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127 lines
3.4 KiB
Objective-C
127 lines
3.4 KiB
Objective-C
//
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// ASInternalHelpers.mm
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// AsyncDisplayKit
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//
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// Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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#import "ASInternalHelpers.h"
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#import <objc/runtime.h>
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#import "ASThread.h"
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#import <tgmath.h>
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BOOL ASSubclassOverridesSelector(Class superclass, Class subclass, SEL selector)
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{
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Method superclassMethod = class_getInstanceMethod(superclass, selector);
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Method subclassMethod = class_getInstanceMethod(subclass, selector);
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IMP superclassIMP = superclassMethod ? method_getImplementation(superclassMethod) : NULL;
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IMP subclassIMP = subclassMethod ? method_getImplementation(subclassMethod) : NULL;
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return (superclassIMP != subclassIMP);
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}
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BOOL ASSubclassOverridesClassSelector(Class superclass, Class subclass, SEL selector)
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{
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Method superclassMethod = class_getClassMethod(superclass, selector);
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Method subclassMethod = class_getClassMethod(subclass, selector);
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IMP superclassIMP = superclassMethod ? method_getImplementation(superclassMethod) : NULL;
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IMP subclassIMP = subclassMethod ? method_getImplementation(subclassMethod) : NULL;
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return (superclassIMP != subclassIMP);
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}
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IMP ASReplaceMethodWithBlock(Class c, SEL origSEL, id block)
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{
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NSCParameterAssert(block);
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// Get original method
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Method origMethod = class_getInstanceMethod(c, origSEL);
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NSCParameterAssert(origMethod);
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// Convert block to IMP trampoline and replace method implementation
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IMP newIMP = imp_implementationWithBlock(block);
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// Try adding the method if not yet in the current class
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if (!class_addMethod(c, origSEL, newIMP, method_getTypeEncoding(origMethod))) {
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return method_setImplementation(origMethod, newIMP);
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} else {
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return method_getImplementation(origMethod);
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}
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}
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void ASPerformBlockOnMainThread(void (^block)())
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{
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if (block == nil){
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return;
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}
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if (ASDisplayNodeThreadIsMain()) {
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block();
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} else {
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dispatch_async(dispatch_get_main_queue(), block);
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}
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}
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void ASPerformBlockOnBackgroundThread(void (^block)())
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{
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if (block == nil){
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return;
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}
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if (ASDisplayNodeThreadIsMain()) {
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dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), block);
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} else {
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block();
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}
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}
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void ASPerformBlockOnDeallocationQueue(void (^block)())
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{
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static dispatch_queue_t queue;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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queue = dispatch_queue_create("org.AsyncDisplayKit.deallocationQueue", DISPATCH_QUEUE_SERIAL);
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});
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dispatch_async(queue, block);
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}
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CGFloat ASScreenScale()
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{
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static CGFloat __scale = 0.0;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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ASDisplayNodeCAssertMainThread();
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__scale = [[UIScreen mainScreen] scale];
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});
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return __scale;
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}
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CGFloat ASFloorPixelValue(CGFloat f)
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{
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CGFloat scale = ASScreenScale();
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return floor(f * scale) / scale;
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}
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CGFloat ASCeilPixelValue(CGFloat f)
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{
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CGFloat scale = ASScreenScale();
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return ceil(f * scale) / scale;
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}
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CGFloat ASRoundPixelValue(CGFloat f)
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{
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CGFloat scale = ASScreenScale();
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return round(f * scale) / scale;
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}
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@implementation NSIndexPath (ASInverseComparison)
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- (NSComparisonResult)asdk_inverseCompare:(NSIndexPath *)otherIndexPath
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{
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return [otherIndexPath compare:self];
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}
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@end
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