ITButtonCell.m

#import "ITButtonCell.h"

#define GRAY_EXTRA_PAD_H 60.0

@interface ITButtonCell (Private)
- (void)drawGrayRoundedBezelWithFrame:(NSRect)rect inView:(NSView *)controlView;
@end

@implementation ITButtonCell

- (id)init {
	if ((self = [super init])) {
		_subStyle = 0;
	}
	return self;
}

- (void)setBezelStyle:(NSBezelStyle)bezelStyle {
	if (bezelStyle == ITGrayRoundedBezelStyle) {
		_subStyle = bezelStyle;
		bezelStyle = NSRegularSquareBezelStyle;
	} else {
		_subStyle = 0;
	}
	[super setBezelStyle:bezelStyle];
}

- (void)drawWithFrame:(NSRect)rect inView:(NSView *)controlView {
	if (_subStyle == ITGrayRoundedBezelStyle) {
		[self drawGrayRoundedBezelWithFrame:rect inView:controlView];
		if ([self attributedTitle]) {
			NSPoint stringOrigin;
			NSSize stringSize;
			stringSize = [[self attributedTitle] size];
			stringOrigin.x = rect.origin.x + (rect.size.width - stringSize.width) / 2;
			stringOrigin.y = (rect.origin.y + (rect.size.height - stringSize.height) / 2) - 2;
			[controlView lockFocus];
			[[self attributedTitle] drawAtPoint:stringOrigin];
			[controlView unlockFocus];
		} else {
			[super drawInteriorWithFrame:rect inView:controlView];
		}
		[[controlView superview] setNeedsDisplay:YES];
	} else {
		[super drawWithFrame:rect inView:controlView];
	}
}

- (void)drawGrayRoundedBezelWithFrame:(NSRect)rect inView:(NSView *)controlView {
	NSBezierPath *path = [NSBezierPath bezierPath];
	float ch = rect.size.height;
	float cw = rect.size.width;
	float radius = (ch / 2);
	NSPoint pointA = NSMakePoint((ch / 2), 0.0);
	NSPoint pointB = NSMakePoint((cw - (ch / 2)), 0.0);
//	NSPoint pointC = NSMakePoint((cw - (ch / 2)), ch);
	NSPoint pointD = NSMakePoint((ch / 2), ch);
	NSPoint lCtr = NSMakePoint((ch / 2), (ch / 2));
	NSPoint rCtr = NSMakePoint((cw - (ch / 2)), (ch / 2));
	float alpha = 0.45;
	
	[path moveToPoint:pointA];
	[path lineToPoint:pointB];
	[path appendBezierPathWithArcWithCenter:rCtr radius:radius startAngle:270.0 endAngle:90.0];
	[path lineToPoint:pointD];
	[path appendBezierPathWithArcWithCenter:lCtr radius:radius startAngle:90.0 endAngle:270.0];
	
	if ([self isHighlighted]) {
		alpha = 0.60;
	}
	
	[[NSColor colorWithCalibratedWhite:0.15 alpha:alpha] set];
	[path fill];
}

- (BOOL)isOpaque {
	return NO;
}

@end