/*

     File: SampleEffectCocoaView.m

 Abstract: SampleEffectCocoaView.h

  Version: 1.1

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 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

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 */

/*

    SampleEffectCocoaView.m

    View class manufactured by SampleEffectCocoaViewFactory factory class.

    This view is instantiated via nib.

*/

#import "SampleEffectCocoaView.h"

enum {

    kParam_One,

    kParam_Two,

    kParam_Three_Indexed,

    kNumberOfParameters

};

AudioUnitParameter parameter[] = {  { 0, kParam_One, kAudioUnitScope_Global, 0 },

                                    { 0, kParam_Two, kAudioUnitScope_Global, 0 },

                                    { 0, kParam_Three_Indexed, kAudioUnitScope_Global, 0 }  };

@implementation SampleEffectCocoaView

#pragma mark -

#pragma mark Listener Callback Handling

- (void)_parameterListener:(void *)inObject parameter:(const AudioUnitParameter *)inParameter value:(AudioUnitParameterValue)inValue {

    // inObject ignored in this case.

    switch (inParameter->mParameterID) {

        case kParam_One:

            [uiParam1Slider setFloatValue:inValue];

            [uiParam1TextField setStringValue:[[NSNumber numberWithFloat:inValue] stringValue]];

            break;

        case kParam_Two:

            [uiParam2Slider setFloatValue:inValue];

            [uiParam2TextField setStringValue:[[NSNumber numberWithFloat:inValue] stringValue]];

            break;

        case kParam_Three_Indexed:

            [uiParam3Matrix setState:NSOnState atRow:(inValue - 4) column:0];

            break;

    }

}

void ParameterListenerDispatcher (void *inRefCon, void *inObject, const AudioUnitParameter *inParameter, AudioUnitParameterValue inValue) {

    SampleEffectCocoaView *SELF = (SampleEffectCocoaView *)inRefCon;

    [SELF _parameterListener:inObject parameter:inParameter value:inValue];

}

#pragma mark -

#pragma mark Private Functions

- (void)_addListeners {

    verify_noerr ( AUListenerCreate (   ParameterListenerDispatcher, self, CFRunLoopGetCurrent(),

                                        kCFRunLoopDefaultMode, 0.100 /* 100 ms */, &mParameterListener  ));

    int i;

    for (i = 0; i < kNumberOfParameters; ++i) {

        parameter[i].mAudioUnit = mAU;

        verify_noerr ( AUListenerAddParameter (mParameterListener, NULL, &parameter[i]));

    }

}

- (void)_removeListeners {

    int i;

    for (i = 0; i < kNumberOfParameters; ++i) {

        verify_noerr ( AUListenerRemoveParameter(mParameterListener, NULL, &parameter[i]) );

    }

    verify_noerr (  AUListenerDispose(mParameterListener) );

}

- (void)_synchronizeUIWithParameterValues {

    AudioUnitParameterValue value;

    int i;

    for (i = 0; i < kNumberOfParameters; ++i) {

        // only has global parameters

        verify_noerr (AudioUnitGetParameter(mAU, parameter[i].mParameterID, kAudioUnitScope_Global, 0, &value));

        verify_noerr (AUParameterSet (mParameterListener, self, &parameter[i], value, 0));

        verify_noerr (AUParameterListenerNotify (mParameterListener, self, &parameter[i]));

    }

}

#pragma mark ____ (INIT /) DEALLOC ____

- (void)dealloc {

    [self _removeListeners];

    [super dealloc];

}

#pragma mark ____ PUBLIC FUNCTIONS ____

- (void)setAU:(AudioUnit)inAU {

    // remove previous listeners

    if (mAU)

        [self _removeListeners];

    mAU = inAU;

    if (mAU) {

        // add new listeners

        [self _addListeners];

        // initial setup

        [self _synchronizeUIWithParameterValues];

    }

}

#pragma mark ____ INTERFACE ACTIONS ____

- (IBAction)iaParam1Changed:(id)sender {

    float floatValue = [sender floatValue];

    verify_noerr (AUParameterSet(mParameterListener, sender, &parameter[0], floatValue, 0));

    if (sender == uiParam1Slider) {

        [uiParam1TextField setFloatValue:floatValue];

    } else {

        [uiParam1Slider setFloatValue:floatValue];

    }

}

- (IBAction)iaParam2Changed:(id)sender {

    float floatValue = [sender floatValue];

    verify_noerr (AUParameterSet(mParameterListener, sender, &parameter[1], floatValue, 0));

    if (sender == uiParam2Slider) {

        [uiParam2TextField setFloatValue:floatValue];

    } else {

        [uiParam2Slider setFloatValue:floatValue];

    }

}

- (IBAction)iaParam3Changed:(id)sender {

    verify_noerr (AUParameterSet(mParameterListener, sender, &parameter[2], [uiParam3Matrix selectedRow] + 4, 0));

}

@end