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PSTCollectionView.m
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PSTCollectionView.m
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//
// PSTCollectionView.m
// PSPDFKit
//
// Copyright (c) 2012-2013 Peter Steinberger. All rights reserved.
//
#import "PSTCollectionView.h"
#import "PSTCollectionViewData.h"
#import "PSTCollectionViewLayout+Internals.h"
#import "PSTCollectionViewItemKey.h"
#import <objc/runtime.h>
@interface PSTCollectionViewLayout (Internal)
@property (nonatomic, unsafe_unretained) PSTCollectionView *collectionView;
@end
@interface PSTCollectionViewData (Internal)
- (void)prepareToLoadData;
@end
@interface PSTCollectionViewCell (Internal)
- (void)performSelectionSegue;
@end
@interface PSTCollectionViewUpdateItem ()
- (NSIndexPath *)indexPath;
- (BOOL)isSectionOperation;
@end
@interface PSTCollectionViewLayoutAttributes ()
@property (nonatomic, copy) NSString *elementKind;
@end
CGFloat PSTSimulatorAnimationDragCoefficient(void);
@class PSTCollectionViewExt;
@interface PSTCollectionView () <UIScrollViewDelegate> {
// ivar layout needs to EQUAL to UICollectionView.
PSTCollectionViewLayout *_layout;
__unsafe_unretained id<PSTCollectionViewDataSource> _dataSource;
UIView *_backgroundView;
NSMutableSet *_indexPathsForSelectedItems;
NSMutableDictionary *_cellReuseQueues;
NSMutableDictionary *_supplementaryViewReuseQueues;
NSMutableDictionary *_decorationViewReuseQueues;
NSMutableSet *_indexPathsForHighlightedItems;
int _reloadingSuspendedCount;
PSTCollectionReusableView *_firstResponderView;
UIView *_newContentView;
int _firstResponderViewType;
NSString *_firstResponderViewKind;
NSIndexPath *_firstResponderIndexPath;
NSMutableDictionary *_allVisibleViewsDict;
NSIndexPath *_pendingSelectionIndexPath;
NSMutableSet *_pendingDeselectionIndexPaths;
PSTCollectionViewData *_collectionViewData;
id _update;
CGRect _visibleBoundRects;
CGRect _preRotationBounds;
CGPoint _rotationBoundsOffset;
int _rotationAnimationCount;
int _updateCount;
NSMutableArray *_insertItems;
NSMutableArray *_deleteItems;
NSMutableArray *_reloadItems;
NSMutableArray *_moveItems;
NSArray *_originalInsertItems;
NSArray *_originalDeleteItems;
UITouch *_currentTouch;
void (^_updateCompletionHandler)(BOOL finished);
NSMutableDictionary *_cellClassDict;
NSMutableDictionary *_cellNibDict;
NSMutableDictionary *_supplementaryViewClassDict;
NSMutableDictionary *_supplementaryViewNibDict;
NSMutableDictionary *_cellNibExternalObjectsTables;
NSMutableDictionary *_supplementaryViewNibExternalObjectsTables;
struct {
unsigned int delegateShouldHighlightItemAtIndexPath : 1;
unsigned int delegateDidHighlightItemAtIndexPath : 1;
unsigned int delegateDidUnhighlightItemAtIndexPath : 1;
unsigned int delegateShouldSelectItemAtIndexPath : 1;
unsigned int delegateShouldDeselectItemAtIndexPath : 1;
unsigned int delegateDidSelectItemAtIndexPath : 1;
unsigned int delegateDidDeselectItemAtIndexPath : 1;
unsigned int delegateSupportsMenus : 1;
unsigned int delegateDidEndDisplayingCell : 1;
unsigned int delegateDidEndDisplayingSupplementaryView : 1;
unsigned int dataSourceNumberOfSections : 1;
unsigned int dataSourceViewForSupplementaryElement : 1;
unsigned int reloadSkippedDuringSuspension : 1;
unsigned int scheduledUpdateVisibleCells : 1;
unsigned int scheduledUpdateVisibleCellLayoutAttributes : 1;
unsigned int allowsSelection : 1;
unsigned int allowsMultipleSelection : 1;
unsigned int updating : 1;
unsigned int fadeCellsForBoundsChange : 1;
unsigned int updatingLayout : 1;
unsigned int needsReload : 1;
unsigned int reloading : 1;
unsigned int skipLayoutDuringSnapshotting : 1;
unsigned int layoutInvalidatedSinceLastCellUpdate : 1;
unsigned int doneFirstLayout : 1;
}_collectionViewFlags;
CGPoint _lastLayoutOffset;
char filler[200]; // [HACK] Our class needs to be larged than Apple's class for the superclass change to work
}
@property (nonatomic, strong) PSTCollectionViewData *collectionViewData;
@property (nonatomic, strong, readonly) PSTCollectionViewExt *extVars;
@property (nonatomic, readonly) id currentUpdate;
@property (nonatomic, readonly) NSDictionary *visibleViewsDict;
@property (nonatomic, assign) CGRect visibleBoundRects;
@end
// Used by PSTCollectionView for external variables.
// (We need to keep the total class size equal to the UICollectionView variant)
@interface PSTCollectionViewExt : NSObject
@property (nonatomic, unsafe_unretained) id<PSTCollectionViewDelegate> collectionViewDelegate;
@property (nonatomic, strong) PSTCollectionViewLayout *nibLayout;
@property (nonatomic, strong) NSDictionary *nibCellsExternalObjects;
@property (nonatomic, strong) NSDictionary *supplementaryViewsExternalObjects;
@property (nonatomic, strong) NSIndexPath *touchingIndexPath;
@property (nonatomic, strong) NSIndexPath *currentIndexPath;
@end
@implementation PSTCollectionViewExt
@end
const char kPSTColletionViewExt;
@implementation PSTCollectionView
@synthesize collectionViewLayout = _layout;
@synthesize currentUpdate = _update;
@synthesize visibleViewsDict = _allVisibleViewsDict;
///////////////////////////////////////////////////////////////////////////////////////////
#pragma mark - NSObject
static void PSTCollectionViewCommonSetup(PSTCollectionView *_self) {
_self.allowsSelection = YES;
_self->_indexPathsForSelectedItems = [NSMutableSet new];
_self->_indexPathsForHighlightedItems = [NSMutableSet new];
_self->_cellReuseQueues = [NSMutableDictionary new];
_self->_supplementaryViewReuseQueues = [NSMutableDictionary new];
_self->_decorationViewReuseQueues = [NSMutableDictionary new];
_self->_allVisibleViewsDict = [NSMutableDictionary new];
_self->_cellClassDict = [NSMutableDictionary new];
_self->_cellNibDict = [NSMutableDictionary new];
_self->_supplementaryViewClassDict = [NSMutableDictionary new];
_self->_supplementaryViewNibDict = [NSMutableDictionary new];
// add class that saves additional ivars
objc_setAssociatedObject(_self, &kPSTColletionViewExt, [PSTCollectionViewExt new], OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (id)initWithFrame:(CGRect)frame {
return [self initWithFrame:frame collectionViewLayout:nil];
}
- (id)initWithFrame:(CGRect)frame collectionViewLayout:(PSTCollectionViewLayout *)layout {
if ((self = [super initWithFrame:frame])) {
// Set self as the UIScrollView's delegate
[super setDelegate:self];
PSTCollectionViewCommonSetup(self);
self.collectionViewLayout = layout;
_collectionViewData = [[PSTCollectionViewData alloc] initWithCollectionView:self layout:layout];
}
return self;
}
- (id)initWithCoder:(NSCoder *)inCoder {
if ((self = [super initWithCoder:inCoder])) {
// Set self as the UIScrollView's delegate
[super setDelegate:self];
PSTCollectionViewCommonSetup(self);
self.extVars.nibLayout = [inCoder decodeObjectForKey:@"UICollectionLayout"];
NSDictionary *cellExternalObjects = [inCoder decodeObjectForKey:@"UICollectionViewCellPrototypeNibExternalObjects"];
NSDictionary *cellNibs = [inCoder decodeObjectForKey:@"UICollectionViewCellNibDict"];
for (NSString *identifier in cellNibs.allKeys) {
_cellNibDict[identifier] = cellNibs[identifier];
}
self.extVars.nibCellsExternalObjects = cellExternalObjects;
NSDictionary *supplementaryViewExternalObjects = [inCoder decodeObjectForKey:@"UICollectionViewSupplementaryViewPrototypeNibExternalObjects"];
NSDictionary *supplementaryViewNibs = [inCoder decodeObjectForKey:@"UICollectionViewSupplementaryViewNibDict"];
for (NSString *identifier in supplementaryViewNibs.allKeys) {
_supplementaryViewNibDict[identifier] = supplementaryViewNibs[identifier];
}
self.extVars.supplementaryViewsExternalObjects = supplementaryViewExternalObjects;
}
return self;
}
- (void)awakeFromNib {
[super awakeFromNib];
PSTCollectionViewLayout *nibLayout = self.extVars.nibLayout;
if (nibLayout) {
self.collectionViewLayout = nibLayout;
self.extVars.nibLayout = nil;
}
}
- (NSString *)description {
return [NSString stringWithFormat:@"%@ collection view layout: %@", [super description], self.collectionViewLayout];
}
///////////////////////////////////////////////////////////////////////////////////////////
#pragma mark - UIView
- (void)layoutSubviews {
[super layoutSubviews];
// Adding alpha animation to make the relayouting smooth
if (_collectionViewFlags.fadeCellsForBoundsChange) {
CATransition *transition = [CATransition animation];
transition.duration = 0.25f * PSTSimulatorAnimationDragCoefficient();
transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
transition.type = kCATransitionFade;
[self.layer addAnimation:transition forKey:@"rotationAnimation"];
}
[_collectionViewData validateLayoutInRect:self.bounds];
// update cells
if (_collectionViewFlags.fadeCellsForBoundsChange) {
[CATransaction begin];
[CATransaction setDisableActions:YES];
}
if (!_collectionViewFlags.updatingLayout)
[self updateVisibleCellsNow:YES];
if (_collectionViewFlags.fadeCellsForBoundsChange) {
[CATransaction commit];
}
// do we need to update contentSize?
CGSize contentSize = [_collectionViewData collectionViewContentRect].size;
if (!CGSizeEqualToSize(self.contentSize, contentSize)) {
self.contentSize = contentSize;
// if contentSize is different, we need to re-evaluate layout, bounds (contentOffset) might changed
[_collectionViewData validateLayoutInRect:self.bounds];
[self updateVisibleCellsNow:YES];
}
if (_backgroundView) {
_backgroundView.frame = (CGRect){.origin=self.contentOffset, .size=self.bounds.size};
}
_collectionViewFlags.fadeCellsForBoundsChange = NO;
_collectionViewFlags.doneFirstLayout = YES;
}
- (void)setFrame:(CGRect)frame {
if (!CGRectEqualToRect(frame, self.frame)) {
[super setFrame:frame];
if ([self.collectionViewLayout shouldInvalidateLayoutForBoundsChange:self.bounds]) {
[self invalidateLayout];
_collectionViewFlags.fadeCellsForBoundsChange = YES;
}
}
}
///////////////////////////////////////////////////////////////////////////////////////////
#pragma mark - UIScrollViewDelegate
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
id<PSTCollectionViewDelegate> delegate = self.extVars.collectionViewDelegate;
if ((id)delegate != self && [delegate respondsToSelector:@selector(scrollViewDidScroll:)]) {
[delegate scrollViewDidScroll:scrollView];
}
}
- (void)scrollViewDidZoom:(UIScrollView *)scrollView {
id<PSTCollectionViewDelegate> delegate = self.extVars.collectionViewDelegate;
if ((id)delegate != self && [delegate respondsToSelector:@selector(scrollViewDidZoom:)]) {
[delegate scrollViewDidZoom:scrollView];
}
}
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
id<PSTCollectionViewDelegate> delegate = self.extVars.collectionViewDelegate;
if ((id)delegate != self && [delegate respondsToSelector:@selector(scrollViewWillBeginDragging:)]) {
[delegate scrollViewWillBeginDragging:scrollView];
}
}
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset {
// Let collectionViewLayout decide where to stop.
*targetContentOffset = [[self collectionViewLayout] targetContentOffsetForProposedContentOffset:*targetContentOffset withScrollingVelocity:velocity];
id<PSTCollectionViewDelegate> delegate = self.extVars.collectionViewDelegate;
if ((id)delegate != self && [delegate respondsToSelector:@selector(scrollViewWillEndDragging:withVelocity:targetContentOffset:)]) {
//if collectionViewDelegate implements this method, it may modify targetContentOffset as well
[delegate scrollViewWillEndDragging:scrollView withVelocity:velocity targetContentOffset:targetContentOffset];
}
}
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
id<PSTCollectionViewDelegate> delegate = self.extVars.collectionViewDelegate;
if ((id)delegate != self && [delegate respondsToSelector:@selector(scrollViewDidEndDragging:willDecelerate:)]) {
[delegate scrollViewDidEndDragging:scrollView willDecelerate:decelerate];
}
// if we are in the middle of a cell touch event, perform the "touchEnded" simulation
if (self.extVars.touchingIndexPath) {
[self cellTouchCancelled];
}
}
- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView {
id<PSTCollectionViewDelegate> delegate = self.extVars.collectionViewDelegate;
if ((id)delegate != self && [delegate respondsToSelector:@selector(scrollViewWillBeginDecelerating:)]) {
[delegate scrollViewWillBeginDecelerating:scrollView];
}
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
id<PSTCollectionViewDelegate> delegate = self.extVars.collectionViewDelegate;
if ((id)delegate != self && [delegate respondsToSelector:@selector(scrollViewDidEndDecelerating:)]) {
[delegate scrollViewDidEndDecelerating:scrollView];
}
}
- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView {
id<PSTCollectionViewDelegate> delegate = self.extVars.collectionViewDelegate;
if ((id)delegate != self && [delegate respondsToSelector:@selector(scrollViewDidEndScrollingAnimation:)]) {
[delegate scrollViewDidEndScrollingAnimation:scrollView];
}
}
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {
id<PSTCollectionViewDelegate> delegate = self.extVars.collectionViewDelegate;
if ((id)delegate != self && [delegate respondsToSelector:@selector(viewForZoomingInScrollView:)]) {
return [delegate viewForZoomingInScrollView:scrollView];
}
return nil;
}
- (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view {
id<PSTCollectionViewDelegate> delegate = self.extVars.collectionViewDelegate;
if ((id)delegate != self && [delegate respondsToSelector:@selector(scrollViewWillBeginZooming:withView:)]) {
[delegate scrollViewWillBeginZooming:scrollView withView:view];
}
}
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale {
id<PSTCollectionViewDelegate> delegate = self.extVars.collectionViewDelegate;
if ((id)delegate != self && [delegate respondsToSelector:@selector(scrollViewDidEndZooming:withView:atScale:)]) {
[delegate scrollViewDidEndZooming:scrollView withView:view atScale:scale];
}
}
- (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView {
id<PSTCollectionViewDelegate> delegate = self.extVars.collectionViewDelegate;
if ((id)delegate != self && [delegate respondsToSelector:@selector(scrollViewShouldScrollToTop:)]) {
return [delegate scrollViewShouldScrollToTop:scrollView];
}
return YES;
}
- (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView {
id<PSTCollectionViewDelegate> delegate = self.extVars.collectionViewDelegate;
if ((id)delegate != self && [delegate respondsToSelector:@selector(scrollViewDidScrollToTop:)]) {
[delegate scrollViewDidScrollToTop:scrollView];
}
}
///////////////////////////////////////////////////////////////////////////////////////////
#pragma mark - Public
- (void)registerClass:(Class)cellClass forCellWithReuseIdentifier:(NSString *)identifier {
NSParameterAssert(cellClass);
NSParameterAssert(identifier);
_cellClassDict[identifier] = cellClass;
}
- (void)registerClass:(Class)viewClass forSupplementaryViewOfKind:(NSString *)elementKind withReuseIdentifier:(NSString *)identifier {
NSParameterAssert(viewClass);
NSParameterAssert(elementKind);
NSParameterAssert(identifier);
NSString *kindAndIdentifier = [NSString stringWithFormat:@"%@/%@", elementKind, identifier];
_supplementaryViewClassDict[kindAndIdentifier] = viewClass;
}
- (void)registerNib:(UINib *)nib forCellWithReuseIdentifier:(NSString *)identifier {
NSArray *topLevelObjects = [nib instantiateWithOwner:nil options:nil];
#pragma unused(topLevelObjects)
NSAssert(topLevelObjects.count == 1 && [topLevelObjects[0] isKindOfClass:PSTCollectionViewCell.class], @"must contain exactly 1 top level object which is a PSTCollectionViewCell");
_cellNibDict[identifier] = nib;
}
- (void)registerNib:(UINib *)nib forSupplementaryViewOfKind:(NSString *)kind withReuseIdentifier:(NSString *)identifier {
NSArray *topLevelObjects = [nib instantiateWithOwner:nil options:nil];
#pragma unused(topLevelObjects)
NSAssert(topLevelObjects.count == 1 && [topLevelObjects[0] isKindOfClass:PSTCollectionReusableView.class], @"must contain exactly 1 top level object which is a PSTCollectionReusableView");
NSString *kindAndIdentifier = [NSString stringWithFormat:@"%@/%@", kind, identifier];
_supplementaryViewNibDict[kindAndIdentifier] = nib;
}
- (id)dequeueReusableCellWithReuseIdentifier:(NSString *)identifier forIndexPath:(NSIndexPath *)indexPath {
// de-queue cell (if available)
NSMutableArray *reusableCells = _cellReuseQueues[identifier];
PSTCollectionViewCell *cell = [reusableCells lastObject];
PSTCollectionViewLayoutAttributes *attributes = [self.collectionViewLayout layoutAttributesForItemAtIndexPath:indexPath];
if (cell) {
[reusableCells removeObjectAtIndex:reusableCells.count - 1];
}else {
if (_cellNibDict[identifier]) {
// Cell was registered via registerNib:forCellWithReuseIdentifier:
UINib *cellNib = _cellNibDict[identifier];
NSDictionary *externalObjects = self.extVars.nibCellsExternalObjects[identifier];
if (externalObjects) {
cell = [cellNib instantiateWithOwner:self options:@{UINibExternalObjects : externalObjects}][0];
}else {
cell = [cellNib instantiateWithOwner:self options:nil][0];
}
}else {
Class cellClass = _cellClassDict[identifier];
// compatibility layer
Class collectionViewCellClass = NSClassFromString(@"UICollectionViewCell");
if (collectionViewCellClass && [cellClass isEqual:collectionViewCellClass]) {
cellClass = PSTCollectionViewCell.class;
}
if (cellClass == nil) {
@throw [NSException exceptionWithName:NSInvalidArgumentException reason:[NSString stringWithFormat:@"Class not registered for identifier %@", identifier] userInfo:nil];
}
if (attributes) {
cell = [[cellClass alloc] initWithFrame:attributes.frame];
}else {
cell = [cellClass new];
}
}
PSTCollectionViewLayout *layout = [self collectionViewLayout];
if ([layout isKindOfClass:PSTCollectionViewFlowLayout.class]) {
CGSize itemSize = ((PSTCollectionViewFlowLayout *)layout).itemSize;
cell.bounds = CGRectMake(0, 0, itemSize.width, itemSize.height);
}
cell.collectionView = self;
cell.reuseIdentifier = identifier;
}
[cell applyLayoutAttributes:attributes];
return cell;
}
- (id)dequeueReusableSupplementaryViewOfKind:(NSString *)elementKind withReuseIdentifier:(NSString *)identifier forIndexPath:(NSIndexPath *)indexPath {
NSString *kindAndIdentifier = [NSString stringWithFormat:@"%@/%@", elementKind, identifier];
NSMutableArray *reusableViews = _supplementaryViewReuseQueues[kindAndIdentifier];
PSTCollectionReusableView *view = [reusableViews lastObject];
if (view) {
[reusableViews removeObjectAtIndex:reusableViews.count - 1];
}else {
if (_supplementaryViewNibDict[kindAndIdentifier]) {
// supplementary view was registered via registerNib:forCellWithReuseIdentifier:
UINib *supplementaryViewNib = _supplementaryViewNibDict[kindAndIdentifier];
NSDictionary *externalObjects = self.extVars.supplementaryViewsExternalObjects[kindAndIdentifier];
if (externalObjects) {
view = [supplementaryViewNib instantiateWithOwner:self options:@{UINibExternalObjects : externalObjects}][0];
}else {
view = [supplementaryViewNib instantiateWithOwner:self options:nil][0];
}
}else {
Class viewClass = _supplementaryViewClassDict[kindAndIdentifier];
Class reusableViewClass = NSClassFromString(@"UICollectionReusableView");
if (reusableViewClass && [viewClass isEqual:reusableViewClass]) {
viewClass = PSTCollectionReusableView.class;
}
if (viewClass == nil) {
@throw [NSException exceptionWithName:NSInvalidArgumentException reason:[NSString stringWithFormat:@"Class not registered for kind/identifier %@", kindAndIdentifier] userInfo:nil];
}
if (self.collectionViewLayout) {
PSTCollectionViewLayoutAttributes *attributes = [self.collectionViewLayout layoutAttributesForSupplementaryViewOfKind:elementKind atIndexPath:indexPath];
if (attributes) {
view = [[viewClass alloc] initWithFrame:attributes.frame];
}
}else {
view = [viewClass new];
}
}
view.collectionView = self;
view.reuseIdentifier = identifier;
}
return view;
}
- (id)dequeueReusableOrCreateDecorationViewOfKind:(NSString *)elementKind forIndexPath:(NSIndexPath *)indexPath {
NSMutableArray *reusableViews = _decorationViewReuseQueues[elementKind];
PSTCollectionReusableView *view = [reusableViews lastObject];
PSTCollectionViewLayout *collectionViewLayout = self.collectionViewLayout;
PSTCollectionViewLayoutAttributes *attributes = [collectionViewLayout layoutAttributesForDecorationViewOfKind:elementKind atIndexPath:indexPath];
if (view) {
[reusableViews removeObjectAtIndex:reusableViews.count - 1];
}else {
NSDictionary *decorationViewNibDict = collectionViewLayout.decorationViewNibDict;
NSDictionary *decorationViewExternalObjects = collectionViewLayout.decorationViewExternalObjectsTables;
if (decorationViewNibDict[elementKind]) {
// supplementary view was registered via registerNib:forCellWithReuseIdentifier:
UINib *supplementaryViewNib = decorationViewNibDict[elementKind];
NSDictionary *externalObjects = decorationViewExternalObjects[elementKind];
if (externalObjects) {
view = [supplementaryViewNib instantiateWithOwner:self options:@{UINibExternalObjects : externalObjects}][0];
}else {
view = [supplementaryViewNib instantiateWithOwner:self options:nil][0];
}
}else {
NSDictionary *decorationViewClassDict = collectionViewLayout.decorationViewClassDict;
Class viewClass = decorationViewClassDict[elementKind];
Class reusableViewClass = NSClassFromString(@"UICollectionReusableView");
if (reusableViewClass && [viewClass isEqual:reusableViewClass]) {
viewClass = PSTCollectionReusableView.class;
}
if (viewClass == nil) {
@throw [NSException exceptionWithName:NSInvalidArgumentException reason:[NSString stringWithFormat:@"Class not registered for identifier %@", elementKind] userInfo:nil];
}
if (attributes) {
view = [[viewClass alloc] initWithFrame:attributes.frame];
}else {
view = [viewClass new];
}
}
view.collectionView = self;
view.reuseIdentifier = elementKind;
}
[view applyLayoutAttributes:attributes];
return view;
}
- (NSArray *)allCells {
return [[_allVisibleViewsDict allValues] filteredArrayUsingPredicate:[NSPredicate predicateWithBlock:^BOOL(id evaluatedObject, NSDictionary *bindings) {
return [evaluatedObject isKindOfClass:PSTCollectionViewCell.class];
}]];
}
- (NSArray *)visibleCells {
return [[_allVisibleViewsDict allValues] filteredArrayUsingPredicate:[NSPredicate predicateWithBlock:^BOOL(id evaluatedObject, NSDictionary *bindings) {
return [evaluatedObject isKindOfClass:PSTCollectionViewCell.class] && CGRectIntersectsRect(self.bounds, [evaluatedObject frame]);
}]];
}
- (void)reloadData {
if (_reloadingSuspendedCount != 0) return;
[self invalidateLayout];
[_allVisibleViewsDict enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) {
if ([obj isKindOfClass:UIView.class]) {
[obj removeFromSuperview];
}
}];
[_allVisibleViewsDict removeAllObjects];
for (NSIndexPath *indexPath in _indexPathsForSelectedItems) {
PSTCollectionViewCell *selectedCell = [self cellForItemAtIndexPath:indexPath];
selectedCell.selected = NO;
selectedCell.highlighted = NO;
}
[_indexPathsForSelectedItems removeAllObjects];
[_indexPathsForHighlightedItems removeAllObjects];
[self setNeedsLayout];
}
///////////////////////////////////////////////////////////////////////////////////////////
#pragma mark - Query Grid
- (NSInteger)numberOfSections {
return [_collectionViewData numberOfSections];
}
- (NSInteger)numberOfItemsInSection:(NSInteger)section {
return [_collectionViewData numberOfItemsInSection:section];
}
- (PSTCollectionViewLayoutAttributes *)layoutAttributesForItemAtIndexPath:(NSIndexPath *)indexPath {
return [[self collectionViewLayout] layoutAttributesForItemAtIndexPath:indexPath];
}
- (PSTCollectionViewLayoutAttributes *)layoutAttributesForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath {
return [[self collectionViewLayout] layoutAttributesForSupplementaryViewOfKind:kind atIndexPath:indexPath];
}
- (NSIndexPath *)indexPathForItemAtPoint:(CGPoint)point {
__block NSIndexPath *indexPath = nil;
[_allVisibleViewsDict enumerateKeysAndObjectsWithOptions:kNilOptions usingBlock:^(id key, id obj, BOOL *stop) {
PSTCollectionViewItemKey *itemKey = (PSTCollectionViewItemKey *)key;
if (itemKey.type == PSTCollectionViewItemTypeCell) {
PSTCollectionViewCell *cell = (PSTCollectionViewCell *)obj;
if (CGRectContainsPoint(cell.frame, point)) {
indexPath = itemKey.indexPath;
*stop = YES;
}
}
}];
return indexPath;
}
- (NSIndexPath *)indexPathForCell:(PSTCollectionViewCell *)cell {
__block NSIndexPath *indexPath = nil;
[_allVisibleViewsDict enumerateKeysAndObjectsWithOptions:kNilOptions usingBlock:^(id key, id obj, BOOL *stop) {
PSTCollectionViewItemKey *itemKey = (PSTCollectionViewItemKey *)key;
if (itemKey.type == PSTCollectionViewItemTypeCell) {
PSTCollectionViewCell *currentCell = (PSTCollectionViewCell *)obj;
if (currentCell == cell) {
indexPath = itemKey.indexPath;
*stop = YES;
}
}
}];
return indexPath;
}
- (PSTCollectionViewCell *)cellForItemAtIndexPath:(NSIndexPath *)indexPath {
// NSInteger index = [_collectionViewData globalIndexForItemAtIndexPath:indexPath];
// TODO Apple uses some kind of globalIndex for this.
__block PSTCollectionViewCell *cell = nil;
[_allVisibleViewsDict enumerateKeysAndObjectsWithOptions:0 usingBlock:^(id key, id obj, BOOL *stop) {
PSTCollectionViewItemKey *itemKey = (PSTCollectionViewItemKey *)key;
if (itemKey.type == PSTCollectionViewItemTypeCell) {
if ([itemKey.indexPath isEqual:indexPath]) {
cell = obj;
*stop = YES;
}
}
}];
return cell;
}
- (NSArray *)indexPathsForVisibleItems {
NSArray *visibleCells = self.visibleCells;
NSMutableArray *indexPaths = [NSMutableArray arrayWithCapacity:visibleCells.count];
[visibleCells enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
PSTCollectionViewCell *cell = (PSTCollectionViewCell *)obj;
[indexPaths addObject:cell.layoutAttributes.indexPath];
}];
return indexPaths;
}
// returns nil or an array of selected index paths
- (NSArray *)indexPathsForSelectedItems {
return [_indexPathsForSelectedItems allObjects];
}
// Interacting with the collection view.
- (void)scrollToItemAtIndexPath:(NSIndexPath *)indexPath atScrollPosition:(PSTCollectionViewScrollPosition)scrollPosition animated:(BOOL)animated {
// Ensure grid is laid out; else we can't scroll.
[self layoutSubviews];
PSTCollectionViewLayoutAttributes *layoutAttributes = [self.collectionViewLayout layoutAttributesForItemAtIndexPath:indexPath];
if (layoutAttributes) {
CGRect targetRect = [self makeRect:layoutAttributes.frame toScrollPosition:scrollPosition];
[self scrollRectToVisible:targetRect animated:animated];
}
}
- (CGRect)makeRect:(CGRect)targetRect toScrollPosition:(PSTCollectionViewScrollPosition)scrollPosition {
// split parameters
NSUInteger verticalPosition = scrollPosition&0x07; // 0000 0111
NSUInteger horizontalPosition = scrollPosition&0x38; // 0011 1000
if (verticalPosition != PSTCollectionViewScrollPositionNone
&& verticalPosition != PSTCollectionViewScrollPositionTop
&& verticalPosition != PSTCollectionViewScrollPositionCenteredVertically
&& verticalPosition != PSTCollectionViewScrollPositionBottom) {
@throw [NSException exceptionWithName:NSInvalidArgumentException reason:@"PSTCollectionViewScrollPosition: attempt to use a scroll position with multiple vertical positioning styles" userInfo:nil];
}
if (horizontalPosition != PSTCollectionViewScrollPositionNone
&& horizontalPosition != PSTCollectionViewScrollPositionLeft
&& horizontalPosition != PSTCollectionViewScrollPositionCenteredHorizontally
&& horizontalPosition != PSTCollectionViewScrollPositionRight) {
@throw [NSException exceptionWithName:NSInvalidArgumentException reason:@"PSTCollectionViewScrollPosition: attempt to use a scroll position with multiple horizontal positioning styles" userInfo:nil];
}
CGRect frame = self.layer.bounds;
CGFloat calculateX;
CGFloat calculateY;
switch (verticalPosition) {
case PSTCollectionViewScrollPositionCenteredVertically:
calculateY = fmaxf(targetRect.origin.y - ((frame.size.height / 2) - (targetRect.size.height / 2)), -self.contentInset.top);
targetRect = CGRectMake(targetRect.origin.x, calculateY, targetRect.size.width, frame.size.height);
break;
case PSTCollectionViewScrollPositionTop:
targetRect = CGRectMake(targetRect.origin.x, targetRect.origin.y, targetRect.size.width, frame.size.height);
break;
case PSTCollectionViewScrollPositionBottom:
calculateY = fmaxf(targetRect.origin.y - (frame.size.height - targetRect.size.height), -self.contentInset.top);
targetRect = CGRectMake(targetRect.origin.x, calculateY, targetRect.size.width, frame.size.height);
break;
}
switch (horizontalPosition) {
case PSTCollectionViewScrollPositionCenteredHorizontally:
calculateX = targetRect.origin.x - ((frame.size.width / 2) - (targetRect.size.width / 2));
targetRect = CGRectMake(calculateX, targetRect.origin.y, frame.size.width, targetRect.size.height);
break;
case PSTCollectionViewScrollPositionLeft:
targetRect = CGRectMake(targetRect.origin.x, targetRect.origin.y, frame.size.width, targetRect.size.height);
break;
case PSTCollectionViewScrollPositionRight:
calculateX = targetRect.origin.x - (frame.size.width - targetRect.size.width);
targetRect = CGRectMake(calculateX, targetRect.origin.y, frame.size.width, targetRect.size.height);
break;
}
return targetRect;
}
///////////////////////////////////////////////////////////////////////////////////////////
#pragma mark - Touch Handling
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
[super touchesBegan:touches withEvent:event];
// reset touching state vars
self.extVars.touchingIndexPath = nil;
self.extVars.currentIndexPath = nil;
CGPoint touchPoint = [[touches anyObject] locationInView:self];
NSIndexPath *indexPath = [self indexPathForItemAtPoint:touchPoint];
if (indexPath && self.allowsSelection) {
if (![self highlightItemAtIndexPath:indexPath animated:YES scrollPosition:PSTCollectionViewScrollPositionNone notifyDelegate:YES])
return;
self.extVars.touchingIndexPath = indexPath;
self.extVars.currentIndexPath = indexPath;
if (!self.allowsMultipleSelection) {
// temporally unhighlight background on touchesBegan (keeps selected by _indexPathsForSelectedItems)
// single-select only mode only though
NSIndexPath *tempDeselectIndexPath = _indexPathsForSelectedItems.anyObject;
if (tempDeselectIndexPath && ![tempDeselectIndexPath isEqual:self.extVars.touchingIndexPath]) {
// iOS6 UICollectionView deselects cell without notification
PSTCollectionViewCell *selectedCell = [self cellForItemAtIndexPath:tempDeselectIndexPath];
selectedCell.selected = NO;
}
}
}
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
[super touchesMoved:touches withEvent:event];
// allows moving between highlight and unhighlight state only if setHighlighted is not overwritten
if (self.extVars.touchingIndexPath) {
CGPoint touchPoint = [[touches anyObject] locationInView:self];
NSIndexPath *indexPath = [self indexPathForItemAtPoint:touchPoint];
// moving out of bounds
if ([self.extVars.currentIndexPath isEqual:self.extVars.touchingIndexPath] &&
![indexPath isEqual:self.extVars.touchingIndexPath] &&
[self unhighlightItemAtIndexPath:self.extVars.touchingIndexPath animated:YES notifyDelegate:YES shouldCheckHighlight:YES]) {
self.extVars.currentIndexPath = indexPath;
// moving back into the original touching cell
}else if (![self.extVars.currentIndexPath isEqual:self.extVars.touchingIndexPath] &&
[indexPath isEqual:self.extVars.touchingIndexPath]) {
[self highlightItemAtIndexPath:self.extVars.touchingIndexPath animated:YES scrollPosition:PSTCollectionViewScrollPositionNone notifyDelegate:YES];
self.extVars.currentIndexPath = self.extVars.touchingIndexPath;
}
}
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
[super touchesEnded:touches withEvent:event];
if (self.extVars.touchingIndexPath) {
// first unhighlight the touch operation
[self unhighlightItemAtIndexPath:self.extVars.touchingIndexPath animated:YES notifyDelegate:YES];
CGPoint touchPoint = [[touches anyObject] locationInView:self];
NSIndexPath *indexPath = [self indexPathForItemAtPoint:touchPoint];
if ([indexPath isEqual:self.extVars.touchingIndexPath]) {
[self userSelectedItemAtIndexPath:indexPath];
}
else if (!self.allowsMultipleSelection) {
NSIndexPath *tempDeselectIndexPath = _indexPathsForSelectedItems.anyObject;
if (tempDeselectIndexPath && ![tempDeselectIndexPath isEqual:self.extVars.touchingIndexPath]) {
[self cellTouchCancelled];
}
}
// for pedantic reasons only - always set to nil on touchesBegan
self.extVars.touchingIndexPath = nil;
self.extVars.currentIndexPath = nil;
}
}
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
[super touchesCancelled:touches withEvent:event];
// do not mark touchingIndexPath as nil because whoever cancelled this touch will need to signal a touch up event later
if (self.extVars.touchingIndexPath) {
// first unhighlight the touch operation
[self unhighlightItemAtIndexPath:self.extVars.touchingIndexPath animated:YES notifyDelegate:YES];
}
}
- (void)cellTouchCancelled {
// turn on ALL the *should be selected* cells (iOS6 UICollectionView does no state keeping or other fancy optimizations)
// there should be no notifications as this is a silent "turn everything back on"
for (NSIndexPath *tempDeselectedIndexPath in [_indexPathsForSelectedItems copy]) {
PSTCollectionViewCell *selectedCell = [self cellForItemAtIndexPath:tempDeselectedIndexPath];
selectedCell.selected = YES;
}
}
- (void)userSelectedItemAtIndexPath:(NSIndexPath *)indexPath {
if (self.allowsMultipleSelection && [_indexPathsForSelectedItems containsObject:indexPath]) {
[self deselectItemAtIndexPath:indexPath animated:YES notifyDelegate:YES];
}
else if (self.allowsSelection) {
[self selectItemAtIndexPath:indexPath animated:YES scrollPosition:PSTCollectionViewScrollPositionNone notifyDelegate:YES];
}
}
// select item, notify delegate (internal)
- (void)selectItemAtIndexPath:(NSIndexPath *)indexPath animated:(BOOL)animated scrollPosition:(PSTCollectionViewScrollPosition)scrollPosition notifyDelegate:(BOOL)notifyDelegate {
if (self.allowsMultipleSelection && [_indexPathsForSelectedItems containsObject:indexPath]) {
BOOL shouldDeselect = YES;
if (notifyDelegate && _collectionViewFlags.delegateShouldDeselectItemAtIndexPath) {
shouldDeselect = [self.delegate collectionView:self shouldDeselectItemAtIndexPath:indexPath];
}
if (shouldDeselect) {
[self deselectItemAtIndexPath:indexPath animated:animated notifyDelegate:notifyDelegate];
}
}
else {
// either single selection, or wasn't already selected in multiple selection mode
BOOL shouldSelect = YES;
if (notifyDelegate && _collectionViewFlags.delegateShouldSelectItemAtIndexPath) {
shouldSelect = [self.delegate collectionView:self shouldSelectItemAtIndexPath:indexPath];
}
if (!self.allowsMultipleSelection) {
// now unselect the previously selected cell for single selection
NSIndexPath *tempDeselectIndexPath = _indexPathsForSelectedItems.anyObject;
if (tempDeselectIndexPath && ![tempDeselectIndexPath isEqual:indexPath]) {
[self deselectItemAtIndexPath:tempDeselectIndexPath animated:YES notifyDelegate:YES];
}
}
if (shouldSelect) {
PSTCollectionViewCell *selectedCell = [self cellForItemAtIndexPath:indexPath];
selectedCell.selected = YES;
[_indexPathsForSelectedItems addObject:indexPath];
[selectedCell performSelectionSegue];
if (scrollPosition != PSTCollectionViewScrollPositionNone) {
[self scrollToItemAtIndexPath:indexPath atScrollPosition:scrollPosition animated:animated];
}
if (notifyDelegate && _collectionViewFlags.delegateDidSelectItemAtIndexPath) {
[self.delegate collectionView:self didSelectItemAtIndexPath:indexPath];
}
}
}
}
- (void)selectItemAtIndexPath:(NSIndexPath *)indexPath animated:(BOOL)animated scrollPosition:(PSTCollectionViewScrollPosition)scrollPosition {
[self selectItemAtIndexPath:indexPath animated:animated scrollPosition:scrollPosition notifyDelegate:NO];
}
- (void)deselectItemAtIndexPath:(NSIndexPath *)indexPath animated:(BOOL)animated {
[self deselectItemAtIndexPath:indexPath animated:animated notifyDelegate:NO];
}
- (void)deselectItemAtIndexPath:(NSIndexPath *)indexPath animated:(BOOL)animated notifyDelegate:(BOOL)notifyDelegate {
BOOL shouldDeselect = YES;
// deselect only relevant during multi mode
if (self.allowsMultipleSelection && notifyDelegate && _collectionViewFlags.delegateShouldDeselectItemAtIndexPath) {
shouldDeselect = [self.delegate collectionView:self shouldDeselectItemAtIndexPath:indexPath];
}
if (shouldDeselect && [_indexPathsForSelectedItems containsObject:indexPath]) {
PSTCollectionViewCell *selectedCell = [self cellForItemAtIndexPath:indexPath];
if (selectedCell) {
if (selectedCell.selected) {
selectedCell.selected = NO;
}
}
[_indexPathsForSelectedItems removeObject:indexPath];
if (notifyDelegate && _collectionViewFlags.delegateDidDeselectItemAtIndexPath) {
[self.delegate collectionView:self didDeselectItemAtIndexPath:indexPath];
}
}
}
- (BOOL)highlightItemAtIndexPath:(NSIndexPath *)indexPath animated:(BOOL)animated scrollPosition:(PSTCollectionViewScrollPosition)scrollPosition notifyDelegate:(BOOL)notifyDelegate {
BOOL shouldHighlight = YES;
if (notifyDelegate && _collectionViewFlags.delegateShouldHighlightItemAtIndexPath) {
shouldHighlight = [self.delegate collectionView:self shouldHighlightItemAtIndexPath:indexPath];
}
if (shouldHighlight) {
PSTCollectionViewCell *highlightedCell = [self cellForItemAtIndexPath:indexPath];
highlightedCell.highlighted = YES;
[_indexPathsForHighlightedItems addObject:indexPath];
if (scrollPosition != PSTCollectionViewScrollPositionNone) {
[self scrollToItemAtIndexPath:indexPath atScrollPosition:scrollPosition animated:animated];
}
if (notifyDelegate && _collectionViewFlags.delegateDidHighlightItemAtIndexPath) {
[self.delegate collectionView:self didHighlightItemAtIndexPath:indexPath];
}
}
return shouldHighlight;
}
- (BOOL)unhighlightItemAtIndexPath:(NSIndexPath *)indexPath animated:(BOOL)animated notifyDelegate:(BOOL)notifyDelegate {
return [self unhighlightItemAtIndexPath:indexPath animated:animated notifyDelegate:notifyDelegate shouldCheckHighlight:NO];
}
- (BOOL)unhighlightItemAtIndexPath:(NSIndexPath *)indexPath animated:(BOOL)animated notifyDelegate:(BOOL)notifyDelegate shouldCheckHighlight:(BOOL)check {
if ([_indexPathsForHighlightedItems containsObject:indexPath]) {
PSTCollectionViewCell *highlightedCell = [self cellForItemAtIndexPath:indexPath];
// iOS6 does not notify any delegate if the cell was never highlighted (setHighlighted overwritten) during touchMoved
if (check && !highlightedCell.highlighted) {
return NO;
}
// if multiple selection or not unhighlighting a selected item we don't perform any op
if (highlightedCell.highlighted && [_indexPathsForSelectedItems containsObject:indexPath]) {
highlightedCell.highlighted = YES;
}else {
highlightedCell.highlighted = NO;
}
[_indexPathsForHighlightedItems removeObject:indexPath];
if (notifyDelegate && _collectionViewFlags.delegateDidUnhighlightItemAtIndexPath) {
[self.delegate collectionView:self didUnhighlightItemAtIndexPath:indexPath];
}
return YES;
}
return NO;
}
///////////////////////////////////////////////////////////////////////////////////////////
#pragma mark - Update Grid
- (void)insertSections:(NSIndexSet *)sections {
[self updateSections:sections updateAction:PSTCollectionUpdateActionInsert];
}
- (void)deleteSections:(NSIndexSet *)sections {
// First delete all items
NSMutableArray *paths = [NSMutableArray new];
[sections enumerateIndexesUsingBlock:^(NSUInteger idx, BOOL *stop) {
for (int i = 0; i < [self numberOfItemsInSection:idx]; ++i) {
[paths addObject:[NSIndexPath indexPathForItem:i inSection:idx]];
}
}];
[self deleteItemsAtIndexPaths:paths];
// Then delete the section.
[self updateSections:sections updateAction:PSTCollectionUpdateActionDelete];
}
- (void)reloadSections:(NSIndexSet *)sections {
[self updateSections:sections updateAction:PSTCollectionUpdateActionReload];
}
- (void)moveSection:(NSInteger)section toSection:(NSInteger)newSection {
NSMutableArray *moveUpdateItems = [self arrayForUpdateAction:PSTCollectionUpdateActionMove];
[moveUpdateItems addObject:
[[PSTCollectionViewUpdateItem alloc] initWithInitialIndexPath:[NSIndexPath indexPathForItem:NSNotFound inSection:section]
finalIndexPath:[NSIndexPath indexPathForItem:NSNotFound inSection:newSection]