<!– @license Copyright © 2015 The Polymer Project Authors. All rights reserved. This code may only be used under the BSD style license found at polymer.github.io/LICENSE.txt The complete set of authors may be found at polymer.github.io/AUTHORS.txt The complete set of contributors may be found at 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 polymer.github.io/PATENTS.txt –>
<link rel=“import” href=“../polymer/polymer.html”> <link rel=“import” href=“../iron-flex-layout/iron-flex-layout.html”> <link rel=“import” href=“../iron-image/iron-image.html”> <link rel=“import” href=“../paper-material/paper-material.html”> <link rel=“import” href=“../paper-styles/default-theme.html”>
<!– Material design: [Cards](www.google.com/design/spec/components/cards.html)
`paper-card` is a container with a drop shadow.
Example:
<paper-card heading="Card Title"> <div class="card-content">Some content</div> <div class="card-actions"> <paper-button>Some action</paper-button> </div> </paper-card>
Example - top card image:
<paper-card heading="Card Title" image="/path/to/image.png" alt="image"> ... </paper-card>
### Accessibility
By default, the `aria-label` will be set to the value of the `heading` attribute.
### Styling
The following custom properties and mixins are available for styling:
Custom property | Description | Default —————-|————-|———- `–paper-card-background-color` | The background color of the card | `–primary-background-color` `–paper-card-header-color` | The color of the header text | `#000` `–paper-card-header` | Mixin applied to the card header section | `{}` `–paper-card-header-text` | Mixin applied to the title in the card header section | `{}` `–paper-card-header-image` | Mixin applied to the image in the card header section | `{}` `–paper-card-header-image-text` | Mixin applied to the text overlapping the image in the card header section | `{}` `–paper-card-content` | Mixin applied to the card content section| `{}` `–paper-card-actions` | Mixin applied to the card action section | `{}` `–paper-card` | Mixin applied to the card | `{}`
@group Paper Elements @element paper-card @demo demo/index.html –>
<dom-module id=“paper-card”>
<template> <style include="paper-material"> :host { display: inline-block; position: relative; box-sizing: border-box; background-color: var(--paper-card-background-color, --primary-background-color); border-radius: 2px; @apply(--paper-font-common-base); @apply(--paper-card); } /* IE 10 support for HTML5 hidden attr */ [hidden] { display: none !important; } .header { position: relative; border-top-left-radius: inherit; border-top-right-radius: inherit; overflow: hidden; @apply(--paper-card-header); } .header iron-image { display: block; width: 100%; --iron-image-width: 100%; pointer-events: none; @apply(--paper-card-header-image); } .header .title-text { padding: 16px; font-size: 24px; font-weight: 400; color: var(--paper-card-header-color, #000); @apply(--paper-card-header-text); } .header .title-text.over-image { position: absolute; bottom: 0px; @apply(--paper-card-header-image-text); } :host ::content .card-content { padding: 16px; position:relative; @apply(--paper-card-content); } :host ::content .card-actions { border-top: 1px solid #e8e8e8; padding: 5px 16px; position:relative; @apply(--paper-card-actions); } </style> <div class="header"> <iron-image hidden$="[[!image]]" aria-hidden$="[[_isHidden(image)]]" src="[[image]]" alt="[[alt]]" placeholder="[[placeholderImage]]" preload="[[preloadImage]]" fade="[[fadeImage]]"></iron-image> <div hidden$="[[!heading]]" class$="title-text [[_computeHeadingClass(image)]]">[[heading]]</div> </div> <content></content> </template> <script> Polymer({ is: 'paper-card', properties: { /** * The title of the card. */ heading: { type: String, value: '', observer: '_headingChanged' }, /** * The url of the title image of the card. */ image: { type: String, value: '' }, /** * The text alternative of the card's title image. */ alt: { type: String }, /** * When `true`, any change to the image url property will cause the * `placeholder` image to be shown until the image is fully rendered. */ preloadImage: { type: Boolean, value: false }, /** * When `preloadImage` is true, setting `fadeImage` to true will cause the * image to fade into place. */ fadeImage: { type: Boolean, value: 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. */ placeholderImage: { type: String, value: null }, /** * The z-depth of the card, from 0-5. */ elevation: { type: Number, value: 1, reflectToAttribute: true }, /** * Set this to true to animate the card shadow when setting a new * `z` value. */ animatedShadow: { type: Boolean, value: false }, /** * Read-only property used to pass down the `animatedShadow` value to * the underlying paper-material style (since they have different names). */ animated: { type: Boolean, reflectToAttribute: true, readOnly: true, computed: '_computeAnimated(animatedShadow)' } }, /** * Format function for aria-hidden. Use the ! operator results in the * empty string when given a falsy value. */ _isHidden: function(image) { return image ? 'false' : 'true'; }, _headingChanged: function(heading) { var label = this.getAttribute('aria-label'); this.setAttribute('aria-label', heading); }, _computeHeadingClass: function(image) { return image ? ' over-image' : ''; }, _computeAnimated: function(animatedShadow) { return animatedShadow; } }); </script>
</dom-module>