jixin_new/shiku_im/3rd/SDWebImage/UIView+WebCacheOperation.m

/*
 * This file is part of the SDWebImage package.
 * (c) Olivier Poitrey <rs@dailymotion.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

#import "UIView+WebCacheOperation.h"

#if SD_UIKIT || SD_MAC

#import "objc/runtime.h"

static char loadOperationKey;

typedef NSMutableDictionary<NSString *, id> SDOperationsDictionary;

@implementation UIView (WebCacheOperation)

- (SDOperationsDictionary *)operationDictionary {
//    SDOperationsDictionary *operations = objc_getAssociatedObject(self, &loadOperationKey);
//    if (operations) {
//        return operations;
//    }
//    operations = [NSMutableDictionary dictionary];
//    objc_setAssociatedObject(self, &loadOperationKey, operations, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
//    return operations;
    @synchronized(self) {
        SDOperationsDictionary *operations = objc_getAssociatedObject(self, &loadOperationKey);
        if (operations) {
            return operations;
        }
        operations = [[NSMapTable alloc] initWithKeyOptions:NSPointerFunctionsStrongMemory valueOptions:NSPointerFunctionsWeakMemory capacity:0];
        objc_setAssociatedObject(self, &loadOperationKey, operations, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
        return operations;
    }
}

- (void)sd_setImageLoadOperation:(nullable id)operation forKey:(nullable NSString *)key {
//    if (key) {
//        [self sd_cancelImageLoadOperationWithKey:key];
//        if (operation) {
//            SDOperationsDictionary *operationDictionary = [self operationDictionary];
//            operationDictionary[key] = operation;
//        }
//    }
    if (key) {
        [self sd_cancelImageLoadOperationWithKey:key];
        if (operation) {
            SDOperationsDictionary *operationDictionary = [self operationDictionary];
            @synchronized (self) {
                [operationDictionary setObject:operation forKey:key];
            }
        }
    }
}

- (void)sd_cancelImageLoadOperationWithKey:(nullable NSString *)key {
    // Cancel in progress downloader from queue
//    SDOperationsDictionary *operationDictionary = [self operationDictionary];
//    id operations = operationDictionary[key];
//    if (operations) {
//        if ([operations isKindOfClass:[NSArray class]]) {
//            for (id <SDWebImageOperation> operation in operations) {
//                if (operation) {
//                    [operation cancel];
//                }
//            }
//        } else if ([operations conformsToProtocol:@protocol(SDWebImageOperation)]){
//            [(id<SDWebImageOperation>) operations cancel];
//        }
//        [operationDictionary removeObjectForKey:key];
//    }
    if (key) {
        // Cancel in progress downloader from queue
        SDOperationsDictionary *operationDictionary = [self operationDictionary];
        id<SDWebImageOperation> operation;
        
        @synchronized (self) {
            operation = [operationDictionary objectForKey:key];
        }
        if (operation) {
            if ([operation conformsToProtocol:@protocol(SDWebImageOperation)]) {
                [operation cancel];
            }
            @synchronized (self) {
                [operationDictionary removeObjectForKey:key];
            }
        }
    }
}

- (void)sd_removeImageLoadOperationWithKey:(nullable NSString *)key {
    if (key) {
        SDOperationsDictionary *operationDictionary = [self operationDictionary];
        [operationDictionary removeObjectForKey:key];
    }
}

@end

#endif