Merge pull request #2548 from Polymer/effective-children

Effective children

src/lib/dom-api-classlist.html

@@ -0,0 +1,60 @@
+<!--
+@license
+Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+-->
+<script>
+
+(function() {
+  'use strict';
+
+  var DomApi = Polymer.DomApi.ctor;
+
+  /**
+   * DomApi.classList allows maniuplation of `classList` compatible with 
+   * Polymer.dom. The general usage is 
+   * `Polymer.dom(node).classList.method(arguments)` where methods and arguments
+   * match native DOM.
+   */
+  Object.defineProperty(DomApi.prototype, 'classList', {
+    get: function() {
+      if (!this._classList) {
+        this._classList = new DomApi.ClassList(this);
+      }
+      return this._classList;
+    },
+    configurable: true
+  });
+
+  DomApi.ClassList = function(host) {
+    this.domApi = host;
+    this.node = host.node;
+  }
+
+  DomApi.ClassList.prototype = {
+    add: function() {
+      this.node.classList.add.apply(this.node.classList, arguments);
+      this.domApi._distributeParent();
+    },
+
+    remove: function() {
+      this.node.classList.remove.apply(this.node.classList, arguments);
+      this.domApi._distributeParent();
+    },
+
+    toggle: function() {
+      this.node.classList.toggle.apply(this.node.classList, arguments);
+      this.domApi._distributeParent();
+    },
+    contains: function() {
+      return this.node.classList.contains.apply(this.node.classList,
+        arguments);
+    }
+  }
+
+})();
+</script>

src/lib/dom-api-distributed-nodes-observer.html

@@ -0,0 +1,95 @@
+<!--
+@license
+Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+-->
+<link rel="import" href="settings.html">
+<script>
+(function() {
+  'use strict';
+
+    var DomApi = Polymer.DomApi.ctor;
+    var Settings = Polymer.Settings;
+
+    /**
+     * DomApi.DistributedNodesObserver notifies when the list returned by 
+     * a <content> element's `getDistributedNodes()` may have changed.
+     * It is not meant to be used directly; it is used by
+     * `Polymer.dom(node).observeNodes(callback)` to observe changes to
+     * `<content>.getDistributedNodes()`.
+     */
+    DomApi.DistributedNodesObserver = function(domApi) {
+      DomApi.EffectiveNodesObserver.call(this, domApi);
+    };
+
+    DomApi.DistributedNodesObserver.prototype = 
+      Object.create(DomApi.EffectiveNodesObserver.prototype);
+
+    Polymer.Base.extend(DomApi.DistributedNodesObserver.prototype, {
+
+      // NOTE: ShadyDOM distribute provokes notification of these observers
+      // so no setup is required.
+      _setup: function() {},
+
+      _cleanup: function() {},
+
+      // no need to update sub-elements since <content> does not nest
+      // (but note that <slot> will)
+      _beforeCallListeners: function() {},
+
+      _getEffectiveNodes: function() {
+        return this.domApi.getDistributedNodes();
+      }
+
+    });
+
+    if (Settings.useShadow) {
+
+      Polymer.Base.extend(DomApi.DistributedNodesObserver.prototype, {
+
+        // NOTE: Under ShadowDOM we must observe the host element for
+        // changes.
+        _setup: function() {
+          if (!this._observer) {
+            var root = this.domApi.getOwnerRoot();
+            var host = root && root.host;
+            if (host) {
+              this._observer = Polymer.dom(host).observeNodes(
+                this._scheduleNotify.bind(this));
+              // NOTE: we identify this listener as needed for <content>
+              // notification so that enableShadowAttributeTracking 
+              // can find these observers an ensure that we pass always 
+              // pass notifications down.
+              this._observer._isContentListener = true;
+              if (this._hasAttrSelect()) {
+                Polymer.dom(host).observer.enableShadowAttributeTracking();
+              }
+            }
+          }
+        },
+
+        _hasAttrSelect: function() {
+          var select = this.node.getAttribute('select');
+          return select && select.match(/[[.]+/);
+        },
+
+        _cleanup: function() {
+          var root = this.domApi.getOwnerRoot();
+          var host = root && root.host;
+          if (host) {
+            Polymer.dom(host).unobserveNodes(this._observer);
+          }
+          this._observer = null;
+        }
+
+      });
+
+    }
+
+})();
+
+</script>