On Fri, 9 Mar 2007 11:07:43, John Stiles <email@hidden> wrote:
> On Mar 9, 2007, at 10:49 AM, Matthew Douglass wrote:
>
>>> My goal is to get a notification when the mouse leaves my window content
>>> region (in 10.3+). I saw kEventMouseExited and decided to try to use that.
>>> I added a call to CreateMouseTrackingRegion, passing in the region returned
>>> by GetWindowRegion(kWindowContentRegion) and
>>> kMouseTrackingOptionsGlobalClip. But even after realizing I needed to call
>>> SetMouseTrackingRegionEnabled(true), I still never get any events.
>>>
>>> As an experiment, I created a Rect slightly smaller than the size of my
>>> window (about 10 pixels on each side) and passed that in to
>>> CreateMouseTrackingRegion with kMouseTrackingOptionsLocalClip. After doing
>>> that I started to get kEventMouseExited events. However, I noticed that if
>>> I moved the mouse very quickly (fast enough that I don't get mouse moved
>>> events inside that 10 pixel boundary), then I don't get kEventMouseExited.
>>>
>>> So I need some way to get a notification when the mouse is leaving the
>>> content region of my window - what other options are there?
>>
>> So why is it inevitable that I always send these emails and then
>> have a brainstorm. I realized I could catch kEventMouseMoved at
>> the application level and then just check if kEventParamWindowRef
>> is my window or not.
>
> That will work, but it will be a firehose of events :)
Unless mouse moved events are sent with kEventTargetSendToAllHandlers
option (which I believe is not the case, otherwise it would be mentioned
in the CarbonEvents.h), the mouse moved handler installed on a particular
window might interrupt the event flow by means of returning noErr from
the handler. Won't that be a problem? I haven't tried using event dispatcher
target in this context but maybe it's more appropriate.
>> Sorry for the noise,
Good question, actually. BTW, future versions of Mac OS might deprecate
MouseTrackingRegions in favor of HIView-based tracking areas.
Mike
[Available for hire. Resume on request.]
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