[Pyobjc-dev] textview scrolling

[Joshua K. <jo...@ro...>]

Interesting one for ya.  I've got a NSTextView that I'm trying to 
scroll to the bottom programatically, and it works, but its hokey.  The 
situation is I've got a separate thread throwing data into a queue.  
Now to access this data from the main (Cocoa) thread, I have and 
NSTimer set up to poll that queue.  Here's the routine:

     def checkOutput(self, sender):
         y = self.outputView.frame().size.height
         self.outputView.scrollPoint_(NSPoint(0,y))
         try:
             while 1:
                 message = self.queue.get(0)
                 txt = NSAttributedString.alloc().initWithString_(
                     message.data)
                 
self.outputView.textStorage().appendAttributedString_(txt)
         except:
             pass

The issue I was having is that if I try to scroll immediately after 
appending the string to the text storage object, it doesn't update the 
geometry of the view.  I assume the view will not update its geometry 
until it gets its own time after this function exits.  So you see, this 
function works, but there is a small lag due to the fact that this 
function is called every 0.1 seconds.

Any suggestions for a better way to handle this?