fix(tabs): correct tab leaving lifecycle events

Closes #2869

Author: adamdbradley

Diff for: js/angular/controller/navViewController.js

@@ -58,6 +58,10 @@ function($scope, $element, $attrs, $compile, $controller, $ionicNavBarDelegate,
     $scope.$on('$ionicTabs.top', onTabsTop);
     $scope.$on('$ionicSubheader', onBarSubheader);
 
+    $scope.$on('$ionicTabs.beforeLeave', onTabsLeave);
+    $scope.$on('$ionicTabs.afterLeave', onTabsLeave);
+    $scope.$on('$ionicTabs.leave', onTabsLeave);
+
     ionic.Platform.ready(function() {
       if (ionic.Platform.isWebView() && $ionicConfig.views.swipeBackEnabled()) {
         self.initSwipeBack();
@@ -193,6 +197,21 @@ function($scope, $element, $attrs, $compile, $controller, $ionicNavBarDelegate,
   };
 
 
+  function onTabsLeave(ev, data) {
+    var viewElements = $element.children();
+    var viewElement, viewScope;
+
+    for (var x = 0, l = viewElements.length; x < l; x++) {
+      viewElement = viewElements.eq(x);
+      if (navViewAttr(viewElement) == VIEW_STATUS_ACTIVE) {
+        viewScope = viewElement.scope();
+        viewScope && viewScope.$emit(ev.name.replace('Tabs', 'View'), data);
+        break;
+      }
+    }
+  }
+
+
   self.cacheCleanup = function() {
     var viewElements = $element.children();
     for (var x = 0, l = viewElements.length; x < l; x++) {
@@ -216,7 +235,6 @@ function($scope, $element, $attrs, $compile, $controller, $ionicNavBarDelegate,
         viewScope && viewScope.$broadcast('$ionicView.clearCache');
       }
     }
-
   };
 
 

Diff for: js/angular/controller/tabsController.js

@@ -6,6 +6,7 @@ IonicModule
 function($scope, $element, $ionicHistory) {
   var self = this;
   var selectedTab = null;
+  var previousSelectedTab = null;
   var selectedTabIndex;
   self.tabs = [];
 
@@ -15,6 +16,9 @@ function($scope, $element, $ionicHistory) {
   self.selectedTab = function() {
     return selectedTab;
   };
+  self.previousSelectedTab = function() {
+    return previousSelectedTab;
+  };
 
   self.add = function(tab) {
     $ionicHistory.registerHistory(tab);
@@ -43,6 +47,7 @@ function($scope, $element, $ionicHistory) {
 
   self.deselect = function(tab) {
     if (tab.$tabSelected) {
+      previousSelectedTab = selectedTab;
       selectedTab = selectedTabIndex = null;
       tab.$tabSelected = false;
       (tab.onDeselect || noop)();

Diff for: js/angular/directive/tabs.js

@@ -85,9 +85,9 @@ function($ionicTabsDelegate, $ionicConfig, $ionicHistory) {
 
         function emitLifecycleEvent(ev, data) {
           ev.stopPropagation();
-          var selectedTab = tabsCtrl.selectedTab();
-          if (selectedTab) {
-            selectedTab.$emit(ev.name.replace('NavView', 'View'), data);
+          var previousSelectedTab = tabsCtrl.previousSelectedTab();
+          if (previousSelectedTab) {
+            previousSelectedTab.$broadcast(ev.name.replace('NavView', 'Tabs'), data);
           }
         }