/*

     File: AppDelegate.m 

 Abstract: This sample's NSApplicationDelegate object.

  Version: 1.1 

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 */

#import "AppDelegate.h"

@interface AppDelegate ()

@property (strong) NSMutableArray *data;

@property (assign) id initialSelectedObject;

@end

@implementation AppDelegate

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {

    NSURL *dirURL = [[NSBundle mainBundle] resourceURL];

    // load all the necessary image files by enumerating through the bundle's Resources folder,

    // this will only load images of type "kUTTypeImage"

    //

    self.data = [[NSMutableArray alloc] initWithCapacity:1];

    NSDirectoryEnumerator *itr = [[NSFileManager defaultManager] enumeratorAtURL:dirURL includingPropertiesForKeys:[NSArray arrayWithObjects:NSURLLocalizedNameKey, NSURLEffectiveIconKey, NSURLIsDirectoryKey, NSURLTypeIdentifierKey, nil] options:NSDirectoryEnumerationSkipsHiddenFiles | NSDirectoryEnumerationSkipsPackageDescendants | NSDirectoryEnumerationSkipsSubdirectoryDescendants errorHandler:nil];

    for (NSURL *url in itr) {

        NSString *utiValue;

        [url getResourceValue:&utiValue forKey:NSURLTypeIdentifierKey error:nil];

        if (UTTypeConformsTo((__bridge CFStringRef)(utiValue), kUTTypeImage)) {

            NSImage *image = [[NSImage alloc] initWithContentsOfURL:url];

            [self.data addObject:image];

        }

    }

    // set the first image in our list to the main magnifying view

    if ([self.data count] > 0) {

        [self.pageController setArrangedObjects:self.data];

    }

}

- (BOOL)validateMenuItem:(NSMenuItem *)menuItem {

    switch ([menuItem tag]) {

        case 0:

            [menuItem setState:(self.pageController.transitionStyle == NSPageControllerTransitionStyleHorizontalStrip) ?

                    NSOnState : NSOffState];

            break;

        case 1:

            [menuItem setState:(self.pageController.transitionStyle == NSPageControllerTransitionStyleStackHistory) ?

                    NSOnState : NSOffState];

            break;

        case 2:

            [menuItem setState:(self.pageController.transitionStyle == NSPageControllerTransitionStyleStackBook) ?

                    NSOnState : NSOffState];

            break;

    }

    return YES;

}

// user is choosing between "stack" style scrolling or "slide show" style scrolling

- (IBAction)takeTransitionStyleFrom:(id)sender {

    switch([sender tag]) {

        case 0:

            self.pageController.transitionStyle = NSPageControllerTransitionStyleHorizontalStrip;

            break;

        case 1:

            self.pageController.transitionStyle = NSPageControllerTransitionStyleStackHistory;

            break;

        case 2:

        default:

            self.pageController.transitionStyle = NSPageControllerTransitionStyleStackBook;

            break;

    }

}

@end

@implementation AppDelegate (NSPageControllerDelegate)

- (NSString *)pageController:(NSPageController *)pageController identifierForObject:(id)object {

    return @"picture";

}

- (NSViewController *)pageController:(NSPageController *)pageController viewControllerForIdentifier:(NSString *)identifier {

    return [[NSViewController alloc] initWithNibName:@"imageview" bundle:nil];

}

-(void)pageController:(NSPageController *)pageController prepareViewController:(NSViewController *)viewController withObject:(id)object {

    // viewControllers may be reused... make sure to reset important stuff like the current magnification factor.

    // Normally, we want to reset the magnification value to 1 as the user swipes to other images. However if the user cancels the swipe, we want to leave the original magnificaiton and scroll position alone.

    BOOL isRepreparingOriginalView = (self.initialSelectedObject && self.initialSelectedObject == object) ? YES : NO;

    if (!isRepreparingOriginalView) {

        [(NSScrollView*)viewController.view setMagnification:1.0];

    }

    // Since we implement this delegate method, we are reponsible for setting the representedObject.

    viewController.representedObject = object;

}

- (void)pageControllerWillStartLiveTransition:(NSPageController *)pageController {

    // Remember the initial selected object so we can determine when a cancel occurred.

    self.initialSelectedObject = [pageController.arrangedObjects objectAtIndex:pageController.selectedIndex];

}

- (void)pageControllerDidEndLiveTransition:(NSPageController *)pageController {

    [pageController completeTransition];

}

@end