/*

 File: MyController.m

 Abstract: Main controller class. 

           Loads and manages Carbon and Cocoa windows that allow users to convert Fahrenheit values to Celsius.

           Provides a routine to handle events in the Carbon window.

 Version: 1.1

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 */

#import "MyController.h"

#pragma mark Carbon Methods

/*

    Handles the "Convert" button's events in the Carbon window.

*/

pascal OSStatus CarbonWindowCommandHandler(EventHandlerCallRef handlerRef, EventRef event, void *userData)

{

#pragma unused (handlerRef)

    OSStatus err = eventNotHandledErr;

    HICommand command; 

    GetEventParameter(event, kEventParamDirectObject, typeHICommand, NULL, sizeof(HICommand), NULL, &command);

    /* Calls the ConvertCommandHandler routine if commandID is equal to kConvertCommand */

    switch(command.commandID) {

        case kConvertCommand:

            ConvertCommandHandler((WindowRef) userData);

            err = noErr;

            break;

    }

    return err;

}

/*

    Called when users click the "Convert" button in the Carbon window.

    Takes a number that represents a fahrenheit value, converts it to Celsius, and displays the result.

*/ 

pascal void ConvertCommandHandler(WindowRef window)

{

    ControlHandle fahrenheitField, celsiusField;

    ControlID fahrenheitControlID = { kConvertSignature, kFahrenheitFieldID };

    ControlID celsiusControlID = { kConvertSignature, kCelsiusFieldID };

    CFStringRef text;

    Size actualSize;

    double fahrenheitTemp, celsiusTemp;

    /* Fetch the fahrenheit and celsius textfields in the carbon window */

    GetControlByID(window, &fahrenheitControlID, &fahrenheitField);

    GetControlByID(window, &celsiusControlID, &celsiusField );

    /* Retrieve the content of the fahrenheit textfield */

    GetControlData(fahrenheitField, 0, kControlEditTextCFStringTag, sizeof(CFStringRef), &text, &actualSize);

    /* Get the double value of the retrieved content */

    fahrenheitTemp = CFStringGetDoubleValue(text);

    CFRelease(text);

    /* Convert the fahrenheit value and assign the result to celsiusTemp */

    celsiusTemp = (fahrenheitTemp - 32.0) * 5.0 / 9.0; 

    text = CFStringCreateWithFormat(NULL, NULL, CFSTR("%g"), celsiusTemp);

    /* Set the value of the celsius textfield */

    SetControlData(celsiusField, 0, kControlEditTextCFStringTag, sizeof(CFStringRef), &text);

    CFRelease(text);

    DrawOneControl(celsiusField);

}

@implementation MyController

- (id)init

{

    self = [super init];

    return self;

}

#pragma mark Cocoa Methods

/*

    Called when users click the "Convert" button in the Cocoa window. 

    Takes a number that represents a fahrenheit value, converts it to Celsius, and displays the result.

*/ 

- (IBAction)fahrenheitToCelsius:(id)sender

{

    double fahrenheitTemp, celsiusTemp;

    /* Get the fahrenheit value */

    fahrenheitTemp = [fahrenheitField doubleValue];

    /* Convert it to Celsius */

    celsiusTemp = (fahrenheitTemp - 32.0) * 5.0 / 9.0;

    /* Round and display the result */

    [celsiusField setDoubleValue:celsiusTemp];

}

/*  

    This routine runs whenever the Cocoa object is unpacked from the nib file; it's a good place to do initialization.

*/

-(void)awakeFromNib

{

    CFBundleRef bundleRef;

    IBNibRef nibRef;

    OSStatus err;

    /* The Cocoa nib was loaded for us by default at app launch time.

     But now, we need to explicitly load the Carbon nib and its window. */

    bundleRef = CFBundleGetMainBundle();

    err = CreateNibReferenceWithCFBundle(bundleRef,CFSTR("carbonnib"), &nibRef);

    if (err!=noErr){

        NSLog(@"failed to create carbon nib reference");

    }

    /* Ok, the Carbon nib is loaded, so now we need to load the window from it */

    err = CreateWindowFromNib(nibRef, CFSTR("CarbonWin"), &window);

    if (err != noErr){

        NSLog(@"failed to create carbon window from nib");

    }

    DisposeNibReference(nibRef);

    /* Create a Cocoa window to wrap the Carbon window and make sure events are handled properly,

     since this is a Cocoa app with a main runloop controlled by Cocoa */

    cocoaFromCarbonWin = [[NSWindow alloc] initWithWindowRef:window];

    /* Bring the "Carbon" window to the front */

    [cocoaFromCarbonWin makeKeyAndOrderFront:nil];

    /* Carbon Event handler that listens for command events in the Carbon window */

    InstallWindowEventHandler(window,NewEventHandlerUPP(CarbonWindowCommandHandler),1, &commSpec, (void *) window, NULL);

}

- (void)dealloc

{

    [cocoaFromCarbonWin release];

    [super dealloc];

}

@end