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AsyncDisplayKit/AsyncDisplayKit/ASImageNode.h at master · yangbogithub/AsyncDisplayKit · GitHub
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/*
Copyright (c) 2014-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
#
import
<
AsyncDisplayKit/ASControlNode.h
>
/*
*
* Image tints.
*/
typedef
NS_ENUM
(
NSUInteger
, ASImageNodeTint) {
/*
*
* No tint.
*/
ASImageNodeTintNormal =
0
,
/*
*
* Display the image in greyscale.
*/
ASImageNodeTintGreyscale,
};
/*
*
* Image modification block. Use to transform an image before display.
*
* @param image The image to be displayed.
*
* @returns A transformed image.
*/
typedef
UIImage *(^
asimagenode_modification_block_t
)(UIImage *image);
/*
*
* @abstract Draws images.
* @discussion Supports cropping, tinting, and arbitrary image modification blocks.
*/
@interface
ASImageNode
:
ASControlNode
/*
*
* @abstract The image to display.
*
* @discussion The node will efficiently display stretchable images by using
* the layer's contentsCenter property. Non-stretchable images work too, of
* course.
*/
@property
(
atomic
,
retain
) UIImage *image;
/*
*
* @abstract Simple way to tint the image.
*/
@property
(
nonatomic
,
assign
) ASImageNodeTint tint;
/*
*
@abstract The placeholder color.
*/
@property
(
nonatomic
,
strong
) UIColor *placeholderColor;
/*
*
* @abstract Indicates whether efficient cropping of the receiver is enabled.
*
* @discussion Defaults to YES. See -setCropEnabled:recropImmediately:inBounds: for more
* information.
*/
@property
(
nonatomic
,
assign
,
getter
=isCropEnabled)
BOOL
cropEnabled;
/*
*
* @abstract Enables or disables efficient cropping.
*
* @param cropEnabled YES to efficiently crop the receiver's contents such that
* contents outside of its bounds are not included; NO otherwise.
*
* @param recropImmediately If the receiver has an image, YES to redisplay the
* receiver immediately; NO otherwise.
*
* @param cropBounds The bounds into which the receiver will be cropped. Useful
* if bounds are to change in response to cropping (but have not yet done so).
*
* @discussion Efficient cropping is only performed when the receiver's view's
* contentMode is UIViewContentModeScaleAspectFill. By default, cropping is
* enabled. The crop alignment may be controlled via cropAlignmentFactor.
*/
- (
void
)
setCropEnabled
:
(
BOOL
)
cropEnabled
recropImmediately
:
(
BOOL
)
recropImmediately
inBounds
:
(CGRect)
cropBounds
;
/*
*
* @abstract A value that controls how the receiver's efficient cropping is aligned.
*
* @discussion This value defines a rectangle that is to be featured by the
* receiver. The rectangle is specified as a "unit rectangle," using
* percentages of the source image's width and height, e.g. CGRectMake(0.5, 0,
* 0.5, 1.0) will feature the full right half a photo. If the cropRect is
* empty, the content mode of the receiver will be used to determine its
* dimensions, and only the cropRect's origin will be used for positioning. The
* default value of this property is CGRectMake(0.5, 0.5, 0.0, 0.0).
*/
@property
(
nonatomic
,
readwrite
,
assign
) CGRect cropRect;
/*
*
* @abstract An optional block which can perform drawing operations on 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;
/*
*
* @abstract Marks the receiver as needing display and performs a block after
* display has finished.
*
* @param displayCompletionBlock The block to be performed after display has
* finished. Its `canceled` property will be YES if display was prevented or
* canceled (via displaySuspended); NO otherwise.
*
* @discussion displayCompletionBlock will be performed on the main-thread. If
* `displaySuspended` is YES, `displayCompletionBlock` is will be
* performed immediately and `YES` will be passed for `canceled`.
*/
- (
void
)
setNeedsDisplayWithCompletion
:
(
void
(^)(
BOOL
canceled))
displayCompletionBlock
;
@end
ASDISPLAYNODE_EXTERN_C_BEGIN
/*
*
* @abstract Image modification block that rounds (and optionally adds a border to) an image.
*
* @param borderWidth The width of the round border to draw, or zero if no border is desired.
* @param borderColor What colour border to draw.
*
* @see <imageModificationBlock>
*
* @returns An ASImageNode image modification block.
*/
asimagenode_modification_block_t
ASImageNodeRoundBorderModificationBlock
(CGFloat borderWidth, UIColor *borderColor);
ASDISPLAYNODE_EXTERN_C_END
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