/* This file provided by Facebook is for non-commercial testing and evaluation

* purposes only. Facebook reserves all rights not expressly granted.

*

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

* FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN

* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

*/

#import "BlurbNode.h"

#import <AsyncDisplayKit/ASDisplayNode+Subclasses.h>

#import <AsyncDisplayKit/ASHighlightOverlayLayer.h>

static CGFloat kTextPadding = 10.0f;

static NSString *kLinkAttributeName = @"PlaceKittenNodeLinkAttributeName";

@interface BlurbNode () <ASTextNodeDelegate>

{

ASTextNode *_textNode;

}

@end

@implementation BlurbNode

- (instancetype)init

{

if (!(self = [super init]))

return nil;

// create a text node

_textNode = [[ASTextNode alloc] init];

// configure the node to support tappable links

_textNode.delegate = self;

_textNode.userInteractionEnabled = YES;

_textNode.linkAttributeNames = @[ kLinkAttributeName ];

// generate an attributed string using the custom link attribute specified above

NSString *blurb = @"kittens courtesy placekitten.com \U0001F638";

NSMutableAttributedString *string = [[NSMutableAttributedString alloc] initWithString:blurb];

[string addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"HelveticaNeue-Light" size:16.0f] range:NSMakeRange(0, blurb.length)];

[string addAttributes:@{

kLinkAttributeName: [NSURL URLWithString:@"http://placekitten.com/"],

NSForegroundColorAttributeName: [UIColor grayColor],

NSUnderlineStyleAttributeName: @(NSUnderlineStyleSingle | NSUnderlinePatternDot),

}

range:[blurb rangeOfString:@"placekitten.com"]];

_textNode.attributedString = string;

// add it as a subnode, and we're done

[self addSubnode:_textNode];

return self;

}

- (void)didLoad

{

// enable highlighting now that self.layer has loaded -- see ASHighlightOverlayLayer.h

self.layer.as_allowsHighlightDrawing = YES;

[super didLoad];

}

- (CGSize)calculateSizeThatFits:(CGSize)constrainedSize

{

// called on a background thread. custom nodes must call -measure: on their subnodes in -calculateSizeThatFits:

CGSize measuredSize = [_textNode measure:CGSizeMake(constrainedSize.width - 2 * kTextPadding,

constrainedSize.height - 2 * kTextPadding)];

return CGSizeMake(constrainedSize.width, measuredSize.height + 2 * kTextPadding);

}

- (void)layout

{

// called on the main thread. we'll use the stashed size from above, instead of blocking on text sizing

CGSize textNodeSize = _textNode.calculatedSize;

_textNode.frame = CGRectMake(roundf((self.calculatedSize.width - textNodeSize.width) / 2.0f),

kTextPadding,

textNodeSize.width,

textNodeSize.height);

}

- (BOOL)textNode:(ASTextNode *)richTextNode shouldHighlightLinkAttribute:(NSString *)attribute value:(id)value atPoint:(CGPoint)point

{

// opt into link highlighting -- tap and hold the link to try it! must enable highlighting on a layer, see -didLoad

return YES;

}

- (void)textNode:(ASTextNode *)richTextNode tappedLinkAttribute:(NSString *)attribute value:(NSURL *)URL atPoint:(CGPoint)point textRange:(NSRange)textRange

{

// the node tapped a link, open it

[[UIApplication sharedApplication] openURL:URL];

}

@end