react-native/React/Base/RCTKeyCommands.m

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/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
#import "RCTKeyCommands.h"
#import <UIKit/UIKit.h>
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#import "RCTDefines.h"
#import "RCTUtils.h"
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#if RCT_DEV
static BOOL RCTIsIOS8OrEarlier()
{
return [UIDevice currentDevice].systemVersion.floatValue < 9;
}
@interface RCTKeyCommand : NSObject <NSCopying>
@property (nonatomic, strong) UIKeyCommand *keyCommand;
@property (nonatomic, copy) void (^block)(UIKeyCommand *);
@end
@implementation RCTKeyCommand
- (instancetype)initWithKeyCommand:(UIKeyCommand *)keyCommand
block:(void (^)(UIKeyCommand *))block
{
if ((self = [super init])) {
_keyCommand = keyCommand;
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_block = block;
}
return self;
}
RCT_NOT_IMPLEMENTED(- (instancetype)init)
- (id)copyWithZone:(__unused NSZone *)zone
{
return self;
}
- (NSUInteger)hash
{
return _keyCommand.input.hash ^ _keyCommand.modifierFlags;
}
- (BOOL)isEqual:(RCTKeyCommand *)object
{
if (![object isKindOfClass:[RCTKeyCommand class]]) {
return NO;
}
return [self matchesInput:object.keyCommand.input
flags:object.keyCommand.modifierFlags];
}
- (BOOL)matchesInput:(NSString *)input flags:(UIKeyModifierFlags)flags
{
return [_keyCommand.input isEqual:input] && _keyCommand.modifierFlags == flags;
}
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- (NSString *)description
{
return [NSString stringWithFormat:@"<%@:%p input=\"%@\" flags=%zd hasBlock=%@>",
[self class], self, _keyCommand.input, _keyCommand.modifierFlags,
_block ? @"YES" : @"NO"];
}
@end
@interface RCTKeyCommands ()
@property (nonatomic, strong) NSMutableSet<RCTKeyCommand *> *commands;
@end
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@implementation UIResponder (RCTKeyCommands)
- (NSArray<UIKeyCommand *> *)RCT_keyCommands
{
NSSet<RCTKeyCommand *> *commands = [RCTKeyCommands sharedInstance].commands;
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return [[commands valueForKeyPath:@"keyCommand"] allObjects];
}
- (void)RCT_handleKeyCommand:(UIKeyCommand *)key
{
// NOTE: throttle the key handler because on iOS 9 the handleKeyCommand:
// method gets called repeatedly if the command key is held down.
static NSTimeInterval lastCommand = 0;
if (RCTIsIOS8OrEarlier() || CACurrentMediaTime() - lastCommand > 0.5) {
for (RCTKeyCommand *command in [RCTKeyCommands sharedInstance].commands) {
if ([command.keyCommand.input isEqualToString:key.input] &&
command.keyCommand.modifierFlags == key.modifierFlags) {
if (command.block) {
command.block(key);
lastCommand = CACurrentMediaTime();
}
}
}
}
}
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@end
@implementation UIApplication (RCTKeyCommands)
// Required for iOS 8.x
- (BOOL)RCT_sendAction:(SEL)action to:(id)target from:(id)sender forEvent:(UIEvent *)event
{
if (action == @selector(RCT_handleKeyCommand:)) {
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[self RCT_handleKeyCommand:sender];
return YES;
}
return [self RCT_sendAction:action to:target from:sender forEvent:event];
}
@end
@implementation RCTKeyCommands
+ (void)initialize
{
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if (RCTIsIOS8OrEarlier()) {
//swizzle UIApplication
RCTSwapInstanceMethods([UIApplication class],
@selector(keyCommands),
@selector(RCT_keyCommands));
RCTSwapInstanceMethods([UIApplication class],
@selector(sendAction:to:from:forEvent:),
@selector(RCT_sendAction:to:from:forEvent:));
} else {
//swizzle UIResponder
RCTSwapInstanceMethods([UIResponder class],
@selector(keyCommands),
@selector(RCT_keyCommands));
}
}
+ (instancetype)sharedInstance
{
static RCTKeyCommands *sharedInstance;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
sharedInstance = [self new];
});
return sharedInstance;
}
- (instancetype)init
{
if ((self = [super init])) {
_commands = [NSMutableSet new];
}
return self;
}
- (void)registerKeyCommandWithInput:(NSString *)input
modifierFlags:(UIKeyModifierFlags)flags
action:(void (^)(UIKeyCommand *))block
{
RCTAssertMainThread();
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if (input.length && flags && RCTIsIOS8OrEarlier()) {
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// Workaround around the first cmd not working: http://openradar.appspot.com/19613391
// You can register just the cmd key and do nothing. This ensures that
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// command-key modified commands will work first time. Fixed in iOS 9.
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[self registerKeyCommandWithInput:@""
modifierFlags:flags
action:nil];
}
UIKeyCommand *command = [UIKeyCommand keyCommandWithInput:input
modifierFlags:flags
action:@selector(RCT_handleKeyCommand:)];
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RCTKeyCommand *keyCommand = [[RCTKeyCommand alloc] initWithKeyCommand:command block:block];
[_commands removeObject:keyCommand];
[_commands addObject:keyCommand];
}
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- (void)unregisterKeyCommandWithInput:(NSString *)input
modifierFlags:(UIKeyModifierFlags)flags
{
RCTAssertMainThread();
for (RCTKeyCommand *command in _commands.allObjects) {
if ([command matchesInput:input flags:flags]) {
[_commands removeObject:command];
break;
}
}
}
- (BOOL)isKeyCommandRegisteredForInput:(NSString *)input
modifierFlags:(UIKeyModifierFlags)flags
{
RCTAssertMainThread();
for (RCTKeyCommand *command in _commands) {
if ([command matchesInput:input flags:flags]) {
return YES;
}
}
return NO;
}
@end
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#else
@implementation RCTKeyCommands
+ (instancetype)sharedInstance
{
return nil;
}
- (void)registerKeyCommandWithInput:(NSString *)input
modifierFlags:(UIKeyModifierFlags)flags
action:(void (^)(UIKeyCommand *))block {}
- (void)unregisterKeyCommandWithInput:(NSString *)input
modifierFlags:(UIKeyModifierFlags)flags {}
- (BOOL)isKeyCommandRegisteredForInput:(NSString *)input
modifierFlags:(UIKeyModifierFlags)flags
{
return NO;
}
@end
#endif