/*

File: ImageInfoPanel.m

Abstract: ImageInfoPanel.m class implementation

Version: <1.0>

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Copyright © 2005-2012 Apple Inc. All Rights Reserved.

Change History (most recent first):

            1/08   added CFRelease() call to setURL: method to fix leak

*/

#import "ImageInfoPanel.h"

// This routine is provided so that the panel can dynamically 

// support all the file formats supported by ImageIO.

//

static NSString* ImageIOLocalizedString (NSString* key)

{

    static NSBundle* b = nil;

    if (b==nil)

        b = [NSBundle bundleWithIdentifier:@"com.apple.ImageIO.framework"];

    return [b localizedStringForKey:key value:key table: @"CGImageSource"];

}

@implementation DemoAppThumbView

- (void) dealloc

{

    [self setImage:nil];

}

- (void) setImage:(CGImageRef)image

{

    CGImageRetain(image);

    CGImageRelease(mImage);

    mImage = image;

    [self setNeedsDisplay:YES];

}

// compute bounds rect to hold our image

//

- (CGRect) boundsRectToFitImage

{

    float srcWidth  = (float)CGImageGetWidth (mImage);

    float srcHeight = (float)CGImageGetHeight(mImage);

    NSRect bounds = [self bounds];

    if ((srcWidth/srcHeight) < (bounds.size.width/bounds.size.height))

    {

        float w = bounds.size.height * srcWidth/srcHeight;

        bounds.origin.x += (bounds.size.width - w)/2;

        bounds.size.width = w;

    }

    else

    {

        float h = bounds.size.width * srcHeight/srcWidth;

        bounds.origin.y += (bounds.size.height - h)/2;

        bounds.size.height = h;

    }

    CGRect result = *(CGRect*)&bounds;

    result = CGRectIntegral(result);

    return result;

}

// This view completely covers its frame rectangle when drawing so return YES. 

//

- (BOOL) isOpaque

{

    return YES;

}

- (void) drawRect:(NSRect)rect

{

    // drawBackground

    [[NSColor colorWithCalibratedRed:0.95 green:0.95 blue:0.95 alpha:1.0] set];

    [NSBezierPath fillRect:[self bounds]];

    if (mImage)

    {

        NSGraphicsContext* nsctx = [NSGraphicsContext currentContext];

        CGContextRef  c = (CGContextRef)[nsctx graphicsPort];

        CGRect  r = [self boundsRectToFitImage];

        CGContextSetInterpolationQuality(c, kCGInterpolationNone);

        CGContextDrawImage(c, r, mImage);

    }

}

@end

#pragma mark -

ImageInfoPanel*  gSharedInfoPanel = nil;

@implementation ImageInfoPanel

- (void) awakeFromNib

{

    if (gSharedInfoPanel==nil)

        gSharedInfoPanel = self;

    [self setBecomesKeyOnlyIfNeeded:YES];

    NSNotificationCenter* nc = [NSNotificationCenter defaultCenter];

    [nc addObserver:self selector:@selector(windowBecameMain:) name:NSWindowDidBecomeMainNotification object:nil];

    [nc addObserver:self selector:@selector(windowResignedMain:) name:NSWindowDidResignMainNotification object:nil];

}

- (void) windowBecameMain:(NSNotification*)notif

{

    NSWindow* w = [notif object];

    NSDocument* doc = [[NSDocumentController sharedDocumentController] documentForWindow:w];

    [self setURL:[doc fileURL]];

}

- (void) windowResignedMain:(NSNotification*)notif

{

    [self setURL:nil];

}

- (void) dealloc

{

    [[NSNotificationCenter defaultCenter] removeObserver:self];

}

// Build image property tree for display of image properties in the

// image information panel

//

- (NSArray*) propTree:(NSDictionary*)branch

{

    NSMutableArray* tree = [[NSMutableArray alloc] init];

    unsigned int i, count = [branch count];

    for (i=0; i<count; i++)

    {

        NSArray* keys = [[branch allKeys] sortedArrayUsingSelector:@selector(compare:)];

        NSString* key = [keys objectAtIndex:i];

        NSString* locKey = ImageIOLocalizedString(key);

        id obj = [branch objectForKey:key];

        NSDictionary* leaf = nil;

        if ([obj isKindOfClass:[NSDictionary class]])

            leaf = [NSDictionary dictionaryWithObjectsAndKeys:

                        locKey,@"key",  @"",@"val",  [self propTree:obj],@"children",  nil];

        else

            leaf = [NSDictionary dictionaryWithObjectsAndKeys:

                        locKey,@"key",  obj,@"val",  nil];

        [tree addObject:leaf];

    }

    return tree;

}

// Image Info Panel setup:

// - Create the image thumbnail for the image info panel

// - Create the metadata tree for the info panel's outline view

// - Set the image path, image file type and image file size strings

//

- (void) setURL:(NSURL*)url

{

    if (nil == url) {

        return;

    }

    if ([url isEqual:mUrl])

        return;

    mUrl = url;

    CGImageSourceRef source = NULL;

    if (url) source = CGImageSourceCreateWithURL((__bridge CFURLRef)url, NULL);

//    CGImageSourceRef source = CGImageSourceCreateWithURL((__bridge CFURLRef)url, NULL);

    if (source)

    {

        // get image properties (height, width, depth, metadata etc.) for display

        NSDictionary* props = (__bridge_transfer NSDictionary*) CGImageSourceCopyPropertiesAtIndex(source, 0, NULL);

        [mTree setContent:[self propTree:props]];

        // image thumbnail options

        NSDictionary* thumbOpts = [NSDictionary dictionaryWithObjectsAndKeys:

                        (id)kCFBooleanTrue, (id)kCGImageSourceCreateThumbnailWithTransform,

                        (id)kCFBooleanTrue, (id)kCGImageSourceCreateThumbnailFromImageIfAbsent,

                        [NSNumber numberWithInt:128], (id)kCGImageSourceThumbnailMaxPixelSize, 

                        nil];

        // make image thumbnail

        CGImageRef image = CGImageSourceCreateThumbnailAtIndex(source, 0, (__bridge CFDictionaryRef)thumbOpts);

        [mThumbView setImage:image];

        CGImageRelease(image);

        // set image path string for image info panel

        [mFilePath setStringValue:[mUrl path]];

        // set image type string for image info panel

        NSString* uti = (__bridge NSString*)CGImageSourceGetType(source);

        [mFileType setStringValue:[NSString stringWithFormat:@"%@\n%@",

                        ImageIOLocalizedString(uti), uti]];

        // set image size string for image info panel

        CFDictionaryRef fileProps = CGImageSourceCopyProperties(source, nil);

        [mFileSize setStringValue:[NSString stringWithFormat:@"%@ bytes",

            (__bridge id)CFDictionaryGetValue(fileProps, kCGImagePropertyFileSize)]];

        CFRelease(fileProps);

        CFRelease(source);

    }

    else  // couldn't make image source for image, so display nothing

    {

        [mTree setContent:nil];

        [mThumbView setImage:nil];

        [mFilePath setStringValue:@""];

        [mFileType setStringValue:@""];

        [mFileSize setStringValue:@""];

    }

}

+ (void) setURL:(NSURL*)url

{

    // Update the info panel after a short delay so that 

    // we don't slow down the display of the main window.

    [gSharedInfoPanel performSelector:@selector(setURL:) withObject:url afterDelay:0.01];

}

@end