/*

     File: MyDocument.m

 Abstract: A document class to manage a single track object.

  Version: 1.1

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 */

#import "MyDocument.h"

#import "Track.h"

@implementation MyDocument

/*

 standard init method

 creates an instance of Track and sets its volume to 5.0

 */

- (id)init

{

    self = [super init];

    if (self != nil)

    {

        _track = [[Track alloc] init];

        [self.track setVolume:5.0];

    }

    return self;

}

/*

 NSDocument method to initialize the user interface

 */

- (void)windowControllerDidLoadNib:(NSWindowController *)aController

{

    [super windowControllerDidLoadNib:aController];

    [self updateUserInterface];

    // Add any code here that needs to be executed once the windowController has loaded the document's window.

}

/*

 action method to update the track's volume based on the float value of the sender

 */

- (IBAction)updateVolumeFrom:(id)sender

{

    float newVolume = [sender floatValue];

    self.track.volume = newVolume;

    // changed value of track's volume, need to update the user interface

    [self updateUserInterface];

}

/*

 updates the user interface to reflect the track's current volume

 */

- (void)updateUserInterface

{

    [self.slider setFloatValue:self.track.volume];

    [self.textField setFloatValue:self.track.volume];

}

/*

 sets track's volumeto 0

 */

- (IBAction)muteTrack:(id)sender

{

    self.track.volume = 0.0;

    // changed value of track's volume, need to update the user interface

    [self updateUserInterface];

}

/*

 NSDocument method to return the name of the nib file for the document

 */

- (NSString *)windowNibName

{

    return @"MyDocument";

}

#pragma mark - Read and Write

/*

 Insert code here to read your document from the given data of the specified type.

 */

- (BOOL)readFromData:(NSData *)data ofType:(NSString *)typeName error:(NSError **)outError

{

    self.track.volume = *(float *)[data bytes];

    return YES;

}

/*

 Insert code here to write your document to data of the specified type.

*/

- (NSData *)dataOfType:(NSString *)typeName error:(NSError **)outError

{

    float volume = self.track.volume;

    return [NSData dataWithBytes:&volume length:sizeof(float)];

}

@end