TicTacToe/AAPLTicTacToeCircleButtonView.m

/*
 
 Copyright (C) 2014 Apple Inc. All Rights Reserved.
 See LICENSE.txt for this sample’s licensing information
 
 Abstract:
 NSButton subclass demonstrating accessibility provided by AppKit.
 
 */
 
#import "AAPLTicTacToeCircleButtonView.h"
 
@interface AAPLTicTacToeCircleButtonView ()
 
@property (nonatomic) BOOL depressed;
 
@end
 
@implementation AAPLTicTacToeCircleButtonView
 
- (instancetype)initWithFrame:(NSRect)frame
{
    self = [super initWithFrame:frame];
 
    if ( self != nil )
    {
        _lineWidth = 2.0;
        _color = [NSColor blackColor];
        _backgroundColor = [NSColor lightGrayColor];
        _backgroundDepressedColor = [NSColor grayColor];
        _inset = self.bounds.size.width / 10.0;
    }
 
    return self;
}
 
- (void)mouseDown:(NSEvent *)mouseEvent
{
    [super mouseDown:mouseEvent];
 
    self.depressed = YES;
    [self setNeedsDisplay:YES];
}
 
- (void)mouseUp:(NSEvent *)mouseEvent
{
    [super mouseUp:mouseEvent];
 
    self.depressed = NO;
    [self setNeedsDisplay:YES];
}
 
- (NSPoint)centerPoint
{
    return NSMakePoint(NSMidX(self.bounds), NSMidY(self.bounds));
}
 
- (CGFloat)radius
{
    return self.bounds.size.width / 2.0 - self.inset;
}
 
- (void)drawRect:(NSRect)dirtyRect
{
    [NSBezierPath setDefaultLineWidth:self.lineWidth];
    NSBezierPath *circlePath = [[NSBezierPath alloc] init];
    [circlePath appendBezierPathWithArcWithCenter:self.centerPoint
                                           radius:self.radius
                                       startAngle:0.0
                                         endAngle:360.0];
    if ( self.depressed )
    {
        [self.backgroundDepressedColor set];
    }
    else
    {
        [self.backgroundColor set];
    }
 
    [circlePath fill];
 
    [self.color set];
    [circlePath stroke];
 
    // Draw the focus ring
    BOOL isFirstResponder = [[[NSApp mainWindow] firstResponder] isEqual:self];
    if ( isFirstResponder )
    {
        [NSGraphicsContext saveGraphicsState];
        NSSetFocusRingStyle(NSFocusRingOnly);
        [circlePath fill];
        [NSGraphicsContext restoreGraphicsState];
    }
}
 
@end