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third_party/polymer/v0_8/components-chromium/paper-dialog-behavior/paper-dialog-behavior-extracted.js

Index: third_party/polymer/v0_8/components-chromium/paper-dialog-behavior/paper-dialog-behavior-extracted.js
diff --git a/third_party/polymer/v0_8/components-chromium/paper-dialog-behavior/paper-dialog-behavior-extracted.js b/third_party/polymer/v0_8/components-chromium/paper-dialog-behavior/paper-dialog-behavior-extracted.js
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+
+
+/*
+Use `Polymer.PaperDialogBehavior` and `paper-dialog-common.css` to implement a Material Design
+dialog.
+
+For example, if `<paper-dialog-impl>` implements this behavior:
+
+    <paper-dialog-impl>
+        <h2>Header</h2>
+        <div>Dialog body</div>
+        <div class="buttons">
+            <paper-button dialog-dismiss>Cancel</paper-button>
+            <paper-button dialog-confirm>Accept</paper-button>
+        </div>
+    </paper-dialog-impl>
+
+`paper-dialog-common.css` provide styles for a header, content area, and an action area for buttons.
+Use the `<h2>` tag for the header and the `buttons` class for the action area. You can use the
+`paper-dialog-scrollable` element (in its own repository) if you need a scrolling content area.
+
+Use the `dialog-dismiss` and `dialog-confirm` attributes on interactive controls to close the
+dialog. If the user dismisses the dialog with `dialog-confirm`, the `closingReason` will update
+to include `confirmed: true`.
+
+### Styling
+
+The following custom properties and mixins are available for styling.
+
+Custom property | Description | Default
+----------------|-------------|----------
+`--paper-dialog-background-color` | Dialog background color                     | `--primary-background-color`
+`--paper-dialog-color`            | Dialog foreground color                     | `--primary-text-color`
+`--paper-dialog`                  | Mixin applied to the dialog                 | `{}`
+`--paper-dialog-title`            | Mixin applied to the title (`<h2>`) element | `{}`
+`--paper-dialog-button-color`     | Button area foreground color                | `--default-primary-color`
+
+### Accessibility
+
+This element has `role="dialog"` by default. Depending on the context, it may be more appropriate
+to override this attribute with `role="alertdialog"`. The header (a `<h2>` element) will
+
+If `modal` is set, the element will set `aria-modal` and prevent the focus from exiting the element.
+It will also ensure that focus remains in the dialog.
+
+The `aria-labelledby` attribute will be set to the header element, if one exists.
+
+@hero hero.svg
+@demo demo/index.html
+@polymerBehavior Polymer.PaperDialogBehavior
+*/
+
+  Polymer.PaperDialogBehaviorImpl = {
+
+    hostAttributes: {
+      'role': 'dialog',
+      'tabindex': '-1'
+    },
+
+    properties: {
+
+      /**
+       * If `modal` is true, this implies `no-cancel-on-outside-click` and `with-backdrop`.
+       */
+      modal: {
+        observer: '_modalChanged',
+        type: Boolean,
+        value: false
+      },
+
+      _lastFocusedElement: {
+        type: Node
+      },
+
+      _boundOnFocus: {
+        type: Function,
+        value: function() {
+          return this._onFocus.bind(this);
+        }
+      },
+
+      _boundOnBackdropClick: {
+        type: Function,
+        value: function() {
+          return this._onBackdropClick.bind(this);
+        }
+      }
+
+    },
+
+    listeners: {
+      'click': '_onDialogClick',
+      'iron-overlay-opened': '_onIronOverlayOpened',
+      'iron-overlay-closed': '_onIronOverlayClosed'
+    },
+
+    attached: function() {
+      this._observer = this._observe(this);
+      this._updateAriaLabelledBy();
+    },
+
+    detached: function() {
+      if (this._observer) {
+        this._observer.disconnect();
+      }
+    },
+
+    _observe: function(node) {
+      var observer = new MutationObserver(function() {
+        this._updateAriaLabelledBy();
+      }.bind(this));
+      observer.observe(node, {
+        childList: true,
+        subtree: true
+      });
+      return observer;
+    },
+
+    _modalChanged: function() {
+      if (this.modal) {
+        this.setAttribute('aria-modal', 'true');
+      } else {
+        this.setAttribute('aria-modal', 'false');
+      }
+      // modal implies noCancelOnOutsideClick and withBackdrop if true, don't overwrite
+      // those properties otherwise.
+      if (this.modal) {
+        this.noCancelOnOutsideClick = true;
+        this.withBackdrop = true;
+      }
+    },
+
+    _updateAriaLabelledBy: function() {
+      var header = Polymer.dom(this).querySelector('h2');
+      if (!header) {
+        this.removeAttribute('aria-labelledby');
+        return;
+      }
+      var headerId = header.getAttribute('id');
+      if (headerId && this.getAttribute('aria-labelledby') === headerId) {
+        return;
+      }
+      // set aria-describedBy to the header element
+      var labelledById;
+      if (headerId) {
+        labelledById = headerId;
+      } else {
+        labelledById = 'paper-dialog-header-' + new Date().getUTCMilliseconds();
+        header.setAttribute('id', labelledById);
+      }
+      this.setAttribute('aria-labelledby', labelledById);
+    },
+
+    _updateClosingReasonConfirmed: function(confirmed) {
+      this.closingReason = this.closingReason || {};
+      this.closingReason.confirmed = confirmed;
+    },
+
+    _onDialogClick: function(event) {
+      var target = event.target;
+      while (target !== this) {
+        if (target.hasAttribute('dialog-dismiss')) {
+          this._updateClosingReasonConfirmed(false);
+          this.close();
+          break;
+        } else if (target.hasAttribute('dialog-confirm')) {
+          this._updateClosingReasonConfirmed(true);
+          this.close();
+          break;
+        }
+        target = target.parentNode;
+      }
+    },
+
+    _onIronOverlayOpened: function() {
+      if (this.modal) {
+        document.body.addEventListener('focus', this._boundOnFocus, true);
+        this.backdropElement.addEventListener('click', this._boundOnBackdropClick);
+      }
+    },
+
+    _onIronOverlayClosed: function() {
+      document.body.removeEventListener('focus', this._boundOnFocus, true);
+      this.backdropElement.removeEventListener('click', this._boundOnBackdropClick);
+    },
+
+    _onFocus: function(event) {
+      if (this.modal) {
+        var target = event.target;
+        while (target && target !== this && target !== document.body) {
+          target = target.parentNode;
+        }
+        if (target) {
+          if (target === document.body) {
+            if (this._lastFocusedElement) {
+              this._lastFocusedElement.focus();
+            } else {
+              this._focusNode.focus();
+            }
+          } else {
+            this._lastFocusedElement = event.target;
+          }
+        }
+      }
+    },
+
+    _onBackdropClick: function() {
+      if (this.modal) {
+        if (this._lastFocusedElement) {
+          this._lastFocusedElement.focus();
+        } else {
+          this._focusNode.focus();
+        }
+      }
+    }
+
+  };
+
+  /** @polymerBehavior */
+  Polymer.PaperDialogBehavior = [Polymer.IronOverlayBehavior, Polymer.PaperDialogBehaviorImpl];
+