/*

Copyright (C) 2016 Apple Inc. All Rights Reserved.

See LICENSE.txt for this sample’s licensing information

*/

#import <Cocoa/Cocoa.h>

#import <AudioUnit/AudioUnit.h>

#import <AudioToolbox/AudioToolbox.h>

#import "AppleDemoFilter_GraphView.h"

#import "Filter.h"

/************************************************************************************************************/

/* NOTE: It is important to rename ALL ui classes when using the XCode Audio Unit with Cocoa View template  */

/*       Cocoa has a flat namespace, and if you use the default filenames, it is possible that you will     */

/*       get a namespace collision with classes from the cocoa view of a previously loaded audio unit.      */

/*       We recommend that you use a unique prefix that includes the manufacturer name and unit name on     */

/*       all objective-C source files. You may use an underscore in your name, but please refrain from      */

/*       starting your class name with an undescore as these names are reserved for Apple.                  */

/************************************************************************************************************/

@interface AppleDemoFilter_UIView : NSView

{   

    IBOutlet AppleDemoFilter_GraphView  *graphView;

    IBOutlet NSTextField                *cutoffFrequencyField;

    IBOutlet NSTextField                *resonanceField;

    // Other Members

    AudioUnit               mAU;

    AUEventListenerRef      mAUEventListener;

    FrequencyResponse      *mData;              // the data used to draw the filter curve

    NSColor                *mBackgroundColor;   // the background color (pattern) of the view

}

#pragma mark ____ PUBLIC FUNCTIONS ____

- (void)setAU:(AudioUnit)inAU;

#pragma mark ____ INTERFACE ACTIONS ____

- (IBAction) cutoffFrequencyChanged:(id)sender;

- (IBAction) resonanceChanged:(id)sender;

#pragma mark ____ PRIVATE FUNCTIONS

- (void)priv_synchronizeUIWithParameterValues;

- (void)priv_addListeners;

- (void)priv_removeListeners;

#pragma mark ____ LISTENER CALLBACK DISPATCHEE ____

- (void)priv_eventListener:(void *) inObject event:(const AudioUnitEvent *)inEvent value:(Float32)inValue;

@end