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vaadin-demo-shadow-dom-renderer.html
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vaadin-demo-shadow-dom-renderer.html
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<link rel="import" href="../polymer/polymer-element.html">
<link rel="import" href="vaadin-light-dom-helper.html">
<dom-module id="vaadin-demo-shadow-dom-renderer">
<template>
<style>
:host {
display: block;
padding: 1.5em;
}
</style>
</template>
<script>
(()=>{
'use strict';
let instanceIndex = 0;
class VaadinDemoShadowDomRenderer extends Polymer.Element {
static get is() {
return 'vaadin-demo-shadow-dom-renderer';
}
static get properties() {
return {
id: {
type: String,
value: () => {
return `vaadin-demo-shadow-dom-${instanceIndex++}`;
}
},
};
}
ready() {
super.ready();
Vaadin.LightDomHelper.querySelectorAsync('slot', this)
.then(slot => {
return Vaadin.LightDomHelper.querySlotContentAsync('template', slot)
})
.then(template => {
this._showDemo(template);
})
.catch(error => {
throw new Error('vaadin-demo-iframe-renderer requires a <template> child');
});
}
_showDemo(template) {
window.ShadyCSS.prepareTemplate(template, this.id);
let dom = this.getRootNode().host._stampTemplate(template);
this.shadowRoot.appendChild(dom);
}
}
customElements.define(VaadinDemoShadowDomRenderer.is, VaadinDemoShadowDomRenderer);
})();
</script>
</dom-module>