Import Polymer 0.8 and several key elements.

third_party/polymer/v0_8/components-chromium/polymer/src/micro/behaviors-extracted.js

+
+
+  /**
+   * Automatically extend using objects referenced in `behaviors` array.
+   *
+   *     someBehaviorObject = {
+   *       accessors: {
+   *        value: {type: Number, observer: '_numberChanged'}
+   *       },
+   *       observers: [
+   *         // ...
+   *       ],
+   *       ready: function() {
+   *         // called before prototoype's ready
+   *       },
+   *       _numberChanged: function() {}
+   *     };
+   *
+   *     Polymer({
+   *
+   *       behaviors: [
+   *         someBehaviorObject
+   *       ]
+   *
+   *       ...
+   *
+   *     });
+   *
+   * @class base feature: behaviors
+   */
+
+  Polymer.Base._addFeature({
+
+    behaviors: [],
+
+    _prepBehaviors: function() {
+      this._flattenBehaviors();
+      this._prepBehavior(this);
+      this.behaviors.forEach(function(b) {
+        this._mixinBehavior(b);
+        this._prepBehavior(b);
+      }, this);
+    },
+
+    _flattenBehaviors: function() {
+      var flat = [];
+      this.behaviors.forEach(function(b) {
+        if (!b) {
+          console.warn('Polymer: undefined behavior in [' + this.is + ']');
+        } else if (b instanceof Array) {
+          flat = flat.concat(b);
+        } else {
+          flat.push(b);
+        }
+      }, this);
+      this.behaviors = flat;
+    },
+
+    _mixinBehavior: function(b) {
+      Object.getOwnPropertyNames(b).forEach(function(n) {
+        switch (n) {
+          case 'registered':
+          case 'properties':
+          case 'observers':
+          case 'listeners':
+          case 'keyPresses':
+          case 'hostAttributes':
+          case 'created':
+          case 'attached':
+          case 'detached':
+          case 'attributeChanged':
+          case 'configure':
+          case 'ready':
+            break;
+          default:
+            this.copyOwnProperty(n, b, this);
+            break;
+        }
+      }, this);
+    },
+
+    _doBehavior: function(name, args) {
+      this.behaviors.forEach(function(b) {
+        this._invokeBehavior(b, name, args);
+      }, this);
+      this._invokeBehavior(this, name, args);
+    },
+
+    _invokeBehavior: function(b, name, args) {
+      var fn = b[name];
+      if (fn) {
+        fn.apply(this, args || Polymer.nar);
+      }
+    },
+
+    _marshalBehaviors: function() {
+      this.behaviors.forEach(function(b) {
+        this._marshalBehavior(b);
+      }, this);
+      this._marshalBehavior(this);
+    }
+
+  });
+