/*

     File: Controller.m

 Abstract:  Simple NSUserDefaults example program that reads/writes a preference and shows how to make a window's position and size persistent.

  Version: 1.2

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 */

#import "Controller.h"

@implementation Controller

#define defaultValue @"Default"

#define myKey @"My String"

/* Called when the app has finished launching and is ready to start running.

   This happens because in IB the delegate of the app is set to be this object.

*/

- (void)applicationDidFinishLaunching:(NSNotification *)notification {

    // One of the things we do is to read the last value recorded from userdefaults

    // and set that as the value of the textfield. We have a handle to the textfield

    // (myTextField) because it is set up as an outlet in InterfaceBuilder.

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

    NSString *val = [defaults stringForKey:myKey];

    if (val == nil) val = defaultValue;

    [myTextField setStringValue:val];

    // Another thing we do is make the location of the default window also

    // get stored in defaults. This is handled simply handled by telling the window

    // what key to look for, and everything else is automatic!

    [myWindow setFrameAutosaveName:@"My Window"];

    // Now show the window... (By default we've set it in IB not to be visible at start)

    [myWindow makeKeyAndOrderFront:nil];

}

/* This method is called when a new value is entered into the textfield.

*/

- (void)textFieldAction:(id)sender {

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

    NSString *val;

    // Get the new value from the textfield

    val = [myTextField stringValue];

    // If it's the default value, remove from preferences; otherwise set the new value

    // We don't need to do this, but it keeps preferences cleaner, and the default value

    // is more implicit this way (in case it ever changes, the old default value won't

    // have been hardwired).

    if ([val isEqualToString:defaultValue]) {

        [defaults removeObjectForKey:myKey];

    } else {

        [defaults setObject:val forKey:myKey];

    }

    // Note that we don't synchronize with the file system or anything; this will happen

    // when the app quits. There are times when an explicit synchronize might be necessary,

    // but often it's not. Synchronizing unecessarily can also be a performance issue.

}

@end