//
//  FWBookShelfDecarationViewCollectionReusableView.h
//  FWPersonalApp
//
//  Created by hzkmn on 16/2/18.
//  Copyright © 2016年 ForrstWoo. All rights reserved.
//

#import <UIKit/UIKit.h>extern NSInteger const kDecorationViewHeight;@interface FWBookShelfDecarationView : UICollectionReusableView@end

//
//  FWBookShelfDecarationViewCollectionReusableView.m
//  FWPersonalApp
//
//  Created by hzkmn on 16/2/18.
//  Copyright © 2016年 ForrstWoo. All rights reserved.
//
#import "FWBookShelfDecarationView.h"NSInteger const kDecorationViewHeight = 216;@implementation FWBookShelfDecarationView- (instancetype)initWithFrame:(CGRect)frame
{if (self = [super initWithFrame:frame]){UIImageView *img = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, screenSize.width, kDecorationViewHeight)];img.image = [UIImage imageNamed:@"boolshelf.png"];[self addSubview:img];}return self;
}
@end

//
//  FWBookshelfCollectionViewLayout.h
//  FWPersonalApp
//
//  Created by hzkmn on 16/2/18.
//  Copyright © 2016年 ForrstWoo. All rights reserved.
//

#import "LXReorderableCollectionViewFlowLayout.h"extern NSString * const FWBookshelfCollectionViewLayoutDecorationViewKind;@interface FWBookshelfCollectionViewLayout : LXReorderableCollectionViewFlowLayout@end

//
//  FWBookshelfCollectionViewLayout.m
//  FWPersonalApp
//
//  Created by hzkmn on 16/2/18.
//  Copyright © 2016年 ForrstWoo. All rights reserved.
//

#import "FWBookshelfCollectionViewLayout.h"#import "FWBookShelfDecarationView.h"NSString * const FWBookshelfCollectionViewLayoutDecorationViewKind = @"FWBookshelfCollectionViewLayoutDecorationViewKind";@interface FWBookshelfCollectionViewLayout ()@property (nonatomic, strong) NSDictionary *bookShelfRectanges;
@property NSInteger countOfRow;@end@implementation FWBookshelfCollectionViewLayout- (void)prepareLayout
{[super prepareLayout];[self registerClass:[FWBookShelfDecarationView class] forDecorationViewOfKind:FWBookshelfCollectionViewLayoutDecorationViewKind];NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];NSInteger itemCount = [self.collectionView numberOfItemsInSection:0];self.countOfRow = ceilf(itemCount / 3.0);for (int row = 0; row < self.countOfRow; row++){dictionary[[NSIndexPath indexPathForItem:row inSection:0]] = [NSValue valueWithCGRect:CGRectMake(0, kDecorationViewHeight * row, screenSize.width, kDecorationViewHeight)];}self.bookShelfRectanges = [NSDictionary dictionaryWithDictionary:dictionary];
}#pragma mark Runtime Layout Calculations
- (NSArray *)layoutAttributesForElementsInRect:(CGRect)rect
{// call super so flow layout can return default attributes for all cells, headers, and footers// NOTE: Flow layout has already taken care of the Cell view layout attributes! :)NSArray *array = [super layoutAttributesForElementsInRect:rect];// create a mutable copy so we can add layout attributes for any shelfs that// have frames that intersect the rect the CollectionView is interested inNSMutableArray *newArray = [array mutableCopy];//    NSLog(@"in rect:%@",NSStringFromCGRect(rect));// Add any decoration views (shelves) who's rect intersects with the// CGRect passed to the layout by the CollectionView[self.bookShelfRectanges enumerateKeysAndObjectsUsingBlock:^(id key, id shelfRect, BOOL *stop) {//        NSLog(@"[shelfRect CGRectValue]:%@",NSStringFromCGRect([shelfRect CGRectValue]));if (CGRectIntersectsRect([shelfRect CGRectValue], rect)){UICollectionViewLayoutAttributes *shelfAttributes =[self layoutAttributesForDecorationViewOfKind:FWBookshelfCollectionViewLayoutDecorationViewKindatIndexPath:key];[newArray addObject:shelfAttributes];}}];for (int i = 0; i < [self.collectionView numberOfItemsInSection:0]; i++){NSIndexPath *indexPath = [NSIndexPath indexPathForItem:i inSection:0];[newArray addObject:[self layoutAttributesForItemAtIndexPath:indexPath]];}return [newArray copy];
}- (UICollectionViewLayoutAttributes *)layoutAttributesForItemAtIndexPath:(NSIndexPath *)indexPath
{//    NSLog(@"%@", NSStringFromCGSize([self screenSize]));375 667UICollectionViewLayoutAttributes *attris = [UICollectionViewLayoutAttributes layoutAttributesForCellWithIndexPath:indexPath];NSInteger currentRow = indexPath.item / 3;CGRect frame = CGRectMake(20 + (indexPath.item % 3) * (kCellWidth + 17.5), 35+ currentRow * (kCellHeight + 65), kCellWidth, kCellHeight);attris.frame = frame;attris.zIndex = 1;return attris;
}- (UICollectionViewLayoutAttributes *)layoutAttributesForDecorationViewOfKind:(NSString *)decorationViewKind atIndexPath:(NSIndexPath *)indexPath
{id shelfRect = self.bookShelfRectanges[indexPath];// this should never happen, but just in case...if (!shelfRect)return nil;UICollectionViewLayoutAttributes *attributes =[UICollectionViewLayoutAttributes layoutAttributesForDecorationViewOfKind:decorationViewKindwithIndexPath:indexPath];attributes.frame = [shelfRect CGRectValue];//    NSLog(@"UICollectionViewLayoutAttributes :.%@", NSStringFromCGRect([shelfRect CGRectValue]));
    attributes.zIndex = -1; // shelves go behind other viewsreturn attributes;
}- (CGSize)collectionViewContentSize
{CGSize contentSize = CGSizeMake(self.collectionView.bounds.size.width, self.countOfRow * kDecorationViewHeight + 20);return contentSize;
}@end

//
//  FWAncientPoetryCollectionViewController.m
//  FWPersonalApp
//
//  Created by hzkmn on 16/2/17.
//  Copyright © 2016年 ForrstWoo. All rights reserved.
//
#import "FWAncientPoetryCollectionViewController.h"#import "FWBookShelfDecarationView.h"
#import "FWBookshelfCollectionViewLayout.h"
#import "FWBookCategoryViewController.h"@interface FWAncientPoetryCollectionViewController () <LXReorderableCollectionViewDataSource, LXReorderableCollectionViewDelegateFlowLayout>@property (nonatomic, strong) NSMutableArray *books;@end@implementation FWAncientPoetryCollectionViewControllerstatic NSString * const cellReuseIdentifier = @"Cell";
- (void)viewDidLoad {[super viewDidLoad];self.title = @"古籍";self.collectionView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"bookShelfBackground.png"]];[self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:cellReuseIdentifier];self.books = [[NSMutableArray alloc] initWithArray:[self bookNameOfAllBooks]];
}- (NSArray *)bookNameOfAllBooks
{return [[FWDataManager getDataForPoetry] allKeys];
}#pragma mark <UICollectionViewDataSource>- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{return 1;
}- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{return [self.books count];
}- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:cellReuseIdentifier forIndexPath:indexPath];UIImage *image = [UIImage imageNamed:self.books[indexPath.item]];cell.backgroundColor = [UIColor colorWithPatternImage:image];return cell;
}- (void)collectionView:(UICollectionView *)collectionView itemAtIndexPath:(NSIndexPath *)fromIndexPath willMoveToIndexPath:(NSIndexPath *)toIndexPath
{NSString *theBookName = self.books[fromIndexPath.item];[self.books removeObjectAtIndex:fromIndexPath.item];[self.books insertObject:theBookName atIndex:toIndexPath.item];
}#pragma mark - UICollectionViewDelegateFlowLayout- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{return CGSizeMake(kCellWidth, kCellHeight);
}- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{FWBookCategoryViewController *vc = [[FWBookCategoryViewController alloc] initWithUrlString:[[FWDataManager getDataForPoetry] objectForKey:self.books[indexPath.item]]];[self.navigationController pushViewController:vc animated:YES];
}- (void)didReceiveMemoryWarning {[super didReceiveMemoryWarning];[self.books removeAllObjects];self.books = nil;
}@end