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how to get key events after loosing the focus ?

naved momin
Ranch Hand

Joined: Jul 03, 2011
Posts: 692

how an app can get key events even though when it doesn't have focus in java ?


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Martin Vajsar
Sheriff

Joined: Aug 22, 2010
Posts: 3610
    
  60

As far as I know, such functionality is not provided by Java. It is usually provided somehow at the OS level, so it is inevitably OS specific. In Windows, you can register either a keyboard hook (to get all keystrokes), or a shortcut key (to get one specific keystroke). The former needs a callback routine placed in a DLL, the latter needs a window handle to send messages to, so you'd need some JNI/JNA wizardry to make it work. And this is only Windows, in other OSes, you'd need to implement another handling.
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: how to get key events after loosing the focus ?