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paper-collapse-item.js
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paper-collapse-item.js
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import { html, PolymerElement } from '@polymer/polymer/polymer-element.js';
import '@polymer/iron-icon/iron-icon.js';
import '@polymer/iron-icons/iron-icons.js';
import '@polymer/iron-collapse/iron-collapse.js';
import '@polymer/paper-icon-button/paper-icon-button.js';
import '@polymer/paper-item/paper-item.js';
import '@polymer/paper-item/paper-item-body.js';
import '@polymer/paper-styles/paper-styles.js';
import './simple-paper-item.js';
/**
* `PaperCollapseItem`
*
* A Material Design [item with header and collapsible content](https://www.google.com/design/spec/components/lists.html)
*
* ### Example
*
* ```html
* <paper-collapse-item icon="icons:favorite" header="Item 1" opened>
* Lots of very interesting content.
* </paper-collapse-item>
* <paper-collapse-item icon="icons:info" header="Item 2">
* Lots of very interesting content.
* </paper-collapse-item>
* <paper-collapse-item icon="icons:help" header="Item 3">
* Lots of very interesting content.
* </paper-collapse-item>
* ```
* ### Styling
*
* The following custom properties and mixins are available for styling:
* Custom property | Description | Default
* ----------------|-------------|----------
* --paper-collapse-item-header|Mixin applied to header of collapsible item|{}
* --paper-collapse-item-content|Mixin applied to collapsible content|{}
* --paper-collapse-item-icon|Mixin applied to icon|{}
* --paper-collapse-simple-paper-item-styles|Mixin applied to simple-paper-item|{}
*
* @customElement
* @polymer
* @demo demo/index.html
*/
class PaperCollapseItem extends PolymerElement {
static get template() {
return html`
<style>
.header {
min-height: 48px;
color: var(--primary-text-color);
@apply --layout-horizontal;
@apply --layout-center;
@apply --paper-font-subhead;
@apply --paper-collapse-item-header;
}
.icon {
margin-right: 24px;
--iron-icon-height: 32px;
--iron-icon-width: 32px;
@apply --paper-collapse-item-icon;
}
.icon, .toogle {
color: var(--disabled-text-color);
}
.html {
@apply --layout-flex;
}
.content {
color: var(--primary-text-color);
@apply --paper-font-body1;
@apply --paper-collapse-item-content;
}
simple-paper-item {
@apply --paper-collapse-simple-paper-item-styles;
}
</style>
<simple-paper-item>
<paper-item-body>
<div class="header" on-tap="_toggleOpened">
<template is="dom-if" if="[[_or(icon, src)]]">
<iron-icon class="icon" src="[[src]]" icon="[[icon]]"></iron-icon>
</template>
<template is="dom-if" if="[[header]]">
<div class="html" inner-h-t-m-l="[[header]]"></div>
</template>
<slot class="html" name="header"></slot>
<paper-icon-button class="toggle" icon="[[_toggleIcon]]"></paper-icon-button>
</div>
<iron-collapse class="content" opened="{{opened}}">
<slot></slot>
</iron-collapse>
</paper-item-body>
</simple-paper-item>
`;
}
static get properties() {
return {
/**
* Text in the header row
*/
header: String,
/**
* The name of the icon to use. The name should be of the
* form: iconset_name:icon_name.
*/
icon: String,
/**
* If using paper-collapse-item without an iconset, you can set the
* src to be the URL of an individual icon image file. Note that
* this will take precedence over a given icon attribute.
*/
src: String,
/**
* True if the content section is opened
*/
opened: {
type: Boolean,
reflectToAttribute: true,
notify: true
},
_toggleIcon: {
type: String,
computed: '_computeToggleIcon(opened)'
}
};
}
/**
* Fired whenever the status is changed (opened/closed)
*
* @event toggle
*/
_toggleOpened(e) {
this.opened = !this.opened;
const toggleEvent = new CustomEvent('toggle', {
detail: this,
bubbles: true,
composed: true,
});
this.dispatchEvent(toggleEvent);
}
_computeToggleIcon(opened) {
return opened ? 'icons:expand-less' : 'icons:expand-more';
}
_or(value1, value2) {
return value1 || value2;
}
}
window.customElements.define('paper-collapse-item', PaperCollapseItem);