fix(tabs): fire leaving life cycle events

Closes #2869

js/angular/directive/tabs.js

@@ -82,6 +82,18 @@ function($ionicTabsDelegate, $ionicConfig, $ionicHistory) {
           $scope.$hasTabsTop = isTabsTop && !isHidden;
         });
 
+        function emitLifecycleEvent(ev, data) {
+          ev.stopPropagation();
+          var selectedTab = tabsCtrl.selectedTab();
+          if (selectedTab) {
+            selectedTab.$emit(ev.name.replace('NavView', 'View'), data);
+          }
+        }
+
+        $scope.$on('$ionicNavView.beforeLeave', emitLifecycleEvent);
+        $scope.$on('$ionicNavView.afterLeave', emitLifecycleEvent);
+        $scope.$on('$ionicNavView.leave', emitLifecycleEvent);
+
         $scope.$on('$destroy', function() {
           // variable to inform child tabs that they're all being blown away
           // used so that while destorying an individual tab, each one

js/angular/service/viewSwitcher.js

@@ -315,6 +315,12 @@ function($timeout, $document, $q, $ionicClickBlock, $ionicConfig, $ionicNavBarDe
                 scope.$emit('$ionicView.leave', leavingData);
               }
             }
+
+          } else if (scope && leavingData && leavingData.viewId) {
+            scope.$emit('$ionicNavView.' + step + 'Leave', leavingData);
+            if (step == 'after') {
+              scope.$emit('$ionicNavView.leave', leavingData);
+            }
           }
         },
 

test/unit/angular/directive/navView.unit.js

@@ -920,6 +920,96 @@ describe('Ionic nav-view', function() {
     expect(leave.transitionId).toEqual(4);
   }));
 
+  it('should emit tab leaving events', inject(function ($state, $q, $timeout, $compile, $ionicConfig) {
+    var beforeLeave, afterLeave, leave;
+    scope.$on('$ionicView.beforeLeave', function(ev, d){
+      beforeLeave = d;
+    });
+    scope.$on('$ionicView.afterLeave', function(ev, d){
+      afterLeave = d;
+    });
+    scope.$on('$ionicView.leave', function(ev, d){
+      leave = d;
+    });
+
+    elem.append($compile('<ion-nav-view name="root"></ion-nav-view>')(scope));
+
+    $state.go(tab1page1State);
+    $q.flush();
+    $timeout.flush();
+
+    $state.go(tab1page2State);
+    $q.flush();
+    $timeout.flush();
+
+    expect(beforeLeave.stateName).toEqual('tabAbstract.tab1page1');
+    expect(afterLeave.stateName).toEqual('tabAbstract.tab1page1');
+    expect(leave.stateName).toEqual('tabAbstract.tab1page1');
+
+    $state.go(tab2page1State);
+    $q.flush();
+    $timeout.flush();
+
+    expect(beforeLeave.stateName).toEqual('tabAbstract.tab1page2');
+    expect(afterLeave.stateName).toEqual('tabAbstract.tab1page2');
+    expect(leave.stateName).toEqual('tabAbstract.tab1page2');
+
+    $state.go(tab3page1State);
+    $q.flush();
+    $timeout.flush();
+
+    expect(beforeLeave.stateName).toEqual('tabAbstract.tab2page1');
+    expect(afterLeave.stateName).toEqual('tabAbstract.tab2page1');
+    expect(leave.stateName).toEqual('tabAbstract.tab2page1');
+
+    $state.go(tab1page1State);
+    $q.flush();
+    $timeout.flush();
+
+    expect(beforeLeave.stateName).toEqual('tabAbstract.tab3page1');
+    expect(afterLeave.stateName).toEqual('tabAbstract.tab3page1');
+    expect(leave.stateName).toEqual('tabAbstract.tab3page1');
+  }));
+
+  it('should emit tab $ionicView.unloaded event', inject(function ($state, $q, $timeout, $compile, $ionicConfig) {
+    $ionicConfig.views.maxCache(0);
+
+    var unloadedEvent;
+    scope.$on('$ionicView.unloaded', function(ev, d){
+      unloadedEvent = d;
+    });
+
+    elem.append($compile('<ion-nav-view name="root"></ion-nav-view>')(scope));
+
+    $state.go(tab1page1State);
+    $q.flush();
+    $timeout.flush();
+
+    $state.go(tab1page2State);
+    $q.flush();
+    $timeout.flush();
+
+    expect(unloadedEvent.stateName).toEqual('tabAbstract.tab1page1');
+
+    $state.go(tab2page1State);
+    $q.flush();
+    $timeout.flush();
+
+    expect(unloadedEvent.stateName).toEqual('tabAbstract.tab1page2');
+
+    $state.go(tab3page1State);
+    $q.flush();
+    $timeout.flush();
+
+    expect(unloadedEvent.stateName).toEqual('tabAbstract.tab2page1');
+
+    $state.go(tab1page1State);
+    $q.flush();
+    $timeout.flush();
+
+    expect(unloadedEvent.stateName).toEqual('tabAbstract.tab3page1');
+  }));
+
   it('should clear ion-nav-view cache', inject(function ($state, $q, $timeout, $compile, $ionicHistory) {
     elem.append($compile('<div><ion-nav-view></ion-nav-view></div>')(scope));