One Quickie

Finding the height of the title bar (NSWindow->General)
When you setFrame: for a window, you have to account for the height of the title bar. In the Classic days it was 16 pixels. In Aqua-land, it's currently 22 pixels. But that's not safe to use, so try this instead:
- (float) titleBarHeight
    NSRect frame = NSMakeRect (0, 0, 100, 100);

    NSRect contentRect;
    contentRect = [NSWindow contentRectForFrameRect: frame
                            styleMask: NSTitledWindowMask];

    return (frame.size.height - contentRect.size.height);

} // titleBarHeight
Rainer Brockerhoff points out that this might miss any system-suppled window decorations at the bottom of the window. There aren't any now, but Mac OS X 10.37 Sabertooth might, so you may want to take into account the y positions of the original rectangle and the newly calculated content rect.

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