Polymer elements added to third_party/polymer.

third_party/polymer/components/core-animated-pages/transitions/hero-transition.html

+<!--
+Copyright (c) 2014 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 href="core-transition-pages.html" rel="import">
+
+<core-style id="hero-transition">
+  /* Hide heroes that are not currently transitioning */
+  polyfill-next-selector { content: ':host > [animate]:not(.core-selected) [hero]'; }
+  ::content > [animate]:not(.core-selected) /deep/ [hero] {
+    opacity: 0;
+  }
+
+  polyfill-next-selector { content: ':host > .core-selected[animate] [hero]'; }
+  ::content > .core-selected[animate] /deep/ [hero] {
+    opacity: 1;
+    z-index: 10000;
+  }
+
+  polyfill-next-selector { content: ':host > * [hero-p]'; }
+  ::content > * /deep/ [hero-p] {
+    -webkit-transition: box-shadow 100ms ease-out;
+    transition: box-shadow 100ms ease-out;
+  }
+
+  polyfill-next-selector { content: ':host > [animate] [hero-p]'; }
+  ::content > [animate] /deep/ [hero-p] {
+    box-shadow: none !important;
+  }
+</core-style>
+
+
+<!--
+
+`hero-transition` transforms two elements in different pages such that they appear
+to be shared across the pages.
+
+Example:
+
+    <core-animated-pages transition="hero-transition">
+      <section layout horizontal>
+        <div id="div1" flex></div>
+        <div id="div2" flex hero-id="shared" hero></div>
+      </section>
+      <section>
+      <section layout horizontal>
+        <div id="div3" flex hero-id="shared" hero></div>
+        <div id="div4" flex></div>
+      </section>
+      </section>
+    </core-animated-pages>
+
+In the above example, the elements `#div2` and `#div3` shares the same `hero-id`
+attribute and a single element appears to translate and scale smoothly between
+the two positions during a page transition.
+
+Both elements from the source and destination pages must share the same `hero-id`
+and must both contain the `hero` attribute to trigger the transition. The separate
+`hero` attribute allows you to use binding to configure the transition:
+
+Example:
+
+    <core-animated-pages transition="hero-transition">
+      <section layout horizontal>
+        <div id="div1" flex hero-id="shared" hero?="{{selected == 0}}"></div>
+        <div id="div2" flex hero-id="shared" hero?="{{selected == 1}}"></div>
+      </section>
+      <section>
+      <section layout horizontal>
+        <div id="div3" flex hero-id="shared" hero></div>
+      </section>
+      </section>
+    </core-animated-pages>
+
+In the above example, either `#div1` or `#div2` scales to `#div3` during a page transition,
+depending on the value of `selected`.
+
+Because it is common to share elements with different `border-radius` values, by default
+this transition will also animate the `border-radius` property.
+
+You can configure the duration of the hero transition with the global variable
+`CoreStyle.g.transitions.heroDuration`.
+
+@class hero-transition
+@extends core-transition-pages
+@status beta
+@homepage github.io
+-->
+<polymer-element name="hero-transition" extends="core-transition-pages">
+<script>
+(function() {
+
+  var webkitStyles = '-webkit-transition' in document.documentElement.style
+  var TRANSITION_CSSNAME = webkitStyles ? '-webkit-transition' : 'transition';
+  var TRANSFORM_CSSNAME = webkitStyles ? '-webkit-transform' : 'transform';
+  var TRANSITION_NAME = webkitStyles ? 'webkitTransition' : 'transition';
+  var TRANSFORM_NAME = webkitStyles ? 'webkitTransform' : 'transform';
+
+  var hasShadowDOMPolyfill = window.ShadowDOMPolyfill;
+
+  Polymer({
+
+    go: function(scope, options) {
+      var props = [
+        'border-radius',
+        'width',
+        'height',
+        TRANSFORM_CSSNAME
+      ];
+
+      var duration = options && options.duration || 
+          (CoreStyle.g.transitions.heroDuration || 
+          CoreStyle.g.transitions.duration);
+
+      scope._heroes.forEach(function(h) {
+        var d = h.h0.hasAttribute('hero-delayed') ? CoreStyle.g.transitions.heroDelay : '';
+        var wt = [];
+        props.forEach(function(p) {
+          wt.push(p + ' ' + duration + ' ' + options.easing + ' ' + d);
+        });
+
+        h.h1.style[TRANSITION_NAME] = wt.join(', ');
+        h.h1.style.borderRadius = h.r1;
+        h.h1.style[TRANSFORM_NAME] = 'none';
+      });
+
+      this.super(arguments);
+
+      if (!scope._heroes.length) {
+        this.completed = true;
+      }
+    },
+
+    prepare: function(scope, options) {
+      this.super(arguments);
+      var src = options.src, dst = options.dst;
+
+      if (scope._heroes && scope._heroes.length) {
+        this.ensureComplete(scope);
+      } else {
+        scope._heroes = [];
+      }
+
+      // FIXME(yvonne): basic support for nested pages.
+      // Look for heroes in the light DOM and one level of shadow DOM of the src and dst,
+      // and also in src.selectedItem or dst.selectedItem, then transform the dst hero to src
+      var ss = '[hero]';
+      var h$ = this.findAllInShadows(src, ss);
+      if (src.selectedItem) {
+        hs$ = this.findAllInShadows(src.selectedItem, ss);
+        hsa$ = [];
+        // De-duplicate items
+        Array.prototype.forEach.call(hs$, function(hs) {
+          if (h$.indexOf(hs) === -1) {
+            hsa$.push(hs);
+          }
+        })
+        h$ = h$.concat(hsa$);
+      }
+
+      for (var i=0, h0; h0=h$[i]; i++) {
+        var v = h0.getAttribute('hero-id');
+        var ds = '[hero][hero-id="' + v + '"]';
+        var h1 = this.findInShadows(dst, ds);
+
+        if (!h1 && dst.selectedItem) {
+          h1 = this.findInShadows(dst.selectedItem, ds);
+        }
+
+        // console.log('src', src);
+        // console.log('dst', dst, dst.selectedItem);
+        // console.log(v, h0, h1);
+        if (v && h1) {
+          var c0 = getComputedStyle(h0);
+          var c1 = getComputedStyle(h1);
+          var h = {
+            h0: h0,
+            b0: h0.getBoundingClientRect(),
+            r0: c0.borderRadius,
+            h1: h1,
+            b1: h1.getBoundingClientRect(),
+            r1: c1.borderRadius
+          };
+
+          var dl = h.b0.left - h.b1.left;
+          var dt = h.b0.top - h.b1.top;
+          var sw = h.b0.width / h.b1.width;
+          var sh = h.b0.height / h.b1.height;
+
+          // h.scaley = h.h0.hasAttribute('scaley');
+          // if (!h.scaley && (sw !== 1 || sh !== 1)) {
+          //   sw = sh = 1;
+          //   h.h1.style.width = h.b0.width + 'px';
+          //   h.h1.style.height = h.b0.height + 'px';
+          // }
+
+          // Also animate the border-radius for the circle-to-square transition
+          if (h.r0 !== h.r1) {
+            h.h1.style.borderRadius = h.r0;
+          }
+
+          // console.log(h);
+
+          h.h1.style[TRANSFORM_NAME] = 'translate(' + dl + 'px,' + dt + 'px)' + ' scale(' + sw + ',' + sh + ')';
+          h.h1.style[TRANSFORM_NAME + 'Origin'] = '0 0';
+
+          scope._heroes.push(h);
+        }
+      }
+
+    },
+
+    // carefully look into ::shadow with polyfill specific hack
+    findInShadows: function(node, selector) {
+      return node.querySelector(selector) || (hasShadowDOMPolyfill ? 
+          Platform.queryAllShadows(node, selector) :
+          node.querySelector('::shadow ' + selector));
+    },
+
+    findAllInShadows: function(node, selector) {
+      if (hasShadowDOMPolyfill) {
+        var nodes = node.querySelectorAll(selector).array();
+        var shadowNodes = Platform.queryAllShadows(node, selector, true);
+        return nodes.concat(shadowNodes);
+      } else {
+        return node.querySelectorAll(selector).array().concat(node.shadowRoot ? node.shadowRoot.querySelectorAll(selector).array() : []);
+      }
+    },
+
+    ensureComplete: function(scope) {
+      this.super(arguments);
+      if (scope._heroes) {
+        scope._heroes.forEach(function(h) {
+          h.h1.style[TRANSITION_NAME] = null;
+          h.h1.style[TRANSFORM_NAME] = null;
+        });
+        scope._heroes = [];
+      }
+    },
+
+    complete: function(scope, e) {
+      // if (e.propertyName === TRANSFORM_CSSNAME) {
+        var done = false;
+        scope._heroes.forEach(function(h) {
+          if (h.h1 === e.path[0]) {
+            done = true;
+          }
+        });
+
+        if (done) {
+          this.super(arguments);
+        }
+      // }
+    }
+
+  });
+
+})();
+</script>
+</polymer-element>
+
+<hero-transition id="hero-transition"></hero-transition>