fix($animate): allow enabled children to animate on disabled parents

Prior to this fix if a parent container disabled animations for
itself then no children could be enabled explicity via
`$animate.enabled`. This patch allows for that to work.

Closes angular#13179
Closes angular#13695

Author: matsko

src/ngAnimate/animateQueue.js

@@ -256,12 +256,7 @@ var $$AnimateQueueProvider = ['$animateProvider', function($animateProvider) {
               bool = !recordExists;
             } else {
               // (element, bool) - Element setter
-              bool = !!bool;
-              if (!bool) {
-                disabledElementsLookup.put(node, true);
-              } else if (recordExists) {
-                disabledElementsLookup.remove(node);
-              }
+              disabledElementsLookup.put(node, !bool);
             }
           }
         }
@@ -574,6 +569,17 @@ var $$AnimateQueueProvider = ['$animateProvider', function($animateProvider) {
       var parentAnimationDetected = false;
       var animateChildren;
 
+      var PARENT_STATE_DISABLED = 1;
+      var PARENT_STATE_ENABLED = 2;
+      var parentElementDisabledState = 0;
+
+      var elementDisabledStatus = disabledElementsLookup.get(getDomNode(element));
+      if (elementDisabledStatus === true) {
+        parentElementDisabledState = PARENT_STATE_DISABLED;
+      } else if (elementDisabledStatus === false) {
+        parentElementDisabledState = PARENT_STATE_ENABLED;
+      }
+
       var parentHost = element.data(NG_ANIMATE_PIN_DATA);
       if (parentHost) {
         parentElement = parentHost;
@@ -597,7 +603,15 @@ var $$AnimateQueueProvider = ['$animateProvider', function($animateProvider) {
         // therefore we can't allow any animations to take place
         // but if a parent animation is class-based then that's ok
         if (!parentAnimationDetected) {
-          parentAnimationDetected = details.structural || disabledElementsLookup.get(parentNode);
+          var disabledStatus = disabledElementsLookup.get(parentNode);
+
+          // the user has `explicitly` allowed for animations to be enabled on this container
+          if (disabledStatus === true && parentElementDisabledState != PARENT_STATE_ENABLED) {
+            parentElementDisabledState = PARENT_STATE_DISABLED;
+          } else if (disabledStatus === false) {
+            parentElementDisabledState = PARENT_STATE_ENABLED;
+          }
+          parentAnimationDetected = details.structural;
         }
 
         if (isUndefined(animateChildren) || animateChildren === true) {
@@ -632,7 +646,7 @@ var $$AnimateQueueProvider = ['$animateProvider', function($animateProvider) {
         parentElement = parentElement.parent();
       }
 
-      var allowAnimation = !parentAnimationDetected || animateChildren;
+      var allowAnimation = (!parentAnimationDetected || animateChildren) && parentElementDisabledState != PARENT_STATE_DISABLED;
       return allowAnimation && rootElementDetected && bodyElementDetected;
     }
 

test/ngAnimate/animateSpec.js

@@ -304,6 +304,35 @@ describe("animations", function() {
         $rootScope.$digest();
         expect(capturedAnimation).toBeTruthy();
       }));
+
+      iit('should enable animations on the child element if explicitly allowed even if animations are disabled on the parent',
+        inject(function($animate, $rootScope) {
+
+        var child = jqLite('<div></div>');
+        element.append(child);
+        parent.append(element);
+
+        $animate.enabled(parent, false);
+
+        $animate.addClass(element, 'red');
+        $rootScope.$digest();
+        expect(capturedAnimation).toBeFalsy();
+
+        $animate.addClass(child, 'red');
+        $rootScope.$digest();
+        expect(capturedAnimation).toBeFalsy();
+
+        $animate.enabled(element, true);
+
+        $animate.addClass(element, 'blue');
+        $rootScope.$digest();
+        expect(capturedAnimation).toBeTruthy();
+        capturedAnimation = null;
+
+        $animate.addClass(child, 'blue');
+        $rootScope.$digest();
+        expect(capturedAnimation).toBeTruthy();
+      }));
     });
 
     it('should strip all comment nodes from the animation and not issue an animation if not real elements are found',