Re: Preventing a NSTextView from drawing
Re: Preventing a NSTextView from drawing
- Subject: Re: Preventing a NSTextView from drawing
- From: Michael Latta <email@hidden>
- Date: Mon, 30 Dec 2002 10:03:57 -0800
I would take the text out of the messages into a queue. Then trigger a
timer to update the display. This way the screen update is done when
the event loop is idle, and there is not problem completing the message
passing.
But the bigger problem you have is 2 threads trying to output to the
same context. You will need to test the lock availability before
trying to update the text, then force a display before releasing the
lock.
Is there any way you can place the OpenGL in a separate borderless
window that happens to overlap your other window that has the text in
it? That would give you separate contexts. It will mean managing the
window levels and the like, but it might be much easier.
Michael
On Monday, December 30, 2002, at 09:44 AM, Pierre-Olivier Latour wrote:
Hi,
Is there a way to prevent a NSTextView to redraw itself or mark itself
as
reneeding display when you modify its text? I want need to delay its
redrawing actually and call myself [view display];
I tried calling [view setNeedsUpdate:NO] just after editing the text
but it
doesn't work.
I know I could probably subclass the text view and patch
setNeedsDisplay,
but I was wondering if there is already a clean way to achieve my goal.
More about my problem:
I have a secondary thread which does OpenGL drawing in my app and
sometimes
it sends text messages to the main thread through a NSPortMessage.
The main thread gets the message and appends it to a NSTextView.
The problem is that sometimes, if too many messages arrive, some can't
be
delivered because in the OpenGL thread, the OpenGL view has been focus
locked and the main thread can't acquire focus on the NSTextView. So
it's
waiting for the lock and does not respond to HandlePortMessage
_____________________________________________________________
Pierre-Olivier Latour email@hidden
Palo Alto, USA http://www.pol-online.net
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