/*

 File: FileBrowserView.m

 Abstract: FileBrowserView 

 Version: 1.0

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 */ 

#import "ICAHandler.h"

#import "ImageView.h"

#import "FileBrowserView.h"

#define MAX_ICON_SIZE       600

#define DEFAULT_ICON_SIZE   160

#define ICON_BORDER         20

#define X_INDENT            20

#define Y_INDENT            20

@implementation FileBrowserView

// simple view class to display image thumbnails for all images in a given folder

// in this sample we are not using a very simple way to arrange and draw the thumbnails, 

// real-world code will probably use a better way: create an objC wrapper for the image, let the

// wrapper do the drawing, hit detection, ....

// ---------------------------------------------------------------------------------------------------------------------

- (BOOL)isFlipped

{

    return YES;

}

// ---------------------------------------------------------------------------------------------------------------------

- (id)initWithFrame:(NSRect)frameRect

{

    if ((self = [super initWithFrame:frameRect]) != nil) 

    {

        // create a NSMutableDictionary to hold all the images... 

        mImages = [[NSMutableDictionary alloc] init];

        // update files and UI

        [self updateFiles];

    }

    return self;

}

// ---------------------------------------------------------------------------------------------------------------------

- (void)awakeFromNib

{

    // set the default thumbnail size

    mThumbnailSize = DEFAULT_ICON_SIZE;

    [mSlider setMaxValue: MAX_ICON_SIZE];

    [mSlider setDoubleValue: DEFAULT_ICON_SIZE];

}

// ---------------------------------------------------------------------------------------------------------------------

- (void)setFrameSize: (NSSize)newSize

{

    // readjust the frame height...

    int     iconSize = mThumbnailSize + ICON_BORDER;

    int     count = [mImages count];

    int     columns = newSize.width / iconSize;

    int     rows = (count / columns) + 1;

    [super setFrameSize: NSMakeSize( newSize.width, rows * iconSize)];

}

// ---------------------------------------------------------------------------------------------------------------------

- (CGImageRef)thumbnailForFile: (NSString*)name

                        atPath: (NSString*)filePath

{

    // use ImageIO to get a thumbnail for a file at a given path

    CGImageSourceRef    isr = NULL;

    NSString *          path = [filePath stringByExpandingTildeInPath];

    CGImageRef          image = NULL;

    path = [path stringByAppendingPathComponent: name];

    // create the CGImageSourceRef

    isr = CGImageSourceCreateWithURL((CFURLRef)[NSURL fileURLWithPath: path], NULL);

    if (isr)

    {

        // create a thumbnail:

        // - specify max pixel size

        // - create the thumbnail with honoring the EXIF orientation flag (correct transform)

        // - always create the thumbnail from the full image (ignore the thumbnail that may be embedded in the image -

        //                                                  reason: our MAX_ICON_SIZE is larger than existing thumbnail)

        image = CGImageSourceCreateThumbnailAtIndex (isr, 0, (CFDictionaryRef)[NSDictionary dictionaryWithObjectsAndKeys:

            [NSNumber numberWithInt: MAX_ICON_SIZE],  kCGImageSourceThumbnailMaxPixelSize,

            (id)kCFBooleanTrue,                       kCGImageSourceCreateThumbnailWithTransform,

            (id)kCFBooleanTrue,                       kCGImageSourceCreateThumbnailFromImageAlways,

            NULL] );

        CFRelease(isr);

    }

    return image;

}

// ---------------------------------------------------------------------------------------------------------------------

- (void)drawRect: (NSRect)rect

{

    CGContextRef    context = [[NSGraphicsContext currentContext] graphicsPort];

    NSRect          frame = [self frame];

    int             iconSize = mThumbnailSize + ICON_BORDER;

    int             loop;

    CGImageRef      icon;

    NSArray *       keys = [mImages allKeys];

    int             count = [keys count];

    NSString *      name;

    int             x = X_INDENT;

    int             y = frame.size.height + Y_INDENT - iconSize;

    CGRect          r;

    // blindly draw all the thumbnails

    // note: this could be optimized - there's no need to draw the thumbnails that are outside the update rect ('rect')

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

    {

        name = [keys objectAtIndex: loop];

        icon = (CGImageRef)[mImages objectForKey: name];

        // lazyly initialize the thumbnail image for a given file

        if ([NSNull null] == (id)icon)

        {

            icon = [self thumbnailForFile: name

                                   atPath: @"~/Pictures/myPhoto/"];

            if (icon)

            {

                [mImages setObject: (id)icon

                            forKey: name];

            } else

            {

                icon = [self thumbnailForFile: @""

                                       atPath: [[NSBundle mainBundle] pathForResource: @"file"

                                                                               ofType: @"tiff"]];

            }

        }

        // if we have the image - finally draw it

        if (icon)

        {

            r = CGRectMake(x, y,

                           CGImageGetWidth(icon) * mThumbnailSize / MAX_ICON_SIZE,

                           CGImageGetHeight(icon) * mThumbnailSize / MAX_ICON_SIZE);

            x += iconSize;

            if (x + iconSize> frame.size.width)

            {

                x = X_INDENT;

                y -= iconSize;

            }

            CGContextSaveGState(context);

            CGContextScaleCTM(context,1.,-1.);

            CGContextTranslateCTM(context,0.,-frame.size.height);

            CGContextDrawImage (context, r, icon );

            CGContextRestoreGState(context);

        }

    }

}

// ---------------------------------------------------------------------------------------------------------------------

- (void)updateFiles

{

    // sync files in mImages with what's in ~/Pictures/myPhoto/

    NSString *      path = [@"~/Pictures/myPhoto/" stringByExpandingTildeInPath];

    NSArray *       array = [[NSFileManager defaultManager] directoryContentsAtPath: path];

    NSEnumerator *  enumerator;

    NSMutableSet *  myImages = [[[NSMutableSet alloc] initWithArray: [mImages allKeys]] autorelease];

    NSMutableSet *  images   = [[[NSMutableSet alloc] initWithArray: array] autorelease];

    NSString *      name;

    // remove all images from myImages that are no longer on disk

    [myImages minusSet: images];

    enumerator = [myImages objectEnumerator];

    while (name = [enumerator nextObject])

    {

        [mImages removeObjectForKey: name];

    }

    // add all images from disk that are not in myImages

    myImages = [[[NSMutableSet alloc] initWithArray: [mImages allKeys]] autorelease];

    [images minusSet: myImages];

    enumerator = [images objectEnumerator];

    while (name = [enumerator nextObject])

    {

        if ('.' != [name characterAtIndex: 0])

            [mImages setObject: [NSNull null]

                        forKey: name];

    }

 //   NSLog(@"mImages = %@", mImages);

}

// ---------------------------------------------------------------------------------------------------------------------

- (IBAction)setThumbnailSize: (id)sender

{

    // user changed thumbnail size via slider: resize and redraw

    mThumbnailSize = round([sender floatValue]);

    NSRect frame = [self frame];

    [self setFrameSize: frame.size];

    [self setNeedsDisplay: YES];

}

// ---------------------------------------------------------------------------------------------------------------------

- (void)mouseDown: (NSEvent *)theEvent

{

    // when user double-clicks on a thumbnail, switch to 'single-image' mode...

    if ([theEvent clickCount] > 1)

    {

        // find the thumbnail that user double-clicked...

        // again - better way would be to create an objC wrapper for each image/thumbnail,

        // and ask each wrapper if mousedown was inside its rect...

        NSRect          frame = [self frame];

        int             iconSize = mThumbnailSize + ICON_BORDER;

        int             loop;

        int             count = [mImages count];

        int             x = X_INDENT;

        int             y = frame.size.height + Y_INDENT - iconSize;

        NSRect          r;

        NSPoint         loc = [self convertPoint: [theEvent locationInWindow] 

                                        fromView: NULL];

        loc.y = frame.size.height - loc.y;

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

        {

            r = NSMakeRect(x, y,  mThumbnailSize, mThumbnailSize);

            if (NSPointInRect(loc, r))

            {

                // if mousedown was inside thumbnails rect - ask mICAHandler (ImageView) to display the image

                [mICAHandler showImageAtIndex: loop];

                break;

            }

            x += iconSize;

            if (x + iconSize> frame.size.width)

            {

                x = X_INDENT;

                y -= iconSize;

            }

        }

    }

}

// ---------------------------------------------------------------------------------------------------------------------

- (void)showImageAtIndex: (int)index

{

    // display the image at given index in ImageView

    mCurrentIndex = index;

    NSArray *       keys = [mImages allKeys];

    NSString *      name;

    name = [keys objectAtIndex: index];

    NSString * path = [@"~/Pictures/myPhoto/" stringByExpandingTildeInPath];

    [mImageView setImagePath: [path stringByAppendingPathComponent: name]];

}

// ---------------------------------------------------------------------------------------------------------------------

- (void)nextImage

{

    // display the next image

    mCurrentIndex++;

    if (mCurrentIndex >= [mImages count])

        mCurrentIndex = 0;

    [self showImageAtIndex: mCurrentIndex];

}

// ---------------------------------------------------------------------------------------------------------------------

- (void)prevImage

{

    // display the previous image

    mCurrentIndex--;

    if (mCurrentIndex < 0)

        mCurrentIndex = [mImages count]-1;

    [self showImageAtIndex: mCurrentIndex];

}

@end