Inheritance diagram for FlutterKeyCallbackGuard:

Instance Methods
(nonnull instancetype)	- initWithCallback:

(void)	- pendTo:withId:

(void)	- resolveTo:

Properties
BOOL	handled

BOOL	sentAnyEvents

NSString *	debugHandleSource

Detailed Description

Guards a |FlutterAsyncKeyCallback| to make sure it's handled exactly once throughout |FlutterEmbedderKeyResponder.handleEvent|.

A callback can either be handled with |pendTo:withId:|, or with |resolveTo:|. Either way, the callback cannot be handled again, or an assertion will be thrown.

Definition at line 266 of file FlutterEmbedderKeyResponder.mm.

Method Documentation

◆ initWithCallback:

- (nonnull instancetype) initWithCallback: (FlutterAsyncKeyCallback) callback

Initial value:

{
  
  FlutterAsyncKeyCallback _callback

Definition at line 296 of file FlutterEmbedderKeyResponder.mm.

                                         :(FlutterAsyncKeyCallback)callback {
   self = [super init];
   if (self != nil) {
     _callback = callback;
     _handled = FALSE;
     _sentAnyEvents = FALSE;
   }
   return self;
 }

◆ pendTo:withId:

- (void) pendTo:	(nonnull NSMutableDictionary<NSNumber, FlutterAsyncKeyCallback>)	pendingResponses
withId:	(uint64_t)	responseId

Handle the callback by storing it to pending responses.

Definition at line 306 of file FlutterEmbedderKeyResponder.mm.

               :(nonnull NSMutableDictionary<NSNumber*, FlutterAsyncKeyCallback>*)pendingResponses
         withId:(uint64_t)responseId {
   NSAssert(!_handled, @"This callback has been handled by %@.", _debugHandleSource);
   if (_handled) {
     return;
   }
   pendingResponses[@(responseId)] = _callback;
   _handled = TRUE;
   NSAssert(
       ((_debugHandleSource = [NSString stringWithFormat:@"pending event %llu", responseId]), TRUE),
       @"");
 }

◆ resolveTo:

- (void) resolveTo: (BOOL) handled

Handle the callback by calling it with a result.

Definition at line 319 of file FlutterEmbedderKeyResponder.mm.

                  :(BOOL)handled {
   NSAssert(!_handled, @"This callback has been handled by %@.", _debugHandleSource);
   if (_handled) {
     return;
   }
   _callback(handled);
   _handled = TRUE;
   NSAssert(((_debugHandleSource = [NSString stringWithFormat:@"resolved with %d", _handled]), TRUE),
            @"");
 }

Property Documentation

◆ debugHandleSource

- (NSString*) debugHandleSource

readwritenonatomiccopy

A string indicating how the callback is handled.

Only set in debug mode. Nil in release mode, or if the callback has not been handled.

Definition at line 288 of file FlutterEmbedderKeyResponder.mm.

◆ handled

- (BOOL) handled

readwritenonatomicassign

Definition at line 280 of file FlutterEmbedderKeyResponder.mm.

◆ sentAnyEvents

- (BOOL) sentAnyEvents