1 files changed, 67 insertions, 0 deletions
diff --git a/src/service/invalidWidgets.js b/src/service/invalidWidgets.js
new file mode 100644
index 00000000..af31d61d
--- /dev/null
+++ b/src/service/invalidWidgets.js
@@ -0,0 +1,67 @@
+/**
+ * @workInProgress
+ * @ngdoc service
+ * @name angular.service.$invalidWidgets
+ *
+ * @description
+ * Keeps references to all invalid widgets found during validation.
+ * Can be queried to find whether there are any invalid widgets currently displayed.
+ *
+ * @example
+ */
+angularServiceInject("$invalidWidgets", function(){
+  var invalidWidgets = [];
+
+
+  /** Remove an element from the array of invalid widgets */
+  invalidWidgets.markValid = function(element){
+    var index = indexOf(invalidWidgets, element);
+    if (index != -1)
+      invalidWidgets.splice(index, 1);
+  };
+
+
+  /** Add an element to the array of invalid widgets */
+  invalidWidgets.markInvalid = function(element){
+    var index = indexOf(invalidWidgets, element);
+    if (index === -1)
+      invalidWidgets.push(element);
+  };
+
+
+  /** Return count of all invalid widgets that are currently visible */
+  invalidWidgets.visible = function() {
+    var count = 0;
+    forEach(invalidWidgets, function(widget){
+      count = count + (isVisible(widget) ? 1 : 0);
+    });
+    return count;
+  };
+
+
+  /* At the end of each eval removes all invalid widgets that are not part of the current DOM. */
+  this.$onEval(PRIORITY_LAST, function() {
+    for(var i = 0; i < invalidWidgets.length;) {
+      var widget = invalidWidgets[i];
+      if (isOrphan(widget[0])) {
+        invalidWidgets.splice(i, 1);
+        if (widget.dealoc) widget.dealoc();
+      } else {
+        i++;
+      }
+    }
+  });
+
+
+  /**
+   * Traverses DOM element's (widget's) parents and considers the element to be an orphant if one of
+   * it's parents isn't the current window.document.
+   */
+  function isOrphan(widget) {
+    if (widget == window.document) return false;
+    var parent = widget.parentNode;
+    return !parent || isOrphan(parent);
+  }
+
+  return invalidWidgets;
+}, [], true);