/*

     File: APLAppDelegate.m

 Abstract: Template delegate for the application.

  Version: 1.1

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 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

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 */

#import "APLAppDelegate.h"

#import "APLTransitionManager.h"

#import "APLStackLayout.h"

#import "APLStackCollectionViewController.h"

@interface APLAppDelegate () <UINavigationControllerDelegate, APLTransitionManagerDelegate>

@property (nonatomic) APLTransitionManager *transitionManager;

@end

#pragma mark -

@implementation APLAppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

    UINavigationController *navController = (UINavigationController *)self.window.rootViewController;

    // setup our layout and initial collection view

    APLStackLayout *stackLayout = [[APLStackLayout alloc] init];

    APLStackCollectionViewController *collectionViewController = [[APLStackCollectionViewController alloc] initWithCollectionViewLayout:stackLayout];

    collectionViewController.title = @"Stack Layout";

    navController.navigationBar.translucent = NO;

    navController.delegate = self;

    // add the single collection view to our navigation controller

    [navController setViewControllers:@[collectionViewController]];

    // we want a light gray for the navigation bar, otherwise it defaults to white

    navController.navigationBar.barTintColor = [UIColor lightGrayColor];

    // create our "transitioning" object to manage the pinch gesture to transitition between stack and grid layouts

    _transitionManager =

        [[APLTransitionManager alloc] initWithCollectionView:collectionViewController.collectionView];

    self.transitionManager.delegate = self;

    return YES;

}

#pragma mark - APLTransitionControllerDelegate

- (void)interactionBeganAtPoint:(CGPoint)p

{

    UINavigationController *navController = (UINavigationController *)self.window.rootViewController;

    // Very basic communication between the transition controller and the top view controller

    // It would be easy to add more control, support pop, push or no-op.

    //

    UIViewController *viewController =

        [(APLCollectionViewController *)navController.topViewController nextViewControllerAtPoint:p];

    if (viewController != nil)

    {

        [navController pushViewController:viewController animated:YES];

    }

    else

    {

        [navController popViewControllerAnimated:YES];

    }

}

#pragma mark - UINavigationControllerDelegate

- (id <UIViewControllerInteractiveTransitioning>)navigationController:(UINavigationController *)navigationController

                          interactionControllerForAnimationController:(id <UIViewControllerAnimatedTransitioning>) animationController

{

    // return our own transition manager if the incoming controller matches ours

    if (animationController == self.transitionManager)

    {

        return self.transitionManager;

    }

    return nil;

}

- (id <UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController

                                   animationControllerForOperation:(UINavigationControllerOperation)operation

                                                fromViewController:(UIViewController *)fromVC

                                                  toViewController:(UIViewController *)toVC

{

    id transitionManager = nil;

    // make sure we are transitioning from or to a collection view controller, and that interaction is allowed

    if ([fromVC isKindOfClass:[UICollectionViewController class]] &&

        [toVC isKindOfClass:[UICollectionViewController class]] &&

        self.transitionManager.hasActiveInteraction)

    {

        self.transitionManager.navigationOperation = operation;

        transitionManager = self.transitionManager;

    }

    return transitionManager;

}

@end