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/*
* 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 "SDWebImageDownloader.h"
NSString *const SDWebImageDownloadStartNotification = @"SDWebImageDownloadStartNotification";
NSString *const SDWebImageDownloadStopNotification = @"SDWebImageDownloadStopNotification";
@interface SDWebImageDownloader ()
@property (nonatomic, retain) NSURLConnection *connection;
@end
@implementation SDWebImageDownloader
@synthesize url, delegate, connection, imageData, userInfo, lowPriority;
#pragma mark Public Methods
+ (id)downloaderWithURL:(NSURL *)url delegate:(id<SDWebImageDownloaderDelegate>)delegate
{
return [[self class] downloaderWithURL:url delegate:delegate userInfo:nil];
}
+ (id)downloaderWithURL:(NSURL *)url delegate:(id<SDWebImageDownloaderDelegate>)delegate userInfo:(id)userInfo
{
return [[self class] downloaderWithURL:url delegate:delegate userInfo:userInfo lowPriority:NO];
}
+ (id)downloaderWithURL:(NSURL *)url delegate:(id<SDWebImageDownloaderDelegate>)delegate userInfo:(id)userInfo lowPriority:(BOOL)lowPriority
{
// Bind SDNetworkActivityIndicator if available (download it here: http://github.com/rs/SDNetworkActivityIndicator )
// To use it, just add #import "SDNetworkActivityIndicator.h" in addition to the SDWebImage import
if (NSClassFromString(@"SDNetworkActivityIndicator"))
{
id activityIndicator = [NSClassFromString(@"SDNetworkActivityIndicator") performSelector:NSSelectorFromString(@"sharedActivityIndicator")];
[[NSNotificationCenter defaultCenter] addObserver:activityIndicator
selector:NSSelectorFromString(@"startActivity")
name:SDWebImageDownloadStartNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:activityIndicator
selector:NSSelectorFromString(@"stopActivity")
name:SDWebImageDownloadStopNotification object:nil];
}
SDWebImageDownloader *downloader = [[[SDWebImageDownloader alloc] init] autorelease];
downloader.url = url;
downloader.delegate = delegate;
downloader.userInfo = userInfo;
downloader.lowPriority = lowPriority;
[downloader performSelectorOnMainThread:@selector(start) withObject:nil waitUntilDone:YES];
return downloader;
}
+ (void)setMaxConcurrentDownloads:(NSUInteger)max
{
// NOOP
}
- (void)start
{
// In order to prevent from potential duplicate caching (NSURLCache + SDImageCache) we disable the cache for image requests
NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:15];
self.connection = [[[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:NO] autorelease];
// If not in low priority mode, ensure we aren't blocked by UI manipulations (default runloop mode for NSURLConnection is NSEventTrackingRunLoopMode)
if (!lowPriority)
{
[connection scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSRunLoopCommonModes];
}
[connection start];
[request release];
if (connection)
{
self.imageData = [NSMutableData data];
[[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadStartNotification object:nil];
}
else
{
if ([delegate respondsToSelector:@selector(imageDownloader:didFailWithError:)])
{
[delegate performSelector:@selector(imageDownloader:didFailWithError:) withObject:self withObject:nil];
}
}
}
- (void)cancel
{
if (connection)
{
[connection cancel];
self.connection = nil;
[[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadStopNotification object:nil];
}
}
#pragma mark NSURLConnection (delegate)
- (void)connection:(NSURLConnection *)aConnection didReceiveData:(NSData *)data
{
[imageData appendData:data];
}
#pragma GCC diagnostic ignored "-Wundeclared-selector"
- (void)connectionDidFinishLoading:(NSURLConnection *)aConnection
{
self.connection = nil;
[[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadStopNotification object:nil];
if ([delegate respondsToSelector:@selector(imageDownloaderDidFinish:)])
{
[delegate performSelector:@selector(imageDownloaderDidFinish:) withObject:self];
}
if ([delegate respondsToSelector:@selector(imageDownloader:didFinishWithImage:)])
{
UIImage *image = [[UIImage alloc] initWithData:imageData];
[delegate performSelector:@selector(imageDownloader:didFinishWithImage:) withObject:self withObject:image];
[image release];
}
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
[[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadStopNotification object:nil];
if ([delegate respondsToSelector:@selector(imageDownloader:didFailWithError:)])
{
[delegate performSelector:@selector(imageDownloader:didFailWithError:) withObject:self withObject:error];
}
self.connection = nil;
self.imageData = nil;
}
#pragma mark NSObject
- (void)dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self];
[url release], url = nil;
[connection release], connection = nil;
[imageData release], imageData = nil;
[userInfo release], userInfo = nil;
[super dealloc];
}
@end
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