/*

     File: APLStackCollectionViewController.m

 Abstract: The UICollectionViewController containing the custom stack layout.

  Version: 1.1

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 */

#import "APLStackCollectionViewController.h"

#import "APLGridCollectionViewController.h"

#import "APLTransitionLayout.h"

@implementation APLStackCollectionViewController

- (void)viewDidAppear:(BOOL)animated

{

    [super viewDidAppear:animated];

    // NOTE: the following line of code is necessary to work around a bug in UICollectionView,

    // when you transition back to this view controller from a pinch inward gesture,

    // the z-ordering of the stacked photos may be wrong.

    //

    [self.collectionView reloadData];

}

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath

{

    // user tapped a stack of photos, navigate the grid layout view controller

    [self.navigationController pushViewController:[self nextViewControllerAtPoint:CGPointZero] animated:YES];

}

// obtain the next collection view controller based on where the user tapped in case there are multiple stacks

- (UICollectionViewController *)nextViewControllerAtPoint:(CGPoint)p

{

    // we could have multiple section stacks, so we need to find the right one

    UICollectionViewFlowLayout *grid = [[UICollectionViewFlowLayout alloc] init];

    grid.itemSize = CGSizeMake(75.0, 75.0);

    grid.sectionInset = UIEdgeInsetsMake(10.0, 10.0, 10.0, 10.0);

    APLGridCollectionViewController *nextCollectionViewController =

        [[APLGridCollectionViewController alloc] initWithCollectionViewLayout:grid];

    // Set "useLayoutToLayoutNavigationTransitions" to YES before pushing a a

    // UICollectionViewController onto a UINavigationController. The top view controller of

    // the navigation controller must be a UICollectionViewController that was pushed with

    // this property set to NO. This property should NOT be changed on a UICollectionViewController

    // that has already been pushed onto a UINavigationController.

    //

    nextCollectionViewController.useLayoutToLayoutNavigationTransitions = YES;

    nextCollectionViewController.title = @"Grid Layout";

    return nextCollectionViewController;

}

@end