Roll Polymer to 1.3.1

third_party/polymer/v1_0/components-chromium/iron-overlay-behavior/iron-overlay-behavior-extracted.js

 /**
 Use `Polymer.IronOverlayBehavior` to implement an element that can be hidden or shown, and displays
 on top of other content. It includes an optional backdrop, and can be used to implement a variety
 of UI controls including dialogs and drop downs. Multiple overlays may be displayed at once.
 
 ### Closing and canceling
 
 A dialog may be hidden by closing or canceling. The difference between close and cancel is user
 intent. Closing generally implies that the user acknowledged the content on the overlay. By default,
 it will cancel whenever the user taps outside it or presses the escape key. This behavior is
@@ skipping 82 matching lines @@
 
       /**
        * Returns the reason this dialog was last closed.
        */
       closingReason: {
         // was a getter before, but needs to be a property so other
         // behaviors can override this.
         type: Object
       },
 
+      /**
+       * The HTMLElement that will be firing relevant KeyboardEvents.
+       * Used for capturing esc and tab. Overridden from `IronA11yKeysBehavior`.
+       */
+      keyEventTarget: {
+        type: Object,
+        value: document
+      },
+
+      /**
+       * Set to true to enable restoring of focus when overlay is closed.
+       */
+      restoreFocusOnClose: {
+        type: Boolean,
+        value: false
+      },
+
       _manager: {
         type: Object,
         value: Polymer.IronOverlayManager
       },
 
       _boundOnCaptureClick: {
         type: Function,
         value: function() {
           return this._onCaptureClick.bind(this);
         }
       },
 
-      _boundOnCaptureKeydown: {
-        type: Function,
-        value: function() {
-          return this._onCaptureKeydown.bind(this);
-        }
-      },
-
       _boundOnCaptureFocus: {
         type: Function,
         value: function() {
           return this._onCaptureFocus.bind(this);
         }
       },
 
-      /** @type {?Node} */
+      /**
+       * The node being focused.
+       * @type {?Node}
+       */
       _focusedChild: {
         type: Object
       }
 
     },
 
+    keyBindings: {
+      'esc': '__onEsc',
+      'tab': '__onTab'
+    },
+
     listeners: {
       'iron-resize': '_onIronResize'
     },
 
     /**
      * The backdrop element.
-     * @type Node
+     * @type {Node}
      */
     get backdropElement() {
       return this._manager.backdropElement;
     },
 
+    /**
+     * Returns the node to give focus to.
+     * @type {Node}
+     */
     get _focusNode() {
       return this._focusedChild || Polymer.dom(this).querySelector('[autofocus]') || this;
     },
 
+    /**
+     * Array of nodes that can receive focus (overlay included), ordered by `tabindex`.
+     * This is used to retrieve which is the first and last focusable nodes in order
+     * to wrap the focus for overlays `with-backdrop`.
+     *
+     * If you know what is your content (specifically the first and last focusable children),
+     * you can override this method to return only `[firstFocusable, lastFocusable];`
+     * @type {[Node]}
+     * @protected
+     */
+    get _focusableNodes() {
+      // Elements that can be focused even if they have [disabled] attribute.
+      var FOCUSABLE_WITH_DISABLED = [
+        'a[href]',
+        'area[href]',
+        'iframe',
+        '[tabindex]',
+        '[contentEditable=true]'
+      ];
+
+      // Elements that cannot be focused if they have [disabled] attribute.
+      var FOCUSABLE_WITHOUT_DISABLED = [
+        'input',
+        'select',
+        'textarea',
+        'button'
+      ];
+
+      // Discard elements with tabindex=-1 (makes them not focusable).
+      var selector = FOCUSABLE_WITH_DISABLED.join(':not([tabindex="-1"]),') +
+        ':not([tabindex="-1"]),' +
+        FOCUSABLE_WITHOUT_DISABLED.join(':not([disabled]):not([tabindex="-1"]),') +
+        ':not([disabled]):not([tabindex="-1"])';
+
+      var focusables = Polymer.dom(this).querySelectorAll(selector);
+      if (this.tabIndex >= 0) {
+        // Insert at the beginning because we might have all elements with tabIndex = 0,
+        // and the overlay should be the first of the list.
+        focusables.splice(0, 0, this);
+      }
+      // Sort by tabindex.
+      return focusables.sort(function (a, b) {
+        if (a.tabIndex === b.tabIndex) {
+          return 0;
+        }
+        if (a.tabIndex === 0 || a.tabIndex > b.tabIndex) {
+          return 1;
+        }
+        return -1;
+      });
+    },
+
     ready: function() {
-      // with-backdrop need tabindex to be set in order to trap the focus.
+      // with-backdrop needs tabindex to be set in order to trap the focus.
       // If it is not set, IronOverlayBehavior will set it, and remove it if with-backdrop = false.
       this.__shouldRemoveTabIndex = false;
+      // Used for wrapping the focus on TAB / Shift+TAB.
+      this.__firstFocusableNode = this.__lastFocusableNode = null;
       this._ensureSetup();
     },
 
     attached: function() {
       // Call _openedChanged here so that position can be computed correctly.
-      if (this._callOpenedWhenReady) {
+      if (this.opened) {
         this._openedChanged();
       }
+      this._observer = Polymer.dom(this).observeNodes(this._onNodesChange);
     },
 
     detached: function() {
+      Polymer.dom(this).unobserveNodes(this._observer);
+      this._observer = null;
       this.opened = false;
       this._manager.trackBackdrop(this);
       this._manager.removeOverlay(this);
     },
 
     /**
      * Toggle the opened state of the overlay.
      */
     toggle: function() {
       this._setCanceled(false);
@@ skipping 11 matching lines @@
     /**
      * Close the overlay.
      */
     close: function() {
       this._setCanceled(false);
       this.opened = false;
     },
 
     /**
      * Cancels the overlay.
+     * @param {?Event} event The original event
      */
-    cancel: function() {
-      var cancelEvent = this.fire('iron-overlay-canceled', undefined, {cancelable: true});
+    cancel: function(event) {
+      var cancelEvent = this.fire('iron-overlay-canceled', event, {cancelable: true});
       if (cancelEvent.defaultPrevented) {
         return;
       }
 
       this._setCanceled(true);
       this.opened = false;
     },
 
     _ensureSetup: function() {
       if (this._overlaySetup) {
         return;
       }
       this._overlaySetup = true;
       this.style.outline = 'none';
       this.style.display = 'none';
     },
 
     _openedChanged: function() {
       if (this.opened) {
         this.removeAttribute('aria-hidden');
       } else {
         this.setAttribute('aria-hidden', 'true');
-        Polymer.dom(this).unobserveNodes(this._observer);
       }
 
       // wait to call after ready only if we're initially open
       if (!this._overlaySetup) {
-        this._callOpenedWhenReady = this.opened;
         return;
       }
 
       this._manager.trackBackdrop(this);
 
       if (this.opened) {
         this._prepareRenderOpened();
       }
 
       if (this._openChangedAsync) {
@@ skipping 54 matching lines @@
         node.addEventListener(event, boundListener, capture);
       } else {
         // disable document-wide tap recognizer
         if (event === 'tap') {
           Polymer.Gestures.remove(document, 'tap', null);
         }
         node.removeEventListener(event, boundListener, capture);
       }
     },
 
-    _toggleListeners: function () {
+    _toggleListeners: function() {
       this._toggleListener(this.opened, document, 'tap', this._boundOnCaptureClick, true);
-      this._toggleListener(this.opened, document, 'keydown', this._boundOnCaptureKeydown, true);
       this._toggleListener(this.opened, document, 'focus', this._boundOnCaptureFocus, true);
     },
 
     // tasks which must occur before opening; e.g. making the element visible
     _prepareRenderOpened: function() {
+
       this._manager.addOverlay(this);
 
+      // Needed to calculate the size of the overlay so that transitions on its size
+      // will have the correct starting points.
       this._preparePositioning();
       this.fit();
       this._finishPositioning();
 
       if (this.withBackdrop) {
         this.backdropElement.prepare();
       }
+
+      // Safari will apply the focus to the autofocus element when displayed for the first time,
+      // so we blur it. Later, _applyFocus will set the focus if necessary.
+      if (this.noAutoFocus && document.activeElement === this._focusNode) {
+        this._focusNode.blur();
+      }
     },
 
     // tasks which cause the overlay to actually open; typically play an
     // animation
     _renderOpened: function() {
       if (this.withBackdrop) {
         this.backdropElement.open();
       }
       this._finishRenderOpened();
     },
 
     _renderClosed: function() {
       if (this.withBackdrop) {
         this.backdropElement.close();
       }
       this._finishRenderClosed();
     },
 
     _finishRenderOpened: function() {
-      // focus the child node with [autofocus]
+      // This ensures the overlay is visible before we set the focus
+      // (by calling _onIronResize -> refit).
+      this.notifyResize();
+      // Focus the child node with [autofocus]
       this._applyFocus();
 
-      this._observer = Polymer.dom(this).observeNodes(this.notifyResize);
       this.fire('iron-overlay-opened');
     },
 
     _finishRenderClosed: function() {
-      // hide the overlay and remove the backdrop
+      // Hide the overlay and remove the backdrop.
       this.resetFit();
       this.style.display = 'none';
       this._manager.removeOverlay(this);
 
-      this._focusedChild = null;
       this._applyFocus();
+      this.notifyResize();
 
-      this.notifyResize();
       this.fire('iron-overlay-closed', this.closingReason);
     },
 
     _preparePositioning: function() {
       this.style.transition = this.style.webkitTransition = 'none';
       this.style.transform = this.style.webkitTransform = 'none';
       this.style.display = '';
     },
 
     _finishPositioning: function() {
       this.style.display = 'none';
       this.style.transform = this.style.webkitTransform = '';
-      // force layout to avoid application of transform
-      /** @suppress {suspiciousCode} */ this.offsetWidth;
+      // Force layout layout to avoid application of transform.
+      // Set offsetWidth to itself so that compilers won't remove it.
+      this.offsetWidth = this.offsetWidth;
       this.style.transition = this.style.webkitTransition = '';
     },
 
     _applyFocus: function() {
       if (this.opened) {
         if (!this.noAutoFocus) {
           this._focusNode.focus();
         }
       } else {
         this._focusNode.blur();
+        this._focusedChild = null;
         this._manager.focusOverlay();
       }
     },
 
     _onCaptureClick: function(event) {
       if (this._manager.currentOverlay() === this &&
           Polymer.dom(event).path.indexOf(this) === -1) {
         if (this.noCancelOnOutsideClick) {
           this._applyFocus();
         } else {
-          this.cancel();
+          this.cancel(event);
         }
       }
     },
 
-    _onCaptureKeydown: function(event) {
-      var ESC = 27;
-      if (this._manager.currentOverlay() === this &&
-          !this.noCancelOnEscKey &&
-          event.keyCode === ESC) {
-        this.cancel();
-      }
-    },
-
     _onCaptureFocus: function (event) {
-      if (this._manager.currentOverlay() === this &&
-          this.withBackdrop) {
+      if (this._manager.currentOverlay() === this && this.withBackdrop) {
         var path = Polymer.dom(event).path;
         if (path.indexOf(this) === -1) {
           event.stopPropagation();
           this._applyFocus();
         } else {
           this._focusedChild = path[0];
         }
       }
     },
 
     _onIronResize: function() {
       if (this.opened) {
         this.refit();
       }
+    },
+
+    /**
+     * @protected
+     * Will call notifyResize if overlay is opened.
+     * Can be overridden in order to avoid multiple observers on the same node.
+     */
+    _onNodesChange: function() {
+      if (this.opened) {
+        this.notifyResize();
+      }
+      // Store it so we don't query too much.
+      var focusableNodes = this._focusableNodes;
+      this.__firstFocusableNode = focusableNodes[0];
+      this.__lastFocusableNode = focusableNodes[focusableNodes.length - 1];
+    },
+
+    __onEsc: function(event) {
+      // Not opened or not on top, so return.
+      if (this._manager.currentOverlay() !== this) {
+        return;
+      }
+      if (!this.noCancelOnEscKey) {
+        this.cancel(event);
+      }
+    },
+
+    __onTab: function(event) {
+      // Not opened or not on top, so return.
+      if (this._manager.currentOverlay() !== this) {
+        return;
+      }
+      // TAB wraps from last to first focusable.
+      // Shift + TAB wraps from first to last focusable.
+      var shift = event.detail.keyboardEvent.shiftKey;
+      var nodeToCheck = shift ? this.__firstFocusableNode : this.__lastFocusableNode;
+      var nodeToSet = shift ? this.__lastFocusableNode : this.__firstFocusableNode;
+      if (this.withBackdrop && this._focusedChild === nodeToCheck) {
+        // We set here the _focusedChild so that _onCaptureFocus will handle the
+        // wrapping of the focus (the next event after tab is focus).
+        this._focusedChild = nodeToSet;
+      }
     }
-
-/**
- * Fired after the `iron-overlay` opens.
- * @event iron-overlay-opened
- */
-
-/**
- * Fired when the `iron-overlay` is canceled, but before it is closed.
- * Cancel the event to prevent the `iron-overlay` from closing.
- * @event iron-overlay-canceled
- */
-
-/**
- * Fired after the `iron-overlay` closes.
- * @event iron-overlay-closed
- * @param {{canceled: (boolean|undefined)}} set to the `closingReason` attribute
- */
   };
 
   /** @polymerBehavior */
-  Polymer.IronOverlayBehavior = [Polymer.IronFitBehavior, Polymer.IronResizableBehavior, Polymer.IronOverlayBehaviorImpl];
+  Polymer.IronOverlayBehavior = [Polymer.IronA11yKeysBehavior, Polymer.IronFitBehavior, Polymer.IronResizableBehavior, Polymer.IronOverlayBehaviorImpl];
+
+  /**
+  * Fired after the `iron-overlay` opens.
+  * @event iron-overlay-opened
+  */
+
+  /**
+  * Fired when the `iron-overlay` is canceled, but before it is closed.
+  * Cancel the event to prevent the `iron-overlay` from closing.
+  * @event iron-overlay-canceled
+  * @param {Event} event The closing of the `iron-overlay` can be prevented
+  * by calling `event.preventDefault()`. The `event.detail` is the original event that originated
+  * the canceling (e.g. ESC keyboard event or click event outside the `iron-overlay`).
+  */
+
+  /**
+  * Fired after the `iron-overlay` closes.
+  * @event iron-overlay-closed
+  * @param {{canceled: (boolean|undefined)}} closingReason Contains `canceled` (whether the overlay was canceled).
+  */