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Re: Disabling key bindings
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Re: Disabling key bindings


  • Subject: Re: Disabling key bindings
  • From: Ken Thomases <email@hidden>
  • Date: Thu, 5 Mar 2009 14:29:04 -0600

On Mar 5, 2009, at 2:18 PM, Shayne Wissler wrote:

On Thu, Mar 5, 2009 at 12:17 PM, Ken Thomases <email@hidden> wrote:

On Mar 5, 2009, at 11:59 AM, Shayne Wissler wrote:

I have an application in which the user's normal OSX key bindings are
meaningless, and while they are in that application I would like to detect
any keyboard event. Right now I am using KeyDown, KeyUp, and FlagsChanged,
but these of course are subject to the user's key bindings.



No, they're not. These deal in raw keyboard events.


So why don't I get events for F1-F4, F7-12? I was assuming it was because
they were bound, evidently there's a different level of key binding going
on?

I suspect you would if you used the "fn" key with them. In System Preferences, Keyboard & Mouse pane, Keyboard tab, take a look at the "Use all F1, F2, etc. keys as standard function keys" checkbox. Unless that is checked, the function keys you refer to are acting as "hardware" keys.


This is not part of the Cocoa key bindings technology. It's happening at a lower level than that. You can check to see if a Quartz Event Tap gives you access to those key events, but even that might not.

Another thing to be aware of is the Keyboard Shortcuts tab of that preference pane. Shortcuts assigned there are also not part of the Cocoa key bindings system, but you do have some more control over them. If you override -[NSApplication sendEvent:] you can see those key events and even prevent their normal processing.


See <http://developer.apple.com/documentation/Cocoa/Conceptual/EventOverview/HandlingKeyEvents/chapter_6_section_3.html >.

Thanks for the link.

You're welcome.

Cheers,
Ken

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  • Follow-Ups:
    • Re: Disabling key bindings
      • From: Shayne Wissler <email@hidden>
References: 
 >Disabling key bindings (From: Shayne Wissler <email@hidden>)
 >Re: Disabling key bindings (From: Ken Thomases <email@hidden>)
 >Re: Disabling key bindings (From: Shayne Wissler <email@hidden>)

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