//
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// TZPhotoPreviewCell.m
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// TZImagePickerController
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//
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// Created by 谭真 on 15/12/24.
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// Copyright © 2015年 谭真. All rights reserved.
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//
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#import "TZPhotoPreviewCell.h"
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#import "TZAssetModel.h"
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#import "UIView+Layout.h"
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#import "TZImageManager.h"
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#import "TZProgressView.h"
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#import "TZImageCropManager.h"
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@interface TZPhotoPreviewCell ()
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@end
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@implementation TZPhotoPreviewCell
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- (instancetype)initWithFrame:(CGRect)frame {
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self = [super initWithFrame:frame];
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if (self) {
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self.backgroundColor = [UIColor blackColor];
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self.previewView = [[TZPhotoPreviewView alloc] initWithFrame:self.bounds];
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__weak typeof(self) weakSelf = self;
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[self.previewView setSingleTapGestureBlock:^{
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if (weakSelf.singleTapGestureBlock) {
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weakSelf.singleTapGestureBlock();
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}
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}];
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[self.previewView setImageProgressUpdateBlock:^(double progress) {
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if (weakSelf.imageProgressUpdateBlock) {
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weakSelf.imageProgressUpdateBlock(progress);
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}
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}];
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[self addSubview:self.previewView];
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}
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return self;
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}
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- (void)setModel:(TZAssetModel *)model {
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_model = model;
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_previewView.asset = model.asset;
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}
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- (void)recoverSubviews {
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[_previewView recoverSubviews];
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}
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- (void)setAllowCrop:(BOOL)allowCrop {
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_allowCrop = allowCrop;
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_previewView.allowCrop = allowCrop;
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}
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- (void)setCropRect:(CGRect)cropRect {
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_cropRect = cropRect;
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_previewView.cropRect = cropRect;
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}
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@end
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@interface TZPhotoPreviewView ()<UIScrollViewDelegate>
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@end
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@implementation TZPhotoPreviewView
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- (instancetype)initWithFrame:(CGRect)frame {
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self = [super initWithFrame:frame];
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if (self) {
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_scrollView = [[UIScrollView alloc] init];
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_scrollView.frame = CGRectMake(10, 0, self.tz_width - 20, self.tz_height);
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_scrollView.bouncesZoom = YES;
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_scrollView.maximumZoomScale = 2.5;
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_scrollView.minimumZoomScale = 1.0;
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_scrollView.multipleTouchEnabled = YES;
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_scrollView.delegate = self;
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_scrollView.scrollsToTop = NO;
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_scrollView.showsHorizontalScrollIndicator = NO;
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_scrollView.showsVerticalScrollIndicator = NO;
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_scrollView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
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_scrollView.delaysContentTouches = NO;
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_scrollView.canCancelContentTouches = YES;
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_scrollView.alwaysBounceVertical = NO;
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[self addSubview:_scrollView];
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_imageContainerView = [[UIView alloc] init];
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_imageContainerView.clipsToBounds = YES;
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_imageContainerView.contentMode = UIViewContentModeScaleAspectFill;
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[_scrollView addSubview:_imageContainerView];
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_imageView = [[UIImageView alloc] init];
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_imageView.backgroundColor = [UIColor colorWithWhite:1.000 alpha:0.500];
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_imageView.contentMode = UIViewContentModeScaleAspectFill;
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_imageView.clipsToBounds = YES;
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[_imageContainerView addSubview:_imageView];
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UITapGestureRecognizer *tap1 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleTap:)];
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[self addGestureRecognizer:tap1];
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UITapGestureRecognizer *tap2 = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleTap:)];
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tap2.numberOfTapsRequired = 2;
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[tap1 requireGestureRecognizerToFail:tap2];
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[self addGestureRecognizer:tap2];
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[self configProgressView];
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}
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return self;
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}
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- (void)configProgressView {
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_progressView = [[TZProgressView alloc] init];
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static CGFloat progressWH = 40;
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CGFloat progressX = (self.tz_width - progressWH) / 2;
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CGFloat progressY = (self.tz_height - progressWH) / 2;
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_progressView.frame = CGRectMake(progressX, progressY, progressWH, progressWH);
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_progressView.hidden = YES;
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[self addSubview:_progressView];
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}
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- (void)setModel:(TZAssetModel *)model {
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_model = model;
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[_scrollView setZoomScale:1.0 animated:NO];
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if (model.type == TZAssetModelMediaTypePhotoGif) {
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[[TZImageManager manager] getOriginalPhotoDataWithAsset:model.asset completion:^(NSData *data, NSDictionary *info, BOOL isDegraded) {
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if (!isDegraded) {
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self.imageView.image = [UIImage sd_tz_animatedGIFWithData:data];
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[self resizeSubviews];
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}
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}];
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} else {
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self.asset = model.asset;
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}
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}
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- (void)setAsset:(id)asset {
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_asset = asset;
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[[TZImageManager manager] getPhotoWithAsset:asset completion:^(UIImage *photo, NSDictionary *info, BOOL isDegraded) {
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self.imageView.image = photo;
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[self resizeSubviews];
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_progressView.hidden = YES;
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if (self.imageProgressUpdateBlock) {
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self.imageProgressUpdateBlock(1);
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}
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} progressHandler:^(double progress, NSError *error, BOOL *stop, NSDictionary *info) {
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_progressView.hidden = NO;
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[self bringSubviewToFront:_progressView];
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progress = progress > 0.02 ? progress : 0.02;;
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_progressView.progress = progress;
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if (self.imageProgressUpdateBlock) {
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self.imageProgressUpdateBlock(progress);
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}
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} networkAccessAllowed:YES];
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}
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- (void)recoverSubviews {
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[_scrollView setZoomScale:1.0 animated:NO];
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[self resizeSubviews];
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}
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- (void)resizeSubviews {
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_imageContainerView.tz_origin = CGPointZero;
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_imageContainerView.tz_width = self.scrollView.tz_width;
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UIImage *image = _imageView.image;
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if (image.size.height / image.size.width > self.tz_height / self.scrollView.tz_width) {
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_imageContainerView.tz_height = floor(image.size.height / (image.size.width / self.scrollView.tz_width));
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} else {
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CGFloat height = image.size.height / image.size.width * self.scrollView.tz_width;
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if (height < 1 || isnan(height)) height = self.tz_height;
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height = floor(height);
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_imageContainerView.tz_height = height;
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_imageContainerView.tz_centerY = self.tz_height / 2;
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}
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if (_imageContainerView.tz_height > self.tz_height && _imageContainerView.tz_height - self.tz_height <= 1) {
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_imageContainerView.tz_height = self.tz_height;
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}
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CGFloat contentSizeH = MAX(_imageContainerView.tz_height, self.tz_height);
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_scrollView.contentSize = CGSizeMake(self.scrollView.tz_width, contentSizeH);
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[_scrollView scrollRectToVisible:self.bounds animated:NO];
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_scrollView.alwaysBounceVertical = _imageContainerView.tz_height <= self.tz_height ? NO : YES;
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_imageView.frame = _imageContainerView.bounds;
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[self refreshScrollViewContentSize];
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}
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- (void)setAllowCrop:(BOOL)allowCrop {
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_allowCrop = allowCrop;
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_scrollView.maximumZoomScale = allowCrop ? 4.0 : 2.5;
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}
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- (void)refreshScrollViewContentSize {
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if (_allowCrop) {
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// 1.7.2 如果允许裁剪,需要让图片的任意部分都能在裁剪框内，于是对_scrollView做了如下处理：
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// 1.让contentSize增大(裁剪框右下角的图片部分)
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CGFloat contentWidthAdd = self.scrollView.tz_width - CGRectGetMaxX(_cropRect);
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CGFloat contentHeightAdd = (MIN(_imageContainerView.tz_height, self.tz_height) - self.cropRect.size.height) / 2;
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CGFloat newSizeW = self.scrollView.contentSize.width + contentWidthAdd;
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CGFloat newSizeH = MAX(self.scrollView.contentSize.height, self.tz_height) + contentHeightAdd;
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_scrollView.contentSize = CGSizeMake(newSizeW, newSizeH);
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_scrollView.alwaysBounceVertical = YES;
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// 2.让scrollView新增滑动区域（裁剪框左上角的图片部分）
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if (contentHeightAdd > 0) {
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_scrollView.contentInset = UIEdgeInsetsMake(contentHeightAdd, _cropRect.origin.x, 0, 0);
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} else {
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_scrollView.contentInset = UIEdgeInsetsZero;
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}
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}
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}
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#pragma mark - UITapGestureRecognizer Event
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- (void)doubleTap:(UITapGestureRecognizer *)tap {
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if (_scrollView.zoomScale > 1.0) {
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_scrollView.contentInset = UIEdgeInsetsZero;
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[_scrollView setZoomScale:1.0 animated:YES];
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} else {
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CGPoint touchPoint = [tap locationInView:self.imageView];
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CGFloat newZoomScale = _scrollView.maximumZoomScale;
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CGFloat xsize = self.frame.size.width / newZoomScale;
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CGFloat ysize = self.frame.size.height / newZoomScale;
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[_scrollView zoomToRect:CGRectMake(touchPoint.x - xsize/2, touchPoint.y - ysize/2, xsize, ysize) animated:YES];
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}
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}
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- (void)singleTap:(UITapGestureRecognizer *)tap {
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if (self.singleTapGestureBlock) {
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self.singleTapGestureBlock();
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}
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}
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#pragma mark - UIScrollViewDelegate
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- (nullable UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {
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return _imageContainerView;
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}
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- (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view {
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scrollView.contentInset = UIEdgeInsetsZero;
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}
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- (void)scrollViewDidZoom:(UIScrollView *)scrollView {
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[self refreshImageContainerViewCenter];
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}
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- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale {
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[self refreshScrollViewContentSize];
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}
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#pragma mark - Private
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- (void)refreshImageContainerViewCenter {
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CGFloat offsetX = (_scrollView.tz_width > _scrollView.contentSize.width) ? ((_scrollView.tz_width - _scrollView.contentSize.width) * 0.5) : 0.0;
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CGFloat offsetY = (_scrollView.tz_height > _scrollView.contentSize.height) ? ((_scrollView.tz_height - _scrollView.contentSize.height) * 0.5) : 0.0;
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self.imageContainerView.center = CGPointMake(_scrollView.contentSize.width * 0.5 + offsetX, _scrollView.contentSize.height * 0.5 + offsetY);
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}
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@end
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