105 lines
3.8 KiB
Mathematica
105 lines
3.8 KiB
Mathematica
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// Copyright 2018-present 650 Industries. All rights reserved.
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#import <UMReactNativeAdapter/UMReactFontManager.h>
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#import <ExpoModulesCore/EXFontProcessorInterface.h>
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#import <ExpoModulesCore/EXFontManagerInterface.h>
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#import <React/RCTFont.h>
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#import <UMCore/UMAppLifecycleService.h>
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#import <objc/runtime.h>
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static dispatch_once_t initializeCurrentFontProcessorsOnce;
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static NSPointerArray *currentFontProcessors;
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@implementation RCTFont (UMReactFontManager)
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+ (UIFont *)UMUpdateFont:(UIFont *)uiFont
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withFamily:(NSString *)family
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size:(NSNumber *)size
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weight:(NSString *)weight
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style:(NSString *)style
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variant:(NSArray<NSDictionary *> *)variant
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scaleMultiplier:(CGFloat)scaleMultiplier
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{
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UIFont *font;
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for (id<EXFontProcessorInterface> fontProcessor in currentFontProcessors) {
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font = [fontProcessor updateFont:uiFont withFamily:family size:size weight:weight style:style variant:variant scaleMultiplier:scaleMultiplier];
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if (font) {
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return font;
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}
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}
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return [self UMUpdateFont:uiFont withFamily:family size:size weight:weight style:style variant:variant scaleMultiplier:scaleMultiplier];
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}
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@end
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/**
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* This class is responsible for allowing other modules to register as font processors in React Native.
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*
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* A font processor is an object conforming to UMFontProcessorInterface and is capable of
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* providing an instance of UIFont for given (family, size, weight, style, variant, scaleMultiplier).
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*
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* To be able to hook into React Native's way of processing fonts we:
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* - add a new class method to RCTFont, `UMUpdateFont:withFamily:size:weight:style:variant:scaleMultiplier`
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* with UMReactFontManager category.
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* - add a new static variable `currentFontProcessors` holding an array of... font processors. This variable
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* is shared between the RCTFont's category and UMReactFontManager class.
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* - when UMReactFontManager is initialized, we exchange implementations of RCTFont.updateFont...
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* and RCTFont.UMUpdateFont... After the class initialized, which happens only once, calling `RCTFont updateFont`
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* calls in fact implementation we've defined up here and calling `RCTFont UMUpdateFont` falls back
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* to the default implementation. (This is why we call `[self UMUpdateFont]` at the end of that function,
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* though it seems like an endless loop, in fact we dispatch to another implementation.)
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* - When some module adds a font processor using UMFontManagerInterface, UMReactFontManager adds a weak pointer to it
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* to currentFontProcessors array.
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* - Implementation logic of `RCTFont.UMUpdateFont` uses current value of currentFontProcessors when processing arguments.
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*/
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@interface UMReactFontManager ()
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@property (nonatomic, strong) NSMutableSet *fontProcessors;
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@end
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@implementation UMReactFontManager
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UM_REGISTER_MODULE();
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- (instancetype)init
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{
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if (self = [super init]) {
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_fontProcessors = [NSMutableSet set];
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}
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return self;
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}
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+ (const NSArray<Protocol *> *)exportedInterfaces
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{
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return @[@protocol(EXFontManagerInterface)];
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}
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+ (void)initialize
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{
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dispatch_once(&initializeCurrentFontProcessorsOnce, ^{
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currentFontProcessors = [NSPointerArray weakObjectsPointerArray];
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});
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Class rtcClass = [RCTFont class];
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SEL rtcUpdate = @selector(updateFont:withFamily:size:weight:style:variant:scaleMultiplier:);
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SEL exUpdate = @selector(UMUpdateFont:withFamily:size:weight:style:variant:scaleMultiplier:);
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method_exchangeImplementations(class_getClassMethod(rtcClass, rtcUpdate),
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class_getClassMethod(rtcClass, exUpdate));
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}
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# pragma mark - UMFontManager
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- (void)addFontProcessor:(id<EXFontProcessorInterface>)processor
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{
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[_fontProcessors addObject:processor];
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[currentFontProcessors compact];
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[currentFontProcessors addPointer:(__bridge void * _Nullable)(processor)];
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}
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@end
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