prevent from publishing dimensions change event when app changes state

React/Base/RCTUtils.h

@@ -186,4 +186,6 @@ RCT_EXTERN BOOL RCTValidateTypeOfViewCommandArgument(
  NSString const *commandName,
  NSString const *argPos);
 
+RCT_EXTERN BOOL RCTIsAppActive(void);
+
 NS_ASSUME_NONNULL_END

React/Base/RCTUtils.m

@@ -1067,3 +1067,8 @@ RCT_EXTERN BOOL RCTValidateTypeOfViewCommandArgument(
 
  return true;
 }
+
+BOOL RCTIsAppActive(void)
+{
+ return [RCTSharedApplication() applicationState] == UIApplicationStateActive;
+}

React/CoreModules/RCTDeviceInfo.mm

@@ -26,6 +26,7 @@ @interface RCTDeviceInfo () <NativeDeviceInfoSpec, RCTInitializing>
 @implementation RCTDeviceInfo {
  UIInterfaceOrientation _currentInterfaceOrientation;
  NSDictionary *_currentInterfaceDimensions;
+ BOOL _isFullscreen;
 }
 
 @synthesize bridge = _bridge;
@@ -60,7 +61,7 @@ - (void)initialize
  _currentInterfaceDimensions = RCTExportedDimensions(_moduleRegistry, _bridge);
 
  [[NSNotificationCenter defaultCenter] addObserver:self
- selector:@selector(interfaceFrameDidChange)
+ selector:@selector(interfaceOrientationDidChange)
  name:UIApplicationDidBecomeActiveNotification
  object:nil];
 
@@ -173,22 +174,35 @@ - (void)interfaceOrientationDidChange
 
 - (void)_interfaceOrientationDidChange
 {
- UIInterfaceOrientation nextOrientation = [RCTSharedApplication() statusBarOrientation];
+ UIApplication *application = RCTSharedApplication();
+ UIInterfaceOrientation nextOrientation = [application statusBarOrientation];
+
+ BOOL isRunningInFullScreen = 
+ CGRectEqualToRect(application.delegate.window.frame, application.delegate.window.screen.bounds);
+ // We are catching here two situations for multitasking view:
+ // a) The app is in Split View and the container gets resized -> !isRunningInFullScreen
+ // b) The app changes to/from fullscreen example: App runs in slide over mode and goes into fullscreen-> isRunningInFullScreen != _isFullscreen
+ // The above two cases a || b can be shortened to !isRunningInFullScreen || !_isFullscreen;
+ BOOL isResizingOrChangingToFullscreen = !isRunningInFullScreen || !_isFullscreen;
+ BOOL isOrientationChanging = (UIInterfaceOrientationIsPortrait(_currentInterfaceOrientation) &&
+ !UIInterfaceOrientationIsPortrait(nextOrientation)) || (UIInterfaceOrientationIsLandscape(_currentInterfaceOrientation) &&
+ !UIInterfaceOrientationIsLandscape(nextOrientation));
 
  // Update when we go from portrait to landscape, or landscape to portrait
- if ((UIInterfaceOrientationIsPortrait(_currentInterfaceOrientation) &&
- !UIInterfaceOrientationIsPortrait(nextOrientation)) ||
- (UIInterfaceOrientationIsLandscape(_currentInterfaceOrientation) &&
- !UIInterfaceOrientationIsLandscape(nextOrientation))) {
+ // Also update when the fullscreen state changes (multitasking) and only when the app is in active state.
+ if ((isOrientationChanging || isResizingOrChangingToFullscreen) && RCTIsAppActive()) {
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wdeprecated-declarations"
- [[_moduleRegistry moduleForName:"EventDispatcher"]
- sendDeviceEventWithName:@"didUpdateDimensions"
- body:RCTExportedDimensions(_moduleRegistry, _bridge)];
+ [[_moduleRegistry moduleForName:"EventDispatcher"] sendDeviceEventWithName:@"didUpdateDimensions"
+ body:RCTExportedDimensions(_moduleRegistry, _bridge)];
+ // We only want to track the current _currentInterfaceOrientation and _isFullscreen only
+ // when it happens and only when it is published.
+ _currentInterfaceOrientation = nextOrientation;
+ _isFullscreen = isRunningInFullScreen;
 #pragma clang diagnostic pop
  }
 
- _currentInterfaceOrientation = nextOrientation;
+
 }
 
 - (void)interfaceFrameDidChange
@@ -202,16 +216,19 @@ - (void)interfaceFrameDidChange
 - (void)_interfaceFrameDidChange
 {
  NSDictionary *nextInterfaceDimensions = RCTExportedDimensions(_moduleRegistry, _bridge);
-
- if (!([nextInterfaceDimensions isEqual:_currentInterfaceDimensions])) {
+
+ // update and publish the even only when the app is in active state
+ if (!([nextInterfaceDimensions isEqual:_currentInterfaceDimensions]) && RCTIsAppActive()) {
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wdeprecated-declarations"
- [[_moduleRegistry moduleForName:"EventDispatcher"] sendDeviceEventWithName:@"didUpdateDimensions"
- body:nextInterfaceDimensions];
+ [[_moduleRegistry moduleForName:"EventDispatcher"]
+ sendDeviceEventWithName:@"didUpdateDimensions"
+ body:nextInterfaceDimensions];
+ // We only want to track the current _currentInterfaceOrientation only
+ // when it happens and only when it is published.
+ _currentInterfaceDimensions = nextInterfaceDimensions;
 #pragma clang diagnostic pop
  }
-
- _currentInterfaceDimensions = nextInterfaceDimensions;
 }
 
 - (std::shared_ptr<TurboModule>)getTurboModule:(const ObjCTurboModule::InitParams &)params