//
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// LMJVerticalFlowLayout.h
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// 瀑布流完善接口
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//
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// Created by apple on 16/7/31.
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// Copyright © 2016年 NJHu. All rights reserved.
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//
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#import <UIKit/UIKit.h>
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@class LMJVerticalFlowLayout;
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@protocol LMJVerticalFlowLayoutDelegate <NSObject>
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@required
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/**
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* 要求实现
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*
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* @param waterflowLayout 哪个布局需要代理返回高度
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* @param indexPath 对应的cell, 的indexPath, 但是indexPath.section == 0
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* @param width layout内部计算的宽度
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*
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* @return 需要代理高度对应的cell的高度
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*/
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- (CGFloat)waterflowLayout:(LMJVerticalFlowLayout *)waterflowLayout collectionView:(UICollectionView *)collectionView heightForItemAtIndexPath:(NSIndexPath *)indexPath itemWidth:(CGFloat)itemWidth;
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@optional
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/**
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* 需要显示的列数, 默认3
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*/
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- (NSInteger)waterflowLayout:(LMJVerticalFlowLayout *)waterflowLayout columnsInCollectionView:(UICollectionView *)collectionView;
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/**
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* 列间距, 默认10
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*/
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- (CGFloat)waterflowLayout:(LMJVerticalFlowLayout *)waterflowLayout columnsMarginInCollectionView:(UICollectionView *)collectionView;
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/**
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* 行间距, 默认10
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*/
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- (CGFloat)waterflowLayout:(LMJVerticalFlowLayout *)waterflowLayout collectionView:(UICollectionView *)collectionView linesMarginForItemAtIndexPath:(NSIndexPath *)indexPath;
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/**
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* 距离collectionView四周的间距, 默认{20, 10, 10, 10}
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*/
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- (UIEdgeInsets)waterflowLayout:(LMJVerticalFlowLayout *)waterflowLayout edgeInsetsInCollectionView:(UICollectionView *)collectionView;
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@end
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@interface LMJVerticalFlowLayout : UICollectionViewLayout
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/** layout的代理 */
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- (instancetype)initWithDelegate:(id<LMJVerticalFlowLayoutDelegate>)delegate;
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+ (instancetype)flowLayoutWithDelegate:(id<LMJVerticalFlowLayoutDelegate>)delegate;
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@end
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