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Start downloading images when multiplex node is displayed

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fixes #178
This commit is contained in:
Ryan Nystrom
2015-01-07 16:18:48 -08:00
parent bacfcbd24d
commit ae1349eb16
3 changed files with 25 additions and 44 deletions
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45
AsyncDisplayKit/ASMultiplexImageNode.mm
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@@ -70,7 +70,6 @@ typedef void(^ASMultiplexImageLoadCompletionBlock)(UIImage *image, id imageIdent
// Networking.
id _downloadIdentifier;
BOOL _canceledImageDownload;
}
//! @abstract Read-write redeclaration of property declared in ASMultiplexImageNode.h.
@@ -79,16 +78,6 @@ typedef void(^ASMultiplexImageLoadCompletionBlock)(UIImage *image, id imageIdent
//! @abstract The image identifier that's being loaded by _loadNextImageWithCompletion:.
@property (nonatomic, readwrite, copy) id loadingImageIdentifier;
/**
@abstract Indicates whether a change from one array of image identifiers to another should prompt the receiver to update its loaded image.
@param loadedIdentifier The image identifier that's currently loaded, or nil if no identifier is loaded yet.
@param loadingImageIdentifier The image identifier that's currently loading, or nil if no identifier is loading.
@param oldIdentifiers An array of image identifiers that were previously managed, or nil if no identifiers were managed before.
@param newIdentifiers The array of new image identifiers.
@result YES if the receiver should update its loaded image as a consequence of the newly assigned identifiers; NO otherwise.
*/
static inline BOOL _shouldUpdateAfterChangedImageIdentifiers(id loadedIdentifier, id loadingImageIdentifier, NSArray *oldIdentifiers, NSArray *newIdentifiers);
/**
@abstract Returns the next image identifier that should be downloaded.
@discussion This method obeys and reflects the value of `downloadsIntermediateImages`.
@@ -180,7 +169,6 @@ static inline BOOL _shouldUpdateAfterChangedImageIdentifiers(id loadedIdentifier
if (_downloadIdentifier) {
[_downloader cancelImageDownloadForIdentifier:_downloadIdentifier];
_downloadIdentifier = nil;
_canceledImageDownload = YES;
}
}
@@ -188,10 +176,7 @@ static inline BOOL _shouldUpdateAfterChangedImageIdentifiers(id loadedIdentifier
{
[super displayWillStart];
if(_canceledImageDownload) {
[self _updatedImageIdentifiers];
_canceledImageDownload = NO;
}
[self _loadImageIdentifiers];
}
- (void)displayDidFinish
@@ -268,24 +253,16 @@ static inline BOOL _shouldUpdateAfterChangedImageIdentifiers(id loadedIdentifier
OSSpinLockUnlock(&_imageIdentifiersLock);
return;
}
NSArray *oldImageIdentifiers = [[NSArray alloc] initWithArray:_imageIdentifiers];
_imageIdentifiers = [imageIdentifiers copy];
// Kick off image loading and display, if the identifiers have substantively changed.
BOOL shouldUpdateAfterChangedImageIdentifiers = _shouldUpdateAfterChangedImageIdentifiers(self.loadedImageIdentifier, self.loadingImageIdentifier, oldImageIdentifiers, _imageIdentifiers);
OSSpinLockUnlock(&_imageIdentifiersLock);
if (shouldUpdateAfterChangedImageIdentifiers) {
[self _updatedImageIdentifiers];
}
}
- (void)reloadImageIdentifierSources
{
[self _updatedImageIdentifiers];
// setting this to nil makes the node think it has not downloaded any images
_loadedImageIdentifier = nil;
[self _loadImageIdentifiers];
}
#pragma mark -
@@ -325,18 +302,10 @@ static inline BOOL _shouldUpdateAfterChangedImageIdentifiers(id loadedIdentifier
_downloadIdentifier = downloadIdentifier;
}
#pragma mark - Image Loading Machinery
static inline BOOL _shouldUpdateAfterChangedImageIdentifiers(id loadedIdentifier, id loadingImageIdentifier, NSArray *oldIdentifiers, NSArray *newIdentifiers)
{
// If we're loading an identifier, we need to update if it isn't permitted to load anymore.
if (loadingImageIdentifier)
return ![newIdentifiers containsObject:loadingImageIdentifier];
// We're not loading, so we need to update unless we've already loaded the best identifier.
return ![[newIdentifiers firstObject] isEqual:loadedIdentifier];
}
- (void)_updatedImageIdentifiers
- (void)_loadImageIdentifiers
{
// Kill any in-flight downloads.
[self _setDownloadIdentifier:nil];