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Mac Forum / Programming / Mac Programming / August 2005How to flush window in drawRect
I want to flush the window an an [NSView -drawRect] routine. This would be helpful for debugging because I could easily correlate drawing commands with *which* object on the screen they produce (I have draw many similar objects in my present program). But the window's flushing appears to be disabled in drawRect. So what do I do? This would greatly aid debugging. In Carbon I would call QDFlushPortBuffer to do this. Thanks. ________________________________________________________________________ Keith Wiley kwiley@cs.unm.edu http://www.unm.edu/~keithw "Yet mark his perfect self-contentment, and hence learn his lesson, that to be self-contented is to be vile and ignorant, and that to aspire is better than to be blindly and impotently happy." -- Edwin A. Abbott, Flatland ________________________________________________________________________ > I want to flush the window an an [NSView -drawRect] routine. This would > be helpful for debugging because I could easily correlate drawing commands [quoted text clipped - 4 lines] > So what do I do? This would greatly aid debugging. In Carbon I would > call QDFlushPortBuffer to do this. Have you tried running Quartz Debug (found in /Developer/Applications/Performance Tools/)? It not only allows you to enable/disable automatic flushing, but it will show you what area needs to be flushed, etc... Cool. Forgot about that utility. >> I want to flush the window an an [NSView -drawRect] routine. This would >> be helpful for debugging because I could easily correlate drawing commands [quoted text clipped - 10 lines] > It not only allows you to enable/disable automatic flushing, but it will > show you what area needs to be flushed, etc... ________________________________________________________________________ Keith Wiley kwiley@cs.unm.edu http://www.unm.edu/~keithw "Yet mark his perfect self-contentment, and hence learn his lesson, that to be self-contented is to be vile and ignorant, and that to aspire is better than to be blindly and impotently happy." -- Edwin A. Abbott, Flatland ________________________________________________________________________ On 22/08/2005, Keith Wiley wrote in message <Pine.LNX.4.60.0508220822200.24122@callisto.cs.unm.edu>: > I want to flush the window an an [NSView -drawRect] routine. This would > be helpful for debugging because I could easily correlate drawing > commands with *which* object on the screen they produce (I have draw > many similar objects in my present program). But the window's flushing > appears to be disabled in drawRect. in addition to the useful comments on Quartz Debug ... Check the NSWindow's status. Make sure it isn't set to 'buffered'. You can set this status if you define the window in IB but it can be set or modified using Cocoa. If the status is Buffered (which is the default because it's fastest and gives the best look) then no matter when you draw, the commands can be delayed until later. Simon.  SignatureUsing pre-release version of newsreader. Please tell me if it does weird things. >I want to flush the window an an [NSView -drawRect] routine. This would >be helpful for debugging because I could easily correlate drawing commands >with *which* object on the screen they produce (I have draw many similar >objects in my present program). But the window's flushing appears to be >disabled in drawRect. >So what do I do? This would greatly aid debugging. In Carbon I would >call QDFlushPortBuffer to do this. If you just want to see what parts of a window are getting update, use /Developer/Applications/Performance Tools/Quartz Debug. Window flushing isn't disabled in drawrect, it just doesn't happen until your -drawRect: method exits, and the process gets back to the main event loop. -jcr On Thu, 25 Aug 2005 John C. Randolph From wrote: > Window flushing isn't disabled in drawrect, it just doesn't happen until > your -drawRect: method exits, and the process gets back to the main event loop. There is an NSWindow function that asks if flushing is disabled (-isFlushWindowDisabled). When called in drawRect, it returns true. Under most other circumstances it returns false. I think flushing is actually temporarily turned off in drawRect, for whatever reason. ________________________________________________________________________ Keith Wiley kwiley@cs.unm.edu http://www.unm.edu/~keithw "Yet mark his perfect self-contentment, and hence learn his lesson, that to be self-contented is to be vile and ignorant, and that to aspire is better than to be blindly and impotently happy." -- Edwin A. Abbott, Flatland ________________________________________________________________________ >On Thu, 25 Aug 2005 John C. Randolph From wrote: >> Window flushing isn't disabled in drawrect, it just doesn't happen until >> your -drawRect: method exits, and the process gets back to the main event loop. >There is an NSWindow function that asks if flushing is disabled >(-isFlushWindowDisabled). When called in drawRect, it returns true. >Under most other circumstances it returns false. I think flushing is >actually temporarily turned off in drawRect, for whatever reason. Umm... To be precise, it's turned off in the _recursiveDisplayRect... methods. That's not necessarily the only way that your -drawRect: method will be invoked. -jcr On Fri, 26 Aug 2005 John C. Randolph From wrote: >> On Thu, 25 Aug 2005 John C. Randolph From wrote: > [quoted text clipped - 8 lines] > Umm... To be precise, it's turned off in the _recursiveDisplayRect... methods. That's > not necessarily the only way that your -drawRect: method will be invoked. Thanks. The whole buffered window thing, which I grant is fantastic as an end-application feature, is annoying as a debugging feature. At least Quartz degub is there, and on certain occasions flushing the window works...but on others it doesn't and you have to turn on Quartz debug...as stated in my original post to this thread. Oh well, I think I get it. Thanks. ________________________________________________________________________ Keith Wiley kwiley@cs.unm.edu http://www.unm.edu/~keithw "Yet mark his perfect self-contentment, and hence learn his lesson, that to be self-contented is to be vile and ignorant, and that to aspire is better than to be blindly and impotently happy." -- Edwin A. Abbott, Flatland ________________________________________________________________________ |
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