Chris,
I think you'll need to put some Carbon in your Cocoa to get what you
want.
If you need to get that information systemwide (ie. when you're in the
background too), you can use Carbon's GetCurrentButtonState() for the
mouse and maybe Carbon HotKey APIs for the keypresses. You can
register the hot key handlers from your Cocoa app, and there are even
some tutorials that come up in Google.
Hotkeys are only going to give you the key presses you register for,
though... If you need to get notified when *any* key is pressed system-
wide, I don't think you can handle that from within the app itself.
I'd expect you'd need to write a helper to notify your app. Someone
else may know better.
- d
On Mar 9, 2008, at 1:20 AM, Christopher Kempke wrote:
I'm working on some code for a client, whose users (handicapped
children, mainly) are using non-standard mousing devices. These
are (often literally) single-switch input devices: there's no
notion of position with them at all, basically just a mouse button
sans actual mouse. (On-screen position is obtained by a variety of
complicated mechanisms, including simple scanning, where the user
pushes/blinks/speaks/blows into a tube/whatever at the appropriate
time, the exact input being dependent on their capabilities.
Pretty much all of these devices just turn the "input," whatever it
is, into a mouse click or keypress).
A fairly common problem that comes up is simply knowing if the mouse
button is down or not. I'm looking for the Cocoa equivalent of
the deprecated QuickDraw "Button()" function -- just tell me whether
(a particular or even just any) mouse button is currently pressed or
not.
Mousedown handlers don't seem to be doing it for me, because I don't
know what to put them on: I need to know whether the mouse is down
regardless of modality, what window's in front, where the cursor is,
and even whether or not the mouse is in one of my app's windows at
all. I could live with keeping track of every mouse down and up,
so long as there's a way to do it globally (even while in the
background).
I'm guessing this has come up before, but searching for "Button()"
isn't helping. Any hints? I'll eventually need the same thing
for keystrokes (the equivalent of deprecated GetKeys()), too, so I'd
take hints there, as well.
--Chris
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