/*

     File: PhotoCellViewController.m 

 Abstract: The view controller for each Photo Cell View. It is responsible for setting up the representedObject dictionary from a URL, determining the photo orientation, and providing the images for dragging.

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 */

#import "PhotoCellViewController.h"

// Helper function

NSImage *cacheImageOfView(NSView *view);

@implementation PhotoCellViewController

@synthesize photoView;

@synthesize labelView;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

{

    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

    if (self) {

    }

    return self;

}

- (void)loadView {

    [super loadView];

    [self.photoView unregisterDraggedTypes];

}

+ (PhotoCellViewController *)photoCellViewControllerWithURL:(NSURL *)url {

    MDItemRef mdItemRef = MDItemCreateWithURL(kCFAllocatorDefault, (CFURLRef)url);

    assert(mdItemRef);

    NSString *commentStr = [(NSString*)MDItemCopyAttribute(mdItemRef, kMDItemFinderComment) autorelease];

    if (!commentStr) commentStr = @"";

    CFRelease(mdItemRef);

    PhotoCellViewController *pcvController = [[PhotoCellViewController alloc] initWithNibName:@"PhotoCellView" bundle:nil];

    pcvController.representedObject = [NSDictionary dictionaryWithObjectsAndKeys:url, kImageUrlKey, commentStr, kLabelKey, nil];

    [pcvController loadView];

    return [pcvController autorelease];

}

- (PhotoCellOrientation)photoCellOrientation {

    PhotoCellOrientation orientation;

    NSImage *image = self.photoView.image;

    if (image) {

        NSSize imageSize = image.size;

        if (imageSize.width >= imageSize.height) {

            orientation = kPhotoCellOrientationLandscape;

        } else {

            orientation = kPhotoCellOrientationPortrait;

        }

    } else {

        orientation = kPhotoCellOrientationLandscape;

    }

    return orientation;

}

/* This method is called by MultiPhotoView to generate the dragging image components. The dragging image components for a Photo Cell View consist of the matte background, photo image, and comment label.

*/

- (NSArray*)imageComponentsForDrag {

    NSDraggingImageComponent *imageComponent;

    NSMutableArray *components = [NSMutableArray arrayWithCapacity:3];

    // Each dragging component image animates indpendantly. Since the photoView and labelView are subviews of the matte background view, we need to hide them so they are not included in the background image component snapshot.

    [self.photoView setHidden:YES];

    [self.labelView setHidden:YES];

    // dragging Image Components are painted from back to front, so but the background image first in the array.

    imageComponent = [NSDraggingImageComponent draggingImageComponentWithKey:@"background"];

    imageComponent.frame = self.view.bounds;

    imageComponent.contents = cacheImageOfView(self.view);

    [components addObject:imageComponent];

    // The matte background image snapshot is complete, we can show these views again.

    [self.photoView setHidden:NO];

    [self.labelView setHidden:NO];

    // snapshot the photo image

    imageComponent = [NSDraggingImageComponent draggingImageComponentWithKey:NSDraggingImageComponentIconKey];

    imageComponent.frame = [self.view convertRect:self.photoView.bounds fromView:self.photoView];

    imageComponent.contents = cacheImageOfView(self.photoView);

    [components addObject:imageComponent];

    // snapshot the label image

    imageComponent = [NSDraggingImageComponent draggingImageComponentWithKey:NSDraggingImageComponentLabelKey];

    imageComponent.frame = [self.view convertRect:self.labelView.bounds fromView:self.labelView];

    imageComponent.contents = cacheImageOfView(self.labelView);

    [components addObject:imageComponent];

    return components;

}

@end

NSImage *cacheImageOfView(NSView *view) {

    NSRect bounds = view.bounds;

    NSBitmapImageRep *bitmapImageRep = [view bitmapImageRepForCachingDisplayInRect:bounds];

    bzero([bitmapImageRep bitmapData], [bitmapImageRep bytesPerRow] * [bitmapImageRep pixelsHigh]);

    [view cacheDisplayInRect:bounds toBitmapImageRep:bitmapImageRep];

    NSImage *imageCache = [[NSImage alloc] initWithSize:[bitmapImageRep size]];

    [imageCache addRepresentation:bitmapImageRep];

    return [imageCache autorelease];

}

NSString * const kImageUrlKey = @"imageURL";

NSString * const kLabelKey = @"label";