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Add image-modification support to ASImageNode.

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This commit is contained in:
Nadine Salter 2014-09-08 17:09:14 -07:00
parent 4da9912e2c
commit 0053e00a52
2 changed files with 20 additions and 2 deletions
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8
AsyncDisplayKit/ASImageNode.h
View File

@ -12,6 +12,9 @@ typedef NS_ENUM(NSUInteger, ASImageNodeTint) {
ASImageNodeTintNormal = 0, ASImageNodeTintNormal = 0,
ASImageNodeTintGreyscale, ASImageNodeTintGreyscale,
}; };
typedef UIImage *(^asimagenode_modification_block_t)(UIImage *);
// FIXME: This class should not derive from ASControlNode once ASButtonNode is implemented. // FIXME: This class should not derive from ASControlNode once ASButtonNode is implemented.
@interface ASImageNode : ASControlNode @interface ASImageNode : ASControlNode
@ -40,6 +43,11 @@ typedef NS_ENUM(NSUInteger, ASImageNodeTint) {
*/ */
@property (nonatomic, readwrite, assign) CGRect cropRect; @property (nonatomic, readwrite, assign) CGRect cropRect;
/**
@abstract An optional block which can perform drawing operations on {@ref image} during the display phase.
@discussion Can be used to add image effects (such as rounding, adding borders, or other pattern overlays) without extraneous display calls.
*/
@property (nonatomic, readwrite, copy) asimagenode_modification_block_t imageModificationBlock;
#pragma mark - #pragma mark -
/** /**

14
AsyncDisplayKit/ASImageNode.mm
View File

@ -26,13 +26,14 @@
@property (nonatomic, retain) UIColor *backgroundColor; @property (nonatomic, retain) UIColor *backgroundColor;
@property (nonatomic, assign) UIViewContentMode contentMode; @property (nonatomic, assign) UIViewContentMode contentMode;
@property (nonatomic, assign) CGRect cropRect; @property (nonatomic, assign) CGRect cropRect;
@property (nonatomic, copy) asimagenode_modification_block_t imageModificationBlock;
@end @end
// TODO: eliminate explicit parameters with a set of keys copied from the node // TODO: eliminate explicit parameters with a set of keys copied from the node
@implementation _ASImageNodeDrawParameters @implementation _ASImageNodeDrawParameters
- (id)initWithCrop:(BOOL)cropEnabled opaque:(BOOL)opaque image:(UIImage *)image bounds:(CGRect)bounds contentsScale:(CGFloat)contentsScale backgroundColor:(UIColor *)backgroundColor tint:(ASImageNodeTint)tint contentMode:(UIViewContentMode)contentMode cropRect:(CGRect)cropRect - (id)initWithCrop:(BOOL)cropEnabled opaque:(BOOL)opaque image:(UIImage *)image bounds:(CGRect)bounds contentsScale:(CGFloat)contentsScale backgroundColor:(UIColor *)backgroundColor tint:(ASImageNodeTint)tint contentMode:(UIViewContentMode)contentMode cropRect:(CGRect)cropRect imageModificationBlock:(asimagenode_modification_block_t)imageModificationBlock
{ {
self = [self init]; self = [self init];
if (!self) return nil; if (!self) return nil;
@ -46,6 +47,7 @@
_tint = tint; _tint = tint;
_contentMode = contentMode; _contentMode = contentMode;
_cropRect = cropRect; _cropRect = cropRect;
_imageModificationBlock = [imageModificationBlock copy];
return self; return self;
} }
@ -54,6 +56,7 @@
{ {
[_image release]; [_image release];
[_backgroundColor release]; [_backgroundColor release];
[_imageModificationBlock release];
[super dealloc]; [super dealloc];
} }
@ -103,6 +106,7 @@
{ {
[_displayCompletionBlock release]; [_displayCompletionBlock release];
[_image release]; [_image release];
[_imageModificationBlock release];
[super dealloc]; [super dealloc];
} }
@ -163,7 +167,9 @@
backgroundColor:self.backgroundColor backgroundColor:self.backgroundColor
tint:self.tint tint:self.tint
contentMode:self.contentMode contentMode:self.contentMode
cropRect:self.cropRect] autorelease]; cropRect:self.cropRect
imageModificationBlock:self.imageModificationBlock
] autorelease];
} }
+ (UIImage *)displayWithParameters:(_ASImageNodeDrawParameters *)parameters isCancelled:(asdisplaynode_iscancelled_block_t)isCancelled + (UIImage *)displayWithParameters:(_ASImageNodeDrawParameters *)parameters isCancelled:(asdisplaynode_iscancelled_block_t)isCancelled
@ -247,6 +253,10 @@
UIGraphicsEndImageContext(); UIGraphicsEndImageContext();
if (parameters.imageModificationBlock != NULL) {
result = parameters.imageModificationBlock(result);
}
if (stretchable) { if (stretchable) {
return [image resizableImageWithCapInsets:image.capInsets resizingMode:image.resizingMode]; return [image resizableImageWithCapInsets:image.capInsets resizingMode:image.resizingMode];
} }