Full screen glitch

FROM : Simon Stapleton
DATE : Mon Nov 18 19:26:19 2002

Okeydokey, I've been playing with full screen windows.  All is well,
except...

... I'm getting an exception raised at runtime, as follows:

2002-11-18 18:46:36.358 TestApp[1410] *** -[NSNextStepFrame
contentAlpha]: selector not recognized

This is getting raised during NSDrawWindowBackground(), in the
following code:

    while (dirtyArea = [enumerator nextObject]) {
      NSRect dirtyRect = [[dirtyArea objectForKey:@"NSRect"] rectValue];
      NSDrawWindowBackground(dirtyRect);
      [[dirtyArea objectForKey:@"NSImage"]
dissolveToPoint:dirtyRect.origin fraction:alpha];
    }
    [context flushGraphics];

... where dirtyArea is a dictionary corresponding to an area to redraw
(objects being an NSValue wrapping an NSRect, and a precomposed image
which gets composited into the view).  context, of course, is the
current NSGraphicsContext.

If my window is non-fullscreen, all works well.  Something's obviously
amiss with the full-screen window.  The NSNextStepFrame reference in
the exception tends to imply this, as well.  Looks to me as though the
frame is broken somehow.

FScriptAnywhere tells me that NSNextStepFrame is a direct NSView
subclass, whereas all the other frame classes I can find are subclasses
of NSFrameView (which, of course, responds to contentAlpha)

The window is created as follows, in my window controller:

- (void) setFullScreen: (BOOL) flag {
  if (_fullScreen = flag) {
    int windowLevel = CGShieldingWindowLevel();
    NSRect screenRect = [[NSScreen mainScreen] frame];
    NSWindow * newWindow = [[[NSWindow alloc] initWithContentRect:
screenRect styleMask: NSBorderlessWindowMask backing:
NSBackingStoreBuffered defer: NO screen: [NSScreen mainScreen]]
autorelease];
    id window = [self window];

    [newWindow setContentView: [window contentView]];
    [newWindow setLevel:windowLevel];
    [newWindow setDelegate:self];

    [self setWindow:newWindow];
  }
}

Now, I'm hoping that this can be rectified by doing something when I
construct the window.  Any ideas?

Otherwise I suppose I could implement a category on NSNextStepFrame, no?

The more I think about this, the more it looks like a bug.

Simon
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PGP Key Id : 0x50D0698D
--
Eagles may soar, but weasels don't get sucked into jet engines.
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