Index: third_party/polymer/components/core-image/core-image.html |
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-<!-- |
-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 |
---> |
- |
-<!-- |
-`core-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: |
- |
- <core-image src="http://lorempixel.com/400/400"></core-image> |
- |
- Will letterbox the image to fit: |
- |
- <core-image style="width:400px; height:400px;" sizing="contain" |
- src="http://lorempixel.com/600/400"></core-image> |
- |
- Will crop the image to fit: |
- |
- <core-image style="width:400px; height:400px;" sizing="cover" |
- src="http://lorempixel.com/600/400"></core-image> |
- |
- Will show light-gray background until the image loads: |
- |
- <core-image style="width:400px; height:400px; background-color: lightgray;" |
- sizing="cover" preload src="http://lorempixel.com/600/400"></core-image> |
- |
- Will show a base-64 encoded placeholder image until the image loads: |
- |
- <core-image style="width:400px; height:400px;" placeholder="data:image/gif;base64,..." |
- sizing="cover" preload src="http://lorempixel.com/600/400"></core-image> |
- |
- Will fade the light-gray background out once the image is loaded: |
- |
- <core-image style="width:400px; height:400px; background-color: lightgray;" |
- sizing="cover" preload fade src="http://lorempixel.com/600/400"></core-image> |
- |
- |
-@group Polymer Core Elements |
-@element core-image |
-@homepage github.io |
---> |
- |
-<link rel="import" href="../polymer/polymer.html"> |
- |
-<polymer-element name="core-image"> |
-<template> |
- <link rel="stylesheet" href="core-image.css"> |
- <template if="{{!sizing}}"> |
- <img id="img"> |
- </template> |
- <template if="{{preload && fade}}"> |
- <div id="placeholder" fit></div> |
- </template> |
- <content></content> |
-</template> |
-<script> |
- |
- Polymer({ |
- |
- publish: { |
- |
- /** |
- * The URL of an image. |
- * |
- * @attribute src |
- * @type string |
- * @default null |
- */ |
- src: null, |
- |
- /** |
- * When false, the image is prevented from loading and any placeholder is |
- * shown. This may be useful when a binding to the src property is known to |
- * be invalid, to prevent 404 requests. |
- * |
- * @attribute src |
- * @type string |
- * @default null |
- */ |
- load: true, |
- |
- /** |
- * Sets a sizing option for the image. Valid values are `contain` (full |
- * aspect ratio of the image is contained within the element and |
- * letterboxed) or `cover` (image is cropped in order to fully cover the |
- * bounds of the element), or `null` (default: image takes natural size). |
- * |
- * @attribute sizing |
- * @type string |
- * @default null |
- */ |
- sizing: null, |
- |
- /** |
- * When a sizing option is uzed (`cover` or `contain`), this determines |
- * how the image is aligned within the element bounds. |
- * |
- * @attribute position |
- * @type string |
- * @default 'center' |
- */ |
- position: 'center', |
- |
- /** |
- * When `true`, any change to the `src` property will cause the `placeholder` |
- * image to be shown until the |
- * |
- * @attribute preload |
- * @type boolean |
- * @default false |
- */ |
- preload: false, |
- |
- /** |
- * This image will be used as a background/placeholder until the src image has |
- * loaded. Use of a data-URI for placeholder is encouraged for instant rendering. |
- * |
- * @attribute placeholder |
- * @type string |
- * @default null |
- */ |
- placeholder: null, |
- |
- /** |
- * When `preload` is true, setting `fade` to true will cause the image to |
- * fade into place. |
- * |
- * @attribute fade |
- * @type boolean |
- * @default false |
- */ |
- fade: false, |
- |
- /** |
- * Read-only value that tracks the loading state of the image when the `preload` |
- * option is used. |
- * |
- * @attribute loading |
- * @type boolean |
- * @default false |
- */ |
- loading: false, |
- |
- /** |
- * Can be used to set the width of image (e.g. via binding); size may also be |
- * set via CSS. |
- * |
- * @attribute width |
- * @type number |
- * @default null |
- */ |
- width: null, |
- |
- /** |
- * Can be used to set the height of image (e.g. via binding); size may also be |
- * set via CSS. |
- * |
- * @attribute height |
- * @type number |
- * @default null |
- */ |
- height: null |
- |
- }, |
- |
- observe: { |
- 'preload color sizing position src fade': 'update' |
- }, |
- |
- widthChanged: function() { |
- this.style.width = isNaN(this.width) ? this.width : this.width + 'px'; |
- }, |
- |
- heightChanged: function() { |
- this.style.height = isNaN(this.height) ? this.height : this.height + 'px'; |
- }, |
- |
- update: function() { |
- this.style.backgroundSize = this.sizing; |
- this.style.backgroundPosition = this.sizing ? this.position : null; |
- this.style.backgroundRepeat = this.sizing ? 'no-repeat' : null; |
- if (this.preload) { |
- if (this.fade) { |
- if (!this._placeholderEl) { |
- this._placeholderEl = this.shadowRoot.querySelector('#placeholder'); |
- } |
- this._placeholderEl.style.backgroundSize = this.sizing; |
- this._placeholderEl.style.backgroundPosition = this.sizing ? this.position : null; |
- this._placeholderEl.style.backgroundRepeat = this.sizing ? 'no-repeat' : null; |
- this._placeholderEl.classList.remove('fadein'); |
- this._placeholderEl.style.backgroundImage = (this.load && this.placeholder) ? 'url(' + this.placeholder + ')': null; |
- } else { |
- this._setSrc(this.placeholder); |
- } |
- if (this.load && this.src) { |
- var img = new Image(); |
- img.src = this.src; |
- this.loading = true; |
- img.onload = function() { |
- this._setSrc(this.src); |
- this.loading = false; |
- if (this.fade) { |
- this._placeholderEl.classList.add('fadein'); |
- } |
- }.bind(this); |
- } |
- } else { |
- this._setSrc(this.src); |
- } |
- }, |
- |
- _setSrc: function(src) { |
- if (this.sizing) { |
- this.style.backgroundImage = src ? 'url(' + src + ')': ''; |
- } else { |
- this.$.img.src = src || ''; |
- } |
- } |
- |
- }); |
- |
-</script> |
-</polymer-element> |