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- (NSEdgeInsets)alignmentRectInsets {
    return NSEdgeInsetsMake(0, self.blurRadius, self.blurOffset + self.blurRadius, self.blurRadius);
}

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- (NSSize)intrinsicContentSize {
	return NSMakeSize(self.circleDiameter, self.circleDiameter);
}

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- (void)drawRect:(NSRect)dirtyRect {
    CGFloat blurRadius = self.blurRadius;
    NSSize shadowOffset = NSMakeSize(0, -self.blurOffset);
    NSImage *circularImage = [self.image maskedCircularImageWithDiameter:self.circleDiameter];
    
    NSRect rect = NSMakeRect(blurRadius, blurRadius + self.blurOffset, circularImage.size.width, circularImage.size.height);
    
    NSShadow *shadow = [NSShadow new];
    shadow.shadowBlurRadius = blurRadius;
    shadow.shadowOffset = shadowOffset;

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[optionalTextField setContentCompressionResistancePriority:NSLayoutPriorityDefaultLow forOrientation:NSLayoutConstraintOrientationHorizontal];

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[requiredTextField setContentHuggingPriority:NSLayoutPriorityRequired forOrientation:NSLayoutConstraintOrientationHorizontal];

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[avatarView setContentHuggingPriority:NSLayoutPriorityRequired forOrientation:NSLayoutConstraintOrientationVertical];
[avatarView setContentHuggingPriority:NSLayoutPriorityRequired forOrientation:NSLayoutConstraintOrientationHorizontal];

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[self.window.contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"|-[avatarView]-[optionalTextField]-[requiredTextField]-|" options:NSLayoutFormatAlignAllBottom metrics:nil views:views]];
[self.window.contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-[avatarView]-|" options:0 metrics:nil views:views]];

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// Re: https://twitter.com/iKenndac/status/430813574538092544

// `array` is an array of `SomeClass` objects, which have a `loaded` property
NSArray *loadedSignals = [[array.rac_sequence
    map:^RACSignal *(SomeClass *object) {
        return RACObserve(object, loaded);
    }] array];

[[[[RACSignal
    combineLatest:loadedSignals]

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This is a test gist.