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85 lines
2.7 KiB
Objective-C
85 lines
2.7 KiB
Objective-C
//
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// SlowpokeImageNode.m
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// Sample
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//
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// Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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#import "SlowpokeImageNode.h"
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#import <AsyncDisplayKit/ASDisplayNode+Subclasses.h>
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static CGFloat const kASDKLogoAspectRatio = 2.79;
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@interface ASImageNode (ForwardWorkaround)
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// This is a workaround until subclass overriding of custom drawing class methods is fixed
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- (UIImage *)displayWithParameters:(id<NSObject>)parameters isCancelled:(asdisplaynode_iscancelled_block_t)isCancelledBlock;
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@end
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@implementation SlowpokeImageNode
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- (UIImage *)displayWithParameters:(id<NSObject>)parameters isCancelled:(asdisplaynode_iscancelled_block_t)isCancelledBlock
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{
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usleep( (long)(0.5 * USEC_PER_SEC) ); // artificial delay of 0.5s
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return [super displayWithParameters:parameters isCancelled:isCancelledBlock];
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}
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- (instancetype)init
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{
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if (self = [super init]) {
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self.placeholderEnabled = YES;
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self.placeholderFadeDuration = 0.1;
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}
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return self;
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}
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- (CGSize)calculateSizeThatFits:(CGSize)constrainedSize
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{
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if (constrainedSize.width > 0.0) {
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return CGSizeMake(constrainedSize.width, constrainedSize.width / kASDKLogoAspectRatio);
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} else if (constrainedSize.height > 0.0) {
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return CGSizeMake(constrainedSize.height * kASDKLogoAspectRatio, constrainedSize.height);
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}
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return CGSizeZero;
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}
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- (UIImage *)placeholderImage
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{
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CGSize size = self.calculatedSize;
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if (CGSizeEqualToSize(size, CGSizeZero)) {
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return nil;
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}
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UIGraphicsBeginImageContext(size);
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[[UIColor whiteColor] setFill];
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[[UIColor colorWithWhite:0.9 alpha:1] setStroke];
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UIRectFill((CGRect){CGPointZero, size});
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UIBezierPath *path = [UIBezierPath bezierPath];
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[path moveToPoint:CGPointZero];
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[path addLineToPoint:(CGPoint){size.width, size.height}];
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[path stroke];
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[path moveToPoint:(CGPoint){size.width, 0.0}];
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[path addLineToPoint:(CGPoint){0.0, size.height}];
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[path stroke];
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UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
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UIGraphicsEndImageContext();
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return image;
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}
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@end
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