react-native/Libraries/Image/RCTShadowVirtualImage.m

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/**
* Copyright (c) 2015-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 "RCTShadowVirtualImage.h"
#import "RCTImageLoader.h"
#import "RCTImageUtils.h"
#import "RCTBridge.h"
#import "RCTConvert.h"
#import "RCTUIManager.h"
#import "RCTUtils.h"
@implementation RCTShadowVirtualImage
{
RCTBridge *_bridge;
RCTImageLoaderCancellationBlock _cancellationBlock;
}
@synthesize image = _image;
- (instancetype)initWithBridge:(RCTBridge *)bridge
{
if ((self = [super init])) {
_bridge = bridge;
}
return self;
}
RCT_NOT_IMPLEMENTED(-(instancetype)init)
- (void)didSetProps:(NSArray<NSString *> *)changedProps
{
[super didSetProps:changedProps];
if (changedProps.count == 0) {
// No need to reload image
return;
}
// Cancel previous request
if (_cancellationBlock) {
_cancellationBlock();
}
CGSize imageSize = {
RCTZeroIfNaN(self.width),
RCTZeroIfNaN(self.height),
};
if (!_image) {
_image = RCTGetPlaceholderImage(imageSize, nil);
}
__weak RCTShadowVirtualImage *weakSelf = self;
_cancellationBlock = [_bridge.imageLoader loadImageWithTag:_source.imageURL.absoluteString
size:imageSize
scale:RCTScreenScale()
resizeMode:_resizeMode
progressBlock:nil
completionBlock:^(NSError *error, UIImage *image) {
dispatch_async(_bridge.uiManager.methodQueue, ^{
RCTShadowVirtualImage *strongSelf = weakSelf;
if (![_source isEqual:strongSelf.source]) {
// Bail out if source has changed since we started loading
return;
}
strongSelf->_image = image;
[strongSelf dirtyText];
});
}];
}
- (void)dealloc
{
if (_cancellationBlock) {
_cancellationBlock();
}
}
@end