Find first text field/view, make first responder

gistfile1.txt

- (BOOL)makeFirstTextInputSubviewKeyView {
	NSWindow *theWindow = [self window];
	if ([theWindow isVisible]) {
		NSArray *theTopLevelSubviews = [self subviews];
		if ([theTopLevelSubviews count]>0) {
			Class theTextFieldClass = [NSTextField class];
			Class theTextViewClass = [NSTextView class];
			NSMutableArray *theTextInputSubviews = [NSMutableArray array];
			__block void (^PMCollectTextInputSubviews)(NSArray *) = ^(NSArray *theSubviews) {
				for (NSView *aSubview in theSubviews) {
					if (![aSubview isHidden]) {
						if (([aSubview isKindOfClass: theTextFieldClass] || [aSubview isKindOfClass: theTextViewClass]) && [aSubview canBecomeKeyView]) {
							[theTextInputSubviews addObject: aSubview];
						}
						PMCollectTextInputSubviews([aSubview subviews]);
					}
				}
			};
			PMCollectTextInputSubviews(theTopLevelSubviews);
			NSUInteger theNumberOfTextInputSubviews = [theTextInputSubviews count];
			if (theNumberOfTextInputSubviews>0) {
				if (theNumberOfTextInputSubviews>1) {
					BOOL isRightToLeftLayout = ([self userInterfaceLayoutDirection]==NSUserInterfaceLayoutDirectionRightToLeft);
					[theTextInputSubviews sortUsingComparator: ^(NSView *theFirstView, NSView *theSecondView) {
						NSPoint theFirstOrigin = [theFirstView convertRect: [theFirstView bounds] toView: nil].origin;
						NSPoint theSecondOrigin = [theSecondView convertRect: [theSecondView bounds] toView: nil].origin;
						CGFloat aDelta = theFirstOrigin.y - theSecondOrigin.y;
						if (aDelta>0.1) {
							return NSOrderedAscending;
						}
						if (aDelta<-0.1) {
							return NSOrderedDescending;
						}
						aDelta = (isRightToLeftLayout ? theFirstOrigin.x - theSecondOrigin.x : theSecondOrigin.x - theFirstOrigin.x);
						if (aDelta>0.1) {
							return NSOrderedAscending;
						}
						if (aDelta<-0.1) {
							return NSOrderedDescending;
						}
						return NSOrderedSame;
					}];
				}
				return [theWindow makeFirstResponder: [theTextInputSubviews objectAtIndex: 0]];
			}
		}
	}
	return NO;
}