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Update ASCellNode visibility API

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This commit is contained in:
Huy Nguyen 2016-02-29 16:21:19 -08:00
parent 07ad27c7f6
commit c64f23725f
4 changed files with 42 additions and 11 deletions
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11
AsyncDisplayKit/ASCellNode.h
View File

@ -14,6 +14,15 @@ NS_ASSUME_NONNULL_BEGIN
typedef NSUInteger ASCellNodeAnimation;
typedef enum : NSUInteger {
// Indicates a cell has just became visible
ASCellNodeVisibilityEventVisible,
// Indicates a visible cell has a different visible rect. Its position, percent visible or both have changed.
ASCellNodeVisibilityEventVisibleRectChanged,
// Indicates a cell is no longer visible
ASCellNodeVisibilityEventInvisible,
} ASCellNodeVisibilityEvent;
/**
* Generic cell node. Subclass this instead of `ASDisplayNode` to use with `ASTableView` and `ASCollectionView`.
*/
@ -90,7 +99,7 @@ typedef NSUInteger ASCellNodeAnimation;
*/
- (instancetype)initWithViewControllerBlock:(ASDisplayNodeViewControllerBlock)viewControllerBlock didLoadBlock:(nullable ASDisplayNodeDidLoadBlock)didLoadBlock;
- (void)visibleNodeDidScroll:(UIScrollView *)scrollView withCellFrame:(CGRect)cellFrame;
- (void)cellNodeVisibilityEvent:(ASCellNodeVisibilityEvent)event inScrollView:(UIScrollView *)scrollView withCellFrame:(CGRect)cellFrame;
@end

4
AsyncDisplayKit/ASCellNode.m
View File

@ -179,7 +179,9 @@
[(_ASDisplayView *)self.view __forwardTouchesCancelled:touches withEvent:event];
}
- (void)visibleNodeDidScroll:(UIScrollView *)scrollView withCellFrame:(CGRect)cellFrame
- (void)cellNodeVisibilityEvent:(ASCellNodeVisibilityEvent)event
inScrollView:(UIScrollView *)scrollView
withCellFrame:(CGRect)cellFrame
{
// To be overriden by subclasses
}

20
AsyncDisplayKit/ASCollectionView.mm
View File

@ -542,8 +542,11 @@ static NSString * const kCellReuseIdentifier = @"_ASCollectionViewCell";
if (cellNode.neverShowPlaceholders) {
[cellNode recursivelyEnsureDisplaySynchronously:YES];
}
if (ASSubclassOverridesSelector([ASCellNode class], [cellNode class], @selector(visibleNodeDidScroll:withCellFrame:))) {
if (ASSubclassOverridesSelector([ASCellNode class], [cellNode class], @selector(cellNodeVisibilityEvent:inScrollView:withCellFrame:))) {
[_cellsForVisibilityUpdates addObject:cell];
[cellNode cellNodeVisibilityEvent:ASCellNodeVisibilityEventVisible
inScrollView:collectionView
withCellFrame:cell.frame];
}
}
@ -556,8 +559,14 @@ static NSString * const kCellReuseIdentifier = @"_ASCollectionViewCell";
ASDisplayNodeAssertNotNil(node, @"Expected node associated with removed cell not to be nil.");
[_asyncDelegate collectionView:self didEndDisplayingNode:node forItemAtIndexPath:indexPath];
}
[_cellsForVisibilityUpdates removeObject:cell];
if ([_cellsForVisibilityUpdates containsObject:cell]) {
ASCellNode *node = ((_ASCollectionViewCell *)cell).node;
[node cellNodeVisibilityEvent:ASCellNodeVisibilityEventInvisible
inScrollView:collectionView
withCellFrame:cell.frame];
[_cellsForVisibilityUpdates removeObject:cell];
}
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
@ -681,9 +690,10 @@ static NSString * const kCellReuseIdentifier = @"_ASCollectionViewCell";
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
for (_ASCollectionViewCell *collectionCell in _cellsForVisibilityUpdates) {
ASCellNode *node = [collectionCell node];
// Only nodes that respond to the selector are added to _cellsForVisibilityUpdates
[node visibleNodeDidScroll:scrollView withCellFrame:collectionCell.frame];
[[collectionCell node] cellNodeVisibilityEvent:ASCellNodeVisibilityEventVisibleRectChanged
inScrollView:scrollView
withCellFrame:collectionCell.frame];
}
if (_asyncDelegateImplementsScrollviewDidScroll) {
[_asyncDelegate scrollViewDidScroll:scrollView];

18
AsyncDisplayKit/ASTableView.mm
View File

@ -597,8 +597,9 @@ static NSString * const kCellReuseIdentifier = @"_ASTableViewCell";
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
for (_ASTableViewCell *tableCell in _cellsForVisibilityUpdates) {
ASCellNode *node = [tableCell node];
[node visibleNodeDidScroll:scrollView withCellFrame:tableCell.frame];
[[tableCell node] cellNodeVisibilityEvent:ASCellNodeVisibilityEventVisibleRectChanged
inScrollView:scrollView
withCellFrame:tableCell.frame];
}
if (_asyncDelegateImplementsScrollviewDidScroll) {
[_asyncDelegate scrollViewDidScroll:scrollView];
@ -617,8 +618,11 @@ static NSString * const kCellReuseIdentifier = @"_ASTableViewCell";
ASCellNode *cellNode = [cell node];
if (ASSubclassOverridesSelector([ASCellNode class], [cellNode class], @selector(visibleNodeDidScroll:withCellFrame:))) {
if (ASSubclassOverridesSelector([ASCellNode class], [cellNode class], @selector(cellNodeVisibilityEvent:inScrollView:withCellFrame:))) {
[_cellsForVisibilityUpdates addObject:cell];
[cellNode cellNodeVisibilityEvent:ASCellNodeVisibilityEventVisible
inScrollView:tableView
withCellFrame:cell.frame];
}
if (cellNode.neverShowPlaceholders) {
[cellNode recursivelyEnsureDisplaySynchronously:YES];
@ -639,7 +643,13 @@ static NSString * const kCellReuseIdentifier = @"_ASTableViewCell";
[_asyncDelegate tableView:self didEndDisplayingNode:node forRowAtIndexPath:indexPath];
}
[_cellsForVisibilityUpdates removeObject:cell];
if ([_cellsForVisibilityUpdates containsObject:cell]) {
[_cellsForVisibilityUpdates removeObject:cell];
ASCellNode *node = ((_ASTableViewCell *)cell).node;
[node cellNodeVisibilityEvent:ASCellNodeVisibilityEventInvisible
inScrollView:tableView
withCellFrame:cell.frame];
}
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"