KWMNewGoodsCell.m

//
//  KWMNewGoodsCell.m
//  iCemarose
//
//  Created by 陈荣科 on 16/9/1.
//  Copyright © 2016年 kollway. All rights reserved.
//

#import "KWMNewGoodsCell.h"
#import "KWMCollectionCell.h"

@implementation KWMNewGoodsCell{
    NSInteger leftMargin;
}

static NSString *idStr = @"KWMCollectionCell";
- (void)awakeFromNib {
    [super awakeFromNib];
    // Initialization code
    self.selectionStyle = UITableViewCellSelectionStyleNone;
    self.clvNewGoods.decelerationRate = UIScrollViewDecelerationRateFast;
    //   底部渐变
    CAGradientLayer *gradientLy = [self shadowAsInverse:[UIColor redColor]];
    _vWatch.layer.mask = gradientLy;
    [self initCollectionView];
    
}

- (void)initCollectionView{
    self.isSameBrand = NO;
    self.clvNewGoods.delegate = self;
    self.clvNewGoods.backgroundColor = [UIColor clearColor];
    self.clvNewGoods.showsHorizontalScrollIndicator = NO;
    [self.clvNewGoods registerNib:[UINib nibWithNibName:idStr bundle:nil] forCellWithReuseIdentifier:idStr];
    
    UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
    if (_isDetail) {
        leftMargin = 0;
    }else{
        leftMargin = 20;
    }
    layout.minimumLineSpacing = 0;
    layout.minimumInteritemSpacing = 0;
    layout.sectionInset = UIEdgeInsetsMake(40, leftMargin, 35, 0);
    layout.itemSize = CGSizeMake(134, 180);
    layout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
    self.clvNewGoods.collectionViewLayout = layout;
}

- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
    [super setSelected:selected animated:animated];
    
    // Configure the view for the selected state
}

#pragma mark - UICollectionViewDataSource
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
    
    if(self.products && self.products.count>9){
        return 10;
    }
    if(self.products && self.products.count>0){
        return self.products.count;
    }else if(self.loadStatus && self.loadStatus.cacheData){
        return self.loadStatus.cacheData.count;
    }else {
        return 5;
    }
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
    KWMCollectionCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:idStr forIndexPath:indexPath];
    
    cell.isMore = indexPath.row == 9;
    if(self.products && self.products.count>indexPath.row){
        [cell setData:[self.products objectAtIndex:indexPath.row]];
    }else if(self.loadStatus && self.loadStatus.cacheData && self.loadStatus.cacheData.count>indexPath.row){
        [cell setData:[self.loadStatus.cacheData objectAtIndex:indexPath.row]];
    }else{
        [cell setData:nil];
    }
    //如果滑动了后面10个,尝试获取下一页
    if(self.products!=nil && indexPath.row == self.products.count-10 && self.delegate!=nil){
        if ([self.delegate respondsToSelector:@selector(kwm_onNexPage:)]) {
            [self.delegate kwm_onNexPage:self.isSameBrand];
        }
    }
    return cell;
}

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{
    if(indexPath.row == 9){
        if ([self.delegate respondsToSelector:@selector(kwm_onClickMore:)]) {
            [self.delegate kwm_onClickMore:self.isSameBrand];
        }
        return;
    }
    BUYProduct *selectProduct;
    if(self.products!=nil && self.products.count>indexPath.row){
        selectProduct = [self.products objectAtIndex:indexPath.row];
    }else if(self.loadStatus && self.loadStatus.cacheData && self.loadStatus.cacheData.count>indexPath.row){
        selectProduct = [self.loadStatus.cacheData objectAtIndex:indexPath.row];
    }
    if ([self.delegate respondsToSelector:@selector(kwm_selectCollectionCell:)]) {
        [self.delegate kwm_selectCollectionCell:selectProduct];
    }
    NSLog(@"row =  %ld",(long)indexPath.row);
}

- (NSMutableArray *)products {
    if(_products == nil){
        _products = [[NSMutableArray alloc] initWithCapacity:100];
    }
    return _products;
}

-(void)setLoadStatusData:(KWMLoadStatus *) loadStatus{
    if(loadStatus){
        self.loadStatus = loadStatus;
        [self setData:loadStatus.data];
        if(loadStatus.scrollOffset == 0){
            //135为cell的宽度
            NSInteger screen = UI_SCREEN_WIDTH;
            NSInteger scrollIndex = (screen-20) % 135;
            if(scrollIndex<35){
                self.loadStatus.scrollOffset = 135 * 0.2 - scrollIndex;
            }else if(scrollIndex>90){
                self.loadStatus.scrollOffset = 135 * 1.2 - scrollIndex;
            }
        }
        [self.clvNewGoods layoutIfNeeded];
        [self.clvNewGoods setContentOffset:CGPointMake(loadStatus.scrollOffset, 0) animated:NO];
    }else{
        [self setData:nil];
    }
}

-(void)setData:(NSArray *)products{
    [self.products removeAllObjects];
    if(products){
        [self addData:products];
    }
    [self.clvNewGoods reloadData];
}

-(void)addData:(NSArray *)products{
    if(products == nil){
        return;
    }
    [self.products addObjectsFromArray:products];
    [self.clvNewGoods reloadData];
}

-(void)scrollToTop{
    [self.clvNewGoods setContentOffset:CGPointMake(0, 0) animated:NO];
}

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{
    //self.vWatch.hidden = NO;
    self.vWatch.alpha = 1;
    //底部渐变
    CAGradientLayer *gradientLy = [self shadowAsInverse:[UIColor redColor]];
    _vWatch.layer.mask = gradientLy;
}

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{
    //self.vWatch.alpha = 0;
}

- (CAGradientLayer *)shadowAsInverse:(UIColor *)color{
    CAGradientLayer *newShadow = [[CAGradientLayer alloc] init];
    CGRect newShadowFrame = CGRectMake(0, 0, 25, 180);
    newShadow.frame = newShadowFrame;
    newShadow.startPoint = CGPointMake(0, 0);
    newShadow.endPoint = CGPointMake(1, 0);
    //添加渐变的颜色组合（颜色透明度的改变）
    newShadow.colors = [NSArray arrayWithObjects:
                        (id)[[color colorWithAlphaComponent:0.0] CGColor] ,
                        (id)[[color colorWithAlphaComponent:0.8] CGColor],
                        nil];
    return newShadow;
}

-(void)scrollViewDidScroll:(UIScrollView *)scrollView{
    // 实时监测scrollView.contentInset.top， 系统优化以及手动设置contentInset都会影响contentInset.top。
    if(self.loadStatus){
        self.loadStatus.scrollOffset = scrollView.contentOffset.x;
    }
}


@end