ThePain/Swiftgram
1
0
Fork 0
mirror of https://github.com/Swiftgram/Telegram-iOS.git synced 2025-12-23 06:35:51 +00:00
Code Issues Packages Projects Releases Wiki Activity

Move most of the batch fetching logic to a central place for ASTableView and ASCollectionView usage

Browse Source
This commit is contained in:
Michael Schneider
2016-04-08 19:42:14 -07:00
parent 40fe1f3ac7
commit 24ca09ee6c
4 changed files with 219 additions and 199 deletions
Download Patch File Download Diff File Expand all files Collapse all files

142
AsyncDisplayKit/ASCollectionView.mm
View File

@@ -91,7 +91,7 @@ static NSString * const kCellReuseIdentifier = @"_ASCollectionViewCell";
#pragma mark -
#pragma mark ASCollectionView.
@interface ASCollectionView () <ASRangeControllerDataSource, ASRangeControllerDelegate, ASDataControllerSource, ASCellNodeLayoutDelegate, ASDelegateProxyInterceptor> {
@interface ASCollectionView () <ASRangeControllerDataSource, ASRangeControllerDelegate, ASDataControllerSource, ASCellNodeLayoutDelegate, ASDelegateProxyInterceptor, ASBatchFetchingScrollView> {
ASCollectionViewProxy *_proxyDataSource;
ASCollectionViewProxy *_proxyDelegate;
@@ -605,8 +605,45 @@ static NSString * const kCellReuseIdentifier = @"_ASCollectionViewCell";
cellNode.scrollView = nil;
}
#pragma mark -
#pragma mark Scroll Direction.
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
// If a scroll happenes the current range mode needs to go to full
ASInterfaceState interfaceState = [self interfaceStateForRangeController:_rangeController];
if (ASInterfaceStateIncludesVisible(interfaceState)) {
[_rangeController updateCurrentRangeWithMode:ASLayoutRangeModeFull];
}
for (_ASCollectionViewCell *collectionCell in _cellsForVisibilityUpdates) {
// Only nodes that respond to the selector are added to _cellsForVisibilityUpdates
[[collectionCell node] cellNodeVisibilityEvent:ASCellNodeVisibilityEventVisibleRectChanged
inScrollView:scrollView
withCellFrame:collectionCell.frame];
}
if (_asyncDelegateImplementsScrollviewDidScroll) {
[_asyncDelegate scrollViewDidScroll:scrollView];
}
}
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset
{
_deceleratingVelocity = CGPointMake(
scrollView.contentOffset.x - ((targetContentOffset != NULL) ? targetContentOffset->x : 0),
scrollView.contentOffset.y - ((targetContentOffset != NULL) ? targetContentOffset->y : 0)
);
if (targetContentOffset != NULL) {
ASDisplayNodeAssert(_batchContext != nil, @"Batch context should exist");
[self _beginBatchFetchingIfNeededWithScrollView:self forScrollDirection:[self scrollDirection] contentOffset:*targetContentOffset];
}
if ([_asyncDelegate respondsToSelector:@selector(scrollViewWillEndDragging:withVelocity:targetContentOffset:)]) {
[_asyncDelegate scrollViewWillEndDragging:scrollView withVelocity:velocity targetContentOffset:targetContentOffset];
}
}
#pragma mark - Scroll Direction.
- (ASScrollDirection)scrollDirection
{
@@ -700,58 +737,14 @@ static NSString * const kCellReuseIdentifier = @"_ASCollectionViewCell";
}
#pragma mark -
#pragma mark Batch Fetching
#pragma mark - Batch Fetching
- (void)_checkForBatchFetching
- (ASBatchContext *)batchContext
{
// Dragging will be handled in scrollViewWillEndDragging:withVelocity:targetContentOffset:
if ([self isDragging] || [self isTracking] || ![self _shouldBatchFetch]) {
return;
}
// Check if we should batch fetch
if (ASDisplayShouldFetchBatchForContext(_batchContext, [self scrollableDirections], self.bounds, self.contentSize, self.contentOffset, _leadingScreensForBatching)) {
[self _beginBatchFetching];
}
return _batchContext;
}
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset
{
_deceleratingVelocity = CGPointMake(
scrollView.contentOffset.x - ((targetContentOffset != NULL) ? targetContentOffset->x : 0),
scrollView.contentOffset.y - ((targetContentOffset != NULL) ? targetContentOffset->y : 0)
);
if (targetContentOffset != NULL) {
[self _handleBatchFetchScrollingToOffset:*targetContentOffset];
}
if ([_asyncDelegate respondsToSelector:@selector(scrollViewWillEndDragging:withVelocity:targetContentOffset:)]) {
[_asyncDelegate scrollViewWillEndDragging:scrollView withVelocity:velocity targetContentOffset:targetContentOffset];
}
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
// If a scroll happenes the current range mode needs to go to full
ASInterfaceState interfaceState = [self interfaceStateForRangeController:_rangeController];
if (ASInterfaceStateIncludesVisible(interfaceState)) {
[_rangeController updateCurrentRangeWithMode:ASLayoutRangeModeFull];
}
for (_ASCollectionViewCell *collectionCell in _cellsForVisibilityUpdates) {
// Only nodes that respond to the selector are added to _cellsForVisibilityUpdates
[[collectionCell node] cellNodeVisibilityEvent:ASCellNodeVisibilityEventVisibleRectChanged
inScrollView:scrollView
withCellFrame:collectionCell.frame];
}
if (_asyncDelegateImplementsScrollviewDidScroll) {
[_asyncDelegate scrollViewDidScroll:scrollView];
}
}
- (BOOL)_shouldBatchFetch
- (BOOL)canBatchFetch
{
// if the delegate does not respond to this method, there is no point in starting to fetch
BOOL canFetch = [_asyncDelegate respondsToSelector:@selector(collectionView:willBeginBatchFetchWithContext:)];
@@ -762,25 +755,41 @@ static NSString * const kCellReuseIdentifier = @"_ASCollectionViewCell";
}
}
- (void)_handleBatchFetchScrollingToOffset:(CGPoint)targetOffset
- (void)_scheduleCheckForBatchFetching
{
ASDisplayNodeAssert(_batchContext != nil, @"Batch context should exist");
if (![self _shouldBatchFetch]) {
// Push this to the next runloop to be sure the UITableView has the right content size
dispatch_async(dispatch_get_main_queue(), ^{
[self _checkForBatchFetching];
});
}
- (void)_checkForBatchFetching
{
// Dragging will be handled in scrollViewWillEndDragging:withVelocity:targetContentOffset:
if (self.isDragging || self.isTracking) {
return;
}
if (ASDisplayShouldFetchBatchForContext(_batchContext, [self scrollDirection], self.bounds, self.contentSize, targetOffset, _leadingScreensForBatching)) {
[self _beginBatchFetchingIfNeededWithScrollView:self forScrollDirection:[self scrollableDirections] contentOffset:self.contentOffset];
}
- (void)_beginBatchFetchingIfNeededWithScrollView:(UIScrollView<ASBatchFetchingScrollView> *)scrollView forScrollDirection:(ASScrollDirection)scrollDirection contentOffset:(CGPoint)contentOffset
{
if (ASDisplayShouldFetchBatchForScrollView(self, scrollDirection, contentOffset)) {
[self _beginBatchFetching];
}
}
- (void)_beginBatchFetching
{
NSLog(@"begin batch fetching");
[_batchContext beginBatchFetching];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
[_asyncDelegate collectionView:self willBeginBatchFetchWithContext:_batchContext];
});
if ([_asyncDelegate respondsToSelector:@selector(collectionView:willBeginBatchFetchWithContext:)]) {
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
[_asyncDelegate collectionView:self willBeginBatchFetchWithContext:_batchContext];
});
}
}
@@ -972,7 +981,10 @@ static NSString * const kCellReuseIdentifier = @"_ASCollectionViewCell";
for (dispatch_block_t block in _batchUpdateBlocks) {
block();
}
} completion:completion];
} completion:^(BOOL finished){
[self _scheduleCheckForBatchFetching];
if (completion) { completion(finished); }
}];
});
[_batchUpdateBlocks removeAllObjects];
@@ -993,11 +1005,10 @@ static NSString * const kCellReuseIdentifier = @"_ASCollectionViewCell";
}];
} else {
[_layoutFacilitator collectionViewWillEditCellsAtIndexPaths:indexPaths batched:NO];
ASPerformBlockWithoutAnimationCompletion(YES, ^{
[UIView performWithoutAnimation:^{
[super insertItemsAtIndexPaths:indexPaths];
}, ^{
});
[self _scheduleCheckForBatchFetching];
}];
}
}
@@ -1017,6 +1028,7 @@ static NSString * const kCellReuseIdentifier = @"_ASCollectionViewCell";
[_layoutFacilitator collectionViewWillEditCellsAtIndexPaths:indexPaths batched:NO];
[UIView performWithoutAnimation:^{
[super deleteItemsAtIndexPaths:indexPaths];
[self _scheduleCheckForBatchFetching];
}];
}
}
@@ -1037,6 +1049,7 @@ static NSString * const kCellReuseIdentifier = @"_ASCollectionViewCell";
[_layoutFacilitator collectionViewWillEditSectionsAtIndexSet:indexSet batched:NO];
[UIView performWithoutAnimation:^{
[super insertSections:indexSet];
[self _scheduleCheckForBatchFetching];
}];
}
}
@@ -1057,6 +1070,7 @@ static NSString * const kCellReuseIdentifier = @"_ASCollectionViewCell";
[_layoutFacilitator collectionViewWillEditSectionsAtIndexSet:indexSet batched:NO];
[UIView performWithoutAnimation:^{
[super deleteSections:indexSet];
[self _scheduleCheckForBatchFetching];
}];
}
}