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/* Copyright (c) 2014-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
#import "ASNetworkImageNode.h"
#import "ASBasicImageDownloader.h"
#import "ASDisplayNode+Subclasses.h"
#import "ASThread.h"
#import "ASEqualityHelpers.h"
@interface ASNetworkImageNode ()
{
ASDN::RecursiveMutex _lock;
__weak id<ASImageCacheProtocol> _cache;
__weak id<ASImageDownloaderProtocol> _downloader;
// Only access any of these with _lock.
__weak id<ASNetworkImageNodeDelegate> _delegate;
NSURL *_URL;
UIImage *_defaultImage;
NSUUID *_cacheUUID;
id _imageDownload;
BOOL _imageLoaded;
}
@end
@implementation ASNetworkImageNode
- (instancetype)initWithCache:(id<ASImageCacheProtocol>)cache downloader:(id<ASImageDownloaderProtocol>)downloader
{
if (!(self = [super init]))
return nil;
_cache = cache;
_downloader = downloader;
_shouldCacheImage = YES;
self.shouldBypassEnsureDisplay = YES;
return self;
}
- (instancetype)init
{
return [self initWithCache:nil downloader:[ASBasicImageDownloader sharedImageDownloader]];
}
- (void)dealloc
{
[self _cancelImageDownload];
}
#pragma mark - Public methods -- must lock
- (void)setURL:(NSURL *)URL
{
[self setURL:URL resetToDefault:YES];
}
- (void)setURL:(NSURL *)URL resetToDefault:(BOOL)reset
{
ASDN::MutexLocker l(_lock);
if (ASObjectIsEqual(URL, _URL)) {
return;
}
[self _cancelImageDownload];
_imageLoaded = NO;
_URL = URL;
if (reset || _URL == nil)
self.image = _defaultImage;
if (self.nodeLoaded && self.layer.superlayer)
[self _lazilyLoadImageIfNecessary];
}
- (NSURL *)URL
{
ASDN::MutexLocker l(_lock);
return _URL;
}
- (void)setDefaultImage:(UIImage *)defaultImage
{
ASDN::MutexLocker l(_lock);
if (ASObjectIsEqual(defaultImage, _defaultImage)) {
return;
}
_defaultImage = defaultImage;
if (!_imageLoaded) {
self.image = _defaultImage;
}
}
- (UIImage *)defaultImage
{
ASDN::MutexLocker l(_lock);
return _defaultImage;
}
- (void)setDelegate:(id<ASNetworkImageNodeDelegate>)delegate
{
ASDN::MutexLocker l(_lock);
_delegate = delegate;
}
- (id<ASNetworkImageNodeDelegate>)delegate
{
ASDN::MutexLocker l(_lock);
return _delegate;
}
- (void)displayWillStart
{
[super displayWillStart];
[self fetchData];
}
- (void)clearFetchedData
{
[super clearFetchedData];
{
ASDN::MutexLocker l(_lock);
[self _cancelImageDownload];
self.image = _defaultImage;
_imageLoaded = NO;
}
}
- (void)fetchData
{
[super fetchData];
{
ASDN::MutexLocker l(_lock);
[self _lazilyLoadImageIfNecessary];
}
}
#pragma mark - Private methods -- only call with lock.
- (void)_cancelImageDownload
{
if (!_imageDownload) {
return;
}
[_downloader cancelImageDownloadForIdentifier:_imageDownload];
_imageDownload = nil;
_cacheUUID = nil;
}
- (void)_downloadImageWithCompletion:(void (^)(CGImageRef))finished
{
_imageDownload = [_downloader downloadImageWithURL:_URL
callbackQueue:dispatch_get_main_queue()
downloadProgressBlock:NULL
completion:^(CGImageRef responseImage, NSError *error) {
if (finished != NULL) {
finished(responseImage);
}
}];
}
- (void)_lazilyLoadImageIfNecessary
{
if (!_imageLoaded && _URL != nil && _imageDownload == nil) {
if (_URL.isFileURL) {
{
ASDN::MutexLocker l(_lock);
dispatch_async(dispatch_get_main_queue(), ^{
_imageLoaded = YES;
if (self.shouldCacheImage) {
self.image = [UIImage imageNamed:_URL.path];
} else {
self.image = [UIImage imageWithContentsOfFile:_URL.path];
}
[_delegate imageNode:self didLoadImage:self.image];
});
}
} else {
__weak __typeof__(self) weakSelf = self;
void (^finished)(CGImageRef) = ^(CGImageRef responseImage) {
__typeof__(self) strongSelf = weakSelf;
if (strongSelf == nil) {
return;
}
{
ASDN::MutexLocker l(strongSelf->_lock);
if (responseImage != NULL) {
strongSelf->_imageLoaded = YES;
strongSelf.image = [UIImage imageWithCGImage:responseImage];
}
strongSelf->_imageDownload = nil;
strongSelf->_cacheUUID = nil;
}
if (responseImage != NULL) {
[strongSelf->_delegate imageNode:strongSelf didLoadImage:strongSelf.image];
}
};
if (_cache != nil) {
NSUUID *cacheUUID = [NSUUID UUID];
_cacheUUID = cacheUUID;
void (^cacheCompletion)(CGImageRef) = ^(CGImageRef image) {
// If the cache UUID changed, that means this request was cancelled.
if (![_cacheUUID isEqual:cacheUUID]) {
return;
}
if (image == NULL && _downloader != nil) {
[self _downloadImageWithCompletion:finished];
} else {
finished(image);
}
};
[_cache fetchCachedImageWithURL:_URL
callbackQueue:dispatch_get_main_queue()
completion:cacheCompletion];
} else {
[self _downloadImageWithCompletion:finished];
}
}
}
}
#pragma mark - ASDisplayNode+Subclasses
- (void)asyncdisplaykit_asyncTransactionContainerStateDidChange
{
if (self.asyncdisplaykit_asyncTransactionContainerState == ASAsyncTransactionContainerStateNoTransactions) {
if (self.layer.contents != nil && [self.delegate respondsToSelector:@selector(imageNodeDidFinishDecoding:)]) {
[self.delegate imageNodeDidFinishDecoding:self];
}
}
}
@end