Add 'submodules/AsyncDisplayKit/' from commit '02bedc12816e251ad71777f9d2578329b6d2bef6'

git-subtree-dir: submodules/AsyncDisplayKit
git-subtree-mainline: d06f423e0e
git-subtree-split: 02bedc1281

submodules/AsyncDisplayKit/examples/ASCollectionView/Sample/ViewController.m

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+//
+//  ViewController.m
+//  Texture
+//
+//  Copyright (c) Facebook, Inc. and its affiliates.  All rights reserved.
+//  Changes after 4/13/2017 are: Copyright (c) Pinterest, Inc.  All rights reserved.
+//  Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
+//
+
+#import "ViewController.h"
+#import "AppDelegate.h"
+#import <AsyncDisplayKit/AsyncDisplayKit.h>
+#import "SupplementaryNode.h"
+#import "ItemNode.h"
+
+#define ASYNC_COLLECTION_LAYOUT 0
+
+static CGSize const kItemSize = (CGSize){180, 90};
+
+@interface ViewController () <ASCollectionDataSource, ASCollectionDelegateFlowLayout, ASCollectionGalleryLayoutPropertiesProviding>
+
+@property (nonatomic, strong) ASCollectionNode *collectionNode;
+@property (nonatomic, strong) NSMutableArray<NSMutableArray<NSString *> *> *data;
+@property (nonatomic, strong) UILongPressGestureRecognizer *moveRecognizer;
+
+@end
+
+@implementation ViewController
+
+#pragma mark - Lifecycle
+
+- (void)viewDidLoad
+{
+  [super viewDidLoad];
+
+  self.moveRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress)];
+  [self.view addGestureRecognizer:self.moveRecognizer];
+  
+#if ASYNC_COLLECTION_LAYOUT
+  ASCollectionGalleryLayoutDelegate *layoutDelegate = [[ASCollectionGalleryLayoutDelegate alloc] initWithScrollableDirections:ASScrollDirectionVerticalDirections];
+  layoutDelegate.propertiesProvider = self;
+  self.collectionNode = [[ASCollectionNode alloc] initWithLayoutDelegate:layoutDelegate layoutFacilitator:nil];
+#else
+  UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
+  layout.headerReferenceSize = CGSizeMake(50.0, 50.0);
+  layout.footerReferenceSize = CGSizeMake(50.0, 50.0);
+  layout.itemSize = kItemSize;
+  self.collectionNode = [[ASCollectionNode alloc] initWithFrame:self.view.bounds collectionViewLayout:layout];
+  [self.collectionNode registerSupplementaryNodeOfKind:UICollectionElementKindSectionHeader];
+  [self.collectionNode registerSupplementaryNodeOfKind:UICollectionElementKindSectionFooter];
+#endif
+  
+  self.collectionNode.dataSource = self;
+  self.collectionNode.delegate = self;
+  
+  self.collectionNode.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
+  self.collectionNode.backgroundColor = [UIColor whiteColor];
+  
+  [self.view addSubnode:self.collectionNode];
+  self.collectionNode.frame = self.view.bounds;
+  
+#if !SIMULATE_WEB_RESPONSE
+  self.navigationItem.leftItemsSupplementBackButton = YES;
+  self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh
+                                                                                        target:self
+                                                                                        action:@selector(reloadTapped)];
+  [self loadData];
+#else
+  __weak typeof(self) weakSelf = self;
+  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+    [weakSelf handleSimulatedWebResponse];
+  });
+#endif
+}
+
+- (void)handleSimulatedWebResponse
+{
+  [self.collectionNode performBatchUpdates:^{
+    [self loadData];
+    [self.collectionNode insertSections:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, self.data.count)]];
+  } completion:nil];
+}
+
+- (void)loadData
+{
+  // Form our data array
+  typeof(self.data) data = [NSMutableArray array];
+  for (NSInteger s = 0; s < 100; s++) {
+    NSMutableArray *items = [NSMutableArray array];
+    for (NSInteger i = 0; i < 10; i++) {
+      items[i] = [NSString stringWithFormat:@"[%zd.%zd] says hi", s, i];
+    }
+    data[s] = items;
+  }
+  self.data = data;
+}
+
+#pragma mark - Button Actions
+
+- (void)reloadTapped
+{
+  // This method is deprecated because we reccommend using ASCollectionNode instead of ASCollectionView.
+  // This functionality & example project remains for users who insist on using ASCollectionView.
+  [self.collectionNode reloadData];
+}
+
+#pragma mark - ASCollectionGalleryLayoutPropertiesProviding
+
+- (CGSize)galleryLayoutDelegate:(ASCollectionGalleryLayoutDelegate *)delegate sizeForElements:(ASElementMap *)elements
+{
+  ASDisplayNodeAssertMainThread();
+  return kItemSize;
+}
+
+- (void)handleLongPress
+{
+  UICollectionView *collectionView = self.collectionNode.view;
+  CGPoint location = [self.moveRecognizer locationInView:collectionView];
+  switch (self.moveRecognizer.state) {
+    case UIGestureRecognizerStateBegan: {
+      NSIndexPath *indexPath = [collectionView indexPathForItemAtPoint:location];
+      if (indexPath) {
+        [collectionView beginInteractiveMovementForItemAtIndexPath:indexPath];
+      }
+      break;
+    }
+    case UIGestureRecognizerStateChanged:
+      [collectionView updateInteractiveMovementTargetPosition:location];
+      break;
+    case UIGestureRecognizerStateEnded:
+      [collectionView endInteractiveMovement];
+      break;
+    case UIGestureRecognizerStateFailed:
+    case UIGestureRecognizerStateCancelled:
+      [collectionView cancelInteractiveMovement];
+      break;
+    case UIGestureRecognizerStatePossible:
+      // nop
+      break;
+  }
+}
+
+#pragma mark - ASCollectionDataSource
+
+- (ASCellNodeBlock)collectionNode:(ASCollectionNode *)collectionNode nodeBlockForItemAtIndexPath:(NSIndexPath *)indexPath;
+{
+  NSString *text = self.data[indexPath.section][indexPath.item];
+  return ^{
+    return [[ItemNode alloc] initWithString:text];
+  };
+}
+
+- (ASCellNode *)collectionNode:(ASCollectionNode *)collectionNode nodeForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath
+{
+  NSString *text = [kind isEqualToString:UICollectionElementKindSectionHeader] ? @"Header" : @"Footer";
+  SupplementaryNode *node = [[SupplementaryNode alloc] initWithText:text];
+  BOOL isHeaderSection = [kind isEqualToString:UICollectionElementKindSectionHeader];
+  node.backgroundColor = isHeaderSection ? [UIColor blueColor] : [UIColor redColor];
+  return node;
+}
+
+- (NSInteger)collectionNode:(ASCollectionNode *)collectionNode numberOfItemsInSection:(NSInteger)section
+{
+  return self.data[section].count;
+}
+
+- (NSInteger)numberOfSectionsInCollectionNode:(ASCollectionNode *)collectionNode
+{
+  return self.data.count;
+}
+
+- (BOOL)collectionNode:(ASCollectionNode *)collectionNode canMoveItemWithNode:(ASCellNode *)node
+{
+  return YES;
+}
+
+- (void)collectionNode:(ASCollectionNode *)collectionNode moveItemAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath
+{
+  __auto_type sectionArray = self.data[sourceIndexPath.section];
+  __auto_type object = sectionArray[sourceIndexPath.item];
+  [sectionArray removeObjectAtIndex:sourceIndexPath.item];
+  [self.data[destinationIndexPath.section] insertObject:object atIndex:destinationIndexPath.item];
+}
+
+#pragma mark - ASCollectionDelegate
+
+- (void)collectionNode:(ASCollectionNode *)collectionNode willBeginBatchFetchWithContext:(ASBatchContext *)context
+{
+  NSLog(@"fetch additional content");
+  [context completeBatchFetching:YES];
+}
+
+@end