Index: third_party/polymer/v0_8/components-chromium/iron-image/iron-image.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 |
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt |
+--><html><head><link rel="import" href="../polymer/polymer.html"> |
+<link rel="import" href="../iron-flex-layout/classes/iron-flex-layout.html"> |
+ |
+<!-- |
+`iron-image` is an element for displaying an image that provides useful sizing and |
+preloading options not found on the standard `<img>` tag. |
+ |
+The `sizing` option allows the image to be either cropped (`cover`) or |
+letterboxed (`contain`) to fill a fixed user-size placed on the element. |
+ |
+The `preload` option prevents the browser from rendering the image until the |
+image is fully loaded. In the interim, either the element's CSS `background-color` |
+can be be used as the placeholder, or the `placeholder` property can be |
+set to a URL (preferably a data-URI, for instant rendering) for an |
+placeholder image. |
+ |
+The `fade` option (only valid when `preload` is set) will cause the placeholder |
+image/color to be faded out once the image is rendered. |
+ |
+Examples: |
+ |
+ Basically identical to <img src="..."> tag: |
+ |
+ <iron-image src="http://lorempixel.com/400/400"></iron-image> |
+ |
+ Will letterbox the image to fit: |
+ |
+ <iron-image style="width:400px; height:400px;" sizing="contain" |
+ src="http://lorempixel.com/600/400"></iron-image> |
+ |
+ Will crop the image to fit: |
+ |
+ <iron-image style="width:400px; height:400px;" sizing="cover" |
+ src="http://lorempixel.com/600/400"></iron-image> |
+ |
+ Will show light-gray background until the image loads: |
+ |
+ <iron-image style="width:400px; height:400px; background-color: lightgray;" |
+ sizing="cover" preload src="http://lorempixel.com/600/400"></iron-image> |
+ |
+ Will show a base-64 encoded placeholder image until the image loads: |
+ |
+ <iron-image style="width:400px; height:400px;" placeholder="data:image/gif;base64,..." |
+ sizing="cover" preload src="http://lorempixel.com/600/400"></iron-image> |
+ |
+ Will fade the light-gray background out once the image is loaded: |
+ |
+ <iron-image style="width:400px; height:400px; background-color: lightgray;" |
+ sizing="cover" preload fade src="http://lorempixel.com/600/400"></iron-image> |
+ |
+ |
+@group Iron Elements |
+@element iron-image |
+@demo demo/index.html |
+--> |
+ |
+</head><body><dom-module id="iron-image"> |
+ |
+ <style> |
+ |
+ :host { |
+ display: inline-block; |
+ overflow: hidden; |
+ position: relative; |
+ } |
+ |
+ :host([sizing]) #img { |
+ display: none; |
+ } |
+ |
+ #placeholder { |
+ background-color: inherit; |
+ opacity: 1; |
+ } |
+ |
+ #placeholder.faded-out { |
+ transition: opacity 0.5s linear; |
+ opacity: 0; |
+ } |
+ |
+ </style> |
+ |
+ <template> |
+ |
+ <img id="img" role="none" hidden$="[[_computeImageVisibility(sizing)]]"> |
+ <div id="placeholder" hidden$="[[_computePlaceholderVisibility(fade,loaded,preload)]]" class$="[[_computePlaceholderClassName(fade,loaded,preload)]]"></div> |
+ <content></content> |
+ |
+ </template> |
+ |
+</dom-module> |
+ |
+<script src="iron-image-extracted.js"></script></body></html> |