init with project files

English.lproj/InfoPlist.strings

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+/* Localized versions of Info.plist keys */
+

SCSwitchButton-Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>English</string>
+	<key>CFBundleExecutable</key>
+	<string>${EXECUTABLE_NAME}</string>
+	<key>CFBundleIconFile</key>
+	<string></string>
+	<key>CFBundleIdentifier</key>
+	<string>com.yourcompany.${PRODUCT_NAME:rfc1034identifier}</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>${PRODUCT_NAME}</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSMinimumSystemVersion</key>
+	<string>${MACOSX_DEPLOYMENT_TARGET}</string>
+	<key>NSMainNibFile</key>
+	<string>MainMenu</string>
+	<key>NSPrincipalClass</key>
+	<string>NSApplication</string>
+</dict>
+</plist>

SCSwitchButton.h

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+//
+//  SCSwitchButton.h
+//  SCSwitchButton
+//
+//  Created by Vincent on 1/7/11.
+//  Copyright 2011 Vincent S. Wang. All rights reserved.
+// 
+
+#import <Cocoa/Cocoa.h>
+
+
+@interface SCSwitchButton : NSButton {
+
+}
+
+@end

SCSwitchButton.m

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+//
+//  SCSwitchButton.m
+//  SCSwitchButton
+//
+//  Created by Vincent on 1/7/11.
+//  Copyright 2011 Vincent S. Wang. All rights reserved.
+//
+
+#import "SCSwitchButton.h"
+#import "SCSwitchButtonCell.h"
+
+@implementation SCSwitchButton
+
++ (void)initialize 
+{
+	[self setCellClass:[SCSwitchButtonCell class]];
+}
+
+- (void)awakeFromNib
+{
+	[[self class] setCellClass:[SCSwitchButtonCell class]];
+}
+
+- (void)keyDown:(NSEvent *)event
+{
+	unichar character = [[event characters] characterAtIndex:0UL];
+	switch (character) 
+	{
+		case NSLeftArrowFunctionKey:
+		case NSRightArrowFunctionKey:
+			//Do nothing (yet). We'll handle this in keyUp:.
+			break;
+		default:
+			[super keyDown:event];
+			break;
+	}
+}
+
+- (void)keyUp:(NSEvent *)event 
+{
+	unichar character = [[event characters] characterAtIndex:0UL];
+	switch (character) 
+	{
+		case NSLeftArrowFunctionKey:
+			switch ([self state]) 
+			{
+				case NSOffState:
+					NSBeep();
+					break;
+				case NSMixedState:
+					[self setState:NSOffState];
+					break;
+				case NSOnState:
+					if ([self allowsMixedState])
+						[self setState:NSMixedState];
+					else
+						[self setState:NSOffState];
+					break;
+			}
+			break;
+		case NSRightArrowFunctionKey:
+			switch ([self state]) 
+			{
+				case NSOffState:
+					if ([self allowsMixedState])
+						[self setState:NSMixedState];
+					else
+						[self setState:NSOnState];
+					break;
+				case NSMixedState:
+					[self setState:NSOnState];
+					break;
+				case NSOnState:
+					NSBeep();
+					break;
+			}
+			break;
+		default:
+			[super keyUp:event];
+			break;
+	}
+}
+
+@end