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Controller.m

/*

    File: Controller.m

Abstract: Handles initialization of the ImageView as well as communication between other controls and the ImageView's Image

 Version: 1.2

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*/

#import "Controller.h"

#import "ImageView.h"

#include <tgmath.h>

@interface Controller()

-(void)openImageDidEnd:(NSOpenPanel*)panel returnCode:(NSInteger)returnCode contextInfo:(void*)contextInfo;

-(void)saveImageDidEnd:(NSSavePanel*)panel returnCode:(NSInteger)returnCode contextInfo:(void*)contextInfo;

@end

@implementation Controller

-(id)init

    self = [super init];

    if(self != nil)

        rotation = 0.0f;

        scaleX = 1.0f;

        scaleY = 1.0f;

        translateX = 0.0f;

        translateY = 0.0f;

        preserveAspectRatio = NO;

    return self;

- (void)awakeFromNib

    openImageIOSupportedTypes = NULL;

    // Ask CFBundle for the location of our demo image

    CFURLRef url = CFBundleCopyResourceURL(CFBundleGetMainBundle(), CFSTR("demo"), CFSTR("png"), NULL);

    if(url != NULL)

        // And if available, load it

        [imageView setImage:IICreateImage(url)];

        CFRelease(url);

    [[imageView window] center];

    [self setPreserveAspectRatio:NO];

    [self resetTransformations];

-(void)dealloc

    if(openImageIOSupportedTypes != NULL)

        CFRelease(openImageIOSupportedTypes);

    [super dealloc];

- (IBAction)changeScaleX:(id)sender

    [self setScaleX:scaleX + [sender floatValue]];

    [sender setFloatValue:0.0f];

- (IBAction)changeScaleY:(id)sender

    [self setScaleY:scaleY + [sender floatValue]];

    [sender setFloatValue:0.0f];

- (IBAction)changeTranslateX:(id)sender

    [self setTranslateX:translateX + [sender floatValue]];

    [sender setFloatValue:0.0f];

- (IBAction)changeTranslateY:(id)sender

    [self setTranslateY:translateY + [sender floatValue]];

    [sender setFloatValue:0.0f];

- (IBAction)reset:(id)sender

    [self resetTransformations];

    [imageView setNeedsDisplay:YES];

- (BOOL)canOpenURLWithImageIO:(NSURL*)fileURL

    BOOL imageFile = NO;

    NSString *uti = nil;

    NSWorkspace *workspace = [NSWorkspace sharedWorkspace];

    if([fileURL respondsToSelector:@selector(getResourceValue:forKey:error:)])

        // Prefer to get the UTI directly from the URL when available (10.6).

        [fileURL getResourceValue:&uti forKey:NSURLTypeIdentifierKey error:nil];

    else

        // Otherwise get a path string and ask NSWorkspace to give us this information (10.5).

        // TODO: verify this is the right way to get the file system path

        uti = [workspace typeOfFile:[fileURL path] error:nil];

    if((uti != nil) && ([workspace type:uti conformsToType:(NSString*)kUTTypeImage]))

        NSArray *supportedTypes = [NSMakeCollectable(CGImageSourceCopyTypeIdentifiers()) autorelease];

        for(NSString *supportedUTI in supportedTypes)

            if([workspace type:uti conformsToType:supportedUTI])

                imageFile = YES;

                break;

    return imageFile;

// Returns an array with the extensions that match the given Uniform Type Identifier (UTI).

-(NSArray*)extensionsForUTI:(CFStringRef)uti

    // If anything goes wrong, we'll return nil, otherwise this will be the array of extensions for this image type.

    NSArray * extensions = nil;

    // Only get extensions for UTIs that are images (i.e. conforms to public.image aka kUTTypeImage)

    // This excludes PDF support that ImageIO advertises, but won't actually use.

    if(UTTypeConformsTo(uti, kUTTypeImage))

        // Copy the decleration for the UTI (if it exists)

        CFDictionaryRef decleration = UTTypeCopyDeclaration(uti);

        if(decleration != NULL)

            // Grab the tags for this UTI, which includes extensions, OSTypes and MIME types.

            CFDictionaryRef tags = CFDictionaryGetValue(decleration, kUTTypeTagSpecificationKey);

            if(tags != NULL)

                // We are interested specifically in the extensions that this UTI uses

                CFTypeRef filenameExtensions = CFDictionaryGetValue(tags, kUTTagClassFilenameExtension);

                if(filenameExtensions != NULL)

                    // It is valid for a UTI to export either an Array (of Strings) representing multiple tags,

                    // or a String representing a single tag.

                    CFTypeID type = CFGetTypeID(filenameExtensions);

                    if(type == CFStringGetTypeID())

                        // If a string was exported, then wrap it up in an array.

                        extensions = [NSArray arrayWithObject:(NSString*)filenameExtensions];

                    else if(type == CFArrayGetTypeID())

                        // If an array was exported, then just return that array.

                        extensions = [[(NSArray*)filenameExtensions copy] autorelease];

            CFRelease(decleration);

    return extensions;

// On Tiger NSOpenPanel only understands extensions, not UTIs, so we have to obtain a list of extentions

// from the UTIs that Image IO tells us it can handle.

-(void)createOpenTypesArray

    if(openImageIOSupportedTypes == NULL)

        CFArrayRef imageIOUTIs = CGImageSourceCopyTypeIdentifiers();

        CFIndex i, count = CFArrayGetCount(imageIOUTIs);

        openImageIOSupportedTypes = [[NSMutableArray alloc] initWithCapacity:count];

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

            [openImageIOSupportedTypes addObjectsFromArray:

                [self extensionsForUTI:CFArrayGetValueAtIndex(imageIOUTIs, i)]];

        CFRelease(imageIOUTIs);

-(IBAction)openDocument:(id)sender

    NSOpenPanel * panel = [NSOpenPanel openPanel];

    [panel setAllowsMultipleSelection:NO];

    [panel setResolvesAliases:YES];

    [panel setTreatsFilePackagesAsDirectories:YES];

    [panel setMessage:@"Please choose an image file."];

    [self createOpenTypesArray];

    [panel

        beginSheetForDirectory:nil

        file:nil

        types:openImageIOSupportedTypes

        modalForWindow:[imageView window]

        modalDelegate:self

        didEndSelector:@selector(openImageDidEnd:returnCode:contextInfo:)

        contextInfo:nil];

-(void)openImageDidEnd:(NSOpenPanel*)panel returnCode:(NSInteger)returnCode contextInfo:(void*)contextInfo

    if(returnCode == NSOKButton)

        if([[panel filenames] count] > 0)

            ImageInfo * image = IICreateImage((CFURLRef)[NSURL fileURLWithPath:[[panel filenames] objectAtIndex:0]]);

            if(image != NULL)

                // Ownership is transferred to the ImageView.

                [imageView setImage:image];

                [self reset:nil];

-(IBAction)saveDocumentAs:(id)sender

    NSSavePanel * panel = [NSSavePanel savePanel];

    [panel setCanSelectHiddenExtension:YES];

    [panel setRequiredFileType:@"png"];

    [panel setAllowsOtherFileTypes:NO];

    [panel setTreatsFilePackagesAsDirectories:YES];

    [panel

        beginSheetForDirectory:nil

        file:@"untitled image"

        modalForWindow:[imageView window]

        modalDelegate:self

        didEndSelector:@selector(saveImageDidEnd:returnCode:contextInfo:)

        contextInfo:nil];

-(void)saveImageDidEnd:(NSSavePanel*)panel returnCode:(NSInteger)returnCode contextInfo:(void*)contextInfo

    if(returnCode == NSOKButton)

        NSRect frame = [imageView frame];

        IISaveImage([imageView image], (CFURLRef)[panel URL], ceilf(frame.size.width), ceilf(frame.size.height));

-(void)setRotation:(CGFloat)r

    r = fmodf(r, 360.0f);

    if(r < 0.0f)

        r += 360.0f;

    rotation = r;

    [imageView image]->rotation = 360.0f - r;

    [imageView setNeedsDisplay:YES];

-(void)setScaleX:(CGFloat)x

    [imageView image]->scaleX = scaleX = x;

    if(preserveAspectRatio)

        [imageView image]->scaleY = scaleX;

    [imageView setNeedsDisplay:YES];

-(void)setScaleY:(CGFloat)y

    scaleY = y;

    if(!preserveAspectRatio)

        [imageView image]->scaleY = scaleY;

        [imageView setNeedsDisplay:YES];

-(void)setScaleX:(CGFloat)x andY:(CGFloat)y

    [imageView image]->scaleX = scaleX = x;

    scaleY = y;

    if(preserveAspectRatio)

        [imageView image]->scaleY = scaleX;

    else

        [imageView image]->scaleY = scaleY;

    [imageView setNeedsDisplay:YES];

-(void)setPreserveAspectRatio:(BOOL)preserve

    preserveAspectRatio = preserve;

    [imageView image]->scaleX = scaleX;

    if(preserveAspectRatio)

        [imageView image]->scaleY = scaleX;

    else

        [imageView image]->scaleY = scaleY;

    [scaleYView setHidden:preserveAspectRatio];

    [textScaleYView setHidden:preserveAspectRatio];

    [textLabelXView setHidden:preserveAspectRatio];

    [textLabelYView setHidden:preserveAspectRatio];

    [imageView setNeedsDisplay:YES];

-(void)setTranslateX:(CGFloat)x

    [imageView image]->translateX = translateX = x;

    [imageView setNeedsDisplay:YES];

-(void)setTranslateY:(CGFloat)y

    [imageView image]->translateY = translateY = y;

    [imageView setNeedsDisplay:YES];

-(void)setTranslateX:(CGFloat)x andY:(CGFloat)y

    [imageView image]->translateX = translateX = x;

    [imageView image]->translateY = translateY = y;

    [imageView setNeedsDisplay:YES];

-(void)resetTransformations

    [self setRotation:0.0f];

    [self setScaleX:1.0f andY:1.0f];

    [self setTranslateX:0.0f andY:0.0f];

-(float)rotation

    return rotation;

-(CGFloat)scaleX

    return scaleX;

-(CGFloat)scaleY

    return scaleY;

-(BOOL)preserveAspectRatio

    return preserveAspectRatio;

-(CGFloat)translateX

    return translateX;

-(CGFloat)translateY

    return translateY;

@end

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