iron-views.html

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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
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<link rel="import" href="../polymer/polymer.html">
<link rel="import" href="../iron-resizable-behavior/iron-resizable-behavior.html">
<link rel="import" href="../iron-selector/iron-selectable.html">

<!--
`iron-views` is directly derived from [Polymer's iron-pages](https://github.com/PolymerElements/iron-pages).

`iron-pages` was forked because it hides unselected pages by using `display: none` which is currently [not an option with Electron's webviews](http://electron.atom.io/docs/api/web-view-tag/#css-styling-notes)

The Example remains the same as for `iron-pages`:

    <iron-views selected="0">
      <div>One</div>
      <div>Two</div>
      <div>Three</div>
    </iron-views>

    <script>
      document.addEventListener('click', function(e) {
        var views = document.querySelector('iron-views');
        views.selectNext();
      });
    </script>

@demo demo/index.html
-->

<dom-module id="iron-views">

  <template>
    <style>
      :host {
        display: block;
      }

      :host > ::content > :not(.iron-selected) {
        max-width: 0px !important;
        max-height: 0px !important;
        padding: 0px !important;
        overflow: hidden !important;
      }
    </style>

    <content></content>
  </template>

  <script>
    Polymer({

      is: 'iron-views',

      behaviors: [
        Polymer.IronResizableBehavior,
        Polymer.IronSelectableBehavior
      ],

      properties: {

        // as the selected page is the only one visible, activateEvent
        // is both non-sensical and problematic; e.g. in cases where a user
        // handler attempts to change the page and the activateEvent
        // handler immediately changes it back
        activateEvent: {
          type: String,
          value: null
        }

      },

      observers: [
        '_selectedPageChanged(selected)'
      ],

      _selectedPageChanged: function(selected, old) {
        this.async(this.notifyResize);
      }
    });

  </script>
</dom-module>