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Enable collection node interactive moves (#735)

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* Add support for interactive moves

* Enable drag & drop in collection view example

* Update changelog

* Change the gating logic to match UIKit

* Add a warning when we prevent interactive movement due to async layout
This commit is contained in:
Adlai Holler
2018-01-09 14:34:32 -08:00
committed by GitHub
parent 131619de96
commit 5e73396cde
7 changed files with 195 additions and 61 deletions
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123
examples/ASCollectionView/Sample/ViewController.m
View File

@@ -23,10 +23,13 @@
#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) NSArray *data;
@property (nonatomic, strong) NSMutableArray<NSMutableArray<NSString *> *> *data;
@property (nonatomic, strong) UILongPressGestureRecognizer *moveRecognizer;
@end
@@ -34,18 +37,13 @@
#pragma mark - Lifecycle
- (void)dealloc
{
self.collectionNode.dataSource = nil;
self.collectionNode.delegate = nil;
NSLog(@"ViewController is deallocing");
}
- (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;
@@ -54,6 +52,7 @@
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];
@@ -73,34 +72,37 @@
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh
target:self
action:@selector(reloadTapped)];
#endif
#if SIMULATE_WEB_RESPONSE
[self loadData];
#else
__weak typeof(self) weakSelf = self;
void(^mockWebService)() = ^{
NSLog(@"ViewController \"got data from a web service\"");
ViewController *strongSelf = weakSelf;
if (strongSelf != nil)
{
NSLog(@"ViewController is not nil");
strongSelf->_data = [[NSArray alloc] init];
[strongSelf->_collectionNode performBatchUpdates:^{
[strongSelf->_collectionNode insertSections:[[NSIndexSet alloc] initWithIndexesInRange:NSMakeRange(0, 100)]];
} completion:nil];
NSLog(@"ViewController finished updating collectionNode");
}
else {
NSLog(@"ViewController is nil - won't update collectionNode");
}
};
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), mockWebService);
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(4 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[self.navigationController popViewControllerAnimated:YES];
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
@@ -115,14 +117,42 @@
- (CGSize)galleryLayoutDelegate:(ASCollectionGalleryLayoutDelegate *)delegate sizeForElements:(ASElementMap *)elements
{
ASDisplayNodeAssertMainThread();
return CGSizeMake(180, 90);
return kItemSize;
}
#pragma mark - ASCollectionView Data Source
- (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 = [NSString stringWithFormat:@"[%zd.%zd] says hi", indexPath.section, indexPath.item];
NSString *text = self.data[indexPath.section][indexPath.item];
return ^{
return [[ItemNode alloc] initWithString:text];
};
@@ -139,18 +169,29 @@
- (NSInteger)collectionNode:(ASCollectionNode *)collectionNode numberOfItemsInSection:(NSInteger)section
{
return 10;
return self.data[section].count;
}
- (NSInteger)numberOfSectionsInCollectionNode:(ASCollectionNode *)collectionNode
{
#if SIMULATE_WEB_RESPONSE
return _data == nil ? 0 : 100;
#else
return 100;
#endif
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");