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How can I set evenHandler in WPF for all windows (whole application)?

How do I set an event handler (for example keydown

) on the whole solution, not just one window?

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5 answers


Register a global event handler in your application class (App.cs), for example:

public partial class App : Application
{
    protected override void OnStartup(StartupEventArgs e)
    {
        base.OnStartup(e);

        EventManager.RegisterClassHandler(typeof(Window), Window.KeyDownEvent, new RoutedEventHandler(Window_KeyDown));
    }

    void Window_KeyDown(object sender, RoutedEventArgs e)
    {
        // your code here
    }
}


This will handle the event KeyDown

for anyone Window

in your application. You can dump e

on KeyEventArgs

to get information about the pressed key.

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How about this:



 public partial class App : Application {
        protected override void OnStartup(StartupEventArgs e) {
            EventManager.RegisterClassHandler(typeof(Window), Window.KeyDownEvent, new RoutedEventHandler(KeyDown));
            base.OnStartup(e);
        }

        void KeyDown(object sender, RoutedEventArgs e) {

        }
    }
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You must use a delegate to bind the event (wherever it is) and a function that you are ready to run when the event jumps.

you can load as many events as you like for your delegate.

MZE.

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Well, KeyDown

will only work in the current window, because you need focus for KeyDown

. What you can do is add a handler to all windows and send another event to those handlers, and then register all the classes you need with this new event.

see the template Observer

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You can not. The fighter logs the event in all windows and passes it to a global function / event or (in case of key change or similar) you use some kind of global "event binding" (like THIS for the keyboard).

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