Added 'bottomTabPressed' navigation event (#955)

* Added an additional navigation event for the press of an already selected tab

* Renamed new navigation event to bottomTabReselected

android/app/src/main/java/com/reactnativenavigation/layouts/BottomTabsLayout.java

     @Override
     public boolean onTabSelected(int position, boolean wasSelected) {
         if (wasSelected) {
+            sendTabReselectedEventToJs();
             return false;
         }
         
         NavigationApplication.instance.getEventEmitter().sendNavigatorEvent("bottomTabSelected", navigatorEventId, data);
     }
 
+    private void sendTabReselectedEventToJs() {
+        WritableMap data = Arguments.createMap();
+        String navigatorEventId = getCurrentScreenStack().peek().getNavigatorEventId();
+        NavigationApplication.instance.getEventEmitter().sendNavigatorEvent("bottomTabReselected", navigatorEventId, data);
+    }
+
     private void showNewStack(int position) {
         showStackAndUpdateStyle(screenStacks[position]);
         currentStackIndex = position;

ios/RCCTabBarController.m

   
   if (tabBarController.selectedIndex != [tabBarController.viewControllers indexOfObject:viewController]) {
     [RCCTabBarController sendScreenTabChangedEvent:viewController];
+  } else {
+    [RCCTabBarController sendScreenTabPressedEvent:viewController];
   }
 
   return YES;
 }
 
 +(void)sendScreenTabChangedEvent:(UIViewController*)viewController {
+  [RCCTabBarController sendTabEvent:@"bottomTabSelected" controller:viewController];
+}
+
++(void)sendScreenTabPressedEvent:(UIViewController*)viewController {
+  [RCCTabBarController sendTabEvent:@"bottomTabReselected" controller:viewController];
+}
+
++(void)sendTabEvent:(NSString *)event controller:(UIViewController*)viewController {
   if ([viewController.view isKindOfClass:[RCTRootView class]]){
     RCTRootView *rootView = (RCTRootView *)viewController.view;
     
       
       [[[RCCManager sharedInstance] getBridge].eventDispatcher sendAppEventWithName:rootView.appProperties[@"navigatorEventID"] body:@
        {
-         @"id": @"bottomTabSelected",
+         @"id": event,
          @"navigatorID": navigatorID,
          @"screenInstanceID": screenInstanceID
        }];
   if ([viewController isKindOfClass:[UINavigationController class]]) {
     UINavigationController *navigationController = (UINavigationController*)viewController;
     UIViewController *topViewController = [navigationController topViewController];
-    [RCCTabBarController sendScreenTabChangedEvent:topViewController];
+    [RCCTabBarController sendTabEvent:event controller:topViewController];
   }
 }
 
-
 @end