/*

     File: APLCollectionViewController.m

 Abstract: Base UICollectionViewController containing the basic functionality for collection views.

  Version: 1.1

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 */

#import "APLCollectionViewController.h"

#import "APLTransitionLayout.h"

#import "APLCollectionViewCell.h"

#define USE_IMAGES   1  // if 1 images are used for each cell, if 0 we use varying UIColors swatches for each cell

#define MAX_COUNT    24

#define CELL_ID      @"CELL_ID"

#pragma mark -

@implementation APLCollectionViewController

- (id)initWithCollectionViewLayout:(UICollectionViewFlowLayout *)layout

{

    if (self = [super initWithCollectionViewLayout:layout])

    {

        // make sure we know about our cell prototype so dequeueReusableCellWithReuseIdentifier can work

        [self.collectionView registerClass:[APLCollectionViewCell class] forCellWithReuseIdentifier:CELL_ID];

    }

    return self;

}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath

{

    APLCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:CELL_ID forIndexPath:indexPath];

#if USE_IMAGES

    // set the cell to use an image

    cell.imageView.image = [UIImage imageNamed:[NSString stringWithFormat:@"sa%ld.jpg", (long)indexPath.item]];

#else

    // set the cell to use a color swatch

    CGFloat hue = ((CGFloat)indexPath.item)/MAX_COUNT;

    UIColor *cellColor = [UIColor colorWithHue:hue saturation:1.0 brightness:1.0 alpha:1.0];

    cell.contentView.backgroundColor = cellColor;

#endif

    return cell;

}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section

{

    return MAX_COUNT;

}

- (UICollectionViewController *)nextViewControllerAtPoint:(CGPoint)p

{

    return nil; // subclass must override this method

}

// return our own UICollectionViewTransitionLayout object subclass to help in the transition

// the cell positions based on gesture position

//

- (UICollectionViewTransitionLayout *)collectionView:(UICollectionView *)collectionView transitionLayoutForOldLayout:(UICollectionViewLayout *)fromLayout newLayout:(UICollectionViewLayout *)toLayout

{

    APLTransitionLayout *myCustomTransitionLayout =

        [[APLTransitionLayout alloc] initWithCurrentLayout:fromLayout nextLayout:toLayout];

    return myCustomTransitionLayout;

}

@end