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[ASRangeController] Initial implementation of functional-style, ASInterfaceState-based range controller.

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This commit is contained in:
Scott Goodson
2016-01-01 00:48:44 -08:00
parent 7a9cd1f930
commit b273f358f5
26 changed files with 382 additions and 187 deletions
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166
AsyncDisplayKit/Details/ASCollectionViewLayoutController.mm
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@@ -15,36 +15,6 @@
#import "CGRect+ASConvenience.h"
#import "UICollectionViewLayout+ASConvenience.h"
struct ASDirectionalScreenfulBuffer {
CGFloat positiveDirection; // Positive relative to iOS Core Animation layer coordinate space.
CGFloat negativeDirection;
};
typedef struct ASDirectionalScreenfulBuffer ASDirectionalScreenfulBuffer;
ASDirectionalScreenfulBuffer ASDirectionalScreenfulBufferHorizontal(ASScrollDirection scrollDirection,
ASRangeTuningParameters rangeTuningParameters)
{
ASDirectionalScreenfulBuffer horizontalBuffer = {0, 0};
BOOL movingRight = ASScrollDirectionContainsRight(scrollDirection);
horizontalBuffer.positiveDirection = movingRight ? rangeTuningParameters.leadingBufferScreenfuls :
rangeTuningParameters.trailingBufferScreenfuls;
horizontalBuffer.negativeDirection = movingRight ? rangeTuningParameters.trailingBufferScreenfuls :
rangeTuningParameters.leadingBufferScreenfuls;
return horizontalBuffer;
}
ASDirectionalScreenfulBuffer ASDirectionalScreenfulBufferVertical(ASScrollDirection scrollDirection,
ASRangeTuningParameters rangeTuningParameters)
{
ASDirectionalScreenfulBuffer verticalBuffer = {0, 0};
BOOL movingDown = ASScrollDirectionContainsDown(scrollDirection);
verticalBuffer.positiveDirection = movingDown ? rangeTuningParameters.leadingBufferScreenfuls :
rangeTuningParameters.trailingBufferScreenfuls;
verticalBuffer.negativeDirection = movingDown ? rangeTuningParameters.trailingBufferScreenfuls :
rangeTuningParameters.leadingBufferScreenfuls;
return verticalBuffer;
}
struct ASRangeGeometry {
CGRect rangeBounds;
CGRect updateBounds;
@@ -57,9 +27,9 @@ typedef struct ASRangeGeometry ASRangeGeometry;
@interface ASCollectionViewLayoutController ()
{
@package
ASCollectionView * __weak _collectionView;
UICollectionViewLayout * __strong _collectionViewLayout;
std::vector<CGRect> _updateRangeBoundsIndexedByRangeType;
ASScrollDirection _scrollableDirections;
}
@end
@@ -75,63 +45,34 @@ typedef struct ASRangeGeometry ASRangeGeometry;
_scrollableDirections = [collectionView scrollableDirections];
_collectionView = collectionView;
_collectionViewLayout = [collectionView collectionViewLayout];
return self;
}
@end
@implementation ASCollectionViewLayoutControllerStable
{
std::vector<CGRect> _updateRangeBoundsIndexedByRangeType;
}
- (instancetype)initWithCollectionView:(ASCollectionView *)collectionView
{
if (!(self = [super initWithCollectionView:collectionView])) {
return nil;
}
_updateRangeBoundsIndexedByRangeType = std::vector<CGRect>(ASLayoutRangeTypeCount);
return self;
}
#pragma mark -
#pragma mark Index Paths in Range
- (NSSet *)indexPathsForScrolling:(ASScrollDirection)scrollDirection
viewportSize:(CGSize)viewportSize
rangeType:(ASLayoutRangeType)rangeType
- (NSSet *)indexPathsForScrolling:(ASScrollDirection)scrollDirection rangeType:(ASLayoutRangeType)rangeType
{
ASRangeGeometry rangeGeometry = [self rangeGeometryWithScrollDirection:scrollDirection
rangeTuningParameters:[self tuningParametersForRangeType:rangeType]];
ASRangeTuningParameters tuningParameters = [self tuningParametersForRangeType:rangeType];
ASRangeGeometry rangeGeometry = [self rangeGeometryWithScrollDirection:scrollDirection tuningParameters:tuningParameters];
_updateRangeBoundsIndexedByRangeType[rangeType] = rangeGeometry.updateBounds;
return [self indexPathsForItemsWithinRangeBounds:rangeGeometry.rangeBounds];
}
- (ASRangeGeometry)rangeGeometryWithScrollDirection:(ASScrollDirection)scrollDirection
rangeTuningParameters:(ASRangeTuningParameters)rangeTuningParameters
{
CGRect rangeBounds = _collectionView.bounds;
CGRect updateBounds = _collectionView.bounds;
//scrollable directions can change for non-flow layouts
if ([_collectionViewLayout asdk_isFlowLayout] == NO) {
_scrollableDirections = [_collectionView scrollableDirections];
}
BOOL canScrollHorizontally = ASScrollDirectionContainsHorizontalDirection(_scrollableDirections);
if (canScrollHorizontally) {
ASDirectionalScreenfulBuffer horizontalBuffer = ASDirectionalScreenfulBufferHorizontal(scrollDirection,
rangeTuningParameters);
rangeBounds = asdk_CGRectExpandHorizontally(rangeBounds,
horizontalBuffer.negativeDirection,
horizontalBuffer.positiveDirection);
// Update bounds is at most 95% of the next/previous screenful and at least half of tuning parameter value.
updateBounds = asdk_CGRectExpandHorizontally(updateBounds,
MIN(horizontalBuffer.negativeDirection * 0.5, 0.95),
MIN(horizontalBuffer.positiveDirection * 0.5, 0.95));
}
BOOL canScrollVertically = ASScrollDirectionContainsVerticalDirection(_scrollableDirections);
if (canScrollVertically) {
ASDirectionalScreenfulBuffer verticalBuffer = ASDirectionalScreenfulBufferVertical(scrollDirection,
rangeTuningParameters);
rangeBounds = asdk_CGRectExpandVertically(rangeBounds,
verticalBuffer.negativeDirection,
verticalBuffer.positiveDirection);
// Update bounds is at most 95% of the next/previous screenful and at least half of tuning parameter value.
updateBounds = asdk_CGRectExpandVertically(updateBounds,
MIN(verticalBuffer.negativeDirection * 0.5, 0.95),
MIN(verticalBuffer.positiveDirection * 0.5, 0.95));
}
return {rangeBounds, updateBounds};
}
- (NSSet *)indexPathsForItemsWithinRangeBounds:(CGRect)rangeBounds
{
NSMutableSet *indexPathSet = [[NSMutableSet alloc] init];
@@ -144,13 +85,31 @@ typedef struct ASRangeGeometry ASRangeGeometry;
return indexPathSet;
}
#pragma mark -
#pragma mark Should Update Range
- (BOOL)shouldUpdateForVisibleIndexPaths:(NSArray *)indexPaths
viewportSize:(CGSize)viewportSize
rangeType:(ASLayoutRangeType)rangeType
- (ASRangeGeometry)rangeGeometryWithScrollDirection:(ASScrollDirection)scrollDirection
tuningParameters:(ASRangeTuningParameters)tuningParameters
{
CGRect rangeBounds = _collectionView.bounds;
CGRect updateBounds = _collectionView.bounds;
// Scrollable directions can change for non-flow layouts
if ([_collectionViewLayout asdk_isFlowLayout] == NO) {
_scrollableDirections = [_collectionView scrollableDirections];
}
rangeBounds = CGRectExpandToRangeWithScrollableDirections(rangeBounds, tuningParameters, _scrollableDirections, scrollDirection);
ASRangeTuningParameters updateTuningParameters = tuningParameters;
updateTuningParameters.leadingBufferScreenfuls = MIN(updateTuningParameters.leadingBufferScreenfuls * 0.5, 0.95);
updateTuningParameters.trailingBufferScreenfuls = MIN(updateTuningParameters.trailingBufferScreenfuls * 0.5, 0.95);
updateBounds = CGRectExpandToRangeWithScrollableDirections(updateBounds, updateTuningParameters, _scrollableDirections, scrollDirection);
return {rangeBounds, updateBounds};
}
- (BOOL)shouldUpdateForVisibleIndexPaths:(NSArray *)indexPaths rangeType:(ASLayoutRangeType)rangeType
{
CGSize viewportSize = [self viewportSize];
CGRect updateRangeBounds = _updateRangeBoundsIndexedByRangeType[rangeType];
if (CGRectIsEmpty(updateRangeBounds)) {
return YES;
@@ -169,3 +128,40 @@ typedef struct ASRangeGeometry ASRangeGeometry;
}
@end
@implementation ASCollectionViewLayoutControllerBeta
- (NSSet *)indexPathsForScrolling:(ASScrollDirection)scrollDirection rangeType:(ASLayoutRangeType)rangeType
{
ASRangeTuningParameters tuningParameters = [self tuningParametersForRangeType:rangeType];
CGRect rangeBounds = [self rangeBoundsWithScrollDirection:scrollDirection rangeTuningParameters:tuningParameters];
return [self indexPathsForItemsWithinRangeBounds:rangeBounds];
}
- (NSSet *)indexPathsForItemsWithinRangeBounds:(CGRect)rangeBounds
{
NSArray *layoutAttributes = [_collectionViewLayout layoutAttributesForElementsInRect:rangeBounds];
NSMutableSet *indexPathSet = [NSMutableSet setWithCapacity:layoutAttributes.count];
for (UICollectionViewLayoutAttributes *la in layoutAttributes) {
//ASDisplayNodeAssert(![indexPathSet containsObject:la.indexPath], @"Shouldn't already contain indexPath");
ASDisplayNodeAssert(la.representedElementCategory != UICollectionElementCategoryDecorationView, @"UICollectionView decoration views are not supported by ASCollectionView");
[indexPathSet addObject:la.indexPath];
}
return indexPathSet;
}
- (CGRect)rangeBoundsWithScrollDirection:(ASScrollDirection)scrollDirection
rangeTuningParameters:(ASRangeTuningParameters)tuningParameters
{
CGRect rect = _collectionView.bounds;
// Scrollable directions can change for non-flow layouts
if ([_collectionViewLayout asdk_isFlowLayout] == NO) {
_scrollableDirections = [_collectionView scrollableDirections];
}
return CGRectExpandToRangeWithScrollableDirections(rect, tuningParameters, _scrollableDirections, scrollDirection);
}
@end