Happy New Years & [NSView lockFocus]

FROM : Warwick Hall
DATE : Tue Dec 31 20:51:01 2002

Happy New Years to all.

Question:

I have a NSView subclass (Objective-C) that listens
for mouse enter and exit events. When the mouse enters
I need to create a NSTimer that draws patterns around
the NSView. On exit the NSTimer is invalidated.

The NSTimer calls a message pattern: and this seems to
work. Here is the general code:

// Part of my NSView subclass...
- (void) pattern : (id) userInfo
{
  NSBezierPath* path;

  if(![self lockFocusIfCanDraw])
    return;

  path = [[NSBezierPath alloc] init];

  // Do drawing stuff here, mainly
  // with NSBezierPath moveToPoint
  // and lineToPoint calls...

  [[NSColor redColor] set];
  [path fill];

  [path release];

  [self unlockFocus];
}

And nothing happens to the view.

* I have tested that [self canDraw] returns YES.
* [self lockFocus] does not improve anything.
* using NSLog() calls I know the NSTimer is calling
repeatedly the pattern: message (as it should).

unsure what to do now.

Happy Holies,
wh

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