/*

     File: ApplicationDelegate.m

 Abstract:  A simple application delegate. Initializes the application by registering the custom value transformers with NSValueTransformer and ensures that reasonable default data is presented to the user upon first launch.

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#import <Cocoa/Cocoa.h>

#import "ApplicationDelegate.h"

#import "FahrenheitValueTransformer.h"

#import "CentigradeValueTransformer.h"

#import "RankineValueTransformer.h"

@implementation ApplicationDelegate

+ (void) initialize

{

    // Register our custom value transformers with NSValueTransformer.

    // These names are used in the "Transformer" field of the bindings

    // inspector within IB.    

    [NSValueTransformer setValueTransformer: [[CentigradeValueTransformer new] autorelease]

                                    forName: @"centrigradeFromKelvin"];

    [NSValueTransformer setValueTransformer: [[FahrenheitValueTransformer new] autorelease]

                                    forName: @"fahrenheitFromKelvin"];

    [NSValueTransformer setValueTransformer: [[RankineValueTransformer new] autorelease]

                                    forName: @"rankineFromKelvin"];

}

- (void) applicationWillFinishLaunching:(NSNotification *)aNotification

{

    // Register the Kelvin temperature for boiling water as the "first

    // run" value that will appear in the UI. 

    // Because the Kelvin temperature is stored as the value of the

    // "LastTemperature" key of the Shared Defaults controller,

    // whatever the user entered last will be automatically stored and

    // used upon the next launch of the application. 

    // Note that there is nothing particularly magical about value

    // transformers.  You are free to use them to transform values

    // within your code, as needed.   Since most people recognize

    // 100.00 as the boiling point of water more readily than the

    // kelvin value, the centigrade value transformer is used to

    // convert the centigrade boiling point of water to the kelvin

    // value. 

    NSValueTransformer *centrigradeFromKelvinTransformer = [NSValueTransformer valueTransformerForName:@"centrigradeFromKelvin"];

    NSNumber *kelvinWaterBoilingPoint = [centrigradeFromKelvinTransformer reverseTransformedValue: [NSNumber numberWithDouble:100.00]];

    NSDictionary *registrationDefaults = [NSDictionary dictionaryWithObject: kelvinWaterBoilingPoint

                                                                     forKey: @"LastTemperature"]; 

    [[NSUserDefaults standardUserDefaults] registerDefaults: registrationDefaults];

}

- (void) awakeFromNib

{

    // Programatically bind a value transformer to the rankine value

    // field.  The resulting binding is identical to the bindings

    // configured in Interface Builder for the Centigrade and

    // Fahrenheit fields.   We could also choose to bind a specific

    // instance of a value transformer by using the

    // "NSValueTransformer" option.  This could be used in a situation

    // where the value transformer needs more information than just

    // the value to perform the requested transformation.

    NSDictionary *bindingOptions = [NSDictionary dictionaryWithObject: @"rankineFromKelvin"

                                                               forKey: @"NSValueTransformerName"];

    [rankineTemperatureField bind: @"value"

                         toObject: sharedUserDefaultsController

                      withKeyPath: @"values.LastTemperature"

                          options: bindingOptions];

}

@end