Initial commit for AsyncDisplayKitOverview

examples/AsyncDisplayKitOverview/Sample/Node Containers/OverviewASPagerNode.m

@@ -0,0 +1,77 @@
+//
+//  OverviewASPagerNode.m
+//  AsyncDisplayKitOverview
+//
+//  Created by Michael Schneider on 4/17/16.
+//  Copyright © 2016 Facebook. All rights reserved.
+//
+
+#import "OverviewASPagerNode.h"
+
+#pragma mark - Helper
+
+static UIColor *OverViewASPagerNodeRandomColor() {
+    CGFloat hue = ( arc4random() % 256 / 256.0 );  //  0.0 to 1.0
+    CGFloat saturation = ( arc4random() % 128 / 256.0 ) + 0.5;  //  0.5 to 1.0, away from white
+    CGFloat brightness = ( arc4random() % 128 / 256.0 ) + 0.5;  //  0.5 to 1.0, away from black
+    return [UIColor colorWithHue:hue saturation:saturation brightness:brightness alpha:1];
+}
+
+
+#pragma mark - OverviewASPageNode
+
+@interface OverviewASPageNode : ASCellNode @end
+
+@implementation OverviewASPageNode
+
+- (ASLayout *)calculateLayoutThatFits:(ASSizeRange)constrainedSize
+{
+    return [ASLayout layoutWithLayoutableObject:self size:constrainedSize.max];
+}
+
+@end
+
+
+#pragma mark - OverviewASPagerNode
+
+@interface OverviewASPagerNode () <ASPagerNodeDataSource>
+@property (nonatomic, strong) ASPagerNode *node;
+@property (nonatomic, copy) NSArray *data;
+@end
+
+@implementation OverviewASPagerNode
+
+- (instancetype)init
+{
+    self = [super init];
+    if (self == nil) { return self; }
+    
+    _node = [ASPagerNode new];
+    _node.dataSource = self;
+    [self addSubnode:_node];
+    
+    return self;
+}
+
+- (ASLayoutSpec *)layoutSpecThatFits:(ASSizeRange)constrainedSize
+{
+    _node.sizeRange = ASRelativeSizeRangeMakeWithExactCGSize(constrainedSize.max);
+    return [ASStaticLayoutSpec staticLayoutSpecWithChildren:@[_node]];
+}
+
+- (NSInteger)numberOfPagesInPagerNode:(ASPagerNode *)pagerNode
+{
+    return 4;
+}
+
+- (ASCellNodeBlock)pagerNode:(ASPagerNode *)pagerNode nodeBlockAtIndex:(NSInteger)index
+{
+    return ^{
+        ASCellNode *cellNode = [OverviewASPageNode new];
+        cellNode.backgroundColor = OverViewASPagerNodeRandomColor();
+        return cellNode;
+    };
+}
+
+
+@end