118 lines
3.7 KiB
Objective-C
118 lines
3.7 KiB
Objective-C
// Copyright 2004-present Facebook. All Rights Reserved.
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#import "RCTNetworkImageView.h"
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#import "RCTImageDownloader.h"
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#import "RCTUtils.h"
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#import "RCTConvert.h"
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@implementation RCTNetworkImageView
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{
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BOOL _deferred;
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NSURL *_imageURL;
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NSURL *_deferredImageURL;
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NSUInteger _deferSentinel;
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RCTImageDownloader *_imageDownloader;
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id _downloadToken;
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}
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- (instancetype)initWithFrame:(CGRect)frame imageDownloader:(RCTImageDownloader *)imageDownloader
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{
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self = [super initWithFrame:frame];
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if (self) {
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_deferSentinel = 0;
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_imageDownloader = imageDownloader;
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self.userInteractionEnabled = NO;
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}
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return self;
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}
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- (NSURL *)imageURL
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{
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// We clear our backing layer's imageURL when we are not in a window for a while,
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// to make sure we don't consume network resources while offscreen.
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// However we don't want to expose this hackery externally.
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return _deferred ? _deferredImageURL : _imageURL;
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}
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- (void)setImageURL:(NSURL *)imageURL resetToDefaultImageWhileLoading:(BOOL)reset
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{
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if (_deferred) {
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_deferredImageURL = imageURL;
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} else {
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if (_downloadToken) {
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[_imageDownloader cancelDownload:_downloadToken];
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_downloadToken = nil;
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}
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if (reset) {
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self.layer.contentsScale = _defaultImage.scale;
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self.layer.contents = (__bridge id)_defaultImage.CGImage;
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self.layer.minificationFilter = kCAFilterTrilinear;
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self.layer.magnificationFilter = kCAFilterTrilinear;
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}
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if ([imageURL.pathExtension caseInsensitiveCompare:@"gif"] == NSOrderedSame) {
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_downloadToken = [_imageDownloader downloadDataForURL:imageURL block:^(NSData *data, NSError *error) {
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if (data) {
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CAKeyframeAnimation *animation = [RCTConvert GIF:data];
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CGImageRef firstFrame = (__bridge CGImageRef)animation.values.firstObject;
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self.layer.bounds = CGRectMake(0, 0, CGImageGetWidth(firstFrame), CGImageGetHeight(firstFrame));
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self.layer.contentsScale = 1.0;
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self.layer.contentsGravity = kCAGravityResizeAspect;
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self.layer.minificationFilter = kCAFilterLinear;
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self.layer.magnificationFilter = kCAFilterLinear;
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[self.layer addAnimation:animation forKey:@"contents"];
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}
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// TODO: handle errors
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}];
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} else {
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_downloadToken = [_imageDownloader downloadImageForURL:imageURL size:self.bounds.size scale:RCTScreenScale() block:^(UIImage *image, NSError *error) {
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if (image) {
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self.layer.contentsScale = image.scale;
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self.layer.contents = (__bridge id)image.CGImage;
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}
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// TODO: handle errors
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}];
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}
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}
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}
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- (void)setImageURL:(NSURL *)imageURL
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{
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[self setImageURL:imageURL resetToDefaultImageWhileLoading:YES];
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}
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- (void)willMoveToWindow:(UIWindow *)newWindow
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{
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[super willMoveToWindow:newWindow];
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if (newWindow != nil && _deferredImageURL) {
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// Immediately exit deferred mode and restore the imageURL that we saved when we went offscreen.
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[self setImageURL:_deferredImageURL resetToDefaultImageWhileLoading:YES];
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_deferredImageURL = nil;
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}
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}
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- (void)_enterDeferredModeIfNeededForSentinel:(NSUInteger)sentinel
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{
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if (self.window == nil && _deferSentinel == sentinel) {
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_deferred = YES;
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[_imageDownloader cancelDownload:_downloadToken];
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_downloadToken = nil;
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_deferredImageURL = _imageURL;
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_imageURL = nil;
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}
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}
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- (void)didMoveToWindow
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{
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[super didMoveToWindow];
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if (self.window == nil) {
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__weak RCTNetworkImageView *weakSelf = self;
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NSUInteger sentinelAtDispatchTime = ++_deferSentinel;
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dispatch_after(dispatch_time(DISPATCH_TIME_NOW, NSEC_PER_SEC), dispatch_get_main_queue(), ^(void){
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[weakSelf _enterDeferredModeIfNeededForSentinel:sentinelAtDispatchTime];
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});
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}
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}
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@end
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