/*

     File: MyGreatAUEffectWithCocoaUI_CocoaView.m

 Abstract: Audio Unit Cocoa View imlementation.

  Version: 1.0.1

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*/

#import "MyGreatAUEffectWithCocoaUI_CocoaView.h"

enum {

    kParam_One =0,

    kNumberOfParameters=1

};

#pragma mark ____ LISTENER CALLBACK DISPATCHER ____

void ParameterListenerDispatcher (void *inRefCon, void *inObject, const AudioUnitParameter *inParameter, Float32 inValue) {

    MyGreatAUEffectWithCocoaUI_CocoaView *SELF = (MyGreatAUEffectWithCocoaUI_CocoaView *)inRefCon;

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

}

NSString *MyGreatAUEffectWithCocoaUI_GestureSliderMouseDownNotification = @"CAGestureSliderMouseDownNotification";

NSString *MyGreatAUEffectWithCocoaUI_GestureSliderMouseUpNotification = @"CAGestureSliderMouseUpNotification";

@implementation MyGreatAUEffectWithCocoaUI_GestureSlider

/*  We create our own custom subclass of NSSlider so we can do begin/end gesture notification

    We cannot override mouseUp: because it will never be called. Instead we do a clever trick in mouseDown to send mouseUp notifications */

- (void)mouseDown:(NSEvent *)inEvent {

    [[NSNotificationCenter defaultCenter] postNotificationName: MyGreatAUEffectWithCocoaUI_GestureSliderMouseDownNotification object: self];

    [super mouseDown: inEvent]; // this call does not return until mouse tracking is complete

                                // once tracking is done, we know the mouse has been released, so we can send our mouseup notification

    [[NSNotificationCenter defaultCenter] postNotificationName: MyGreatAUEffectWithCocoaUI_GestureSliderMouseUpNotification object: self];

}

@end

@implementation MyGreatAUEffectWithCocoaUI_CocoaView

#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;

    mParameter[0].mAudioUnit = inAU;

    mParameter[0].mParameterID = kParam_One;

    mParameter[0].mScope = kAudioUnitScope_Global;

    mParameter[0].mElement = 0; 

    // add new listeners

    [self addListeners];

    // initial setup

    [self synchronizeUIWithParameterValues];

}

#pragma mark ____ INTERFACE ACTIONS ____

- (IBAction)iaParam1Changed:(id)sender {

    float floatValue = [sender floatValue];

    OSStatus result = AUParameterSet(mParameterListener, sender, &mParameter[0], (Float32)floatValue, 0);

    NSAssert(result == noErr, @"[MyGreatAUEffectWithCocoaUI_CocoaView iaParam1Changed:] AUParameterSet()");

    if (sender == uiParam1Slider) {

        [uiParam1TextField setFloatValue:floatValue];

    } else {

        [uiParam1Slider setFloatValue:floatValue];

    }

}

#pragma mark ____ NOTIFICATIONS ____

// This routine is called when the user has clicked on the slider. We need to send a begin parameter change gesture to alert hosts that the parameter may be changing value

-(void) handleMouseDown: (NSNotification *) aNotification {

    if ([aNotification object] == uiParam1Slider) {

        AudioUnitEvent event;

        event.mArgument.mParameter = mParameter[0];

        event.mEventType = kAudioUnitEvent_BeginParameterChangeGesture;

        AUEventListenerNotify (NULL, self, &event);     // NOTE, if you have an AUEventListenerRef because you are listening to event notification, 

                                                        // pass that as the first argument to AUEventListenerNotify instead of NULL 

    }

}

-(void) handleMouseUp: (NSNotification *) aNotification {

    if ([aNotification object] == uiParam1Slider) {

        AudioUnitEvent event;

        event.mArgument.mParameter = mParameter[0];

        event.mEventType = kAudioUnitEvent_EndParameterChangeGesture;

        AUEventListenerNotify (NULL, self, &event);     // NOTE, if you have an AUEventListenerRef because you are listening to event notification, 

                                                        // pass that as the first argument to AUEventListenerNotify instead of NULL 

    }

}

#pragma mark ____ PRIVATE FUNCTIONS ____

- (void)addListeners {

    OSStatus result = AUListenerCreate( ParameterListenerDispatcher, self, 

                                    CFRunLoopGetCurrent(), kCFRunLoopDefaultMode, 0.100, // 100 ms

                                    &mParameterListener );

    NSAssert(result == noErr, @"[MyGreatAUEffectWithCocoaUI_CocoaView _addListeners] AUListenerCreate()");

    int i;

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

        mParameter[i].mAudioUnit = mAU;

        result = AUListenerAddParameter (mParameterListener, NULL, &mParameter[i]);

        NSAssert(result == noErr, @"[MyGreatAUEffectWithCocoaUI_CocoaView _addListeners] AUListenerAddParameter()");

    }

    [[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(handleMouseDown:) name:MyGreatAUEffectWithCocoaUI_GestureSliderMouseDownNotification object: uiParam1Slider];

    [[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(handleMouseUp:) name:MyGreatAUEffectWithCocoaUI_GestureSliderMouseUpNotification object: uiParam1Slider];

}

- (void)removeListeners {

    OSStatus result;

    int i;

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

        result = AUListenerRemoveParameter(mParameterListener, NULL, &mParameter[i]);

        NSAssert(result == noErr, @"[MyGreatAUEffectWithCocoaUI_CocoaView _removeListeners] AUListenerRemoveParameter()");

    }

    result = AUListenerDispose(mParameterListener);

    NSAssert(result == noErr, @"[MyGreatAUEffectWithCocoaUI_CocoaView _removeListeners] AUListenerDispose()");

    [[NSNotificationCenter defaultCenter] removeObserver: self name:MyGreatAUEffectWithCocoaUI_GestureSliderMouseDownNotification object: uiParam1Slider];

    [[NSNotificationCenter defaultCenter] removeObserver: self name:MyGreatAUEffectWithCocoaUI_GestureSliderMouseUpNotification object: uiParam1Slider];

}

- (void)synchronizeUIWithParameterValues {

    OSStatus result;

    Float32 value;

    int i;

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

        // only has global parameters

        result = AudioUnitGetParameter(mAU, mParameter[i].mParameterID, kAudioUnitScope_Global, 0, &value);

        NSAssert(result == noErr, @"[MyGreatAUEffectWithCocoaUI_CocoaView synchronizeUIWithParameterValues] (x.1)");

        result = AUParameterSet (mParameterListener, self, &mParameter[i], value, 0);

        NSAssert(result == noErr, @"[MyGreatAUEffectWithCocoaUI_CocoaView synchronizeUIWithParameterValues] (x.2)");

        result = AUParameterListenerNotify (mParameterListener, self, &mParameter[i]);

        NSAssert(result == noErr, @"[MyGreatAUEffectWithCocoaUI_CocoaView synchronizeUIWithParameterValues] (x.3)");

    }

}

#pragma mark ____ LISTENER CALLBACK DISPATCHEE ____

- (void)parameterListener:(void *)inObject parameter:(const AudioUnitParameter *)inParameter value:(Float32)inValue {

    //inObject ignored in this case.

    switch (inParameter->mParameterID) {

        case kParam_One:

                    [uiParam1Slider setFloatValue:inValue];

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

                    break;

    }

}

@end