禁用与 UWP 应用程序的键盘交互

Question

I am building a UWP application and I wish to disable the keyboard interaction with my application. This means my app should not in any way respond when any key on the keyboard is pressed.

Is this achievable? Can I selectively disable interaction with some keys like the Tab key etc.

Answer 1

Yes, you can use the KeyboardDeliveryInterceptor class for this. Couple of things to note with this:

1. You will need to declare restricted capability 'inputForegroundObservation' in your appxmanifest file:

<Capabilities>
  <Capability Name="internetClient" />
  <rescap:Capability xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities" Name="inputForegroundObservation"/>
</Capabilities>

2. You cannot intercept keys selectively, but you can respond to particular intercepted keys in your code and respond with the desired action (eg move focus when the tab key is pressed):

KeyboardDeliveryInterceptor interceptor = KeyboardDeliveryInterceptor.GetForCurrentView();
interceptor.IsInterceptionEnabledWhenInForeground = true;
interceptor.KeyUp += delegate(KeyboardDeliveryInterceptor sender, KeyEventArgs args)
{
    if (args.VirtualKey == Windows.System.VirtualKey.Tab)
    {
        // perform desired tab key action
    }
};

Answer 2

<Capabilities>
     <Capability Name="internetClient" />
     <rescap:Capability xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities" Name="inputForegroundObservation"/>
</Capabilities>

Add permission as Stefan said above. After you add permission add below code.

Dispatcher.AcceleratorKeyActivated += Dispatcher_AcceleratorKeyActivated;

private void Dispatcher_AcceleratorKeyActivated(CoreDispatcher sender, AcceleratorKeyEventArgs args)
    {
        if(args.key == Windows.System.VirtualKey.Tab)
        {
           args.Handled = true;
        }
    }

The above code prevents the Tab button to perform any action. Hence, When the user presses Tab key no action will be performed.