fix(positioning): wait for animation to complete

When calculating the dropdown position the height of the dropdown
needs to be known. When using ngAnimate the animation has not
finished by the time the height calculation is needed. This fix
extracts the positioning calculation out to a function that is
called after animation is done (or immediately when animation is
not in use).

Fixes #1593.

src/uiSelectDirective.js

@@ -323,57 +323,69 @@ uis.directive('uiSelect',
 
         };
 
-        scope.calculateDropdownPos = function(){
+        var calculateDropdownPosAfterAnimation = function() {
+          // Delay positioning the dropdown until all choices have been added so its height is correct.
+          $timeout(function() {
+            if ($select.dropdownPosition === 'up') {
+              //Go UP
+              setDropdownPosUp();
+            } else {
+              //AUTO
+              element.removeClass(directionUpClassName);
+
+              var offset = uisOffset(element);
+              var offsetDropdown = uisOffset(dropdown);
+
+              //https://code.google.com/p/chromium/issues/detail?id=342307#c4
+              var scrollTop = $document[0].documentElement.scrollTop || $document[0].body.scrollTop; //To make it cross browser (blink, webkit, IE, Firefox).
+
+              // Determine if the direction of the dropdown needs to be changed.
+              if (offset.top + offset.height + offsetDropdown.height > scrollTop + $document[0].documentElement.clientHeight) {
+                //Go UP
+                setDropdownPosUp(offset, offsetDropdown);
+              }else{
+                //Go DOWN
+                setDropdownPosDown(offset, offsetDropdown);
+              }
+            }
 
+            // Display the dropdown once it has been positioned.
+            dropdown[0].style.opacity = 1;
+          });
+        };
+
+        scope.calculateDropdownPos = function() {
           if ($select.open) {
             dropdown = angular.element(element).querySelectorAll('.ui-select-dropdown');
+
             if (dropdown.length === 0) {
               return;
             }
 
             // Hide the dropdown so there is no flicker until $timeout is done executing.
             dropdown[0].style.opacity = 0;
 
-            // Delay positioning the dropdown until all choices have been added so its height is correct.
-            $timeout(function(){
-
-              if ($select.dropdownPosition === 'up'){
-                  //Go UP
-                  setDropdownPosUp();
-
-              }else{ //AUTO
+            if (!uisOffset(dropdown).height && $select.$animate && $select.$animate.on && $select.$animate.enabled(dropdown)) {
+              var needsCalculated = true;
 
-                element.removeClass(directionUpClassName);
-
-                var offset = uisOffset(element);
-                var offsetDropdown = uisOffset(dropdown);
-
-                //https://code.google.com/p/chromium/issues/detail?id=342307#c4
-                var scrollTop = $document[0].documentElement.scrollTop || $document[0].body.scrollTop; //To make it cross browser (blink, webkit, IE, Firefox).
-
-                // Determine if the direction of the dropdown needs to be changed.
-                if (offset.top + offset.height + offsetDropdown.height > scrollTop + $document[0].documentElement.clientHeight) {
-                  //Go UP
-                  setDropdownPosUp(offset, offsetDropdown);
-                }else{
-                  //Go DOWN
-                  setDropdownPosDown(offset, offsetDropdown);
+              $select.$animate.on('enter', dropdown, function (elem, phase) {
+                if (phase === 'close' && needsCalculated) {
+                  calculateDropdownPosAfterAnimation();
+                  needsCalculated = false;
                 }
-
-              }
-
-              // Display the dropdown once it has been positioned.
-              dropdown[0].style.opacity = 1;
-            });
+              });
+            } else {
+              calculateDropdownPosAfterAnimation();
+            }
           } else {
-              if (dropdown === null || dropdown.length === 0) {
-                return;
-              }
+            if (dropdown === null || dropdown.length === 0) {
+              return;
+            }
 
-              // Reset the position of the dropdown.
-              dropdown[0].style.position = '';
-              dropdown[0].style.top = '';
-              element.removeClass(directionUpClassName);
+            // Reset the position of the dropdown.
+            dropdown[0].style.position = '';
+            dropdown[0].style.top = '';
+            element.removeClass(directionUpClassName);
           }
         };
       };