/*

     File: HelloController.m 

 Abstract: The class that handles the interaction between the GUI and the Hello objects,

 allowing you to switch messages and receiver objects. 

  Version: 1.5 

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 */

// we use #import to make sure the header is only read in once

#import "HelloController.h"

@implementation HelloController

// This method is called when the user picks a different message 

// to display by clicking a different radio button

- (IBAction)switchMessage:(id)sender

{

    // sender is the NSMatrix containing the radio buttons.

    // We ask the sender for which row (radio button) is selected and add one

    // to compensate for counting from zero.

    int which = [sender selectedRow] + 1;

    // We now set our NSButton's action to be the message corresponding to the radio button selection.

    // +[NSString stringWithFormat:...] is used to concatenate "message" and the message number.  

    // NSSelectorFromString converts the message name string to an actual message structure that

    // Objective-C can use.

    [helloButton setAction:NSSelectorFromString([NSString stringWithFormat:@"%@%d:", @"message", which])];        

}

// This method is called when the user picks a different object to 

// receive messages using the PopUp menu

- (IBAction)switchObject:(id)sender

{

    // sender is the NSPopUpMenu containing Hello object choices.

    // We ask the sender for which menu item is selected and add one

    // to compensate for counting from zero.

    int which = [sender indexOfSelectedItem] + 1;

    // Based on which menu item is selected, we set the target (the receiving object)

    // of the helloButton to point to either hello1 or hello2.

    if (which == 1)

        [helloButton setTarget:hello1];

    else

        [helloButton setTarget:hello2];

}

// awakeFromNib is called when this object is done being unpacked from the nib file;

// at this point, we can do any needed initialization before turning app control over to the user

- (void)awakeFromNib

{

    // We don't actually need to do anything here, so it's empty

}

// Handling the Help menu:

// -----------------------

// It used to be that we had a routine here that opened our ReadMe.html help file using Help Viewer via

// NSWorkspace's -openFile:withApplication:, but now we do things the "modern" way.  This means that we

// let Cocoa handle things automatically for us.  The only thing we need is a folder containing our help

// files that sits in the Resources folder inside the SimpleCocoaApp bundle, a new meta tag in our help title

// page (the "AppleTitle" tag), and a few Info.plist keys (see the "Expert" view of Targets -> Application Settings).

// The two Info.plist keys needed are CFBundleHelpBookFolder and CFBundleHelpBookName.  Once that is done,

// Help Viewer will automatically open the Help page when the Help menu item is selected, etc.  No code is needed!

@end