[third_party] add polymer 1.2.3

polymer_1.2.3/bower_components/iron-behaviors/iron-button-state.html

 <!--
 @license
 Copyright (c) 2015 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
 -->
 
@@ skipping 32 matching lines @@
         reflectToAttribute: true
       },
 
       /**
        * If true, the button is a toggle and is currently in the active state.
        */
       active: {
         type: Boolean,
         value: false,
         notify: true,
-        reflectToAttribute: true,
-        observer: '_activeChanged'
+        reflectToAttribute: true
       },
 
       /**
        * True if the element is currently being pressed by a "pointer," which
        * is loosely defined as mouse or touch input (but specifically excluding
        * keyboard input).
        */
       pointerDown: {
         type: Boolean,
         readOnly: true,
         value: false
       },
 
       /**
        * True if the input device that caused the element to receive focus
        * was a keyboard.
        */
       receivedFocusFromKeyboard: {
         type: Boolean,
         readOnly: true
+      },
+
+      /**
+       * The aria attribute to be set if the button is a toggle and in the
+       * active state.
+       */
+      ariaActiveAttribute: {
+        type: String,
+        value: 'aria-pressed',
+        observer: '_ariaActiveAttributeChanged'
       }
     },
 
     listeners: {
       down: '_downHandler',
       up: '_upHandler',
       tap: '_tapHandler'
     },
 
     observers: [
-      '_detectKeyboardFocus(focused)'
+      '_detectKeyboardFocus(focused)',
+      '_activeChanged(active, ariaActiveAttribute)'
     ],
 
     keyBindings: {
       'enter:keydown': '_asyncClick',
       'space:keydown': '_spaceKeyDownHandler',
       'space:keyup': '_spaceKeyUpHandler',
     },
 
+    _mouseEventRe: /^mouse/,
+
     _tapHandler: function() {
       if (this.toggles) {
        // a tap is needed to toggle the active state
         this._userActivate(!this.active);
       } else {
         this.active = false;
       }
     },
 
     _detectKeyboardFocus: function(focused) {
       this._setReceivedFocusFromKeyboard(!this.pointerDown && focused);
     },
 
     // to emulate native checkbox, (de-)activations from a user interaction fire
     // 'change' events
     _userActivate: function(active) {
-      this.active = active;
-      this.fire('change');
+      if (this.active !== active) {
+        this.active = active;
+        this.fire('change');
+      }
     },
 
-    _downHandler: function() {
+    _downHandler: function(event) {
       this._setPointerDown(true);
       this._setPressed(true);
       this._setReceivedFocusFromKeyboard(false);
     },
 
     _upHandler: function() {
       this._setPointerDown(false);
       this._setPressed(false);
     },
 
+    /**
+     * @param {!KeyboardEvent} event .
+     */
     _spaceKeyDownHandler: function(event) {
       var keyboardEvent = event.detail.keyboardEvent;
+      var target = Polymer.dom(keyboardEvent).localTarget;
+
+      // Ignore the event if this is coming from a focused light child, since that
+      // element will deal with it.
+      if (this.isLightDescendant(/** @type {Node} */(target)))
+        return;
+
       keyboardEvent.preventDefault();
       keyboardEvent.stopImmediatePropagation();
       this._setPressed(true);
     },
 
-    _spaceKeyUpHandler: function() {
+    /**
+     * @param {!KeyboardEvent} event .
+     */
+    _spaceKeyUpHandler: function(event) {
+      var keyboardEvent = event.detail.keyboardEvent;
+      var target = Polymer.dom(keyboardEvent).localTarget;
+
+      // Ignore the event if this is coming from a focused light child, since that
+      // element will deal with it.
+      if (this.isLightDescendant(/** @type {Node} */(target)))
+        return;
+
       if (this.pressed) {
         this._asyncClick();
       }
       this._setPressed(false);
     },
 
     // trigger click asynchronously, the asynchrony is useful to allow one
     // event handler to unwind before triggering another event
     _asyncClick: function() {
       this.async(function() {
         this.click();
       }, 1);
     },
 
     // any of these changes are considered a change to button state
 
     _pressedChanged: function(pressed) {
       this._changedButtonState();
     },
 
-    _activeChanged: function(active) {
+    _ariaActiveAttributeChanged: function(value, oldValue) {
+      if (oldValue && oldValue != value && this.hasAttribute(oldValue)) {
+        this.removeAttribute(oldValue);
+      }
+    },
+
+    _activeChanged: function(active, ariaActiveAttribute) {
       if (this.toggles) {
-        this.setAttribute('aria-pressed', active ? 'true' : 'false');
+        this.setAttribute(this.ariaActiveAttribute,
+                          active ? 'true' : 'false');
       } else {
-        this.removeAttribute('aria-pressed');
+        this.removeAttribute(this.ariaActiveAttribute);
       }
       this._changedButtonState();
     },
 
     _controlStateChanged: function() {
       if (this.disabled) {
         this._setPressed(false);
       } else {
         this._changedButtonState();
       }
     },
 
     // provide hook for follow-on behaviors to react to button-state
 
     _changedButtonState: function() {
       if (this._buttonStateChanged) {
         this._buttonStateChanged(); // abstract
       }
     }
 
   };
 
   /** @polymerBehavior */
   Polymer.IronButtonState = [
     Polymer.IronA11yKeysBehavior,
     Polymer.IronButtonStateImpl
   ];
 
 </script>