Global Keyup event handler

[Superfly1611]

Hi all,

 

I'm in the process of writing my first application for the compact framework.

 

I need to write an event handler that handles all keyup events. Now obviously I could simply override the OnKeyUp event of the form, which is something I have tried with limited success.

 

Whenever another control on the form has the focus the keyup event handler will obviously not fire.

 

I would have thought that this would be a common problem, I did a few searches on msdn but it didn't come up with anything that looked quite like what I was looking for.

 

Is there a solution to this?

[Superfly1611]

Ok I have a working solution, however I am very interested to see if you guys think this was the right way to do it because I must confess this is a very new area for me.

 

At run time I recurse through each control on my form and assign the keyup event of that control an event handler like so:

       void AssignHandlers(Control container)
       {
           foreach (Control ctrl in container.Controls)
           {
               ctrl.KeyUp += new KeyEventHandler(Handle_KeyUp);
               AssignEventHandlers(ctrl);
           }
       }

       void Handle_KeyUp(object sender, KeyEventArgs e)
       {
           switch (e.KeyData)
           {
               case Keys.Down:
                   //do stuff;
                   break;
           }
       }

 

Any comments (good or bad) you have on how I've achieved this would be greatly appreciated.

 

Many Thanks

[IceAzul]

Set the forms .KeyPreview to true.

[Superfly1611]

Set the forms .KeyPreview to true.

Hey thanks for answering, unfortunately I cannot use the KeyPreview property of the form because I'm using the compact framework and I don't seem to have that option available to me.

 

I think my solution is the best way of doing this but if someone has another way of doing this I'm all ears :)

[IceAzul]

Hmm, you must be using 1.0 of the cf. Version 2.0 supports Keypreview and many other nice things, so if it is an option, you should consider switching.

[Superfly1611]

yeah i'm using 1.0, unfortunately switching to 2.0 isn't an option which is annoying to say the least (especially because I started developing on that platform!).

[snarfblam]

If you are stuck with version 1.0 then I would say that you are using the right approach.

[IceAzul]

You might want to consider this article about intercepting messages.