Re: modifier-flags with no key pressed and mouseDown 256, why?
Re: modifier-flags with no key pressed and mouseDown 256, why?
- Subject: Re: modifier-flags with no key pressed and mouseDown 256, why?
- From: Shawn Erickson <email@hidden>
- Date: Fri, 16 Jan 2009 15:47:34 -0800
On Fri, Jan 16, 2009 at 2:29 PM, Shawn Erickson <email@hidden> wrote:
> On Fri, Jan 16, 2009 at 1:15 PM, Dave DeLong <email@hidden> wrote:
>> My understanding is that the modifierFlag "256" means that no other
>> modifiers are pressed. I haven't found it in the docs anywhere, but I
>> believe that you can count on "256" meaning "no flags". Every machine I've
>> tested this on (I've done a bunch of CGEvent stuff recently) seems to agree.
>
> Unsafe assumption. You are just lucky that some lower bit (device
> dependent bit) is being set for you. I know of no documentation that
> says this bit will always set. Additionally if some other device
> dependent bit is set your assumption would be broken.
As a follow up you are depending on kCGEventFlagMaskNonCoalesced being
set if you are checking against a numeric value of 256. IIRC this will
not be set for events coming from event sources created with
kCGEventSourceStatePrivate and possibly other avenues.
-Shawn
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