser),
                new PropertyMetadata(DialogResultChanged));

        private static void DialogResultChanged(
            DependencyObject d,
            DependencyPropertyChangedEventArgs e)
        {
            var window = d as Window;
            if (window != null)
                window.DialogResult = e.NewValue as bool?;
        }
        public static void SetDialogResult(Window target, bool? value)
        {
            target.SetValue(DialogResultProperty, value);
        }
    }
}

I've also posted this on my blog.

Wpf – TextBox and default Button binding does update too late

Add the UpdateSourceTrigger to your TextBox with the value PropertyChanged. The default behavior of the Textbox is to update the source, when it´s lost focus.

<TextBox Text="{Binding MyText, UpdateSourceTrigger=PropertyChanged}"/>

Best Answer

Related Solutions

C# – How should the ViewModel close the form

Wpf – TextBox and default Button binding does update too late

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