/*

        File: ImageInfo.m

    Abstract: ImageInfo class.

     Version: 1.0

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    Copyright (C) 2009 Apple Inc. All Rights Reserved.

*/

#import "ImageInfo.h"

#define kQCPlugIn_Name              @"Image Information"

#define kQCPlugIn_Description       @"Show image in setting pane"

@interface ImageInfo (Internal)

- (void) _releasedUnusedControllers;

- (void) _setImageForControllers:(id<QCPlugInInputImageSource>) image;

@end

@implementation ImageInfo

@dynamic inputImage;

+ (NSDictionary*) attributes

{

    /* Return the attributes of this plug-in */

    return [NSDictionary dictionaryWithObjectsAndKeys:kQCPlugIn_Name, QCPlugInAttributeNameKey, kQCPlugIn_Description, QCPlugInAttributeDescriptionKey, nil];

}

+ (NSDictionary*) attributesForPropertyPortWithKey:(NSString*)key

{

    /* Return the attributes for the plug-in property ports */

    if([key isEqualToString:@"inputImage"])

    return [NSDictionary dictionaryWithObjectsAndKeys:@"Image", QCPortAttributeNameKey, nil];

    return nil;

}

+ (QCPlugInExecutionMode) executionMode

{

    /* This plug-in is a consumer */

    return kQCPlugInExecutionModeConsumer;

}

+ (QCPlugInTimeMode) timeMode

{

    /* This plug-in does not depend on the time (time parameter is completely ignored in the -execute:atTime:withArguments: method). Only needs to be executed when input image changes */

    return kQCPlugInTimeModeNone;

}

- (id) init

{

    /* When plug-in is initialized. Initialized our array that will keep track or active plug-in controllers */

    if (self = [super init])

        _plugInControllers = [NSMutableArray new];

    return self;

}

- (void) dealloc

{

    /* Release plug-in controller array at dealloc */

    [_plugInControllers release];

    [super dealloc];

}

- (QCPlugInViewController*) createViewController

{

    QCPlugInViewController*         controller;

    /* Create plug-in controller and keep it around */

    controller = [[QCPlugInViewController alloc] initWithPlugIn:self viewNibName:@"ImageInfoUI"];

    /* In the case of when the setting pane is showed but image does not change, execute won't be called 

       We then need to set the image manually on the QCView */

    [(QCView*)[[[controller view] subviews] objectAtIndex:0] setValue:_image forInputKey:@"Image"];

    [_plugInControllers addObject:controller];

    return controller;

}

@end

@implementation ImageInfo (Internal)

/* Release unused plug-in controllers */

- (void) _releasedUnusedControllers

{

    NSInteger       i;

    for (i=[_plugInControllers count]-1; i>=0; --i) {

        if ([[_plugInControllers objectAtIndex:i] retainCount] == 1)

            [_plugInControllers removeObjectAtIndex:i];

    }

}

/* Sets all plug-in controller to the given image */

- (void) _setImageForControllers:(id<QCPlugInInputImageSource>) image

{

    NSUInteger      i;

    for (i=0; i<[_plugInControllers count]; ++i)

        [(QCView*)[[[[_plugInControllers objectAtIndex:i] view] subviews] objectAtIndex:0] setValue:self.inputImage forInputKey:@"Image"];

}

@end

@implementation ImageInfo (Execution)

- (BOOL) execute:(id<QCPlugInContext>)context atTime:(NSTimeInterval)time withArguments:(NSDictionary*)arguments

{

    /* Release unused plug-in controllers */

    if ([_plugInControllers count])

        [self _releasedUnusedControllers];

    /* Sets current input image on all controllers */

    if ([_plugInControllers count])

        [self _setImageForControllers:self.inputImage];

    /* Keep a reference to the image in the case a setting pane is showed later */

    if (_image != self.inputImage) {

        [(id)_image release];

        _image = [(id)self.inputImage retain];

    }

    /* Otherwise, this plug-in does nothing */

    return YES;

}

- (void) disableExecution:(id<QCPlugInContext>)context;

{

    /* Release unused plug-in controllers */

    [self _releasedUnusedControllers];

}

- (void) stopExecution:(id<QCPlugInContext>)context;

{

    /* Release unused plug-in controllers */

    [self _releasedUnusedControllers];

}

@end