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third_party/polymer/components-chromium/core-animated-pages/core-animated-pages.html

Index: third_party/polymer/components-chromium/core-animated-pages/core-animated-pages.html
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+<link href="../core-selector/core-selector.html" rel="import">
+
+<link href="transitions/hero-transition.html" rel="import">
+<link href="transitions/cross-fade.html" rel="import">
+
+<!--
+
+`core-animated-pages` selects one of its children "pages" to show and runs a transition
+when switching between them. The transitions are designed to be pluggable, and can
+accept any object that is an instance of a `core-transition-pages`. Transitions to run
+are specified in the `transitions` attribute as a space-delimited string of `id`s of
+transition elements. Several transitions are available with `core-animated-pages` by
+default, including `hero-transition`, `cross-fade`, and `tile-cascade`.
+
+Example:
+
+    <style>
+      #hero1 {
+        position: absolute;
+        top: 0;
+        left: 0;
+        width: 300px;
+        height: 300px;
+        background-color: orange;
+      }
+      #hero2 {
+        position: absolute;
+        top: 200px;
+        left: 300px;
+        width: 300px;
+        height: 300px;
+        background-color: orange;
+      }
+      #bottom1, #bottom2 {
+        position: absolute;
+        bottom: 0;
+        top: 0;
+        left: 0;
+        height: 50px;
+      }
+      #bottom1 {
+        background-color: blue;
+      }
+      #bottom2 {
+        background-color: green;
+      }
+    </style>
+    // hero-transition and cross-fade are declared elsewhere
+    <core-animated-pages transitions="hero-transition cross-fade">
+      <section id="page1">
+        <div id="hero1" hero-id="hero" hero></div>
+        <div id="bottom1" cross-fade></div>
+      </section>
+      <section id="page2">
+        <div id="hero2" hero-id="hero" hero></div>
+        <div id="bottom2" cross-fade></div>
+      </section>
+    </core-animated-pages>
+
+In the above example, two transitions (`hero-transition` and `cross-fade`) are run when switching
+between `page1` and `page2`. `hero-transition` transforms elements with the same `hero-id` such
+that they appear to be shared across different pages. `cross-fade` fades out the elements marked
+`cross-fade` in the outgoing page, and fades in those in the incoming page. See the individual
+transition's documentation for specific details.
+
+Finding elements to transition
+------------------------------
+
+In general, a transition is applied to elements marked with a certain attribute. For example,
+`hero-transition` applies the transition on elements with the `hero` and `hero-id` attribute.
+Among the transitions included with `core-animated-pages`, script-based transitions such as
+`hero-transition` generally look for elements up to one level of shadowRoot from the
+`core-animated-pages` element, and CSS-based transitions such as `cross-fade` look for elements
+within any shadowRoot within the `core-animated-pages` element. This means you can use 
+custom elements as pages and mark elements in their shadowRoots as heroes, or mark 
+elements in deeper shadowRoots with other transitions.
+
+Example:
+
+    <polymer-element name="x-el" noscript>
+    <template>
+      <style>
+        #hero {
+          position: absolute;
+          top: 0;
+          right: 0;
+          width: 50px;
+          height: 300px;
+          background-color: blue;
+        }
+      </style>
+      <div id="hero" hero-id="bar" hero></div>
+    </template>
+    </polymer-element>
+
+    <polymer-element name="x-page-1" noscript>
+    <template>
+      <style>
+        #hero1 {
+          position: absolute;
+          top: 0;
+          left: 0;
+          width: 300px;
+          height: 300px;
+          background-color: orange;
+        }
+      </style>
+      <div id="hero1" hero-id="foo" hero></div>
+      <div id="hero2" hero-id="bar" hero></div>
+    </template>
+    </polymer-element>
+
+    <polymer-element name="x-page-2" noscript>
+    <template>
+      <style>
+        #hero1 {
+          position: absolute;
+          top: 200px;
+          left: 300px;
+          width: 300px;
+          height: 300px;
+          background-color: orange;
+        }
+        #hero2 {
+          background-color: blue;
+          height: 150px;
+          width: 400px;
+        }
+      </style>
+      // The below element is one level of shadow from the core-animated-pages and will
+      // be transitioned.
+      <div id="hero1" hero-id="foo" hero></div>
+      // The below element contains a hero inside its shadowRoot making it two levels away
+      // from the core-animated-pages, and will not be transitioned.
+      <x-el></x-el>
+    </template>
+    </polymer-element>
+
+    <core-animated-pages transitions="hero-transition">
+      <x-page-1></x-page-1>
+      <x-page-2></x-page-2>
+    </core-animated-pages>
+
+Note that the container element of the page does not participate in the transition.
+
+    // This does not work
+    <core-animated-pages transitions="cross-fade">
+      <section cross-fade></section>
+      <section cross-fade></section>
+    </core-animated-pages>
+
+    // This works
+    <core-animated-pages transitions="cross-fade">
+      <section>
+        <div cross-fade></div>
+      </section>
+      <section>
+        <div cross-fade></div>
+      </section>
+    </core-animated-pages>
+
+Dynamically setting up transitions
+----------------------------------
+
+An easy way to dynamically set up transitions dynamically is to use property binding on
+the transition attributes. 
+
+Example:
+
+    <core-animated-pages selected="{{selected}}">
+      <section id="page1">
+        <div hero-id="hero" hero></div>
+      </section>
+      <section id="page2">
+        <div id="foo" hero-id="hero" hero?="{{selected === 1 || selected === 0}}" cross-fade="{{selected === 2}}"></div>
+      </section>
+      <section id="page3">
+      </section>
+    </core-animated-pages>
+
+In the above example, the "foo" element only behaves as a hero element if transitioning between
+`#page1` and `#page2`. It gets cross-faded when transition to or from `#page3`.
+
+Nesting pages
+-------------
+
+It is possible to nest core-animated-pages elements for organization. Excessive nesting is
+not encouraged, however, since it makes setting up the transition more complex.
+
+To nest core-animated-pages, the page containing the nested core-animated-pages element should
+have a `selectedItem` property bound to the `selectedItem` property of the nested element. This
+will allow the outer core-animated-pages to know which nested page it is actually transitioning
+to.
+
+Example:
+
+    <polymer-element name="nested-page" attributes="selectedItem">
+    <template>
+      <core-animated-pages selectedItem="{{selectedItem}}">
+        ...
+      </core-animated-pages>
+    </template>
+    </polymer-element>
+
+    <core-animated-pages>
+      <section id="page1"></section>
+      <nested-page id="page2"></section>
+    </core-animated-pages>
+
+@element core-animated-pages
+@extends core-selector
+@status beta
+@homepage github.io
+-->
+<!--
+Fired before a page transition occurs. Both pages involved in the transition are visible when
+this event fires. This is useful if there is something the client needs to do when a page becomes
+visible.
+
+@event core-animated-pages-transition-prepare
+-->
+<!--
+Fired when a page transition completes.
+
+@event core-animated-pages-transition-end
+-->
+<polymer-element name="core-animated-pages" extends="core-selector" notap="" attributes="transitions" assetpath="">
+
+<template>
+
+  <link href="core-animated-pages.css" rel="stylesheet">
+
+  <shadow></shadow>
+
+</template>
+
+
+
+</polymer-element>
+<script src="core-animated-pages-extracted.js"></script>