81 строка
3.1 KiB
Objective-C
81 строка
3.1 KiB
Objective-C
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#import <UIKit/UIKit.h>
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#import <React/RCTBridge.h>
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#import <React/RCTResizeMode.h>
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NS_ASSUME_NONNULL_BEGIN
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typedef void (^RCTImageLoaderProgressBlock)(int64_t progress, int64_t total);
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typedef void (^RCTImageLoaderPartialLoadBlock)(UIImage *image);
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typedef void (^RCTImageLoaderCompletionBlock)(NSError * _Nullable error, UIImage * _Nullable image);
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// Metadata is passed as a id in an additional parameter because there are forks of RN without this parameter,
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// and the complexity of RCTImageLoader would make using protocols here difficult to typecheck.
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typedef void (^RCTImageLoaderCompletionBlockWithMetadata)(NSError * _Nullable error, UIImage * _Nullable image, id _Nullable metadata);
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typedef dispatch_block_t RCTImageLoaderCancellationBlock;
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/**
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* Provides the interface needed to register an image loader. Image data
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* loaders are also bridge modules, so should be registered using
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* RCT_EXPORT_MODULE().
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*/
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@protocol RCTImageURLLoader <RCTBridgeModule>
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/**
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* Indicates whether this data loader is capable of processing the specified
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* request URL. Typically the handler would examine the scheme/protocol of the
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* URL to determine this.
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*/
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- (BOOL)canLoadImageURL:(NSURL *)requestURL;
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/**
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* Send a network request to load the request URL. The method should call the
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* progressHandler (if applicable) and the completionHandler when the request
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* has finished. The method should also return a cancellation block, if
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* applicable.
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*/
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- (nullable RCTImageLoaderCancellationBlock)loadImageForURL:(NSURL *)imageURL
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size:(CGSize)size
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scale:(CGFloat)scale
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resizeMode:(RCTResizeMode)resizeMode
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progressHandler:(RCTImageLoaderProgressBlock)progressHandler
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partialLoadHandler:(RCTImageLoaderPartialLoadBlock)partialLoadHandler
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completionHandler:(RCTImageLoaderCompletionBlock)completionHandler;
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@optional
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/**
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* If more than one RCTImageURLLoader responds YES to `-canLoadImageURL:`
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* then `loaderPriority` is used to determine which one to use. The loader
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* with the highest priority will be selected. Default priority is zero. If
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* two or more valid loaders have the same priority, the selection order is
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* undefined.
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*/
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- (float)loaderPriority;
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/**
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* If the loader must be called on the serial url cache queue, and whether the completion
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* block should be dispatched off the main thread. If this is NO, the loader will be
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* called from the main queue. Defaults to YES.
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*
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* Use with care: disabling scheduling will reduce RCTImageLoader's ability to throttle
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* network requests.
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*/
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- (BOOL)requiresScheduling;
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/**
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* If images loaded by the loader should be cached in the decoded image cache.
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* Defaults to YES.
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*/
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- (BOOL)shouldCacheLoadedImages;
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@end
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NS_ASSUME_NONNULL_END
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