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bower_components/paper-dialog-behavior/paper-dialog-behavior.html 7.22 KB
e619a3b0   Luigi Serra   Controllet cross ...
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  <!--
  @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
  -->
  
  <link rel="import" href="../polymer/polymer.html">
  <link rel="import" href="../iron-overlay-behavior/iron-overlay-behavior.html">
  <link rel="import" href="../paper-styles/paper-styles.html">
  
  <script>
  
  /**
  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"`.
  
  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
        },
  
        /** @type {?Node} */
        _lastFocusedElement: {
          type: Object
        },
  
        _boundOnFocus: {
          type: Function,
          value: function() {
            return this._onFocus.bind(this);
          }
        },
  
        _boundOnBackdropClick: {
          type: Function,
          value: function() {
            return this._onBackdropClick.bind(this);
          }
        }
  
      },
  
      listeners: {
        'tap': '_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 && target !== this) {
          if (target.hasAttribute) {
            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];
  
  </script>