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Cache TextKitContexts with an array, no key

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This commit is contained in:
Adlai Holler
2016-08-27 18:43:11 -07:00
parent 4954c6bbf7
commit 0ab8f15f3e
1 changed files with 26 additions and 21 deletions
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47
AsyncDisplayKit/TextKit/ASTextKitContext.mm
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@@ -18,19 +18,19 @@
{
// All TextKit operations (even non-mutative ones) must be executed serially.
std::shared_ptr<ASDN::Mutex> __instanceLock__;
NSLayoutManager *_layoutManager;
NSTextStorage *_textStorage;
NSTextContainer *_textContainer;
}
+ (nullable id)accessCacheWithBlock:(id _Nullable(^)(NSCache *))block
+ (nullable id)accessCacheWithBlock:(id(^)(NSMutableArray *))block
{
static NSLock *lock;
static dispatch_once_t onceToken;
static NSCache *contextCache;
static NSMutableArray *contextCache;
dispatch_once(&onceToken, ^{
contextCache = [[NSCache alloc] init];
contextCache = [[NSMutableArray alloc] init];
lock = [[NSLock alloc] init];
});
[lock lock];
@@ -46,16 +46,18 @@
constrainedSize:(CGSize)constrainedSize
layoutManagerDelegate:(id<NSLayoutManagerDelegate>)layoutManagerDelegate
{
ASTextKitContext * _Nullable cached = [self accessCacheWithBlock:^(NSCache *cache) {
id key = attributedString ?: (id)kCFNull;
ASTextKitContext *cached = [cache objectForKey:key];
if (cached != nil) {
[cache removeObjectForKey:key];
ASTextKitContext * _Nullable cached = [self accessCacheWithBlock:^id(NSMutableArray *cache) {
NSInteger count = cache.count;
if (count == 0) {
return nil;
}
return cached;
NSInteger idx = count - 1;
ASTextKitContext *result = cache[idx];
[cache removeObjectAtIndex:idx];
return result;
}];
if (cached != nil) {
[cached configureWithLineBreakMode:lineBreakMode maximumNumberOfLines:maximumNumberOfLines exclusionPaths:exclusionPaths constrainedSize:constrainedSize layoutManagerDelegate:layoutManagerDelegate];
[cached configureWithAttributedString:attributedString lineBreakMode:lineBreakMode maximumNumberOfLines:maximumNumberOfLines exclusionPaths:exclusionPaths constrainedSize:constrainedSize layoutManagerDelegate:layoutManagerDelegate];
return cached;
} else {
return [[ASTextKitContext alloc] initWithAttributedString:attributedString lineBreakMode:lineBreakMode maximumNumberOfLines:maximumNumberOfLines exclusionPaths:exclusionPaths constrainedSize:constrainedSize layoutManagerDelegate:layoutManagerDelegate];
@@ -78,23 +80,27 @@
__instanceLock__ = std::make_shared<ASDN::Mutex>();
// Create the TextKit component stack with our default configuration.
_textStorage = (attributedString ? [[NSTextStorage alloc] initWithAttributedString:attributedString] : [[NSTextStorage alloc] init]);
_textStorage = [[NSTextStorage alloc] init];
_layoutManager = [[ASLayoutManager alloc] init];
[_textStorage addLayoutManager:_layoutManager];
_textContainer = [[NSTextContainer alloc] initWithSize:constrainedSize];
[_layoutManager addTextContainer:_textContainer];
[self configureWithLineBreakMode:lineBreakMode maximumNumberOfLines:maximumNumberOfLines exclusionPaths:exclusionPaths constrainedSize:constrainedSize layoutManagerDelegate:layoutManagerDelegate];
[self configureWithAttributedString:attributedString lineBreakMode:lineBreakMode maximumNumberOfLines:maximumNumberOfLines exclusionPaths:exclusionPaths constrainedSize:constrainedSize layoutManagerDelegate:layoutManagerDelegate];
}
return self;
}
- (void)configureWithLineBreakMode:(NSLineBreakMode)lineBreakMode
maximumNumberOfLines:(NSUInteger)maximumNumberOfLines
exclusionPaths:(NSArray *)exclusionPaths
constrainedSize:(CGSize)constrainedSize
layoutManagerDelegate:(id<NSLayoutManagerDelegate>)layoutManagerDelegate
- (void)configureWithAttributedString:(NSAttributedString *)attributedString
lineBreakMode:(NSLineBreakMode)lineBreakMode
maximumNumberOfLines:(NSUInteger)maximumNumberOfLines
exclusionPaths:(NSArray *)exclusionPaths
constrainedSize:(CGSize)constrainedSize
layoutManagerDelegate:(id<NSLayoutManagerDelegate>)layoutManagerDelegate
{
if ([_textStorage isEqualToAttributedString:attributedString] == NO) {
[_textStorage setAttributedString:attributedString];
}
_layoutManager.usesFontLeading = NO;
_layoutManager.delegate = layoutManagerDelegate;
// We want the text laid out up to the very edges of the container.
@@ -109,9 +115,8 @@
- (void)markForReuse
{
id key = _textStorage.length > 0 ? [[NSAttributedString alloc] initWithAttributedString:_textStorage] : (id)kCFNull;
[ASTextKitContext accessCacheWithBlock:^id _Nullable(NSCache *cache) {
[cache setObject:self forKey:key];
[ASTextKitContext accessCacheWithBlock:^id(NSMutableArray *cache) {
[cache addObject:self];
return nil;
}];
}